add working USGS earthquake plugin

closes #1348

.gitattributes

@@ -0,0 +1,4 @@
+CHANGELOG.md merge=union
+README.md merge=union
+plugins/inputs/all/all.go merge=union
+plugins/outputs/all/all.go merge=union

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,44 @@
+## Directions
+
+GitHub Issues are reserved for actionable bug reports and feature requests.
+General questions should be sent to the [InfluxDB mailing list](https://groups.google.com/forum/#!forum/influxdb).
+
+Before opening an issue, search for similar bug reports or feature requests on GitHub Issues.
+If no similar issue can be found, fill out either the "Bug Report" or the "Feature Request" section below.
+Erase the other section and everything on and above this line.
+
+*Please note, the quickest way to fix a bug is to open a Pull Request.*
+
+## Bug report
+
+### Relevant telegraf.conf:
+
+### System info:
+
+[Include Telegraf version, operating system name, and other relevant details]
+
+### Steps to reproduce:
+
+1. ...
+2. ...
+
+### Expected behavior:
+
+### Actual behavior:
+
+### Additional info:
+
+[Include gist of relevant config, logs, etc.]
+
+
+## Feature Request
+
+Opening a feature request kicks off a discussion.
+
+### Proposal:
+
+### Current behavior:
+
+### Desired behavior:
+
+### Use case: [Why is this important (helps with prioritizing requests)]

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,5 @@
+### Required for all PRs:
+
+- [ ] CHANGELOG.md updated (we recommend not updating this until the PR has been approved by a maintainer)
+- [ ] Sign [CLA](https://influxdata.com/community/cla/) (if not already signed)
+- [ ] README.md updated (if adding a new plugin)

.gitignore

@@ -1,3 +1,7 @@
-pkg/
+build
 tivan
 .vagrant
+/telegraf
+.idea
+*~
+*#

CONTRIBUTING.md

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+## Steps for Contributing:
+
+1. [Sign the CLA](http://influxdb.com/community/cla.html)
+1. Make changes or write plugin (see below for details)
+1. Add your plugin to one of: `plugins/{inputs,outputs,aggregators,processors}/all/all.go`
+1. If your plugin requires a new Go package,
+[add it](https://github.com/influxdata/telegraf/blob/master/CONTRIBUTING.md#adding-a-dependency)
+1. Write a README for your plugin, if it's an input plugin, it should be structured
+like the [input example here](https://github.com/influxdata/telegraf/blob/master/plugins/inputs/EXAMPLE_README.md).
+Output plugins READMEs are less structured,
+but any information you can provide on how the data will look is appreciated.
+See the [OpenTSDB output](https://github.com/influxdata/telegraf/tree/master/plugins/outputs/opentsdb)
+for a good example.
+1. **Optional:** Help users of your plugin by including example queries for populating dashboards. Include these sample queries in the `README.md` for the plugin.
+1. **Optional:** Write a [tickscript](https://docs.influxdata.com/kapacitor/v1.0/tick/syntax/) for your plugin and add it to [Kapacitor](https://github.com/influxdata/kapacitor/tree/master/examples/telegraf). Or mention @jackzampolin in a PR comment with some common queries that you would want to alert on and he will write one for you.
+
+## GoDoc
+
+Public interfaces for inputs, outputs, processors, aggregators, metrics,
+and the accumulator can be found on the GoDoc
+
+[![GoDoc](https://godoc.org/github.com/influxdata/telegraf?status.svg)](https://godoc.org/github.com/influxdata/telegraf)
+
+## Sign the CLA
+
+Before we can merge a pull request, you will need to sign the CLA,
+which can be found [on our website](http://influxdb.com/community/cla.html)
+
+## Adding a dependency
+
+Assuming you can already build the project, run these in the telegraf directory:
+
+1. `go get github.com/sparrc/gdm`
+1. `gdm restore`
+1. `GOOS=linux gdm save`
+
+## Input Plugins
+
+This section is for developers who want to create new collection inputs.
+Telegraf is entirely plugin driven. This interface allows for operators to
+pick and chose what is gathered and makes it easy for developers
+to create new ways of generating metrics.
+
+Plugin authorship is kept as simple as possible to promote people to develop
+and submit new inputs.
+
+### Input Plugin Guidelines
+
+* A plugin must conform to the [`telegraf.Input`](https://godoc.org/github.com/influxdata/telegraf#Input) interface.
+* Input Plugins should call `inputs.Add` in their `init` function to register themselves.
+See below for a quick example.
+* Input Plugins must be added to the
+`github.com/influxdata/telegraf/plugins/inputs/all/all.go` file.
+* The `SampleConfig` function should return valid toml that describes how the
+plugin can be configured. This is include in `telegraf -sample-config`.
+* The `Description` function should say in one line what this plugin does.
+
+Let's say you've written a plugin that emits metrics about processes on the
+current host.
+
+### Input Plugin Example
+
+```go
+package simple
+
+// simple.go
+
+import (
+    "github.com/influxdata/telegraf"
+    "github.com/influxdata/telegraf/plugins/inputs"
+)
+
+type Simple struct {
+    Ok bool
+}
+
+func (s *Simple) Description() string {
+    return "a demo plugin"
+}
+
+func (s *Simple) SampleConfig() string {
+    return "ok = true # indicate if everything is fine"
+}
+
+func (s *Simple) Gather(acc telegraf.Accumulator) error {
+    if s.Ok {
+        acc.AddFields("state", map[string]interface{}{"value": "pretty good"}, nil)
+    } else {
+        acc.AddFields("state", map[string]interface{}{"value": "not great"}, nil)
+    }
+
+    return nil
+}
+
+func init() {
+    inputs.Add("simple", func() telegraf.Input { return &Simple{} })
+}
+```
+
+## Adding Typed Metrics
+
+In addition the the `AddFields` function, the accumulator also supports an
+`AddGauge` and `AddCounter` function. These functions are for adding _typed_
+metrics. Metric types are ignored for the InfluxDB output, but can be used
+for other outputs, such as [prometheus](https://prometheus.io/docs/concepts/metric_types/).
+
+## Input Plugins Accepting Arbitrary Data Formats
+
+Some input plugins (such as
+[exec](https://github.com/influxdata/telegraf/tree/master/plugins/inputs/exec))
+accept arbitrary input data formats. An overview of these data formats can
+be found
+[here](https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md).
+
+In order to enable this, you must specify a `SetParser(parser parsers.Parser)`
+function on the plugin object (see the exec plugin for an example), as well as
+defining `parser` as a field of the object.
+
+You can then utilize the parser internally in your plugin, parsing data as you
+see fit. Telegraf's configuration layer will take care of instantiating and
+creating the `Parser` object.
+
+You should also add the following to your SampleConfig() return:
+
+```toml
+  ## Data format to consume.
+  ## Each data format has it's own unique set of configuration options, read
+  ## more about them here:
+  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
+  data_format = "influx"
+```
+
+Below is the `Parser` interface.
+
+```go
+// Parser is an interface defining functions that a parser plugin must satisfy.
+type Parser interface {
+    // Parse takes a byte buffer separated by newlines
+    // ie, `cpu.usage.idle 90\ncpu.usage.busy 10`
+    // and parses it into telegraf metrics
+    Parse(buf []byte) ([]telegraf.Metric, error)
+
+    // ParseLine takes a single string metric
+    // ie, "cpu.usage.idle 90"
+    // and parses it into a telegraf metric.
+    ParseLine(line string) (telegraf.Metric, error)
+}
+```
+
+And you can view the code
+[here.](https://github.com/influxdata/telegraf/blob/henrypfhu-master/plugins/parsers/registry.go)
+
+## Service Input Plugins
+
+This section is for developers who want to create new "service" collection
+inputs. A service plugin differs from a regular plugin in that it operates
+a background service while Telegraf is running. One example would be the `statsd`
+plugin, which operates a statsd server.
+
+Service Input Plugins are substantially more complicated than a regular plugin, as they
+will require threads and locks to verify data integrity. Service Input Plugins should
+be avoided unless there is no way to create their behavior with a regular plugin.
+
+Their interface is quite similar to a regular plugin, with the addition of `Start()`
+and `Stop()` methods.
+
+### Service Plugin Guidelines
+
+* Same as the `Plugin` guidelines, except that they must conform to the
+`inputs.ServiceInput` interface.
+
+## Output Plugins
+
+This section is for developers who want to create a new output sink. Outputs
+are created in a similar manner as collection plugins, and their interface has
+similar constructs.
+
+### Output Plugin Guidelines
+
+* An output must conform to the [`telegraf.Output`](https://godoc.org/github.com/influxdata/telegraf#Output) interface.
+* Outputs should call `outputs.Add` in their `init` function to register themselves.
+See below for a quick example.
+* To be available within Telegraf itself, plugins must add themselves to the
+`github.com/influxdata/telegraf/plugins/outputs/all/all.go` file.
+* The `SampleConfig` function should return valid toml that describes how the
+output can be configured. This is include in `telegraf -sample-config`.
+* The `Description` function should say in one line what this output does.
+
+### Output Example
+
+```go
+package simpleoutput
+
+// simpleoutput.go
+
+import (
+    "github.com/influxdata/telegraf"
+    "github.com/influxdata/telegraf/plugins/outputs"
+)
+
+type Simple struct {
+    Ok bool
+}
+
+func (s *Simple) Description() string {
+    return "a demo output"
+}
+
+func (s *Simple) SampleConfig() string {
+    return "url = localhost"
+}
+
+func (s *Simple) Connect() error {
+    // Make a connection to the URL here
+    return nil
+}
+
+func (s *Simple) Close() error {
+    // Close connection to the URL here
+    return nil
+}
+
+func (s *Simple) Write(metrics []telegraf.Metric) error {
+    for _, metric := range metrics {
+        // write `metric` to the output sink here
+    }
+    return nil
+}
+
+func init() {
+    outputs.Add("simpleoutput", func() telegraf.Output { return &Simple{} })
+}
+
+```
+
+## Output Plugins Writing Arbitrary Data Formats
+
+Some output plugins (such as
+[file](https://github.com/influxdata/telegraf/tree/master/plugins/outputs/file))
+can write arbitrary output data formats. An overview of these data formats can
+be found
+[here](https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md).
+
+In order to enable this, you must specify a
+`SetSerializer(serializer serializers.Serializer)`
+function on the plugin object (see the file plugin for an example), as well as
+defining `serializer` as a field of the object.
+
+You can then utilize the serializer internally in your plugin, serializing data
+before it's written. Telegraf's configuration layer will take care of
+instantiating and creating the `Serializer` object.
+
+You should also add the following to your SampleConfig() return:
+
+```toml
+  ## Data format to output.
+  ## Each data format has it's own unique set of configuration options, read
+  ## more about them here:
+  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md
+  data_format = "influx"
+```
+
+## Service Output Plugins
+
+This section is for developers who want to create new "service" output. A
+service output differs from a regular output in that it operates a background service
+while Telegraf is running. One example would be the `prometheus_client` output,
+which operates an HTTP server.
+
+Their interface is quite similar to a regular output, with the addition of `Start()`
+and `Stop()` methods.
+
+### Service Output Guidelines
+
+* Same as the `Output` guidelines, except that they must conform to the
+`output.ServiceOutput` interface.
+
+## Processor Plugins
+
+This section is for developers who want to create a new processor plugin.
+
+### Processor Plugin Guidelines
+
+* A processor must conform to the [`telegraf.Processor`](https://godoc.org/github.com/influxdata/telegraf#Processor) interface.
+* Processors should call `processors.Add` in their `init` function to register themselves.
+See below for a quick example.
+* To be available within Telegraf itself, plugins must add themselves to the
+`github.com/influxdata/telegraf/plugins/processors/all/all.go` file.
+* The `SampleConfig` function should return valid toml that describes how the
+processor can be configured. This is include in `telegraf -sample-config`.
+* The `Description` function should say in one line what this processor does.
+
+### Processor Example
+
+```go
+package printer
+
+// printer.go
+
+import (
+	"fmt"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/processors"
+)
+
+type Printer struct {
+}
+
+var sampleConfig = `
+`
+
+func (p *Printer) SampleConfig() string {
+	return sampleConfig
+}
+
+func (p *Printer) Description() string {
+	return "Print all metrics that pass through this filter."
+}
+
+func (p *Printer) Apply(in ...telegraf.Metric) []telegraf.Metric {
+	for _, metric := range in {
+		fmt.Println(metric.String())
+	}
+	return in
+}
+
+func init() {
+	processors.Add("printer", func() telegraf.Processor {
+		return &Printer{}
+	})
+}
+```
+
+## Aggregator Plugins
+
+This section is for developers who want to create a new aggregator plugin.
+
+### Aggregator Plugin Guidelines
+
+* A aggregator must conform to the [`telegraf.Aggregator`](https://godoc.org/github.com/influxdata/telegraf#Aggregator) interface.
+* Aggregators should call `aggregators.Add` in their `init` function to register themselves.
+See below for a quick example.
+* To be available within Telegraf itself, plugins must add themselves to the
+`github.com/influxdata/telegraf/plugins/aggregators/all/all.go` file.
+* The `SampleConfig` function should return valid toml that describes how the
+aggregator can be configured. This is include in `telegraf -sample-config`.
+* The `Description` function should say in one line what this aggregator does.
+* The Aggregator plugin will need to keep caches of metrics that have passed
+through it. This should be done using the builtin `HashID()` function of each
+metric.
+* When the `Reset()` function is called, all caches should be cleared.
+
+### Aggregator Example
+
+```go
+package min
+
+// min.go
+
+import (
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/aggregators"
+)
+
+type Min struct {
+	// caches for metric fields, names, and tags
+	fieldCache map[uint64]map[string]float64
+	nameCache  map[uint64]string
+	tagCache   map[uint64]map[string]string
+}
+
+func NewMin() telegraf.Aggregator {
+	m := &Min{}
+	m.Reset()
+	return m
+}
+
+var sampleConfig = `
+  ## period is the flush & clear interval of the aggregator.
+  period = "30s"
+  ## If true drop_original will drop the original metrics and
+  ## only send aggregates.
+  drop_original = false
+`
+
+func (m *Min) SampleConfig() string {
+	return sampleConfig
+}
+
+func (m *Min) Description() string {
+	return "Keep the aggregate min of each metric passing through."
+}
+
+func (m *Min) Add(in telegraf.Metric) {
+	id := in.HashID()
+	if _, ok := m.nameCache[id]; !ok {
+		// hit an uncached metric, create caches for first time:
+		m.nameCache[id] = in.Name()
+		m.tagCache[id] = in.Tags()
+		m.fieldCache[id] = make(map[string]float64)
+		for k, v := range in.Fields() {
+			if fv, ok := convert(v); ok {
+				m.fieldCache[id][k] = fv
+			}
+		}
+	} else {
+		for k, v := range in.Fields() {
+			if fv, ok := convert(v); ok {
+				if _, ok := m.fieldCache[id][k]; !ok {
+					// hit an uncached field of a cached metric
+					m.fieldCache[id][k] = fv
+					continue
+				}
+				if fv < m.fieldCache[id][k] {
+                    // set new minimum
+					m.fieldCache[id][k] = fv
+				}
+			}
+		}
+	}
+}
+
+func (m *Min) Push(acc telegraf.Accumulator) {
+	for id, _ := range m.nameCache {
+		fields := map[string]interface{}{}
+		for k, v := range m.fieldCache[id] {
+			fields[k+"_min"] = v
+		}
+		acc.AddFields(m.nameCache[id], fields, m.tagCache[id])
+	}
+}
+
+func (m *Min) Reset() {
+	m.fieldCache = make(map[uint64]map[string]float64)
+	m.nameCache = make(map[uint64]string)
+	m.tagCache = make(map[uint64]map[string]string)
+}
+
+func convert(in interface{}) (float64, bool) {
+	switch v := in.(type) {
+	case float64:
+		return v, true
+	case int64:
+		return float64(v), true
+	default:
+		return 0, false
+	}
+}
+
+func init() {
+	aggregators.Add("min", func() telegraf.Aggregator {
+		return NewMin()
+	})
+}
+```
+
+## Unit Tests
+
+### Execute short tests
+
+execute `make test-short`
+
+### Execute long tests
+
+As Telegraf collects metrics from several third-party services it becomes a
+difficult task to mock each service as some of them have complicated protocols
+which would take some time to replicate.
+
+To overcome this situation we've decided to use docker containers to provide a
+fast and reproducible environment to test those services which require it.
+For other situations
+(i.e: https://github.com/influxdata/telegraf/blob/master/plugins/inputs/redis/redis_test.go)
+a simple mock will suffice.
+
+To execute Telegraf tests follow these simple steps:
+
+- Install docker following [these](https://docs.docker.com/installation/)
+instructions
+- execute `make test`
+
+### Unit test troubleshooting
+
+Try cleaning up your test environment by executing `make docker-kill` and
+re-running

Godeps

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+github.com/stretchr/testify 1f4a1643a57e798696635ea4c126e9127adb7d3c
+github.com/vjeantet/grok 83bfdfdfd1a8146795b28e547a8e3c8b28a466c2
+github.com/wvanbergen/kafka 46f9a1cf3f670edec492029fadded9c2d9e18866
+github.com/wvanbergen/kazoo-go 0f768712ae6f76454f987c3356177e138df258f8
+github.com/yuin/gopher-lua bf3808abd44b1e55143a2d7f08571aaa80db1808
+github.com/zensqlmonitor/go-mssqldb ffe5510c6fa5e15e6d983210ab501c815b56b363
+golang.org/x/crypto c197bcf24cde29d3f73c7b4ac6fd41f4384e8af6
+golang.org/x/net 6acef71eb69611914f7a30939ea9f6e194c78172
+golang.org/x/text a71fd10341b064c10f4a81ceac72bcf70f26ea34
+gopkg.in/dancannon/gorethink.v1 7d1af5be49cb5ecc7b177bf387d232050299d6ef
+gopkg.in/fatih/pool.v2 cba550ebf9bce999a02e963296d4bc7a486cb715
+gopkg.in/mgo.v2 d90005c5262a3463800497ea5a89aed5fe22c886
+gopkg.in/yaml.v2 a83829b6f1293c91addabc89d0571c246397bbf4

Godeps_windows

@@ -0,0 +1,12 @@
+github.com/Microsoft/go-winio ce2922f643c8fd76b46cadc7f404a06282678b34
+github.com/StackExchange/wmi f3e2bae1e0cb5aef83e319133eabfee30013a4a5
+github.com/go-ole/go-ole be49f7c07711fcb603cff39e1de7c67926dc0ba7
+github.com/lxn/win 950a0e81e7678e63d8e6cd32412bdecb325ccd88
+github.com/shirou/w32 3c9377fc6748f222729a8270fe2775d149a249ad
+golang.org/x/sys a646d33e2ee3172a661fc09bca23bb4889a41bc8
+github.com/go-ini/ini 9144852efba7c4daf409943ee90767da62d55438
+github.com/jmespath/go-jmespath bd40a432e4c76585ef6b72d3fd96fb9b6dc7b68d
+github.com/pmezard/go-difflib/difflib 792786c7400a136282c1664665ae0a8db921c6c2
+github.com/stretchr/objx 1a9d0bb9f541897e62256577b352fdbc1fb4fd94
+gopkg.in/fsnotify.v1 a8a77c9133d2d6fd8334f3260d06f60e8d80a5fb
+gopkg.in/tomb.v1 dd632973f1e7218eb1089048e0798ec9ae7dceb8

Makefile

@@ -0,0 +1,96 @@
+VERSION := $(shell sh -c 'git describe --always --tags')
+BRANCH := $(shell sh -c 'git rev-parse --abbrev-ref HEAD')
+COMMIT := $(shell sh -c 'git rev-parse --short HEAD')
+ifdef GOBIN
+PATH := $(GOBIN):$(PATH)
+else
+PATH := $(subst :,/bin:,$(GOPATH))/bin:$(PATH)
+endif
+
+# Standard Telegraf build
+default: prepare build
+
+# Windows build
+windows: prepare-windows build-windows
+
+# Only run the build (no dependency grabbing)
+build:
+	go install -ldflags \
+		"-X main.version=$(VERSION) -X main.commit=$(COMMIT) -X main.branch=$(BRANCH)" ./...
+
+build-windows:
+	GOOS=windows GOARCH=amd64 go build -o telegraf.exe -ldflags \
+		"-X main.version=$(VERSION) -X main.commit=$(COMMIT) -X main.branch=$(BRANCH)" \
+		./cmd/telegraf/telegraf.go
+
+build-for-docker:
+	CGO_ENABLED=0 GOOS=linux go build -installsuffix cgo -o telegraf -ldflags \
+		"-s -X main.version=$(VERSION) -X main.commit=$(COMMIT) -X main.branch=$(BRANCH)" \
+		./cmd/telegraf/telegraf.go
+
+# run package script
+package:
+	./scripts/build.py --package --version="$(VERSION)" --platform=linux --arch=all --upload
+
+# Get dependencies and use gdm to checkout changesets
+prepare:
+	go get github.com/sparrc/gdm
+	gdm restore
+
+# Use the windows godeps file to prepare dependencies
+prepare-windows:
+	go get github.com/sparrc/gdm
+	gdm restore
+	gdm restore -f Godeps_windows
+
+# Run all docker containers necessary for unit tests
+docker-run:
+	docker run --name aerospike -p "3000:3000" -d aerospike/aerospike-server:3.9.0
+	docker run --name kafka \
+		-e ADVERTISED_HOST=localhost \
+		-e ADVERTISED_PORT=9092 \
+		-p "2181:2181" -p "9092:9092" \
+		-d spotify/kafka
+	docker run --name mysql -p "3306:3306" -e MYSQL_ALLOW_EMPTY_PASSWORD=yes -d mysql
+	docker run --name memcached -p "11211:11211" -d memcached
+	docker run --name postgres -p "5432:5432" -d postgres
+	docker run --name rabbitmq -p "15672:15672" -p "5672:5672" -d rabbitmq:3-management
+	docker run --name redis -p "6379:6379" -d redis
+	docker run --name nsq -p "4150:4150" -d nsqio/nsq /nsqd
+	docker run --name mqtt -p "1883:1883" -d ncarlier/mqtt
+	docker run --name riemann -p "5555:5555" -d blalor/riemann
+	docker run --name nats -p "4222:4222" -d nats
+
+# Run docker containers necessary for CircleCI unit tests
+docker-run-circle:
+	docker run --name aerospike -p "3000:3000" -d aerospike/aerospike-server:3.9.0
+	docker run --name kafka \
+		-e ADVERTISED_HOST=localhost \
+		-e ADVERTISED_PORT=9092 \
+		-p "2181:2181" -p "9092:9092" \
+		-d spotify/kafka
+	docker run --name nsq -p "4150:4150" -d nsqio/nsq /nsqd
+	docker run --name mqtt -p "1883:1883" -d ncarlier/mqtt
+	docker run --name riemann -p "5555:5555" -d blalor/riemann
+	docker run --name nats -p "4222:4222" -d nats
+
+# Kill all docker containers, ignore errors
+docker-kill:
+	-docker kill nsq aerospike redis rabbitmq postgres memcached mysql kafka mqtt riemann nats
+	-docker rm nsq aerospike redis rabbitmq postgres memcached mysql kafka mqtt riemann nats
+
+# Run full unit tests using docker containers (includes setup and teardown)
+test: vet docker-kill docker-run
+	# Sleeping for kafka leadership election, TSDB setup, etc.
+	sleep 60
+	# SUCCESS, running tests
+	go test -race ./...
+
+# Run "short" unit tests
+test-short: vet
+	go test -short ./...
+
+vet:
+	go vet ./...
+
+.PHONY: test test-short vet build default

PLUGINS.md

@@ -1,111 +0,0 @@
-Telegraf is entirely plugin driven. This interface allows for operators to
-pick and chose what is gathered as well as makes it easy for developers
-to create new ways of generating metrics.
-
-Plugin authorship is kept as simple as possible to promote people to develop
-and submit new plugins.
-
-## Guidelines
-
-* A plugin must conform to the `plugins.Plugin` interface.
-* Telegraf promises to run each plugin's Gather function serially. This means
-developers don't have to worry about thread safety within these functions.
-* Each generated metric automatically has the name of the plugin that generated
-it prepended. This is to keep plugins honest.
-* Plugins should call `plugins.Add` in their `init` function to register themselves.
-See below for a quick example.
-* To be available within Telegraf itself, plugins must add themselves to the `github.com/influxdb/telegraf/plugins/all/all.go` file.
-* The `SampleConfig` function should return valid toml that describes how the plugin can be configured. This is include in `telegraf -sample-config`.
-* The `Description` function should say in one line what this plugin does.
-
-### Plugin interface
-
-```go
-type Plugin interface {
-	SampleConfig() string
-	Description() string
-	Gather(Accumulator) error
-}
-
-type Accumulator interface {
-  Add(measurement string, value interface{}, tags map[string]string)
-  AddValuesWithTime(measurement string, values map[string]interface{}, tags map[string]string, timestamp time.Time)
-}
-```
-
-### Accumulator
-
-The way that a plugin emits metrics is by interacting with the Accumulator.
-
-The `Add` function takes 3 arguments:
-* **measurement**: A string description of the metric. For instance `bytes_read` or `faults`.
-* **value**: A value for the metric. This accepts 5 different types of value:
-  * **int**: The most common type. All int types are accepted but favor using `int64`
-  Useful for counters, etc.
-  * **float**: Favor `float64`, useful for gauges, percentages, etc.
-  * **bool**: `true` or `false`, useful to indicate the presence of a state. `light_on`, etc.
-  * **string**: Typically used to indicate a message, or some kind of freeform information.
-  * **time.Time**: Useful for indicating when a state last occurred, for instance `light_on_since`.
-* **tags**: This is a map of strings to strings to describe the where or who about the metric. For instance, the `net` plugin adds a tag named `"interface"` set to the name of the network interface, like `"eth0"`.
-
-The `AddValuesWithTime` allows multiple values for a point to be passed. The values
-used are the same type profile as **value** above. The **timestamp** argument
-allows a point to be registered as having occurred at an arbitrary time.
-
-Let's say you've written a plugin that emits metrics about processes on the current host.
-
-```go
-
-type Process struct {
-  CPUTime float64
-  MemoryBytes int64
-  PID int
-}
-
-func Gather(acc plugins.Accumulator) error {
-  for _, process := range system.Processes() {
-    tags := map[string]string {
-      "pid": fmt.Sprintf("%d", process.Pid),
-    }
-
-    acc.Add("cpu", process.CPUTime, tags)
-    acc.Add("memoory", process.MemoryBytes, tags)
-  }
-}
-```
-
-### Example
-
-```go
-
-// simple.go
-
-import "github.com/influxdb/telegraf/plugins"
-
-type Simple struct {
-  Ok bool
-}
-
-func (s *Simple) Description() string {
-  return "a demo plugin"
-}
-
-func (s *Simple) SampleConfig() string {
-  return "ok = true # indicate if everything is fine"
-}
-
-func (s *Simple) Gather(acc plugins.Accumulator) error {
-  if s.Ok {
-    acc.Add("state", "pretty good", nil)
-  } else {
-    acc.Add("state", "not great", nil)
-  }
-
-  return nil
-}
-
-func init() {
-  plugins.Add("simple", func() plugins.Plugin { &Simple{} })
-}
-```
-

README.md

@@ -1,25 +1,267 @@
-# Telegraf - A native agent for InfluxDB
+# Telegraf [![Circle CI](https://circleci.com/gh/influxdata/telegraf.svg?style=svg)](https://circleci.com/gh/influxdata/telegraf) [![Docker pulls](https://img.shields.io/docker/pulls/library/telegraf.svg)](https://hub.docker.com/_/telegraf/)
 
-## Quickstart
+Telegraf is an agent written in Go for collecting, processing, aggregating,
+and writing metrics.
 
-* Build from source or download telegraf (binaries forthcoming)
-* Run `telegraf -sample-config > telegraf.toml` to create an initial configuration
-* Edit the configuration to match your needs
-* Run `telegraf -config telegraf.toml -test` to output one full measurement sample to STDOUT
-* Run `telegraf -config telegraf.toml` to gather and send metrics to InfluxDB
+Design goals are to have a minimal memory footprint with a plugin system so
+that developers in the community can easily add support for collecting metrics
+from well known services (like Hadoop, Postgres, or Redis) and third party
+APIs (like Mailchimp, AWS CloudWatch, or Google Analytics).
 
-## Telegraf Options
+Telegraf is plugin-driven and has the concept of 4 distinct plugins:
 
-Telegraf has a few options you can configure under the `agent` section of the config. If you don't see an `agent` section run `telegraf -sample-config > telegraf.toml` to create a valid initial configuration:
+1. [Input Plugins](#input-plugins) collect metrics from the system, services, or 3rd party APIs
+2. [Processor Plugins](#processor-plugins) transform, decorate, and/or filter metrics
+3. [Aggregator Plugins](#aggregator-plugins) create aggregate metrics (e.g. mean, min, max, quantiles, etc.)
+4. [Output Plugins](#output-plugins) write metrics to various destinations
 
-* **hostname**: The hostname is passed as a tag. By default this will be the value retured by `hostname` on the machine running Telegraf. You can override that value here.
-* **interval**: How ofter to gather metrics. Uses a simple number + unit parser, ie "10s" for 10 seconds or "5m" for 5 minutes.
-* **debug**: Set to true to gather and send metrics to STDOUT as well as InfluxDB.
+For more information on Processor and Aggregator plugins please [read this](./docs/AGGREGATORS_AND_PROCESSORS.md).
 
-## Plugin Options
+New plugins are designed to be easy to contribute,
+we'll eagerly accept pull
+requests and will manage the set of plugins that Telegraf supports.
+See the [contributing guide](CONTRIBUTING.md) for instructions on writing
+new plugins.
 
-There are 3 configuration options that are configurable per plugin:
+## Installation:
 
-* **pass**: An array of strings that is used to filter metrics generated by the current plugin. Each string in the array is tested as a prefix against metrics and if it matches, the metric is emitted.
-* **drop**: The inverse of pass, if a metric matches, it is not emitted.
-* **interval**: How often to gather this metric. Normal plugins use a single global interval, but if one particular plugin should be run less or more often, you can configure that here.
+### Linux deb and rpm Packages:
+
+Latest:
+* https://dl.influxdata.com/telegraf/releases/telegraf_1.1.1_amd64.deb
+* https://dl.influxdata.com/telegraf/releases/telegraf-1.1.1.x86_64.rpm
+
+Latest (arm):
+* https://dl.influxdata.com/telegraf/releases/telegraf_1.1.1_armhf.deb
+* https://dl.influxdata.com/telegraf/releases/telegraf-1.1.1.armhf.rpm
+
+##### Package Instructions:
+
+* Telegraf binary is installed in `/usr/bin/telegraf`
+* Telegraf daemon configuration file is in `/etc/telegraf/telegraf.conf`
+* On sysv systems, the telegraf daemon can be controlled via
+`service telegraf [action]`
+* On systemd systems (such as Ubuntu 15+), the telegraf daemon can be
+controlled via `systemctl [action] telegraf`
+
+### yum/apt Repositories:
+
+There is a yum/apt repo available for the whole InfluxData stack, see
+[here](https://docs.influxdata.com/influxdb/latest/introduction/installation/#installation)
+for instructions on setting up the repo. Once it is configured, you will be able
+to use this repo to install & update telegraf.
+
+### Linux tarballs:
+
+Latest:
+* https://dl.influxdata.com/telegraf/releases/telegraf-1.1.1_linux_amd64.tar.gz
+* https://dl.influxdata.com/telegraf/releases/telegraf-1.1.1_linux_i386.tar.gz
+* https://dl.influxdata.com/telegraf/releases/telegraf-1.1.1_linux_armhf.tar.gz
+
+### FreeBSD tarball:
+
+Latest:
+* https://dl.influxdata.com/telegraf/releases/telegraf-1.1.1_freebsd_amd64.tar.gz
+
+### Ansible Role:
+
+Ansible role: https://github.com/rossmcdonald/telegraf
+
+### OSX via Homebrew:
+
+```
+brew update
+brew install telegraf
+```
+
+### Windows Binaries (EXPERIMENTAL)
+
+Latest:
+* https://dl.influxdata.com/telegraf/releases/telegraf-1.1.1_windows_amd64.zip
+
+### From Source:
+
+Telegraf manages dependencies via [gdm](https://github.com/sparrc/gdm),
+which gets installed via the Makefile
+if you don't have it already. You also must build with golang version 1.5+.
+
+1. [Install Go](https://golang.org/doc/install)
+2. [Setup your GOPATH](https://golang.org/doc/code.html#GOPATH)
+3. Run `go get github.com/influxdata/telegraf`
+4. Run `cd $GOPATH/src/github.com/influxdata/telegraf`
+5. Run `make`
+
+## How to use it:
+
+See usage with:
+
+```
+telegraf --help
+```
+
+### Generate a telegraf config file:
+
+```
+telegraf config > telegraf.conf
+```
+
+### Generate config with only cpu input & influxdb output plugins defined
+
+```
+telegraf --input-filter cpu --output-filter influxdb config
+```
+
+### Run a single telegraf collection, outputing metrics to stdout
+
+```
+telegraf --config telegraf.conf -test
+```
+
+### Run telegraf with all plugins defined in config file
+
+```
+telegraf --config telegraf.conf
+```
+
+### Run telegraf, enabling the cpu & memory input, and influxdb output plugins
+
+```
+telegraf --config telegraf.conf -input-filter cpu:mem -output-filter influxdb
+```
+
+
+## Configuration
+
+See the [configuration guide](docs/CONFIGURATION.md) for a rundown of the more advanced
+configuration options.
+
+## Input Plugins
+
+* [aws cloudwatch](./plugins/inputs/cloudwatch)
+* [aerospike](./plugins/inputs/aerospike)
+* [apache](./plugins/inputs/apache)
+* [bcache](./plugins/inputs/bcache)
+* [cassandra](./plugins/inputs/cassandra)
+* [ceph](./plugins/inputs/ceph)
+* [chrony](./plugins/inputs/chrony)
+* [consul](./plugins/inputs/consul)
+* [conntrack](./plugins/inputs/conntrack)
+* [couchbase](./plugins/inputs/couchbase)
+* [couchdb](./plugins/inputs/couchdb)
+* [disque](./plugins/inputs/disque)
+* [dns query time](./plugins/inputs/dns_query)
+* [docker](./plugins/inputs/docker)
+* [dovecot](./plugins/inputs/dovecot)
+* [elasticsearch](./plugins/inputs/elasticsearch)
+* [exec](./plugins/inputs/exec) (generic executable plugin, support JSON, influx, graphite and nagios)
+* [filestat](./plugins/inputs/filestat)
+* [haproxy](./plugins/inputs/haproxy)
+* [hddtemp](./plugins/inputs/hddtemp)
+* [http_response](./plugins/inputs/http_response)
+* [httpjson](./plugins/inputs/httpjson) (generic JSON-emitting http service plugin)
+* [internal](./plugins/inputs/internal)
+* [influxdb](./plugins/inputs/influxdb)
+* [ipmi_sensor](./plugins/inputs/ipmi_sensor)
+* [iptables](./plugins/inputs/iptables)
+* [jolokia](./plugins/inputs/jolokia)
+* [leofs](./plugins/inputs/leofs)
+* [lustre2](./plugins/inputs/lustre2)
+* [mailchimp](./plugins/inputs/mailchimp)
+* [memcached](./plugins/inputs/memcached)
+* [mesos](./plugins/inputs/mesos)
+* [mongodb](./plugins/inputs/mongodb)
+* [mysql](./plugins/inputs/mysql)
+* [net_response](./plugins/inputs/net_response)
+* [nginx](./plugins/inputs/nginx)
+* [nsq](./plugins/inputs/nsq)
+* [nstat](./plugins/inputs/nstat)
+* [ntpq](./plugins/inputs/ntpq)
+* [phpfpm](./plugins/inputs/phpfpm)
+* [phusion passenger](./plugins/inputs/passenger)
+* [ping](./plugins/inputs/ping)
+* [postgresql](./plugins/inputs/postgresql)
+* [postgresql_extensible](./plugins/inputs/postgresql_extensible)
+* [powerdns](./plugins/inputs/powerdns)
+* [procstat](./plugins/inputs/procstat)
+* [prometheus](./plugins/inputs/prometheus)
+* [puppetagent](./plugins/inputs/puppetagent)
+* [rabbitmq](./plugins/inputs/rabbitmq)
+* [raindrops](./plugins/inputs/raindrops)
+* [redis](./plugins/inputs/redis)
+* [rethinkdb](./plugins/inputs/rethinkdb)
+* [riak](./plugins/inputs/riak)
+* [sensors](./plugins/inputs/sensors)
+* [snmp](./plugins/inputs/snmp)
+* [snmp_legacy](./plugins/inputs/snmp_legacy)
+* [sql server](./plugins/inputs/sqlserver) (microsoft)
+* [twemproxy](./plugins/inputs/twemproxy)
+* [varnish](./plugins/inputs/varnish)
+* [zfs](./plugins/inputs/zfs)
+* [zookeeper](./plugins/inputs/zookeeper)
+* [win_perf_counters ](./plugins/inputs/win_perf_counters) (windows performance counters)
+* [sysstat](./plugins/inputs/sysstat)
+* [system](./plugins/inputs/system)
+    * cpu
+    * mem
+    * net
+    * netstat
+    * disk
+    * diskio
+    * swap
+    * processes
+    * kernel (/proc/stat)
+    * kernel (/proc/vmstat)
+
+Telegraf can also collect metrics via the following service plugins:
+
+* [http_listener](./plugins/inputs/http_listener)
+* [kafka_consumer](./plugins/inputs/kafka_consumer)
+* [mqtt_consumer](./plugins/inputs/mqtt_consumer)
+* [nats_consumer](./plugins/inputs/nats_consumer)
+* [nsq_consumer](./plugins/inputs/nsq_consumer)
+* [logparser](./plugins/inputs/logparser)
+* [statsd](./plugins/inputs/statsd)
+* [tail](./plugins/inputs/tail)
+* [tcp_listener](./plugins/inputs/tcp_listener)
+* [udp_listener](./plugins/inputs/udp_listener)
+* [webhooks](./plugins/inputs/webhooks)
+  * [filestack](./plugins/inputs/webhooks/filestack)
+  * [github](./plugins/inputs/webhooks/github)
+  * [mandrill](./plugins/inputs/webhooks/mandrill)
+  * [rollbar](./plugins/inputs/webhooks/rollbar)
+
+## Processor Plugins
+
+* [printer](./plugins/processors/printer)
+
+## Aggregator Plugins
+
+* [minmax](./plugins/aggregators/minmax)
+
+## Output Plugins
+
+* [influxdb](./plugins/outputs/influxdb)
+* [amon](./plugins/outputs/amon)
+* [amqp](./plugins/outputs/amqp)
+* [aws kinesis](./plugins/outputs/kinesis)
+* [aws cloudwatch](./plugins/outputs/cloudwatch)
+* [datadog](./plugins/outputs/datadog)
+* [discard](./plugins/outputs/discard)
+* [file](./plugins/outputs/file)
+* [graphite](./plugins/outputs/graphite)
+* [graylog](./plugins/outputs/graylog)
+* [instrumental](./plugins/outputs/instrumental)
+* [kafka](./plugins/outputs/kafka)
+* [librato](./plugins/outputs/librato)
+* [mqtt](./plugins/outputs/mqtt)
+* [nats](./plugins/outputs/nats)
+* [nsq](./plugins/outputs/nsq)
+* [opentsdb](./plugins/outputs/opentsdb)
+* [prometheus](./plugins/outputs/prometheus_client)
+* [riemann](./plugins/outputs/riemann)
+
+## Contributing
+
+Please see the
+[contributing guide](CONTRIBUTING.md)
+for details on contributing a plugin to Telegraf.

Vagrantfile

@@ -1,122 +0,0 @@
-# -*- mode: ruby -*-
-# vi: set ft=ruby :
-
-# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
-VAGRANTFILE_API_VERSION = "2"
-
-Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
-  # All Vagrant configuration is done here. The most common configuration
-  # options are documented and commented below. For a complete reference,
-  # please see the online documentation at vagrantup.com.
-
-  # Every Vagrant virtual environment requires a box to build off of.
-  config.vm.box = "ubuntu/trusty64"
-
-  # Disable automatic box update checking. If you disable this, then
-  # boxes will only be checked for updates when the user runs
-  # `vagrant box outdated`. This is not recommended.
-  # config.vm.box_check_update = false
-
-  # Create a forwarded port mapping which allows access to a specific port
-  # within the machine from a port on the host machine. In the example below,
-  # accessing "localhost:8080" will access port 80 on the guest machine.
-  # config.vm.network "forwarded_port", guest: 80, host: 8080
-
-  # Create a private network, which allows host-only access to the machine
-  # using a specific IP.
-  # config.vm.network "private_network", ip: "192.168.33.10"
-
-  # Create a public network, which generally matched to bridged network.
-  # Bridged networks make the machine appear as another physical device on
-  # your network.
-  # config.vm.network "public_network"
-
-  # If true, then any SSH connections made will enable agent forwarding.
-  # Default value: false
-  # config.ssh.forward_agent = true
-
-  # Share an additional folder to the guest VM. The first argument is
-  # the path on the host to the actual folder. The second argument is
-  # the path on the guest to mount the folder. And the optional third
-  # argument is a set of non-required options.
-  config.vm.synced_folder "~/go", "/home/vagrant/go"
-
-  # Provider-specific configuration so you can fine-tune various
-  # backing providers for Vagrant. These expose provider-specific options.
-  # Example for VirtualBox:
-  #
-  config.vm.provider "virtualbox" do |vb|
-  #   # Don't boot with headless mode
-  #   vb.gui = true
-  #
-  #   # Use VBoxManage to customize the VM. For example to change memory:
-    vb.customize ["modifyvm", :id, "--memory", "1024"]
-  end
-  #
-  # View the documentation for the provider you're using for more
-  # information on available options.
-
-  # Enable provisioning with CFEngine. CFEngine Community packages are
-  # automatically installed. For example, configure the host as a
-  # policy server and optionally a policy file to run:
-  #
-  # config.vm.provision "cfengine" do |cf|
-  #   cf.am_policy_hub = true
-  #   # cf.run_file = "motd.cf"
-  # end
-  #
-  # You can also configure and bootstrap a client to an existing
-  # policy server:
-  #
-  # config.vm.provision "cfengine" do |cf|
-  #   cf.policy_server_address = "10.0.2.15"
-  # end
-
-  # Enable provisioning with Puppet stand alone.  Puppet manifests
-  # are contained in a directory path relative to this Vagrantfile.
-  # You will need to create the manifests directory and a manifest in
-  # the file default.pp in the manifests_path directory.
-  #
-  # config.vm.provision "puppet" do |puppet|
-  #   puppet.manifests_path = "manifests"
-  #   puppet.manifest_file  = "site.pp"
-  # end
-
-  # Enable provisioning with chef solo, specifying a cookbooks path, roles
-  # path, and data_bags path (all relative to this Vagrantfile), and adding
-  # some recipes and/or roles.
-  #
-  # config.vm.provision "chef_solo" do |chef|
-  #   chef.cookbooks_path = "../my-recipes/cookbooks"
-  #   chef.roles_path = "../my-recipes/roles"
-  #   chef.data_bags_path = "../my-recipes/data_bags"
-  #   chef.add_recipe "mysql"
-  #   chef.add_role "web"
-  #
-  #   # You may also specify custom JSON attributes:
-  #   chef.json = { mysql_password: "foo" }
-  # end
-
-  # Enable provisioning with chef server, specifying the chef server URL,
-  # and the path to the validation key (relative to this Vagrantfile).
-  #
-  # The Opscode Platform uses HTTPS. Substitute your organization for
-  # ORGNAME in the URL and validation key.
-  #
-  # If you have your own Chef Server, use the appropriate URL, which may be
-  # HTTP instead of HTTPS depending on your configuration. Also change the
-  # validation key to validation.pem.
-  #
-  # config.vm.provision "chef_client" do |chef|
-  #   chef.chef_server_url = "https://api.opscode.com/organizations/ORGNAME"
-  #   chef.validation_key_path = "ORGNAME-validator.pem"
-  # end
-  #
-  # If you're using the Opscode platform, your validator client is
-  # ORGNAME-validator, replacing ORGNAME with your organization name.
-  #
-  # If you have your own Chef Server, the default validation client name is
-  # chef-validator, unless you changed the configuration.
-  #
-  #   chef.validation_client_name = "ORGNAME-validator"
-end

accumulator.go

@@ -1,91 +1,34 @@
 package telegraf
 
-import (
-	"fmt"
-	"sort"
-	"strings"
-	"time"
+import "time"
 
-	"github.com/influxdb/influxdb/client"
-)
+// Accumulator is an interface for "accumulating" metrics from plugin(s).
+// The metrics are sent down a channel shared between all plugins.
+type Accumulator interface {
+	// AddFields adds a metric to the accumulator with the given measurement
+	// name, fields, and tags (and timestamp). If a timestamp is not provided,
+	// then the accumulator sets it to "now".
+	// Create a point with a value, decorating it with tags
+	// NOTE: tags is expected to be owned by the caller, don't mutate
+	// it after passing to Add.
+	AddFields(measurement string,
+		fields map[string]interface{},
+		tags map[string]string,
+		t ...time.Time)
 
-type BatchPoints struct {
-	client.BatchPoints
+	// AddGauge is the same as AddFields, but will add the metric as a "Gauge" type
+	AddGauge(measurement string,
+		fields map[string]interface{},
+		tags map[string]string,
+		t ...time.Time)
 
-	Debug bool
+	// AddCounter is the same as AddFields, but will add the metric as a "Counter" type
+	AddCounter(measurement string,
+		fields map[string]interface{},
+		tags map[string]string,
+		t ...time.Time)
 
-	Prefix string
+	SetPrecision(precision, interval time.Duration)
 
-	Config *ConfiguredPlugin
-}
-
-func (bp *BatchPoints) Add(measurement string, val interface{}, tags map[string]string) {
-	measurement = bp.Prefix + measurement
-
-	if bp.Config != nil {
-		if !bp.Config.ShouldPass(measurement) {
-			return
-		}
-	}
-
-	if bp.Debug {
-		var tg []string
-
-		for k, v := range tags {
-			tg = append(tg, fmt.Sprintf("%s=\"%s\"", k, v))
-		}
-
-		sort.Strings(tg)
-
-		fmt.Printf("> [%s] %s value=%v\n", strings.Join(tg, " "), measurement, val)
-	}
-
-	bp.Points = append(bp.Points, client.Point{
-		Measurement: measurement,
-		Tags:        tags,
-		Fields: map[string]interface{}{
-			"value": val,
-		},
-	})
-}
-
-func (bp *BatchPoints) AddValuesWithTime(
-	measurement string,
-	values map[string]interface{},
-	tags map[string]string,
-	timestamp time.Time,
-) {
-	measurement = bp.Prefix + measurement
-
-	if bp.Config != nil {
-		if !bp.Config.ShouldPass(measurement) {
-			return
-		}
-	}
-
-	if bp.Debug {
-		var tg []string
-
-		for k, v := range tags {
-			tg = append(tg, fmt.Sprintf("%s=\"%s\"", k, v))
-		}
-
-		var vals []string
-
-		for k, v := range values {
-			vals = append(vals, fmt.Sprintf("%s=%v", k, v))
-		}
-
-		sort.Strings(tg)
-		sort.Strings(vals)
-
-		fmt.Printf("> [%s] %s %s\n", strings.Join(tg, " "), measurement, strings.Join(vals, " "))
-	}
-
-	bp.Points = append(bp.Points, client.Point{
-		Measurement: measurement,
-		Tags:        tags,
-		Fields:      values,
-		Time:        timestamp,
-	})
+	AddError(err error)
 }

agent.go

@@ -1,292 +0,0 @@
-package telegraf
-
-import (
-	"fmt"
-	"log"
-	"net/url"
-	"os"
-	"sort"
-	"sync"
-	"time"
-
-	"github.com/influxdb/influxdb/client"
-	"github.com/influxdb/telegraf/plugins"
-)
-
-type runningPlugin struct {
-	name   string
-	plugin plugins.Plugin
-	config *ConfiguredPlugin
-}
-
-type Agent struct {
-	Interval Duration
-	Debug    bool
-	Hostname string
-
-	Config *Config
-
-	plugins []*runningPlugin
-
-	conn *client.Client
-}
-
-func NewAgent(config *Config) (*Agent, error) {
-	agent := &Agent{Config: config, Interval: Duration{10 * time.Second}}
-
-	err := config.ApplyAgent(agent)
-	if err != nil {
-		return nil, err
-	}
-
-	if agent.Hostname == "" {
-		hostname, err := os.Hostname()
-		if err != nil {
-			return nil, err
-		}
-
-		agent.Hostname = hostname
-	}
-
-	if config.Tags == nil {
-		config.Tags = map[string]string{}
-	}
-
-	config.Tags["host"] = agent.Hostname
-
-	return agent, nil
-}
-
-func (agent *Agent) Connect() error {
-	config := agent.Config
-
-	u, err := url.Parse(config.URL)
-	if err != nil {
-		return err
-	}
-
-	c, err := client.NewClient(client.Config{
-		URL:       *u,
-		Username:  config.Username,
-		Password:  config.Password,
-		UserAgent: config.UserAgent,
-	})
-
-	if err != nil {
-		return err
-	}
-
-	agent.conn = c
-
-	return nil
-}
-
-func (a *Agent) LoadPlugins() ([]string, error) {
-	var names []string
-
-	for _, name := range a.Config.PluginsDeclared() {
-		creator, ok := plugins.Plugins[name]
-		if !ok {
-			return nil, fmt.Errorf("Undefined but requested plugin: %s", name)
-		}
-
-		plugin := creator()
-
-		config, err := a.Config.ApplyPlugin(name, plugin)
-		if err != nil {
-			return nil, err
-		}
-
-		a.plugins = append(a.plugins, &runningPlugin{name, plugin, config})
-		names = append(names, name)
-	}
-
-	sort.Strings(names)
-
-	return names, nil
-}
-
-func (a *Agent) crankParallel() error {
-	points := make(chan *BatchPoints, len(a.plugins))
-
-	var wg sync.WaitGroup
-
-	for _, plugin := range a.plugins {
-		if plugin.config.Interval != 0 {
-			continue
-		}
-
-		wg.Add(1)
-		go func(plugin *runningPlugin) {
-			defer wg.Done()
-
-			var acc BatchPoints
-			acc.Debug = a.Debug
-			acc.Prefix = plugin.name + "_"
-			acc.Config = plugin.config
-
-			plugin.plugin.Gather(&acc)
-
-			points <- &acc
-		}(plugin)
-	}
-
-	wg.Wait()
-
-	close(points)
-
-	var acc BatchPoints
-	acc.Tags = a.Config.Tags
-	acc.Time = time.Now()
-	acc.Database = a.Config.Database
-
-	for sub := range points {
-		acc.Points = append(acc.Points, sub.Points...)
-	}
-
-	_, err := a.conn.Write(acc.BatchPoints)
-	return err
-}
-
-func (a *Agent) crank() error {
-	var acc BatchPoints
-
-	acc.Debug = a.Debug
-
-	for _, plugin := range a.plugins {
-		acc.Prefix = plugin.name + "_"
-		acc.Config = plugin.config
-		err := plugin.plugin.Gather(&acc)
-		if err != nil {
-			return err
-		}
-	}
-
-	acc.Tags = a.Config.Tags
-	acc.Time = time.Now()
-	acc.Database = a.Config.Database
-
-	_, err := a.conn.Write(acc.BatchPoints)
-	return err
-}
-
-func (a *Agent) crankSeparate(shutdown chan struct{}, plugin *runningPlugin) error {
-	ticker := time.NewTicker(plugin.config.Interval)
-
-	for {
-		var acc BatchPoints
-
-		acc.Debug = a.Debug
-
-		acc.Prefix = plugin.name + "_"
-		acc.Config = plugin.config
-		err := plugin.plugin.Gather(&acc)
-		if err != nil {
-			return err
-		}
-
-		acc.Tags = a.Config.Tags
-		acc.Time = time.Now()
-		acc.Database = a.Config.Database
-
-		a.conn.Write(acc.BatchPoints)
-
-		select {
-		case <-shutdown:
-			return nil
-		case <-ticker.C:
-			continue
-		}
-	}
-}
-
-func (a *Agent) TestAllPlugins() error {
-	var names []string
-
-	for name, _ := range plugins.Plugins {
-		names = append(names, name)
-	}
-
-	sort.Strings(names)
-
-	var acc BatchPoints
-	acc.Debug = true
-
-	fmt.Printf("* Testing all plugins with default configuration\n")
-
-	for _, name := range names {
-		plugin := plugins.Plugins[name]()
-
-		fmt.Printf("* Plugin: %s\n", name)
-
-		acc.Prefix = name + "_"
-		err := plugin.Gather(&acc)
-		if err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-func (a *Agent) Test() error {
-	var acc BatchPoints
-
-	acc.Debug = true
-
-	for _, plugin := range a.plugins {
-		acc.Prefix = plugin.name + "_"
-		acc.Config = plugin.config
-
-		fmt.Printf("* Plugin: %s\n", plugin.name)
-		if plugin.config.Interval != 0 {
-			fmt.Printf("* Internal: %s\n", plugin.config.Interval)
-		}
-
-		err := plugin.plugin.Gather(&acc)
-		if err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-func (a *Agent) Run(shutdown chan struct{}) error {
-	if a.conn == nil {
-		err := a.Connect()
-		if err != nil {
-			return err
-		}
-	}
-
-	var wg sync.WaitGroup
-
-	for _, plugin := range a.plugins {
-		if plugin.config.Interval != 0 {
-			wg.Add(1)
-			go func(plugin *runningPlugin) {
-				defer wg.Done()
-				a.crankSeparate(shutdown, plugin)
-			}(plugin)
-		}
-	}
-
-	defer wg.Wait()
-
-	ticker := time.NewTicker(a.Interval.Duration)
-
-	for {
-		err := a.crankParallel()
-		if err != nil {
-			log.Printf("Error in plugins: %s", err)
-		}
-
-		select {
-		case <-shutdown:
-			return nil
-		case <-ticker.C:
-			continue
-		}
-	}
-}

agent/accumulator.go

@@ -0,0 +1,119 @@
+package agent
+
+import (
+	"log"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/selfstat"
+)
+
+var (
+	NErrors = selfstat.Register("agent", "gather_errors", map[string]string{})
+)
+
+type MetricMaker interface {
+	Name() string
+	MakeMetric(
+		measurement string,
+		fields map[string]interface{},
+		tags map[string]string,
+		mType telegraf.ValueType,
+		t time.Time,
+	) telegraf.Metric
+}
+
+func NewAccumulator(
+	maker MetricMaker,
+	metrics chan telegraf.Metric,
+) *accumulator {
+	acc := accumulator{
+		maker:     maker,
+		metrics:   metrics,
+		precision: time.Nanosecond,
+	}
+	return &acc
+}
+
+type accumulator struct {
+	metrics chan telegraf.Metric
+
+	maker MetricMaker
+
+	precision time.Duration
+}
+
+func (ac *accumulator) AddFields(
+	measurement string,
+	fields map[string]interface{},
+	tags map[string]string,
+	t ...time.Time,
+) {
+	if m := ac.maker.MakeMetric(measurement, fields, tags, telegraf.Untyped, ac.getTime(t)); m != nil {
+		ac.metrics <- m
+	}
+}
+
+func (ac *accumulator) AddGauge(
+	measurement string,
+	fields map[string]interface{},
+	tags map[string]string,
+	t ...time.Time,
+) {
+	if m := ac.maker.MakeMetric(measurement, fields, tags, telegraf.Gauge, ac.getTime(t)); m != nil {
+		ac.metrics <- m
+	}
+}
+
+func (ac *accumulator) AddCounter(
+	measurement string,
+	fields map[string]interface{},
+	tags map[string]string,
+	t ...time.Time,
+) {
+	if m := ac.maker.MakeMetric(measurement, fields, tags, telegraf.Counter, ac.getTime(t)); m != nil {
+		ac.metrics <- m
+	}
+}
+
+// AddError passes a runtime error to the accumulator.
+// The error will be tagged with the plugin name and written to the log.
+func (ac *accumulator) AddError(err error) {
+	if err == nil {
+		return
+	}
+	NErrors.Incr(1)
+	//TODO suppress/throttle consecutive duplicate errors?
+	log.Printf("E! Error in plugin [%s]: %s", ac.maker.Name(), err)
+}
+
+// SetPrecision takes two time.Duration objects. If the first is non-zero,
+// it sets that as the precision. Otherwise, it takes the second argument
+// as the order of time that the metrics should be rounded to, with the
+// maximum being 1s.
+func (ac *accumulator) SetPrecision(precision, interval time.Duration) {
+	if precision > 0 {
+		ac.precision = precision
+		return
+	}
+	switch {
+	case interval >= time.Second:
+		ac.precision = time.Second
+	case interval >= time.Millisecond:
+		ac.precision = time.Millisecond
+	case interval >= time.Microsecond:
+		ac.precision = time.Microsecond
+	default:
+		ac.precision = time.Nanosecond
+	}
+}
+
+func (ac accumulator) getTime(t []time.Time) time.Time {
+	var timestamp time.Time
+	if len(t) > 0 {
+		timestamp = t[0]
+	} else {
+		timestamp = time.Now()
+	}
+	return timestamp.Round(ac.precision)
+}

agent/accumulator_test.go

@@ -0,0 +1,340 @@
+package agent
+
+import (
+	"bytes"
+	"fmt"
+	"log"
+	"os"
+	"testing"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/metric"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestAdd(t *testing.T) {
+	now := time.Now()
+	metrics := make(chan telegraf.Metric, 10)
+	defer close(metrics)
+	a := NewAccumulator(&TestMetricMaker{}, metrics)
+
+	a.AddFields("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{})
+	a.AddFields("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{"acc": "test"})
+	a.AddFields("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{"acc": "test"}, now)
+
+	testm := <-metrics
+	actual := testm.String()
+	assert.Contains(t, actual, "acctest value=101")
+
+	testm = <-metrics
+	actual = testm.String()
+	assert.Contains(t, actual, "acctest,acc=test value=101")
+
+	testm = <-metrics
+	actual = testm.String()
+	assert.Equal(t,
+		fmt.Sprintf("acctest,acc=test value=101 %d\n", now.UnixNano()),
+		actual)
+}
+
+func TestAddFields(t *testing.T) {
+	now := time.Now()
+	metrics := make(chan telegraf.Metric, 10)
+	defer close(metrics)
+	a := NewAccumulator(&TestMetricMaker{}, metrics)
+
+	fields := map[string]interface{}{
+		"usage": float64(99),
+	}
+	a.AddFields("acctest", fields, map[string]string{})
+	a.AddGauge("acctest", fields, map[string]string{"acc": "test"})
+	a.AddCounter("acctest", fields, map[string]string{"acc": "test"}, now)
+
+	testm := <-metrics
+	actual := testm.String()
+	assert.Contains(t, actual, "acctest usage=99")
+
+	testm = <-metrics
+	actual = testm.String()
+	assert.Contains(t, actual, "acctest,acc=test usage=99")
+
+	testm = <-metrics
+	actual = testm.String()
+	assert.Equal(t,
+		fmt.Sprintf("acctest,acc=test usage=99 %d\n", now.UnixNano()),
+		actual)
+}
+
+func TestAccAddError(t *testing.T) {
+	errBuf := bytes.NewBuffer(nil)
+	log.SetOutput(errBuf)
+	defer log.SetOutput(os.Stderr)
+
+	metrics := make(chan telegraf.Metric, 10)
+	defer close(metrics)
+	a := NewAccumulator(&TestMetricMaker{}, metrics)
+
+	a.AddError(fmt.Errorf("foo"))
+	a.AddError(fmt.Errorf("bar"))
+	a.AddError(fmt.Errorf("baz"))
+
+	errs := bytes.Split(errBuf.Bytes(), []byte{'\n'})
+	assert.EqualValues(t, int64(3), NErrors.Get())
+	require.Len(t, errs, 4) // 4 because of trailing newline
+	assert.Contains(t, string(errs[0]), "TestPlugin")
+	assert.Contains(t, string(errs[0]), "foo")
+	assert.Contains(t, string(errs[1]), "TestPlugin")
+	assert.Contains(t, string(errs[1]), "bar")
+	assert.Contains(t, string(errs[2]), "TestPlugin")
+	assert.Contains(t, string(errs[2]), "baz")
+}
+
+func TestAddNoIntervalWithPrecision(t *testing.T) {
+	now := time.Date(2006, time.February, 10, 12, 0, 0, 82912748, time.UTC)
+	metrics := make(chan telegraf.Metric, 10)
+	defer close(metrics)
+	a := NewAccumulator(&TestMetricMaker{}, metrics)
+	a.SetPrecision(0, time.Second)
+
+	a.AddFields("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{})
+	a.AddFields("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{"acc": "test"})
+	a.AddFields("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{"acc": "test"}, now)
+
+	testm := <-a.metrics
+	actual := testm.String()
+	assert.Contains(t, actual, "acctest value=101")
+
+	testm = <-a.metrics
+	actual = testm.String()
+	assert.Contains(t, actual, "acctest,acc=test value=101")
+
+	testm = <-a.metrics
+	actual = testm.String()
+	assert.Equal(t,
+		fmt.Sprintf("acctest,acc=test value=101 %d\n", int64(1139572800000000000)),
+		actual)
+}
+
+func TestAddDisablePrecision(t *testing.T) {
+	now := time.Date(2006, time.February, 10, 12, 0, 0, 82912748, time.UTC)
+	metrics := make(chan telegraf.Metric, 10)
+	defer close(metrics)
+	a := NewAccumulator(&TestMetricMaker{}, metrics)
+
+	a.SetPrecision(time.Nanosecond, 0)
+	a.AddFields("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{})
+	a.AddFields("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{"acc": "test"})
+	a.AddFields("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{"acc": "test"}, now)
+
+	testm := <-a.metrics
+	actual := testm.String()
+	assert.Contains(t, actual, "acctest value=101")
+
+	testm = <-a.metrics
+	actual = testm.String()
+	assert.Contains(t, actual, "acctest,acc=test value=101")
+
+	testm = <-a.metrics
+	actual = testm.String()
+	assert.Equal(t,
+		fmt.Sprintf("acctest,acc=test value=101 %d\n", int64(1139572800082912748)),
+		actual)
+}
+
+func TestAddNoPrecisionWithInterval(t *testing.T) {
+	now := time.Date(2006, time.February, 10, 12, 0, 0, 82912748, time.UTC)
+	metrics := make(chan telegraf.Metric, 10)
+	defer close(metrics)
+	a := NewAccumulator(&TestMetricMaker{}, metrics)
+
+	a.SetPrecision(0, time.Second)
+	a.AddFields("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{})
+	a.AddFields("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{"acc": "test"})
+	a.AddFields("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{"acc": "test"}, now)
+
+	testm := <-a.metrics
+	actual := testm.String()
+	assert.Contains(t, actual, "acctest value=101")
+
+	testm = <-a.metrics
+	actual = testm.String()
+	assert.Contains(t, actual, "acctest,acc=test value=101")
+
+	testm = <-a.metrics
+	actual = testm.String()
+	assert.Equal(t,
+		fmt.Sprintf("acctest,acc=test value=101 %d\n", int64(1139572800000000000)),
+		actual)
+}
+
+func TestDifferentPrecisions(t *testing.T) {
+	now := time.Date(2006, time.February, 10, 12, 0, 0, 82912748, time.UTC)
+	metrics := make(chan telegraf.Metric, 10)
+	defer close(metrics)
+	a := NewAccumulator(&TestMetricMaker{}, metrics)
+
+	a.SetPrecision(0, time.Second)
+	a.AddFields("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{"acc": "test"}, now)
+	testm := <-a.metrics
+	actual := testm.String()
+	assert.Equal(t,
+		fmt.Sprintf("acctest,acc=test value=101 %d\n", int64(1139572800000000000)),
+		actual)
+
+	a.SetPrecision(0, time.Millisecond)
+	a.AddFields("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{"acc": "test"}, now)
+	testm = <-a.metrics
+	actual = testm.String()
+	assert.Equal(t,
+		fmt.Sprintf("acctest,acc=test value=101 %d\n", int64(1139572800083000000)),
+		actual)
+
+	a.SetPrecision(0, time.Microsecond)
+	a.AddFields("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{"acc": "test"}, now)
+	testm = <-a.metrics
+	actual = testm.String()
+	assert.Equal(t,
+		fmt.Sprintf("acctest,acc=test value=101 %d\n", int64(1139572800082913000)),
+		actual)
+
+	a.SetPrecision(0, time.Nanosecond)
+	a.AddFields("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{"acc": "test"}, now)
+	testm = <-a.metrics
+	actual = testm.String()
+	assert.Equal(t,
+		fmt.Sprintf("acctest,acc=test value=101 %d\n", int64(1139572800082912748)),
+		actual)
+}
+
+func TestAddGauge(t *testing.T) {
+	now := time.Now()
+	metrics := make(chan telegraf.Metric, 10)
+	defer close(metrics)
+	a := NewAccumulator(&TestMetricMaker{}, metrics)
+
+	a.AddGauge("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{})
+	a.AddGauge("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{"acc": "test"})
+	a.AddGauge("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{"acc": "test"}, now)
+
+	testm := <-metrics
+	actual := testm.String()
+	assert.Contains(t, actual, "acctest value=101")
+	assert.Equal(t, testm.Type(), telegraf.Gauge)
+
+	testm = <-metrics
+	actual = testm.String()
+	assert.Contains(t, actual, "acctest,acc=test value=101")
+	assert.Equal(t, testm.Type(), telegraf.Gauge)
+
+	testm = <-metrics
+	actual = testm.String()
+	assert.Equal(t,
+		fmt.Sprintf("acctest,acc=test value=101 %d\n", now.UnixNano()),
+		actual)
+	assert.Equal(t, testm.Type(), telegraf.Gauge)
+}
+
+func TestAddCounter(t *testing.T) {
+	now := time.Now()
+	metrics := make(chan telegraf.Metric, 10)
+	defer close(metrics)
+	a := NewAccumulator(&TestMetricMaker{}, metrics)
+
+	a.AddCounter("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{})
+	a.AddCounter("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{"acc": "test"})
+	a.AddCounter("acctest",
+		map[string]interface{}{"value": float64(101)},
+		map[string]string{"acc": "test"}, now)
+
+	testm := <-metrics
+	actual := testm.String()
+	assert.Contains(t, actual, "acctest value=101")
+	assert.Equal(t, testm.Type(), telegraf.Counter)
+
+	testm = <-metrics
+	actual = testm.String()
+	assert.Contains(t, actual, "acctest,acc=test value=101")
+	assert.Equal(t, testm.Type(), telegraf.Counter)
+
+	testm = <-metrics
+	actual = testm.String()
+	assert.Equal(t,
+		fmt.Sprintf("acctest,acc=test value=101 %d\n", now.UnixNano()),
+		actual)
+	assert.Equal(t, testm.Type(), telegraf.Counter)
+}
+
+type TestMetricMaker struct {
+}
+
+func (tm *TestMetricMaker) Name() string {
+	return "TestPlugin"
+}
+func (tm *TestMetricMaker) MakeMetric(
+	measurement string,
+	fields map[string]interface{},
+	tags map[string]string,
+	mType telegraf.ValueType,
+	t time.Time,
+) telegraf.Metric {
+	switch mType {
+	case telegraf.Untyped:
+		if m, err := metric.New(measurement, tags, fields, t); err == nil {
+			return m
+		}
+	case telegraf.Counter:
+		if m, err := metric.New(measurement, tags, fields, t, telegraf.Counter); err == nil {
+			return m
+		}
+	case telegraf.Gauge:
+		if m, err := metric.New(measurement, tags, fields, t, telegraf.Gauge); err == nil {
+			return m
+		}
+	}
+	return nil
+}

agent/agent.go

@@ -0,0 +1,385 @@
+package agent
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"runtime"
+	"sync"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/internal"
+	"github.com/influxdata/telegraf/internal/config"
+	"github.com/influxdata/telegraf/internal/models"
+	"github.com/influxdata/telegraf/selfstat"
+)
+
+// Agent runs telegraf and collects data based on the given config
+type Agent struct {
+	Config *config.Config
+}
+
+// NewAgent returns an Agent struct based off the given Config
+func NewAgent(config *config.Config) (*Agent, error) {
+	a := &Agent{
+		Config: config,
+	}
+
+	if !a.Config.Agent.OmitHostname {
+		if a.Config.Agent.Hostname == "" {
+			hostname, err := os.Hostname()
+			if err != nil {
+				return nil, err
+			}
+
+			a.Config.Agent.Hostname = hostname
+		}
+
+		config.Tags["host"] = a.Config.Agent.Hostname
+	}
+
+	return a, nil
+}
+
+// Connect connects to all configured outputs
+func (a *Agent) Connect() error {
+	for _, o := range a.Config.Outputs {
+		switch ot := o.Output.(type) {
+		case telegraf.ServiceOutput:
+			if err := ot.Start(); err != nil {
+				log.Printf("E! Service for output %s failed to start, exiting\n%s\n",
+					o.Name, err.Error())
+				return err
+			}
+		}
+
+		log.Printf("D! Attempting connection to output: %s\n", o.Name)
+		err := o.Output.Connect()
+		if err != nil {
+			log.Printf("E! Failed to connect to output %s, retrying in 15s, "+
+				"error was '%s' \n", o.Name, err)
+			time.Sleep(15 * time.Second)
+			err = o.Output.Connect()
+			if err != nil {
+				return err
+			}
+		}
+		log.Printf("D! Successfully connected to output: %s\n", o.Name)
+	}
+	return nil
+}
+
+// Close closes the connection to all configured outputs
+func (a *Agent) Close() error {
+	var err error
+	for _, o := range a.Config.Outputs {
+		err = o.Output.Close()
+		switch ot := o.Output.(type) {
+		case telegraf.ServiceOutput:
+			ot.Stop()
+		}
+	}
+	return err
+}
+
+func panicRecover(input *models.RunningInput) {
+	if err := recover(); err != nil {
+		trace := make([]byte, 2048)
+		runtime.Stack(trace, true)
+		log.Printf("E! FATAL: Input [%s] panicked: %s, Stack:\n%s\n",
+			input.Name(), err, trace)
+		log.Println("E! PLEASE REPORT THIS PANIC ON GITHUB with " +
+			"stack trace, configuration, and OS information: " +
+			"https://github.com/influxdata/telegraf/issues/new")
+	}
+}
+
+// gatherer runs the inputs that have been configured with their own
+// reporting interval.
+func (a *Agent) gatherer(
+	shutdown chan struct{},
+	input *models.RunningInput,
+	interval time.Duration,
+	metricC chan telegraf.Metric,
+) {
+	defer panicRecover(input)
+
+	GatherTime := selfstat.RegisterTiming("gather",
+		"gather_time_ns",
+		map[string]string{"input": input.Config.Name},
+	)
+
+	acc := NewAccumulator(input, metricC)
+	acc.SetPrecision(a.Config.Agent.Precision.Duration,
+		a.Config.Agent.Interval.Duration)
+
+	ticker := time.NewTicker(interval)
+	defer ticker.Stop()
+
+	for {
+		internal.RandomSleep(a.Config.Agent.CollectionJitter.Duration, shutdown)
+
+		start := time.Now()
+		gatherWithTimeout(shutdown, input, acc, interval)
+		elapsed := time.Since(start)
+
+		GatherTime.Incr(elapsed.Nanoseconds())
+
+		select {
+		case <-shutdown:
+			return
+		case <-ticker.C:
+			continue
+		}
+	}
+}
+
+// gatherWithTimeout gathers from the given input, with the given timeout.
+//   when the given timeout is reached, gatherWithTimeout logs an error message
+//   but continues waiting for it to return. This is to avoid leaving behind
+//   hung processes, and to prevent re-calling the same hung process over and
+//   over.
+func gatherWithTimeout(
+	shutdown chan struct{},
+	input *models.RunningInput,
+	acc *accumulator,
+	timeout time.Duration,
+) {
+	ticker := time.NewTicker(timeout)
+	defer ticker.Stop()
+	done := make(chan error)
+	go func() {
+		done <- input.Input.Gather(acc)
+	}()
+
+	for {
+		select {
+		case err := <-done:
+			if err != nil {
+				log.Printf("E! ERROR in input [%s]: %s", input.Name(), err)
+			}
+			return
+		case <-ticker.C:
+			log.Printf("E! ERROR: input [%s] took longer to collect than "+
+				"collection interval (%s)",
+				input.Name(), timeout)
+			continue
+		case <-shutdown:
+			return
+		}
+	}
+}
+
+// Test verifies that we can 'Gather' from all inputs with their configured
+// Config struct
+func (a *Agent) Test() error {
+	shutdown := make(chan struct{})
+	defer close(shutdown)
+	metricC := make(chan telegraf.Metric)
+
+	// dummy receiver for the point channel
+	go func() {
+		for {
+			select {
+			case <-metricC:
+				// do nothing
+			case <-shutdown:
+				return
+			}
+		}
+	}()
+
+	for _, input := range a.Config.Inputs {
+		acc := NewAccumulator(input, metricC)
+		acc.SetPrecision(a.Config.Agent.Precision.Duration,
+			a.Config.Agent.Interval.Duration)
+		input.SetTrace(true)
+		input.SetDefaultTags(a.Config.Tags)
+
+		fmt.Printf("* Plugin: %s, Collection 1\n", input.Name())
+		if input.Config.Interval != 0 {
+			fmt.Printf("* Internal: %s\n", input.Config.Interval)
+		}
+
+		if err := input.Input.Gather(acc); err != nil {
+			return err
+		}
+
+		// Special instructions for some inputs. cpu, for example, needs to be
+		// run twice in order to return cpu usage percentages.
+		switch input.Name() {
+		case "cpu", "mongodb", "procstat":
+			time.Sleep(500 * time.Millisecond)
+			fmt.Printf("* Plugin: %s, Collection 2\n", input.Name())
+			if err := input.Input.Gather(acc); err != nil {
+				return err
+			}
+		}
+
+	}
+	return nil
+}
+
+// flush writes a list of metrics to all configured outputs
+func (a *Agent) flush() {
+	var wg sync.WaitGroup
+
+	wg.Add(len(a.Config.Outputs))
+	for _, o := range a.Config.Outputs {
+		go func(output *models.RunningOutput) {
+			defer wg.Done()
+			err := output.Write()
+			if err != nil {
+				log.Printf("E! Error writing to output [%s]: %s\n",
+					output.Name, err.Error())
+			}
+		}(o)
+	}
+
+	wg.Wait()
+}
+
+// flusher monitors the metrics input channel and flushes on the minimum interval
+func (a *Agent) flusher(shutdown chan struct{}, metricC chan telegraf.Metric) error {
+	// Inelegant, but this sleep is to allow the Gather threads to run, so that
+	// the flusher will flush after metrics are collected.
+	time.Sleep(time.Millisecond * 300)
+
+	// create an output metric channel and a gorouting that continously passes
+	// each metric onto the output plugins & aggregators.
+	outMetricC := make(chan telegraf.Metric, 100)
+	var wg sync.WaitGroup
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		for {
+			select {
+			case <-shutdown:
+				if len(outMetricC) > 0 {
+					// keep going until outMetricC is flushed
+					continue
+				}
+				return
+			case m := <-outMetricC:
+				// if dropOriginal is set to true, then we will only send this
+				// metric to the aggregators, not the outputs.
+				var dropOriginal bool
+				if !m.IsAggregate() {
+					for _, agg := range a.Config.Aggregators {
+						if ok := agg.Add(m.Copy()); ok {
+							dropOriginal = true
+						}
+					}
+				}
+				if !dropOriginal {
+					for i, o := range a.Config.Outputs {
+						if i == len(a.Config.Outputs)-1 {
+							o.AddMetric(m)
+						} else {
+							o.AddMetric(m.Copy())
+						}
+					}
+				}
+			}
+		}
+	}()
+
+	ticker := time.NewTicker(a.Config.Agent.FlushInterval.Duration)
+	for {
+		select {
+		case <-shutdown:
+			log.Println("I! Hang on, flushing any cached metrics before shutdown")
+			// wait for outMetricC to get flushed before flushing outputs
+			wg.Wait()
+			a.flush()
+			return nil
+		case <-ticker.C:
+			internal.RandomSleep(a.Config.Agent.FlushJitter.Duration, shutdown)
+			a.flush()
+		case metric := <-metricC:
+			// NOTE potential bottleneck here as we put each metric through the
+			// processors serially.
+			mS := []telegraf.Metric{metric}
+			for _, processor := range a.Config.Processors {
+				mS = processor.Apply(mS...)
+			}
+			for _, m := range mS {
+				outMetricC <- m
+			}
+		}
+	}
+}
+
+// Run runs the agent daemon, gathering every Interval
+func (a *Agent) Run(shutdown chan struct{}) error {
+	var wg sync.WaitGroup
+
+	log.Printf("I! Agent Config: Interval:%s, Quiet:%#v, Hostname:%#v, "+
+		"Flush Interval:%s \n",
+		a.Config.Agent.Interval.Duration, a.Config.Agent.Quiet,
+		a.Config.Agent.Hostname, a.Config.Agent.FlushInterval.Duration)
+
+	// channel shared between all input threads for accumulating metrics
+	metricC := make(chan telegraf.Metric, 100)
+
+	// Start all ServicePlugins
+	for _, input := range a.Config.Inputs {
+		input.SetDefaultTags(a.Config.Tags)
+		switch p := input.Input.(type) {
+		case telegraf.ServiceInput:
+			acc := NewAccumulator(input, metricC)
+			// Service input plugins should set their own precision of their
+			// metrics.
+			acc.SetPrecision(time.Nanosecond, 0)
+			if err := p.Start(acc); err != nil {
+				log.Printf("E! Service for input %s failed to start, exiting\n%s\n",
+					input.Name(), err.Error())
+				return err
+			}
+			defer p.Stop()
+		}
+	}
+
+	// Round collection to nearest interval by sleeping
+	if a.Config.Agent.RoundInterval {
+		i := int64(a.Config.Agent.Interval.Duration)
+		time.Sleep(time.Duration(i - (time.Now().UnixNano() % i)))
+	}
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		if err := a.flusher(shutdown, metricC); err != nil {
+			log.Printf("E! Flusher routine failed, exiting: %s\n", err.Error())
+			close(shutdown)
+		}
+	}()
+
+	wg.Add(len(a.Config.Aggregators))
+	for _, aggregator := range a.Config.Aggregators {
+		go func(agg *models.RunningAggregator) {
+			defer wg.Done()
+			acc := NewAccumulator(agg, metricC)
+			acc.SetPrecision(a.Config.Agent.Precision.Duration,
+				a.Config.Agent.Interval.Duration)
+			agg.Run(acc, shutdown)
+		}(aggregator)
+	}
+
+	wg.Add(len(a.Config.Inputs))
+	for _, input := range a.Config.Inputs {
+		interval := a.Config.Agent.Interval.Duration
+		// overwrite global interval if this plugin has it's own.
+		if input.Config.Interval != 0 {
+			interval = input.Config.Interval
+		}
+		go func(in *models.RunningInput, interv time.Duration) {
+			defer wg.Done()
+			a.gatherer(shutdown, in, interv, metricC)
+		}(input, interval)
+	}
+
+	wg.Wait()
+	return nil
+}

agent/agent_test.go

@@ -0,0 +1,111 @@
+package agent
+
+import (
+	"testing"
+
+	"github.com/influxdata/telegraf/internal/config"
+
+	// needing to load the plugins
+	_ "github.com/influxdata/telegraf/plugins/inputs/all"
+	// needing to load the outputs
+	_ "github.com/influxdata/telegraf/plugins/outputs/all"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAgent_OmitHostname(t *testing.T) {
+	c := config.NewConfig()
+	c.Agent.OmitHostname = true
+	_, err := NewAgent(c)
+	assert.NoError(t, err)
+	assert.NotContains(t, c.Tags, "host")
+}
+
+func TestAgent_LoadPlugin(t *testing.T) {
+	c := config.NewConfig()
+	c.InputFilters = []string{"mysql"}
+	err := c.LoadConfig("../internal/config/testdata/telegraf-agent.toml")
+	assert.NoError(t, err)
+	a, _ := NewAgent(c)
+	assert.Equal(t, 1, len(a.Config.Inputs))
+
+	c = config.NewConfig()
+	c.InputFilters = []string{"foo"}
+	err = c.LoadConfig("../internal/config/testdata/telegraf-agent.toml")
+	assert.NoError(t, err)
+	a, _ = NewAgent(c)
+	assert.Equal(t, 0, len(a.Config.Inputs))
+
+	c = config.NewConfig()
+	c.InputFilters = []string{"mysql", "foo"}
+	err = c.LoadConfig("../internal/config/testdata/telegraf-agent.toml")
+	assert.NoError(t, err)
+	a, _ = NewAgent(c)
+	assert.Equal(t, 1, len(a.Config.Inputs))
+
+	c = config.NewConfig()
+	c.InputFilters = []string{"mysql", "redis"}
+	err = c.LoadConfig("../internal/config/testdata/telegraf-agent.toml")
+	assert.NoError(t, err)
+	a, _ = NewAgent(c)
+	assert.Equal(t, 2, len(a.Config.Inputs))
+
+	c = config.NewConfig()
+	c.InputFilters = []string{"mysql", "foo", "redis", "bar"}
+	err = c.LoadConfig("../internal/config/testdata/telegraf-agent.toml")
+	assert.NoError(t, err)
+	a, _ = NewAgent(c)
+	assert.Equal(t, 2, len(a.Config.Inputs))
+}
+
+func TestAgent_LoadOutput(t *testing.T) {
+	c := config.NewConfig()
+	c.OutputFilters = []string{"influxdb"}
+	err := c.LoadConfig("../internal/config/testdata/telegraf-agent.toml")
+	assert.NoError(t, err)
+	a, _ := NewAgent(c)
+	assert.Equal(t, 2, len(a.Config.Outputs))
+
+	c = config.NewConfig()
+	c.OutputFilters = []string{"kafka"}
+	err = c.LoadConfig("../internal/config/testdata/telegraf-agent.toml")
+	assert.NoError(t, err)
+	a, _ = NewAgent(c)
+	assert.Equal(t, 1, len(a.Config.Outputs))
+
+	c = config.NewConfig()
+	c.OutputFilters = []string{}
+	err = c.LoadConfig("../internal/config/testdata/telegraf-agent.toml")
+	assert.NoError(t, err)
+	a, _ = NewAgent(c)
+	assert.Equal(t, 3, len(a.Config.Outputs))
+
+	c = config.NewConfig()
+	c.OutputFilters = []string{"foo"}
+	err = c.LoadConfig("../internal/config/testdata/telegraf-agent.toml")
+	assert.NoError(t, err)
+	a, _ = NewAgent(c)
+	assert.Equal(t, 0, len(a.Config.Outputs))
+
+	c = config.NewConfig()
+	c.OutputFilters = []string{"influxdb", "foo"}
+	err = c.LoadConfig("../internal/config/testdata/telegraf-agent.toml")
+	assert.NoError(t, err)
+	a, _ = NewAgent(c)
+	assert.Equal(t, 2, len(a.Config.Outputs))
+
+	c = config.NewConfig()
+	c.OutputFilters = []string{"influxdb", "kafka"}
+	err = c.LoadConfig("../internal/config/testdata/telegraf-agent.toml")
+	assert.NoError(t, err)
+	assert.Equal(t, 3, len(c.Outputs))
+	a, _ = NewAgent(c)
+	assert.Equal(t, 3, len(a.Config.Outputs))
+
+	c = config.NewConfig()
+	c.OutputFilters = []string{"influxdb", "foo", "kafka", "bar"}
+	err = c.LoadConfig("../internal/config/testdata/telegraf-agent.toml")
+	assert.NoError(t, err)
+	a, _ = NewAgent(c)
+	assert.Equal(t, 3, len(a.Config.Outputs))
+}

agent_test.go

@@ -1,61 +0,0 @@
-package telegraf
-
-/*
-func TestAgent_DrivesMetrics(t *testing.T) {
-	var (
-		plugin  plugins.MockPlugin
-	)
-
-	defer plugin.AssertExpectations(t)
-	defer metrics.AssertExpectations(t)
-
-	a := &Agent{
-		plugins: []plugins.Plugin{&plugin},
-		Config:  &Config{},
-	}
-
-	plugin.On("Add", "foo", 1.2, nil).Return(nil)
-	plugin.On("Add", "bar", 888, nil).Return(nil)
-
-	err := a.crank()
-	require.NoError(t, err)
-}
-
-func TestAgent_AppliesTags(t *testing.T) {
-	var (
-		plugin  plugins.MockPlugin
-		metrics MockMetrics
-	)
-
-	defer plugin.AssertExpectations(t)
-	defer metrics.AssertExpectations(t)
-
-	a := &Agent{
-		plugins: []plugins.Plugin{&plugin},
-		metrics: &metrics,
-		Config: &Config{
-			Tags: map[string]string{
-				"dc": "us-west-1",
-			},
-		},
-	}
-
-	m1 := cypress.Metric()
-	m1.Add("name", "foo")
-	m1.Add("value", 1.2)
-
-	msgs := []*cypress.Message{m1}
-
-	m2 := cypress.Metric()
-	m2.Timestamp = m1.Timestamp
-	m2.Add("name", "foo")
-	m2.Add("value", 1.2)
-	m2.AddTag("dc", "us-west-1")
-
-	plugin.On("Read").Return(msgs, nil)
-	metrics.On("Receive", m2).Return(nil)
-
-	err := a.crank()
-	require.NoError(t, err)
-}
-*/

aggregator.go

@@ -0,0 +1,22 @@
+package telegraf
+
+// Aggregator is an interface for implementing an Aggregator plugin.
+// the RunningAggregator wraps this interface and guarantees that
+// Add, Push, and Reset can not be called concurrently, so locking is not
+// required when implementing an Aggregator plugin.
+type Aggregator interface {
+	// SampleConfig returns the default configuration of the Input.
+	SampleConfig() string
+
+	// Description returns a one-sentence description on the Input.
+	Description() string
+
+	// Add the metric to the aggregator.
+	Add(in Metric)
+
+	// Push pushes the current aggregates to the accumulator.
+	Push(acc Accumulator)
+
+	// Reset resets the aggregators caches and aggregates.
+	Reset()
+}

circle.yml

@@ -0,0 +1,18 @@
+machine:
+  services:
+    - docker
+  post:
+    - sudo service zookeeper stop
+    - go version
+    - go version | grep 1.7.4 || sudo rm -rf /usr/local/go
+    - wget https://storage.googleapis.com/golang/go1.7.4.linux-amd64.tar.gz
+    - sudo tar -C /usr/local -xzf go1.7.4.linux-amd64.tar.gz
+    - go version
+
+dependencies:
+  override:
+    - docker info
+
+test:
+  override:
+    - bash scripts/circle-test.sh

cmd/telegraf/telegraf.go

@@ -6,103 +6,339 @@ import (
 	"log"
 	"os"
 	"os/signal"
+	"runtime"
 	"strings"
+	"syscall"
 
-	"github.com/influxdb/telegraf"
-	_ "github.com/influxdb/telegraf/plugins/all"
+	"github.com/influxdata/telegraf/agent"
+	"github.com/influxdata/telegraf/internal/config"
+	"github.com/influxdata/telegraf/logger"
+	_ "github.com/influxdata/telegraf/plugins/aggregators/all"
+	"github.com/influxdata/telegraf/plugins/inputs"
+	_ "github.com/influxdata/telegraf/plugins/inputs/all"
+	"github.com/influxdata/telegraf/plugins/outputs"
+	_ "github.com/influxdata/telegraf/plugins/outputs/all"
+	_ "github.com/influxdata/telegraf/plugins/processors/all"
+	"github.com/kardianos/service"
 )
 
-var fDebug = flag.Bool("debug", false, "show metrics as they're generated to stdout")
+var fDebug = flag.Bool("debug", false,
+	"turn on debug logging")
+var fQuiet = flag.Bool("quiet", false,
+	"run in quiet mode")
 var fTest = flag.Bool("test", false, "gather metrics, print them out, and exit")
 var fConfig = flag.String("config", "", "configuration file to load")
+var fConfigDirectory = flag.String("config-directory", "",
+	"directory containing additional *.conf files")
 var fVersion = flag.Bool("version", false, "display the version")
-var fSampleConfig = flag.Bool("sample-config", false, "print out full sample configuration")
+var fSampleConfig = flag.Bool("sample-config", false,
+	"print out full sample configuration")
+var fPidfile = flag.String("pidfile", "", "file to write our pid to")
+var fInputFilters = flag.String("input-filter", "",
+	"filter the inputs to enable, separator is :")
+var fInputList = flag.Bool("input-list", false,
+	"print available input plugins.")
+var fOutputFilters = flag.String("output-filter", "",
+	"filter the outputs to enable, separator is :")
+var fOutputList = flag.Bool("output-list", false,
+	"print available output plugins.")
+var fAggregatorFilters = flag.String("aggregator-filter", "",
+	"filter the aggregators to enable, separator is :")
+var fProcessorFilters = flag.String("processor-filter", "",
+	"filter the processors to enable, separator is :")
+var fUsage = flag.String("usage", "",
+	"print usage for a plugin, ie, 'telegraf -usage mysql'")
+var fService = flag.String("service", "",
+	"operate on the service")
 
-var Version = "unreleased"
+// Telegraf version, populated linker.
+//   ie, -ldflags "-X main.version=`git describe --always --tags`"
+var (
+	version string
+	commit  string
+	branch  string
+)
+
+func init() {
+	// If commit or branch are not set, make that clear.
+	if commit == "" {
+		commit = "unknown"
+	}
+	if branch == "" {
+		branch = "unknown"
+	}
+}
+
+const usage = `Telegraf, The plugin-driven server agent for collecting and reporting metrics.
+
+Usage:
+
+  telegraf [commands|flags]
+
+The commands & flags are:
+
+  config             print out full sample configuration to stdout
+  version            print the version to stdout
+
+  --config <file>     configuration file to load
+  --test              gather metrics once, print them to stdout, and exit
+  --config-directory  directory containing additional *.conf files
+  --input-filter      filter the input plugins to enable, separator is :
+  --output-filter     filter the output plugins to enable, separator is :
+  --usage             print usage for a plugin, ie, 'telegraf --usage mysql'
+  --debug             print metrics as they're generated to stdout
+  --quiet             run in quiet mode
+
+Examples:
+
+  # generate a telegraf config file:
+  telegraf config > telegraf.conf
+
+  # generate config with only cpu input & influxdb output plugins defined
+  telegraf --input-filter cpu --output-filter influxdb config
+
+  # run a single telegraf collection, outputing metrics to stdout
+  telegraf --config telegraf.conf -test
+
+  # run telegraf with all plugins defined in config file
+  telegraf --config telegraf.conf
+
+  # run telegraf, enabling the cpu & memory input, and influxdb output plugins
+  telegraf --config telegraf.conf --input-filter cpu:mem --output-filter influxdb
+`
+
+var stop chan struct{}
+
+var srvc service.Service
+
+type program struct{}
+
+func reloadLoop(stop chan struct{}, s service.Service) {
+	defer func() {
+		if service.Interactive() {
+			os.Exit(0)
+		}
+		return
+	}()
+	reload := make(chan bool, 1)
+	reload <- true
+	for <-reload {
+		reload <- false
+		flag.Parse()
+		args := flag.Args()
+
+		var inputFilters []string
+		if *fInputFilters != "" {
+			inputFilter := strings.TrimSpace(*fInputFilters)
+			inputFilters = strings.Split(":"+inputFilter+":", ":")
+		}
+		var outputFilters []string
+		if *fOutputFilters != "" {
+			outputFilter := strings.TrimSpace(*fOutputFilters)
+			outputFilters = strings.Split(":"+outputFilter+":", ":")
+		}
+		var aggregatorFilters []string
+		if *fAggregatorFilters != "" {
+			aggregatorFilter := strings.TrimSpace(*fAggregatorFilters)
+			aggregatorFilters = strings.Split(":"+aggregatorFilter+":", ":")
+		}
+		var processorFilters []string
+		if *fProcessorFilters != "" {
+			processorFilter := strings.TrimSpace(*fProcessorFilters)
+			processorFilters = strings.Split(":"+processorFilter+":", ":")
+		}
+
+		if len(args) > 0 {
+			switch args[0] {
+			case "version":
+				fmt.Printf("Telegraf v%s (git: %s %s)\n", version, branch, commit)
+				return
+			case "config":
+				config.PrintSampleConfig(
+					inputFilters,
+					outputFilters,
+					aggregatorFilters,
+					processorFilters,
+				)
+				return
+			}
+		}
+
+		// switch for flags which just do something and exit immediately
+		switch {
+		case *fOutputList:
+			fmt.Println("Available Output Plugins:")
+			for k, _ := range outputs.Outputs {
+				fmt.Printf("  %s\n", k)
+			}
+			return
+		case *fInputList:
+			fmt.Println("Available Input Plugins:")
+			for k, _ := range inputs.Inputs {
+				fmt.Printf("  %s\n", k)
+			}
+			return
+		case *fVersion:
+			fmt.Printf("Telegraf v%s (git: %s %s)\n", version, branch, commit)
+			return
+		case *fSampleConfig:
+			config.PrintSampleConfig(
+				inputFilters,
+				outputFilters,
+				aggregatorFilters,
+				processorFilters,
+			)
+			return
+		case *fUsage != "":
+			if err := config.PrintInputConfig(*fUsage); err != nil {
+				if err2 := config.PrintOutputConfig(*fUsage); err2 != nil {
+					log.Fatalf("E! %s and %s", err, err2)
+				}
+			}
+			return
+		}
+
+		// If no other options are specified, load the config file and run.
+		c := config.NewConfig()
+		c.OutputFilters = outputFilters
+		c.InputFilters = inputFilters
+		err := c.LoadConfig(*fConfig)
+		if err != nil {
+			log.Fatal("E! " + err.Error())
+		}
+
+		if *fConfigDirectory != "" {
+			err = c.LoadDirectory(*fConfigDirectory)
+			if err != nil {
+				log.Fatal("E! " + err.Error())
+			}
+		}
+		if len(c.Outputs) == 0 {
+			log.Fatalf("E! Error: no outputs found, did you provide a valid config file?")
+		}
+		if len(c.Inputs) == 0 {
+			log.Fatalf("E! Error: no inputs found, did you provide a valid config file?")
+		}
+
+		ag, err := agent.NewAgent(c)
+		if err != nil {
+			log.Fatal("E! " + err.Error())
+		}
+
+		// Setup logging
+		logger.SetupLogging(
+			ag.Config.Agent.Debug || *fDebug,
+			ag.Config.Agent.Quiet || *fQuiet,
+			ag.Config.Agent.Logfile,
+		)
+
+		if *fTest {
+			err = ag.Test()
+			if err != nil {
+				log.Fatal("E! " + err.Error())
+			}
+			return
+		}
+
+		err = ag.Connect()
+		if err != nil {
+			log.Fatal("E! " + err.Error())
+		}
+
+		shutdown := make(chan struct{})
+		signals := make(chan os.Signal)
+		signal.Notify(signals, os.Interrupt, syscall.SIGHUP)
+		go func() {
+			select {
+			case sig := <-signals:
+				if sig == os.Interrupt {
+					close(shutdown)
+				}
+				if sig == syscall.SIGHUP {
+					log.Printf("I! Reloading Telegraf config\n")
+					<-reload
+					reload <- true
+					close(shutdown)
+				}
+			case <-stop:
+				close(shutdown)
+			}
+		}()
+
+		log.Printf("I! Starting Telegraf (version %s)\n", version)
+		log.Printf("I! Loaded outputs: %s", strings.Join(c.OutputNames(), " "))
+		log.Printf("I! Loaded inputs: %s", strings.Join(c.InputNames(), " "))
+		log.Printf("I! Tags enabled: %s", c.ListTags())
+
+		if *fPidfile != "" {
+			f, err := os.Create(*fPidfile)
+			if err != nil {
+				log.Fatalf("E! Unable to create pidfile: %s", err)
+			}
+
+			fmt.Fprintf(f, "%d\n", os.Getpid())
+
+			f.Close()
+		}
+
+		ag.Run(shutdown)
+	}
+}
+
+func usageExit(rc int) {
+	fmt.Println(usage)
+	os.Exit(rc)
+}
+
+func (p *program) Start(s service.Service) error {
+	srvc = s
+	go p.run()
+	return nil
+}
+func (p *program) run() {
+	stop = make(chan struct{})
+	reloadLoop(stop, srvc)
+}
+func (p *program) Stop(s service.Service) error {
+	close(stop)
+	return nil
+}
 
 func main() {
+	flag.Usage = func() { usageExit(0) }
 	flag.Parse()
+	if runtime.GOOS == "windows" {
+		svcConfig := &service.Config{
+			Name:        "telegraf",
+			DisplayName: "Telegraf Data Collector Service",
+			Description: "Collects data using a series of plugins and publishes it to" +
+				"another series of plugins.",
+			Arguments: []string{"-config", "C:\\Program Files\\Telegraf\\telegraf.conf"},
+		}
 
-	if *fVersion {
-		fmt.Printf("InfluxDB Telegraf agent - Version %s\n", Version)
-		return
-	}
-
-	if *fSampleConfig {
-		telegraf.PrintSampleConfig()
-		return
-	}
-
-	var (
-		config *telegraf.Config
-		err    error
-	)
-
-	if *fConfig != "" {
-		config, err = telegraf.LoadConfig(*fConfig)
+		prg := &program{}
+		s, err := service.New(prg, svcConfig)
 		if err != nil {
-			log.Fatal(err)
+			log.Fatal("E! " + err.Error())
+		}
+		// Handle the -service flag here to prevent any issues with tooling that
+		// may not have an interactive session, e.g. installing from Ansible.
+		if *fService != "" {
+			if *fConfig != "" {
+				(*svcConfig).Arguments = []string{"-config", *fConfig}
+			}
+			err := service.Control(s, *fService)
+			if err != nil {
+				log.Fatal("E! " + err.Error())
+			}
+		} else {
+			err = s.Run()
+			if err != nil {
+				log.Println("E! " + err.Error())
+			}
 		}
 	} else {
-		config = telegraf.DefaultConfig()
+		stop = make(chan struct{})
+		reloadLoop(stop, nil)
 	}
-
-	ag, err := telegraf.NewAgent(config)
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	if *fDebug {
-		ag.Debug = true
-	}
-
-	plugins, err := ag.LoadPlugins()
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	if *fTest {
-		if *fConfig != "" {
-			err = ag.Test()
-		} else {
-			err = ag.TestAllPlugins()
-		}
-
-		if err != nil {
-			log.Fatal(err)
-		}
-
-		return
-	}
-
-	err = ag.Connect()
-	if err != nil {
-		log.Fatal(err)
-	}
-
-	shutdown := make(chan struct{})
-
-	signals := make(chan os.Signal)
-
-	signal.Notify(signals, os.Interrupt)
-
-	go func() {
-		<-signals
-		close(shutdown)
-	}()
-
-	log.Print("InfluxDB Agent running")
-	log.Printf("Loaded plugins: %s", strings.Join(plugins, " "))
-	if ag.Debug {
-		log.Printf("Debug: enabled")
-		log.Printf("Agent Config: Interval:%s, Debug:%#v, Hostname:%#v\n",
-			ag.Interval, ag.Debug, ag.Hostname)
-	}
-
-	if config.URL != "" {
-		log.Printf("Sending metrics to: %s", config.URL)
-		log.Printf("Tags enabled: %v", config.ListTags())
-	}
-
-	ag.Run(shutdown)
 }

config.go

@@ -1,302 +0,0 @@
-package telegraf
-
-import (
-	"errors"
-	"fmt"
-	"io/ioutil"
-	"sort"
-	"strings"
-	"time"
-
-	"github.com/influxdb/telegraf/plugins"
-	"github.com/naoina/toml"
-	"github.com/naoina/toml/ast"
-)
-
-type Duration struct {
-	time.Duration
-}
-
-func (d *Duration) UnmarshalTOML(b []byte) error {
-	dur, err := time.ParseDuration(string(b[1 : len(b)-1]))
-	if err != nil {
-		return err
-	}
-
-	d.Duration = dur
-
-	return nil
-}
-
-type Config struct {
-	URL       string
-	Username  string
-	Password  string
-	Database  string
-	UserAgent string
-	Tags      map[string]string
-
-	agent   *ast.Table
-	plugins map[string]*ast.Table
-}
-
-func (c *Config) Plugins() map[string]*ast.Table {
-	return c.plugins
-}
-
-type ConfiguredPlugin struct {
-	Name string
-
-	Drop []string
-	Pass []string
-
-	Interval time.Duration
-}
-
-func (cp *ConfiguredPlugin) ShouldPass(measurement string) bool {
-	if cp.Pass != nil {
-		for _, pat := range cp.Pass {
-			if strings.HasPrefix(measurement, pat) {
-				return true
-			}
-		}
-
-		return false
-	}
-
-	if cp.Drop != nil {
-		for _, pat := range cp.Drop {
-			if strings.HasPrefix(measurement, pat) {
-				return false
-			}
-		}
-
-		return true
-	}
-
-	return true
-}
-
-func (c *Config) ApplyAgent(v interface{}) error {
-	if c.agent != nil {
-		return toml.UnmarshalTable(c.agent, v)
-	}
-
-	return nil
-}
-
-func (c *Config) ApplyPlugin(name string, v interface{}) (*ConfiguredPlugin, error) {
-	cp := &ConfiguredPlugin{Name: name}
-
-	if tbl, ok := c.plugins[name]; ok {
-
-		if node, ok := tbl.Fields["pass"]; ok {
-			if kv, ok := node.(*ast.KeyValue); ok {
-				if ary, ok := kv.Value.(*ast.Array); ok {
-					for _, elem := range ary.Value {
-						if str, ok := elem.(*ast.String); ok {
-							cp.Pass = append(cp.Pass, str.Value)
-						}
-					}
-				}
-			}
-		}
-
-		if node, ok := tbl.Fields["drop"]; ok {
-			if kv, ok := node.(*ast.KeyValue); ok {
-				if ary, ok := kv.Value.(*ast.Array); ok {
-					for _, elem := range ary.Value {
-						if str, ok := elem.(*ast.String); ok {
-							cp.Drop = append(cp.Drop, str.Value)
-						}
-					}
-				}
-			}
-		}
-
-		if node, ok := tbl.Fields["interval"]; ok {
-			if kv, ok := node.(*ast.KeyValue); ok {
-				if str, ok := kv.Value.(*ast.String); ok {
-					dur, err := time.ParseDuration(str.Value)
-					if err != nil {
-						return nil, err
-					}
-
-					cp.Interval = dur
-				}
-			}
-		}
-
-		delete(tbl.Fields, "drop")
-		delete(tbl.Fields, "pass")
-		delete(tbl.Fields, "interval")
-		return cp, toml.UnmarshalTable(tbl, v)
-	}
-
-	return cp, nil
-}
-
-func (c *Config) PluginsDeclared() []string {
-	var plugins []string
-
-	for name, _ := range c.plugins {
-		plugins = append(plugins, name)
-	}
-
-	sort.Strings(plugins)
-
-	return plugins
-}
-
-func DefaultConfig() *Config {
-	return &Config{}
-}
-
-var ErrInvalidConfig = errors.New("invalid configuration")
-
-func LoadConfig(path string) (*Config, error) {
-	data, err := ioutil.ReadFile(path)
-	if err != nil {
-		return nil, err
-	}
-
-	tbl, err := toml.Parse(data)
-	if err != nil {
-		return nil, err
-	}
-
-	c := &Config{
-		plugins: make(map[string]*ast.Table),
-	}
-
-	for name, val := range tbl.Fields {
-		subtbl, ok := val.(*ast.Table)
-		if !ok {
-			return nil, ErrInvalidConfig
-		}
-
-		switch name {
-		case "influxdb":
-			err := toml.UnmarshalTable(subtbl, c)
-			if err != nil {
-				return nil, err
-			}
-		case "agent":
-			c.agent = subtbl
-		default:
-			c.plugins[name] = subtbl
-		}
-	}
-
-	return c, nil
-}
-
-func (c *Config) ListTags() string {
-	var tags []string
-
-	for k, v := range c.Tags {
-		tags = append(tags, fmt.Sprintf("%s=%s", k, v))
-	}
-
-	sort.Strings(tags)
-
-	return strings.Join(tags, " ")
-}
-
-type hasConfig interface {
-	BasicConfig() string
-}
-
-type hasDescr interface {
-	Description() string
-}
-
-var header = `# Telegraf configuration
-
-# If this file is missing an [agent] section, you must first generate a
-# valid config with 'telegraf -sample-config > telegraf.toml'
-
-# Telegraf is entirely plugin driven. All metrics are gathered from the
-# declared plugins.
-
-# Even if a plugin has no configuration, it must be declared in here
-# to be active. Declaring a plugin means just specifying the name
-# as a section with no variables. To deactivate a plugin, comment
-# out the name and any variables.
-
-# Use 'telegraf -config telegraf.toml -test' to see what metrics a config
-# file would generate.
-
-# One rule that plugins conform to is wherever a connection string
-# can be passed, the values '' and 'localhost' are treated specially.
-# They indicate to the plugin to use their own builtin configuration to
-# connect to the local system.
-
-# NOTE: The configuration has a few required parameters. They are marked
-# with 'required'. Be sure to edit those to make this configuration work.
-
-# Configuration for influxdb server to send metrics to
-[influxdb]
-# The full HTTP endpoint URL for your InfluxDB instance
-url = "http://localhost:8086" # required.
-
-# The target database for metrics. This database must already exist
-database = "telegraf" # required.
-
-# username = "telegraf"
-# password = "metricsmetricsmetricsmetrics"
-
-# Set the user agent for the POSTs (can be useful for log differentiation)
-# user_agent = "telegraf"
-# tags = { "dc": "us-east-1" }
-
-# Tags can also be specified via a normal map, but only one form at a time:
-
-# [influxdb.tags]
-# dc = "us-east-1"
-
-# Configuration for telegraf itself
-# [agent]
-# interval = "10s"
-# debug = false
-# hostname = "prod3241"
-
-# PLUGINS
-
-`
-
-func PrintSampleConfig() {
-	fmt.Printf(header)
-
-	var names []string
-
-	for name, _ := range plugins.Plugins {
-		names = append(names, name)
-	}
-
-	sort.Strings(names)
-
-	for _, name := range names {
-		creator := plugins.Plugins[name]
-
-		plugin := creator()
-
-		fmt.Printf("# %s\n[%s]\n", plugin.Description(), name)
-
-		var config string
-
-		config = strings.TrimSpace(plugin.SampleConfig())
-
-		if config == "" {
-			fmt.Printf("  # no configuration\n\n")
-		} else {
-			fmt.Printf("\n")
-			lines := strings.Split(config, "\n")
-			for _, line := range lines {
-				fmt.Printf("%s\n", line)
-			}
-
-			fmt.Printf("\n")
-		}
-	}
-}

docs/AGGREGATORS_AND_PROCESSORS.md

@@ -0,0 +1,59 @@
+# Telegraf Aggregator & Processor Plugins
+
+As of release 1.1.0, Telegraf has the concept of Aggregator and Processor Plugins.
+
+These plugins sit in-between Input & Output plugins, aggregating and processing
+metrics as they pass through Telegraf:
+
+```
+┌───────────┐
+│           │
+│    CPU    │───┐
+│           │   │
+└───────────┘   │
+                │
+┌───────────┐   │                                              ┌───────────┐
+│           │   │                                              │           │
+│  Memory   │───┤                                          ┌──▶│ InfluxDB  │
+│           │   │                                          │   │           │
+└───────────┘   │    ┌─────────────┐     ┌─────────────┐   │   └───────────┘
+                │    │             │     │Aggregate    │   │
+┌───────────┐   │    │Process      │     │ - mean      │   │   ┌───────────┐
+│           │   │    │ - transform │     │ - quantiles │   │   │           │
+│   MySQL   │───┼───▶│ - decorate  │────▶│ - min/max   │───┼──▶│   File    │
+│           │   │    │ - filter    │     │ - count     │   │   │           │
+└───────────┘   │    │             │     │             │   │   └───────────┘
+                │    └─────────────┘     └─────────────┘   │
+┌───────────┐   │                                          │   ┌───────────┐
+│           │   │                                          │   │           │
+│   SNMP    │───┤                                          └──▶│   Kafka   │
+│           │   │                                              │           │
+└───────────┘   │                                              └───────────┘
+                │
+┌───────────┐   │
+│           │   │
+│  Docker   │───┘
+│           │
+└───────────┘
+```
+
+Both Aggregators and Processors analyze metrics as they pass through Telegraf.
+
+**Processor** plugins process metrics as they pass through and immediately emit
+results based on the values they process. For example, this could be printing
+all metrics or adding a tag to all metrics that pass through.
+
+**Aggregator** plugins, on the other hand, are a bit more complicated. Aggregators
+are typically for emitting new _aggregate_ metrics, such as a running mean,
+minimum, maximum, quantiles, or standard deviation. For this reason, all _aggregator_
+plugins are configured with a `period`. The `period` is the size of the window
+of metrics that each _aggregate_ represents. In other words, the emitted
+_aggregate_ metric will be the aggregated value of the past `period` seconds.
+Since many users will only care about their aggregates and not every single metric
+gathered, there is also a `drop_original` argument, which tells Telegraf to only
+emit the aggregates and not the original metrics.
+
+**NOTE** That since aggregators only aggregate metrics within their period, that
+historical data is not supported. In other words, if your metric timestamp is more
+than `now() - period` in the past, it will not be aggregated. If this is a feature
+that you need, please comment on this [github issue](https://github.com/influxdata/telegraf/issues/1992)

docs/CONFIGURATION.md

@@ -0,0 +1,354 @@
+# Telegraf Configuration
+
+You can see the latest config file with all available plugins here:
+[telegraf.conf](https://github.com/influxdata/telegraf/blob/master/etc/telegraf.conf)
+
+## Generating a Configuration File
+
+A default Telegraf config file can be auto-generated by telegraf:
+
+```
+telegraf config > telegraf.conf
+```
+
+To generate a file with specific inputs and outputs, you can use the
+--input-filter and --output-filter flags:
+
+```
+telegraf --input-filter cpu:mem:net:swap --output-filter influxdb:kafka config
+```
+
+## Environment Variables
+
+Environment variables can be used anywhere in the config file, simply prepend
+them with $. For strings the variable must be within quotes (ie, "$STR_VAR"),
+for numbers and booleans they should be plain (ie, $INT_VAR, $BOOL_VAR)
+
+# Global Tags
+
+Global tags can be specified in the `[global_tags]` section of the config file
+in key="value" format. All metrics being gathered on this host will be tagged
+with the tags specified here.
+
+## Agent Configuration
+
+Telegraf has a few options you can configure under the `[agent]` section of the
+config.
+
+* **interval**: Default data collection interval for all inputs
+* **round_interval**: Rounds collection interval to 'interval'
+ie, if interval="10s" then always collect on :00, :10, :20, etc.
+* **metric_batch_size**: Telegraf will send metrics to output in batch of at
+most metric_batch_size metrics.
+* **metric_buffer_limit**: Telegraf will cache metric_buffer_limit metrics
+for each output, and will flush this buffer on a successful write.
+This should be a multiple of metric_batch_size and could not be less
+than 2 times metric_batch_size.
+* **collection_jitter**: Collection jitter is used to jitter
+the collection by a random amount.
+Each plugin will sleep for a random time within jitter before collecting.
+This can be used to avoid many plugins querying things like sysfs at the
+same time, which can have a measurable effect on the system.
+* **flush_interval**: Default data flushing interval for all outputs.
+You should not set this below
+interval. Maximum flush_interval will be flush_interval + flush_jitter
+* **flush_jitter**: Jitter the flush interval by a random amount.
+This is primarily to avoid
+large write spikes for users running a large number of telegraf instances.
+ie, a jitter of 5s and flush_interval 10s means flushes will happen every 10-15s.
+* **precision**: By default, precision will be set to the same timestamp order
+as the collection interval, with the maximum being 1s. Precision will NOT
+be used for service inputs, such as logparser and statsd. Valid values are
+"ns", "us" (or "µs"), "ms", "s".
+* **logfile**: Specify the log file name. The empty string means to log to stdout.
+* **debug**: Run telegraf in debug mode.
+* **quiet**: Run telegraf in quiet mode (error messages only).
+* **hostname**: Override default hostname, if empty use os.Hostname().
+* **omit_hostname**: If true, do no set the "host" tag in the telegraf agent.
+
+## Input Configuration
+
+The following config parameters are available for all inputs:
+
+* **interval**: How often to gather this metric. Normal plugins use a single
+global interval, but if one particular input should be run less or more often,
+you can configure that here.
+* **name_override**: Override the base name of the measurement.
+(Default is the name of the input).
+* **name_prefix**: Specifies a prefix to attach to the measurement name.
+* **name_suffix**: Specifies a suffix to attach to the measurement name.
+* **tags**: A map of tags to apply to a specific input's measurements.
+
+## Output Configuration
+
+There are no generic configuration options available for all outputs.
+
+## Aggregator Configuration
+
+The following config parameters are available for all aggregators:
+
+* **period**: The period on which to flush & clear each aggregator. All metrics
+that are sent with timestamps outside of this period will be ignored by the
+aggregator.
+* **delay**: The delay before each aggregator is flushed. This is to control
+how long for aggregators to wait before receiving metrics from input plugins,
+in the case that aggregators are flushing and inputs are gathering on the
+same interval.
+* **drop_original**: If true, the original metric will be dropped by the
+aggregator and will not get sent to the output plugins.
+* **name_override**: Override the base name of the measurement.
+(Default is the name of the input).
+* **name_prefix**: Specifies a prefix to attach to the measurement name.
+* **name_suffix**: Specifies a suffix to attach to the measurement name.
+* **tags**: A map of tags to apply to a specific input's measurements.
+
+## Processor Configuration
+
+The following config parameters are available for all processors:
+
+* **order**: This is the order in which the processor(s) get executed. If this
+is not specified then processor execution order will be random.
+
+#### Measurement Filtering
+
+Filters can be configured per input, output, processor, or aggregator,
+see below for examples.
+
+* **namepass**: An array of strings that is used to filter metrics generated by the
+current input. Each string in the array is tested as a glob match against
+measurement names and if it matches, the field is emitted.
+* **namedrop**: The inverse of pass, if a measurement name matches, it is not emitted.
+* **fieldpass**: An array of strings that is used to filter metrics generated by the
+current input. Each string in the array is tested as a glob match against field names
+and if it matches, the field is emitted. fieldpass is not available for outputs.
+* **fielddrop**: The inverse of pass, if a field name matches, it is not emitted.
+fielddrop is not available for outputs.
+* **tagpass**: tag names and arrays of strings that are used to filter
+measurements by the current input. Each string in the array is tested as a glob
+match against the tag name, and if it matches the measurement is emitted.
+* **tagdrop**: The inverse of tagpass. If a tag matches, the measurement is not
+emitted. This is tested on measurements that have passed the tagpass test.
+* **tagexclude**: tagexclude can be used to exclude a tag from measurement(s).
+As opposed to tagdrop, which will drop an entire measurement based on it's
+tags, tagexclude simply strips the given tag keys from the measurement. This
+can be used on inputs & outputs, but it is _recommended_ to be used on inputs,
+as it is more efficient to filter out tags at the ingestion point.
+* **taginclude**: taginclude is the inverse of tagexclude. It will only include
+the tag keys in the final measurement.
+
+**NOTE** `tagpass` and `tagdrop` parameters must be defined at the _end_ of
+the plugin definition, otherwise subsequent plugin config options will be
+interpreted as part of the tagpass/tagdrop map.
+
+#### Input Configuration Examples
+
+This is a full working config that will output CPU data to an InfluxDB instance
+at 192.168.59.103:8086, tagging measurements with dc="denver-1". It will output
+measurements at a 10s interval and will collect per-cpu data, dropping any
+fields which begin with `time_`.
+
+```toml
+[global_tags]
+  dc = "denver-1"
+
+[agent]
+  interval = "10s"
+
+# OUTPUTS
+[[outputs.influxdb]]
+  url = "http://192.168.59.103:8086" # required.
+  database = "telegraf" # required.
+  precision = "s"
+
+# INPUTS
+[[inputs.cpu]]
+  percpu = true
+  totalcpu = false
+  # filter all fields beginning with 'time_'
+  fielddrop = ["time_*"]
+```
+
+#### Input Config: tagpass and tagdrop
+
+**NOTE** `tagpass` and `tagdrop` parameters must be defined at the _end_ of
+the plugin definition, otherwise subsequent plugin config options will be
+interpreted as part of the tagpass/tagdrop map.
+
+```toml
+[[inputs.cpu]]
+  percpu = true
+  totalcpu = false
+  fielddrop = ["cpu_time"]
+  # Don't collect CPU data for cpu6 & cpu7
+  [inputs.cpu.tagdrop]
+    cpu = [ "cpu6", "cpu7" ]
+
+[[inputs.disk]]
+  [inputs.disk.tagpass]
+    # tagpass conditions are OR, not AND.
+    # If the (filesystem is ext4 or xfs) OR (the path is /opt or /home)
+    # then the metric passes
+    fstype = [ "ext4", "xfs" ]
+    # Globs can also be used on the tag values
+    path = [ "/opt", "/home*" ]
+```
+
+#### Input Config: fieldpass and fielddrop
+
+```toml
+# Drop all metrics for guest & steal CPU usage
+[[inputs.cpu]]
+  percpu = false
+  totalcpu = true
+  fielddrop = ["usage_guest", "usage_steal"]
+
+# Only store inode related metrics for disks
+[[inputs.disk]]
+  fieldpass = ["inodes*"]
+```
+
+#### Input Config: namepass and namedrop
+
+```toml
+# Drop all metrics about containers for kubelet
+[[inputs.prometheus]]
+  urls = ["http://kube-node-1:4194/metrics"]
+  namedrop = ["container_*"]
+
+# Only store rest client related metrics for kubelet
+[[inputs.prometheus]]
+  urls = ["http://kube-node-1:4194/metrics"]
+  namepass = ["rest_client_*"]
+```
+
+#### Input Config: taginclude and tagexclude
+
+```toml
+# Only include the "cpu" tag in the measurements for the cpu plugin.
+[[inputs.cpu]]
+  percpu = true
+  totalcpu = true
+  taginclude = ["cpu"]
+
+# Exclude the "fstype" tag from the measurements for the disk plugin.
+[[inputs.disk]]
+  tagexclude = ["fstype"]
+```
+
+#### Input config: prefix, suffix, and override
+
+This plugin will emit measurements with the name `cpu_total`
+
+```toml
+[[inputs.cpu]]
+  name_suffix = "_total"
+  percpu = false
+  totalcpu = true
+```
+
+This will emit measurements with the name `foobar`
+
+```toml
+[[inputs.cpu]]
+  name_override = "foobar"
+  percpu = false
+  totalcpu = true
+```
+
+#### Input config: tags
+
+This plugin will emit measurements with two additional tags: `tag1=foo` and
+`tag2=bar`
+
+NOTE: Order matters, the `[inputs.cpu.tags]` table must be at the _end_ of the
+plugin definition.
+
+```toml
+[[inputs.cpu]]
+  percpu = false
+  totalcpu = true
+  [inputs.cpu.tags]
+    tag1 = "foo"
+    tag2 = "bar"
+```
+
+#### Multiple inputs of the same type
+
+Additional inputs (or outputs) of the same type can be specified,
+just define more instances in the config file. It is highly recommended that
+you utilize `name_override`, `name_prefix`, or `name_suffix` config options
+to avoid measurement collisions:
+
+```toml
+[[inputs.cpu]]
+  percpu = false
+  totalcpu = true
+
+[[inputs.cpu]]
+  percpu = true
+  totalcpu = false
+  name_override = "percpu_usage"
+  fielddrop = ["cpu_time*"]
+```
+
+#### Output Configuration Examples:
+
+```toml
+[[outputs.influxdb]]
+  urls = [ "http://localhost:8086" ]
+  database = "telegraf"
+  precision = "s"
+  # Drop all measurements that start with "aerospike"
+  namedrop = ["aerospike*"]
+
+[[outputs.influxdb]]
+  urls = [ "http://localhost:8086" ]
+  database = "telegraf-aerospike-data"
+  precision = "s"
+  # Only accept aerospike data:
+  namepass = ["aerospike*"]
+
+[[outputs.influxdb]]
+  urls = [ "http://localhost:8086" ]
+  database = "telegraf-cpu0-data"
+  precision = "s"
+  # Only store measurements where the tag "cpu" matches the value "cpu0"
+  [outputs.influxdb.tagpass]
+    cpu = ["cpu0"]
+```
+
+#### Aggregator Configuration Examples:
+
+This will collect and emit the min/max of the system load1 metric every
+30s, dropping the originals.
+
+```toml
+[[inputs.system]]
+  fieldpass = ["load1"] # collects system load1 metric.
+
+[[aggregators.minmax]]
+  period = "30s"        # send & clear the aggregate every 30s.
+  drop_original = true  # drop the original metrics.
+
+[[outputs.file]]
+  files = ["stdout"]
+```
+
+This will collect and emit the min/max of the swap metrics every
+30s, dropping the originals. The aggregator will not be applied
+to the system load metrics due to the `namepass` parameter.
+
+```toml
+[[inputs.swap]]
+
+[[inputs.system]]
+  fieldpass = ["load1"] # collects system load1 metric.
+
+[[aggregators.minmax]]
+  period = "30s"        # send & clear the aggregate every 30s.
+  drop_original = true  # drop the original metrics.
+  namepass = ["swap"]   # only "pass" swap metrics through the aggregator.
+
+[[outputs.file]]
+  files = ["stdout"]
+```

docs/DATA_FORMATS_INPUT.md

@@ -0,0 +1,440 @@
+# Telegraf Input Data Formats
+
+Telegraf is able to parse the following input data formats into metrics:
+
+1. [InfluxDB Line Protocol](https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md#influx)
+1. [JSON](https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md#json)
+1. [Graphite](https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md#graphite)
+1. [Value](https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md#value), ie: 45 or "booyah"
+1. [Nagios](https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md#nagios) (exec input only)
+
+Telegraf metrics, like InfluxDB
+[points](https://docs.influxdata.com/influxdb/v0.10/write_protocols/line/),
+are a combination of four basic parts:
+
+1. Measurement Name
+1. Tags
+1. Fields
+1. Timestamp
+
+These four parts are easily defined when using InfluxDB line-protocol as a
+data format. But there are other data formats that users may want to use which
+require more advanced configuration to create usable Telegraf metrics.
+
+Plugins such as `exec` and `kafka_consumer` parse textual data. Up until now,
+these plugins were statically configured to parse just a single
+data format. `exec` mostly only supported parsing JSON, and `kafka_consumer` only
+supported data in InfluxDB line-protocol.
+
+But now we are normalizing the parsing of various data formats across all
+plugins that can support it. You will be able to identify a plugin that supports
+different data formats by the presence of a `data_format` config option, for
+example, in the exec plugin:
+
+```toml
+[[inputs.exec]]
+  ## Commands array
+  commands = ["/tmp/test.sh", "/usr/bin/mycollector --foo=bar"]
+
+  ## measurement name suffix (for separating different commands)
+  name_suffix = "_mycollector"
+
+  ## Data format to consume.
+  ## Each data format has it's own unique set of configuration options, read
+  ## more about them here:
+  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
+  data_format = "json"
+
+  ## Additional configuration options go here
+```
+
+Each data_format has an additional set of configuration options available, which
+I'll go over below.
+
+# Influx:
+
+There are no additional configuration options for InfluxDB line-protocol. The
+metrics are parsed directly into Telegraf metrics.
+
+#### Influx Configuration:
+
+```toml
+[[inputs.exec]]
+  ## Commands array
+  commands = ["/tmp/test.sh", "/usr/bin/mycollector --foo=bar"]
+
+  ## measurement name suffix (for separating different commands)
+  name_suffix = "_mycollector"
+
+  ## Data format to consume.
+  ## Each data format has it's own unique set of configuration options, read
+  ## more about them here:
+  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
+  data_format = "influx"
+```
+
+# JSON:
+
+The JSON data format flattens JSON into metric _fields_.
+NOTE: Only numerical values are converted to fields, and they are converted
+into a float. strings are ignored unless specified as a tag_key (see below).
+
+So for example, this JSON:
+
+```json
+{
+    "a": 5,
+    "b": {
+        "c": 6
+    },
+    "ignored": "I'm a string"
+}
+```
+
+Would get translated into _fields_ of a measurement:
+
+```
+myjsonmetric a=5,b_c=6
+```
+
+The _measurement_ _name_ is usually the name of the plugin,
+but can be overridden using the `name_override` config option.
+
+#### JSON Configuration:
+
+The JSON data format supports specifying "tag keys". If specified, keys
+will be searched for in the root-level of the JSON blob. If the key(s) exist,
+they will be applied as tags to the Telegraf metrics.
+
+For example, if you had this configuration:
+
+```toml
+[[inputs.exec]]
+  ## Commands array
+  commands = ["/tmp/test.sh", "/usr/bin/mycollector --foo=bar"]
+
+  ## measurement name suffix (for separating different commands)
+  name_suffix = "_mycollector"
+
+  ## Data format to consume.
+  ## Each data format has it's own unique set of configuration options, read
+  ## more about them here:
+  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
+  data_format = "json"
+
+  ## List of tag names to extract from top-level of JSON server response
+  tag_keys = [
+    "my_tag_1",
+    "my_tag_2"
+  ]
+```
+
+with this JSON output from a command:
+
+```json
+{
+    "a": 5,
+    "b": {
+        "c": 6
+    },
+    "my_tag_1": "foo"
+}
+```
+
+Your Telegraf metrics would get tagged with "my_tag_1"
+
+```
+exec_mycollector,my_tag_1=foo a=5,b_c=6
+```
+
+If the JSON data is an array, then each element of the array is parsed with the configured settings.
+Each resulting metric will be output with the same timestamp.
+
+For example, if the following configuration:
+
+```toml
+[[inputs.exec]]
+  ## Commands array
+  commands = ["/usr/bin/mycollector --foo=bar"]
+
+  ## measurement name suffix (for separating different commands)
+  name_suffix = "_mycollector"
+
+  ## Data format to consume.
+  ## Each data format has it's own unique set of configuration options, read
+  ## more about them here:
+  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
+  data_format = "json"
+
+  ## List of tag names to extract from top-level of JSON server response
+  tag_keys = [
+    "my_tag_1",
+    "my_tag_2"
+  ]
+```
+
+with this JSON output from a command:
+
+```json
+[
+    {
+        "a": 5,
+        "b": {
+            "c": 6
+        },
+        "my_tag_1": "foo",
+        "my_tag_2": "baz"
+    },
+    {
+        "a": 7,
+        "b": {
+            "c": 8
+        },
+        "my_tag_1": "bar",
+        "my_tag_2": "baz"
+    }
+]
+```
+
+Your Telegraf metrics would get tagged with "my_tag_1" and "my_tag_2"
+
+```
+exec_mycollector,my_tag_1=foo,my_tag_2=baz a=5,b_c=6
+exec_mycollector,my_tag_1=bar,my_tag_2=baz a=7,b_c=8
+```
+
+# Value:
+
+The "value" data format translates single values into Telegraf metrics. This
+is done by assigning a measurement name and setting a single field ("value")
+as the parsed metric.
+
+#### Value Configuration:
+
+You **must** tell Telegraf what type of metric to collect by using the
+`data_type` configuration option. Available options are:
+
+1. integer
+2. float or long
+3. string
+4. boolean
+
+**Note:** It is also recommended that you set `name_override` to a measurement
+name that makes sense for your metric, otherwise it will just be set to the
+name of the plugin.
+
+```toml
+[[inputs.exec]]
+  ## Commands array
+  commands = ["cat /proc/sys/kernel/random/entropy_avail"]
+
+  ## override the default metric name of "exec"
+  name_override = "entropy_available"
+
+  ## Data format to consume.
+  ## Each data format has it's own unique set of configuration options, read
+  ## more about them here:
+  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
+  data_format = "value"
+  data_type = "integer" # required
+```
+
+# Graphite:
+
+The Graphite data format translates graphite _dot_ buckets directly into
+telegraf measurement names, with a single value field, and without any tags.
+By default, the separator is left as ".", but this can be changed using the
+"separator" argument. For more advanced options,
+Telegraf supports specifying "templates" to translate
+graphite buckets into Telegraf metrics.
+
+Templates are of the form:
+
+```
+"host.mytag.mytag.measurement.measurement.field*"
+```
+
+Where the following keywords exist:
+
+1. `measurement`: specifies that this section of the graphite bucket corresponds
+to the measurement name. This can be specified multiple times.
+2. `field`: specifies that this section of the graphite bucket corresponds
+to the field name. This can be specified multiple times.
+3. `measurement*`: specifies that all remaining elements of the graphite bucket
+correspond to the measurement name.
+4. `field*`: specifies that all remaining elements of the graphite bucket
+correspond to the field name.
+
+Any part of the template that is not a keyword is treated as a tag key. This
+can also be specified multiple times.
+
+NOTE: `field*` cannot be used in conjunction with `measurement*`!
+
+#### Measurement & Tag Templates:
+
+The most basic template is to specify a single transformation to apply to all
+incoming metrics. So the following template:
+
+```toml
+templates = [
+    "region.region.measurement*"
+]
+```
+
+would result in the following Graphite -> Telegraf transformation.
+
+```
+us.west.cpu.load 100
+=> cpu.load,region=us.west value=100
+```
+
+Multiple templates can also be specified, but these should be differentiated
+using _filters_ (see below for more details)
+
+```toml
+templates = [
+    "*.*.* region.region.measurement", # <- all 3-part measurements will match this one.
+    "*.*.*.* region.region.host.measurement", # <- all 4-part measurements will match this one.
+]
+```
+
+#### Field Templates:
+
+The field keyword tells Telegraf to give the metric that field name.
+So the following template:
+
+```toml
+separator = "_"
+templates = [
+    "measurement.measurement.field.field.region"
+]
+```
+
+would result in the following Graphite -> Telegraf transformation.
+
+```
+cpu.usage.idle.percent.eu-east 100
+=> cpu_usage,region=eu-east idle_percent=100
+```
+
+The field key can also be derived from all remaining elements of the graphite
+bucket by specifying `field*`:
+
+```toml
+separator = "_"
+templates = [
+    "measurement.measurement.region.field*"
+]
+```
+
+which would result in the following Graphite -> Telegraf transformation.
+
+```
+cpu.usage.eu-east.idle.percentage 100
+=> cpu_usage,region=eu-east idle_percentage=100
+```
+
+#### Filter Templates:
+
+Users can also filter the template(s) to use based on the name of the bucket,
+using glob matching, like so:
+
+```toml
+templates = [
+    "cpu.* measurement.measurement.region",
+    "mem.* measurement.measurement.host"
+]
+```
+
+which would result in the following transformation:
+
+```
+cpu.load.eu-east 100
+=> cpu_load,region=eu-east value=100
+
+mem.cached.localhost 256
+=> mem_cached,host=localhost value=256
+```
+
+#### Adding Tags:
+
+Additional tags can be added to a metric that don't exist on the received metric.
+You can add additional tags by specifying them after the pattern.
+Tags have the same format as the line protocol.
+Multiple tags are separated by commas.
+
+```toml
+templates = [
+    "measurement.measurement.field.region datacenter=1a"
+]
+```
+
+would result in the following Graphite -> Telegraf transformation.
+
+```
+cpu.usage.idle.eu-east 100
+=> cpu_usage,region=eu-east,datacenter=1a idle=100
+```
+
+There are many more options available,
+[More details can be found here](https://github.com/influxdata/influxdb/tree/master/services/graphite#templates)
+
+#### Graphite Configuration:
+
+```toml
+[[inputs.exec]]
+  ## Commands array
+  commands = ["/tmp/test.sh", "/usr/bin/mycollector --foo=bar"]
+
+  ## measurement name suffix (for separating different commands)
+  name_suffix = "_mycollector"
+
+  ## Data format to consume.
+  ## Each data format has it's own unique set of configuration options, read
+  ## more about them here:
+  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
+  data_format = "graphite"
+
+  ## This string will be used to join the matched values.
+  separator = "_"
+
+  ## Each template line requires a template pattern. It can have an optional
+  ## filter before the template and separated by spaces. It can also have optional extra
+  ## tags following the template. Multiple tags should be separated by commas and no spaces
+  ## similar to the line protocol format. There can be only one default template.
+  ## Templates support below format:
+  ## 1. filter + template
+  ## 2. filter + template + extra tag(s)
+  ## 3. filter + template with field key
+  ## 4. default template
+  templates = [
+    "*.app env.service.resource.measurement",
+    "stats.* .host.measurement* region=eu-east,agent=sensu",
+    "stats2.* .host.measurement.field",
+    "measurement*"
+  ]
+```
+
+# Nagios:
+
+There are no additional configuration options for Nagios line-protocol. The
+metrics are parsed directly into Telegraf metrics.
+
+Note: Nagios Input Data Formats is only supported in `exec` input plugin.
+
+#### Nagios Configuration:
+
+```toml
+[[inputs.exec]]
+  ## Commands array
+  commands = ["/usr/lib/nagios/plugins/check_load", "-w 5,6,7 -c 7,8,9"]
+
+  ## measurement name suffix (for separating different commands)
+  name_suffix = "_mycollector"
+
+  ## Data format to consume.
+  ## Each data format has it's own unique set of configuration options, read
+  ## more about them here:
+  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
+  data_format = "nagios"
+```

docs/DATA_FORMATS_OUTPUT.md

@@ -0,0 +1,150 @@
+# Telegraf Output Data Formats
+
+Telegraf is able to serialize metrics into the following output data formats:
+
+1. [InfluxDB Line Protocol](https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md#influx)
+1. [JSON](https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md#json)
+1. [Graphite](https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md#graphite)
+
+Telegraf metrics, like InfluxDB
+[points](https://docs.influxdata.com/influxdb/v0.10/write_protocols/line/),
+are a combination of four basic parts:
+
+1. Measurement Name
+1. Tags
+1. Fields
+1. Timestamp
+
+In InfluxDB line protocol, these 4 parts are easily defined in textual form:
+
+```
+measurement_name[,tag1=val1,...]  field1=val1[,field2=val2,...]  [timestamp]
+```
+
+For Telegraf outputs that write textual data (such as `kafka`, `mqtt`, and `file`),
+InfluxDB line protocol was originally the only available output format. But now
+we are normalizing telegraf metric "serializers" into a
+[plugin-like interface](https://github.com/influxdata/telegraf/tree/master/plugins/serializers)
+across all output plugins that can support it.
+You will be able to identify a plugin that supports different data formats
+by the presence of a `data_format`
+config option, for example, in the `file` output plugin:
+
+```toml
+[[outputs.file]]
+  ## Files to write to, "stdout" is a specially handled file.
+  files = ["stdout"]
+
+  ## Data format to output.
+  ## Each data format has it's own unique set of configuration options, read
+  ## more about them here:
+  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md
+  data_format = "influx"
+
+  ## Additional configuration options go here
+```
+
+Each data_format has an additional set of configuration options available, which
+I'll go over below.
+
+# Influx:
+
+There are no additional configuration options for InfluxDB line-protocol. The
+metrics are serialized directly into InfluxDB line-protocol.
+
+### Influx Configuration:
+
+```toml
+[[outputs.file]]
+  ## Files to write to, "stdout" is a specially handled file.
+  files = ["stdout", "/tmp/metrics.out"]
+
+  ## Data format to output.
+  ## Each data format has it's own unique set of configuration options, read
+  ## more about them here:
+  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md
+  data_format = "influx"
+```
+
+# Graphite:
+
+The Graphite data format translates Telegraf metrics into _dot_ buckets. A
+template can be specified for the output of Telegraf metrics into Graphite
+buckets. The default template is:
+
+```
+template = "host.tags.measurement.field"
+```
+
+In the above template, we have four parts:
+
+1. _host_ is a tag key. This can be any tag key that is in the Telegraf
+metric(s). If the key doesn't exist, it will be ignored. If it does exist, the
+tag value will be filled in.
+1. _tags_ is a special keyword that outputs all remaining tag values, separated
+by dots and in alphabetical order (by tag key). These will be filled after all
+tag keys are filled.
+1. _measurement_ is a special keyword that outputs the measurement name.
+1. _field_ is a special keyword that outputs the field name.
+
+Which means the following influx metric -> graphite conversion would happen:
+
+```
+cpu,cpu=cpu-total,dc=us-east-1,host=tars usage_idle=98.09,usage_user=0.89 1455320660004257758
+=>
+tars.cpu-total.us-east-1.cpu.usage_user 0.89 1455320690
+tars.cpu-total.us-east-1.cpu.usage_idle 98.09 1455320690
+```
+
+### Graphite Configuration:
+
+```toml
+[[outputs.file]]
+  ## Files to write to, "stdout" is a specially handled file.
+  files = ["stdout", "/tmp/metrics.out"]
+
+  ## Data format to output.
+  ## Each data format has it's own unique set of configuration options, read
+  ## more about them here:
+  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md
+  data_format = "graphite"
+
+  # prefix each graphite bucket
+  prefix = "telegraf"
+  # graphite template
+  template = "host.tags.measurement.field"
+```
+
+# JSON:
+
+The JSON data format serialized Telegraf metrics in json format. The format is:
+
+```json
+{
+   "fields":{
+      "field_1":30,
+      "field_2":4,
+      "field_N":59,
+      "n_images":660
+   },
+   "name":"docker",
+   "tags":{
+      "host":"raynor"
+   },
+   "timestamp":1458229140
+}
+```
+
+### JSON Configuration:
+
+```toml
+[[outputs.file]]
+  ## Files to write to, "stdout" is a specially handled file.
+  files = ["stdout", "/tmp/metrics.out"]
+
+  ## Data format to output.
+  ## Each data format has it's own unique set of configuration options, read
+  ## more about them here:
+  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_OUTPUT.md
+  data_format = "json"
+```

docs/LICENSE_OF_DEPENDENCIES.md

@@ -0,0 +1,33 @@
+# List
+- github.com/Shopify/sarama [MIT LICENSE](https://github.com/Shopify/sarama/blob/master/MIT-LICENSE)
+- github.com/Sirupsen/logrus [MIT LICENSE](https://github.com/Sirupsen/logrus/blob/master/LICENSE)
+- github.com/armon/go-metrics [MIT LICENSE](https://github.com/armon/go-metrics/blob/master/LICENSE)
+- github.com/boltdb/bolt [MIT LICENSE](https://github.com/boltdb/bolt/blob/master/LICENSE)
+- github.com/cenkalti/backoff [MIT LICENSE](https://github.com/cenkalti/backoff/blob/master/LICENSE)
+- github.com/dancannon/gorethink [APACHE LICENSE](https://github.com/dancannon/gorethink/blob/master/LICENSE)
+- github.com/eapache/go-resiliency [MIT LICENSE](https://github.com/eapache/go-resiliency/blob/master/LICENSE)
+- github.com/eapache/queue [MIT LICENSE](https://github.com/eapache/queue/blob/master/LICENSE)
+- github.com/fsouza/go-dockerclient [BSD LICENSE](https://github.com/fsouza/go-dockerclient/blob/master/LICENSE)
+- github.com/go-sql-driver/mysql [MPL LICENSE](https://github.com/go-sql-driver/mysql/blob/master/LICENSE)
+- github.com/gogo/protobuf [BSD LICENSE](https://github.com/gogo/protobuf/blob/master/LICENSE)
+- github.com/golang/protobuf [BSD LICENSE](https://github.com/golang/protobuf/blob/master/LICENSE)
+- github.com/golang/snappy [BSD LICENSE](https://github.com/golang/snappy/blob/master/LICENSE)
+- github.com/hashicorp/go-msgpack [BSD LICENSE](https://github.com/hashicorp/go-msgpack/blob/master/LICENSE)
+- github.com/hashicorp/raft [MPL LICENSE](https://github.com/hashicorp/raft/blob/master/LICENSE)
+- github.com/hashicorp/raft-boltdb [MPL LICENSE](https://github.com/hashicorp/raft-boltdb/blob/master/LICENSE)
+- github.com/kardianos/service [ZLIB LICENSE](https://github.com/kardianos/service/blob/master/LICENSE) (License not named but matches word for word with ZLib)
+- github.com/kballard/go-shellquote [MIT LICENSE](https://github.com/kballard/go-shellquote/blob/master/LICENSE)
+- github.com/lib/pq [MIT LICENSE](https://github.com/lib/pq/blob/master/LICENSE.md)
+- github.com/matttproud/golang_protobuf_extensions [APACHE LICENSE](https://github.com/matttproud/golang_protobuf_extensions/blob/master/LICENSE)
+- github.com/naoina/go-stringutil [MIT LICENSE](https://github.com/naoina/go-stringutil/blob/master/LICENSE)
+- github.com/naoina/toml [MIT LICENSE](https://github.com/naoina/toml/blob/master/LICENSE)
+- github.com/prometheus/client_golang [APACHE LICENSE](https://github.com/prometheus/client_golang/blob/master/LICENSE)
+- github.com/samuel/go-zookeeper [BSD LICENSE](https://github.com/samuel/go-zookeeper/blob/master/LICENSE)
+- github.com/stretchr/objx [MIT LICENSE](github.com/stretchr/objx)
+- github.com/stretchr/testify [MIT LICENSE](https://github.com/stretchr/testify/blob/master/LICENCE.txt)
+- github.com/wvanbergen/kafka [MIT LICENSE](https://github.com/wvanbergen/kafka/blob/master/LICENSE)
+- github.com/wvanbergen/kazoo-go [MIT LICENSE](https://github.com/wvanbergen/kazoo-go/blob/master/MIT-LICENSE)
+- gopkg.in/dancannon/gorethink.v1 [APACHE LICENSE](https://github.com/dancannon/gorethink/blob/v1.1.2/LICENSE)
+- gopkg.in/mgo.v2 [BSD LICENSE](https://github.com/go-mgo/mgo/blob/v2/LICENSE)
+- golang.org/x/crypto/ [BSD LICENSE](https://github.com/golang/crypto/blob/master/LICENSE)
+

docs/WINDOWS_SERVICE.md

@@ -0,0 +1,39 @@
+# Running Telegraf as a Windows Service
+
+Telegraf natively supports running as a Windows Service. Outlined below is are
+the general steps to set it up.
+
+1. Obtain the telegraf windows distribution
+2. Create the directory `C:\Program Files\Telegraf` (if you install in a different
+   location simply specify the `-config` parameter with the desired location)
+3. Place the telegraf.exe and the telegraf.conf config file into `C:\Program Files\Telegraf`
+4. To install the service into the Windows Service Manager, run the following in PowerShell as an administrator (If necessary, you can wrap any spaces in the file paths in double quotes ""):
+
+   ```
+   > C:\"Program Files"\Telegraf\telegraf.exe --service install
+   ```
+
+5. Edit the configuration file to meet your needs
+6. To check that it works, run:
+
+   ```
+   > C:\"Program Files"\Telegraf\telegraf.exe --config C:\"Program Files"\Telegraf\telegraf.conf --test
+   ```
+
+7. To start collecting data, run:
+
+   ```
+   > net start telegraf
+   ```
+
+## Other supported operations
+
+Telegraf can manage its own service through the --service flag:
+
+| Command                            | Effect                        |
+|------------------------------------|-------------------------------|
+| `telegraf.exe --service install`   | Install telegraf as a service |
+| `telegraf.exe --service uninstall` | Remove the telegraf service   |
+| `telegraf.exe --service start`     | Start the telegraf service    |
+| `telegraf.exe --service stop`      | Stop the telegraf service     |
+

etc/config.sample.toml

@@ -1,134 +0,0 @@
-# Telegraf configuration
-
-# If this file is missing an [agent] section, you must first generate a
-# valid config with 'telegraf -sample-config > telegraf.toml'
-
-# Telegraf is entirely plugin driven. All metrics are gathered from the
-# declared plugins.
-
-# Even if a plugin has no configuration, it must be declared in here
-# to be active. Declaring a plugin means just specifying the name
-# as a section with no variables. To deactivate a plugin, comment
-# out the name and any variables.
-
-# Use 'telegraf -config telegraf.toml -test' to see what metrics a config
-# file would generate.
-
-# One rule that plugins conform to is wherever a connection string
-# can be passed, the values '' and 'localhost' are treated specially.
-# They indicate to the plugin to use their own builtin configuration to
-# connect to the local system.
-
-# NOTE: The configuration has a few required parameters. They are marked
-# with 'required'. Be sure to edit those to make this configuration work.
-
-# Configuration for influxdb server to send metrics to
-[influxdb]
-# The full HTTP endpoint URL for your InfluxDB instance
-url = "http://localhost:8086" # required.
-
-# The target database for metrics. This database must already exist
-database = "telegraf" # required.
-
-# username = "telegraf"
-# password = "metricsmetricsmetricsmetrics"
-
-# Set the user agent for the POSTs (can be useful for log differentiation)
-# user_agent = "telegraf"
-# tags = { "dc": "us-east-1" }
-
-# Tags can also be specified via a normal map, but only one form at a time:
-
-# [influxdb.tags]
-# dc = "us-east-1"
-
-# Configuration for telegraf itself
-# [agent]
-# interval = "10s"
-# debug = false
-# hostname = "prod3241"
-
-# PLUGINS
-
-# Read metrics about cpu usage
-[cpu]
-  # no configuration
-
-# Read metrics about disk usage by mount point
-[disk]
-  # no configuration
-
-# Read metrics about docker containers
-[docker]
-  # no configuration
-
-# Read metrics about disk IO by device
-[io]
-  # no configuration
-
-# Read metrics about memory usage
-[mem]
-  # no configuration
-
-# Read metrics from one or many mysql servers
-[mysql]
-
-# specify servers via a url matching:
-#  [username[:password]@][protocol[(address)]]/[?tls=[true|false|skip-verify]]
-#  e.g. root:root@http://10.0.0.18/?tls=false
-#
-# If no servers are specified, then localhost is used as the host.
-servers = ["localhost"]
-
-# Read metrics about network interface usage
-[net]
-
-# By default, telegraf gathers stats from any up interface (excluding loopback)
-# Setting interfaces will tell it to gather these explicit interfaces,
-# regardless of status.
-#
-# interfaces = ["eth0", ... ]
-
-# Read metrics from one or many postgresql servers
-[postgresql]
-
-# specify servers via an array of tables
-[[postgresql.servers]]
-
-# specify address via a url matching:
-#   postgres://[pqgotest[:password]]@localhost?sslmode=[disable|verify-ca|verify-full]
-# or a simple string:
-#   host=localhost user=pqotest password=... sslmode=...
-# 
-# All connection parameters are optional. By default, the host is localhost
-# and the user is the currently running user. For localhost, we default
-# to sslmode=disable as well.
-# 
-
-address = "sslmode=disable"
-
-# A list of databases to pull metrics about. If not specified, metrics for all
-# databases are gathered.
-
-# databases = ["app_production", "blah_testing"]
-
-# [[postgresql.servers]]
-# address = "influx@remoteserver"
-
-# Read metrics from one or many redis servers
-[redis]
-
-# An array of address to gather stats about. Specify an ip on hostname
-# with optional port. ie localhost, 10.10.3.33:18832, etc.
-#
-# If no servers are specified, then localhost is used as the host.
-servers = ["localhost"]
-
-# Read metrics about swap memory usage
-[swap]
-  # no configuration
-
-# Read metrics about system load
-[system]
-  # no configuration
-

etc/logrotate.d/telegraf

@@ -0,0 +1,11 @@
+/var/log/telegraf/telegraf.log 
+{
+    rotate 6
+    daily
+    missingok
+    dateext
+    copytruncate
+    notifempty
+    compress
+}
+

etc/telegraf_windows.conf

@@ -0,0 +1,203 @@
+# Telegraf configuration
+
+# Telegraf is entirely plugin driven. All metrics are gathered from the
+# declared inputs, and sent to the declared outputs.
+
+# Plugins must be declared in here to be active.
+# To deactivate a plugin, comment out the name and any variables.
+
+# Use 'telegraf -config telegraf.conf -test' to see what metrics a config
+# file would generate.
+
+# Global tags can be specified here in key="value" format.
+[global_tags]
+  # dc = "us-east-1" # will tag all metrics with dc=us-east-1
+  # rack = "1a"
+
+# Configuration for telegraf agent
+[agent]
+  ## Default data collection interval for all inputs
+  interval = "10s"
+  ## Rounds collection interval to 'interval'
+  ## ie, if interval="10s" then always collect on :00, :10, :20, etc.
+  round_interval = true
+
+  ## Telegraf will cache metric_buffer_limit metrics for each output, and will
+  ## flush this buffer on a successful write.
+  metric_buffer_limit = 1000
+  ## Flush the buffer whenever full, regardless of flush_interval.
+  flush_buffer_when_full = true
+
+  ## Collection jitter is used to jitter the collection by a random amount.
+  ## Each plugin will sleep for a random time within jitter before collecting.
+  ## This can be used to avoid many plugins querying things like sysfs at the
+  ## same time, which can have a measurable effect on the system.
+  collection_jitter = "0s"
+
+  ## Default flushing interval for all outputs. You shouldn't set this below
+  ## interval. Maximum flush_interval will be flush_interval + flush_jitter
+  flush_interval = "10s"
+  ## Jitter the flush interval by a random amount. This is primarily to avoid
+  ## large write spikes for users running a large number of telegraf instances.
+  ## ie, a jitter of 5s and interval 10s means flushes will happen every 10-15s
+  flush_jitter = "0s"
+
+  ## Logging configuration:
+  ## Run telegraf in debug mode
+  debug = false
+  ## Run telegraf in quiet mode
+  quiet = false
+  ## Specify the log file name. The empty string means to log to stdout.
+  logfile = "/Program Files/Telegraf/telegraf.log"
+
+  ## Override default hostname, if empty use os.Hostname()
+  hostname = ""
+
+
+###############################################################################
+#                                  OUTPUTS                                    #
+###############################################################################
+
+# Configuration for influxdb server to send metrics to
+[[outputs.influxdb]]
+  # The full HTTP or UDP endpoint URL for your InfluxDB instance.
+  # Multiple urls can be specified but it is assumed that they are part of the same
+  # cluster, this means that only ONE of the urls will be written to each interval.
+  # urls = ["udp://localhost:8089"] # UDP endpoint example
+  urls = ["http://localhost:8086"] # required
+  # The target database for metrics (telegraf will create it if not exists)
+  database = "telegraf" # required
+  # Precision of writes, valid values are "ns", "us" (or "µs"), "ms", "s", "m", "h".
+  # note: using second precision greatly helps InfluxDB compression
+  precision = "s"
+
+  ## Write timeout (for the InfluxDB client), formatted as a string.
+  ## If not provided, will default to 5s. 0s means no timeout (not recommended).
+  timeout = "5s"
+  # username = "telegraf"
+  # password = "metricsmetricsmetricsmetrics"
+  # Set the user agent for HTTP POSTs (can be useful for log differentiation)
+  # user_agent = "telegraf"
+  # Set UDP payload size, defaults to InfluxDB UDP Client default (512 bytes)
+  # udp_payload = 512
+
+
+###############################################################################
+#                                  INPUTS                                     #
+###############################################################################
+
+# Windows Performance Counters plugin.
+# These are the recommended method of monitoring system metrics on windows,
+# as the regular system plugins (inputs.cpu, inputs.mem, etc.) rely on WMI,
+# which utilize more system resources.
+#
+# See more configuration examples at:
+#   https://github.com/influxdata/telegraf/tree/master/plugins/inputs/win_perf_counters
+
+[[inputs.win_perf_counters]]
+  [[inputs.win_perf_counters.object]]
+    # Processor usage, alternative to native, reports on a per core.
+    ObjectName = "Processor"
+    Instances = ["*"]
+    Counters = [
+      "% Idle Time",
+      "% Interrupt Time",
+      "% Privileged Time",
+      "% User Time",
+      "% Processor Time",
+    ]
+    Measurement = "win_cpu"
+    # Set to true to include _Total instance when querying for all (*).
+    #IncludeTotal=false
+
+  [[inputs.win_perf_counters.object]]
+    # Disk times and queues
+    ObjectName = "LogicalDisk"
+    Instances = ["*"]
+    Counters = [
+      "% Idle Time",
+      "% Disk Time","% Disk Read Time",
+      "% Disk Write Time",
+      "% User Time",
+      "Current Disk Queue Length",
+    ]
+    Measurement = "win_disk"
+    # Set to true to include _Total instance when querying for all (*).
+    #IncludeTotal=false
+
+  [[inputs.win_perf_counters.object]]
+    ObjectName = "System"
+    Counters = [
+      "Context Switches/sec",
+      "System Calls/sec",
+      "Processor Queue Length",
+    ]
+    Instances = ["------"]
+    Measurement = "win_system"
+    # Set to true to include _Total instance when querying for all (*).
+    #IncludeTotal=false
+
+  [[inputs.win_perf_counters.object]]
+    # Example query where the Instance portion must be removed to get data back,
+    # such as from the Memory object.
+    ObjectName = "Memory"
+    Counters = [
+      "Available Bytes",
+      "Cache Faults/sec",
+      "Demand Zero Faults/sec",
+      "Page Faults/sec",
+      "Pages/sec",
+      "Transition Faults/sec",
+      "Pool Nonpaged Bytes",
+      "Pool Paged Bytes",
+    ]
+    # Use 6 x - to remove the Instance bit from the query.
+    Instances = ["------"]
+    Measurement = "win_mem"
+    # Set to true to include _Total instance when querying for all (*).
+    #IncludeTotal=false
+
+
+# Windows system plugins using WMI (disabled by default, using
+# win_perf_counters over WMI is recommended)
+
+# # Read metrics about cpu usage
+# [[inputs.cpu]]
+#   ## Whether to report per-cpu stats or not
+#   percpu = true
+#   ## Whether to report total system cpu stats or not
+#   totalcpu = true
+#   ## Comment this line if you want the raw CPU time metrics
+#   fielddrop = ["time_*"]
+
+
+# # Read metrics about disk usage by mount point
+# [[inputs.disk]]
+#   ## By default, telegraf gather stats for all mountpoints.
+#   ## Setting mountpoints will restrict the stats to the specified mountpoints.
+#   ## mount_points=["/"]
+#
+#   ## Ignore some mountpoints by filesystem type. For example (dev)tmpfs (usually
+#   ## present on /run, /var/run, /dev/shm or /dev).
+#   # ignore_fs = ["tmpfs", "devtmpfs"]
+
+
+# # Read metrics about disk IO by device
+# [[inputs.diskio]]
+#   ## By default, telegraf will gather stats for all devices including
+#   ## disk partitions.
+#   ## Setting devices will restrict the stats to the specified devices.
+#   ## devices = ["sda", "sdb"]
+#   ## Uncomment the following line if you do not need disk serial numbers.
+#   ## skip_serial_number = true
+
+
+# # Read metrics about memory usage
+# [[inputs.mem]]
+#   # no configuration
+
+
+# # Read metrics about swap memory usage
+# [[inputs.swap]]
+#   # no configuration
+

filter/filter.go

@@ -0,0 +1,79 @@
+package filter
+
+import (
+	"strings"
+
+	"github.com/gobwas/glob"
+)
+
+type Filter interface {
+	Match(string) bool
+}
+
+// Compile takes a list of string filters and returns a Filter interface
+// for matching a given string against the filter list. The filter list
+// supports glob matching too, ie:
+//
+//   f, _ := Compile([]string{"cpu", "mem", "net*"})
+//   f.Match("cpu")     // true
+//   f.Match("network") // true
+//   f.Match("memory")  // false
+//
+func Compile(filters []string) (Filter, error) {
+	// return if there is nothing to compile
+	if len(filters) == 0 {
+		return nil, nil
+	}
+
+	// check if we can compile a non-glob filter
+	noGlob := true
+	for _, filter := range filters {
+		if hasMeta(filter) {
+			noGlob = false
+			break
+		}
+	}
+
+	switch {
+	case noGlob:
+		// return non-globbing filter if not needed.
+		return compileFilterNoGlob(filters), nil
+	case len(filters) == 1:
+		return glob.Compile(filters[0])
+	default:
+		return glob.Compile("{" + strings.Join(filters, ",") + "}")
+	}
+}
+
+// hasMeta reports whether path contains any magic glob characters.
+func hasMeta(s string) bool {
+	return strings.IndexAny(s, "*?[") >= 0
+}
+
+type filter struct {
+	m map[string]struct{}
+}
+
+func (f *filter) Match(s string) bool {
+	_, ok := f.m[s]
+	return ok
+}
+
+type filtersingle struct {
+	s string
+}
+
+func (f *filtersingle) Match(s string) bool {
+	return f.s == s
+}
+
+func compileFilterNoGlob(filters []string) Filter {
+	if len(filters) == 1 {
+		return &filtersingle{s: filters[0]}
+	}
+	out := filter{m: make(map[string]struct{})}
+	for _, filter := range filters {
+		out.m[filter] = struct{}{}
+	}
+	return &out
+}

filter/filter_test.go

@@ -0,0 +1,96 @@
+package filter
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCompile(t *testing.T) {
+	f, err := Compile([]string{})
+	assert.NoError(t, err)
+	assert.Nil(t, f)
+
+	f, err = Compile([]string{"cpu"})
+	assert.NoError(t, err)
+	assert.True(t, f.Match("cpu"))
+	assert.False(t, f.Match("cpu0"))
+	assert.False(t, f.Match("mem"))
+
+	f, err = Compile([]string{"cpu*"})
+	assert.NoError(t, err)
+	assert.True(t, f.Match("cpu"))
+	assert.True(t, f.Match("cpu0"))
+	assert.False(t, f.Match("mem"))
+
+	f, err = Compile([]string{"cpu", "mem"})
+	assert.NoError(t, err)
+	assert.True(t, f.Match("cpu"))
+	assert.False(t, f.Match("cpu0"))
+	assert.True(t, f.Match("mem"))
+
+	f, err = Compile([]string{"cpu", "mem", "net*"})
+	assert.NoError(t, err)
+	assert.True(t, f.Match("cpu"))
+	assert.False(t, f.Match("cpu0"))
+	assert.True(t, f.Match("mem"))
+	assert.True(t, f.Match("network"))
+}
+
+var benchbool bool
+
+func BenchmarkFilterSingleNoGlobFalse(b *testing.B) {
+	f, _ := Compile([]string{"cpu"})
+	var tmp bool
+	for n := 0; n < b.N; n++ {
+		tmp = f.Match("network")
+	}
+	benchbool = tmp
+}
+
+func BenchmarkFilterSingleNoGlobTrue(b *testing.B) {
+	f, _ := Compile([]string{"cpu"})
+	var tmp bool
+	for n := 0; n < b.N; n++ {
+		tmp = f.Match("cpu")
+	}
+	benchbool = tmp
+}
+
+func BenchmarkFilter(b *testing.B) {
+	f, _ := Compile([]string{"cpu", "mem", "net*"})
+	var tmp bool
+	for n := 0; n < b.N; n++ {
+		tmp = f.Match("network")
+	}
+	benchbool = tmp
+}
+
+func BenchmarkFilterNoGlob(b *testing.B) {
+	f, _ := Compile([]string{"cpu", "mem", "net"})
+	var tmp bool
+	for n := 0; n < b.N; n++ {
+		tmp = f.Match("net")
+	}
+	benchbool = tmp
+}
+
+func BenchmarkFilter2(b *testing.B) {
+	f, _ := Compile([]string{"aa", "bb", "c", "ad", "ar", "at", "aq",
+		"aw", "az", "axxx", "ab", "cpu", "mem", "net*"})
+	var tmp bool
+	for n := 0; n < b.N; n++ {
+		tmp = f.Match("network")
+	}
+	benchbool = tmp
+}
+
+func BenchmarkFilter2NoGlob(b *testing.B) {
+	f, _ := Compile([]string{"aa", "bb", "c", "ad", "ar", "at", "aq",
+		"aw", "az", "axxx", "ab", "cpu", "mem", "net"})
+	var tmp bool
+	for n := 0; n < b.N; n++ {
+		tmp = f.Match("net")
+	}
+	benchbool = tmp
+}

input.go

@@ -0,0 +1,31 @@
+package telegraf
+
+type Input interface {
+	// SampleConfig returns the default configuration of the Input
+	SampleConfig() string
+
+	// Description returns a one-sentence description on the Input
+	Description() string
+
+	// Gather takes in an accumulator and adds the metrics that the Input
+	// gathers. This is called every "interval"
+	Gather(Accumulator) error
+}
+
+type ServiceInput interface {
+	// SampleConfig returns the default configuration of the Input
+	SampleConfig() string
+
+	// Description returns a one-sentence description on the Input
+	Description() string
+
+	// Gather takes in an accumulator and adds the metrics that the Input
+	// gathers. This is called every "interval"
+	Gather(Accumulator) error
+
+	// Start starts the ServiceInput's service, whatever that may be
+	Start(Accumulator) error
+
+	// Stop stops the services and closes any necessary channels and connections
+	Stop()
+}

internal/buffer/buffer.go

@@ -0,0 +1,74 @@
+package buffer
+
+import (
+	"sync"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/selfstat"
+)
+
+var (
+	MetricsWritten = selfstat.Register("agent", "metrics_written", map[string]string{})
+	MetricsDropped = selfstat.Register("agent", "metrics_dropped", map[string]string{})
+)
+
+// Buffer is an object for storing metrics in a circular buffer.
+type Buffer struct {
+	buf chan telegraf.Metric
+
+	mu sync.Mutex
+}
+
+// NewBuffer returns a Buffer
+//   size is the maximum number of metrics that Buffer will cache. If Add is
+//   called when the buffer is full, then the oldest metric(s) will be dropped.
+func NewBuffer(size int) *Buffer {
+	return &Buffer{
+		buf: make(chan telegraf.Metric, size),
+	}
+}
+
+// IsEmpty returns true if Buffer is empty.
+func (b *Buffer) IsEmpty() bool {
+	return len(b.buf) == 0
+}
+
+// Len returns the current length of the buffer.
+func (b *Buffer) Len() int {
+	return len(b.buf)
+}
+
+// Add adds metrics to the buffer.
+func (b *Buffer) Add(metrics ...telegraf.Metric) {
+	for i, _ := range metrics {
+		MetricsWritten.Incr(1)
+		select {
+		case b.buf <- metrics[i]:
+		default:
+			MetricsDropped.Incr(1)
+			<-b.buf
+			b.buf <- metrics[i]
+		}
+	}
+}
+
+// Batch returns a batch of metrics of size batchSize.
+// the batch will be of maximum length batchSize. It can be less than batchSize,
+// if the length of Buffer is less than batchSize.
+func (b *Buffer) Batch(batchSize int) []telegraf.Metric {
+	b.mu.Lock()
+	n := min(len(b.buf), batchSize)
+	out := make([]telegraf.Metric, n)
+	for i := 0; i < n; i++ {
+		out[i] = <-b.buf
+	}
+	b.mu.Unlock()
+	return out
+}
+
+func min(a, b int) int {
+	if b < a {
+		return b
+	}
+	return a
+}

internal/buffer/buffer_test.go

@@ -0,0 +1,100 @@
+package buffer
+
+import (
+	"testing"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/testutil"
+
+	"github.com/stretchr/testify/assert"
+)
+
+var metricList = []telegraf.Metric{
+	testutil.TestMetric(2, "mymetric1"),
+	testutil.TestMetric(1, "mymetric2"),
+	testutil.TestMetric(11, "mymetric3"),
+	testutil.TestMetric(15, "mymetric4"),
+	testutil.TestMetric(8, "mymetric5"),
+}
+
+func BenchmarkAddMetrics(b *testing.B) {
+	buf := NewBuffer(10000)
+	m := testutil.TestMetric(1, "mymetric")
+	for n := 0; n < b.N; n++ {
+		buf.Add(m)
+	}
+}
+
+func TestNewBufferBasicFuncs(t *testing.T) {
+	b := NewBuffer(10)
+	MetricsDropped.Set(0)
+	MetricsWritten.Set(0)
+
+	assert.True(t, b.IsEmpty())
+	assert.Zero(t, b.Len())
+	assert.Zero(t, MetricsDropped.Get())
+	assert.Zero(t, MetricsWritten.Get())
+
+	m := testutil.TestMetric(1, "mymetric")
+	b.Add(m)
+	assert.False(t, b.IsEmpty())
+	assert.Equal(t, b.Len(), 1)
+	assert.Equal(t, int64(0), MetricsDropped.Get())
+	assert.Equal(t, int64(1), MetricsWritten.Get())
+
+	b.Add(metricList...)
+	assert.False(t, b.IsEmpty())
+	assert.Equal(t, b.Len(), 6)
+	assert.Equal(t, int64(0), MetricsDropped.Get())
+	assert.Equal(t, int64(6), MetricsWritten.Get())
+}
+
+func TestDroppingMetrics(t *testing.T) {
+	b := NewBuffer(10)
+	MetricsDropped.Set(0)
+	MetricsWritten.Set(0)
+
+	// Add up to the size of the buffer
+	b.Add(metricList...)
+	b.Add(metricList...)
+	assert.False(t, b.IsEmpty())
+	assert.Equal(t, b.Len(), 10)
+	assert.Equal(t, int64(0), MetricsDropped.Get())
+	assert.Equal(t, int64(10), MetricsWritten.Get())
+
+	// Add 5 more and verify they were dropped
+	b.Add(metricList...)
+	assert.False(t, b.IsEmpty())
+	assert.Equal(t, b.Len(), 10)
+	assert.Equal(t, int64(5), MetricsDropped.Get())
+	assert.Equal(t, int64(15), MetricsWritten.Get())
+}
+
+func TestGettingBatches(t *testing.T) {
+	b := NewBuffer(20)
+	MetricsDropped.Set(0)
+	MetricsWritten.Set(0)
+
+	// Verify that the buffer returned is smaller than requested when there are
+	// not as many items as requested.
+	b.Add(metricList...)
+	batch := b.Batch(10)
+	assert.Len(t, batch, 5)
+
+	// Verify that the buffer is now empty
+	assert.True(t, b.IsEmpty())
+	assert.Zero(t, b.Len())
+	assert.Zero(t, MetricsDropped.Get())
+	assert.Equal(t, int64(5), MetricsWritten.Get())
+
+	// Verify that the buffer returned is not more than the size requested
+	b.Add(metricList...)
+	batch = b.Batch(3)
+	assert.Len(t, batch, 3)
+
+	// Verify that buffer is not empty
+	assert.False(t, b.IsEmpty())
+	assert.Equal(t, b.Len(), 2)
+	assert.Equal(t, int64(0), MetricsDropped.Get())
+	assert.Equal(t, int64(10), MetricsWritten.Get())
+}

internal/config/aws/credentials.go

@@ -0,0 +1,49 @@
+package aws
+
+import (
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/client"
+	"github.com/aws/aws-sdk-go/aws/credentials"
+	"github.com/aws/aws-sdk-go/aws/credentials/stscreds"
+	"github.com/aws/aws-sdk-go/aws/session"
+)
+
+type CredentialConfig struct {
+	Region    string
+	AccessKey string
+	SecretKey string
+	RoleARN   string
+	Profile   string
+	Filename  string
+	Token     string
+}
+
+func (c *CredentialConfig) Credentials() client.ConfigProvider {
+	if c.RoleARN != "" {
+		return c.assumeCredentials()
+	} else {
+		return c.rootCredentials()
+	}
+}
+
+func (c *CredentialConfig) rootCredentials() client.ConfigProvider {
+	config := &aws.Config{
+		Region: aws.String(c.Region),
+	}
+	if c.AccessKey != "" || c.SecretKey != "" {
+		config.Credentials = credentials.NewStaticCredentials(c.AccessKey, c.SecretKey, c.Token)
+	} else if c.Profile != "" || c.Filename != "" {
+		config.Credentials = credentials.NewSharedCredentials(c.Filename, c.Profile)
+	}
+
+	return session.New(config)
+}
+
+func (c *CredentialConfig) assumeCredentials() client.ConfigProvider {
+	rootCredentials := c.rootCredentials()
+	config := &aws.Config{
+		Region: aws.String(c.Region),
+	}
+	config.Credentials = stscreds.NewCredentials(rootCredentials, c.RoleARN)
+	return session.New(config)
+}

internal/config/config_test.go

@@ -0,0 +1,176 @@
+package config
+
+import (
+	"os"
+	"testing"
+	"time"
+
+	"github.com/influxdata/telegraf/internal/models"
+	"github.com/influxdata/telegraf/plugins/inputs"
+	"github.com/influxdata/telegraf/plugins/inputs/exec"
+	"github.com/influxdata/telegraf/plugins/inputs/memcached"
+	"github.com/influxdata/telegraf/plugins/inputs/procstat"
+	"github.com/influxdata/telegraf/plugins/parsers"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestConfig_LoadSingleInputWithEnvVars(t *testing.T) {
+	c := NewConfig()
+	err := os.Setenv("MY_TEST_SERVER", "192.168.1.1")
+	assert.NoError(t, err)
+	err = os.Setenv("TEST_INTERVAL", "10s")
+	assert.NoError(t, err)
+	c.LoadConfig("./testdata/single_plugin_env_vars.toml")
+
+	memcached := inputs.Inputs["memcached"]().(*memcached.Memcached)
+	memcached.Servers = []string{"192.168.1.1"}
+
+	filter := models.Filter{
+		NameDrop:  []string{"metricname2"},
+		NamePass:  []string{"metricname1"},
+		FieldDrop: []string{"other", "stuff"},
+		FieldPass: []string{"some", "strings"},
+		TagDrop: []models.TagFilter{
+			models.TagFilter{
+				Name:   "badtag",
+				Filter: []string{"othertag"},
+			},
+		},
+		TagPass: []models.TagFilter{
+			models.TagFilter{
+				Name:   "goodtag",
+				Filter: []string{"mytag"},
+			},
+		},
+	}
+	assert.NoError(t, filter.Compile())
+	mConfig := &models.InputConfig{
+		Name:     "memcached",
+		Filter:   filter,
+		Interval: 10 * time.Second,
+	}
+	mConfig.Tags = make(map[string]string)
+
+	assert.Equal(t, memcached, c.Inputs[0].Input,
+		"Testdata did not produce a correct memcached struct.")
+	assert.Equal(t, mConfig, c.Inputs[0].Config,
+		"Testdata did not produce correct memcached metadata.")
+}
+
+func TestConfig_LoadSingleInput(t *testing.T) {
+	c := NewConfig()
+	c.LoadConfig("./testdata/single_plugin.toml")
+
+	memcached := inputs.Inputs["memcached"]().(*memcached.Memcached)
+	memcached.Servers = []string{"localhost"}
+
+	filter := models.Filter{
+		NameDrop:  []string{"metricname2"},
+		NamePass:  []string{"metricname1"},
+		FieldDrop: []string{"other", "stuff"},
+		FieldPass: []string{"some", "strings"},
+		TagDrop: []models.TagFilter{
+			models.TagFilter{
+				Name:   "badtag",
+				Filter: []string{"othertag"},
+			},
+		},
+		TagPass: []models.TagFilter{
+			models.TagFilter{
+				Name:   "goodtag",
+				Filter: []string{"mytag"},
+			},
+		},
+	}
+	assert.NoError(t, filter.Compile())
+	mConfig := &models.InputConfig{
+		Name:     "memcached",
+		Filter:   filter,
+		Interval: 5 * time.Second,
+	}
+	mConfig.Tags = make(map[string]string)
+
+	assert.Equal(t, memcached, c.Inputs[0].Input,
+		"Testdata did not produce a correct memcached struct.")
+	assert.Equal(t, mConfig, c.Inputs[0].Config,
+		"Testdata did not produce correct memcached metadata.")
+}
+
+func TestConfig_LoadDirectory(t *testing.T) {
+	c := NewConfig()
+	err := c.LoadConfig("./testdata/single_plugin.toml")
+	if err != nil {
+		t.Error(err)
+	}
+	err = c.LoadDirectory("./testdata/subconfig")
+	if err != nil {
+		t.Error(err)
+	}
+
+	memcached := inputs.Inputs["memcached"]().(*memcached.Memcached)
+	memcached.Servers = []string{"localhost"}
+
+	filter := models.Filter{
+		NameDrop:  []string{"metricname2"},
+		NamePass:  []string{"metricname1"},
+		FieldDrop: []string{"other", "stuff"},
+		FieldPass: []string{"some", "strings"},
+		TagDrop: []models.TagFilter{
+			models.TagFilter{
+				Name:   "badtag",
+				Filter: []string{"othertag"},
+			},
+		},
+		TagPass: []models.TagFilter{
+			models.TagFilter{
+				Name:   "goodtag",
+				Filter: []string{"mytag"},
+			},
+		},
+	}
+	assert.NoError(t, filter.Compile())
+	mConfig := &models.InputConfig{
+		Name:     "memcached",
+		Filter:   filter,
+		Interval: 5 * time.Second,
+	}
+	mConfig.Tags = make(map[string]string)
+
+	assert.Equal(t, memcached, c.Inputs[0].Input,
+		"Testdata did not produce a correct memcached struct.")
+	assert.Equal(t, mConfig, c.Inputs[0].Config,
+		"Testdata did not produce correct memcached metadata.")
+
+	ex := inputs.Inputs["exec"]().(*exec.Exec)
+	p, err := parsers.NewJSONParser("exec", nil, nil)
+	assert.NoError(t, err)
+	ex.SetParser(p)
+	ex.Command = "/usr/bin/myothercollector --foo=bar"
+	eConfig := &models.InputConfig{
+		Name:              "exec",
+		MeasurementSuffix: "_myothercollector",
+	}
+	eConfig.Tags = make(map[string]string)
+	assert.Equal(t, ex, c.Inputs[1].Input,
+		"Merged Testdata did not produce a correct exec struct.")
+	assert.Equal(t, eConfig, c.Inputs[1].Config,
+		"Merged Testdata did not produce correct exec metadata.")
+
+	memcached.Servers = []string{"192.168.1.1"}
+	assert.Equal(t, memcached, c.Inputs[2].Input,
+		"Testdata did not produce a correct memcached struct.")
+	assert.Equal(t, mConfig, c.Inputs[2].Config,
+		"Testdata did not produce correct memcached metadata.")
+
+	pstat := inputs.Inputs["procstat"]().(*procstat.Procstat)
+	pstat.PidFile = "/var/run/grafana-server.pid"
+
+	pConfig := &models.InputConfig{Name: "procstat"}
+	pConfig.Tags = make(map[string]string)
+
+	assert.Equal(t, pstat, c.Inputs[3].Input,
+		"Merged Testdata did not produce a correct procstat struct.")
+	assert.Equal(t, pConfig, c.Inputs[3].Config,
+		"Merged Testdata did not produce correct procstat metadata.")
+}

internal/config/testdata/single_plugin.toml

@@ -0,0 +1,11 @@
+[[inputs.memcached]]
+  servers = ["localhost"]
+  namepass = ["metricname1"]
+  namedrop = ["metricname2"]
+  fieldpass = ["some", "strings"]
+  fielddrop = ["other", "stuff"]
+  interval = "5s"
+  [inputs.memcached.tagpass]
+    goodtag = ["mytag"]
+  [inputs.memcached.tagdrop]
+    badtag = ["othertag"]

internal/config/testdata/single_plugin_env_vars.toml

@@ -0,0 +1,11 @@
+[[inputs.memcached]]
+  servers = ["$MY_TEST_SERVER"]
+  namepass = ["metricname1"]
+  namedrop = ["metricname2"]
+  fieldpass = ["some", "strings"]
+  fielddrop = ["other", "stuff"]
+  interval = "$TEST_INTERVAL"
+  [inputs.memcached.tagpass]
+    goodtag = ["mytag"]
+  [inputs.memcached.tagdrop]
+    badtag = ["othertag"]

internal/config/testdata/subconfig/exec.conf

@@ -0,0 +1,4 @@
+[[inputs.exec]]
+  # the command to run
+  command = "/usr/bin/myothercollector --foo=bar"
+  name_suffix = "_myothercollector"

internal/config/testdata/subconfig/memcached.conf

@@ -0,0 +1,11 @@
+[[inputs.memcached]]
+  servers = ["192.168.1.1"]
+  namepass = ["metricname1"]
+  namedrop = ["metricname2"]
+  pass = ["some", "strings"]
+  drop = ["other", "stuff"]
+  interval = "5s"
+  [inputs.memcached.tagpass]
+    goodtag = ["mytag"]
+  [inputs.memcached.tagdrop]
+    badtag = ["othertag"]

internal/config/testdata/subconfig/procstat.conf

@@ -0,0 +1,2 @@
+[[inputs.procstat]]
+  pid_file = "/var/run/grafana-server.pid"

internal/config/testdata/telegraf-agent.toml

@@ -0,0 +1,310 @@
+# Telegraf configuration
+
+# Telegraf is entirely plugin driven. All metrics are gathered from the
+# declared inputs.
+
+# Even if a plugin has no configuration, it must be declared in here
+# to be active. Declaring a plugin means just specifying the name
+# as a section with no variables. To deactivate a plugin, comment
+# out the name and any variables.
+
+# Use 'telegraf -config telegraf.toml -test' to see what metrics a config
+# file would generate.
+
+# One rule that plugins conform to is wherever a connection string
+# can be passed, the values '' and 'localhost' are treated specially.
+# They indicate to the plugin to use their own builtin configuration to
+# connect to the local system.
+
+# NOTE: The configuration has a few required parameters. They are marked
+# with 'required'. Be sure to edit those to make this configuration work.
+
+# Tags can also be specified via a normal map, but only one form at a time:
+[global_tags]
+  dc = "us-east-1"
+
+# Configuration for telegraf agent
+[agent]
+  # Default data collection interval for all plugins
+  interval = "10s"
+
+  # run telegraf in debug mode
+  debug = false
+
+  # Override default hostname, if empty use os.Hostname()
+  hostname = ""
+
+
+###############################################################################
+#                                  OUTPUTS                                    #
+###############################################################################
+
+# Configuration for influxdb server to send metrics to
+[[outputs.influxdb]]
+  # The full HTTP endpoint URL for your InfluxDB instance
+  # Multiple urls can be specified for InfluxDB cluster support. Server to
+  # write to will be randomly chosen each interval.
+  urls = ["http://localhost:8086"] # required.
+
+  # The target database for metrics. This database must already exist
+  database = "telegraf" # required.
+
+[[outputs.influxdb]]
+  urls = ["udp://localhost:8089"]
+  database = "udp-telegraf"
+
+# Configuration for the Kafka server to send metrics to
+[[outputs.kafka]]
+  # URLs of kafka brokers
+  brokers = ["localhost:9092"]
+  # Kafka topic for producer messages
+  topic = "telegraf"
+  # Telegraf tag to use as a routing key
+  #  ie, if this tag exists, it's value will be used as the routing key
+  routing_tag = "host"
+
+
+###############################################################################
+#                                  PLUGINS                                    #
+###############################################################################
+
+# Read Apache status information (mod_status)
+[[inputs.apache]]
+  # An array of Apache status URI to gather stats.
+  urls = ["http://localhost/server-status?auto"]
+
+# Read metrics about cpu usage
+[[inputs.cpu]]
+  # Whether to report per-cpu stats or not
+  percpu = true
+  # Whether to report total system cpu stats or not
+  totalcpu = true
+  # Comment this line if you want the raw CPU time metrics
+  drop = ["cpu_time"]
+
+# Read metrics about disk usage by mount point
+[[inputs.diskio]]
+  # no configuration
+
+# Read metrics from one or many disque servers
+[[inputs.disque]]
+  # An array of URI to gather stats about. Specify an ip or hostname
+  # with optional port and password. ie disque://localhost, disque://10.10.3.33:18832,
+  # 10.0.0.1:10000, etc.
+  #
+  # If no servers are specified, then localhost is used as the host.
+  servers = ["localhost"]
+
+# Read stats from one or more Elasticsearch servers or clusters
+[[inputs.elasticsearch]]
+  # specify a list of one or more Elasticsearch servers
+  servers = ["http://localhost:9200"]
+
+  # set local to false when you want to read the indices stats from all nodes
+  # within the cluster
+  local = true
+
+# Read flattened metrics from one or more commands that output JSON to stdout
+[[inputs.exec]]
+  # the command to run
+  command = "/usr/bin/mycollector --foo=bar"
+  name_suffix = "_mycollector"
+
+# Read metrics of haproxy, via socket or csv stats page
+[[inputs.haproxy]]
+  # An array of address to gather stats about. Specify an ip on hostname
+  # with optional port. ie localhost, 10.10.3.33:1936, etc.
+  #
+  # If no servers are specified, then default to 127.0.0.1:1936
+  servers = ["http://myhaproxy.com:1936", "http://anotherhaproxy.com:1936"]
+  # Or you can also use local socket(not work yet)
+  # servers = ["socket:/run/haproxy/admin.sock"]
+
+# Read flattened metrics from one or more JSON HTTP endpoints
+[[inputs.httpjson]]
+  # a name for the service being polled
+  name = "webserver_stats"
+
+  # URL of each server in the service's cluster
+  servers = [
+    "http://localhost:9999/stats/",
+    "http://localhost:9998/stats/",
+  ]
+
+  # HTTP method to use (case-sensitive)
+  method = "GET"
+
+  # HTTP parameters (all values must be strings)
+  [httpjson.parameters]
+    event_type = "cpu_spike"
+    threshold = "0.75"
+
+# Read metrics about disk IO by device
+[[inputs.diskio]]
+  # no configuration
+
+# read metrics from a Kafka topic
+[[inputs.kafka_consumer]]
+  # topic(s) to consume
+  topics = ["telegraf"]
+  # an array of Zookeeper connection strings
+  zookeeper_peers = ["localhost:2181"]
+  # the name of the consumer group
+  consumer_group = "telegraf_metrics_consumers"
+  # Maximum number of points to buffer between collection intervals
+  point_buffer = 100000
+  # Offset (must be either "oldest" or "newest")
+  offset = "oldest"
+
+# Read metrics from a LeoFS Server via SNMP
+[[inputs.leofs]]
+  # An array of URI to gather stats about LeoFS.
+  # Specify an ip or hostname with port. ie 127.0.0.1:4020
+  #
+  # If no servers are specified, then 127.0.0.1 is used as the host and 4020 as the port.
+  servers = ["127.0.0.1:4021"]
+
+# Read metrics from local Lustre service on OST, MDS
+[[inputs.lustre2]]
+  # An array of /proc globs to search for Lustre stats
+  # If not specified, the default will work on Lustre 2.5.x
+  #
+  # ost_procfiles = ["/proc/fs/lustre/obdfilter/*/stats", "/proc/fs/lustre/osd-ldiskfs/*/stats"]
+  # mds_procfiles = ["/proc/fs/lustre/mdt/*/md_stats"]
+
+# Read metrics about memory usage
+[[inputs.mem]]
+  # no configuration
+
+# Read metrics from one or many memcached servers
+[[inputs.memcached]]
+  # An array of address to gather stats about. Specify an ip on hostname
+  # with optional port. ie localhost, 10.0.0.1:11211, etc.
+  #
+  # If no servers are specified, then localhost is used as the host.
+  servers = ["localhost"]
+
+# Telegraf plugin for gathering metrics from N Mesos masters
+[[inputs.mesos]]
+  # Timeout, in ms.
+  timeout = 100
+  # A list of Mesos masters, default value is localhost:5050.
+  masters = ["localhost:5050"]
+  # Metrics groups to be collected, by default, all enabled.
+  master_collections = ["resources","master","system","slaves","frameworks","messages","evqueue","registrar"]
+
+# Read metrics from one or many MongoDB servers
+[[inputs.mongodb]]
+  # An array of URI to gather stats about. Specify an ip or hostname
+  # with optional port add password. ie mongodb://user:auth_key@10.10.3.30:27017,
+  # mongodb://10.10.3.33:18832, 10.0.0.1:10000, etc.
+  #
+  # If no servers are specified, then 127.0.0.1 is used as the host and 27107 as the port.
+  servers = ["127.0.0.1:27017"]
+
+# Read metrics from one or many mysql servers
+[[inputs.mysql]]
+  # specify servers via a url matching:
+  #  [username[:password]@][protocol[(address)]]/[?tls=[true|false|skip-verify]]
+  #  e.g.
+  #    servers = ["root:root@http://10.0.0.18/?tls=false"]
+  #    servers = ["root:passwd@tcp(127.0.0.1:3306)/"]
+  #
+  # If no servers are specified, then localhost is used as the host.
+  servers = ["localhost"]
+
+# Read metrics about network interface usage
+[[inputs.net]]
+  # By default, telegraf gathers stats from any up interface (excluding loopback)
+  # Setting interfaces will tell it to gather these explicit interfaces,
+  # regardless of status.
+  #
+  # interfaces = ["eth0", ... ]
+
+# Read Nginx's basic status information (ngx_http_stub_status_module)
+[[inputs.nginx]]
+  # An array of Nginx stub_status URI to gather stats.
+  urls = ["http://localhost/status"]
+
+# Ping given url(s) and return statistics
+[[inputs.ping]]
+  # urls to ping
+  urls = ["www.google.com"] # required
+  # number of pings to send (ping -c <COUNT>)
+  count = 1 # required
+  # interval, in s, at which to ping. 0 == default (ping -i <PING_INTERVAL>)
+  ping_interval = 0.0
+  # ping timeout, in s. 0 == no timeout (ping -t <TIMEOUT>)
+  timeout = 0.0
+  # interface to send ping from (ping -I <INTERFACE>)
+  interface = ""
+
+# Read metrics from one or many postgresql servers
+[[inputs.postgresql]]
+  # specify address via a url matching:
+  #   postgres://[pqgotest[:password]]@localhost[/dbname]?sslmode=[disable|verify-ca|verify-full]
+  # or a simple string:
+  #   host=localhost user=pqotest password=... sslmode=... dbname=app_production
+  #
+  # All connection parameters are optional. By default, the host is localhost
+  # and the user is the currently running user. For localhost, we default
+  # to sslmode=disable as well.
+  #
+  # Without the dbname parameter, the driver will default to a database
+  # with the same name as the user. This dbname is just for instantiating a
+  # connection with the server and doesn't restrict the databases we are trying
+  # to grab metrics for.
+  #
+
+  address = "sslmode=disable"
+
+  # A list of databases to pull metrics about. If not specified, metrics for all
+  # databases are gathered.
+
+  # databases = ["app_production", "blah_testing"]
+
+  # [[postgresql.servers]]
+  # address = "influx@remoteserver"
+
+# Read metrics from one or many prometheus clients
+[[inputs.prometheus]]
+  # An array of urls to scrape metrics from.
+  urls = ["http://localhost:9100/metrics"]
+
+# Read metrics from one or many RabbitMQ servers via the management API
+[[inputs.rabbitmq]]
+  # Specify servers via an array of tables
+  # name = "rmq-server-1" # optional tag
+  # url = "http://localhost:15672"
+  # username = "guest"
+  # password = "guest"
+
+  # A list of nodes to pull metrics about. If not specified, metrics for
+  # all nodes are gathered.
+  # nodes = ["rabbit@node1", "rabbit@node2"]
+
+# Read metrics from one or many redis servers
+[[inputs.redis]]
+  # An array of URI to gather stats about. Specify an ip or hostname
+  # with optional port add password. ie redis://localhost, redis://10.10.3.33:18832,
+  # 10.0.0.1:10000, etc.
+  #
+  # If no servers are specified, then localhost is used as the host.
+  servers = ["localhost"]
+
+# Read metrics from one or many RethinkDB servers
+[[inputs.rethinkdb]]
+  # An array of URI to gather stats about. Specify an ip or hostname
+  # with optional port add password. ie rethinkdb://user:auth_key@10.10.3.30:28105,
+  # rethinkdb://10.10.3.33:18832, 10.0.0.1:10000, etc.
+  #
+  # If no servers are specified, then 127.0.0.1 is used as the host and 28015 as the port.
+  servers = ["127.0.0.1:28015"]
+
+# Read metrics about swap memory usage
+[[inputs.swap]]
+  # no configuration
+
+# Read metrics about system load & uptime
+[[inputs.system]]
+  # no configuration

internal/errchan/errchan.go

@@ -0,0 +1,37 @@
+package errchan
+
+import (
+	"fmt"
+	"strings"
+)
+
+type ErrChan struct {
+	C chan error
+}
+
+// New returns an error channel of max length 'n'
+// errors can be sent to the ErrChan.C channel, and will be returned when
+// ErrChan.Error() is called.
+func New(n int) *ErrChan {
+	return &ErrChan{
+		C: make(chan error, n),
+	}
+}
+
+// Error closes the ErrChan.C channel and returns an error if there are any
+// non-nil errors, otherwise returns nil.
+func (e *ErrChan) Error() error {
+	close(e.C)
+
+	var out string
+	for err := range e.C {
+		if err != nil {
+			out += "[" + err.Error() + "], "
+		}
+	}
+
+	if out != "" {
+		return fmt.Errorf("Errors encountered: " + strings.TrimRight(out, ", "))
+	}
+	return nil
+}

internal/globpath/globpath.go

@@ -0,0 +1,116 @@
+package globpath
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/gobwas/glob"
+)
+
+var sepStr = fmt.Sprintf("%v", string(os.PathSeparator))
+
+type GlobPath struct {
+	path         string
+	hasMeta      bool
+	hasSuperMeta bool
+	g            glob.Glob
+	root         string
+}
+
+func Compile(path string) (*GlobPath, error) {
+	out := GlobPath{
+		hasMeta:      hasMeta(path),
+		hasSuperMeta: hasSuperMeta(path),
+		path:         path,
+	}
+
+	// if there are no glob meta characters in the path, don't bother compiling
+	// a glob object or finding the root directory. (see short-circuit in Match)
+	if !out.hasMeta || !out.hasSuperMeta {
+		return &out, nil
+	}
+
+	var err error
+	if out.g, err = glob.Compile(path, os.PathSeparator); err != nil {
+		return nil, err
+	}
+	// Get the root directory for this filepath
+	out.root = findRootDir(path)
+	return &out, nil
+}
+
+func (g *GlobPath) Match() map[string]os.FileInfo {
+	if !g.hasMeta {
+		out := make(map[string]os.FileInfo)
+		info, err := os.Stat(g.path)
+		if !os.IsNotExist(err) {
+			out[g.path] = info
+		}
+		return out
+	}
+	if !g.hasSuperMeta {
+		out := make(map[string]os.FileInfo)
+		files, _ := filepath.Glob(g.path)
+		for _, file := range files {
+			info, err := os.Stat(file)
+			if !os.IsNotExist(err) {
+				out[file] = info
+			}
+		}
+		return out
+	}
+	return walkFilePath(g.root, g.g)
+}
+
+// walk the filepath from the given root and return a list of files that match
+// the given glob.
+func walkFilePath(root string, g glob.Glob) map[string]os.FileInfo {
+	matchedFiles := make(map[string]os.FileInfo)
+	walkfn := func(path string, info os.FileInfo, _ error) error {
+		if g.Match(path) {
+			matchedFiles[path] = info
+		}
+		return nil
+	}
+	filepath.Walk(root, walkfn)
+	return matchedFiles
+}
+
+// find the root dir of the given path (could include globs).
+// ie:
+//   /var/log/telegraf.conf -> /var/log
+//   /home/** ->               /home
+//   /home/*/** ->             /home
+//   /lib/share/*/*/**.txt ->  /lib/share
+func findRootDir(path string) string {
+	pathItems := strings.Split(path, sepStr)
+	out := sepStr
+	for i, item := range pathItems {
+		if i == len(pathItems)-1 {
+			break
+		}
+		if item == "" {
+			continue
+		}
+		if hasMeta(item) {
+			break
+		}
+		out += item + sepStr
+	}
+	if out != "/" {
+		out = strings.TrimSuffix(out, "/")
+	}
+	return out
+}
+
+// hasMeta reports whether path contains any magic glob characters.
+func hasMeta(path string) bool {
+	return strings.IndexAny(path, "*?[") >= 0
+}
+
+// hasSuperMeta reports whether path contains any super magic glob characters (**).
+func hasSuperMeta(path string) bool {
+	return strings.Index(path, "**") >= 0
+}

internal/globpath/globpath_test.go

@@ -0,0 +1,62 @@
+package globpath
+
+import (
+	"runtime"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestCompileAndMatch(t *testing.T) {
+	dir := getTestdataDir()
+	// test super asterisk
+	g1, err := Compile(dir + "/**")
+	require.NoError(t, err)
+	// test single asterisk
+	g2, err := Compile(dir + "/*.log")
+	require.NoError(t, err)
+	// test no meta characters (file exists)
+	g3, err := Compile(dir + "/log1.log")
+	require.NoError(t, err)
+	// test file that doesn't exist
+	g4, err := Compile(dir + "/i_dont_exist.log")
+	require.NoError(t, err)
+	// test super asterisk that doesn't exist
+	g5, err := Compile(dir + "/dir_doesnt_exist/**")
+	require.NoError(t, err)
+
+	matches := g1.Match()
+	assert.Len(t, matches, 3)
+	matches = g2.Match()
+	assert.Len(t, matches, 2)
+	matches = g3.Match()
+	assert.Len(t, matches, 1)
+	matches = g4.Match()
+	assert.Len(t, matches, 0)
+	matches = g5.Match()
+	assert.Len(t, matches, 0)
+}
+
+func TestFindRootDir(t *testing.T) {
+	tests := []struct {
+		input  string
+		output string
+	}{
+		{"/var/log/telegraf.conf", "/var/log"},
+		{"/home/**", "/home"},
+		{"/home/*/**", "/home"},
+		{"/lib/share/*/*/**.txt", "/lib/share"},
+	}
+
+	for _, test := range tests {
+		actual := findRootDir(test.input)
+		assert.Equal(t, test.output, actual)
+	}
+}
+
+func getTestdataDir() string {
+	_, filename, _, _ := runtime.Caller(1)
+	return strings.Replace(filename, "globpath_test.go", "testdata", 1)
+}

internal/globpath/testdata/test.conf

@@ -0,0 +1,5 @@
+# this is a fake testing config file
+# for testing the filestat plugin
+
+option1 = "foo"
+option2 = "bar"

internal/internal.go

@@ -0,0 +1,242 @@
+package internal
+
+import (
+	"bufio"
+	"bytes"
+	"crypto/rand"
+	"crypto/tls"
+	"crypto/x509"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"math/big"
+	"os"
+	"os/exec"
+	"strconv"
+	"strings"
+	"time"
+	"unicode"
+)
+
+const alphanum string = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+
+var (
+	TimeoutErr = errors.New("Command timed out.")
+
+	NotImplementedError = errors.New("not implemented yet")
+)
+
+// Duration just wraps time.Duration
+type Duration struct {
+	Duration time.Duration
+}
+
+// UnmarshalTOML parses the duration from the TOML config file
+func (d *Duration) UnmarshalTOML(b []byte) error {
+	var err error
+	b = bytes.Trim(b, `'`)
+
+	// see if we can directly convert it
+	d.Duration, err = time.ParseDuration(string(b))
+	if err == nil {
+		return nil
+	}
+
+	// Parse string duration, ie, "1s"
+	if uq, err := strconv.Unquote(string(b)); err == nil && len(uq) > 0 {
+		d.Duration, err = time.ParseDuration(uq)
+		if err == nil {
+			return nil
+		}
+	}
+
+	// First try parsing as integer seconds
+	sI, err := strconv.ParseInt(string(b), 10, 64)
+	if err == nil {
+		d.Duration = time.Second * time.Duration(sI)
+		return nil
+	}
+	// Second try parsing as float seconds
+	sF, err := strconv.ParseFloat(string(b), 64)
+	if err == nil {
+		d.Duration = time.Second * time.Duration(sF)
+		return nil
+	}
+
+	return nil
+}
+
+// ReadLines reads contents from a file and splits them by new lines.
+// A convenience wrapper to ReadLinesOffsetN(filename, 0, -1).
+func ReadLines(filename string) ([]string, error) {
+	return ReadLinesOffsetN(filename, 0, -1)
+}
+
+// ReadLines reads contents from file and splits them by new line.
+// The offset tells at which line number to start.
+// The count determines the number of lines to read (starting from offset):
+//   n >= 0: at most n lines
+//   n < 0: whole file
+func ReadLinesOffsetN(filename string, offset uint, n int) ([]string, error) {
+	f, err := os.Open(filename)
+	if err != nil {
+		return []string{""}, err
+	}
+	defer f.Close()
+
+	var ret []string
+
+	r := bufio.NewReader(f)
+	for i := 0; i < n+int(offset) || n < 0; i++ {
+		line, err := r.ReadString('\n')
+		if err != nil {
+			break
+		}
+		if i < int(offset) {
+			continue
+		}
+		ret = append(ret, strings.Trim(line, "\n"))
+	}
+
+	return ret, nil
+}
+
+// RandomString returns a random string of alpha-numeric characters
+func RandomString(n int) string {
+	var bytes = make([]byte, n)
+	rand.Read(bytes)
+	for i, b := range bytes {
+		bytes[i] = alphanum[b%byte(len(alphanum))]
+	}
+	return string(bytes)
+}
+
+// GetTLSConfig gets a tls.Config object from the given certs, key, and CA files.
+// you must give the full path to the files.
+// If all files are blank and InsecureSkipVerify=false, returns a nil pointer.
+func GetTLSConfig(
+	SSLCert, SSLKey, SSLCA string,
+	InsecureSkipVerify bool,
+) (*tls.Config, error) {
+	if SSLCert == "" && SSLKey == "" && SSLCA == "" && !InsecureSkipVerify {
+		return nil, nil
+	}
+
+	t := &tls.Config{
+		InsecureSkipVerify: InsecureSkipVerify,
+	}
+
+	if SSLCA != "" {
+		caCert, err := ioutil.ReadFile(SSLCA)
+		if err != nil {
+			return nil, errors.New(fmt.Sprintf("Could not load TLS CA: %s",
+				err))
+		}
+
+		caCertPool := x509.NewCertPool()
+		caCertPool.AppendCertsFromPEM(caCert)
+		t.RootCAs = caCertPool
+	}
+
+	if SSLCert != "" && SSLKey != "" {
+		cert, err := tls.LoadX509KeyPair(SSLCert, SSLKey)
+		if err != nil {
+			return nil, errors.New(fmt.Sprintf(
+				"Could not load TLS client key/certificate from %s:%s: %s",
+				SSLKey, SSLCert, err))
+		}
+
+		t.Certificates = []tls.Certificate{cert}
+		t.BuildNameToCertificate()
+	}
+
+	// will be nil by default if nothing is provided
+	return t, nil
+}
+
+// SnakeCase converts the given string to snake case following the Golang format:
+// acronyms are converted to lower-case and preceded by an underscore.
+func SnakeCase(in string) string {
+	runes := []rune(in)
+	length := len(runes)
+
+	var out []rune
+	for i := 0; i < length; i++ {
+		if i > 0 && unicode.IsUpper(runes[i]) && ((i+1 < length && unicode.IsLower(runes[i+1])) || unicode.IsLower(runes[i-1])) {
+			out = append(out, '_')
+		}
+		out = append(out, unicode.ToLower(runes[i]))
+	}
+
+	return string(out)
+}
+
+// CombinedOutputTimeout runs the given command with the given timeout and
+// returns the combined output of stdout and stderr.
+// If the command times out, it attempts to kill the process.
+func CombinedOutputTimeout(c *exec.Cmd, timeout time.Duration) ([]byte, error) {
+	var b bytes.Buffer
+	c.Stdout = &b
+	c.Stderr = &b
+	if err := c.Start(); err != nil {
+		return nil, err
+	}
+	err := WaitTimeout(c, timeout)
+	return b.Bytes(), err
+}
+
+// RunTimeout runs the given command with the given timeout.
+// If the command times out, it attempts to kill the process.
+func RunTimeout(c *exec.Cmd, timeout time.Duration) error {
+	if err := c.Start(); err != nil {
+		return err
+	}
+	return WaitTimeout(c, timeout)
+}
+
+// WaitTimeout waits for the given command to finish with a timeout.
+// It assumes the command has already been started.
+// If the command times out, it attempts to kill the process.
+func WaitTimeout(c *exec.Cmd, timeout time.Duration) error {
+	timer := time.NewTimer(timeout)
+	done := make(chan error)
+	go func() { done <- c.Wait() }()
+	select {
+	case err := <-done:
+		timer.Stop()
+		return err
+	case <-timer.C:
+		if err := c.Process.Kill(); err != nil {
+			log.Printf("E! FATAL error killing process: %s", err)
+			return err
+		}
+		// wait for the command to return after killing it
+		<-done
+		return TimeoutErr
+	}
+}
+
+// RandomSleep will sleep for a random amount of time up to max.
+// If the shutdown channel is closed, it will return before it has finished
+// sleeping.
+func RandomSleep(max time.Duration, shutdown chan struct{}) {
+	if max == 0 {
+		return
+	}
+	maxSleep := big.NewInt(max.Nanoseconds())
+
+	var sleepns int64
+	if j, err := rand.Int(rand.Reader, maxSleep); err == nil {
+		sleepns = j.Int64()
+	}
+
+	t := time.NewTimer(time.Nanosecond * time.Duration(sleepns))
+	select {
+	case <-t.C:
+		return
+	case <-shutdown:
+		t.Stop()
+		return
+	}
+}

internal/internal_test.go

@@ -0,0 +1,156 @@
+package internal
+
+import (
+	"os/exec"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+type SnakeTest struct {
+	input  string
+	output string
+}
+
+var tests = []SnakeTest{
+	{"a", "a"},
+	{"snake", "snake"},
+	{"A", "a"},
+	{"ID", "id"},
+	{"MOTD", "motd"},
+	{"Snake", "snake"},
+	{"SnakeTest", "snake_test"},
+	{"APIResponse", "api_response"},
+	{"SnakeID", "snake_id"},
+	{"SnakeIDGoogle", "snake_id_google"},
+	{"LinuxMOTD", "linux_motd"},
+	{"OMGWTFBBQ", "omgwtfbbq"},
+	{"omg_wtf_bbq", "omg_wtf_bbq"},
+}
+
+func TestSnakeCase(t *testing.T) {
+	for _, test := range tests {
+		if SnakeCase(test.input) != test.output {
+			t.Errorf(`SnakeCase("%s"), wanted "%s", got \%s"`, test.input, test.output, SnakeCase(test.input))
+		}
+	}
+}
+
+var (
+	sleepbin, _ = exec.LookPath("sleep")
+	echobin, _  = exec.LookPath("echo")
+)
+
+func TestRunTimeout(t *testing.T) {
+	if sleepbin == "" {
+		t.Skip("'sleep' binary not available on OS, skipping.")
+	}
+	cmd := exec.Command(sleepbin, "10")
+	start := time.Now()
+	err := RunTimeout(cmd, time.Millisecond*20)
+	elapsed := time.Since(start)
+
+	assert.Equal(t, TimeoutErr, err)
+	// Verify that command gets killed in 20ms, with some breathing room
+	assert.True(t, elapsed < time.Millisecond*75)
+}
+
+func TestCombinedOutputTimeout(t *testing.T) {
+	if sleepbin == "" {
+		t.Skip("'sleep' binary not available on OS, skipping.")
+	}
+	cmd := exec.Command(sleepbin, "10")
+	start := time.Now()
+	_, err := CombinedOutputTimeout(cmd, time.Millisecond*20)
+	elapsed := time.Since(start)
+
+	assert.Equal(t, TimeoutErr, err)
+	// Verify that command gets killed in 20ms, with some breathing room
+	assert.True(t, elapsed < time.Millisecond*75)
+}
+
+func TestCombinedOutput(t *testing.T) {
+	if echobin == "" {
+		t.Skip("'echo' binary not available on OS, skipping.")
+	}
+	cmd := exec.Command(echobin, "foo")
+	out, err := CombinedOutputTimeout(cmd, time.Second)
+
+	assert.NoError(t, err)
+	assert.Equal(t, "foo\n", string(out))
+}
+
+// test that CombinedOutputTimeout and exec.Cmd.CombinedOutput return
+// the same output from a failed command.
+func TestCombinedOutputError(t *testing.T) {
+	if sleepbin == "" {
+		t.Skip("'sleep' binary not available on OS, skipping.")
+	}
+	cmd := exec.Command(sleepbin, "foo")
+	expected, err := cmd.CombinedOutput()
+
+	cmd2 := exec.Command(sleepbin, "foo")
+	actual, err := CombinedOutputTimeout(cmd2, time.Second)
+
+	assert.Error(t, err)
+	assert.Equal(t, expected, actual)
+}
+
+func TestRunError(t *testing.T) {
+	if sleepbin == "" {
+		t.Skip("'sleep' binary not available on OS, skipping.")
+	}
+	cmd := exec.Command(sleepbin, "foo")
+	err := RunTimeout(cmd, time.Second)
+
+	assert.Error(t, err)
+}
+
+func TestRandomSleep(t *testing.T) {
+	// test that zero max returns immediately
+	s := time.Now()
+	RandomSleep(time.Duration(0), make(chan struct{}))
+	elapsed := time.Since(s)
+	assert.True(t, elapsed < time.Millisecond)
+
+	// test that max sleep is respected
+	s = time.Now()
+	RandomSleep(time.Millisecond*50, make(chan struct{}))
+	elapsed = time.Since(s)
+	assert.True(t, elapsed < time.Millisecond*100)
+
+	// test that shutdown is respected
+	s = time.Now()
+	shutdown := make(chan struct{})
+	go func() {
+		time.Sleep(time.Millisecond * 100)
+		close(shutdown)
+	}()
+	RandomSleep(time.Second, shutdown)
+	elapsed = time.Since(s)
+	assert.True(t, elapsed < time.Millisecond*150)
+}
+
+func TestDuration(t *testing.T) {
+	var d Duration
+
+	d.UnmarshalTOML([]byte(`"1s"`))
+	assert.Equal(t, time.Second, d.Duration)
+
+	d = Duration{}
+	d.UnmarshalTOML([]byte(`1s`))
+	assert.Equal(t, time.Second, d.Duration)
+
+	d = Duration{}
+	d.UnmarshalTOML([]byte(`'1s'`))
+	assert.Equal(t, time.Second, d.Duration)
+
+	d = Duration{}
+	d.UnmarshalTOML([]byte(`10`))
+	assert.Equal(t, 10*time.Second, d.Duration)
+
+	d = Duration{}
+	d.UnmarshalTOML([]byte(`1.5`))
+	assert.Equal(t, time.Second, d.Duration)
+}

internal/limiter/limiter.go

@@ -0,0 +1,59 @@
+package limiter
+
+import (
+	"sync"
+	"time"
+)
+
+// NewRateLimiter returns a rate limiter that will will emit from the C
+// channel only 'n' times every 'rate' seconds.
+func NewRateLimiter(n int, rate time.Duration) *rateLimiter {
+	r := &rateLimiter{
+		C:        make(chan bool),
+		rate:     rate,
+		n:        n,
+		shutdown: make(chan bool),
+	}
+	r.wg.Add(1)
+	go r.limiter()
+	return r
+}
+
+type rateLimiter struct {
+	C    chan bool
+	rate time.Duration
+	n    int
+
+	shutdown chan bool
+	wg       sync.WaitGroup
+}
+
+func (r *rateLimiter) Stop() {
+	close(r.shutdown)
+	r.wg.Wait()
+	close(r.C)
+}
+
+func (r *rateLimiter) limiter() {
+	defer r.wg.Done()
+	ticker := time.NewTicker(r.rate)
+	defer ticker.Stop()
+	counter := 0
+	for {
+		select {
+		case <-r.shutdown:
+			return
+		case <-ticker.C:
+			counter = 0
+		default:
+			if counter < r.n {
+				select {
+				case r.C <- true:
+					counter++
+				case <-r.shutdown:
+					return
+				}
+			}
+		}
+	}
+}

internal/limiter/limiter_test.go

@@ -0,0 +1,54 @@
+package limiter
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRateLimiter(t *testing.T) {
+	r := NewRateLimiter(5, time.Second)
+	ticker := time.NewTicker(time.Millisecond * 75)
+
+	// test that we can only get 5 receives from the rate limiter
+	counter := 0
+outer:
+	for {
+		select {
+		case <-r.C:
+			counter++
+		case <-ticker.C:
+			break outer
+		}
+	}
+
+	assert.Equal(t, 5, counter)
+	r.Stop()
+	// verify that the Stop function closes the channel.
+	_, ok := <-r.C
+	assert.False(t, ok)
+}
+
+func TestRateLimiterMultipleIterations(t *testing.T) {
+	r := NewRateLimiter(5, time.Millisecond*50)
+	ticker := time.NewTicker(time.Millisecond * 250)
+
+	// test that we can get 15 receives from the rate limiter
+	counter := 0
+outer:
+	for {
+		select {
+		case <-ticker.C:
+			break outer
+		case <-r.C:
+			counter++
+		}
+	}
+
+	assert.True(t, counter > 10)
+	r.Stop()
+	// verify that the Stop function closes the channel.
+	_, ok := <-r.C
+	assert.False(t, ok)
+}

internal/models/filter.go

@@ -0,0 +1,227 @@
+package models
+
+import (
+	"fmt"
+
+	"github.com/influxdata/telegraf/filter"
+)
+
+// TagFilter is the name of a tag, and the values on which to filter
+type TagFilter struct {
+	Name   string
+	Filter []string
+	filter filter.Filter
+}
+
+// Filter containing drop/pass and tagdrop/tagpass rules
+type Filter struct {
+	NameDrop []string
+	nameDrop filter.Filter
+	NamePass []string
+	namePass filter.Filter
+
+	FieldDrop []string
+	fieldDrop filter.Filter
+	FieldPass []string
+	fieldPass filter.Filter
+
+	TagDrop []TagFilter
+	TagPass []TagFilter
+
+	TagExclude []string
+	tagExclude filter.Filter
+	TagInclude []string
+	tagInclude filter.Filter
+
+	isActive bool
+}
+
+// Compile all Filter lists into filter.Filter objects.
+func (f *Filter) Compile() error {
+	if len(f.NameDrop) == 0 &&
+		len(f.NamePass) == 0 &&
+		len(f.FieldDrop) == 0 &&
+		len(f.FieldPass) == 0 &&
+		len(f.TagInclude) == 0 &&
+		len(f.TagExclude) == 0 &&
+		len(f.TagPass) == 0 &&
+		len(f.TagDrop) == 0 {
+		return nil
+	}
+
+	f.isActive = true
+	var err error
+	f.nameDrop, err = filter.Compile(f.NameDrop)
+	if err != nil {
+		return fmt.Errorf("Error compiling 'namedrop', %s", err)
+	}
+	f.namePass, err = filter.Compile(f.NamePass)
+	if err != nil {
+		return fmt.Errorf("Error compiling 'namepass', %s", err)
+	}
+
+	f.fieldDrop, err = filter.Compile(f.FieldDrop)
+	if err != nil {
+		return fmt.Errorf("Error compiling 'fielddrop', %s", err)
+	}
+	f.fieldPass, err = filter.Compile(f.FieldPass)
+	if err != nil {
+		return fmt.Errorf("Error compiling 'fieldpass', %s", err)
+	}
+
+	f.tagExclude, err = filter.Compile(f.TagExclude)
+	if err != nil {
+		return fmt.Errorf("Error compiling 'tagexclude', %s", err)
+	}
+	f.tagInclude, err = filter.Compile(f.TagInclude)
+	if err != nil {
+		return fmt.Errorf("Error compiling 'taginclude', %s", err)
+	}
+
+	for i, _ := range f.TagDrop {
+		f.TagDrop[i].filter, err = filter.Compile(f.TagDrop[i].Filter)
+		if err != nil {
+			return fmt.Errorf("Error compiling 'tagdrop', %s", err)
+		}
+	}
+	for i, _ := range f.TagPass {
+		f.TagPass[i].filter, err = filter.Compile(f.TagPass[i].Filter)
+		if err != nil {
+			return fmt.Errorf("Error compiling 'tagpass', %s", err)
+		}
+	}
+	return nil
+}
+
+// Apply applies the filter to the given measurement name, fields map, and
+// tags map. It will return false if the metric should be "filtered out", and
+// true if the metric should "pass".
+// It will modify tags & fields in-place if they need to be deleted.
+func (f *Filter) Apply(
+	measurement string,
+	fields map[string]interface{},
+	tags map[string]string,
+) bool {
+	if !f.isActive {
+		return true
+	}
+
+	// check if the measurement name should pass
+	if !f.shouldNamePass(measurement) {
+		return false
+	}
+
+	// check if the tags should pass
+	if !f.shouldTagsPass(tags) {
+		return false
+	}
+
+	// filter fields
+	for fieldkey, _ := range fields {
+		if !f.shouldFieldPass(fieldkey) {
+			delete(fields, fieldkey)
+		}
+	}
+	if len(fields) == 0 {
+		return false
+	}
+
+	// filter tags
+	f.filterTags(tags)
+
+	return true
+}
+
+func (f *Filter) IsActive() bool {
+	return f.isActive
+}
+
+// shouldNamePass returns true if the metric should pass, false if should drop
+// based on the drop/pass filter parameters
+func (f *Filter) shouldNamePass(key string) bool {
+	if f.namePass != nil {
+		if f.namePass.Match(key) {
+			return true
+		}
+		return false
+	}
+
+	if f.nameDrop != nil {
+		if f.nameDrop.Match(key) {
+			return false
+		}
+	}
+	return true
+}
+
+// shouldFieldPass returns true if the metric should pass, false if should drop
+// based on the drop/pass filter parameters
+func (f *Filter) shouldFieldPass(key string) bool {
+	if f.fieldPass != nil {
+		if f.fieldPass.Match(key) {
+			return true
+		}
+		return false
+	}
+
+	if f.fieldDrop != nil {
+		if f.fieldDrop.Match(key) {
+			return false
+		}
+	}
+	return true
+}
+
+// shouldTagsPass returns true if the metric should pass, false if should drop
+// based on the tagdrop/tagpass filter parameters
+func (f *Filter) shouldTagsPass(tags map[string]string) bool {
+	if f.TagPass != nil {
+		for _, pat := range f.TagPass {
+			if pat.filter == nil {
+				continue
+			}
+			if tagval, ok := tags[pat.Name]; ok {
+				if pat.filter.Match(tagval) {
+					return true
+				}
+			}
+		}
+		return false
+	}
+
+	if f.TagDrop != nil {
+		for _, pat := range f.TagDrop {
+			if pat.filter == nil {
+				continue
+			}
+			if tagval, ok := tags[pat.Name]; ok {
+				if pat.filter.Match(tagval) {
+					return false
+				}
+			}
+		}
+		return true
+	}
+
+	return true
+}
+
+// Apply TagInclude and TagExclude filters.
+// modifies the tags map in-place.
+func (f *Filter) filterTags(tags map[string]string) {
+	if f.tagInclude != nil {
+		for k, _ := range tags {
+			if !f.tagInclude.Match(k) {
+				delete(tags, k)
+			}
+		}
+	}
+
+	if f.tagExclude != nil {
+		for k, _ := range tags {
+			if f.tagExclude.Match(k) {
+				delete(tags, k)
+			}
+		}
+	}
+}

internal/models/filter_test.go

@@ -0,0 +1,359 @@
+package models
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestFilter_ApplyEmpty(t *testing.T) {
+	f := Filter{}
+	require.NoError(t, f.Compile())
+	assert.False(t, f.IsActive())
+
+	assert.True(t, f.Apply("m", map[string]interface{}{"value": int64(1)}, map[string]string{}))
+}
+
+func TestFilter_ApplyTagsDontPass(t *testing.T) {
+	filters := []TagFilter{
+		TagFilter{
+			Name:   "cpu",
+			Filter: []string{"cpu-*"},
+		},
+	}
+	f := Filter{
+		TagDrop: filters,
+	}
+	require.NoError(t, f.Compile())
+	require.NoError(t, f.Compile())
+	assert.True(t, f.IsActive())
+
+	assert.False(t, f.Apply("m",
+		map[string]interface{}{"value": int64(1)},
+		map[string]string{"cpu": "cpu-total"}))
+}
+
+func TestFilter_ApplyDeleteFields(t *testing.T) {
+	f := Filter{
+		FieldDrop: []string{"value"},
+	}
+	require.NoError(t, f.Compile())
+	require.NoError(t, f.Compile())
+	assert.True(t, f.IsActive())
+
+	fields := map[string]interface{}{"value": int64(1), "value2": int64(2)}
+	assert.True(t, f.Apply("m", fields, nil))
+	assert.Equal(t, map[string]interface{}{"value2": int64(2)}, fields)
+}
+
+func TestFilter_ApplyDeleteAllFields(t *testing.T) {
+	f := Filter{
+		FieldDrop: []string{"value*"},
+	}
+	require.NoError(t, f.Compile())
+	require.NoError(t, f.Compile())
+	assert.True(t, f.IsActive())
+
+	fields := map[string]interface{}{"value": int64(1), "value2": int64(2)}
+	assert.False(t, f.Apply("m", fields, nil))
+}
+
+func TestFilter_Empty(t *testing.T) {
+	f := Filter{}
+
+	measurements := []string{
+		"foo",
+		"bar",
+		"barfoo",
+		"foo_bar",
+		"foo.bar",
+		"foo-bar",
+		"supercalifradjulisticexpialidocious",
+	}
+
+	for _, measurement := range measurements {
+		if !f.shouldFieldPass(measurement) {
+			t.Errorf("Expected measurement %s to pass", measurement)
+		}
+	}
+}
+
+func TestFilter_NamePass(t *testing.T) {
+	f := Filter{
+		NamePass: []string{"foo*", "cpu_usage_idle"},
+	}
+	require.NoError(t, f.Compile())
+
+	passes := []string{
+		"foo",
+		"foo_bar",
+		"foo.bar",
+		"foo-bar",
+		"cpu_usage_idle",
+	}
+
+	drops := []string{
+		"bar",
+		"barfoo",
+		"bar_foo",
+		"cpu_usage_busy",
+	}
+
+	for _, measurement := range passes {
+		if !f.shouldNamePass(measurement) {
+			t.Errorf("Expected measurement %s to pass", measurement)
+		}
+	}
+
+	for _, measurement := range drops {
+		if f.shouldNamePass(measurement) {
+			t.Errorf("Expected measurement %s to drop", measurement)
+		}
+	}
+}
+
+func TestFilter_NameDrop(t *testing.T) {
+	f := Filter{
+		NameDrop: []string{"foo*", "cpu_usage_idle"},
+	}
+	require.NoError(t, f.Compile())
+
+	drops := []string{
+		"foo",
+		"foo_bar",
+		"foo.bar",
+		"foo-bar",
+		"cpu_usage_idle",
+	}
+
+	passes := []string{
+		"bar",
+		"barfoo",
+		"bar_foo",
+		"cpu_usage_busy",
+	}
+
+	for _, measurement := range passes {
+		if !f.shouldNamePass(measurement) {
+			t.Errorf("Expected measurement %s to pass", measurement)
+		}
+	}
+
+	for _, measurement := range drops {
+		if f.shouldNamePass(measurement) {
+			t.Errorf("Expected measurement %s to drop", measurement)
+		}
+	}
+}
+
+func TestFilter_FieldPass(t *testing.T) {
+	f := Filter{
+		FieldPass: []string{"foo*", "cpu_usage_idle"},
+	}
+	require.NoError(t, f.Compile())
+
+	passes := []string{
+		"foo",
+		"foo_bar",
+		"foo.bar",
+		"foo-bar",
+		"cpu_usage_idle",
+	}
+
+	drops := []string{
+		"bar",
+		"barfoo",
+		"bar_foo",
+		"cpu_usage_busy",
+	}
+
+	for _, measurement := range passes {
+		if !f.shouldFieldPass(measurement) {
+			t.Errorf("Expected measurement %s to pass", measurement)
+		}
+	}
+
+	for _, measurement := range drops {
+		if f.shouldFieldPass(measurement) {
+			t.Errorf("Expected measurement %s to drop", measurement)
+		}
+	}
+}
+
+func TestFilter_FieldDrop(t *testing.T) {
+	f := Filter{
+		FieldDrop: []string{"foo*", "cpu_usage_idle"},
+	}
+	require.NoError(t, f.Compile())
+
+	drops := []string{
+		"foo",
+		"foo_bar",
+		"foo.bar",
+		"foo-bar",
+		"cpu_usage_idle",
+	}
+
+	passes := []string{
+		"bar",
+		"barfoo",
+		"bar_foo",
+		"cpu_usage_busy",
+	}
+
+	for _, measurement := range passes {
+		if !f.shouldFieldPass(measurement) {
+			t.Errorf("Expected measurement %s to pass", measurement)
+		}
+	}
+
+	for _, measurement := range drops {
+		if f.shouldFieldPass(measurement) {
+			t.Errorf("Expected measurement %s to drop", measurement)
+		}
+	}
+}
+
+func TestFilter_TagPass(t *testing.T) {
+	filters := []TagFilter{
+		TagFilter{
+			Name:   "cpu",
+			Filter: []string{"cpu-*"},
+		},
+		TagFilter{
+			Name:   "mem",
+			Filter: []string{"mem_free"},
+		}}
+	f := Filter{
+		TagPass: filters,
+	}
+	require.NoError(t, f.Compile())
+
+	passes := []map[string]string{
+		{"cpu": "cpu-total"},
+		{"cpu": "cpu-0"},
+		{"cpu": "cpu-1"},
+		{"cpu": "cpu-2"},
+		{"mem": "mem_free"},
+	}
+
+	drops := []map[string]string{
+		{"cpu": "cputotal"},
+		{"cpu": "cpu0"},
+		{"cpu": "cpu1"},
+		{"cpu": "cpu2"},
+		{"mem": "mem_used"},
+	}
+
+	for _, tags := range passes {
+		if !f.shouldTagsPass(tags) {
+			t.Errorf("Expected tags %v to pass", tags)
+		}
+	}
+
+	for _, tags := range drops {
+		if f.shouldTagsPass(tags) {
+			t.Errorf("Expected tags %v to drop", tags)
+		}
+	}
+}
+
+func TestFilter_TagDrop(t *testing.T) {
+	filters := []TagFilter{
+		TagFilter{
+			Name:   "cpu",
+			Filter: []string{"cpu-*"},
+		},
+		TagFilter{
+			Name:   "mem",
+			Filter: []string{"mem_free"},
+		}}
+	f := Filter{
+		TagDrop: filters,
+	}
+	require.NoError(t, f.Compile())
+
+	drops := []map[string]string{
+		{"cpu": "cpu-total"},
+		{"cpu": "cpu-0"},
+		{"cpu": "cpu-1"},
+		{"cpu": "cpu-2"},
+		{"mem": "mem_free"},
+	}
+
+	passes := []map[string]string{
+		{"cpu": "cputotal"},
+		{"cpu": "cpu0"},
+		{"cpu": "cpu1"},
+		{"cpu": "cpu2"},
+		{"mem": "mem_used"},
+	}
+
+	for _, tags := range passes {
+		if !f.shouldTagsPass(tags) {
+			t.Errorf("Expected tags %v to pass", tags)
+		}
+	}
+
+	for _, tags := range drops {
+		if f.shouldTagsPass(tags) {
+			t.Errorf("Expected tags %v to drop", tags)
+		}
+	}
+}
+
+func TestFilter_FilterTagsNoMatches(t *testing.T) {
+	pretags := map[string]string{
+		"host":  "localhost",
+		"mytag": "foobar",
+	}
+	f := Filter{
+		TagExclude: []string{"nomatch"},
+	}
+	require.NoError(t, f.Compile())
+
+	f.filterTags(pretags)
+	assert.Equal(t, map[string]string{
+		"host":  "localhost",
+		"mytag": "foobar",
+	}, pretags)
+
+	f = Filter{
+		TagInclude: []string{"nomatch"},
+	}
+	require.NoError(t, f.Compile())
+
+	f.filterTags(pretags)
+	assert.Equal(t, map[string]string{}, pretags)
+}
+
+func TestFilter_FilterTagsMatches(t *testing.T) {
+	pretags := map[string]string{
+		"host":  "localhost",
+		"mytag": "foobar",
+	}
+	f := Filter{
+		TagExclude: []string{"ho*"},
+	}
+	require.NoError(t, f.Compile())
+
+	f.filterTags(pretags)
+	assert.Equal(t, map[string]string{
+		"mytag": "foobar",
+	}, pretags)
+
+	pretags = map[string]string{
+		"host":  "localhost",
+		"mytag": "foobar",
+	}
+	f = Filter{
+		TagInclude: []string{"my*"},
+	}
+	require.NoError(t, f.Compile())
+
+	f.filterTags(pretags)
+	assert.Equal(t, map[string]string{
+		"mytag": "foobar",
+	}, pretags)
+}

internal/models/makemetric.go

@@ -0,0 +1,143 @@
+package models
+
+import (
+	"log"
+	"math"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/metric"
+)
+
+// makemetric is used by both RunningAggregator & RunningInput
+// to make metrics.
+//   nameOverride: override the name of the measurement being made.
+//   namePrefix:   add this prefix to each measurement name.
+//   nameSuffix:   add this suffix to each measurement name.
+//   pluginTags:   these are tags that are specific to this plugin.
+//   daemonTags:   these are daemon-wide global tags, and get applied after pluginTags.
+//   filter:       this is a filter to apply to each metric being made.
+//   applyFilter:  if false, the above filter is not applied to each metric.
+//                 This is used by Aggregators, because aggregators use filters
+//                 on incoming metrics instead of on created metrics.
+// TODO refactor this to not have such a huge func signature.
+func makemetric(
+	measurement string,
+	fields map[string]interface{},
+	tags map[string]string,
+	nameOverride string,
+	namePrefix string,
+	nameSuffix string,
+	pluginTags map[string]string,
+	daemonTags map[string]string,
+	filter Filter,
+	applyFilter bool,
+	mType telegraf.ValueType,
+	t time.Time,
+) telegraf.Metric {
+	if len(fields) == 0 || len(measurement) == 0 {
+		return nil
+	}
+	if tags == nil {
+		tags = make(map[string]string)
+	}
+
+	// Override measurement name if set
+	if len(nameOverride) != 0 {
+		measurement = nameOverride
+	}
+	// Apply measurement prefix and suffix if set
+	if len(namePrefix) != 0 {
+		measurement = namePrefix + measurement
+	}
+	if len(nameSuffix) != 0 {
+		measurement = measurement + nameSuffix
+	}
+
+	// Apply plugin-wide tags if set
+	for k, v := range pluginTags {
+		if _, ok := tags[k]; !ok {
+			tags[k] = v
+		}
+	}
+	// Apply daemon-wide tags if set
+	for k, v := range daemonTags {
+		if _, ok := tags[k]; !ok {
+			tags[k] = v
+		}
+	}
+
+	// Apply the metric filter(s)
+	// for aggregators, the filter does not get applied when the metric is made.
+	// instead, the filter is applied to metric incoming into the plugin.
+	//   ie, it gets applied in the RunningAggregator.Apply function.
+	if applyFilter {
+		if ok := filter.Apply(measurement, fields, tags); !ok {
+			return nil
+		}
+	}
+
+	for k, v := range fields {
+		// Validate uint64 and float64 fields
+		// convert all int & uint types to int64
+		switch val := v.(type) {
+		case nil:
+			// delete nil fields
+			delete(fields, k)
+		case uint:
+			fields[k] = int64(val)
+			continue
+		case uint8:
+			fields[k] = int64(val)
+			continue
+		case uint16:
+			fields[k] = int64(val)
+			continue
+		case uint32:
+			fields[k] = int64(val)
+			continue
+		case int:
+			fields[k] = int64(val)
+			continue
+		case int8:
+			fields[k] = int64(val)
+			continue
+		case int16:
+			fields[k] = int64(val)
+			continue
+		case int32:
+			fields[k] = int64(val)
+			continue
+		case uint64:
+			// InfluxDB does not support writing uint64
+			if val < uint64(9223372036854775808) {
+				fields[k] = int64(val)
+			} else {
+				fields[k] = int64(9223372036854775807)
+			}
+			continue
+		case float32:
+			fields[k] = float64(val)
+			continue
+		case float64:
+			// NaNs are invalid values in influxdb, skip measurement
+			if math.IsNaN(val) || math.IsInf(val, 0) {
+				log.Printf("D! Measurement [%s] field [%s] has a NaN or Inf "+
+					"field, skipping",
+					measurement, k)
+				delete(fields, k)
+				continue
+			}
+		default:
+			fields[k] = v
+		}
+	}
+
+	m, err := metric.New(measurement, tags, fields, t, mType)
+	if err != nil {
+		log.Printf("Error adding point [%s]: %s\n", measurement, err.Error())
+		return nil
+	}
+
+	return m
+}

internal/models/running_aggregator.go

@@ -0,0 +1,164 @@
+package models
+
+import (
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/metric"
+)
+
+type RunningAggregator struct {
+	a      telegraf.Aggregator
+	Config *AggregatorConfig
+
+	metrics chan telegraf.Metric
+
+	periodStart time.Time
+	periodEnd   time.Time
+}
+
+func NewRunningAggregator(
+	a telegraf.Aggregator,
+	conf *AggregatorConfig,
+) *RunningAggregator {
+	return &RunningAggregator{
+		a:       a,
+		Config:  conf,
+		metrics: make(chan telegraf.Metric, 100),
+	}
+}
+
+// AggregatorConfig containing configuration parameters for the running
+// aggregator plugin.
+type AggregatorConfig struct {
+	Name string
+
+	DropOriginal      bool
+	NameOverride      string
+	MeasurementPrefix string
+	MeasurementSuffix string
+	Tags              map[string]string
+	Filter            Filter
+
+	Period time.Duration
+	Delay  time.Duration
+}
+
+func (r *RunningAggregator) Name() string {
+	return "aggregators." + r.Config.Name
+}
+
+func (r *RunningAggregator) MakeMetric(
+	measurement string,
+	fields map[string]interface{},
+	tags map[string]string,
+	mType telegraf.ValueType,
+	t time.Time,
+) telegraf.Metric {
+	m := makemetric(
+		measurement,
+		fields,
+		tags,
+		r.Config.NameOverride,
+		r.Config.MeasurementPrefix,
+		r.Config.MeasurementSuffix,
+		r.Config.Tags,
+		nil,
+		r.Config.Filter,
+		false,
+		mType,
+		t,
+	)
+
+	m.SetAggregate(true)
+
+	return m
+}
+
+// Add applies the given metric to the aggregator.
+// Before applying to the plugin, it will run any defined filters on the metric.
+// Apply returns true if the original metric should be dropped.
+func (r *RunningAggregator) Add(in telegraf.Metric) bool {
+	if r.Config.Filter.IsActive() {
+		// check if the aggregator should apply this metric
+		name := in.Name()
+		fields := in.Fields()
+		tags := in.Tags()
+		t := in.Time()
+		if ok := r.Config.Filter.Apply(name, fields, tags); !ok {
+			// aggregator should not apply this metric
+			return false
+		}
+
+		in, _ = metric.New(name, tags, fields, t)
+	}
+
+	r.metrics <- in
+	return r.Config.DropOriginal
+}
+func (r *RunningAggregator) add(in telegraf.Metric) {
+	r.a.Add(in)
+}
+
+func (r *RunningAggregator) push(acc telegraf.Accumulator) {
+	r.a.Push(acc)
+}
+
+func (r *RunningAggregator) reset() {
+	r.a.Reset()
+}
+
+// Run runs the running aggregator, listens for incoming metrics, and waits
+// for period ticks to tell it when to push and reset the aggregator.
+func (r *RunningAggregator) Run(
+	acc telegraf.Accumulator,
+	shutdown chan struct{},
+) {
+	// The start of the period is truncated to the nearest second.
+	//
+	// Every metric then gets it's timestamp checked and is dropped if it
+	// is not within:
+	//
+	//   start < t < end + truncation + delay
+	//
+	// So if we start at now = 00:00.2 with a 10s period and 0.3s delay:
+	//   now = 00:00.2
+	//   start = 00:00
+	//   truncation = 00:00.2
+	//   end = 00:10
+	// 1st interval: 00:00 - 00:10.5
+	// 2nd interval: 00:10 - 00:20.5
+	// etc.
+	//
+	now := time.Now()
+	r.periodStart = now.Truncate(time.Second)
+	truncation := now.Sub(r.periodStart)
+	r.periodEnd = r.periodStart.Add(r.Config.Period)
+	time.Sleep(r.Config.Delay)
+	periodT := time.NewTicker(r.Config.Period)
+	defer periodT.Stop()
+
+	for {
+		select {
+		case <-shutdown:
+			if len(r.metrics) > 0 {
+				// wait until metrics are flushed before exiting
+				continue
+			}
+			return
+		case m := <-r.metrics:
+			if m.Time().Before(r.periodStart) ||
+				m.Time().After(r.periodEnd.Add(truncation).Add(r.Config.Delay)) {
+				// the metric is outside the current aggregation period, so
+				// skip it.
+				continue
+			}
+			r.add(m)
+		case <-periodT.C:
+			r.periodStart = r.periodEnd
+			r.periodEnd = r.periodStart.Add(r.Config.Period)
+			r.push(acc)
+			r.reset()
+		}
+	}
+}

internal/models/running_aggregator_test.go

@@ -0,0 +1,256 @@
+package models
+
+import (
+	"fmt"
+	"sync"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/testutil"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAdd(t *testing.T) {
+	a := &TestAggregator{}
+	ra := NewRunningAggregator(a, &AggregatorConfig{
+		Name: "TestRunningAggregator",
+		Filter: Filter{
+			NamePass: []string{"*"},
+		},
+		Period: time.Millisecond * 500,
+	})
+	assert.NoError(t, ra.Config.Filter.Compile())
+	acc := testutil.Accumulator{}
+	go ra.Run(&acc, make(chan struct{}))
+
+	m := ra.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Untyped,
+		time.Now().Add(time.Millisecond*150),
+	)
+	assert.False(t, ra.Add(m))
+
+	for {
+		time.Sleep(time.Millisecond)
+		if atomic.LoadInt64(&a.sum) > 0 {
+			break
+		}
+	}
+	assert.Equal(t, int64(101), atomic.LoadInt64(&a.sum))
+}
+
+func TestAddMetricsOutsideCurrentPeriod(t *testing.T) {
+	a := &TestAggregator{}
+	ra := NewRunningAggregator(a, &AggregatorConfig{
+		Name: "TestRunningAggregator",
+		Filter: Filter{
+			NamePass: []string{"*"},
+		},
+		Period: time.Millisecond * 500,
+	})
+	assert.NoError(t, ra.Config.Filter.Compile())
+	acc := testutil.Accumulator{}
+	go ra.Run(&acc, make(chan struct{}))
+
+	// metric before current period
+	m := ra.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Untyped,
+		time.Now().Add(-time.Hour),
+	)
+	assert.False(t, ra.Add(m))
+
+	// metric after current period
+	m = ra.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Untyped,
+		time.Now().Add(time.Hour),
+	)
+	assert.False(t, ra.Add(m))
+
+	// "now" metric
+	m = ra.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Untyped,
+		time.Now().Add(time.Millisecond*50),
+	)
+	assert.False(t, ra.Add(m))
+
+	for {
+		time.Sleep(time.Millisecond)
+		if atomic.LoadInt64(&a.sum) > 0 {
+			break
+		}
+	}
+	assert.Equal(t, int64(101), atomic.LoadInt64(&a.sum))
+}
+
+func TestAddAndPushOnePeriod(t *testing.T) {
+	a := &TestAggregator{}
+	ra := NewRunningAggregator(a, &AggregatorConfig{
+		Name: "TestRunningAggregator",
+		Filter: Filter{
+			NamePass: []string{"*"},
+		},
+		Period: time.Millisecond * 500,
+	})
+	assert.NoError(t, ra.Config.Filter.Compile())
+	acc := testutil.Accumulator{}
+	shutdown := make(chan struct{})
+
+	var wg sync.WaitGroup
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		ra.Run(&acc, shutdown)
+	}()
+
+	m := ra.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Untyped,
+		time.Now().Add(time.Millisecond*100),
+	)
+	assert.False(t, ra.Add(m))
+
+	for {
+		time.Sleep(time.Millisecond)
+		if acc.NMetrics() > 0 {
+			break
+		}
+	}
+	acc.AssertContainsFields(t, "TestMetric", map[string]interface{}{"sum": int64(101)})
+
+	close(shutdown)
+	wg.Wait()
+}
+
+func TestAddDropOriginal(t *testing.T) {
+	ra := NewRunningAggregator(&TestAggregator{}, &AggregatorConfig{
+		Name: "TestRunningAggregator",
+		Filter: Filter{
+			NamePass: []string{"RI*"},
+		},
+		DropOriginal: true,
+	})
+	assert.NoError(t, ra.Config.Filter.Compile())
+
+	m := ra.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Untyped,
+		time.Now(),
+	)
+	assert.True(t, ra.Add(m))
+
+	// this metric name doesn't match the filter, so Add will return false
+	m2 := ra.MakeMetric(
+		"foobar",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Untyped,
+		time.Now(),
+	)
+	assert.False(t, ra.Add(m2))
+}
+
+// make an untyped, counter, & gauge metric
+func TestMakeMetricA(t *testing.T) {
+	now := time.Now()
+	ra := NewRunningAggregator(&TestAggregator{}, &AggregatorConfig{
+		Name: "TestRunningAggregator",
+	})
+	assert.Equal(t, "aggregators.TestRunningAggregator", ra.Name())
+
+	m := ra.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Untyped,
+		now,
+	)
+	assert.Equal(
+		t,
+		fmt.Sprintf("RITest value=101i %d\n", now.UnixNano()),
+		m.String(),
+	)
+	assert.Equal(
+		t,
+		m.Type(),
+		telegraf.Untyped,
+	)
+
+	m = ra.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Counter,
+		now,
+	)
+	assert.Equal(
+		t,
+		fmt.Sprintf("RITest value=101i %d\n", now.UnixNano()),
+		m.String(),
+	)
+	assert.Equal(
+		t,
+		m.Type(),
+		telegraf.Counter,
+	)
+
+	m = ra.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Gauge,
+		now,
+	)
+	assert.Equal(
+		t,
+		fmt.Sprintf("RITest value=101i %d\n", now.UnixNano()),
+		m.String(),
+	)
+	assert.Equal(
+		t,
+		m.Type(),
+		telegraf.Gauge,
+	)
+}
+
+type TestAggregator struct {
+	sum int64
+}
+
+func (t *TestAggregator) Description() string  { return "" }
+func (t *TestAggregator) SampleConfig() string { return "" }
+func (t *TestAggregator) Reset() {
+	atomic.StoreInt64(&t.sum, 0)
+}
+
+func (t *TestAggregator) Push(acc telegraf.Accumulator) {
+	acc.AddFields("TestMetric",
+		map[string]interface{}{"sum": t.sum},
+		map[string]string{},
+	)
+}
+
+func (t *TestAggregator) Add(in telegraf.Metric) {
+	for _, v := range in.Fields() {
+		if vi, ok := v.(int64); ok {
+			atomic.AddInt64(&t.sum, vi)
+		}
+	}
+}

internal/models/running_input.go

@@ -0,0 +1,96 @@
+package models
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/selfstat"
+)
+
+var GlobalMetricsGathered = selfstat.Register("agent", "metrics_gathered", map[string]string{})
+
+type RunningInput struct {
+	Input  telegraf.Input
+	Config *InputConfig
+
+	trace       bool
+	defaultTags map[string]string
+
+	MetricsGathered selfstat.Stat
+}
+
+func NewRunningInput(
+	input telegraf.Input,
+	config *InputConfig,
+) *RunningInput {
+	return &RunningInput{
+		Input:  input,
+		Config: config,
+		MetricsGathered: selfstat.Register(
+			"gather",
+			"metrics_gathered",
+			map[string]string{"input": config.Name},
+		),
+	}
+}
+
+// InputConfig containing a name, interval, and filter
+type InputConfig struct {
+	Name              string
+	NameOverride      string
+	MeasurementPrefix string
+	MeasurementSuffix string
+	Tags              map[string]string
+	Filter            Filter
+	Interval          time.Duration
+}
+
+func (r *RunningInput) Name() string {
+	return "inputs." + r.Config.Name
+}
+
+// MakeMetric either returns a metric, or returns nil if the metric doesn't
+// need to be created (because of filtering, an error, etc.)
+func (r *RunningInput) MakeMetric(
+	measurement string,
+	fields map[string]interface{},
+	tags map[string]string,
+	mType telegraf.ValueType,
+	t time.Time,
+) telegraf.Metric {
+	m := makemetric(
+		measurement,
+		fields,
+		tags,
+		r.Config.NameOverride,
+		r.Config.MeasurementPrefix,
+		r.Config.MeasurementSuffix,
+		r.Config.Tags,
+		r.defaultTags,
+		r.Config.Filter,
+		true,
+		mType,
+		t,
+	)
+
+	if r.trace && m != nil {
+		fmt.Println("> " + m.String())
+	}
+
+	r.MetricsGathered.Incr(1)
+	GlobalMetricsGathered.Incr(1)
+	return m
+}
+
+func (r *RunningInput) Trace() bool {
+	return r.trace
+}
+
+func (r *RunningInput) SetTrace(trace bool) {
+	r.trace = trace
+}
+
+func (r *RunningInput) SetDefaultTags(tags map[string]string) {
+	r.defaultTags = tags
+}

internal/models/running_input_test.go

@@ -0,0 +1,339 @@
+package models
+
+import (
+	"fmt"
+	"math"
+	"testing"
+	"time"
+
+	"github.com/influxdata/telegraf"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMakeMetricNoFields(t *testing.T) {
+	now := time.Now()
+	ri := NewRunningInput(&testInput{}, &InputConfig{
+		Name: "TestRunningInput",
+	})
+
+	m := ri.MakeMetric(
+		"RITest",
+		map[string]interface{}{},
+		map[string]string{},
+		telegraf.Untyped,
+		now,
+	)
+	assert.Nil(t, m)
+}
+
+// nil fields should get dropped
+func TestMakeMetricNilFields(t *testing.T) {
+	now := time.Now()
+	ri := NewRunningInput(&testInput{}, &InputConfig{
+		Name: "TestRunningInput",
+	})
+
+	m := ri.MakeMetric(
+		"RITest",
+		map[string]interface{}{
+			"value": int(101),
+			"nil":   nil,
+		},
+		map[string]string{},
+		telegraf.Untyped,
+		now,
+	)
+	assert.Equal(
+		t,
+		fmt.Sprintf("RITest value=101i %d\n", now.UnixNano()),
+		m.String(),
+	)
+}
+
+// make an untyped, counter, & gauge metric
+func TestMakeMetric(t *testing.T) {
+	now := time.Now()
+	ri := NewRunningInput(&testInput{}, &InputConfig{
+		Name: "TestRunningInput",
+	})
+
+	ri.SetTrace(true)
+	assert.Equal(t, true, ri.Trace())
+	assert.Equal(t, "inputs.TestRunningInput", ri.Name())
+
+	m := ri.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Untyped,
+		now,
+	)
+	assert.Equal(
+		t,
+		fmt.Sprintf("RITest value=101i %d\n", now.UnixNano()),
+		m.String(),
+	)
+	assert.Equal(
+		t,
+		m.Type(),
+		telegraf.Untyped,
+	)
+
+	m = ri.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Counter,
+		now,
+	)
+	assert.Equal(
+		t,
+		fmt.Sprintf("RITest value=101i %d\n", now.UnixNano()),
+		m.String(),
+	)
+	assert.Equal(
+		t,
+		m.Type(),
+		telegraf.Counter,
+	)
+
+	m = ri.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Gauge,
+		now,
+	)
+	assert.Equal(
+		t,
+		fmt.Sprintf("RITest value=101i %d\n", now.UnixNano()),
+		m.String(),
+	)
+	assert.Equal(
+		t,
+		m.Type(),
+		telegraf.Gauge,
+	)
+}
+
+func TestMakeMetricWithPluginTags(t *testing.T) {
+	now := time.Now()
+	ri := NewRunningInput(&testInput{}, &InputConfig{
+		Name: "TestRunningInput",
+		Tags: map[string]string{
+			"foo": "bar",
+		},
+	})
+
+	ri.SetTrace(true)
+	assert.Equal(t, true, ri.Trace())
+
+	m := ri.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		nil,
+		telegraf.Untyped,
+		now,
+	)
+	assert.Equal(
+		t,
+		fmt.Sprintf("RITest,foo=bar value=101i %d\n", now.UnixNano()),
+		m.String(),
+	)
+}
+
+func TestMakeMetricFilteredOut(t *testing.T) {
+	now := time.Now()
+	ri := NewRunningInput(&testInput{}, &InputConfig{
+		Name: "TestRunningInput",
+		Tags: map[string]string{
+			"foo": "bar",
+		},
+		Filter: Filter{NamePass: []string{"foobar"}},
+	})
+
+	ri.SetTrace(true)
+	assert.Equal(t, true, ri.Trace())
+	assert.NoError(t, ri.Config.Filter.Compile())
+
+	m := ri.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		nil,
+		telegraf.Untyped,
+		now,
+	)
+	assert.Nil(t, m)
+}
+
+func TestMakeMetricWithDaemonTags(t *testing.T) {
+	now := time.Now()
+	ri := NewRunningInput(&testInput{}, &InputConfig{
+		Name: "TestRunningInput",
+	})
+	ri.SetDefaultTags(map[string]string{
+		"foo": "bar",
+	})
+
+	ri.SetTrace(true)
+	assert.Equal(t, true, ri.Trace())
+
+	m := ri.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Untyped,
+		now,
+	)
+	assert.Equal(
+		t,
+		fmt.Sprintf("RITest,foo=bar value=101i %d\n", now.UnixNano()),
+		m.String(),
+	)
+}
+
+// make an untyped, counter, & gauge metric
+func TestMakeMetricInfFields(t *testing.T) {
+	inf := math.Inf(1)
+	ninf := math.Inf(-1)
+	now := time.Now()
+	ri := NewRunningInput(&testInput{}, &InputConfig{
+		Name: "TestRunningInput",
+	})
+
+	ri.SetTrace(true)
+	assert.Equal(t, true, ri.Trace())
+
+	m := ri.MakeMetric(
+		"RITest",
+		map[string]interface{}{
+			"value": int(101),
+			"inf":   inf,
+			"ninf":  ninf,
+		},
+		map[string]string{},
+		telegraf.Untyped,
+		now,
+	)
+	assert.Equal(
+		t,
+		fmt.Sprintf("RITest value=101i %d\n", now.UnixNano()),
+		m.String(),
+	)
+}
+
+func TestMakeMetricAllFieldTypes(t *testing.T) {
+	now := time.Now()
+	ri := NewRunningInput(&testInput{}, &InputConfig{
+		Name: "TestRunningInput",
+	})
+
+	ri.SetTrace(true)
+	assert.Equal(t, true, ri.Trace())
+
+	m := ri.MakeMetric(
+		"RITest",
+		map[string]interface{}{
+			"a": int(10),
+			"b": int8(10),
+			"c": int16(10),
+			"d": int32(10),
+			"e": uint(10),
+			"f": uint8(10),
+			"g": uint16(10),
+			"h": uint32(10),
+			"i": uint64(10),
+			"j": float32(10),
+			"k": uint64(9223372036854775810),
+			"l": "foobar",
+			"m": true,
+		},
+		map[string]string{},
+		telegraf.Untyped,
+		now,
+	)
+	assert.Contains(t, m.String(), "a=10i")
+	assert.Contains(t, m.String(), "b=10i")
+	assert.Contains(t, m.String(), "c=10i")
+	assert.Contains(t, m.String(), "d=10i")
+	assert.Contains(t, m.String(), "e=10i")
+	assert.Contains(t, m.String(), "f=10i")
+	assert.Contains(t, m.String(), "g=10i")
+	assert.Contains(t, m.String(), "h=10i")
+	assert.Contains(t, m.String(), "i=10i")
+	assert.Contains(t, m.String(), "j=10")
+	assert.NotContains(t, m.String(), "j=10i")
+	assert.Contains(t, m.String(), "k=9223372036854775807i")
+	assert.Contains(t, m.String(), "l=\"foobar\"")
+	assert.Contains(t, m.String(), "m=true")
+}
+
+func TestMakeMetricNameOverride(t *testing.T) {
+	now := time.Now()
+	ri := NewRunningInput(&testInput{}, &InputConfig{
+		Name:         "TestRunningInput",
+		NameOverride: "foobar",
+	})
+
+	m := ri.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Untyped,
+		now,
+	)
+	assert.Equal(
+		t,
+		fmt.Sprintf("foobar value=101i %d\n", now.UnixNano()),
+		m.String(),
+	)
+}
+
+func TestMakeMetricNamePrefix(t *testing.T) {
+	now := time.Now()
+	ri := NewRunningInput(&testInput{}, &InputConfig{
+		Name:              "TestRunningInput",
+		MeasurementPrefix: "foobar_",
+	})
+
+	m := ri.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Untyped,
+		now,
+	)
+	assert.Equal(
+		t,
+		fmt.Sprintf("foobar_RITest value=101i %d\n", now.UnixNano()),
+		m.String(),
+	)
+}
+
+func TestMakeMetricNameSuffix(t *testing.T) {
+	now := time.Now()
+	ri := NewRunningInput(&testInput{}, &InputConfig{
+		Name:              "TestRunningInput",
+		MeasurementSuffix: "_foobar",
+	})
+
+	m := ri.MakeMetric(
+		"RITest",
+		map[string]interface{}{"value": int(101)},
+		map[string]string{},
+		telegraf.Untyped,
+		now,
+	)
+	assert.Equal(
+		t,
+		fmt.Sprintf("RITest_foobar value=101i %d\n", now.UnixNano()),
+		m.String(),
+	)
+}
+
+type testInput struct{}
+
+func (t *testInput) Description() string                   { return "" }
+func (t *testInput) SampleConfig() string                  { return "" }
+func (t *testInput) Gather(acc telegraf.Accumulator) error { return nil }

internal/models/running_output.go

@@ -0,0 +1,186 @@
+package models
+
+import (
+	"log"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/internal/buffer"
+	"github.com/influxdata/telegraf/metric"
+	"github.com/influxdata/telegraf/selfstat"
+)
+
+const (
+	// Default size of metrics batch size.
+	DEFAULT_METRIC_BATCH_SIZE = 1000
+
+	// Default number of metrics kept. It should be a multiple of batch size.
+	DEFAULT_METRIC_BUFFER_LIMIT = 10000
+)
+
+// RunningOutput contains the output configuration
+type RunningOutput struct {
+	Name              string
+	Output            telegraf.Output
+	Config            *OutputConfig
+	MetricBufferLimit int
+	MetricBatchSize   int
+
+	MetricsFiltered selfstat.Stat
+	MetricsWritten  selfstat.Stat
+	BufferSize      selfstat.Stat
+	BufferLimit     selfstat.Stat
+	WriteTime       selfstat.Stat
+
+	metrics     *buffer.Buffer
+	failMetrics *buffer.Buffer
+}
+
+func NewRunningOutput(
+	name string,
+	output telegraf.Output,
+	conf *OutputConfig,
+	batchSize int,
+	bufferLimit int,
+) *RunningOutput {
+	if bufferLimit == 0 {
+		bufferLimit = DEFAULT_METRIC_BUFFER_LIMIT
+	}
+	if batchSize == 0 {
+		batchSize = DEFAULT_METRIC_BATCH_SIZE
+	}
+	ro := &RunningOutput{
+		Name:              name,
+		metrics:           buffer.NewBuffer(batchSize),
+		failMetrics:       buffer.NewBuffer(bufferLimit),
+		Output:            output,
+		Config:            conf,
+		MetricBufferLimit: bufferLimit,
+		MetricBatchSize:   batchSize,
+		MetricsWritten: selfstat.Register(
+			"write",
+			"metrics_written",
+			map[string]string{"output": name},
+		),
+		MetricsFiltered: selfstat.Register(
+			"write",
+			"metrics_filtered",
+			map[string]string{"output": name},
+		),
+		BufferSize: selfstat.Register(
+			"write",
+			"buffer_size",
+			map[string]string{"output": name},
+		),
+		BufferLimit: selfstat.Register(
+			"write",
+			"buffer_limit",
+			map[string]string{"output": name},
+		),
+		WriteTime: selfstat.RegisterTiming(
+			"write",
+			"write_time_ns",
+			map[string]string{"output": name},
+		),
+	}
+	ro.BufferLimit.Incr(int64(ro.MetricBufferLimit))
+	return ro
+}
+
+// AddMetric adds a metric to the output. This function can also write cached
+// points if FlushBufferWhenFull is true.
+func (ro *RunningOutput) AddMetric(m telegraf.Metric) {
+	// Filter any tagexclude/taginclude parameters before adding metric
+	if ro.Config.Filter.IsActive() {
+		// In order to filter out tags, we need to create a new metric, since
+		// metrics are immutable once created.
+		name := m.Name()
+		tags := m.Tags()
+		fields := m.Fields()
+		t := m.Time()
+		if ok := ro.Config.Filter.Apply(name, fields, tags); !ok {
+			ro.MetricsFiltered.Incr(1)
+			return
+		}
+		// error is not possible if creating from another metric, so ignore.
+		m, _ = metric.New(name, tags, fields, t)
+	}
+
+	ro.metrics.Add(m)
+	if ro.metrics.Len() == ro.MetricBatchSize {
+		batch := ro.metrics.Batch(ro.MetricBatchSize)
+		err := ro.write(batch)
+		if err != nil {
+			ro.failMetrics.Add(batch...)
+		}
+	}
+}
+
+// Write writes all cached points to this output.
+func (ro *RunningOutput) Write() error {
+	nFails, nMetrics := ro.failMetrics.Len(), ro.metrics.Len()
+	log.Printf("D! Output [%s] buffer fullness: %d / %d metrics. ",
+		ro.Name, nFails+nMetrics, ro.MetricBufferLimit)
+	ro.BufferSize.Incr(int64(nFails + nMetrics))
+	var err error
+	if !ro.failMetrics.IsEmpty() {
+		// how many batches of failed writes we need to write.
+		nBatches := nFails/ro.MetricBatchSize + 1
+		batchSize := ro.MetricBatchSize
+
+		for i := 0; i < nBatches; i++ {
+			// If it's the last batch, only grab the metrics that have not had
+			// a write attempt already (this is primarily to preserve order).
+			if i == nBatches-1 {
+				batchSize = nFails % ro.MetricBatchSize
+			}
+			batch := ro.failMetrics.Batch(batchSize)
+			// If we've already failed previous writes, don't bother trying to
+			// write to this output again. We are not exiting the loop just so
+			// that we can rotate the metrics to preserve order.
+			if err == nil {
+				err = ro.write(batch)
+			}
+			if err != nil {
+				ro.failMetrics.Add(batch...)
+			}
+		}
+	}
+
+	batch := ro.metrics.Batch(ro.MetricBatchSize)
+	// see comment above about not trying to write to an already failed output.
+	// if ro.failMetrics is empty then err will always be nil at this point.
+	if err == nil {
+		err = ro.write(batch)
+	}
+
+	if err != nil {
+		ro.failMetrics.Add(batch...)
+		return err
+	}
+	return nil
+}
+
+func (ro *RunningOutput) write(metrics []telegraf.Metric) error {
+	nMetrics := len(metrics)
+	if nMetrics == 0 {
+		return nil
+	}
+	start := time.Now()
+	err := ro.Output.Write(metrics)
+	elapsed := time.Since(start)
+	if err == nil {
+		log.Printf("D! Output [%s] wrote batch of %d metrics in %s\n",
+			ro.Name, nMetrics, elapsed)
+		ro.MetricsWritten.Incr(int64(nMetrics))
+		ro.BufferSize.Incr(-int64(nMetrics))
+		ro.WriteTime.Incr(elapsed.Nanoseconds())
+	}
+	return err
+}
+
+// OutputConfig containing name and filter
+type OutputConfig struct {
+	Name   string
+	Filter Filter
+}

internal/models/running_output_test.go

@@ -0,0 +1,539 @@
+package models
+
+import (
+	"fmt"
+	"sync"
+	"testing"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/testutil"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+var first5 = []telegraf.Metric{
+	testutil.TestMetric(101, "metric1"),
+	testutil.TestMetric(101, "metric2"),
+	testutil.TestMetric(101, "metric3"),
+	testutil.TestMetric(101, "metric4"),
+	testutil.TestMetric(101, "metric5"),
+}
+
+var next5 = []telegraf.Metric{
+	testutil.TestMetric(101, "metric6"),
+	testutil.TestMetric(101, "metric7"),
+	testutil.TestMetric(101, "metric8"),
+	testutil.TestMetric(101, "metric9"),
+	testutil.TestMetric(101, "metric10"),
+}
+
+// Benchmark adding metrics.
+func BenchmarkRunningOutputAddWrite(b *testing.B) {
+	conf := &OutputConfig{
+		Filter: Filter{},
+	}
+
+	m := &perfOutput{}
+	ro := NewRunningOutput("test", m, conf, 1000, 10000)
+
+	for n := 0; n < b.N; n++ {
+		ro.AddMetric(testutil.TestMetric(101, "metric1"))
+		ro.Write()
+	}
+}
+
+// Benchmark adding metrics.
+func BenchmarkRunningOutputAddWriteEvery100(b *testing.B) {
+	conf := &OutputConfig{
+		Filter: Filter{},
+	}
+
+	m := &perfOutput{}
+	ro := NewRunningOutput("test", m, conf, 1000, 10000)
+
+	for n := 0; n < b.N; n++ {
+		ro.AddMetric(testutil.TestMetric(101, "metric1"))
+		if n%100 == 0 {
+			ro.Write()
+		}
+	}
+}
+
+// Benchmark adding metrics.
+func BenchmarkRunningOutputAddFailWrites(b *testing.B) {
+	conf := &OutputConfig{
+		Filter: Filter{},
+	}
+
+	m := &perfOutput{}
+	m.failWrite = true
+	ro := NewRunningOutput("test", m, conf, 1000, 10000)
+
+	for n := 0; n < b.N; n++ {
+		ro.AddMetric(testutil.TestMetric(101, "metric1"))
+	}
+}
+
+// Test that NameDrop filters ger properly applied.
+func TestRunningOutput_DropFilter(t *testing.T) {
+	conf := &OutputConfig{
+		Filter: Filter{
+			NameDrop: []string{"metric1", "metric2"},
+		},
+	}
+	assert.NoError(t, conf.Filter.Compile())
+
+	m := &mockOutput{}
+	ro := NewRunningOutput("test", m, conf, 1000, 10000)
+
+	for _, metric := range first5 {
+		ro.AddMetric(metric)
+	}
+	for _, metric := range next5 {
+		ro.AddMetric(metric)
+	}
+	assert.Len(t, m.Metrics(), 0)
+
+	err := ro.Write()
+	assert.NoError(t, err)
+	assert.Len(t, m.Metrics(), 8)
+}
+
+// Test that NameDrop filters without a match do nothing.
+func TestRunningOutput_PassFilter(t *testing.T) {
+	conf := &OutputConfig{
+		Filter: Filter{
+			NameDrop: []string{"metric1000", "foo*"},
+		},
+	}
+	assert.NoError(t, conf.Filter.Compile())
+
+	m := &mockOutput{}
+	ro := NewRunningOutput("test", m, conf, 1000, 10000)
+
+	for _, metric := range first5 {
+		ro.AddMetric(metric)
+	}
+	for _, metric := range next5 {
+		ro.AddMetric(metric)
+	}
+	assert.Len(t, m.Metrics(), 0)
+
+	err := ro.Write()
+	assert.NoError(t, err)
+	assert.Len(t, m.Metrics(), 10)
+}
+
+// Test that tags are properly included
+func TestRunningOutput_TagIncludeNoMatch(t *testing.T) {
+	conf := &OutputConfig{
+		Filter: Filter{
+			TagInclude: []string{"nothing*"},
+		},
+	}
+	assert.NoError(t, conf.Filter.Compile())
+
+	m := &mockOutput{}
+	ro := NewRunningOutput("test", m, conf, 1000, 10000)
+
+	ro.AddMetric(testutil.TestMetric(101, "metric1"))
+	assert.Len(t, m.Metrics(), 0)
+
+	err := ro.Write()
+	assert.NoError(t, err)
+	assert.Len(t, m.Metrics(), 1)
+	assert.Empty(t, m.Metrics()[0].Tags())
+}
+
+// Test that tags are properly excluded
+func TestRunningOutput_TagExcludeMatch(t *testing.T) {
+	conf := &OutputConfig{
+		Filter: Filter{
+			TagExclude: []string{"tag*"},
+		},
+	}
+	assert.NoError(t, conf.Filter.Compile())
+
+	m := &mockOutput{}
+	ro := NewRunningOutput("test", m, conf, 1000, 10000)
+
+	ro.AddMetric(testutil.TestMetric(101, "metric1"))
+	assert.Len(t, m.Metrics(), 0)
+
+	err := ro.Write()
+	assert.NoError(t, err)
+	assert.Len(t, m.Metrics(), 1)
+	assert.Len(t, m.Metrics()[0].Tags(), 0)
+}
+
+// Test that tags are properly Excluded
+func TestRunningOutput_TagExcludeNoMatch(t *testing.T) {
+	conf := &OutputConfig{
+		Filter: Filter{
+			TagExclude: []string{"nothing*"},
+		},
+	}
+	assert.NoError(t, conf.Filter.Compile())
+
+	m := &mockOutput{}
+	ro := NewRunningOutput("test", m, conf, 1000, 10000)
+
+	ro.AddMetric(testutil.TestMetric(101, "metric1"))
+	assert.Len(t, m.Metrics(), 0)
+
+	err := ro.Write()
+	assert.NoError(t, err)
+	assert.Len(t, m.Metrics(), 1)
+	assert.Len(t, m.Metrics()[0].Tags(), 1)
+}
+
+// Test that tags are properly included
+func TestRunningOutput_TagIncludeMatch(t *testing.T) {
+	conf := &OutputConfig{
+		Filter: Filter{
+			TagInclude: []string{"tag*"},
+		},
+	}
+	assert.NoError(t, conf.Filter.Compile())
+
+	m := &mockOutput{}
+	ro := NewRunningOutput("test", m, conf, 1000, 10000)
+
+	ro.AddMetric(testutil.TestMetric(101, "metric1"))
+	assert.Len(t, m.Metrics(), 0)
+
+	err := ro.Write()
+	assert.NoError(t, err)
+	assert.Len(t, m.Metrics(), 1)
+	assert.Len(t, m.Metrics()[0].Tags(), 1)
+}
+
+// Test that we can write metrics with simple default setup.
+func TestRunningOutputDefault(t *testing.T) {
+	conf := &OutputConfig{
+		Filter: Filter{},
+	}
+
+	m := &mockOutput{}
+	ro := NewRunningOutput("test", m, conf, 1000, 10000)
+
+	for _, metric := range first5 {
+		ro.AddMetric(metric)
+	}
+	for _, metric := range next5 {
+		ro.AddMetric(metric)
+	}
+	assert.Len(t, m.Metrics(), 0)
+
+	err := ro.Write()
+	assert.NoError(t, err)
+	assert.Len(t, m.Metrics(), 10)
+}
+
+// Test that running output doesn't flush until it's full when
+// FlushBufferWhenFull is set.
+func TestRunningOutputFlushWhenFull(t *testing.T) {
+	conf := &OutputConfig{
+		Filter: Filter{},
+	}
+
+	m := &mockOutput{}
+	ro := NewRunningOutput("test", m, conf, 6, 10)
+
+	// Fill buffer to 1 under limit
+	for _, metric := range first5 {
+		ro.AddMetric(metric)
+	}
+	// no flush yet
+	assert.Len(t, m.Metrics(), 0)
+
+	// add one more metric
+	ro.AddMetric(next5[0])
+	// now it flushed
+	assert.Len(t, m.Metrics(), 6)
+
+	// add one more metric and write it manually
+	ro.AddMetric(next5[1])
+	err := ro.Write()
+	assert.NoError(t, err)
+	assert.Len(t, m.Metrics(), 7)
+}
+
+// Test that running output doesn't flush until it's full when
+// FlushBufferWhenFull is set, twice.
+func TestRunningOutputMultiFlushWhenFull(t *testing.T) {
+	conf := &OutputConfig{
+		Filter: Filter{},
+	}
+
+	m := &mockOutput{}
+	ro := NewRunningOutput("test", m, conf, 4, 12)
+
+	// Fill buffer past limit twive
+	for _, metric := range first5 {
+		ro.AddMetric(metric)
+	}
+	for _, metric := range next5 {
+		ro.AddMetric(metric)
+	}
+	// flushed twice
+	assert.Len(t, m.Metrics(), 8)
+}
+
+func TestRunningOutputWriteFail(t *testing.T) {
+	conf := &OutputConfig{
+		Filter: Filter{},
+	}
+
+	m := &mockOutput{}
+	m.failWrite = true
+	ro := NewRunningOutput("test", m, conf, 4, 12)
+
+	// Fill buffer to limit twice
+	for _, metric := range first5 {
+		ro.AddMetric(metric)
+	}
+	for _, metric := range next5 {
+		ro.AddMetric(metric)
+	}
+	// no successful flush yet
+	assert.Len(t, m.Metrics(), 0)
+
+	// manual write fails
+	err := ro.Write()
+	require.Error(t, err)
+	// no successful flush yet
+	assert.Len(t, m.Metrics(), 0)
+
+	m.failWrite = false
+	err = ro.Write()
+	require.NoError(t, err)
+
+	assert.Len(t, m.Metrics(), 10)
+}
+
+// Verify that the order of points is preserved during a write failure.
+func TestRunningOutputWriteFailOrder(t *testing.T) {
+	conf := &OutputConfig{
+		Filter: Filter{},
+	}
+
+	m := &mockOutput{}
+	m.failWrite = true
+	ro := NewRunningOutput("test", m, conf, 100, 1000)
+
+	// add 5 metrics
+	for _, metric := range first5 {
+		ro.AddMetric(metric)
+	}
+	// no successful flush yet
+	assert.Len(t, m.Metrics(), 0)
+
+	// Write fails
+	err := ro.Write()
+	require.Error(t, err)
+	// no successful flush yet
+	assert.Len(t, m.Metrics(), 0)
+
+	m.failWrite = false
+	// add 5 more metrics
+	for _, metric := range next5 {
+		ro.AddMetric(metric)
+	}
+	err = ro.Write()
+	require.NoError(t, err)
+
+	// Verify that 10 metrics were written
+	assert.Len(t, m.Metrics(), 10)
+	// Verify that they are in order
+	expected := append(first5, next5...)
+	assert.Equal(t, expected, m.Metrics())
+}
+
+// Verify that the order of points is preserved during many write failures.
+func TestRunningOutputWriteFailOrder2(t *testing.T) {
+	conf := &OutputConfig{
+		Filter: Filter{},
+	}
+
+	m := &mockOutput{}
+	m.failWrite = true
+	ro := NewRunningOutput("test", m, conf, 5, 100)
+
+	// add 5 metrics
+	for _, metric := range first5 {
+		ro.AddMetric(metric)
+	}
+	// Write fails
+	err := ro.Write()
+	require.Error(t, err)
+	// no successful flush yet
+	assert.Len(t, m.Metrics(), 0)
+
+	// add 5 metrics
+	for _, metric := range next5 {
+		ro.AddMetric(metric)
+	}
+	// Write fails
+	err = ro.Write()
+	require.Error(t, err)
+	// no successful flush yet
+	assert.Len(t, m.Metrics(), 0)
+
+	// add 5 metrics
+	for _, metric := range first5 {
+		ro.AddMetric(metric)
+	}
+	// Write fails
+	err = ro.Write()
+	require.Error(t, err)
+	// no successful flush yet
+	assert.Len(t, m.Metrics(), 0)
+
+	// add 5 metrics
+	for _, metric := range next5 {
+		ro.AddMetric(metric)
+	}
+	// Write fails
+	err = ro.Write()
+	require.Error(t, err)
+	// no successful flush yet
+	assert.Len(t, m.Metrics(), 0)
+
+	m.failWrite = false
+	err = ro.Write()
+	require.NoError(t, err)
+
+	// Verify that 10 metrics were written
+	assert.Len(t, m.Metrics(), 20)
+	// Verify that they are in order
+	expected := append(first5, next5...)
+	expected = append(expected, first5...)
+	expected = append(expected, next5...)
+	assert.Equal(t, expected, m.Metrics())
+}
+
+// Verify that the order of points is preserved when there is a remainder
+// of points for the batch.
+//
+// ie, with a batch size of 5:
+//
+//     1 2 3 4 5 6 <-- order, failed points
+//     6 1 2 3 4 5 <-- order, after 1st write failure (1 2 3 4 5 was batch)
+//     1 2 3 4 5 6 <-- order, after 2nd write failure, (6 was batch)
+//
+func TestRunningOutputWriteFailOrder3(t *testing.T) {
+	conf := &OutputConfig{
+		Filter: Filter{},
+	}
+
+	m := &mockOutput{}
+	m.failWrite = true
+	ro := NewRunningOutput("test", m, conf, 5, 1000)
+
+	// add 5 metrics
+	for _, metric := range first5 {
+		ro.AddMetric(metric)
+	}
+	// no successful flush yet
+	assert.Len(t, m.Metrics(), 0)
+
+	// Write fails
+	err := ro.Write()
+	require.Error(t, err)
+	// no successful flush yet
+	assert.Len(t, m.Metrics(), 0)
+
+	// add and attempt to write a single metric:
+	ro.AddMetric(next5[0])
+	err = ro.Write()
+	require.Error(t, err)
+
+	// unset fail and write metrics
+	m.failWrite = false
+	err = ro.Write()
+	require.NoError(t, err)
+
+	// Verify that 6 metrics were written
+	assert.Len(t, m.Metrics(), 6)
+	// Verify that they are in order
+	expected := append(first5, next5[0])
+	assert.Equal(t, expected, m.Metrics())
+}
+
+type mockOutput struct {
+	sync.Mutex
+
+	metrics []telegraf.Metric
+
+	// if true, mock a write failure
+	failWrite bool
+}
+
+func (m *mockOutput) Connect() error {
+	return nil
+}
+
+func (m *mockOutput) Close() error {
+	return nil
+}
+
+func (m *mockOutput) Description() string {
+	return ""
+}
+
+func (m *mockOutput) SampleConfig() string {
+	return ""
+}
+
+func (m *mockOutput) Write(metrics []telegraf.Metric) error {
+	m.Lock()
+	defer m.Unlock()
+	if m.failWrite {
+		return fmt.Errorf("Failed Write!")
+	}
+
+	if m.metrics == nil {
+		m.metrics = []telegraf.Metric{}
+	}
+
+	for _, metric := range metrics {
+		m.metrics = append(m.metrics, metric)
+	}
+	return nil
+}
+
+func (m *mockOutput) Metrics() []telegraf.Metric {
+	m.Lock()
+	defer m.Unlock()
+	return m.metrics
+}
+
+type perfOutput struct {
+	// if true, mock a write failure
+	failWrite bool
+}
+
+func (m *perfOutput) Connect() error {
+	return nil
+}
+
+func (m *perfOutput) Close() error {
+	return nil
+}
+
+func (m *perfOutput) Description() string {
+	return ""
+}
+
+func (m *perfOutput) SampleConfig() string {
+	return ""
+}
+
+func (m *perfOutput) Write(metrics []telegraf.Metric) error {
+	if m.failWrite {
+		return fmt.Errorf("Failed Write!")
+	}
+	return nil
+}

internal/models/running_processor.go

@@ -0,0 +1,44 @@
+package models
+
+import (
+	"github.com/influxdata/telegraf"
+)
+
+type RunningProcessor struct {
+	Name      string
+	Processor telegraf.Processor
+	Config    *ProcessorConfig
+}
+
+type RunningProcessors []*RunningProcessor
+
+func (rp RunningProcessors) Len() int           { return len(rp) }
+func (rp RunningProcessors) Swap(i, j int)      { rp[i], rp[j] = rp[j], rp[i] }
+func (rp RunningProcessors) Less(i, j int) bool { return rp[i].Config.Order < rp[j].Config.Order }
+
+// FilterConfig containing a name and filter
+type ProcessorConfig struct {
+	Name   string
+	Order  int64
+	Filter Filter
+}
+
+func (rp *RunningProcessor) Apply(in ...telegraf.Metric) []telegraf.Metric {
+	ret := []telegraf.Metric{}
+
+	for _, metric := range in {
+		if rp.Config.Filter.IsActive() {
+			// check if the filter should be applied to this metric
+			if ok := rp.Config.Filter.Apply(metric.Name(), metric.Fields(), metric.Tags()); !ok {
+				// this means filter should not be applied
+				ret = append(ret, metric)
+				continue
+			}
+		}
+		// This metric should pass through the filter, so call the filter Apply
+		// function and append results to the output slice.
+		ret = append(ret, rp.Processor.Apply(metric)...)
+	}
+
+	return ret
+}

internal/models/running_processor_test.go

@@ -0,0 +1,117 @@
+package models
+
+import (
+	"testing"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/testutil"
+
+	"github.com/stretchr/testify/assert"
+)
+
+type TestProcessor struct {
+}
+
+func (f *TestProcessor) SampleConfig() string { return "" }
+func (f *TestProcessor) Description() string  { return "" }
+
+// Apply renames:
+//   "foo" to "fuz"
+//   "bar" to "baz"
+// And it also drops measurements named "dropme"
+func (f *TestProcessor) Apply(in ...telegraf.Metric) []telegraf.Metric {
+	out := make([]telegraf.Metric, 0)
+	for _, m := range in {
+		switch m.Name() {
+		case "foo":
+			out = append(out, testutil.TestMetric(1, "fuz"))
+		case "bar":
+			out = append(out, testutil.TestMetric(1, "baz"))
+		case "dropme":
+			// drop the metric!
+		default:
+			out = append(out, m)
+		}
+	}
+	return out
+}
+
+func NewTestRunningProcessor() *RunningProcessor {
+	out := &RunningProcessor{
+		Name:      "test",
+		Processor: &TestProcessor{},
+		Config:    &ProcessorConfig{Filter: Filter{}},
+	}
+	return out
+}
+
+func TestRunningProcessor(t *testing.T) {
+	inmetrics := []telegraf.Metric{
+		testutil.TestMetric(1, "foo"),
+		testutil.TestMetric(1, "bar"),
+		testutil.TestMetric(1, "baz"),
+	}
+
+	expectedNames := []string{
+		"fuz",
+		"baz",
+		"baz",
+	}
+	rfp := NewTestRunningProcessor()
+	filteredMetrics := rfp.Apply(inmetrics...)
+
+	actualNames := []string{
+		filteredMetrics[0].Name(),
+		filteredMetrics[1].Name(),
+		filteredMetrics[2].Name(),
+	}
+	assert.Equal(t, expectedNames, actualNames)
+}
+
+func TestRunningProcessor_WithNameDrop(t *testing.T) {
+	inmetrics := []telegraf.Metric{
+		testutil.TestMetric(1, "foo"),
+		testutil.TestMetric(1, "bar"),
+		testutil.TestMetric(1, "baz"),
+	}
+
+	expectedNames := []string{
+		"foo",
+		"baz",
+		"baz",
+	}
+	rfp := NewTestRunningProcessor()
+
+	rfp.Config.Filter.NameDrop = []string{"foo"}
+	assert.NoError(t, rfp.Config.Filter.Compile())
+
+	filteredMetrics := rfp.Apply(inmetrics...)
+
+	actualNames := []string{
+		filteredMetrics[0].Name(),
+		filteredMetrics[1].Name(),
+		filteredMetrics[2].Name(),
+	}
+	assert.Equal(t, expectedNames, actualNames)
+}
+
+func TestRunningProcessor_DroppedMetric(t *testing.T) {
+	inmetrics := []telegraf.Metric{
+		testutil.TestMetric(1, "dropme"),
+		testutil.TestMetric(1, "foo"),
+		testutil.TestMetric(1, "bar"),
+	}
+
+	expectedNames := []string{
+		"fuz",
+		"baz",
+	}
+	rfp := NewTestRunningProcessor()
+	filteredMetrics := rfp.Apply(inmetrics...)
+
+	actualNames := []string{
+		filteredMetrics[0].Name(),
+		filteredMetrics[1].Name(),
+	}
+	assert.Equal(t, expectedNames, actualNames)
+}

logger/logger.go

@@ -0,0 +1,60 @@
+package logger
+
+import (
+	"io"
+	"log"
+	"os"
+	"time"
+
+	"github.com/influxdata/wlog"
+)
+
+// newTelegrafWriter returns a logging-wrapped writer.
+func newTelegrafWriter(w io.Writer) io.Writer {
+	return &telegrafLog{
+		writer: wlog.NewWriter(w),
+	}
+}
+
+type telegrafLog struct {
+	writer io.Writer
+}
+
+func (t *telegrafLog) Write(b []byte) (n int, err error) {
+	return t.writer.Write(append([]byte(time.Now().UTC().Format(time.RFC3339)+" "), b...))
+}
+
+// SetupLogging configures the logging output.
+//   debug   will set the log level to DEBUG
+//   quiet   will set the log level to ERROR
+//   logfile will direct the logging output to a file. Empty string is
+//           interpreted as stderr. If there is an error opening the file the
+//           logger will fallback to stderr.
+func SetupLogging(debug, quiet bool, logfile string) {
+	log.SetFlags(0)
+	if debug {
+		wlog.SetLevel(wlog.DEBUG)
+	}
+	if quiet {
+		wlog.SetLevel(wlog.ERROR)
+	}
+
+	var oFile *os.File
+	if logfile != "" {
+		if _, err := os.Stat(logfile); os.IsNotExist(err) {
+			if oFile, err = os.Create(logfile); err != nil {
+				log.Printf("E! Unable to create %s (%s), using stderr", logfile, err)
+				oFile = os.Stderr
+			}
+		} else {
+			if oFile, err = os.OpenFile(logfile, os.O_APPEND|os.O_WRONLY, os.ModeAppend); err != nil {
+				log.Printf("E! Unable to append to %s (%s), using stderr", logfile, err)
+				oFile = os.Stderr
+			}
+		}
+	} else {
+		oFile = os.Stderr
+	}
+
+	log.SetOutput(newTelegrafWriter(oFile))
+}

logger/logger_test.go

@@ -0,0 +1,62 @@
+package logger
+
+import (
+	"bytes"
+	"io/ioutil"
+	"log"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestWriteLogToFile(t *testing.T) {
+	tmpfile, err := ioutil.TempFile("", "")
+	assert.NoError(t, err)
+	defer func() { os.Remove(tmpfile.Name()) }()
+
+	SetupLogging(false, false, tmpfile.Name())
+	log.Printf("I! TEST")
+	log.Printf("D! TEST") // <- should be ignored
+
+	f, err := ioutil.ReadFile(tmpfile.Name())
+	assert.NoError(t, err)
+	assert.Equal(t, f[19:], []byte("Z I! TEST\n"))
+}
+
+func TestDebugWriteLogToFile(t *testing.T) {
+	tmpfile, err := ioutil.TempFile("", "")
+	assert.NoError(t, err)
+	defer func() { os.Remove(tmpfile.Name()) }()
+
+	SetupLogging(true, false, tmpfile.Name())
+	log.Printf("D! TEST")
+
+	f, err := ioutil.ReadFile(tmpfile.Name())
+	assert.NoError(t, err)
+	assert.Equal(t, f[19:], []byte("Z D! TEST\n"))
+}
+
+func TestErrorWriteLogToFile(t *testing.T) {
+	tmpfile, err := ioutil.TempFile("", "")
+	assert.NoError(t, err)
+	defer func() { os.Remove(tmpfile.Name()) }()
+
+	SetupLogging(false, true, tmpfile.Name())
+	log.Printf("E! TEST")
+	log.Printf("I! TEST") // <- should be ignored
+
+	f, err := ioutil.ReadFile(tmpfile.Name())
+	assert.NoError(t, err)
+	assert.Equal(t, f[19:], []byte("Z E! TEST\n"))
+}
+
+func BenchmarkTelegrafLogWrite(b *testing.B) {
+	var msg = []byte("test")
+	var buf bytes.Buffer
+	w := newTelegrafWriter(&buf)
+	for i := 0; i < b.N; i++ {
+		buf.Reset()
+		w.Write(msg)
+	}
+}

metric.go

@@ -0,0 +1,62 @@
+package telegraf
+
+import (
+	"time"
+
+	// TODO remove
+	"github.com/influxdata/influxdb/client/v2"
+)
+
+// ValueType is an enumeration of metric types that represent a simple value.
+type ValueType int
+
+// Possible values for the ValueType enum.
+const (
+	_ ValueType = iota
+	Counter
+	Gauge
+	Untyped
+)
+
+type Metric interface {
+	Serialize() []byte
+	String() string // convenience function for string(Serialize())
+	Copy() Metric
+	// Split will attempt to return multiple metrics with the same timestamp
+	// whose string representations are no longer than maxSize.
+	// Metrics with a single field may exceed the requested size.
+	Split(maxSize int) []Metric
+
+	// Tag functions
+	HasTag(key string) bool
+	AddTag(key, value string)
+	RemoveTag(key string)
+
+	// Field functions
+	HasField(key string) bool
+	AddField(key string, value interface{})
+	RemoveField(key string) error
+
+	// Name functions
+	SetName(name string)
+	SetPrefix(prefix string)
+	SetSuffix(suffix string)
+
+	// Getting data structure functions
+	Name() string
+	Tags() map[string]string
+	Fields() map[string]interface{}
+	Time() time.Time
+	UnixNano() int64
+	Type() ValueType
+	Len() int // returns the length of the serialized metric, including newline
+	HashID() uint64
+
+	// aggregator things:
+	SetAggregate(bool)
+	IsAggregate() bool
+
+	// Point returns a influxdb client.Point object
+	// TODO remove this function
+	Point() *client.Point
+}

metric/escape.go

@@ -0,0 +1,49 @@
+package metric
+
+import (
+	"strings"
+)
+
+var (
+	// escaper is for escaping:
+	//   - tag keys
+	//   - tag values
+	//   - field keys
+	// see https://docs.influxdata.com/influxdb/v1.0/write_protocols/line_protocol_tutorial/#special-characters-and-keywords
+	escaper   = strings.NewReplacer(`,`, `\,`, `"`, `\"`, ` `, `\ `, `=`, `\=`)
+	unEscaper = strings.NewReplacer(`\,`, `,`, `\"`, `"`, `\ `, ` `, `\=`, `=`)
+
+	// nameEscaper is for escaping measurement names only.
+	// see https://docs.influxdata.com/influxdb/v1.0/write_protocols/line_protocol_tutorial/#special-characters-and-keywords
+	nameEscaper   = strings.NewReplacer(`,`, `\,`, ` `, `\ `)
+	nameUnEscaper = strings.NewReplacer(`\,`, `,`, `\ `, ` `)
+
+	// stringFieldEscaper is for escaping string field values only.
+	// see https://docs.influxdata.com/influxdb/v1.0/write_protocols/line_protocol_tutorial/#special-characters-and-keywords
+	stringFieldEscaper   = strings.NewReplacer(`"`, `\"`)
+	stringFieldUnEscaper = strings.NewReplacer(`\"`, `"`)
+)
+
+func escape(s string, t string) string {
+	switch t {
+	case "fieldkey", "tagkey", "tagval":
+		return escaper.Replace(s)
+	case "name":
+		return nameEscaper.Replace(s)
+	case "fieldval":
+		return stringFieldEscaper.Replace(s)
+	}
+	return s
+}
+
+func unescape(s string, t string) string {
+	switch t {
+	case "fieldkey", "tagkey", "tagval":
+		return unEscaper.Replace(s)
+	case "name":
+		return nameUnEscaper.Replace(s)
+	case "fieldval":
+		return stringFieldUnEscaper.Replace(s)
+	}
+	return s
+}

metric/inline_strconv_parse.go

@@ -0,0 +1,38 @@
+package metric
+
+import (
+	"reflect"
+	"strconv"
+	"unsafe"
+)
+
+// parseIntBytes is a zero-alloc wrapper around strconv.ParseInt.
+func parseIntBytes(b []byte, base int, bitSize int) (i int64, err error) {
+	s := unsafeBytesToString(b)
+	return strconv.ParseInt(s, base, bitSize)
+}
+
+// parseFloatBytes is a zero-alloc wrapper around strconv.ParseFloat.
+func parseFloatBytes(b []byte, bitSize int) (float64, error) {
+	s := unsafeBytesToString(b)
+	return strconv.ParseFloat(s, bitSize)
+}
+
+// parseBoolBytes is a zero-alloc wrapper around strconv.ParseBool.
+func parseBoolBytes(b []byte) (bool, error) {
+	return strconv.ParseBool(unsafeBytesToString(b))
+}
+
+// unsafeBytesToString converts a []byte to a string without a heap allocation.
+//
+// It is unsafe, and is intended to prepare input to short-lived functions
+// that require strings.
+func unsafeBytesToString(in []byte) string {
+	src := *(*reflect.SliceHeader)(unsafe.Pointer(&in))
+	dst := reflect.StringHeader{
+		Data: src.Data,
+		Len:  src.Len,
+	}
+	s := *(*string)(unsafe.Pointer(&dst))
+	return s
+}

metric/inline_strconv_parse_test.go

@@ -0,0 +1,103 @@
+package metric
+
+import (
+	"strconv"
+	"testing"
+	"testing/quick"
+)
+
+func TestParseIntBytesEquivalenceFuzz(t *testing.T) {
+	f := func(b []byte, base int, bitSize int) bool {
+		exp, expErr := strconv.ParseInt(string(b), base, bitSize)
+		got, gotErr := parseIntBytes(b, base, bitSize)
+
+		return exp == got && checkErrs(expErr, gotErr)
+	}
+
+	cfg := &quick.Config{
+		MaxCount: 10000,
+	}
+
+	if err := quick.Check(f, cfg); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestParseIntBytesValid64bitBase10EquivalenceFuzz(t *testing.T) {
+	buf := []byte{}
+	f := func(n int64) bool {
+		buf = strconv.AppendInt(buf[:0], n, 10)
+
+		exp, expErr := strconv.ParseInt(string(buf), 10, 64)
+		got, gotErr := parseIntBytes(buf, 10, 64)
+
+		return exp == got && checkErrs(expErr, gotErr)
+	}
+
+	cfg := &quick.Config{
+		MaxCount: 10000,
+	}
+
+	if err := quick.Check(f, cfg); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestParseFloatBytesEquivalenceFuzz(t *testing.T) {
+	f := func(b []byte, bitSize int) bool {
+		exp, expErr := strconv.ParseFloat(string(b), bitSize)
+		got, gotErr := parseFloatBytes(b, bitSize)
+
+		return exp == got && checkErrs(expErr, gotErr)
+	}
+
+	cfg := &quick.Config{
+		MaxCount: 10000,
+	}
+
+	if err := quick.Check(f, cfg); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestParseFloatBytesValid64bitEquivalenceFuzz(t *testing.T) {
+	buf := []byte{}
+	f := func(n float64) bool {
+		buf = strconv.AppendFloat(buf[:0], n, 'f', -1, 64)
+
+		exp, expErr := strconv.ParseFloat(string(buf), 64)
+		got, gotErr := parseFloatBytes(buf, 64)
+
+		return exp == got && checkErrs(expErr, gotErr)
+	}
+
+	cfg := &quick.Config{
+		MaxCount: 10000,
+	}
+
+	if err := quick.Check(f, cfg); err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestParseBoolBytesEquivalence(t *testing.T) {
+	var buf []byte
+	for _, s := range []string{"1", "t", "T", "TRUE", "true", "True", "0", "f", "F", "FALSE", "false", "False", "fail", "TrUe", "FAlSE", "numbers", ""} {
+		buf = append(buf[:0], s...)
+
+		exp, expErr := strconv.ParseBool(s)
+		got, gotErr := parseBoolBytes(buf)
+
+		if got != exp || !checkErrs(expErr, gotErr) {
+			t.Errorf("Failed to parse boolean value %q correctly: wanted (%t, %v), got (%t, %v)", s, exp, expErr, got, gotErr)
+		}
+	}
+}
+
+func checkErrs(a, b error) bool {
+	if (a == nil) != (b == nil) {
+		return false
+	}
+
+	return a == nil || a.Error() == b.Error()
+}

metric/metric.go

@@ -0,0 +1,546 @@
+package metric
+
+import (
+	"bytes"
+	"fmt"
+	"hash/fnv"
+	"sort"
+	"strconv"
+	"time"
+
+	"github.com/influxdata/telegraf"
+
+	// TODO remove
+	"github.com/influxdata/influxdb/client/v2"
+)
+
+const MaxInt = int(^uint(0) >> 1)
+
+func New(
+	name string,
+	tags map[string]string,
+	fields map[string]interface{},
+	t time.Time,
+	mType ...telegraf.ValueType,
+) (telegraf.Metric, error) {
+	if len(fields) == 0 {
+		return nil, fmt.Errorf("Metric cannot be made without any fields")
+	}
+	if len(name) == 0 {
+		return nil, fmt.Errorf("Metric cannot be made with an empty name")
+	}
+
+	var thisType telegraf.ValueType
+	if len(mType) > 0 {
+		thisType = mType[0]
+	} else {
+		thisType = telegraf.Untyped
+	}
+
+	m := &metric{
+		name:  []byte(escape(name, "name")),
+		t:     []byte(fmt.Sprint(t.UnixNano())),
+		nsec:  t.UnixNano(),
+		mType: thisType,
+	}
+
+	// pre-allocate exact size of the tags slice
+	taglen := 0
+	for k, v := range tags {
+		// TODO check that length of tag key & value are > 0
+		taglen += 2 + len(escape(k, "tagkey")) + len(escape(v, "tagval"))
+	}
+	m.tags = make([]byte, taglen)
+
+	i := 0
+	for k, v := range tags {
+		m.tags[i] = ','
+		i++
+		i += copy(m.tags[i:], escape(k, "tagkey"))
+		m.tags[i] = '='
+		i++
+		i += copy(m.tags[i:], escape(v, "tagval"))
+	}
+
+	// pre-allocate capacity of the fields slice
+	fieldlen := 0
+	for k, _ := range fields {
+		// 10 bytes is completely arbitrary, but will at least prevent some
+		// amount of allocations. There's a small possibility this will create
+		// slightly more allocations for a metric that has many short fields.
+		fieldlen += len(k) + 10
+	}
+	m.fields = make([]byte, 0, fieldlen)
+
+	i = 0
+	for k, v := range fields {
+		if i != 0 {
+			m.fields = append(m.fields, ',')
+		}
+		m.fields = appendField(m.fields, k, v)
+		i++
+	}
+
+	return m, nil
+}
+
+// indexUnescapedByte finds the index of the first byte equal to b in buf that
+// is not escaped. Returns -1 if not found.
+func indexUnescapedByte(buf []byte, b byte) int {
+	var keyi int
+	for {
+		i := bytes.IndexByte(buf[keyi:], b)
+		if i == -1 {
+			return -1
+		} else if i == 0 {
+			break
+		}
+		keyi += i
+		if countBackslashes(buf, keyi-1)%2 == 0 {
+			break
+		} else {
+			keyi++
+		}
+	}
+	return keyi
+}
+
+// countBackslashes counts the number of preceding backslashes starting at
+// the 'start' index.
+func countBackslashes(buf []byte, index int) int {
+	var count int
+	for {
+		if index < 0 {
+			return count
+		}
+		if buf[index] == '\\' {
+			count++
+			index--
+		} else {
+			break
+		}
+	}
+	return count
+}
+
+type metric struct {
+	name   []byte
+	tags   []byte
+	fields []byte
+	t      []byte
+
+	mType     telegraf.ValueType
+	aggregate bool
+
+	// cached values for reuse in "get" functions
+	hashID uint64
+	nsec   int64
+}
+
+func (m *metric) Point() *client.Point {
+	c, _ := client.NewPoint(m.Name(), m.Tags(), m.Fields(), m.Time())
+	return c
+}
+
+func (m *metric) String() string {
+	return string(m.name) + string(m.tags) + " " + string(m.fields) + " " + string(m.t) + "\n"
+}
+
+func (m *metric) SetAggregate(b bool) {
+	m.aggregate = b
+}
+
+func (m *metric) IsAggregate() bool {
+	return m.aggregate
+}
+
+func (m *metric) Type() telegraf.ValueType {
+	return m.mType
+}
+
+func (m *metric) Len() int {
+	// 3 is for 2 spaces surrounding the fields array + newline at the end.
+	return len(m.name) + len(m.tags) + len(m.fields) + len(m.t) + 3
+}
+
+func (m *metric) Serialize() []byte {
+	tmp := make([]byte, m.Len())
+	i := 0
+	i += copy(tmp[i:], m.name)
+	i += copy(tmp[i:], m.tags)
+	tmp[i] = ' '
+	i++
+	i += copy(tmp[i:], m.fields)
+	tmp[i] = ' '
+	i++
+	i += copy(tmp[i:], m.t)
+	tmp[i] = '\n'
+	return tmp
+}
+
+func (m *metric) Split(maxSize int) []telegraf.Metric {
+	if m.Len() < maxSize {
+		return []telegraf.Metric{m}
+	}
+	var out []telegraf.Metric
+
+	// constant number of bytes for each metric (in addition to field bytes)
+	constant := len(m.name) + len(m.tags) + len(m.t) + 3
+	// currently selected fields
+	fields := make([]byte, 0, maxSize)
+
+	i := 0
+	for {
+		if i >= len(m.fields) {
+			// hit the end of the field byte slice
+			if len(fields) > 0 {
+				out = append(out, copyWith(m.name, m.tags, fields, m.t))
+			}
+			break
+		}
+
+		// find the end of the next field
+		j := indexUnescapedByte(m.fields[i:], ',')
+		if j == -1 {
+			j = len(m.fields)
+		} else {
+			j += i
+		}
+
+		// if true, then we need to create a metric _not_ including the currently
+		// selected field
+		if len(m.fields[i:j])+len(fields)+constant > maxSize {
+			// if false, then we'll create a metric including the currently
+			// selected field anyways. This means that the given maxSize is too
+			// small for a single field to fit.
+			if len(fields) > 0 {
+				out = append(out, copyWith(m.name, m.tags, fields, m.t))
+			}
+
+			fields = make([]byte, 0, maxSize)
+		}
+		if len(fields) > 0 {
+			fields = append(fields, ',')
+		}
+		fields = append(fields, m.fields[i:j]...)
+
+		i = j + 1
+	}
+	return out
+}
+
+func (m *metric) Fields() map[string]interface{} {
+	fieldMap := map[string]interface{}{}
+	i := 0
+	for {
+		if i >= len(m.fields) {
+			break
+		}
+		// end index of field key
+		i1 := indexUnescapedByte(m.fields[i:], '=')
+		if i1 == -1 {
+			break
+		}
+		// start index of field value
+		i2 := i1 + 1
+
+		// end index of field value
+		var i3 int
+		if m.fields[i:][i2] == '"' {
+			i3 = indexUnescapedByte(m.fields[i:][i2+1:], '"')
+			if i3 == -1 {
+				i3 = len(m.fields[i:])
+			}
+			i3 += i2 + 2 // increment index to the comma
+		} else {
+			i3 = indexUnescapedByte(m.fields[i:], ',')
+			if i3 == -1 {
+				i3 = len(m.fields[i:])
+			}
+		}
+
+		switch m.fields[i:][i2] {
+		case '"':
+			// string field
+			fieldMap[unescape(string(m.fields[i:][0:i1]), "fieldkey")] = unescape(string(m.fields[i:][i2+1:i3-1]), "fieldval")
+		case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
+			// number field
+			switch m.fields[i:][i3-1] {
+			case 'i':
+				// integer field
+				n, err := parseIntBytes(m.fields[i:][i2:i3-1], 10, 64)
+				if err == nil {
+					fieldMap[unescape(string(m.fields[i:][0:i1]), "fieldkey")] = n
+				} else {
+					// TODO handle error or just ignore field silently?
+				}
+			default:
+				// float field
+				n, err := parseFloatBytes(m.fields[i:][i2:i3], 64)
+				if err == nil {
+					fieldMap[unescape(string(m.fields[i:][0:i1]), "fieldkey")] = n
+				} else {
+					// TODO handle error or just ignore field silently?
+				}
+			}
+		case 'T', 't':
+			fieldMap[unescape(string(m.fields[i:][0:i1]), "fieldkey")] = true
+		case 'F', 'f':
+			fieldMap[unescape(string(m.fields[i:][0:i1]), "fieldkey")] = false
+		default:
+			// TODO handle unsupported field type
+		}
+
+		i += i3 + 1
+	}
+
+	return fieldMap
+}
+
+func (m *metric) Tags() map[string]string {
+	tagMap := map[string]string{}
+	if len(m.tags) == 0 {
+		return tagMap
+	}
+
+	i := 0
+	for {
+		// start index of tag key
+		i0 := indexUnescapedByte(m.tags[i:], ',') + 1
+		if i0 == 0 {
+			// didn't find a tag start
+			break
+		}
+		// end index of tag key
+		i1 := indexUnescapedByte(m.tags[i:], '=')
+		// start index of tag value
+		i2 := i1 + 1
+		// end index of tag value (starting from i2)
+		i3 := indexUnescapedByte(m.tags[i+i2:], ',')
+		if i3 == -1 {
+			tagMap[unescape(string(m.tags[i:][i0:i1]), "tagkey")] = unescape(string(m.tags[i:][i2:]), "tagval")
+			break
+		}
+		tagMap[unescape(string(m.tags[i:][i0:i1]), "tagkey")] = unescape(string(m.tags[i:][i2:i2+i3]), "tagval")
+		// increment start index for the next tag
+		i += i2 + i3
+	}
+
+	return tagMap
+}
+
+func (m *metric) Name() string {
+	return unescape(string(m.name), "name")
+}
+
+func (m *metric) Time() time.Time {
+	// assume metric has been verified already and ignore error:
+	if m.nsec == 0 {
+		m.nsec, _ = parseIntBytes(m.t, 10, 64)
+	}
+	return time.Unix(0, m.nsec)
+}
+
+func (m *metric) UnixNano() int64 {
+	// assume metric has been verified already and ignore error:
+	if m.nsec == 0 {
+		m.nsec, _ = parseIntBytes(m.t, 10, 64)
+	}
+	return m.nsec
+}
+
+func (m *metric) SetName(name string) {
+	m.hashID = 0
+	m.name = []byte(nameEscaper.Replace(name))
+}
+
+func (m *metric) SetPrefix(prefix string) {
+	m.hashID = 0
+	m.name = append([]byte(nameEscaper.Replace(prefix)), m.name...)
+}
+
+func (m *metric) SetSuffix(suffix string) {
+	m.hashID = 0
+	m.name = append(m.name, []byte(nameEscaper.Replace(suffix))...)
+}
+
+func (m *metric) AddTag(key, value string) {
+	m.RemoveTag(key)
+	m.tags = append(m.tags, []byte(","+escape(key, "tagkey")+"="+escape(value, "tagval"))...)
+}
+
+func (m *metric) HasTag(key string) bool {
+	i := bytes.Index(m.tags, []byte(escape(key, "tagkey")+"="))
+	if i == -1 {
+		return false
+	}
+	return true
+}
+
+func (m *metric) RemoveTag(key string) {
+	m.hashID = 0
+
+	i := bytes.Index(m.tags, []byte(escape(key, "tagkey")+"="))
+	if i == -1 {
+		return
+	}
+
+	tmp := m.tags[0 : i-1]
+	j := indexUnescapedByte(m.tags[i:], ',')
+	if j != -1 {
+		tmp = append(tmp, m.tags[i+j:]...)
+	}
+	m.tags = tmp
+	return
+}
+
+func (m *metric) AddField(key string, value interface{}) {
+	m.fields = append(m.fields, ',')
+	m.fields = appendField(m.fields, key, value)
+}
+
+func (m *metric) HasField(key string) bool {
+	i := bytes.Index(m.fields, []byte(escape(key, "tagkey")+"="))
+	if i == -1 {
+		return false
+	}
+	return true
+}
+
+func (m *metric) RemoveField(key string) error {
+	i := bytes.Index(m.fields, []byte(escape(key, "tagkey")+"="))
+	if i == -1 {
+		return nil
+	}
+
+	var tmp []byte
+	if i != 0 {
+		tmp = m.fields[0 : i-1]
+	}
+	j := indexUnescapedByte(m.fields[i:], ',')
+	if j != -1 {
+		tmp = append(tmp, m.fields[i+j:]...)
+	}
+
+	if len(tmp) == 0 {
+		return fmt.Errorf("Metric cannot remove final field: %s", m.fields)
+	}
+
+	m.fields = tmp
+	return nil
+}
+
+func (m *metric) Copy() telegraf.Metric {
+	return copyWith(m.name, m.tags, m.fields, m.t)
+}
+
+func copyWith(name, tags, fields, t []byte) telegraf.Metric {
+	out := metric{
+		name:   make([]byte, len(name)),
+		tags:   make([]byte, len(tags)),
+		fields: make([]byte, len(fields)),
+		t:      make([]byte, len(t)),
+	}
+	copy(out.name, name)
+	copy(out.tags, tags)
+	copy(out.fields, fields)
+	copy(out.t, t)
+	return &out
+}
+
+func (m *metric) HashID() uint64 {
+	if m.hashID == 0 {
+		h := fnv.New64a()
+		h.Write(m.name)
+
+		tags := m.Tags()
+		tmp := make([]string, len(tags))
+		i := 0
+		for k, v := range tags {
+			tmp[i] = k + v
+			i++
+		}
+		sort.Strings(tmp)
+
+		for _, s := range tmp {
+			h.Write([]byte(s))
+		}
+
+		m.hashID = h.Sum64()
+	}
+	return m.hashID
+}
+
+func appendField(b []byte, k string, v interface{}) []byte {
+	if v == nil {
+		return b
+	}
+	b = append(b, []byte(escape(k, "tagkey")+"=")...)
+
+	// check popular types first
+	switch v := v.(type) {
+	case float64:
+		b = strconv.AppendFloat(b, v, 'f', -1, 64)
+	case int64:
+		b = strconv.AppendInt(b, v, 10)
+		b = append(b, 'i')
+	case string:
+		b = append(b, '"')
+		b = append(b, []byte(escape(v, "fieldval"))...)
+		b = append(b, '"')
+	case bool:
+		b = strconv.AppendBool(b, v)
+	case int32:
+		b = strconv.AppendInt(b, int64(v), 10)
+		b = append(b, 'i')
+	case int16:
+		b = strconv.AppendInt(b, int64(v), 10)
+		b = append(b, 'i')
+	case int8:
+		b = strconv.AppendInt(b, int64(v), 10)
+		b = append(b, 'i')
+	case int:
+		b = strconv.AppendInt(b, int64(v), 10)
+		b = append(b, 'i')
+	case uint64:
+		// Cap uints above the maximum int value
+		var intv int64
+		if v <= uint64(MaxInt) {
+			intv = int64(v)
+		} else {
+			intv = int64(MaxInt)
+		}
+		b = strconv.AppendInt(b, intv, 10)
+		b = append(b, 'i')
+	case uint32:
+		b = strconv.AppendInt(b, int64(v), 10)
+		b = append(b, 'i')
+	case uint16:
+		b = strconv.AppendInt(b, int64(v), 10)
+		b = append(b, 'i')
+	case uint8:
+		b = strconv.AppendInt(b, int64(v), 10)
+		b = append(b, 'i')
+	case uint:
+		// Cap uints above the maximum int value
+		var intv int64
+		if v <= uint(MaxInt) {
+			intv = int64(v)
+		} else {
+			intv = int64(MaxInt)
+		}
+		b = strconv.AppendInt(b, intv, 10)
+		b = append(b, 'i')
+	case float32:
+		b = strconv.AppendFloat(b, float64(v), 'f', -1, 32)
+	case []byte:
+		b = append(b, v...)
+	default:
+		// Can't determine the type, so convert to string
+		b = append(b, '"')
+		b = append(b, []byte(escape(fmt.Sprintf("%v", v), "fieldval"))...)
+		b = append(b, '"')
+	}
+
+	return b
+}

metric/metric_benchmark_test.go

@@ -0,0 +1,148 @@
+package metric
+
+import (
+	"fmt"
+	"testing"
+	"time"
+
+	"github.com/influxdata/telegraf"
+)
+
+// vars for making sure that the compiler doesnt optimize out the benchmarks:
+var (
+	s      string
+	I      interface{}
+	tags   map[string]string
+	fields map[string]interface{}
+)
+
+func BenchmarkNewMetric(b *testing.B) {
+	var mt telegraf.Metric
+	for n := 0; n < b.N; n++ {
+		mt, _ = New("test_metric",
+			map[string]string{
+				"test_tag_1": "tag_value_1",
+				"test_tag_2": "tag_value_2",
+				"test_tag_3": "tag_value_3",
+			},
+			map[string]interface{}{
+				"string_field": "string",
+				"int_field":    int64(1000),
+				"float_field":  float64(2.1),
+			},
+			time.Now(),
+		)
+	}
+	s = string(mt.String())
+}
+
+func BenchmarkAddTag(b *testing.B) {
+	var mt telegraf.Metric
+	mt = &metric{
+		name:   []byte("cpu"),
+		tags:   []byte(",host=localhost"),
+		fields: []byte("a=101"),
+		t:      []byte("1480614053000000000"),
+	}
+	for n := 0; n < b.N; n++ {
+		mt.AddTag("foo", "bar")
+	}
+	s = string(mt.String())
+}
+
+func BenchmarkSplit(b *testing.B) {
+	var mt telegraf.Metric
+	mt = &metric{
+		name:   []byte("cpu"),
+		tags:   []byte(",host=localhost"),
+		fields: []byte("a=101,b=10i,c=10101,d=101010,e=42"),
+		t:      []byte("1480614053000000000"),
+	}
+	var metrics []telegraf.Metric
+	for n := 0; n < b.N; n++ {
+		metrics = mt.Split(60)
+	}
+	s = string(metrics[0].String())
+}
+
+func BenchmarkTags(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		var mt, _ = New("test_metric",
+			map[string]string{
+				"test_tag_1": "tag_value_1",
+				"test_tag_2": "tag_value_2",
+				"test_tag_3": "tag_value_3",
+			},
+			map[string]interface{}{
+				"string_field": "string",
+				"int_field":    int64(1000),
+				"float_field":  float64(2.1),
+			},
+			time.Now(),
+		)
+		tags = mt.Tags()
+	}
+	s = fmt.Sprint(tags)
+}
+
+func BenchmarkFields(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		var mt, _ = New("test_metric",
+			map[string]string{
+				"test_tag_1": "tag_value_1",
+				"test_tag_2": "tag_value_2",
+				"test_tag_3": "tag_value_3",
+			},
+			map[string]interface{}{
+				"string_field": "string",
+				"int_field":    int64(1000),
+				"float_field":  float64(2.1),
+			},
+			time.Now(),
+		)
+		fields = mt.Fields()
+	}
+	s = fmt.Sprint(fields)
+}
+
+func BenchmarkString(b *testing.B) {
+	mt, _ := New("test_metric",
+		map[string]string{
+			"test_tag_1": "tag_value_1",
+			"test_tag_2": "tag_value_2",
+			"test_tag_3": "tag_value_3",
+		},
+		map[string]interface{}{
+			"string_field": "string",
+			"int_field":    int64(1000),
+			"float_field":  float64(2.1),
+		},
+		time.Now(),
+	)
+	var S string
+	for n := 0; n < b.N; n++ {
+		S = mt.String()
+	}
+	s = S
+}
+
+func BenchmarkSerialize(b *testing.B) {
+	mt, _ := New("test_metric",
+		map[string]string{
+			"test_tag_1": "tag_value_1",
+			"test_tag_2": "tag_value_2",
+			"test_tag_3": "tag_value_3",
+		},
+		map[string]interface{}{
+			"string_field": "string",
+			"int_field":    int64(1000),
+			"float_field":  float64(2.1),
+		},
+		time.Now(),
+	)
+	var B []byte
+	for n := 0; n < b.N; n++ {
+		B = mt.Serialize()
+	}
+	s = string(B)
+}

metric/metric_test.go

@@ -0,0 +1,646 @@
+package metric
+
+import (
+	"fmt"
+	"math"
+	"regexp"
+	"testing"
+	"time"
+
+	"github.com/influxdata/telegraf"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNewMetric(t *testing.T) {
+	now := time.Now()
+
+	tags := map[string]string{
+		"host":       "localhost",
+		"datacenter": "us-east-1",
+	}
+	fields := map[string]interface{}{
+		"usage_idle": float64(99),
+		"usage_busy": float64(1),
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+
+	assert.Equal(t, telegraf.Untyped, m.Type())
+	assert.Equal(t, tags, m.Tags())
+	assert.Equal(t, fields, m.Fields())
+	assert.Equal(t, "cpu", m.Name())
+	assert.Equal(t, now, m.Time())
+	assert.Equal(t, now.UnixNano(), m.UnixNano())
+}
+
+func TestNewErrors(t *testing.T) {
+	// creating a metric with an empty name produces an error:
+	m, err := New(
+		"",
+		map[string]string{
+			"datacenter": "us-east-1",
+			"mytag":      "foo",
+			"another":    "tag",
+		},
+		map[string]interface{}{
+			"value": float64(1),
+		},
+		time.Now(),
+	)
+	assert.Error(t, err)
+	assert.Nil(t, m)
+
+	// creating a metric with empty fields produces an error:
+	m, err = New(
+		"foobar",
+		map[string]string{
+			"datacenter": "us-east-1",
+			"mytag":      "foo",
+			"another":    "tag",
+		},
+		map[string]interface{}{},
+		time.Now(),
+	)
+	assert.Error(t, err)
+	assert.Nil(t, m)
+}
+
+func TestNewMetric_Tags(t *testing.T) {
+	now := time.Now()
+	tags := map[string]string{
+		"host":       "localhost",
+		"datacenter": "us-east-1",
+	}
+	fields := map[string]interface{}{
+		"value": float64(1),
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+
+	assert.True(t, m.HasTag("host"))
+	assert.True(t, m.HasTag("datacenter"))
+
+	m.AddTag("newtag", "foo")
+	assert.True(t, m.HasTag("newtag"))
+
+	m.RemoveTag("host")
+	assert.False(t, m.HasTag("host"))
+	assert.True(t, m.HasTag("newtag"))
+	assert.True(t, m.HasTag("datacenter"))
+
+	m.RemoveTag("datacenter")
+	assert.False(t, m.HasTag("datacenter"))
+	assert.True(t, m.HasTag("newtag"))
+	assert.Equal(t, map[string]string{"newtag": "foo"}, m.Tags())
+
+	m.RemoveTag("newtag")
+	assert.False(t, m.HasTag("newtag"))
+	assert.Equal(t, map[string]string{}, m.Tags())
+
+	assert.Equal(t, "cpu value=1 "+fmt.Sprint(now.UnixNano())+"\n", m.String())
+}
+
+func TestSerialize(t *testing.T) {
+	now := time.Now()
+	tags := map[string]string{
+		"datacenter": "us-east-1",
+	}
+	fields := map[string]interface{}{
+		"value": float64(1),
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+
+	assert.Equal(t,
+		[]byte("cpu,datacenter=us-east-1 value=1 "+fmt.Sprint(now.UnixNano())+"\n"),
+		m.Serialize())
+
+	m.RemoveTag("datacenter")
+	assert.Equal(t,
+		[]byte("cpu value=1 "+fmt.Sprint(now.UnixNano())+"\n"),
+		m.Serialize())
+}
+
+func TestHashID(t *testing.T) {
+	m, _ := New(
+		"cpu",
+		map[string]string{
+			"datacenter": "us-east-1",
+			"mytag":      "foo",
+			"another":    "tag",
+		},
+		map[string]interface{}{
+			"value": float64(1),
+		},
+		time.Now(),
+	)
+	hash := m.HashID()
+
+	// adding a field doesn't change the hash:
+	m.AddField("foo", int64(100))
+	assert.Equal(t, hash, m.HashID())
+
+	// removing a non-existent tag doesn't change the hash:
+	m.RemoveTag("no-op")
+	assert.Equal(t, hash, m.HashID())
+
+	// adding a tag does change it:
+	m.AddTag("foo", "bar")
+	assert.NotEqual(t, hash, m.HashID())
+	hash = m.HashID()
+
+	// removing a tag also changes it:
+	m.RemoveTag("mytag")
+	assert.NotEqual(t, hash, m.HashID())
+}
+
+func TestHashID_Consistency(t *testing.T) {
+	m, _ := New(
+		"cpu",
+		map[string]string{
+			"datacenter": "us-east-1",
+			"mytag":      "foo",
+			"another":    "tag",
+		},
+		map[string]interface{}{
+			"value": float64(1),
+		},
+		time.Now(),
+	)
+	hash := m.HashID()
+
+	for i := 0; i < 1000; i++ {
+		m2, _ := New(
+			"cpu",
+			map[string]string{
+				"datacenter": "us-east-1",
+				"mytag":      "foo",
+				"another":    "tag",
+			},
+			map[string]interface{}{
+				"value": float64(1),
+			},
+			time.Now(),
+		)
+		assert.Equal(t, hash, m2.HashID())
+	}
+}
+
+func TestNewMetric_NameModifiers(t *testing.T) {
+	now := time.Now()
+	tags := map[string]string{}
+	fields := map[string]interface{}{
+		"value": float64(1),
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+
+	hash := m.HashID()
+	suffix := fmt.Sprintf(" value=1 %d\n", now.UnixNano())
+	assert.Equal(t, "cpu"+suffix, m.String())
+
+	m.SetPrefix("pre_")
+	assert.NotEqual(t, hash, m.HashID())
+	hash = m.HashID()
+	assert.Equal(t, "pre_cpu"+suffix, m.String())
+
+	m.SetSuffix("_post")
+	assert.NotEqual(t, hash, m.HashID())
+	hash = m.HashID()
+	assert.Equal(t, "pre_cpu_post"+suffix, m.String())
+
+	m.SetName("mem")
+	assert.NotEqual(t, hash, m.HashID())
+	assert.Equal(t, "mem"+suffix, m.String())
+}
+
+func TestNewMetric_FieldModifiers(t *testing.T) {
+	now := time.Now()
+	tags := map[string]string{
+		"host": "localhost",
+	}
+	fields := map[string]interface{}{
+		"value": float64(1),
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+
+	assert.True(t, m.HasField("value"))
+	assert.False(t, m.HasField("foo"))
+
+	m.AddField("newfield", "foo")
+	assert.True(t, m.HasField("newfield"))
+
+	assert.NoError(t, m.RemoveField("newfield"))
+	assert.False(t, m.HasField("newfield"))
+
+	// don't allow user to remove all fields:
+	assert.Error(t, m.RemoveField("value"))
+
+	m.AddField("value2", int64(101))
+	assert.NoError(t, m.RemoveField("value"))
+	assert.False(t, m.HasField("value"))
+}
+
+func TestNewMetric_Fields(t *testing.T) {
+	now := time.Now()
+	tags := map[string]string{
+		"host": "localhost",
+	}
+	fields := map[string]interface{}{
+		"float":  float64(1),
+		"int":    int64(1),
+		"bool":   true,
+		"false":  false,
+		"string": "test",
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+
+	assert.Equal(t, fields, m.Fields())
+}
+
+func TestNewMetric_Time(t *testing.T) {
+	now := time.Now()
+	tags := map[string]string{
+		"host": "localhost",
+	}
+	fields := map[string]interface{}{
+		"float":  float64(1),
+		"int":    int64(1),
+		"bool":   true,
+		"false":  false,
+		"string": "test",
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+	m = m.Copy()
+	m2 := m.Copy()
+
+	assert.Equal(t, now.UnixNano(), m.Time().UnixNano())
+	assert.Equal(t, now.UnixNano(), m2.UnixNano())
+}
+
+func TestNewMetric_Copy(t *testing.T) {
+	now := time.Now()
+	tags := map[string]string{}
+	fields := map[string]interface{}{
+		"float": float64(1),
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+	m2 := m.Copy()
+
+	assert.Equal(t,
+		fmt.Sprintf("cpu float=1 %d\n", now.UnixNano()),
+		m.String())
+	m.AddTag("host", "localhost")
+	assert.Equal(t,
+		fmt.Sprintf("cpu,host=localhost float=1 %d\n", now.UnixNano()),
+		m.String())
+
+	assert.Equal(t,
+		fmt.Sprintf("cpu float=1 %d\n", now.UnixNano()),
+		m2.String())
+}
+
+func TestNewMetric_AllTypes(t *testing.T) {
+	now := time.Now()
+	tags := map[string]string{}
+	fields := map[string]interface{}{
+		"float64":     float64(1),
+		"float32":     float32(1),
+		"int64":       int64(1),
+		"int32":       int32(1),
+		"int16":       int16(1),
+		"int8":        int8(1),
+		"int":         int(1),
+		"uint64":      uint64(1),
+		"uint32":      uint32(1),
+		"uint16":      uint16(1),
+		"uint8":       uint8(1),
+		"uint":        uint(1),
+		"bytes":       []byte("foo"),
+		"nil":         nil,
+		"maxuint64":   uint64(MaxInt) + 10,
+		"maxuint":     uint(MaxInt) + 10,
+		"unsupported": []int{1, 2},
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+
+	assert.Contains(t, m.String(), "float64=1")
+	assert.Contains(t, m.String(), "float32=1")
+	assert.Contains(t, m.String(), "int64=1i")
+	assert.Contains(t, m.String(), "int32=1i")
+	assert.Contains(t, m.String(), "int16=1i")
+	assert.Contains(t, m.String(), "int8=1i")
+	assert.Contains(t, m.String(), "int=1i")
+	assert.Contains(t, m.String(), "uint64=1i")
+	assert.Contains(t, m.String(), "uint32=1i")
+	assert.Contains(t, m.String(), "uint16=1i")
+	assert.Contains(t, m.String(), "uint8=1i")
+	assert.Contains(t, m.String(), "uint=1i")
+	assert.NotContains(t, m.String(), "nil")
+	assert.Contains(t, m.String(), fmt.Sprintf("maxuint64=%di", MaxInt))
+	assert.Contains(t, m.String(), fmt.Sprintf("maxuint=%di", MaxInt))
+}
+
+func TestIndexUnescapedByte(t *testing.T) {
+	tests := []struct {
+		in       []byte
+		b        byte
+		expected int
+	}{
+		{
+			in:       []byte(`foobar`),
+			b:        'b',
+			expected: 3,
+		},
+		{
+			in:       []byte(`foo\bar`),
+			b:        'b',
+			expected: -1,
+		},
+		{
+			in:       []byte(`foo\\bar`),
+			b:        'b',
+			expected: 5,
+		},
+		{
+			in:       []byte(`foobar`),
+			b:        'f',
+			expected: 0,
+		},
+		{
+			in:       []byte(`foobar`),
+			b:        'r',
+			expected: 5,
+		},
+		{
+			in:       []byte(`\foobar`),
+			b:        'f',
+			expected: -1,
+		},
+	}
+
+	for _, test := range tests {
+		got := indexUnescapedByte(test.in, test.b)
+		assert.Equal(t, test.expected, got)
+	}
+}
+
+func TestNewGaugeMetric(t *testing.T) {
+	now := time.Now()
+
+	tags := map[string]string{
+		"host":       "localhost",
+		"datacenter": "us-east-1",
+	}
+	fields := map[string]interface{}{
+		"usage_idle": float64(99),
+		"usage_busy": float64(1),
+	}
+	m, err := New("cpu", tags, fields, now, telegraf.Gauge)
+	assert.NoError(t, err)
+
+	assert.Equal(t, telegraf.Gauge, m.Type())
+	assert.Equal(t, tags, m.Tags())
+	assert.Equal(t, fields, m.Fields())
+	assert.Equal(t, "cpu", m.Name())
+	assert.Equal(t, now, m.Time())
+	assert.Equal(t, now.UnixNano(), m.UnixNano())
+}
+
+func TestNewCounterMetric(t *testing.T) {
+	now := time.Now()
+
+	tags := map[string]string{
+		"host":       "localhost",
+		"datacenter": "us-east-1",
+	}
+	fields := map[string]interface{}{
+		"usage_idle": float64(99),
+		"usage_busy": float64(1),
+	}
+	m, err := New("cpu", tags, fields, now, telegraf.Counter)
+	assert.NoError(t, err)
+
+	assert.Equal(t, telegraf.Counter, m.Type())
+	assert.Equal(t, tags, m.Tags())
+	assert.Equal(t, fields, m.Fields())
+	assert.Equal(t, "cpu", m.Name())
+	assert.Equal(t, now, m.Time())
+	assert.Equal(t, now.UnixNano(), m.UnixNano())
+}
+
+// test splitting metric into various max lengths
+func TestSplitMetric(t *testing.T) {
+	now := time.Unix(0, 1480940990034083306)
+	tags := map[string]string{
+		"host": "localhost",
+	}
+	fields := map[string]interface{}{
+		"float":  float64(100001),
+		"int":    int64(100001),
+		"bool":   true,
+		"false":  false,
+		"string": "test",
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+
+	split80 := m.Split(80)
+	assert.Len(t, split80, 2)
+
+	split70 := m.Split(70)
+	assert.Len(t, split70, 3)
+
+	split60 := m.Split(60)
+	assert.Len(t, split60, 4)
+}
+
+// test splitting metric into various max lengths
+// use a simple regex check to verify that the split metrics are valid
+func TestSplitMetric_RegexVerify(t *testing.T) {
+	now := time.Unix(0, 1480940990034083306)
+	tags := map[string]string{
+		"host": "localhost",
+	}
+	fields := map[string]interface{}{
+		"foo":     float64(98934259085),
+		"bar":     float64(19385292),
+		"number":  float64(19385292),
+		"another": float64(19385292),
+		"n":       float64(19385292),
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+
+	// verification regex
+	re := regexp.MustCompile(`cpu,host=localhost \w+=\d+(,\w+=\d+)* 1480940990034083306`)
+
+	split90 := m.Split(90)
+	assert.Len(t, split90, 2)
+	for _, splitM := range split90 {
+		assert.True(t, re.Match(splitM.Serialize()), splitM.String())
+	}
+
+	split70 := m.Split(70)
+	assert.Len(t, split70, 3)
+	for _, splitM := range split70 {
+		assert.True(t, re.Match(splitM.Serialize()), splitM.String())
+	}
+
+	split20 := m.Split(20)
+	assert.Len(t, split20, 5)
+	for _, splitM := range split20 {
+		assert.True(t, re.Match(splitM.Serialize()), splitM.String())
+	}
+}
+
+// test splitting metric even when given length is shorter than
+// shortest possible length
+// Split should split metric as short as possible, ie, 1 field per metric
+func TestSplitMetric_TooShort(t *testing.T) {
+	now := time.Unix(0, 1480940990034083306)
+	tags := map[string]string{
+		"host": "localhost",
+	}
+	fields := map[string]interface{}{
+		"float":  float64(100001),
+		"int":    int64(100001),
+		"bool":   true,
+		"false":  false,
+		"string": "test",
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+
+	split := m.Split(10)
+	assert.Len(t, split, 5)
+	strings := make([]string, 5)
+	for i, splitM := range split {
+		strings[i] = splitM.String()
+	}
+
+	assert.Contains(t, strings, "cpu,host=localhost float=100001 1480940990034083306\n")
+	assert.Contains(t, strings, "cpu,host=localhost int=100001i 1480940990034083306\n")
+	assert.Contains(t, strings, "cpu,host=localhost bool=true 1480940990034083306\n")
+	assert.Contains(t, strings, "cpu,host=localhost false=false 1480940990034083306\n")
+	assert.Contains(t, strings, "cpu,host=localhost string=\"test\" 1480940990034083306\n")
+}
+
+func TestSplitMetric_NoOp(t *testing.T) {
+	now := time.Unix(0, 1480940990034083306)
+	tags := map[string]string{
+		"host": "localhost",
+	}
+	fields := map[string]interface{}{
+		"float":  float64(100001),
+		"int":    int64(100001),
+		"bool":   true,
+		"false":  false,
+		"string": "test",
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+
+	split := m.Split(1000)
+	assert.Len(t, split, 1)
+	assert.Equal(t, m, split[0])
+}
+
+func TestSplitMetric_OneField(t *testing.T) {
+	now := time.Unix(0, 1480940990034083306)
+	tags := map[string]string{
+		"host": "localhost",
+	}
+	fields := map[string]interface{}{
+		"float": float64(100001),
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+
+	assert.Equal(t, "cpu,host=localhost float=100001 1480940990034083306\n", m.String())
+
+	split := m.Split(1000)
+	assert.Len(t, split, 1)
+	assert.Equal(t, "cpu,host=localhost float=100001 1480940990034083306\n", split[0].String())
+
+	split = m.Split(1)
+	assert.Len(t, split, 1)
+	assert.Equal(t, "cpu,host=localhost float=100001 1480940990034083306\n", split[0].String())
+
+	split = m.Split(40)
+	assert.Len(t, split, 1)
+	assert.Equal(t, "cpu,host=localhost float=100001 1480940990034083306\n", split[0].String())
+}
+
+func TestNewMetricAggregate(t *testing.T) {
+	now := time.Now()
+
+	tags := map[string]string{
+		"host": "localhost",
+	}
+	fields := map[string]interface{}{
+		"usage_idle": float64(99),
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+
+	assert.False(t, m.IsAggregate())
+	m.SetAggregate(true)
+	assert.True(t, m.IsAggregate())
+}
+
+func TestNewMetricPoint(t *testing.T) {
+	now := time.Now()
+
+	tags := map[string]string{
+		"host": "localhost",
+	}
+	fields := map[string]interface{}{
+		"usage_idle": float64(99),
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+
+	p := m.Point()
+
+	assert.Equal(t, fields, m.Fields())
+	assert.Equal(t, fields, p.Fields())
+	assert.Equal(t, "cpu", p.Name())
+}
+
+func TestNewMetricString(t *testing.T) {
+	now := time.Now()
+
+	tags := map[string]string{
+		"host": "localhost",
+	}
+	fields := map[string]interface{}{
+		"usage_idle": float64(99),
+	}
+	m, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+
+	lineProto := fmt.Sprintf("cpu,host=localhost usage_idle=99 %d\n",
+		now.UnixNano())
+	assert.Equal(t, lineProto, m.String())
+}
+
+func TestNewMetricFailNaN(t *testing.T) {
+	now := time.Now()
+
+	tags := map[string]string{
+		"host": "localhost",
+	}
+	fields := map[string]interface{}{
+		"usage_idle": math.NaN(),
+	}
+
+	_, err := New("cpu", tags, fields, now)
+	assert.NoError(t, err)
+}

metric/parse.go

@@ -0,0 +1,627 @@
+package metric
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/influxdata/telegraf"
+)
+
+var (
+	ErrInvalidNumber = errors.New("invalid number")
+)
+
+const (
+	// the number of characters for the largest possible int64 (9223372036854775807)
+	maxInt64Digits = 19
+
+	// the number of characters for the smallest possible int64 (-9223372036854775808)
+	minInt64Digits = 20
+
+	// the number of characters required for the largest float64 before a range check
+	// would occur during parsing
+	maxFloat64Digits = 25
+
+	// the number of characters required for smallest float64 before a range check occur
+	// would occur during parsing
+	minFloat64Digits = 27
+
+	MaxKeyLength = 65535
+)
+
+// The following constants allow us to specify which state to move to
+// next, when scanning sections of a Point.
+const (
+	tagKeyState = iota
+	tagValueState
+	fieldsState
+)
+
+func Parse(buf []byte) ([]telegraf.Metric, error) {
+	return ParseWithDefaultTime(buf, time.Now())
+}
+
+func ParseWithDefaultTime(buf []byte, t time.Time) ([]telegraf.Metric, error) {
+	if len(buf) <= 6 {
+		return []telegraf.Metric{}, makeError("buffer too short", buf, 0)
+	}
+	metrics := make([]telegraf.Metric, 0, bytes.Count(buf, []byte("\n"))+1)
+	var errStr string
+	i := 0
+	for {
+		j := bytes.IndexByte(buf[i:], '\n')
+		if j == -1 {
+			break
+		}
+		if len(buf[i:i+j]) < 2 {
+			i += j + 1 // increment i past the previous newline
+			continue
+		}
+
+		m, err := parseMetric(buf[i:i+j], t)
+		if err != nil {
+			i += j + 1 // increment i past the previous newline
+			errStr += " " + err.Error()
+			continue
+		}
+		i += j + 1 // increment i past the previous newline
+
+		metrics = append(metrics, m)
+	}
+
+	if len(errStr) > 0 {
+		return metrics, fmt.Errorf(errStr)
+	}
+	return metrics, nil
+}
+
+func parseMetric(buf []byte, defaultTime time.Time) (telegraf.Metric, error) {
+	var dTime string
+	// scan the first block which is measurement[,tag1=value1,tag2=value=2...]
+	pos, key, err := scanKey(buf, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	// measurement name is required
+	if len(key) == 0 {
+		return nil, fmt.Errorf("missing measurement")
+	}
+
+	if len(key) > MaxKeyLength {
+		return nil, fmt.Errorf("max key length exceeded: %v > %v", len(key), MaxKeyLength)
+	}
+
+	// scan the second block is which is field1=value1[,field2=value2,...]
+	pos, fields, err := scanFields(buf, pos)
+	if err != nil {
+		return nil, err
+	}
+
+	// at least one field is required
+	if len(fields) == 0 {
+		return nil, fmt.Errorf("missing fields")
+	}
+
+	// scan the last block which is an optional integer timestamp
+	pos, ts, err := scanTime(buf, pos)
+	if err != nil {
+		return nil, err
+	}
+
+	m := &metric{
+		fields: fields,
+		t:      ts,
+	}
+
+	// parse out the measurement name
+	// namei is the index at which the "name" ends
+	namei := indexUnescapedByte(key, ',')
+	if namei < 1 {
+		// no tags
+		m.name = key
+	} else {
+		m.name = key[0:namei]
+		m.tags = key[namei:]
+	}
+
+	if len(m.t) == 0 {
+		if len(dTime) == 0 {
+			dTime = fmt.Sprint(defaultTime.UnixNano())
+		}
+		// use default time
+		m.t = []byte(dTime)
+	}
+
+	// here we copy on return because this allows us to later call
+	// AddTag, AddField, RemoveTag, RemoveField, etc. without worrying about
+	// modifying 'tag' bytes having an affect on 'field' bytes, for example.
+	return m.Copy(), nil
+}
+
+// scanKey scans buf starting at i for the measurement and tag portion of the point.
+// It returns the ending position and the byte slice of key within buf.  If there
+// are tags, they will be sorted if they are not already.
+func scanKey(buf []byte, i int) (int, []byte, error) {
+	start := skipWhitespace(buf, i)
+	i = start
+
+	// First scan the Point's measurement.
+	state, i, err := scanMeasurement(buf, i)
+	if err != nil {
+		return i, buf[start:i], err
+	}
+
+	// Optionally scan tags if needed.
+	if state == tagKeyState {
+		i, err = scanTags(buf, i)
+		if err != nil {
+			return i, buf[start:i], err
+		}
+	}
+
+	return i, buf[start:i], nil
+}
+
+// scanMeasurement examines the measurement part of a Point, returning
+// the next state to move to, and the current location in the buffer.
+func scanMeasurement(buf []byte, i int) (int, int, error) {
+	// Check first byte of measurement, anything except a comma is fine.
+	// It can't be a space, since whitespace is stripped prior to this
+	// function call.
+	if i >= len(buf) || buf[i] == ',' {
+		return -1, i, makeError("missing measurement", buf, i)
+	}
+
+	for {
+		i++
+		if i >= len(buf) {
+			// cpu
+			return -1, i, makeError("missing fields", buf, i)
+		}
+
+		if buf[i-1] == '\\' {
+			// Skip character (it's escaped).
+			continue
+		}
+
+		// Unescaped comma; move onto scanning the tags.
+		if buf[i] == ',' {
+			return tagKeyState, i + 1, nil
+		}
+
+		// Unescaped space; move onto scanning the fields.
+		if buf[i] == ' ' {
+			// cpu value=1.0
+			return fieldsState, i, nil
+		}
+	}
+}
+
+// scanTags examines all the tags in a Point, keeping track of and
+// returning the updated indices slice, number of commas and location
+// in buf where to start examining the Point fields.
+func scanTags(buf []byte, i int) (int, error) {
+	var (
+		err   error
+		state = tagKeyState
+	)
+
+	for {
+		switch state {
+		case tagKeyState:
+			i, err = scanTagsKey(buf, i)
+			state = tagValueState // tag value always follows a tag key
+		case tagValueState:
+			state, i, err = scanTagsValue(buf, i)
+		case fieldsState:
+			return i, nil
+		}
+
+		if err != nil {
+			return i, err
+		}
+	}
+}
+
+// scanTagsKey scans each character in a tag key.
+func scanTagsKey(buf []byte, i int) (int, error) {
+	// First character of the key.
+	if i >= len(buf) || buf[i] == ' ' || buf[i] == ',' || buf[i] == '=' {
+		// cpu,{'', ' ', ',', '='}
+		return i, makeError("missing tag key", buf, i)
+	}
+
+	// Examine each character in the tag key until we hit an unescaped
+	// equals (the tag value), or we hit an error (i.e., unescaped
+	// space or comma).
+	for {
+		i++
+
+		// Either we reached the end of the buffer or we hit an
+		// unescaped comma or space.
+		if i >= len(buf) ||
+			((buf[i] == ' ' || buf[i] == ',') && buf[i-1] != '\\') {
+			// cpu,tag{'', ' ', ','}
+			return i, makeError("missing tag value", buf, i)
+		}
+
+		if buf[i] == '=' && buf[i-1] != '\\' {
+			// cpu,tag=
+			return i + 1, nil
+		}
+	}
+}
+
+// scanTagsValue scans each character in a tag value.
+func scanTagsValue(buf []byte, i int) (int, int, error) {
+	// Tag value cannot be empty.
+	if i >= len(buf) || buf[i] == ',' || buf[i] == ' ' {
+		// cpu,tag={',', ' '}
+		return -1, i, makeError("missing tag value", buf, i)
+	}
+
+	// Examine each character in the tag value until we hit an unescaped
+	// comma (move onto next tag key), an unescaped space (move onto
+	// fields), or we error out.
+	for {
+		i++
+		if i >= len(buf) {
+			// cpu,tag=value
+			return -1, i, makeError("missing fields", buf, i)
+		}
+
+		// An unescaped equals sign is an invalid tag value.
+		if buf[i] == '=' && buf[i-1] != '\\' {
+			// cpu,tag={'=', 'fo=o'}
+			return -1, i, makeError("invalid tag format", buf, i)
+		}
+
+		if buf[i] == ',' && buf[i-1] != '\\' {
+			// cpu,tag=foo,
+			return tagKeyState, i + 1, nil
+		}
+
+		// cpu,tag=foo value=1.0
+		// cpu, tag=foo\= value=1.0
+		if buf[i] == ' ' && buf[i-1] != '\\' {
+			return fieldsState, i, nil
+		}
+	}
+}
+
+// scanFields scans buf, starting at i for the fields section of a point.  It returns
+// the ending position and the byte slice of the fields within buf
+func scanFields(buf []byte, i int) (int, []byte, error) {
+	start := skipWhitespace(buf, i)
+	i = start
+	quoted := false
+
+	// tracks how many '=' we've seen
+	equals := 0
+
+	// tracks how many commas we've seen
+	commas := 0
+
+	for {
+		// reached the end of buf?
+		if i >= len(buf) {
+			break
+		}
+
+		// escaped characters?
+		if buf[i] == '\\' && i+1 < len(buf) {
+			i += 2
+			continue
+		}
+
+		// If the value is quoted, scan until we get to the end quote
+		// Only quote values in the field value since quotes are not significant
+		// in the field key
+		if buf[i] == '"' && equals > commas {
+			quoted = !quoted
+			i++
+			continue
+		}
+
+		// If we see an =, ensure that there is at least on char before and after it
+		if buf[i] == '=' && !quoted {
+			equals++
+
+			// check for "... =123" but allow "a\ =123"
+			if buf[i-1] == ' ' && buf[i-2] != '\\' {
+				return i, buf[start:i], makeError("missing field key", buf, i)
+			}
+
+			// check for "...a=123,=456" but allow "a=123,a\,=456"
+			if buf[i-1] == ',' && buf[i-2] != '\\' {
+				return i, buf[start:i], makeError("missing field key", buf, i)
+			}
+
+			// check for "... value="
+			if i+1 >= len(buf) {
+				return i, buf[start:i], makeError("missing field value", buf, i)
+			}
+
+			// check for "... value=,value2=..."
+			if buf[i+1] == ',' || buf[i+1] == ' ' {
+				return i, buf[start:i], makeError("missing field value", buf, i)
+			}
+
+			if isNumeric(buf[i+1]) || buf[i+1] == '-' || buf[i+1] == 'N' || buf[i+1] == 'n' {
+				var err error
+				i, err = scanNumber(buf, i+1)
+				if err != nil {
+					return i, buf[start:i], err
+				}
+				continue
+			}
+			// If next byte is not a double-quote, the value must be a boolean
+			if buf[i+1] != '"' {
+				var err error
+				i, _, err = scanBoolean(buf, i+1)
+				if err != nil {
+					return i, buf[start:i], err
+				}
+				continue
+			}
+		}
+
+		if buf[i] == ',' && !quoted {
+			commas++
+		}
+
+		// reached end of block?
+		if buf[i] == ' ' && !quoted {
+			break
+		}
+		i++
+	}
+
+	if quoted {
+		return i, buf[start:i], makeError("unbalanced quotes", buf, i)
+	}
+
+	// check that all field sections had key and values (e.g. prevent "a=1,b"
+	if equals == 0 || commas != equals-1 {
+		return i, buf[start:i], makeError("invalid field format", buf, i)
+	}
+
+	return i, buf[start:i], nil
+}
+
+// scanTime scans buf, starting at i for the time section of a point. It
+// returns the ending position and the byte slice of the timestamp within buf
+// and and error if the timestamp is not in the correct numeric format.
+func scanTime(buf []byte, i int) (int, []byte, error) {
+	start := skipWhitespace(buf, i)
+	i = start
+
+	for {
+		// reached the end of buf?
+		if i >= len(buf) {
+			break
+		}
+
+		// Reached end of block or trailing whitespace?
+		if buf[i] == '\n' || buf[i] == ' ' {
+			break
+		}
+
+		// Handle negative timestamps
+		if i == start && buf[i] == '-' {
+			i++
+			continue
+		}
+
+		// Timestamps should be integers, make sure they are so we don't need
+		// to actually  parse the timestamp until needed.
+		if buf[i] < '0' || buf[i] > '9' {
+			return i, buf[start:i], makeError("invalid timestamp", buf, i)
+		}
+		i++
+	}
+	return i, buf[start:i], nil
+}
+
+func isNumeric(b byte) bool {
+	return (b >= '0' && b <= '9') || b == '.'
+}
+
+// scanNumber returns the end position within buf, start at i after
+// scanning over buf for an integer, or float.  It returns an
+// error if a invalid number is scanned.
+func scanNumber(buf []byte, i int) (int, error) {
+	start := i
+	var isInt bool
+
+	// Is negative number?
+	if i < len(buf) && buf[i] == '-' {
+		i++
+		// There must be more characters now, as just '-' is illegal.
+		if i == len(buf) {
+			return i, ErrInvalidNumber
+		}
+	}
+
+	// how many decimal points we've see
+	decimal := false
+
+	// indicates the number is float in scientific notation
+	scientific := false
+
+	for {
+		if i >= len(buf) {
+			break
+		}
+
+		if buf[i] == ',' || buf[i] == ' ' {
+			break
+		}
+
+		if buf[i] == 'i' && i > start && !isInt {
+			isInt = true
+			i++
+			continue
+		}
+
+		if buf[i] == '.' {
+			// Can't have more than 1 decimal (e.g. 1.1.1 should fail)
+			if decimal {
+				return i, ErrInvalidNumber
+			}
+			decimal = true
+		}
+
+		// `e` is valid for floats but not as the first char
+		if i > start && (buf[i] == 'e' || buf[i] == 'E') {
+			scientific = true
+			i++
+			continue
+		}
+
+		// + and - are only valid at this point if they follow an e (scientific notation)
+		if (buf[i] == '+' || buf[i] == '-') && (buf[i-1] == 'e' || buf[i-1] == 'E') {
+			i++
+			continue
+		}
+
+		// NaN is an unsupported value
+		if i+2 < len(buf) && (buf[i] == 'N' || buf[i] == 'n') {
+			return i, ErrInvalidNumber
+		}
+
+		if !isNumeric(buf[i]) {
+			return i, ErrInvalidNumber
+		}
+		i++
+	}
+
+	if isInt && (decimal || scientific) {
+		return i, ErrInvalidNumber
+	}
+
+	numericDigits := i - start
+	if isInt {
+		numericDigits--
+	}
+	if decimal {
+		numericDigits--
+	}
+	if buf[start] == '-' {
+		numericDigits--
+	}
+
+	if numericDigits == 0 {
+		return i, ErrInvalidNumber
+	}
+
+	// It's more common that numbers will be within min/max range for their type but we need to prevent
+	// out or range numbers from being parsed successfully.  This uses some simple heuristics to decide
+	// if we should parse the number to the actual type.  It does not do it all the time because it incurs
+	// extra allocations and we end up converting the type again when writing points to disk.
+	if isInt {
+		// Make sure the last char is an 'i' for integers (e.g. 9i10 is not valid)
+		if buf[i-1] != 'i' {
+			return i, ErrInvalidNumber
+		}
+		// Parse the int to check bounds the number of digits could be larger than the max range
+		// We subtract 1 from the index to remove the `i` from our tests
+		if len(buf[start:i-1]) >= maxInt64Digits || len(buf[start:i-1]) >= minInt64Digits {
+			if _, err := parseIntBytes(buf[start:i-1], 10, 64); err != nil {
+				return i, makeError(fmt.Sprintf("unable to parse integer %s: %s", buf[start:i-1], err), buf, i)
+			}
+		}
+	} else {
+		// Parse the float to check bounds if it's scientific or the number of digits could be larger than the max range
+		if scientific || len(buf[start:i]) >= maxFloat64Digits || len(buf[start:i]) >= minFloat64Digits {
+			if _, err := parseFloatBytes(buf[start:i], 10); err != nil {
+				return i, makeError("invalid float", buf, i)
+			}
+		}
+	}
+
+	return i, nil
+}
+
+// scanBoolean returns the end position within buf, start at i after
+// scanning over buf for boolean. Valid values for a boolean are
+// t, T, true, TRUE, f, F, false, FALSE. It returns an error if a invalid boolean
+// is scanned.
+func scanBoolean(buf []byte, i int) (int, []byte, error) {
+	start := i
+
+	if i < len(buf) && (buf[i] != 't' && buf[i] != 'f' && buf[i] != 'T' && buf[i] != 'F') {
+		return i, buf[start:i], makeError("invalid value", buf, i)
+	}
+
+	i++
+	for {
+		if i >= len(buf) {
+			break
+		}
+
+		if buf[i] == ',' || buf[i] == ' ' {
+			break
+		}
+		i++
+	}
+
+	// Single char bool (t, T, f, F) is ok
+	if i-start == 1 {
+		return i, buf[start:i], nil
+	}
+
+	// length must be 4 for true or TRUE
+	if (buf[start] == 't' || buf[start] == 'T') && i-start != 4 {
+		return i, buf[start:i], makeError("invalid boolean", buf, i)
+	}
+
+	// length must be 5 for false or FALSE
+	if (buf[start] == 'f' || buf[start] == 'F') && i-start != 5 {
+		return i, buf[start:i], makeError("invalid boolean", buf, i)
+	}
+
+	// Otherwise
+	valid := false
+	switch buf[start] {
+	case 't':
+		valid = bytes.Equal(buf[start:i], []byte("true"))
+	case 'f':
+		valid = bytes.Equal(buf[start:i], []byte("false"))
+	case 'T':
+		valid = bytes.Equal(buf[start:i], []byte("TRUE")) || bytes.Equal(buf[start:i], []byte("True"))
+	case 'F':
+		valid = bytes.Equal(buf[start:i], []byte("FALSE")) || bytes.Equal(buf[start:i], []byte("False"))
+	}
+
+	if !valid {
+		return i, buf[start:i], makeError("invalid boolean", buf, i)
+	}
+
+	return i, buf[start:i], nil
+
+}
+
+// skipWhitespace returns the end position within buf, starting at i after
+// scanning over spaces in tags
+func skipWhitespace(buf []byte, i int) int {
+	for i < len(buf) {
+		if buf[i] != ' ' && buf[i] != '\t' && buf[i] != 0 {
+			break
+		}
+		i++
+	}
+	return i
+}
+
+// makeError is a helper function for making a metric parsing error.
+//   reason is the reason that the error occured.
+//   buf should be the current buffer we are parsing.
+//   i is the current index, to give some context on where in the buffer we are.
+func makeError(reason string, buf []byte, i int) error {
+	return fmt.Errorf("metric parsing error, reason: [%s], buffer: [%s], index: [%d]",
+		reason, buf, i)
+}

metric/parse_test.go

@@ -0,0 +1,355 @@
+package metric
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+const trues = `booltest b=T
+booltest b=t
+booltest b=True
+booltest b=TRUE
+booltest b=true
+`
+
+const falses = `booltest b=F
+booltest b=f
+booltest b=False
+booltest b=FALSE
+booltest b=false
+`
+
+const withEscapes = `w\,\ eather,host=local temp=99 1465839830100400200
+w\,eather,host=local temp=99 1465839830100400200
+weather,location=us\,midwest temperature=82 1465839830100400200
+weather,location=us-midwest temp\=rature=82 1465839830100400200
+weather,location\ place=us-midwest temperature=82 1465839830100400200
+weather,location=us-midwest temperature="too\"hot\"" 1465839830100400200
+`
+
+const withTimestamps = `cpu usage=99 1480595849000000000
+cpu usage=99 1480595850000000000
+cpu usage=99 1480595851700030000
+cpu usage=99 1480595852000000300
+`
+
+const sevenMetrics = `cpu,host=foo,datacenter=us-east idle=99,busy=1i,b=true,s="string"
+cpu,host=foo,datacenter=us-east idle=99,busy=1i,b=true,s="string"
+cpu,host=foo,datacenter=us-east idle=99,busy=1i,b=true,s="string"
+cpu,host=foo,datacenter=us-east idle=99,busy=1i,b=true,s="string"
+cpu,host=foo,datacenter=us-east idle=99,busy=1i,b=true,s="string"
+cpu,host=foo,datacenter=us-east idle=99,busy=1i,b=true,s="string"
+cpu,host=foo,datacenter=us-east idle=99,busy=1i,b=true,s="string"
+`
+
+// some metrics are invalid
+const someInvalid = `cpu,host=foo,datacenter=us-east usage_idle=99,usage_busy=1
+cpu,host=foo,datacenter=us-east usage_idle=99,usage_busy=1
+cpu,host=foo,datacenter=us-east usage_idle=99,usage_busy=1
+cpu,cpu=cpu3, host=foo,datacenter=us-east usage_idle=99,usage_busy=1
+cpu,cpu=cpu4 , usage_idle=99,usage_busy=1
+cpu 1480595852000000300
+cpu usage=99 1480595852foobar300
+cpu,host=foo,datacenter=us-east usage_idle=99,usage_busy=1
+`
+
+func TestParse(t *testing.T) {
+	start := time.Now()
+	metrics, err := Parse([]byte(sevenMetrics))
+	assert.NoError(t, err)
+	assert.Len(t, metrics, 7)
+
+	// all metrics parsed together w/o a timestamp should have the same time.
+	firstTime := metrics[0].Time()
+	for _, m := range metrics {
+		assert.Equal(t,
+			map[string]interface{}{
+				"idle": float64(99),
+				"busy": int64(1),
+				"b":    true,
+				"s":    "string",
+			},
+			m.Fields(),
+		)
+		assert.Equal(t,
+			map[string]string{
+				"host":       "foo",
+				"datacenter": "us-east",
+			},
+			m.Tags(),
+		)
+		assert.True(t, m.Time().After(start))
+		assert.True(t, m.Time().Equal(firstTime))
+	}
+}
+
+func TestParseErrors(t *testing.T) {
+	start := time.Now()
+	metrics, err := Parse([]byte(someInvalid))
+	assert.Error(t, err)
+	assert.Len(t, metrics, 4)
+
+	// all metrics parsed together w/o a timestamp should have the same time.
+	firstTime := metrics[0].Time()
+	for _, m := range metrics {
+		assert.Equal(t,
+			map[string]interface{}{
+				"usage_idle": float64(99),
+				"usage_busy": float64(1),
+			},
+			m.Fields(),
+		)
+		assert.Equal(t,
+			map[string]string{
+				"host":       "foo",
+				"datacenter": "us-east",
+			},
+			m.Tags(),
+		)
+		assert.True(t, m.Time().After(start))
+		assert.True(t, m.Time().Equal(firstTime))
+	}
+}
+
+func TestParseWithTimestamps(t *testing.T) {
+	metrics, err := Parse([]byte(withTimestamps))
+	assert.NoError(t, err)
+	assert.Len(t, metrics, 4)
+
+	expectedTimestamps := []time.Time{
+		time.Unix(0, 1480595849000000000),
+		time.Unix(0, 1480595850000000000),
+		time.Unix(0, 1480595851700030000),
+		time.Unix(0, 1480595852000000300),
+	}
+
+	// all metrics parsed together w/o a timestamp should have the same time.
+	for i, m := range metrics {
+		assert.Equal(t,
+			map[string]interface{}{
+				"usage": float64(99),
+			},
+			m.Fields(),
+		)
+		assert.True(t, m.Time().Equal(expectedTimestamps[i]))
+	}
+}
+
+func TestParseEscapes(t *testing.T) {
+	metrics, err := Parse([]byte(withEscapes))
+	assert.NoError(t, err)
+	assert.Len(t, metrics, 6)
+
+	tests := []struct {
+		name   string
+		fields map[string]interface{}
+		tags   map[string]string
+	}{
+		{
+			name:   `w, eather`,
+			fields: map[string]interface{}{"temp": float64(99)},
+			tags:   map[string]string{"host": "local"},
+		},
+		{
+			name:   `w,eather`,
+			fields: map[string]interface{}{"temp": float64(99)},
+			tags:   map[string]string{"host": "local"},
+		},
+		{
+			name:   `weather`,
+			fields: map[string]interface{}{"temperature": float64(82)},
+			tags:   map[string]string{"location": `us,midwest`},
+		},
+		{
+			name:   `weather`,
+			fields: map[string]interface{}{`temp=rature`: float64(82)},
+			tags:   map[string]string{"location": `us-midwest`},
+		},
+		{
+			name:   `weather`,
+			fields: map[string]interface{}{"temperature": float64(82)},
+			tags:   map[string]string{`location place`: `us-midwest`},
+		},
+		{
+			name:   `weather`,
+			fields: map[string]interface{}{`temperature`: `too"hot"`},
+			tags:   map[string]string{"location": `us-midwest`},
+		},
+	}
+
+	for i, test := range tests {
+		assert.Equal(t, test.name, metrics[i].Name())
+		assert.Equal(t, test.fields, metrics[i].Fields())
+		assert.Equal(t, test.tags, metrics[i].Tags())
+	}
+}
+
+func TestParseTrueBooleans(t *testing.T) {
+	metrics, err := Parse([]byte(trues))
+	assert.NoError(t, err)
+	assert.Len(t, metrics, 5)
+
+	for _, metric := range metrics {
+		assert.Equal(t, "booltest", metric.Name())
+		assert.Equal(t, true, metric.Fields()["b"])
+	}
+}
+
+func TestParseFalseBooleans(t *testing.T) {
+	metrics, err := Parse([]byte(falses))
+	assert.NoError(t, err)
+	assert.Len(t, metrics, 5)
+
+	for _, metric := range metrics {
+		assert.Equal(t, "booltest", metric.Name())
+		assert.Equal(t, false, metric.Fields()["b"])
+	}
+}
+
+func TestParsePointBadNumber(t *testing.T) {
+	for _, tt := range []string{
+		"cpu v=- ",
+		"cpu v=-i ",
+		"cpu v=-. ",
+		"cpu v=. ",
+		"cpu v=1.0i ",
+		"cpu v=1ii ",
+		"cpu v=1a ",
+		"cpu v=-e-e-e ",
+		"cpu v=42+3 ",
+		"cpu v= ",
+	} {
+		_, err := Parse([]byte(tt + "\n"))
+		assert.Error(t, err, tt)
+	}
+}
+
+func TestParseTagsMissingParts(t *testing.T) {
+	for _, tt := range []string{
+		`cpu,host`,
+		`cpu,host,`,
+		`cpu,host=`,
+		`cpu,f=oo=bar value=1`,
+		`cpu,host value=1i`,
+		`cpu,host=serverA,region value=1i`,
+		`cpu,host=serverA,region= value=1i`,
+		`cpu,host=serverA,region=,zone=us-west value=1i`,
+		`cpu, value=1`,
+		`cpu, ,,`,
+		`cpu,,,`,
+		`cpu,host=serverA,=us-east value=1i`,
+		`cpu,host=serverAa\,,=us-east value=1i`,
+		`cpu,host=serverA\,,=us-east value=1i`,
+		`cpu, =serverA value=1i`,
+	} {
+		_, err := Parse([]byte(tt + "\n"))
+		assert.Error(t, err, tt)
+	}
+}
+
+func TestParsePointWhitespace(t *testing.T) {
+	for _, tt := range []string{
+		`cpu    value=1.0 1257894000000000000`,
+		`cpu value=1.0     1257894000000000000`,
+		`cpu      value=1.0     1257894000000000000`,
+		`cpu value=1.0 1257894000000000000   `,
+	} {
+		m, err := Parse([]byte(tt + "\n"))
+		assert.NoError(t, err, tt)
+		assert.Equal(t, "cpu", m[0].Name())
+		assert.Equal(t, map[string]interface{}{"value": float64(1)}, m[0].Fields())
+	}
+}
+
+func TestParsePointInvalidFields(t *testing.T) {
+	for _, tt := range []string{
+		"test,foo=bar a=101,=value",
+		"test,foo=bar =value",
+		"test,foo=bar a=101,key=",
+		"test,foo=bar key=",
+		`test,foo=bar a=101,b="foo`,
+	} {
+		_, err := Parse([]byte(tt + "\n"))
+		assert.Error(t, err, tt)
+	}
+}
+
+func TestParsePointNoFields(t *testing.T) {
+	for _, tt := range []string{
+		"cpu_load_short,host=server01,region=us-west",
+		"very_long_measurement_name",
+		"cpu,host==",
+		"============",
+		"cpu",
+		"cpu\n\n\n\n\n\n\n",
+		"                ",
+	} {
+		_, err := Parse([]byte(tt + "\n"))
+		assert.Error(t, err, tt)
+	}
+}
+
+// a b=1 << this is the shortest possible metric
+// any shorter is just ignored
+func TestParseBufTooShort(t *testing.T) {
+	for _, tt := range []string{
+		"",
+		"a",
+		"a ",
+		"a b=",
+	} {
+		_, err := Parse([]byte(tt + "\n"))
+		assert.Error(t, err, tt)
+	}
+}
+
+func TestParseInvalidBooleans(t *testing.T) {
+	for _, tt := range []string{
+		"test b=tru",
+		"test b=fals",
+		"test b=faLse",
+		"test q=foo",
+		"test b=lambchops",
+	} {
+		_, err := Parse([]byte(tt + "\n"))
+		assert.Error(t, err, tt)
+	}
+}
+
+func TestParseInvalidNumbers(t *testing.T) {
+	for _, tt := range []string{
+		"test b=-",
+		"test b=1.1.1",
+		"test b=nan",
+		"test b=9i10",
+		"test b=9999999999999999999i",
+	} {
+		_, err := Parse([]byte(tt + "\n"))
+		assert.Error(t, err, tt)
+	}
+}
+
+func TestParseNegativeTimestamps(t *testing.T) {
+	for _, tt := range []string{
+		"test foo=101 -1257894000000000000",
+	} {
+		metrics, err := Parse([]byte(tt + "\n"))
+		assert.NoError(t, err, tt)
+		assert.True(t, metrics[0].Time().Equal(time.Unix(0, -1257894000000000000)))
+	}
+}
+
+func TestParseMaxKeyLength(t *testing.T) {
+	key := ""
+	for {
+		if len(key) > MaxKeyLength {
+			break
+		}
+		key += "test"
+	}
+
+	_, err := Parse([]byte(key + " value=1\n"))
+	assert.Error(t, err)
+}

output.go

@@ -0,0 +1,31 @@
+package telegraf
+
+type Output interface {
+	// Connect to the Output
+	Connect() error
+	// Close any connections to the Output
+	Close() error
+	// Description returns a one-sentence description on the Output
+	Description() string
+	// SampleConfig returns the default configuration of the Output
+	SampleConfig() string
+	// Write takes in group of points to be written to the Output
+	Write(metrics []Metric) error
+}
+
+type ServiceOutput interface {
+	// Connect to the Output
+	Connect() error
+	// Close any connections to the Output
+	Close() error
+	// Description returns a one-sentence description on the Output
+	Description() string
+	// SampleConfig returns the default configuration of the Output
+	SampleConfig() string
+	// Write takes in group of points to be written to the Output
+	Write(metrics []Metric) error
+	// Start the "service" that will provide an Output
+	Start() error
+	// Stop the "service" that will provide an Output
+	Stop()
+}

plugins/aggregators/all/all.go

@@ -0,0 +1,5 @@
+package all
+
+import (
+	_ "github.com/influxdata/telegraf/plugins/aggregators/minmax"
+)

plugins/aggregators/minmax/README.md

@@ -0,0 +1,42 @@
+# MinMax Aggregator Plugin
+
+The minmax aggregator plugin aggregates min & max values of each field it sees,
+emitting the aggrate every `period` seconds.
+
+### Configuration:
+
+```toml
+# Keep the aggregate min/max of each metric passing through.
+[[aggregators.minmax]]
+  ## General Aggregator Arguments:
+  ## The period on which to flush & clear the aggregator.
+  period = "30s"
+  ## If true, the original metric will be dropped by the
+  ## aggregator and will not get sent to the output plugins.
+  drop_original = false
+```
+
+### Measurements & Fields:
+
+- measurement1
+    - field1_max
+    - field1_min
+
+### Tags:
+
+No tags are applied by this aggregator.
+
+### Example Output:
+
+```
+$ telegraf --config telegraf.conf --quiet
+system,host=tars load1=1.72 1475583980000000000
+system,host=tars load1=1.6 1475583990000000000
+system,host=tars load1=1.66 1475584000000000000
+system,host=tars load1=1.63 1475584010000000000
+system,host=tars load1_max=1.72,load1_min=1.6 1475584010000000000
+system,host=tars load1=1.46 1475584020000000000
+system,host=tars load1=1.39 1475584030000000000
+system,host=tars load1=1.41 1475584040000000000
+system,host=tars load1_max=1.46,load1_min=1.39 1475584040000000000
+```

plugins/aggregators/minmax/minmax.go

@@ -0,0 +1,119 @@
+package minmax
+
+import (
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/aggregators"
+)
+
+type MinMax struct {
+	cache map[uint64]aggregate
+}
+
+func NewMinMax() telegraf.Aggregator {
+	mm := &MinMax{}
+	mm.Reset()
+	return mm
+}
+
+type aggregate struct {
+	fields map[string]minmax
+	name   string
+	tags   map[string]string
+}
+
+type minmax struct {
+	min float64
+	max float64
+}
+
+var sampleConfig = `
+  ## General Aggregator Arguments:
+  ## The period on which to flush & clear the aggregator.
+  period = "30s"
+  ## If true, the original metric will be dropped by the
+  ## aggregator and will not get sent to the output plugins.
+  drop_original = false
+`
+
+func (m *MinMax) SampleConfig() string {
+	return sampleConfig
+}
+
+func (m *MinMax) Description() string {
+	return "Keep the aggregate min/max of each metric passing through."
+}
+
+func (m *MinMax) Add(in telegraf.Metric) {
+	id := in.HashID()
+	if _, ok := m.cache[id]; !ok {
+		// hit an uncached metric, create caches for first time:
+		a := aggregate{
+			name:   in.Name(),
+			tags:   in.Tags(),
+			fields: make(map[string]minmax),
+		}
+		for k, v := range in.Fields() {
+			if fv, ok := convert(v); ok {
+				a.fields[k] = minmax{
+					min: fv,
+					max: fv,
+				}
+			}
+		}
+		m.cache[id] = a
+	} else {
+		for k, v := range in.Fields() {
+			if fv, ok := convert(v); ok {
+				if _, ok := m.cache[id].fields[k]; !ok {
+					// hit an uncached field of a cached metric
+					m.cache[id].fields[k] = minmax{
+						min: fv,
+						max: fv,
+					}
+					continue
+				}
+				if fv < m.cache[id].fields[k].min {
+					tmp := m.cache[id].fields[k]
+					tmp.min = fv
+					m.cache[id].fields[k] = tmp
+				} else if fv > m.cache[id].fields[k].max {
+					tmp := m.cache[id].fields[k]
+					tmp.max = fv
+					m.cache[id].fields[k] = tmp
+				}
+			}
+		}
+	}
+}
+
+func (m *MinMax) Push(acc telegraf.Accumulator) {
+	for _, aggregate := range m.cache {
+		fields := map[string]interface{}{}
+		for k, v := range aggregate.fields {
+			fields[k+"_min"] = v.min
+			fields[k+"_max"] = v.max
+		}
+		acc.AddFields(aggregate.name, fields, aggregate.tags)
+	}
+}
+
+func (m *MinMax) Reset() {
+	m.cache = make(map[uint64]aggregate)
+}
+
+func convert(in interface{}) (float64, bool) {
+	switch v := in.(type) {
+	case float64:
+		return v, true
+	case int64:
+		return float64(v), true
+	default:
+		return 0, false
+	}
+}
+
+func init() {
+	aggregators.Add("minmax", func() telegraf.Aggregator {
+		return NewMinMax()
+	})
+}

plugins/aggregators/minmax/minmax_test.go

@@ -0,0 +1,162 @@
+package minmax
+
+import (
+	"testing"
+	"time"
+
+	"github.com/influxdata/telegraf/metric"
+	"github.com/influxdata/telegraf/testutil"
+)
+
+var m1, _ = metric.New("m1",
+	map[string]string{"foo": "bar"},
+	map[string]interface{}{
+		"a": int64(1),
+		"b": int64(1),
+		"c": int64(1),
+		"d": int64(1),
+		"e": int64(1),
+		"f": float64(2),
+		"g": float64(2),
+		"h": float64(2),
+		"i": float64(2),
+		"j": float64(3),
+	},
+	time.Now(),
+)
+var m2, _ = metric.New("m1",
+	map[string]string{"foo": "bar"},
+	map[string]interface{}{
+		"a":        int64(1),
+		"b":        int64(3),
+		"c":        int64(3),
+		"d":        int64(3),
+		"e":        int64(3),
+		"f":        float64(1),
+		"g":        float64(1),
+		"h":        float64(1),
+		"i":        float64(1),
+		"j":        float64(1),
+		"k":        float64(200),
+		"ignoreme": "string",
+		"andme":    true,
+	},
+	time.Now(),
+)
+
+func BenchmarkApply(b *testing.B) {
+	minmax := NewMinMax()
+
+	for n := 0; n < b.N; n++ {
+		minmax.Add(m1)
+		minmax.Add(m2)
+	}
+}
+
+// Test two metrics getting added.
+func TestMinMaxWithPeriod(t *testing.T) {
+	acc := testutil.Accumulator{}
+	minmax := NewMinMax()
+
+	minmax.Add(m1)
+	minmax.Add(m2)
+	minmax.Push(&acc)
+
+	expectedFields := map[string]interface{}{
+		"a_max": float64(1),
+		"a_min": float64(1),
+		"b_max": float64(3),
+		"b_min": float64(1),
+		"c_max": float64(3),
+		"c_min": float64(1),
+		"d_max": float64(3),
+		"d_min": float64(1),
+		"e_max": float64(3),
+		"e_min": float64(1),
+		"f_max": float64(2),
+		"f_min": float64(1),
+		"g_max": float64(2),
+		"g_min": float64(1),
+		"h_max": float64(2),
+		"h_min": float64(1),
+		"i_max": float64(2),
+		"i_min": float64(1),
+		"j_max": float64(3),
+		"j_min": float64(1),
+		"k_max": float64(200),
+		"k_min": float64(200),
+	}
+	expectedTags := map[string]string{
+		"foo": "bar",
+	}
+	acc.AssertContainsTaggedFields(t, "m1", expectedFields, expectedTags)
+}
+
+// Test two metrics getting added with a push/reset in between (simulates
+// getting added in different periods.)
+func TestMinMaxDifferentPeriods(t *testing.T) {
+	acc := testutil.Accumulator{}
+	minmax := NewMinMax()
+
+	minmax.Add(m1)
+	minmax.Push(&acc)
+	expectedFields := map[string]interface{}{
+		"a_max": float64(1),
+		"a_min": float64(1),
+		"b_max": float64(1),
+		"b_min": float64(1),
+		"c_max": float64(1),
+		"c_min": float64(1),
+		"d_max": float64(1),
+		"d_min": float64(1),
+		"e_max": float64(1),
+		"e_min": float64(1),
+		"f_max": float64(2),
+		"f_min": float64(2),
+		"g_max": float64(2),
+		"g_min": float64(2),
+		"h_max": float64(2),
+		"h_min": float64(2),
+		"i_max": float64(2),
+		"i_min": float64(2),
+		"j_max": float64(3),
+		"j_min": float64(3),
+	}
+	expectedTags := map[string]string{
+		"foo": "bar",
+	}
+	acc.AssertContainsTaggedFields(t, "m1", expectedFields, expectedTags)
+
+	acc.ClearMetrics()
+	minmax.Reset()
+	minmax.Add(m2)
+	minmax.Push(&acc)
+	expectedFields = map[string]interface{}{
+		"a_max": float64(1),
+		"a_min": float64(1),
+		"b_max": float64(3),
+		"b_min": float64(3),
+		"c_max": float64(3),
+		"c_min": float64(3),
+		"d_max": float64(3),
+		"d_min": float64(3),
+		"e_max": float64(3),
+		"e_min": float64(3),
+		"f_max": float64(1),
+		"f_min": float64(1),
+		"g_max": float64(1),
+		"g_min": float64(1),
+		"h_max": float64(1),
+		"h_min": float64(1),
+		"i_max": float64(1),
+		"i_min": float64(1),
+		"j_max": float64(1),
+		"j_min": float64(1),
+		"k_max": float64(200),
+		"k_min": float64(200),
+	}
+	expectedTags = map[string]string{
+		"foo": "bar",
+	}
+	acc.AssertContainsTaggedFields(t, "m1", expectedFields, expectedTags)
+}

plugins/aggregators/registry.go

@@ -0,0 +1,11 @@
+package aggregators
+
+import "github.com/influxdata/telegraf"
+
+type Creator func() telegraf.Aggregator
+
+var Aggregators = map[string]Creator{}
+
+func Add(name string, creator Creator) {
+	Aggregators[name] = creator
+}

plugins/all/all.go

@@ -1,8 +0,0 @@
-package all
-
-import (
-	_ "github.com/influxdb/telegraf/plugins/mysql"
-	_ "github.com/influxdb/telegraf/plugins/postgresql"
-	_ "github.com/influxdb/telegraf/plugins/redis"
-	_ "github.com/influxdb/telegraf/plugins/system"
-)

plugins/inputs/EXAMPLE_README.md

@@ -0,0 +1,45 @@
+# Example Input Plugin
+
+The example plugin gathers metrics about example things
+
+### Configuration:
+
+```toml
+# Description
+[[inputs.example]]
+  # SampleConfig
+```
+
+### Measurements & Fields:
+
+<optional description>
+
+- measurement1
+    - field1 (type, unit)
+    - field2 (float, percent)
+- measurement2
+    - field3 (integer, bytes)
+
+### Tags:
+
+- All measurements have the following tags:
+    - tag1 (optional description)
+    - tag2
+- measurement2 has the following tags:
+    - tag3
+    
+### Sample Queries:
+
+These are some useful queries (to generate dashboards or other) to run against data from this plugin:
+
+```
+SELECT max(field1), mean(field1), min(field1) FROM measurement1 WHERE tag1=bar AND time > now() - 1h GROUP BY tag
+```
+
+### Example Output:
+
+```
+$ ./telegraf -config telegraf.conf -input-filter example -test
+measurement1,tag1=foo,tag2=bar field1=1i,field2=2.1 1453831884664956455
+measurement2,tag1=foo,tag2=bar,tag3=baz field3=1i 1453831884664956455
+```

plugins/inputs/aerospike/aerospike.go

@@ -0,0 +1,158 @@
+package aerospike
+
+import (
+	"errors"
+	"log"
+	"net"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/internal/errchan"
+	"github.com/influxdata/telegraf/plugins/inputs"
+
+	as "github.com/aerospike/aerospike-client-go"
+)
+
+type Aerospike struct {
+	Servers []string
+}
+
+var sampleConfig = `
+  ## Aerospike servers to connect to (with port)
+  ## This plugin will query all namespaces the aerospike
+  ## server has configured and get stats for them.
+  servers = ["localhost:3000"]
+ `
+
+func (a *Aerospike) SampleConfig() string {
+	return sampleConfig
+}
+
+func (a *Aerospike) Description() string {
+	return "Read stats from aerospike server(s)"
+}
+
+func (a *Aerospike) Gather(acc telegraf.Accumulator) error {
+	if len(a.Servers) == 0 {
+		return a.gatherServer("127.0.0.1:3000", acc)
+	}
+
+	var wg sync.WaitGroup
+	errChan := errchan.New(len(a.Servers))
+	wg.Add(len(a.Servers))
+	for _, server := range a.Servers {
+		go func(serv string) {
+			defer wg.Done()
+			errChan.C <- a.gatherServer(serv, acc)
+		}(server)
+	}
+
+	wg.Wait()
+	return errChan.Error()
+}
+
+func (a *Aerospike) gatherServer(hostport string, acc telegraf.Accumulator) error {
+	host, port, err := net.SplitHostPort(hostport)
+	if err != nil {
+		return err
+	}
+
+	iport, err := strconv.Atoi(port)
+	if err != nil {
+		iport = 3000
+	}
+
+	c, err := as.NewClient(host, iport)
+	if err != nil {
+		return err
+	}
+	defer c.Close()
+
+	nodes := c.GetNodes()
+	for _, n := range nodes {
+		tags := map[string]string{
+			"aerospike_host": hostport,
+		}
+		fields := map[string]interface{}{
+			"node_name": n.GetName(),
+		}
+		stats, err := as.RequestNodeStats(n)
+		if err != nil {
+			return err
+		}
+		for k, v := range stats {
+			val, err := parseValue(v)
+			if err == nil {
+				fields[strings.Replace(k, "-", "_", -1)] = val
+			} else {
+				log.Printf("I! skipping aerospike field %v with int64 overflow", k)
+			}
+		}
+		acc.AddFields("aerospike_node", fields, tags, time.Now())
+
+		info, err := as.RequestNodeInfo(n, "namespaces")
+		if err != nil {
+			return err
+		}
+		namespaces := strings.Split(info["namespaces"], ";")
+
+		for _, namespace := range namespaces {
+			nTags := map[string]string{
+				"aerospike_host": hostport,
+			}
+			nTags["namespace"] = namespace
+			nFields := map[string]interface{}{
+				"node_name": n.GetName(),
+			}
+			info, err := as.RequestNodeInfo(n, "namespace/"+namespace)
+			if err != nil {
+				continue
+			}
+			stats := strings.Split(info["namespace/"+namespace], ";")
+			for _, stat := range stats {
+				parts := strings.Split(stat, "=")
+				if len(parts) < 2 {
+					continue
+				}
+				val, err := parseValue(parts[1])
+				if err == nil {
+					nFields[strings.Replace(parts[0], "-", "_", -1)] = val
+				} else {
+					log.Printf("I! skipping aerospike field %v with int64 overflow", parts[0])
+				}
+			}
+			acc.AddFields("aerospike_namespace", nFields, nTags, time.Now())
+		}
+	}
+	return nil
+}
+
+func parseValue(v string) (interface{}, error) {
+	if parsed, err := strconv.ParseInt(v, 10, 64); err == nil {
+		return parsed, nil
+	} else if _, err := strconv.ParseUint(v, 10, 64); err == nil {
+		// int64 overflow, yet valid uint64
+		return nil, errors.New("Number is too large")
+	} else if parsed, err := strconv.ParseBool(v); err == nil {
+		return parsed, nil
+	} else {
+		return v, nil
+	}
+}
+
+func copyTags(m map[string]string) map[string]string {
+	out := make(map[string]string)
+	for k, v := range m {
+		out[k] = v
+	}
+	return out
+}
+
+func init() {
+	inputs.Add("aerospike", func() telegraf.Input {
+		return &Aerospike{}
+	})
+}

plugins/inputs/aerospike/aerospike_test.go

@@ -0,0 +1,67 @@
+package aerospike
+
+import (
+	"testing"
+
+	"github.com/influxdata/telegraf/testutil"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestAerospikeStatistics(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping aerospike integration tests.")
+	}
+
+	a := &Aerospike{
+		Servers: []string{testutil.GetLocalHost() + ":3000"},
+	}
+
+	var acc testutil.Accumulator
+
+	err := a.Gather(&acc)
+	require.NoError(t, err)
+
+	assert.True(t, acc.HasMeasurement("aerospike_node"))
+	assert.True(t, acc.HasMeasurement("aerospike_namespace"))
+	assert.True(t, acc.HasIntField("aerospike_node", "batch_error"))
+}
+
+func TestAerospikeStatisticsPartialErr(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping aerospike integration tests.")
+	}
+
+	a := &Aerospike{
+		Servers: []string{
+			testutil.GetLocalHost() + ":3000",
+			testutil.GetLocalHost() + ":9999",
+		},
+	}
+
+	var acc testutil.Accumulator
+
+	err := a.Gather(&acc)
+	require.Error(t, err)
+
+	assert.True(t, acc.HasMeasurement("aerospike_node"))
+	assert.True(t, acc.HasMeasurement("aerospike_namespace"))
+	assert.True(t, acc.HasIntField("aerospike_node", "batch_error"))
+}
+
+func TestAerospikeParseValue(t *testing.T) {
+	// uint64 with value bigger than int64 max
+	val, err := parseValue("18446744041841121751")
+	assert.Nil(t, val)
+	assert.Error(t, err)
+
+	// int values
+	val, err = parseValue("42")
+	assert.NoError(t, err)
+	assert.Equal(t, val, int64(42), "must be parsed as int")
+
+	// string values
+	val, err = parseValue("BB977942A2CA502")
+	assert.NoError(t, err)
+	assert.Equal(t, val, `BB977942A2CA502`, "must be left as string")
+}

plugins/inputs/all/all.go

@@ -0,0 +1,84 @@
+package all
+
+import (
+	_ "github.com/influxdata/telegraf/plugins/inputs/aerospike"
+	_ "github.com/influxdata/telegraf/plugins/inputs/apache"
+	_ "github.com/influxdata/telegraf/plugins/inputs/bcache"
+	_ "github.com/influxdata/telegraf/plugins/inputs/cassandra"
+	_ "github.com/influxdata/telegraf/plugins/inputs/ceph"
+	_ "github.com/influxdata/telegraf/plugins/inputs/cgroup"
+	_ "github.com/influxdata/telegraf/plugins/inputs/chrony"
+	_ "github.com/influxdata/telegraf/plugins/inputs/cloudwatch"
+	_ "github.com/influxdata/telegraf/plugins/inputs/conntrack"
+	_ "github.com/influxdata/telegraf/plugins/inputs/consul"
+	_ "github.com/influxdata/telegraf/plugins/inputs/couchbase"
+	_ "github.com/influxdata/telegraf/plugins/inputs/couchdb"
+	_ "github.com/influxdata/telegraf/plugins/inputs/disque"
+	_ "github.com/influxdata/telegraf/plugins/inputs/dns_query"
+	_ "github.com/influxdata/telegraf/plugins/inputs/docker"
+	_ "github.com/influxdata/telegraf/plugins/inputs/dovecot"
+	_ "github.com/influxdata/telegraf/plugins/inputs/elasticsearch"
+	_ "github.com/influxdata/telegraf/plugins/inputs/exec"
+	_ "github.com/influxdata/telegraf/plugins/inputs/filestat"
+	_ "github.com/influxdata/telegraf/plugins/inputs/graylog"
+	_ "github.com/influxdata/telegraf/plugins/inputs/haproxy"
+	_ "github.com/influxdata/telegraf/plugins/inputs/hddtemp"
+	_ "github.com/influxdata/telegraf/plugins/inputs/http_listener"
+	_ "github.com/influxdata/telegraf/plugins/inputs/http_response"
+	_ "github.com/influxdata/telegraf/plugins/inputs/httpjson"
+	_ "github.com/influxdata/telegraf/plugins/inputs/influxdb"
+	_ "github.com/influxdata/telegraf/plugins/inputs/internal"
+	_ "github.com/influxdata/telegraf/plugins/inputs/ipmi_sensor"
+	_ "github.com/influxdata/telegraf/plugins/inputs/iptables"
+	_ "github.com/influxdata/telegraf/plugins/inputs/jolokia"
+	_ "github.com/influxdata/telegraf/plugins/inputs/kafka_consumer"
+	_ "github.com/influxdata/telegraf/plugins/inputs/kubernetes"
+	_ "github.com/influxdata/telegraf/plugins/inputs/leofs"
+	_ "github.com/influxdata/telegraf/plugins/inputs/logparser"
+	_ "github.com/influxdata/telegraf/plugins/inputs/lustre2"
+	_ "github.com/influxdata/telegraf/plugins/inputs/mailchimp"
+	_ "github.com/influxdata/telegraf/plugins/inputs/memcached"
+	_ "github.com/influxdata/telegraf/plugins/inputs/mesos"
+	_ "github.com/influxdata/telegraf/plugins/inputs/mongodb"
+	_ "github.com/influxdata/telegraf/plugins/inputs/mqtt_consumer"
+	_ "github.com/influxdata/telegraf/plugins/inputs/mysql"
+	_ "github.com/influxdata/telegraf/plugins/inputs/nats_consumer"
+	_ "github.com/influxdata/telegraf/plugins/inputs/net_response"
+	_ "github.com/influxdata/telegraf/plugins/inputs/nginx"
+	_ "github.com/influxdata/telegraf/plugins/inputs/nsq"
+	_ "github.com/influxdata/telegraf/plugins/inputs/nsq_consumer"
+	_ "github.com/influxdata/telegraf/plugins/inputs/nstat"
+	_ "github.com/influxdata/telegraf/plugins/inputs/ntpq"
+	_ "github.com/influxdata/telegraf/plugins/inputs/passenger"
+	_ "github.com/influxdata/telegraf/plugins/inputs/phpfpm"
+	_ "github.com/influxdata/telegraf/plugins/inputs/ping"
+	_ "github.com/influxdata/telegraf/plugins/inputs/postgresql"
+	_ "github.com/influxdata/telegraf/plugins/inputs/postgresql_extensible"
+	_ "github.com/influxdata/telegraf/plugins/inputs/powerdns"
+	_ "github.com/influxdata/telegraf/plugins/inputs/procstat"
+	_ "github.com/influxdata/telegraf/plugins/inputs/prometheus"
+	_ "github.com/influxdata/telegraf/plugins/inputs/puppetagent"
+	_ "github.com/influxdata/telegraf/plugins/inputs/rabbitmq"
+	_ "github.com/influxdata/telegraf/plugins/inputs/raindrops"
+	_ "github.com/influxdata/telegraf/plugins/inputs/redis"
+	_ "github.com/influxdata/telegraf/plugins/inputs/rethinkdb"
+	_ "github.com/influxdata/telegraf/plugins/inputs/riak"
+	_ "github.com/influxdata/telegraf/plugins/inputs/sensors"
+	_ "github.com/influxdata/telegraf/plugins/inputs/snmp"
+	_ "github.com/influxdata/telegraf/plugins/inputs/snmp_legacy"
+	_ "github.com/influxdata/telegraf/plugins/inputs/sqlserver"
+	_ "github.com/influxdata/telegraf/plugins/inputs/statsd"
+	_ "github.com/influxdata/telegraf/plugins/inputs/sysstat"
+	_ "github.com/influxdata/telegraf/plugins/inputs/system"
+	_ "github.com/influxdata/telegraf/plugins/inputs/tail"
+	_ "github.com/influxdata/telegraf/plugins/inputs/tcp_listener"
+	_ "github.com/influxdata/telegraf/plugins/inputs/trig"
+	_ "github.com/influxdata/telegraf/plugins/inputs/twemproxy"
+	_ "github.com/influxdata/telegraf/plugins/inputs/udp_listener"
+	_ "github.com/influxdata/telegraf/plugins/inputs/usgs"
+	_ "github.com/influxdata/telegraf/plugins/inputs/varnish"
+	_ "github.com/influxdata/telegraf/plugins/inputs/webhooks"
+	_ "github.com/influxdata/telegraf/plugins/inputs/win_perf_counters"
+	_ "github.com/influxdata/telegraf/plugins/inputs/zfs"
+	_ "github.com/influxdata/telegraf/plugins/inputs/zookeeper"
+)

plugins/inputs/apache/README.md

@@ -0,0 +1,55 @@
+# Telegraf plugin: Apache
+
+#### Plugin arguments:
+- **urls** []string: List of apache-status URLs to collect from. Default is "http://localhost/server-status?auto".
+- **username** string: Username for HTTP basic authentication
+- **password** string: Password for HTTP basic authentication
+- **timeout** duration: time that the HTTP connection will remain waiting for response. Defalt 4 seconds ("4s")
+
+##### Optional SSL Config
+
+- **ssl_ca** string: the full path for the SSL CA certicate
+- **ssl_cert** string: the full path for the SSL certificate
+- **ssl_key** string: the full path for the key file
+- **insecure_skip_verify** bool: if true HTTP client will skip all SSL verifications related to peer and host. Default to false
+
+#### Description
+
+The Apache plugin collects from the /server-status?auto URL. See
+[apache.org/server-status?auto](http://www.apache.org/server-status?auto) for an
+example. And
+[here](http://httpd.apache.org/docs/2.2/mod/mod_status.html) for the apache
+mod_status documentation.
+
+# Measurements:
+
+Meta:
+- tags: `port=<port>`, `server=url`
+
+- apache_TotalAccesses
+- apache_TotalkBytes
+- apache_CPULoad
+- apache_Uptime
+- apache_ReqPerSec
+- apache_BytesPerSec
+- apache_BytesPerReq
+- apache_BusyWorkers
+- apache_IdleWorkers
+- apache_ConnsTotal
+- apache_ConnsAsyncWriting
+- apache_ConnsAsyncKeepAlive
+- apache_ConnsAsyncClosing
+
+### Scoreboard measurements
+
+- apache_scboard_waiting
+- apache_scboard_starting
+- apache_scboard_reading
+- apache_scboard_sending
+- apache_scboard_keepalive
+- apache_scboard_dnslookup
+- apache_scboard_closing
+- apache_scboard_logging
+- apache_scboard_finishing
+- apache_scboard_idle_cleanup
+- apache_scboard_open

plugins/inputs/apache/apache.go

@@ -0,0 +1,234 @@
+package apache
+
+import (
+	"bufio"
+	"fmt"
+	"net"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/internal"
+	"github.com/influxdata/telegraf/plugins/inputs"
+)
+
+type Apache struct {
+	Urls            []string
+	Username        string
+	Password        string
+	ResponseTimeout internal.Duration
+	// Path to CA file
+	SSLCA string `toml:"ssl_ca"`
+	// Path to host cert file
+	SSLCert string `toml:"ssl_cert"`
+	// Path to cert key file
+	SSLKey string `toml:"ssl_key"`
+	// Use SSL but skip chain & host verification
+	InsecureSkipVerify bool
+}
+
+var sampleConfig = `
+  ## An array of Apache status URI to gather stats.
+  ## Default is "http://localhost/server-status?auto".
+  urls = ["http://localhost/server-status?auto"]
+  ## user credentials for basic HTTP authentication
+  username = "myuser"
+  password = "mypassword"
+
+  ## Timeout to the complete conection and reponse time in seconds
+  response_timeout = "25s" ## default to 5 seconds
+
+  ## Optional SSL Config
+  # ssl_ca = "/etc/telegraf/ca.pem"
+  # ssl_cert = "/etc/telegraf/cert.pem"
+  # ssl_key = "/etc/telegraf/key.pem"
+  ## Use SSL but skip chain & host verification
+  # insecure_skip_verify = false
+`
+
+func (n *Apache) SampleConfig() string {
+	return sampleConfig
+}
+
+func (n *Apache) Description() string {
+	return "Read Apache status information (mod_status)"
+}
+
+func (n *Apache) Gather(acc telegraf.Accumulator) error {
+	if len(n.Urls) == 0 {
+		n.Urls = []string{"http://localhost/server-status?auto"}
+	}
+	if n.ResponseTimeout.Duration < time.Second {
+		n.ResponseTimeout.Duration = time.Second * 5
+	}
+
+	var outerr error
+	var errch = make(chan error)
+
+	for _, u := range n.Urls {
+		addr, err := url.Parse(u)
+		if err != nil {
+			return fmt.Errorf("Unable to parse address '%s': %s", u, err)
+		}
+
+		go func(addr *url.URL) {
+			errch <- n.gatherUrl(addr, acc)
+		}(addr)
+	}
+
+	// Drain channel, waiting for all requests to finish and save last error.
+	for range n.Urls {
+		if err := <-errch; err != nil {
+			outerr = err
+		}
+	}
+
+	return outerr
+}
+
+func (n *Apache) gatherUrl(addr *url.URL, acc telegraf.Accumulator) error {
+
+	var tr *http.Transport
+
+	if addr.Scheme == "https" {
+		tlsCfg, err := internal.GetTLSConfig(
+			n.SSLCert, n.SSLKey, n.SSLCA, n.InsecureSkipVerify)
+		if err != nil {
+			return err
+		}
+		tr = &http.Transport{
+			ResponseHeaderTimeout: time.Duration(3 * time.Second),
+			TLSClientConfig:       tlsCfg,
+		}
+	} else {
+		tr = &http.Transport{
+			ResponseHeaderTimeout: time.Duration(3 * time.Second),
+		}
+	}
+
+	client := &http.Client{
+		Transport: tr,
+		Timeout:   n.ResponseTimeout.Duration,
+	}
+
+	req, err := http.NewRequest("GET", addr.String(), nil)
+	if err != nil {
+		return fmt.Errorf("error on new request to %s : %s\n", addr.String(), err)
+	}
+
+	if len(n.Username) != 0 && len(n.Password) != 0 {
+		req.SetBasicAuth(n.Username, n.Password)
+	}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return fmt.Errorf("error on request to %s : %s\n", addr.String(), err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("%s returned HTTP status %s", addr.String(), resp.Status)
+	}
+
+	tags := getTags(addr)
+
+	sc := bufio.NewScanner(resp.Body)
+	fields := make(map[string]interface{})
+	for sc.Scan() {
+		line := sc.Text()
+		if strings.Contains(line, ":") {
+			parts := strings.SplitN(line, ":", 2)
+			key, part := strings.Replace(parts[0], " ", "", -1), strings.TrimSpace(parts[1])
+
+			switch key {
+			case "Scoreboard":
+				for field, value := range n.gatherScores(part) {
+					fields[field] = value
+				}
+			default:
+				value, err := strconv.ParseFloat(part, 64)
+				if err != nil {
+					continue
+				}
+				fields[key] = value
+			}
+		}
+	}
+	acc.AddFields("apache", fields, tags)
+
+	return nil
+}
+
+func (n *Apache) gatherScores(data string) map[string]interface{} {
+	var waiting, open int = 0, 0
+	var S, R, W, K, D, C, L, G, I int = 0, 0, 0, 0, 0, 0, 0, 0, 0
+
+	for _, s := range strings.Split(data, "") {
+
+		switch s {
+		case "_":
+			waiting++
+		case "S":
+			S++
+		case "R":
+			R++
+		case "W":
+			W++
+		case "K":
+			K++
+		case "D":
+			D++
+		case "C":
+			C++
+		case "L":
+			L++
+		case "G":
+			G++
+		case "I":
+			I++
+		case ".":
+			open++
+		}
+	}
+
+	fields := map[string]interface{}{
+		"scboard_waiting":      float64(waiting),
+		"scboard_starting":     float64(S),
+		"scboard_reading":      float64(R),
+		"scboard_sending":      float64(W),
+		"scboard_keepalive":    float64(K),
+		"scboard_dnslookup":    float64(D),
+		"scboard_closing":      float64(C),
+		"scboard_logging":      float64(L),
+		"scboard_finishing":    float64(G),
+		"scboard_idle_cleanup": float64(I),
+		"scboard_open":         float64(open),
+	}
+	return fields
+}
+
+// Get tag(s) for the apache plugin
+func getTags(addr *url.URL) map[string]string {
+	h := addr.Host
+	host, port, err := net.SplitHostPort(h)
+	if err != nil {
+		host = addr.Host
+		if addr.Scheme == "http" {
+			port = "80"
+		} else if addr.Scheme == "https" {
+			port = "443"
+		} else {
+			port = ""
+		}
+	}
+	return map[string]string{"server": host, "port": port}
+}
+
+func init() {
+	inputs.Add("apache", func() telegraf.Input {
+		return &Apache{}
+	})
+}

plugins/inputs/apache/apache_test.go

@@ -0,0 +1,74 @@
+package apache
+
+import (
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/influxdata/telegraf/testutil"
+
+	"github.com/stretchr/testify/require"
+)
+
+var apacheStatus = `
+Total Accesses: 129811861
+Total kBytes: 5213701865
+CPULoad: 6.51929
+Uptime: 941553
+ReqPerSec: 137.87
+BytesPerSec: 5670240
+BytesPerReq: 41127.4
+BusyWorkers: 270
+IdleWorkers: 630
+ConnsTotal: 1451
+ConnsAsyncWriting: 32
+ConnsAsyncKeepAlive: 945
+ConnsAsyncClosing: 205
+Scoreboard: WW_____W_RW_R_W__RRR____WR_W___WW________W_WW_W_____R__R_WR__WRWR_RRRW___R_RWW__WWWRW__R_RW___RR_RW_R__W__WR_WWW______WWR__R___R_WR_W___RW______RR________________W______R__RR______W________________R____R__________________________RW_W____R_____W_R_________________R____RR__W___R_R____RW______R____W______W_W_R_R______R__R_R__________R____W_______WW____W____RR__W_____W_R_______W__________W___W____________W_______WRR_R_W____W_____R____W_WW_R____RRW__W............................................................................................................................................................................................................................................................................................................WRRWR____WR__RR_R___RWR_________W_R____RWRRR____R_R__RW_R___WWW_RW__WR_RRR____W___R____WW_R__R___RR_W_W_RRRRWR__RRWR__RRW_W_RRRW_R_RR_W__RR_RWRR_R__R___RR_RR______R__RR____R_____W_R_R_R__R__R__________W____WW_R___R_R___R_________RR__RR____RWWWW___W_R________R_R____R_W___W___R___W_WRRWW_______R__W_RW_______R________RR__R________W_______________________W_W______________RW_________WR__R___R__R_______________WR_R_________W___RW_____R____________W____......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
+`
+
+func TestHTTPApache(t *testing.T) {
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		fmt.Fprintln(w, apacheStatus)
+	}))
+	defer ts.Close()
+
+	a := Apache{
+		// Fetch it 2 times to catch possible data races.
+		Urls: []string{ts.URL, ts.URL},
+	}
+
+	var acc testutil.Accumulator
+	err := a.Gather(&acc)
+	require.NoError(t, err)
+
+	fields := map[string]interface{}{
+		"TotalAccesses":        float64(1.29811861e+08),
+		"TotalkBytes":          float64(5.213701865e+09),
+		"CPULoad":              float64(6.51929),
+		"Uptime":               float64(941553),
+		"ReqPerSec":            float64(137.87),
+		"BytesPerSec":          float64(5.67024e+06),
+		"BytesPerReq":          float64(41127.4),
+		"BusyWorkers":          float64(270),
+		"IdleWorkers":          float64(630),
+		"ConnsTotal":           float64(1451),
+		"ConnsAsyncWriting":    float64(32),
+		"ConnsAsyncKeepAlive":  float64(945),
+		"ConnsAsyncClosing":    float64(205),
+		"scboard_waiting":      float64(630),
+		"scboard_starting":     float64(0),
+		"scboard_reading":      float64(157),
+		"scboard_sending":      float64(113),
+		"scboard_keepalive":    float64(0),
+		"scboard_dnslookup":    float64(0),
+		"scboard_closing":      float64(0),
+		"scboard_logging":      float64(0),
+		"scboard_finishing":    float64(0),
+		"scboard_idle_cleanup": float64(0),
+		"scboard_open":         float64(2850),
+	}
+	acc.AssertContainsFields(t, "apache", fields)
+}

plugins/inputs/bcache/README.md

@@ -0,0 +1,89 @@
+# Telegraf plugin: bcache
+
+Get bcache stat from stats_total directory and dirty_data file.
+
+# Measurements
+
+Meta:
+
+- tags: `backing_dev=dev bcache_dev=dev`
+
+Measurement names:
+
+- dirty_data
+- bypassed
+- cache_bypass_hits
+- cache_bypass_misses
+- cache_hit_ratio
+- cache_hits
+- cache_miss_collisions
+- cache_misses
+- cache_readaheads
+
+### Description
+
+```
+dirty_data
+  Amount of dirty data for this backing device in the cache. Continuously
+  updated unlike the cache set's version, but may be slightly off.
+
+bypassed
+  Amount of IO (both reads and writes) that has bypassed the cache
+
+
+cache_bypass_hits
+cache_bypass_misses
+  Hits and misses for IO that is intended to skip the cache are still counted,
+  but broken out here.
+
+cache_hits
+cache_misses
+cache_hit_ratio
+  Hits and misses are counted per individual IO as bcache sees them; a
+  partial hit is counted as a miss.
+
+cache_miss_collisions
+  Counts instances where data was going to be inserted into the cache from a
+  cache miss, but raced with a write and data was already present (usually 0
+  since the synchronization for cache misses was rewritten)
+
+cache_readaheads
+  Count of times readahead occurred.
+```
+
+# Example output
+
+Using this configuration:
+
+```
+[bcache]
+  # Bcache sets path
+  # If not specified, then default is:
+  # bcachePath = "/sys/fs/bcache"
+  #
+  # By default, telegraf gather stats for all bcache devices
+  # Setting devices will restrict the stats to the specified
+  # bcache devices.
+  # bcacheDevs = ["bcache0", ...]
+```
+
+When run with:
+
+```
+./telegraf -config telegraf.conf -input-filter bcache -test
+```
+
+It produces:
+
+```
+* Plugin: bcache, Collection 1
+> [backing_dev="md10" bcache_dev="bcache0"] bcache_dirty_data value=11639194
+> [backing_dev="md10" bcache_dev="bcache0"] bcache_bypassed value=5167704440832
+> [backing_dev="md10" bcache_dev="bcache0"] bcache_cache_bypass_hits value=146270986
+> [backing_dev="md10" bcache_dev="bcache0"] bcache_cache_bypass_misses value=0
+> [backing_dev="md10" bcache_dev="bcache0"] bcache_cache_hit_ratio value=90
+> [backing_dev="md10" bcache_dev="bcache0"] bcache_cache_hits value=511941651
+> [backing_dev="md10" bcache_dev="bcache0"] bcache_cache_miss_collisions value=157678
+> [backing_dev="md10" bcache_dev="bcache0"] bcache_cache_misses value=50647396
+> [backing_dev="md10" bcache_dev="bcache0"] bcache_cache_readaheads value=0
+```

plugins/inputs/bcache/bcache.go

@@ -0,0 +1,142 @@
+package bcache
+
+import (
+	"errors"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/inputs"
+)
+
+type Bcache struct {
+	BcachePath string
+	BcacheDevs []string
+}
+
+var sampleConfig = `
+  ## Bcache sets path
+  ## If not specified, then default is:
+  bcachePath = "/sys/fs/bcache"
+
+  ## By default, telegraf gather stats for all bcache devices
+  ## Setting devices will restrict the stats to the specified
+  ## bcache devices.
+  bcacheDevs = ["bcache0"]
+`
+
+func (b *Bcache) SampleConfig() string {
+	return sampleConfig
+}
+
+func (b *Bcache) Description() string {
+	return "Read metrics of bcache from stats_total and dirty_data"
+}
+
+func getTags(bdev string) map[string]string {
+	backingDevFile, _ := os.Readlink(bdev)
+	backingDevPath := strings.Split(backingDevFile, "/")
+	backingDev := backingDevPath[len(backingDevPath)-2]
+
+	bcacheDevFile, _ := os.Readlink(bdev + "/dev")
+	bcacheDevPath := strings.Split(bcacheDevFile, "/")
+	bcacheDev := bcacheDevPath[len(bcacheDevPath)-1]
+
+	return map[string]string{"backing_dev": backingDev, "bcache_dev": bcacheDev}
+}
+
+func prettyToBytes(v string) uint64 {
+	var factors = map[string]uint64{
+		"k": 1 << 10,
+		"M": 1 << 20,
+		"G": 1 << 30,
+		"T": 1 << 40,
+		"P": 1 << 50,
+		"E": 1 << 60,
+	}
+	var factor uint64
+	factor = 1
+	prefix := v[len(v)-1 : len(v)]
+	if factors[prefix] != 0 {
+		v = v[:len(v)-1]
+		factor = factors[prefix]
+	}
+	result, _ := strconv.ParseFloat(v, 32)
+	result = result * float64(factor)
+
+	return uint64(result)
+}
+
+func (b *Bcache) gatherBcache(bdev string, acc telegraf.Accumulator) error {
+	tags := getTags(bdev)
+	metrics, err := filepath.Glob(bdev + "/stats_total/*")
+	if len(metrics) < 0 {
+		return errors.New("Can't read any stats file")
+	}
+	file, err := ioutil.ReadFile(bdev + "/dirty_data")
+	if err != nil {
+		return err
+	}
+	rawValue := strings.TrimSpace(string(file))
+	value := prettyToBytes(rawValue)
+
+	fields := make(map[string]interface{})
+	fields["dirty_data"] = value
+
+	for _, path := range metrics {
+		key := filepath.Base(path)
+		file, err := ioutil.ReadFile(path)
+		rawValue := strings.TrimSpace(string(file))
+		if err != nil {
+			return err
+		}
+		if key == "bypassed" {
+			value := prettyToBytes(rawValue)
+			fields[key] = value
+		} else {
+			value, _ := strconv.ParseUint(rawValue, 10, 64)
+			fields[key] = value
+		}
+	}
+	acc.AddFields("bcache", fields, tags)
+	return nil
+}
+
+func (b *Bcache) Gather(acc telegraf.Accumulator) error {
+	bcacheDevsChecked := make(map[string]bool)
+	var restrictDevs bool
+	if len(b.BcacheDevs) != 0 {
+		restrictDevs = true
+		for _, bcacheDev := range b.BcacheDevs {
+			bcacheDevsChecked[bcacheDev] = true
+		}
+	}
+
+	bcachePath := b.BcachePath
+	if len(bcachePath) == 0 {
+		bcachePath = "/sys/fs/bcache"
+	}
+	bdevs, _ := filepath.Glob(bcachePath + "/*/bdev*")
+	if len(bdevs) < 1 {
+		return errors.New("Can't find any bcache device")
+	}
+	for _, bdev := range bdevs {
+		if restrictDevs {
+			bcacheDev := getTags(bdev)["bcache_dev"]
+			if !bcacheDevsChecked[bcacheDev] {
+				continue
+			}
+		}
+		b.gatherBcache(bdev, acc)
+	}
+	return nil
+}
+
+func init() {
+	inputs.Add("bcache", func() telegraf.Input {
+		return &Bcache{}
+	})
+}

plugins/inputs/bcache/bcache_test.go

@@ -0,0 +1,121 @@
+package bcache
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"github.com/influxdata/telegraf/testutil"
+	"github.com/stretchr/testify/require"
+)
+
+const (
+	dirty_data            = "1.5G"
+	bypassed              = "4.7T"
+	cache_bypass_hits     = "146155333"
+	cache_bypass_misses   = "0"
+	cache_hit_ratio       = "90"
+	cache_hits            = "511469583"
+	cache_miss_collisions = "157567"
+	cache_misses          = "50616331"
+	cache_readaheads      = "2"
+)
+
+var (
+	testBcachePath           = os.TempDir() + "/telegraf/sys/fs/bcache"
+	testBcacheUuidPath       = testBcachePath + "/663955a3-765a-4737-a9fd-8250a7a78411"
+	testBcacheDevPath        = os.TempDir() + "/telegraf/sys/devices/virtual/block/bcache0"
+	testBcacheBackingDevPath = os.TempDir() + "/telegraf/sys/devices/virtual/block/md10"
+)
+
+func TestBcacheGeneratesMetrics(t *testing.T) {
+	err := os.MkdirAll(testBcacheUuidPath, 0755)
+	require.NoError(t, err)
+
+	err = os.MkdirAll(testBcacheDevPath, 0755)
+	require.NoError(t, err)
+
+	err = os.MkdirAll(testBcacheBackingDevPath+"/bcache", 0755)
+	require.NoError(t, err)
+
+	err = os.Symlink(testBcacheBackingDevPath+"/bcache", testBcacheUuidPath+"/bdev0")
+	require.NoError(t, err)
+
+	err = os.Symlink(testBcacheDevPath, testBcacheUuidPath+"/bdev0/dev")
+	require.NoError(t, err)
+
+	err = os.MkdirAll(testBcacheUuidPath+"/bdev0/stats_total", 0755)
+	require.NoError(t, err)
+
+	err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/dirty_data",
+		[]byte(dirty_data), 0644)
+	require.NoError(t, err)
+
+	err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/stats_total/bypassed",
+		[]byte(bypassed), 0644)
+	require.NoError(t, err)
+
+	err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/stats_total/cache_bypass_hits",
+		[]byte(cache_bypass_hits), 0644)
+	require.NoError(t, err)
+
+	err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/stats_total/cache_bypass_misses",
+		[]byte(cache_bypass_misses), 0644)
+	require.NoError(t, err)
+
+	err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/stats_total/cache_hit_ratio",
+		[]byte(cache_hit_ratio), 0644)
+	require.NoError(t, err)
+
+	err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/stats_total/cache_hits",
+		[]byte(cache_hits), 0644)
+	require.NoError(t, err)
+
+	err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/stats_total/cache_miss_collisions",
+		[]byte(cache_miss_collisions), 0644)
+	require.NoError(t, err)
+
+	err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/stats_total/cache_misses",
+		[]byte(cache_misses), 0644)
+	require.NoError(t, err)
+
+	err = ioutil.WriteFile(testBcacheUuidPath+"/bdev0/stats_total/cache_readaheads",
+		[]byte(cache_readaheads), 0644)
+	require.NoError(t, err)
+
+	fields := map[string]interface{}{
+		"dirty_data":            uint64(1610612736),
+		"bypassed":              uint64(5167704440832),
+		"cache_bypass_hits":     uint64(146155333),
+		"cache_bypass_misses":   uint64(0),
+		"cache_hit_ratio":       uint64(90),
+		"cache_hits":            uint64(511469583),
+		"cache_miss_collisions": uint64(157567),
+		"cache_misses":          uint64(50616331),
+		"cache_readaheads":      uint64(2),
+	}
+
+	tags := map[string]string{
+		"backing_dev": "md10",
+		"bcache_dev":  "bcache0",
+	}
+
+	var acc testutil.Accumulator
+
+	// all devs
+	b := &Bcache{BcachePath: testBcachePath}
+
+	err = b.Gather(&acc)
+	require.NoError(t, err)
+	acc.AssertContainsTaggedFields(t, "bcache", fields, tags)
+
+	// one exist dev
+	b = &Bcache{BcachePath: testBcachePath, BcacheDevs: []string{"bcache0"}}
+
+	err = b.Gather(&acc)
+	require.NoError(t, err)
+	acc.AssertContainsTaggedFields(t, "bcache", fields, tags)
+
+	err = os.RemoveAll(os.TempDir() + "/telegraf")
+	require.NoError(t, err)
+}

plugins/inputs/cassandra/README.md

@@ -0,0 +1,125 @@
+# Telegraf plugin: Cassandra
+
+#### Plugin arguments:
+- **context** string: Context root used for jolokia url
+- **servers** []string: List of servers with the format "<user:passwd@><host>:port"
+- **metrics** []string: List of Jmx paths that identify mbeans attributes
+
+#### Description
+
+The Cassandra plugin collects Cassandra 3 / JVM metrics exposed as MBean's attributes through jolokia REST endpoint. All metrics are collected for each server configured.
+
+See: https://jolokia.org/ and [Cassandra Documentation](http://docs.datastax.com/en/cassandra/3.x/cassandra/operations/monitoringCassandraTOC.html)
+
+# Measurements:
+Cassandra plugin produces one or more measurements for each metric configured, adding Server's name  as `host` tag. More than one measurement is generated when querying table metrics with a wildcard for the keyspace or table name.
+
+Given a configuration like:
+
+```toml
+[[inputs.cassandra]]
+  context = "/jolokia/read"
+  servers = [":8778"]
+  metrics = ["/java.lang:type=Memory/HeapMemoryUsage"]
+```
+
+The collected metrics will be:
+
+```
+javaMemory,host=myHost,mname=HeapMemoryUsage HeapMemoryUsage_committed=1040187392,HeapMemoryUsage_init=1050673152,HeapMemoryUsage_max=1040187392,HeapMemoryUsage_used=368155000 1459551767230567084
+```
+
+# Useful Metrics:
+
+Here is a list of metrics that might be useful to monitor your cassandra cluster. This was put together from multiple sources on the web.
+
+- [How to monitor Cassandra performance metrics](https://www.datadoghq.com/blog/how-to-monitor-cassandra-performance-metrics)
+- [Cassandra Documentation](http://docs.datastax.com/en/cassandra/3.x/cassandra/operations/monitoringCassandraTOC.html)
+
+####measurement = javaGarbageCollector
+
+- /java.lang:type=GarbageCollector,name=ConcurrentMarkSweep/CollectionTime
+- /java.lang:type=GarbageCollector,name=ConcurrentMarkSweep/CollectionCount
+- /java.lang:type=GarbageCollector,name=ParNew/CollectionTime
+- /java.lang:type=GarbageCollector,name=ParNew/CollectionCount
+
+####measurement = javaMemory
+
+- /java.lang:type=Memory/HeapMemoryUsage
+- /java.lang:type=Memory/NonHeapMemoryUsage
+
+####measurement = cassandraCache
+
+- /org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Hits
+- /org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Requests
+- /org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Entries
+- /org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Size
+- /org.apache.cassandra.metrics:type=Cache,scope=KeyCache,name=Capacity
+- /org.apache.cassandra.metrics:type=Cache,scope=RowCache,name=Hits
+- /org.apache.cassandra.metrics:type=Cache,scope=RowCache,name=Requests
+- /org.apache.cassandra.metrics:type=Cache,scope=RowCache,name=Entries
+- /org.apache.cassandra.metrics:type=Cache,scope=RowCache,name=Size
+- /org.apache.cassandra.metrics:type=Cache,scope=RowCache,name=Capacity
+
+####measurement = cassandraClient
+
+- /org.apache.cassandra.metrics:type=Client,name=connectedNativeClients
+
+####measurement = cassandraClientRequest
+
+- /org.apache.cassandra.metrics:type=ClientRequest,scope=Read,name=TotalLatency
+- /org.apache.cassandra.metrics:type=ClientRequest,scope=Write,name=TotalLatency
+- /org.apache.cassandra.metrics:type=ClientRequest,scope=Read,name=Latency
+- /org.apache.cassandra.metrics:type=ClientRequest,scope=Write,name=Latency
+- /org.apache.cassandra.metrics:type=ClientRequest,scope=Read,name=Timeouts
+- /org.apache.cassandra.metrics:type=ClientRequest,scope=Write,name=Timeouts
+- /org.apache.cassandra.metrics:type=ClientRequest,scope=Read,name=Unavailables
+- /org.apache.cassandra.metrics:type=ClientRequest,scope=Write,name=Unavailables
+- /org.apache.cassandra.metrics:type=ClientRequest,scope=Read,name=Failures
+- /org.apache.cassandra.metrics:type=ClientRequest,scope=Write,name=Failures
+
+####measurement = cassandraCommitLog
+
+- /org.apache.cassandra.metrics:type=CommitLog,name=PendingTasks
+- /org.apache.cassandra.metrics:type=CommitLog,name=TotalCommitLogSize
+
+####measurement = cassandraCompaction
+
+- /org.apache.cassandra.metrics:type=Compaction,name=CompletedTasks
+- /org.apache.cassandra.metrics:type=Compaction,name=PendingTasks
+- /org.apache.cassandra.metrics:type=Compaction,name=TotalCompactionsCompleted
+- /org.apache.cassandra.metrics:type=Compaction,name=BytesCompacted
+
+####measurement = cassandraStorage
+
+- /org.apache.cassandra.metrics:type=Storage,name=Load
+-  /org.apache.cassandra.metrics:type=Storage,name=Exceptions
+
+####measurement = cassandraTable
+Using wildcards for "keyspace" and "scope" can create a lot of series as metrics will be reported for every table and keyspace including internal system tables. Specify a keyspace name and/or a table name to limit them.
+
+- /org.apache.cassandra.metrics:type=Table,keyspace=\*,scope=\*,name=LiveDiskSpaceUsed
+- /org.apache.cassandra.metrics:type=Table,keyspace=\*,scope=\*,name=TotalDiskSpaceUsed
+- /org.apache.cassandra.metrics:type=Table,keyspace=\*,scope=\*,name=ReadLatency
+- /org.apache.cassandra.metrics:type=Table,keyspace=\*,scope=\*,name=CoordinatorReadLatency
+- /org.apache.cassandra.metrics:type=Table,keyspace=\*,scope=\*,name=WriteLatency
+- /org.apache.cassandra.metrics:type=Table,keyspace=\*,scope=\*,name=ReadTotalLatency
+- /org.apache.cassandra.metrics:type=Table,keyspace=\*,scope=\*,name=WriteTotalLatency
+
+
+####measurement = cassandraThreadPools
+
+- /org.apache.cassandra.metrics:type=ThreadPools,path=internal,scope=CompactionExecutor,name=ActiveTasks
+- /org.apache.cassandra.metrics:type=ThreadPools,path=internal,scope=AntiEntropyStage,name=ActiveTasks
+-  /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=CounterMutationStage,name=PendingTasks
+- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=CounterMutationStage,name=CurrentlyBlockedTasks        
+- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=MutationStage,name=PendingTasks
+- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=MutationStage,name=CurrentlyBlockedTasks
+- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=ReadRepairStage,name=PendingTasks
+- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=ReadRepairStage,name=CurrentlyBlockedTasks
+- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=ReadStage,name=PendingTasks
+- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=ReadStage,name=CurrentlyBlockedTasks
+-  /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=RequestResponseStage,name=PendingTasks        
+- /org.apache.cassandra.metrics:type=ThreadPools,path=request,scope=RequestResponseStage,name=CurrentlyBlockedTasks
+
+

plugins/inputs/cassandra/cassandra.go

@@ -0,0 +1,309 @@
+package cassandra
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/inputs"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"net/url"
+	"strings"
+)
+
+type JolokiaClient interface {
+	MakeRequest(req *http.Request) (*http.Response, error)
+}
+
+type JolokiaClientImpl struct {
+	client *http.Client
+}
+
+func (c JolokiaClientImpl) MakeRequest(req *http.Request) (*http.Response, error) {
+	return c.client.Do(req)
+}
+
+type Cassandra struct {
+	jClient JolokiaClient
+	Context string
+	Servers []string
+	Metrics []string
+}
+
+type javaMetric struct {
+	host   string
+	metric string
+	acc    telegraf.Accumulator
+}
+
+type cassandraMetric struct {
+	host   string
+	metric string
+	acc    telegraf.Accumulator
+}
+
+type jmxMetric interface {
+	addTagsFields(out map[string]interface{})
+}
+
+func newJavaMetric(host string, metric string,
+	acc telegraf.Accumulator) *javaMetric {
+	return &javaMetric{host: host, metric: metric, acc: acc}
+}
+
+func newCassandraMetric(host string, metric string,
+	acc telegraf.Accumulator) *cassandraMetric {
+	return &cassandraMetric{host: host, metric: metric, acc: acc}
+}
+
+func addValuesAsFields(values map[string]interface{}, fields map[string]interface{},
+	mname string) {
+	for k, v := range values {
+		if v != nil {
+			fields[mname+"_"+k] = v
+		}
+	}
+}
+
+func parseJmxMetricRequest(mbean string) map[string]string {
+	tokens := make(map[string]string)
+	classAndPairs := strings.Split(mbean, ":")
+	if classAndPairs[0] == "org.apache.cassandra.metrics" {
+		tokens["class"] = "cassandra"
+	} else if classAndPairs[0] == "java.lang" {
+		tokens["class"] = "java"
+	} else {
+		return tokens
+	}
+	pairs := strings.Split(classAndPairs[1], ",")
+	for _, pair := range pairs {
+		p := strings.Split(pair, "=")
+		tokens[p[0]] = p[1]
+	}
+	return tokens
+}
+
+func addTokensToTags(tokens map[string]string, tags map[string]string) {
+	for k, v := range tokens {
+		if k == "name" {
+			tags["mname"] = v // name seems to a reserved word in influxdb
+		} else if k == "class" || k == "type" {
+			continue // class and type are used in the metric name
+		} else {
+			tags[k] = v
+		}
+	}
+}
+
+func (j javaMetric) addTagsFields(out map[string]interface{}) {
+	tags := make(map[string]string)
+	fields := make(map[string]interface{})
+
+	a := out["request"].(map[string]interface{})
+	attribute := a["attribute"].(string)
+	mbean := a["mbean"].(string)
+
+	tokens := parseJmxMetricRequest(mbean)
+	addTokensToTags(tokens, tags)
+	tags["cassandra_host"] = j.host
+
+	if _, ok := tags["mname"]; !ok {
+		//Queries for a single value will not return a "name" tag in the response.
+		tags["mname"] = attribute
+	}
+
+	if values, ok := out["value"]; ok {
+		switch t := values.(type) {
+		case map[string]interface{}:
+			addValuesAsFields(values.(map[string]interface{}), fields, attribute)
+		case interface{}:
+			fields[attribute] = t
+		}
+		j.acc.AddFields(tokens["class"]+tokens["type"], fields, tags)
+	} else {
+		fmt.Printf("Missing key 'value' in '%s' output response\n%v\n",
+			j.metric, out)
+	}
+}
+
+func addCassandraMetric(mbean string, c cassandraMetric,
+	values map[string]interface{}) {
+
+	tags := make(map[string]string)
+	fields := make(map[string]interface{})
+	tokens := parseJmxMetricRequest(mbean)
+	addTokensToTags(tokens, tags)
+	tags["cassandra_host"] = c.host
+	addValuesAsFields(values, fields, tags["mname"])
+	c.acc.AddFields(tokens["class"]+tokens["type"], fields, tags)
+
+}
+
+func (c cassandraMetric) addTagsFields(out map[string]interface{}) {
+
+	r := out["request"]
+
+	tokens := parseJmxMetricRequest(r.(map[string]interface{})["mbean"].(string))
+	// Requests with wildcards for keyspace or table names will return nested
+	// maps in the json response
+	if (tokens["type"] == "Table" || tokens["type"] == "ColumnFamily") && (tokens["keyspace"] == "*" ||
+		tokens["scope"] == "*") {
+		if valuesMap, ok := out["value"]; ok {
+			for k, v := range valuesMap.(map[string]interface{}) {
+				addCassandraMetric(k, c, v.(map[string]interface{}))
+			}
+		} else {
+			fmt.Printf("Missing key 'value' in '%s' output response\n%v\n",
+				c.metric, out)
+			return
+		}
+	} else {
+		if values, ok := out["value"]; ok {
+			addCassandraMetric(r.(map[string]interface{})["mbean"].(string),
+				c, values.(map[string]interface{}))
+		} else {
+			fmt.Printf("Missing key 'value' in '%s' output response\n%v\n",
+				c.metric, out)
+			return
+		}
+	}
+}
+
+func (j *Cassandra) SampleConfig() string {
+	return `
+  # This is the context root used to compose the jolokia url
+  context = "/jolokia/read"
+  ## List of cassandra servers exposing jolokia read service
+  servers = ["myuser:mypassword@10.10.10.1:8778","10.10.10.2:8778",":8778"]
+  ## List of metrics collected on above servers
+  ## Each metric consists of a jmx path.
+  ## This will collect all heap memory usage metrics from the jvm and
+  ## ReadLatency metrics for all keyspaces and tables.
+  ## "type=Table" in the query works with Cassandra3.0. Older versions might
+  ## need to use "type=ColumnFamily"
+  metrics  = [
+    "/java.lang:type=Memory/HeapMemoryUsage",
+    "/org.apache.cassandra.metrics:type=Table,keyspace=*,scope=*,name=ReadLatency"
+  ]
+`
+}
+
+func (j *Cassandra) Description() string {
+	return "Read Cassandra metrics through Jolokia"
+}
+
+func (j *Cassandra) getAttr(requestUrl *url.URL) (map[string]interface{}, error) {
+	// Create + send request
+	req, err := http.NewRequest("GET", requestUrl.String(), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := j.jClient.MakeRequest(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	// Process response
+	if resp.StatusCode != http.StatusOK {
+		err = fmt.Errorf("Response from url \"%s\" has status code %d (%s), expected %d (%s)",
+			requestUrl,
+			resp.StatusCode,
+			http.StatusText(resp.StatusCode),
+			http.StatusOK,
+			http.StatusText(http.StatusOK))
+		return nil, err
+	}
+
+	// read body
+	body, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	// Unmarshal json
+	var jsonOut map[string]interface{}
+	if err = json.Unmarshal([]byte(body), &jsonOut); err != nil {
+		return nil, errors.New("Error decoding JSON response")
+	}
+
+	return jsonOut, nil
+}
+
+func parseServerTokens(server string) map[string]string {
+	serverTokens := make(map[string]string)
+
+	hostAndUser := strings.Split(server, "@")
+	hostPort := ""
+	userPasswd := ""
+	if len(hostAndUser) == 2 {
+		hostPort = hostAndUser[1]
+		userPasswd = hostAndUser[0]
+	} else {
+		hostPort = hostAndUser[0]
+	}
+	hostTokens := strings.Split(hostPort, ":")
+	serverTokens["host"] = hostTokens[0]
+	serverTokens["port"] = hostTokens[1]
+
+	if userPasswd != "" {
+		userTokens := strings.Split(userPasswd, ":")
+		serverTokens["user"] = userTokens[0]
+		serverTokens["passwd"] = userTokens[1]
+	}
+	return serverTokens
+}
+
+func (c *Cassandra) Gather(acc telegraf.Accumulator) error {
+	context := c.Context
+	servers := c.Servers
+	metrics := c.Metrics
+
+	for _, server := range servers {
+		for _, metric := range metrics {
+			serverTokens := parseServerTokens(server)
+
+			var m jmxMetric
+			if strings.HasPrefix(metric, "/java.lang:") {
+				m = newJavaMetric(serverTokens["host"], metric, acc)
+			} else if strings.HasPrefix(metric,
+				"/org.apache.cassandra.metrics:") {
+				m = newCassandraMetric(serverTokens["host"], metric, acc)
+			} else {
+				// unsupported metric type
+				log.Printf("I! Unsupported Cassandra metric [%s], skipping",
+					metric)
+				continue
+			}
+
+			// Prepare URL
+			requestUrl, err := url.Parse("http://" + serverTokens["host"] + ":" +
+				serverTokens["port"] + context + metric)
+			if err != nil {
+				return err
+			}
+			if serverTokens["user"] != "" && serverTokens["passwd"] != "" {
+				requestUrl.User = url.UserPassword(serverTokens["user"],
+					serverTokens["passwd"])
+			}
+			fmt.Printf("host %s url %s\n", serverTokens["host"], requestUrl)
+
+			out, err := c.getAttr(requestUrl)
+			if out["status"] != 200.0 {
+				fmt.Printf("URL returned with status %v\n", out["status"])
+				continue
+			}
+			m.addTagsFields(out)
+		}
+	}
+	return nil
+}
+
+func init() {
+	inputs.Add("cassandra", func() telegraf.Input {
+		return &Cassandra{jClient: &JolokiaClientImpl{client: &http.Client{}}}
+	})
+}

plugins/inputs/cassandra/cassandra_test.go

@@ -0,0 +1,286 @@
+package cassandra
+
+import (
+	_ "fmt"
+	"io/ioutil"
+	"net/http"
+	"strings"
+	"testing"
+
+	"github.com/influxdata/telegraf/testutil"
+	"github.com/stretchr/testify/assert"
+	_ "github.com/stretchr/testify/require"
+)
+
+const validJavaMultiValueJSON = `
+{
+  "request":{
+    "mbean":"java.lang:type=Memory",
+    "attribute":"HeapMemoryUsage",
+    "type":"read"
+  },
+  "value":{
+    "init":67108864,
+    "committed":456130560,
+    "max":477626368,
+    "used":203288528
+  },
+  "timestamp":1446129191,
+  "status":200
+}`
+
+const validCassandraMultiValueJSON = `
+{
+	"request": {
+		"mbean": "org.apache.cassandra.metrics:keyspace=test_keyspace1,name=ReadLatency,scope=test_table,type=Table",
+		"type": "read"},
+	"status": 200,
+	"timestamp": 1458089229,
+	"value": {
+		"999thPercentile": 20.0,
+		"99thPercentile": 10.0,
+		"Count": 400,
+		"DurationUnit": "microseconds",
+		"Max": 30.0,
+		"Mean": null,
+		"MeanRate": 3.0,
+		"Min": 1.0,
+		"RateUnit": "events/second",
+		"StdDev": null
+	}
+}`
+
+const validCassandraNestedMultiValueJSON = `
+{
+	"request": {
+		"mbean": "org.apache.cassandra.metrics:keyspace=test_keyspace1,name=ReadLatency,scope=*,type=Table",
+		"type": "read"},
+    "status": 200,
+    "timestamp": 1458089184,
+    "value": {
+		"org.apache.cassandra.metrics:keyspace=test_keyspace1,name=ReadLatency,scope=test_table1,type=Table":
+		{  	"999thPercentile": 1.0,
+			"Count": 100,
+			"DurationUnit": "microseconds",
+			"OneMinuteRate": 1.0,
+			"RateUnit": "events/second",
+			"StdDev": null
+		},
+		"org.apache.cassandra.metrics:keyspace=test_keyspace2,name=ReadLatency,scope=test_table2,type=Table":
+		{  	"999thPercentile": 2.0,
+			"Count": 200,
+			"DurationUnit": "microseconds",
+			"OneMinuteRate": 2.0,
+			"RateUnit": "events/second",
+			"StdDev": null
+		}
+	}
+}`
+
+const validSingleValueJSON = `
+{
+  "request":{
+    "path":"used",
+    "mbean":"java.lang:type=Memory",
+    "attribute":"HeapMemoryUsage",
+    "type":"read"
+  },
+  "value":209274376,
+  "timestamp":1446129256,
+  "status":200
+}`
+
+const validJavaMultiTypeJSON = `
+{
+   "request":{
+	   "mbean":"java.lang:name=ConcurrentMarkSweep,type=GarbageCollector",
+	   "attribute":"CollectionCount",
+	   "type":"read"
+   },
+   "value":1,
+   "timestamp":1459316570,
+   "status":200
+}`
+
+const invalidJSON = "I don't think this is JSON"
+
+const empty = ""
+
+var Servers = []string{"10.10.10.10:8778"}
+var AuthServers = []string{"user:passwd@10.10.10.10:8778"}
+var MultipleServers = []string{"10.10.10.10:8778", "10.10.10.11:8778"}
+var HeapMetric = "/java.lang:type=Memory/HeapMemoryUsage"
+var ReadLatencyMetric = "/org.apache.cassandra.metrics:type=Table,keyspace=test_keyspace1,scope=test_table,name=ReadLatency"
+var NestedReadLatencyMetric = "/org.apache.cassandra.metrics:type=Table,keyspace=test_keyspace1,scope=*,name=ReadLatency"
+var GarbageCollectorMetric1 = "/java.lang:type=GarbageCollector,name=ConcurrentMarkSweep/CollectionCount"
+var GarbageCollectorMetric2 = "/java.lang:type=GarbageCollector,name=ConcurrentMarkSweep/CollectionTime"
+var Context = "/jolokia/read"
+
+type jolokiaClientStub struct {
+	responseBody string
+	statusCode   int
+}
+
+func (c jolokiaClientStub) MakeRequest(req *http.Request) (*http.Response, error) {
+	resp := http.Response{}
+	resp.StatusCode = c.statusCode
+	resp.Body = ioutil.NopCloser(strings.NewReader(c.responseBody))
+	return &resp, nil
+}
+
+// Generates a pointer to an HttpJson object that uses a mock HTTP client.
+// Parameters:
+//     response  : Body of the response that the mock HTTP client should return
+//     statusCode: HTTP status code the mock HTTP client should return
+//
+// Returns:
+//     *HttpJson: Pointer to an HttpJson object that uses the generated mock HTTP client
+func genJolokiaClientStub(response string, statusCode int, servers []string, metrics []string) *Cassandra {
+	return &Cassandra{
+		jClient: jolokiaClientStub{responseBody: response, statusCode: statusCode},
+		Context: Context,
+		Servers: servers,
+		Metrics: metrics,
+	}
+}
+
+// Test that the proper values are ignored or collected for class=Java
+func TestHttpJsonJavaMultiValue(t *testing.T) {
+	cassandra := genJolokiaClientStub(validJavaMultiValueJSON, 200,
+		MultipleServers, []string{HeapMetric})
+
+	var acc testutil.Accumulator
+	acc.SetDebug(true)
+	err := cassandra.Gather(&acc)
+
+	assert.Nil(t, err)
+	assert.Equal(t, 2, len(acc.Metrics))
+
+	fields := map[string]interface{}{
+		"HeapMemoryUsage_init":      67108864.0,
+		"HeapMemoryUsage_committed": 456130560.0,
+		"HeapMemoryUsage_max":       477626368.0,
+		"HeapMemoryUsage_used":      203288528.0,
+	}
+	tags1 := map[string]string{
+		"cassandra_host": "10.10.10.10",
+		"mname":          "HeapMemoryUsage",
+	}
+
+	tags2 := map[string]string{
+		"cassandra_host": "10.10.10.11",
+		"mname":          "HeapMemoryUsage",
+	}
+	acc.AssertContainsTaggedFields(t, "javaMemory", fields, tags1)
+	acc.AssertContainsTaggedFields(t, "javaMemory", fields, tags2)
+}
+
+func TestHttpJsonJavaMultiType(t *testing.T) {
+	cassandra := genJolokiaClientStub(validJavaMultiTypeJSON, 200, AuthServers, []string{GarbageCollectorMetric1, GarbageCollectorMetric2})
+
+	var acc testutil.Accumulator
+	acc.SetDebug(true)
+	err := cassandra.Gather(&acc)
+
+	assert.Nil(t, err)
+	assert.Equal(t, 2, len(acc.Metrics))
+
+	fields := map[string]interface{}{
+		"CollectionCount": 1.0,
+	}
+
+	tags := map[string]string{
+		"cassandra_host": "10.10.10.10",
+		"mname":          "ConcurrentMarkSweep",
+	}
+	acc.AssertContainsTaggedFields(t, "javaGarbageCollector", fields, tags)
+}
+
+// Test that the proper values are ignored or collected
+func TestHttpJsonOn404(t *testing.T) {
+
+	jolokia := genJolokiaClientStub(validJavaMultiValueJSON, 404, Servers,
+		[]string{HeapMetric})
+
+	var acc testutil.Accumulator
+	err := jolokia.Gather(&acc)
+
+	assert.Nil(t, err)
+	assert.Equal(t, 0, len(acc.Metrics))
+}
+
+// Test that the proper values are ignored or collected for class=Cassandra
+func TestHttpJsonCassandraMultiValue(t *testing.T) {
+	cassandra := genJolokiaClientStub(validCassandraMultiValueJSON, 200, Servers, []string{ReadLatencyMetric})
+
+	var acc testutil.Accumulator
+	err := cassandra.Gather(&acc)
+
+	assert.Nil(t, err)
+	assert.Equal(t, 1, len(acc.Metrics))
+
+	fields := map[string]interface{}{
+		"ReadLatency_999thPercentile": 20.0,
+		"ReadLatency_99thPercentile":  10.0,
+		"ReadLatency_Count":           400.0,
+		"ReadLatency_DurationUnit":    "microseconds",
+		"ReadLatency_Max":             30.0,
+		"ReadLatency_MeanRate":        3.0,
+		"ReadLatency_Min":             1.0,
+		"ReadLatency_RateUnit":        "events/second",
+	}
+
+	tags := map[string]string{
+		"cassandra_host": "10.10.10.10",
+		"mname":          "ReadLatency",
+		"keyspace":       "test_keyspace1",
+		"scope":          "test_table",
+	}
+	acc.AssertContainsTaggedFields(t, "cassandraTable", fields, tags)
+}
+
+// Test that the proper values are ignored or collected for class=Cassandra with
+// nested values
+func TestHttpJsonCassandraNestedMultiValue(t *testing.T) {
+	cassandra := genJolokiaClientStub(validCassandraNestedMultiValueJSON, 200, Servers, []string{NestedReadLatencyMetric})
+
+	var acc testutil.Accumulator
+	acc.SetDebug(true)
+	err := cassandra.Gather(&acc)
+
+	assert.Nil(t, err)
+	assert.Equal(t, 2, len(acc.Metrics))
+
+	fields1 := map[string]interface{}{
+		"ReadLatency_999thPercentile": 1.0,
+		"ReadLatency_Count":           100.0,
+		"ReadLatency_DurationUnit":    "microseconds",
+		"ReadLatency_OneMinuteRate":   1.0,
+		"ReadLatency_RateUnit":        "events/second",
+	}
+
+	fields2 := map[string]interface{}{
+		"ReadLatency_999thPercentile": 2.0,
+		"ReadLatency_Count":           200.0,
+		"ReadLatency_DurationUnit":    "microseconds",
+		"ReadLatency_OneMinuteRate":   2.0,
+		"ReadLatency_RateUnit":        "events/second",
+	}
+
+	tags1 := map[string]string{
+		"cassandra_host": "10.10.10.10",
+		"mname":          "ReadLatency",
+		"keyspace":       "test_keyspace1",
+		"scope":          "test_table1",
+	}
+
+	tags2 := map[string]string{
+		"cassandra_host": "10.10.10.10",
+		"mname":          "ReadLatency",
+		"keyspace":       "test_keyspace2",
+		"scope":          "test_table2",
+	}
+
+	acc.AssertContainsTaggedFields(t, "cassandraTable", fields1, tags1)
+	acc.AssertContainsTaggedFields(t, "cassandraTable", fields2, tags2)
+}