telegraf/plugins/inputs/cloudwatch/cloudwatch.go

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package cloudwatch
import (
"fmt"
"net"
"net/http"
"strconv"
"strings"
"sync"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/cloudwatch"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/filter"
"github.com/influxdata/telegraf/internal"
internalaws "github.com/influxdata/telegraf/internal/config/aws"
"github.com/influxdata/telegraf/internal/limiter"
"github.com/influxdata/telegraf/metric"
"github.com/influxdata/telegraf/plugins/inputs"
)
type (
// CloudWatch contains the configuration and cache for the cloudwatch plugin.
CloudWatch struct {
Region string `toml:"region"`
AccessKey string `toml:"access_key"`
SecretKey string `toml:"secret_key"`
RoleARN string `toml:"role_arn"`
Profile string `toml:"profile"`
CredentialPath string `toml:"shared_credential_file"`
Token string `toml:"token"`
EndpointURL string `toml:"endpoint_url"`
StatisticExclude []string `toml:"statistic_exclude"`
StatisticInclude []string `toml:"statistic_include"`
Timeout internal.Duration `toml:"timeout"`
Period internal.Duration `toml:"period"`
Delay internal.Duration `toml:"delay"`
Namespace string `toml:"namespace"`
Metrics []*Metric `toml:"metrics"`
CacheTTL internal.Duration `toml:"cache_ttl"`
RateLimit int `toml:"ratelimit"`
Log telegraf.Logger `toml:"-"`
client cloudwatchClient
statFilter filter.Filter
metricCache *metricCache
queryDimensions map[string]*map[string]string
windowStart time.Time
windowEnd time.Time
}
// Metric defines a simplified Cloudwatch metric.
Metric struct {
StatisticExclude *[]string `toml:"statistic_exclude"`
StatisticInclude *[]string `toml:"statistic_include"`
MetricNames []string `toml:"names"`
Dimensions []*Dimension `toml:"dimensions"`
}
// Dimension defines a simplified Cloudwatch dimension (provides metric filtering).
Dimension struct {
Name string `toml:"name"`
Value string `toml:"value"`
}
// metricCache caches metrics, their filters, and generated queries.
metricCache struct {
ttl time.Duration
built time.Time
metrics []filteredMetric
queries []*cloudwatch.MetricDataQuery
}
cloudwatchClient interface {
ListMetrics(*cloudwatch.ListMetricsInput) (*cloudwatch.ListMetricsOutput, error)
GetMetricData(*cloudwatch.GetMetricDataInput) (*cloudwatch.GetMetricDataOutput, error)
}
)
// SampleConfig returns the default configuration of the Cloudwatch input plugin.
func (c *CloudWatch) SampleConfig() string {
return `
## Amazon Region
region = "us-east-1"
## Amazon Credentials
## Credentials are loaded in the following order
## 1) Assumed credentials via STS if role_arn is specified
## 2) explicit credentials from 'access_key' and 'secret_key'
## 3) shared profile from 'profile'
## 4) environment variables
## 5) shared credentials file
## 6) EC2 Instance Profile
# access_key = ""
# secret_key = ""
# token = ""
# role_arn = ""
# profile = ""
# shared_credential_file = ""
## Endpoint to make request against, the correct endpoint is automatically
## determined and this option should only be set if you wish to override the
## default.
## ex: endpoint_url = "http://localhost:8000"
# endpoint_url = ""
# The minimum period for Cloudwatch metrics is 1 minute (60s). However not all
# metrics are made available to the 1 minute period. Some are collected at
# 3 minute, 5 minute, or larger intervals. See https://aws.amazon.com/cloudwatch/faqs/#monitoring.
# Note that if a period is configured that is smaller than the minimum for a
# particular metric, that metric will not be returned by the Cloudwatch API
# and will not be collected by Telegraf.
#
## Requested CloudWatch aggregation Period (required - must be a multiple of 60s)
period = "5m"
## Collection Delay (required - must account for metrics availability via CloudWatch API)
delay = "5m"
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## Recommended: use metric 'interval' that is a multiple of 'period' to avoid
## gaps or overlap in pulled data
interval = "5m"
## Configure the TTL for the internal cache of metrics.
# cache_ttl = "1h"
## Metric Statistic Namespace (required)
namespace = "AWS/ELB"
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## Maximum requests per second. Note that the global default AWS rate limit is
## 50 reqs/sec, so if you define multiple namespaces, these should add up to a
## maximum of 50.
## See http://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/cloudwatch_limits.html
# ratelimit = 25
## Timeout for http requests made by the cloudwatch client.
# timeout = "5s"
## Namespace-wide statistic filters. These allow fewer queries to be made to
## cloudwatch.
# statistic_include = [ "average", "sum", "minimum", "maximum", sample_count" ]
# statistic_exclude = []
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## Metrics to Pull
## Defaults to all Metrics in Namespace if nothing is provided
## Refreshes Namespace available metrics every 1h
#[[inputs.cloudwatch.metrics]]
# names = ["Latency", "RequestCount"]
#
# ## Statistic filters for Metric. These allow for retrieving specific
# ## statistics for an individual metric.
# # statistic_include = [ "average", "sum", "minimum", "maximum", sample_count" ]
# # statistic_exclude = []
#
# ## Dimension filters for Metric. All dimensions defined for the metric names
# ## must be specified in order to retrieve the metric statistics.
# [[inputs.cloudwatch.metrics.dimensions]]
# name = "LoadBalancerName"
# value = "p-example"
`
}
// Description returns a one-sentence description on the Cloudwatch input plugin.
func (c *CloudWatch) Description() string {
return "Pull Metric Statistics from Amazon CloudWatch"
}
// Gather takes in an accumulator and adds the metrics that the Input
// gathers. This is called every "interval".
func (c *CloudWatch) Gather(acc telegraf.Accumulator) error {
if c.statFilter == nil {
var err error
// Set config level filter (won't change throughout life of plugin).
c.statFilter, err = filter.NewIncludeExcludeFilter(c.StatisticInclude, c.StatisticExclude)
if err != nil {
return err
}
}
if c.client == nil {
c.initializeCloudWatch()
}
filteredMetrics, err := getFilteredMetrics(c)
if err != nil {
return err
}
c.updateWindow(time.Now())
// Get all of the possible queries so we can send groups of 100.
queries, err := c.getDataQueries(filteredMetrics)
if err != nil {
return err
}
if len(queries) == 0 {
return nil
}
// Limit concurrency or we can easily exhaust user connection limit.
// See cloudwatch API request limits:
// http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/cloudwatch_limits.html
lmtr := limiter.NewRateLimiter(c.RateLimit, time.Second)
defer lmtr.Stop()
wg := sync.WaitGroup{}
rLock := sync.Mutex{}
results := []*cloudwatch.MetricDataResult{}
// 100 is the maximum number of metric data queries a `GetMetricData` request can contain.
batchSize := 100
var batches [][]*cloudwatch.MetricDataQuery
for batchSize < len(queries) {
queries, batches = queries[batchSize:], append(batches, queries[0:batchSize:batchSize])
}
batches = append(batches, queries)
for i := range batches {
wg.Add(1)
<-lmtr.C
go func(inm []*cloudwatch.MetricDataQuery) {
defer wg.Done()
result, err := c.gatherMetrics(c.getDataInputs(inm))
if err != nil {
acc.AddError(err)
return
}
rLock.Lock()
results = append(results, result...)
rLock.Unlock()
}(batches[i])
}
wg.Wait()
return c.aggregateMetrics(acc, results)
}
func (c *CloudWatch) initializeCloudWatch() {
credentialConfig := &internalaws.CredentialConfig{
Region: c.Region,
AccessKey: c.AccessKey,
SecretKey: c.SecretKey,
RoleARN: c.RoleARN,
Profile: c.Profile,
Filename: c.CredentialPath,
Token: c.Token,
EndpointURL: c.EndpointURL,
}
configProvider := credentialConfig.Credentials()
cfg := &aws.Config{
HTTPClient: &http.Client{
// use values from DefaultTransport
Transport: &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}).DialContext,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
},
Timeout: c.Timeout.Duration,
},
}
loglevel := aws.LogOff
c.client = cloudwatch.New(configProvider, cfg.WithLogLevel(loglevel))
}
type filteredMetric struct {
metrics []*cloudwatch.Metric
statFilter filter.Filter
}
// getFilteredMetrics returns metrics specified in the config file or metrics listed from Cloudwatch.
func getFilteredMetrics(c *CloudWatch) ([]filteredMetric, error) {
if c.metricCache != nil && c.metricCache.isValid() {
return c.metricCache.metrics, nil
}
fMetrics := []filteredMetric{}
// check for provided metric filter
if c.Metrics != nil {
for _, m := range c.Metrics {
metrics := []*cloudwatch.Metric{}
if !hasWilcard(m.Dimensions) {
dimensions := make([]*cloudwatch.Dimension, len(m.Dimensions))
for k, d := range m.Dimensions {
dimensions[k] = &cloudwatch.Dimension{
Name: aws.String(d.Name),
Value: aws.String(d.Value),
}
}
for _, name := range m.MetricNames {
metrics = append(metrics, &cloudwatch.Metric{
Namespace: aws.String(c.Namespace),
MetricName: aws.String(name),
Dimensions: dimensions,
})
}
} else {
allMetrics, err := c.fetchNamespaceMetrics()
if err != nil {
return nil, err
}
for _, name := range m.MetricNames {
for _, metric := range allMetrics {
if isSelected(name, metric, m.Dimensions) {
metrics = append(metrics, &cloudwatch.Metric{
Namespace: aws.String(c.Namespace),
MetricName: aws.String(name),
Dimensions: metric.Dimensions,
})
}
}
}
}
if m.StatisticExclude == nil {
m.StatisticExclude = &c.StatisticExclude
}
if m.StatisticInclude == nil {
m.StatisticInclude = &c.StatisticInclude
}
statFilter, err := filter.NewIncludeExcludeFilter(*m.StatisticInclude, *m.StatisticExclude)
if err != nil {
return nil, err
}
fMetrics = append(fMetrics, filteredMetric{
metrics: metrics,
statFilter: statFilter,
})
}
} else {
metrics, err := c.fetchNamespaceMetrics()
if err != nil {
return nil, err
}
fMetrics = []filteredMetric{{
metrics: metrics,
statFilter: c.statFilter,
}}
}
c.metricCache = &metricCache{
metrics: fMetrics,
built: time.Now(),
ttl: c.CacheTTL.Duration,
}
return fMetrics, nil
}
// fetchNamespaceMetrics retrieves available metrics for a given CloudWatch namespace.
func (c *CloudWatch) fetchNamespaceMetrics() ([]*cloudwatch.Metric, error) {
metrics := []*cloudwatch.Metric{}
var token *string
params := &cloudwatch.ListMetricsInput{
Namespace: aws.String(c.Namespace),
Dimensions: []*cloudwatch.DimensionFilter{},
NextToken: token,
MetricName: nil,
}
for {
resp, err := c.client.ListMetrics(params)
if err != nil {
return nil, err
}
metrics = append(metrics, resp.Metrics...)
if resp.NextToken == nil {
break
}
params.NextToken = resp.NextToken
}
return metrics, nil
}
func (c *CloudWatch) updateWindow(relativeTo time.Time) {
windowEnd := relativeTo.Add(-c.Delay.Duration)
if c.windowEnd.IsZero() {
// this is the first run, no window info, so just get a single period
c.windowStart = windowEnd.Add(-c.Period.Duration)
} else {
// subsequent window, start where last window left off
c.windowStart = c.windowEnd
}
c.windowEnd = windowEnd
}
// getDataQueries gets all of the possible queries so we can maximize the request payload.
func (c *CloudWatch) getDataQueries(filteredMetrics []filteredMetric) ([]*cloudwatch.MetricDataQuery, error) {
if c.metricCache != nil && c.metricCache.queries != nil && c.metricCache.isValid() {
return c.metricCache.queries, nil
}
c.queryDimensions = map[string]*map[string]string{}
dataQueries := []*cloudwatch.MetricDataQuery{}
for i, filtered := range filteredMetrics {
for j, metric := range filtered.metrics {
id := strconv.Itoa(j) + "_" + strconv.Itoa(i)
dimension := ctod(metric.Dimensions)
if filtered.statFilter.Match("average") {
c.queryDimensions["average_"+id] = dimension
dataQueries = append(dataQueries, &cloudwatch.MetricDataQuery{
Id: aws.String("average_" + id),
Label: aws.String(snakeCase(*metric.MetricName + "_average")),
MetricStat: &cloudwatch.MetricStat{
Metric: metric,
Period: aws.Int64(int64(c.Period.Duration.Seconds())),
Stat: aws.String(cloudwatch.StatisticAverage),
},
})
}
if filtered.statFilter.Match("maximum") {
c.queryDimensions["maximum_"+id] = dimension
dataQueries = append(dataQueries, &cloudwatch.MetricDataQuery{
Id: aws.String("maximum_" + id),
Label: aws.String(snakeCase(*metric.MetricName + "_maximum")),
MetricStat: &cloudwatch.MetricStat{
Metric: metric,
Period: aws.Int64(int64(c.Period.Duration.Seconds())),
Stat: aws.String(cloudwatch.StatisticMaximum),
},
})
}
if filtered.statFilter.Match("minimum") {
c.queryDimensions["minimum_"+id] = dimension
dataQueries = append(dataQueries, &cloudwatch.MetricDataQuery{
Id: aws.String("minimum_" + id),
Label: aws.String(snakeCase(*metric.MetricName + "_minimum")),
MetricStat: &cloudwatch.MetricStat{
Metric: metric,
Period: aws.Int64(int64(c.Period.Duration.Seconds())),
Stat: aws.String(cloudwatch.StatisticMinimum),
},
})
}
if filtered.statFilter.Match("sum") {
c.queryDimensions["sum_"+id] = dimension
dataQueries = append(dataQueries, &cloudwatch.MetricDataQuery{
Id: aws.String("sum_" + id),
Label: aws.String(snakeCase(*metric.MetricName + "_sum")),
MetricStat: &cloudwatch.MetricStat{
Metric: metric,
Period: aws.Int64(int64(c.Period.Duration.Seconds())),
Stat: aws.String(cloudwatch.StatisticSum),
},
})
}
if filtered.statFilter.Match("sample_count") {
c.queryDimensions["sample_count_"+id] = dimension
dataQueries = append(dataQueries, &cloudwatch.MetricDataQuery{
Id: aws.String("sample_count_" + id),
Label: aws.String(snakeCase(*metric.MetricName + "_sample_count")),
MetricStat: &cloudwatch.MetricStat{
Metric: metric,
Period: aws.Int64(int64(c.Period.Duration.Seconds())),
Stat: aws.String(cloudwatch.StatisticSampleCount),
},
})
}
}
}
if len(dataQueries) == 0 {
c.Log.Debug("no metrics found to collect")
return nil, nil
}
if c.metricCache == nil {
c.metricCache = &metricCache{
queries: dataQueries,
built: time.Now(),
ttl: c.CacheTTL.Duration,
}
} else {
c.metricCache.queries = dataQueries
}
return dataQueries, nil
}
// gatherMetrics gets metric data from Cloudwatch.
func (c *CloudWatch) gatherMetrics(
params *cloudwatch.GetMetricDataInput,
) ([]*cloudwatch.MetricDataResult, error) {
results := []*cloudwatch.MetricDataResult{}
for {
resp, err := c.client.GetMetricData(params)
if err != nil {
return nil, fmt.Errorf("failed to get metric data: %v", err)
}
results = append(results, resp.MetricDataResults...)
if resp.NextToken == nil {
break
}
params.NextToken = resp.NextToken
}
return results, nil
}
func (c *CloudWatch) aggregateMetrics(
acc telegraf.Accumulator,
metricDataResults []*cloudwatch.MetricDataResult,
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) error {
var (
grouper = metric.NewSeriesGrouper()
namespace = sanitizeMeasurement(c.Namespace)
)
for _, result := range metricDataResults {
tags := map[string]string{}
if dimensions, ok := c.queryDimensions[*result.Id]; ok {
tags = *dimensions
}
tags["region"] = c.Region
for i := range result.Values {
grouper.Add(namespace, tags, *result.Timestamps[i], *result.Label, *result.Values[i])
}
}
for _, metric := range grouper.Metrics() {
acc.AddMetric(metric)
}
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return nil
}
func init() {
inputs.Add("cloudwatch", func() telegraf.Input {
return &CloudWatch{
CacheTTL: internal.Duration{Duration: time.Hour},
RateLimit: 25,
Timeout: internal.Duration{Duration: time.Second * 5},
}
})
}
func sanitizeMeasurement(namespace string) string {
namespace = strings.Replace(namespace, "/", "_", -1)
namespace = snakeCase(namespace)
return "cloudwatch_" + namespace
}
func snakeCase(s string) string {
s = internal.SnakeCase(s)
s = strings.Replace(s, " ", "_", -1)
s = strings.Replace(s, "__", "_", -1)
return s
}
type dimension struct {
name string
value string
}
// ctod converts cloudwatch dimensions to regular dimensions.
func ctod(cDimensions []*cloudwatch.Dimension) *map[string]string {
dimensions := map[string]string{}
for i := range cDimensions {
dimensions[snakeCase(*cDimensions[i].Name)] = *cDimensions[i].Value
}
return &dimensions
}
func (c *CloudWatch) getDataInputs(dataQueries []*cloudwatch.MetricDataQuery) *cloudwatch.GetMetricDataInput {
return &cloudwatch.GetMetricDataInput{
StartTime: aws.Time(c.windowStart),
EndTime: aws.Time(c.windowEnd),
MetricDataQueries: dataQueries,
}
}
// isValid checks the validity of the metric cache.
func (f *metricCache) isValid() bool {
return f.metrics != nil && time.Since(f.built) < f.ttl
}
func hasWilcard(dimensions []*Dimension) bool {
for _, d := range dimensions {
if d.Value == "" || d.Value == "*" {
return true
}
}
return false
}
func isSelected(name string, metric *cloudwatch.Metric, dimensions []*Dimension) bool {
if name != *metric.MetricName {
return false
}
if len(metric.Dimensions) != len(dimensions) {
return false
}
for _, d := range dimensions {
selected := false
for _, d2 := range metric.Dimensions {
if d.Name == *d2.Name {
if d.Value == "" || d.Value == "*" || d.Value == *d2.Value {
selected = true
}
}
}
if !selected {
return false
}
}
return true
}