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add graylog plugin

This commit is contained in:
Ali Alrahahleh 2016-05-24 15:30:09 -07:00
parent 50dd9ff483
commit 2bb5c356d6
2 changed files with 345 additions and 0 deletions
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44
plugins/inputs/graylog/README.md Normal file
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# GrayLog plugin
The Graylog plugin can collect data from remote Graylog service URLs which respond.
Sample configration
```
[[inputs.graylog]]
## NOTE This plugin only reads numerical measurements, strings and booleans
## will be ignored.
## a name for the service being polled
name = "graylog_jvm"
## URL of each server in the service's cluster
servers = [
"http://10.224.162.16:12900/system/metrics/multiple"
]
## List of tag names to extract from top-level of JSON server response
tag_keys = [
]
metrics = [
"jvm.cl.loaded",
"jvm.memory.pools.Metaspace.committed"
]
## HTTP Header parameters (all values must be strings)
[inputs.graylog.headers]
Authorization = "Basic YWRtaW46YWRtaW4"
Content-Type = "application/json"
Accept = "application/json"
## 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
```
List of metrics can be found on Graylog webservice documentation or by hitting the the web service api `http://[graylog-host]:12900/system/metrics`

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plugins/inputs/graylog/graylog.go Normal file
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package graylog
import (
"errors"
"fmt"
"strconv"
"bytes"
"regexp"
"io/ioutil"
"net/http"
"net/url"
"strings"
"sync"
"time"
"encoding/json"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/plugins/inputs"
"github.com/influxdata/telegraf/plugins/parsers"
)
type GrayLog struct {
Name string
Servers []string
TagKeys []string
Metrics []string
Headers map[string]string
// 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
client HTTPClient
}
type HTTPClient interface {
// Returns the result of an http request
//
// Parameters:
// req: HTTP request object
//
// Returns:
// http.Response: HTTP respons object
// error : Any error that may have occurred
MakeRequest(req *http.Request) (*http.Response, error)
SetHTTPClient(client *http.Client)
HTTPClient() *http.Client
}
type Messagebody struct {
Metrics []string `json:"metrics"`
}
type RealHTTPClient struct {
client *http.Client
}
func (c *RealHTTPClient) MakeRequest(req *http.Request) (*http.Response, error) {
return c.client.Do(req)
}
func (c *RealHTTPClient) SetHTTPClient(client *http.Client) {
c.client = client
}
func (c *RealHTTPClient) HTTPClient() *http.Client {
return c.client
}
var sampleConfig = `
## NOTE This plugin only reads numerical measurements, strings and booleans
## will be ignored.
## 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/",
]
## List of tag names to extract from top-level of JSON server response
# tag_keys = [
# "my_tag_1",
# "my_tag_2"
# ]
metrics = [
"jvm.cl.loaded",
"jvm.memory.pools.Metaspace.committed"
]
## HTTP Header parameters (all values must be strings)
# [inputs.graylog.headers]
# X-Auth-Token = "my-xauth-token"
# apiVersion = "v1"
## 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 (h *GrayLog) SampleConfig() string {
return sampleConfig
}
func (h *GrayLog) Description() string {
return "Read flattened metrics from one or more JSON HTTP endpoints"
}
// Gathers data for all servers.
func (h *GrayLog) Gather(acc telegraf.Accumulator) error {
var wg sync.WaitGroup
if h.client.HTTPClient() == nil {
tlsCfg, err := internal.GetTLSConfig(
h.SSLCert, h.SSLKey, h.SSLCA, h.InsecureSkipVerify)
if err != nil {
return err
}
tr := &http.Transport{
ResponseHeaderTimeout: time.Duration(3 * time.Second),
TLSClientConfig: tlsCfg,
}
client := &http.Client{
Transport: tr,
Timeout: time.Duration(4 * time.Second),
}
h.client.SetHTTPClient(client)
}
errorChannel := make(chan error, len(h.Servers))
for _, server := range h.Servers {
wg.Add(1)
go func(server string) {
defer wg.Done()
if err := h.gatherServer(acc, server); err != nil {
errorChannel <- err
}
}(server)
}
wg.Wait()
close(errorChannel)
// Get all errors and return them as one giant error
errorStrings := []string{}
for err := range errorChannel {
errorStrings = append(errorStrings, err.Error())
}
if len(errorStrings) == 0 {
return nil
}
return errors.New(strings.Join(errorStrings, "\n"))
}
// Gathers data from a particular server
// Parameters:
// acc : The telegraf Accumulator to use
// serverURL: endpoint to send request to
// service : the service being queried
//
// Returns:
// error: Any error that may have occurred
func (h *GrayLog) gatherServer(
acc telegraf.Accumulator,
serverURL string,
) error {
resp, responseTime, err := h.sendRequest(serverURL)
var dat map[string]interface{}
var name_list []string
if err != nil {
return err
}
var msrmnt_name string
if h.Name == "" {
msrmnt_name = "graylog"
} else {
msrmnt_name = "graylog_" + h.Name
}
tags := map[string]string{
"server": serverURL,
}
parser, err := parsers.NewJSONParser(msrmnt_name, h.TagKeys, tags)
if err != nil {
return err
}
if err := json.Unmarshal([]byte(resp), &dat); err != nil {
panic(err)
}
if rec, ok := dat["metrics"].([]interface{}); ok {
for _, metric := range rec {
if m, ok := metric.(map[string]interface{}); ok {
str, _ := m["full_name"].(string)
name_list = append(name_list, str)
}
}
}
metrics, err := parser.Parse([]byte(resp))
if err != nil {
return err
}
for _, metric := range metrics {
fields := make(map[string]interface{})
for k, v := range metric.Fields() {
re, _ := regexp.Compile(`metrics_([0-9]+)`)
match := re.FindAllStringSubmatch(k, -1)
if(match != nil) {
i, _ := strconv.Atoi(match[0][1])
fields[name_list[i]] = v
}
}
fields["response_time"] = responseTime
acc.AddFields(metric.Name(), fields, metric.Tags())
}
return nil
}
// Sends an HTTP request to the server using the GrayLog object's HTTPClient.
// Parameters:
// serverURL: endpoint to send request to
//
// Returns:
// string: body of the response
// error : Any error that may have occurred
func (h *GrayLog) sendRequest(serverURL string) (string, float64, error) {
// Prepare URL
requestURL, err := url.Parse(serverURL)
if err != nil {
return "", -1, fmt.Errorf("Invalid server URL \"%s\"", serverURL)
}
m := &Messagebody{Metrics: h.Metrics}
http_body, err := json.Marshal(m)
if err != nil {
return "", -1, fmt.Errorf("Invalid list of Metrics %s", h.Metrics)
}
req, err := http.NewRequest("POST", requestURL.String(), bytes.NewBuffer(http_body))
if err != nil {
return "", -1, err
}
// Add header parameters
for k, v := range h.Headers {
if strings.ToLower(k) == "host" {
req.Host = v
} else {
req.Header.Add(k, v)
}
}
start := time.Now()
resp, err := h.client.MakeRequest(req)
if err != nil {
return "", -1, err
}
defer resp.Body.Close()
responseTime := time.Since(start).Seconds()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return string(body), responseTime, err
}
// Process response
if resp.StatusCode != http.StatusOK {
err = fmt.Errorf("Response from url \"%s\" has status code %d (%s), expected %d (%s)",
requestURL.String(),
resp.StatusCode,
http.StatusText(resp.StatusCode),
http.StatusOK,
http.StatusText(http.StatusOK))
return string(body), responseTime, err
}
return string(body), responseTime, err
}
func init() {
inputs.Add("graylog", func() telegraf.Input {
return &GrayLog{
client: &RealHTTPClient{},
}
})
}