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graylog.go
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graylog.go
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//go:generate ../../../tools/readme_config_includer/generator
package graylog
import (
"bytes"
_ "embed"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"net"
"net/http"
"net/url"
"strings"
"sync"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/config"
"github.com/influxdata/telegraf/plugins/common/tls"
"github.com/influxdata/telegraf/plugins/inputs"
)
//go:embed sample.conf
var sampleConfig string
type GrayLog struct {
Servers []string `toml:"servers"`
Metrics []string `toml:"metrics"`
Username string `toml:"username"`
Password string `toml:"password"`
Timeout config.Duration `toml:"timeout"`
tls.ClientConfig
client HTTPClient
}
type responseMetrics struct {
Metrics []metric `json:"metrics"`
}
type metric struct {
FullName string `json:"full_name"`
Name string `json:"name"`
Type string `json:"type"`
Fields map[string]interface{} `json:"metric"`
}
type messageBody struct {
Metrics []string `json:"metrics"`
}
type realHTTPClient struct {
client *http.Client
}
type HTTPClient interface {
// Returns the result of an http request
//
// Parameters:
// req: HTTP request object
//
// Returns:
// http.Response: HTTP response object
// error : Any error that may have occurred
MakeRequest(req *http.Request) (*http.Response, error)
SetHTTPClient(client *http.Client)
HTTPClient() *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
}
func (*GrayLog) SampleConfig() string {
return sampleConfig
}
// Gathers data for all servers.
func (h *GrayLog) Gather(acc telegraf.Accumulator) error {
var wg sync.WaitGroup
if h.client.HTTPClient() == nil {
tlsCfg, err := h.ClientConfig.TLSConfig()
if err != nil {
return err
}
tr := &http.Transport{
ResponseHeaderTimeout: time.Duration(h.Timeout),
TLSClientConfig: tlsCfg,
}
client := &http.Client{
Transport: tr,
Timeout: time.Duration(h.Timeout),
}
h.client.SetHTTPClient(client)
}
for _, server := range h.Servers {
wg.Add(1)
go func(server string) {
defer wg.Done()
acc.AddError(h.gatherServer(acc, server))
}(server)
}
wg.Wait()
return nil
}
// 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, _, err := h.sendRequest(serverURL)
if err != nil {
return err
}
requestURL, err := url.Parse(serverURL)
if err != nil {
return fmt.Errorf("unable to parse address %q: %w", serverURL, err)
}
host, port, err := net.SplitHostPort(requestURL.Host)
if err != nil {
return fmt.Errorf("unable to parse address host %q: %w", requestURL.Host, err)
}
var dat responseMetrics
if err := json.Unmarshal([]byte(resp), &dat); err != nil {
return err
}
for _, mItem := range dat.Metrics {
fields := make(map[string]interface{})
tags := map[string]string{
"server": host,
"port": port,
"name": mItem.Name,
"type": mItem.Type,
}
h.flatten(mItem.Fields, fields, "")
acc.AddFields(mItem.FullName, fields, tags)
}
return nil
}
// Flatten JSON hierarchy to produce field name and field value
// Parameters:
//
// item: Item map to flatten
// fields: Map to store generated fields.
// id: Prefix for top level metric (empty string "")
//
// Returns:
//
// void
func (h *GrayLog) flatten(item, fields map[string]interface{}, id string) {
if id != "" {
id = id + "_"
}
for k, i := range item {
switch i := i.(type) {
case int:
fields[id+k] = float64(i)
case float64:
fields[id+k] = i
case map[string]interface{}:
h.flatten(i, fields, id+k)
default:
}
}
}
// 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) {
headers := map[string]string{
"Content-Type": "application/json",
"Accept": "application/json",
}
method := "GET"
content := bytes.NewBufferString("")
headers["Authorization"] = "Basic " + base64.URLEncoding.EncodeToString([]byte(h.Username+":"+h.Password))
// Prepare URL
requestURL, err := url.Parse(serverURL)
if err != nil {
return "", -1, fmt.Errorf("invalid server URL %q", serverURL)
}
// Add X-Requested-By header
headers["X-Requested-By"] = "Telegraf"
if strings.Contains(requestURL.String(), "multiple") {
m := &messageBody{Metrics: h.Metrics}
httpBody, err := json.Marshal(m)
if err != nil {
return "", -1, fmt.Errorf("invalid list of Metrics %s", h.Metrics)
}
method = "POST"
content = bytes.NewBuffer(httpBody)
}
req, err := http.NewRequest(method, requestURL.String(), content)
if err != nil {
return "", -1, err
}
// Add header parameters
for k, v := range headers {
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 := io.ReadAll(resp.Body)
if err != nil {
return string(body), responseTime, err
}
// Process response
if resp.StatusCode != http.StatusOK {
err = fmt.Errorf("response from url %q 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{},
Timeout: config.Duration(5 * time.Second),
}
})
}