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httpjson.go
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httpjson.go
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//go:generate ../../../tools/readme_config_includer/generator
package httpjson
import (
"bytes"
_ "embed"
"fmt"
"io"
"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"
"github.com/influxdata/telegraf/plugins/parsers/json"
)
//go:embed sample.conf
var sampleConfig string
var (
utf8BOM = []byte("\xef\xbb\xbf")
)
// HTTPJSON struct
type HTTPJSON struct {
Name string `toml:"name" deprecated:"1.3.0;use 'name_override', 'name_suffix', 'name_prefix' instead"`
Servers []string
Method string
TagKeys []string
ResponseTimeout config.Duration
Parameters map[string]string
Headers map[string]string
tls.ClientConfig
client HTTPClient
}
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
}
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
}
func (*HTTPJSON) SampleConfig() string {
return sampleConfig
}
// Gathers data for all servers.
func (h *HTTPJSON) 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.ResponseTimeout),
TLSClientConfig: tlsCfg,
}
client := &http.Client{
Transport: tr,
Timeout: time.Duration(h.ResponseTimeout),
}
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 *HTTPJSON) gatherServer(
acc telegraf.Accumulator,
serverURL string,
) error {
resp, responseTime, err := h.sendRequest(serverURL)
if err != nil {
return err
}
var msrmntName string
if h.Name == "" {
msrmntName = "httpjson"
} else {
msrmntName = "httpjson_" + h.Name
}
tags := map[string]string{
"server": serverURL,
}
parser := &json.Parser{
MetricName: msrmntName,
TagKeys: h.TagKeys,
DefaultTags: tags,
}
if err := parser.Init(); err != nil {
return err
}
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() {
fields[k] = v
}
fields["response_time"] = responseTime
acc.AddFields(metric.Name(), fields, metric.Tags())
}
return nil
}
// Sends an HTTP request to the server using the HTTPJSON object's HTTPClient.
// This request can be either a GET or a POST.
// Parameters:
//
// serverURL: endpoint to send request to
//
// Returns:
//
// string: body of the response
// error : Any error that may have occurred
func (h *HTTPJSON) sendRequest(serverURL string) (string, float64, error) {
// Prepare URL
requestURL, err := url.Parse(serverURL)
if err != nil {
return "", -1, fmt.Errorf("Invalid server URL %q", serverURL)
}
data := url.Values{}
switch {
case h.Method == "GET":
params := requestURL.Query()
for k, v := range h.Parameters {
params.Add(k, v)
}
requestURL.RawQuery = params.Encode()
case h.Method == "POST":
requestURL.RawQuery = ""
for k, v := range h.Parameters {
data.Add(k, v)
}
}
// Create + send request
req, err := http.NewRequest(h.Method, requestURL.String(),
strings.NewReader(data.Encode()))
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 := io.ReadAll(resp.Body)
if err != nil {
return string(body), responseTime, err
}
body = bytes.TrimPrefix(body, utf8BOM)
// 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("httpjson", func() telegraf.Input {
return &HTTPJSON{
client: &RealHTTPClient{},
ResponseTimeout: config.Duration(5 * time.Second),
}
})
}