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http.go
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http.go
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package http
import (
"fmt"
"io"
"io/ioutil"
"net/http"
"strings"
"sync"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/plugins/common/tls"
"github.com/influxdata/telegraf/plugins/inputs"
"github.com/influxdata/telegraf/plugins/parsers"
)
type HTTP struct {
URLs []string `toml:"urls"`
Method string `toml:"method"`
Body string `toml:"body"`
ContentEncoding string `toml:"content_encoding"`
Headers map[string]string `toml:"headers"`
// HTTP Basic Auth Credentials
Username string `toml:"username"`
Password string `toml:"password"`
tls.ClientConfig
// Absolute path to file with Bearer token
BearerToken string `toml:"bearer_token"`
SuccessStatusCodes []int `toml:"success_status_codes"`
Timeout internal.Duration `toml:"timeout"`
client *http.Client
// The parser will automatically be set by Telegraf core code because
// this plugin implements the ParserInput interface (i.e. the SetParser method)
parser parsers.Parser
}
var sampleConfig = `
## One or more URLs from which to read formatted metrics
urls = [
"http://localhost/metrics"
]
## HTTP method
# method = "GET"
## Optional HTTP headers
# headers = {"X-Special-Header" = "Special-Value"}
## Optional file with Bearer token
## file content is added as an Authorization header
# bearer_token = "/path/to/file"
## Optional HTTP Basic Auth Credentials
# username = "username"
# password = "pa$$word"
## HTTP entity-body to send with POST/PUT requests.
# body = ""
## HTTP Content-Encoding for write request body, can be set to "gzip" to
## compress body or "identity" to apply no encoding.
# content_encoding = "identity"
## Optional TLS Config
# tls_ca = "/etc/telegraf/ca.pem"
# tls_cert = "/etc/telegraf/cert.pem"
# tls_key = "/etc/telegraf/key.pem"
## Use TLS but skip chain & host verification
# insecure_skip_verify = false
## Amount of time allowed to complete the HTTP request
# timeout = "5s"
## List of success status codes
# success_status_codes = [200]
## Data format to consume.
## Each data format has its 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"
`
// SampleConfig returns the default configuration of the Input
func (*HTTP) SampleConfig() string {
return sampleConfig
}
// Description returns a one-sentence description on the Input
func (*HTTP) Description() string {
return "Read formatted metrics from one or more HTTP endpoints"
}
func (h *HTTP) Init() error {
tlsCfg, err := h.ClientConfig.TLSConfig()
if err != nil {
return err
}
h.client = &http.Client{
Transport: &http.Transport{
TLSClientConfig: tlsCfg,
Proxy: http.ProxyFromEnvironment,
},
Timeout: h.Timeout.Duration,
}
// Set default as [200]
if len(h.SuccessStatusCodes) == 0 {
h.SuccessStatusCodes = []int{200}
}
return nil
}
// Gather takes in an accumulator and adds the metrics that the Input
// gathers. This is called every "interval"
func (h *HTTP) Gather(acc telegraf.Accumulator) error {
var wg sync.WaitGroup
for _, u := range h.URLs {
wg.Add(1)
go func(url string) {
defer wg.Done()
if err := h.gatherURL(acc, url); err != nil {
acc.AddError(fmt.Errorf("[url=%s]: %s", url, err))
}
}(u)
}
wg.Wait()
return nil
}
// SetParser takes the data_format from the config and finds the right parser for that format
func (h *HTTP) SetParser(parser parsers.Parser) {
h.parser = parser
}
// Gathers data from a particular URL
// Parameters:
// acc : The telegraf Accumulator to use
// url : endpoint to send request to
//
// Returns:
// error: Any error that may have occurred
func (h *HTTP) gatherURL(
acc telegraf.Accumulator,
url string,
) error {
body, err := makeRequestBodyReader(h.ContentEncoding, h.Body)
if err != nil {
return err
}
defer body.Close()
request, err := http.NewRequest(h.Method, url, body)
if err != nil {
return err
}
if h.BearerToken != "" {
token, err := ioutil.ReadFile(h.BearerToken)
if err != nil {
return err
}
bearer := "Bearer " + strings.Trim(string(token), "\n")
request.Header.Set("Authorization", bearer)
}
if h.ContentEncoding == "gzip" {
request.Header.Set("Content-Encoding", "gzip")
}
for k, v := range h.Headers {
if strings.ToLower(k) == "host" {
request.Host = v
} else {
request.Header.Add(k, v)
}
}
if h.Username != "" || h.Password != "" {
request.SetBasicAuth(h.Username, h.Password)
}
resp, err := h.client.Do(request)
if err != nil {
return err
}
defer resp.Body.Close()
responseHasSuccessCode := false
for _, statusCode := range h.SuccessStatusCodes {
if resp.StatusCode == statusCode {
responseHasSuccessCode = true
break
}
}
if !responseHasSuccessCode {
return fmt.Errorf("received status code %d (%s), expected any value out of %v",
resp.StatusCode,
http.StatusText(resp.StatusCode),
h.SuccessStatusCodes)
}
b, err := ioutil.ReadAll(resp.Body)
if err != nil {
return err
}
metrics, err := h.parser.Parse(b)
if err != nil {
return err
}
for _, metric := range metrics {
if !metric.HasTag("url") {
metric.AddTag("url", url)
}
acc.AddFields(metric.Name(), metric.Fields(), metric.Tags(), metric.Time())
}
return nil
}
func makeRequestBodyReader(contentEncoding, body string) (io.ReadCloser, error) {
var reader io.Reader = strings.NewReader(body)
if contentEncoding == "gzip" {
rc, err := internal.CompressWithGzip(reader)
if err != nil {
return nil, err
}
return rc, nil
}
return ioutil.NopCloser(reader), nil
}
func init() {
inputs.Add("http", func() telegraf.Input {
return &HTTP{
Timeout: internal.Duration{Duration: time.Second * 5},
Method: "GET",
}
})
}