141 lines
3.2 KiB
Go
141 lines
3.2 KiB
Go
package http_response
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import (
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"bufio"
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"errors"
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"fmt"
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"net/http"
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"net/textproto"
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"net/url"
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"os"
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"strings"
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"time"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/inputs"
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)
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// HTTPResponse struct
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type HTTPResponse struct {
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Address string
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Method string
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ResponseTimeout int
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Headers string
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FollowRedirects bool
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}
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// Description returns the plugin Description
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func (h *HTTPResponse) Description() string {
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return "HTTP/HTTPS request given an address a method and a timeout"
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}
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var sampleConfig = `
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## Server address (default http://localhost)
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address = "http://github.com"
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## Set response_timeout (default 10 seconds)
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response_timeout = 10
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## HTTP Method
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method = "GET"
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## HTTP Request Headers
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headers = '''
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Host: github.com
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'''
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## Whether to follow redirects from the server (defaults to false)
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follow_redirects = true
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`
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// SampleConfig returns the plugin SampleConfig
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func (h *HTTPResponse) SampleConfig() string {
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return sampleConfig
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}
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var ErrRedirectAttempted = errors.New("redirect")
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// HTTPGather gathers all fields and returns any errors it encounters
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func (h *HTTPResponse) HTTPGather() (map[string]interface{}, error) {
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// Prepare fields
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fields := make(map[string]interface{})
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client := &http.Client{
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Timeout: time.Second * time.Duration(h.ResponseTimeout),
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}
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if h.FollowRedirects == false {
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fmt.Println(h.FollowRedirects)
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client.CheckRedirect = func(req *http.Request, via []*http.Request) error {
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return ErrRedirectAttempted
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}
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}
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request, err := http.NewRequest(h.Method, h.Address, nil)
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if err != nil {
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return nil, err
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}
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h.Headers = strings.TrimSpace(h.Headers) + "\n\n"
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reader := bufio.NewReader(strings.NewReader(h.Headers))
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tp := textproto.NewReader(reader)
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mimeHeader, err := tp.ReadMIMEHeader()
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if err != nil {
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return nil, err
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}
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request.Header = http.Header(mimeHeader)
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// Start Timer
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start := time.Now()
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request.Write(os.Stdout)
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resp, err := client.Do(request)
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if err != nil {
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if h.FollowRedirects {
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return nil, err
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}
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if urlError, ok := err.(*url.Error); ok &&
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urlError.Err == ErrRedirectAttempted {
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fmt.Println(err)
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err = nil
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} else {
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return nil, err
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}
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}
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fields["response_time"] = time.Since(start).Seconds()
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fields["http_response_code"] = resp.StatusCode
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return fields, nil
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}
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// Gather gets all metric fields and tags and returns any errors it encounters
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func (h *HTTPResponse) Gather(acc telegraf.Accumulator) error {
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// Set default values
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if h.ResponseTimeout < 1 {
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h.ResponseTimeout = 10
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}
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// Check send and expected string
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if h.Method == "" {
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h.Method = "GET"
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}
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if h.Address == "" {
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h.Address = "http://localhost"
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}
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addr, err := url.Parse(h.Address)
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if err != nil {
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return err
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}
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if addr.Scheme != "http" && addr.Scheme != "https" {
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return errors.New("Only http and https are supported")
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}
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// Prepare data
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tags := map[string]string{"server": h.Address, "method": h.Method}
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var fields map[string]interface{}
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// Gather data
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fields, err = h.HTTPGather()
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if err != nil {
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return err
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}
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// Add metrics
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acc.AddFields("http_response", fields, tags)
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return nil
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}
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func init() {
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inputs.Add("http_response", func() telegraf.Input {
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return &HTTPResponse{}
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})
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}
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