151 lines
3.5 KiB
Go
151 lines
3.5 KiB
Go
package http_response
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import (
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"errors"
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"io"
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"net/http"
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"net/url"
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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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Body string
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Method string
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ResponseTimeout int
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Headers map[string]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 5 seconds)
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response_timeout = 5
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## HTTP Request Method
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method = "GET"
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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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## HTTP Request Headers (all values must be strings)
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# [inputs.http_response.headers]
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# Host = "github.com"
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## Optional HTTP Request Body
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# body = '''
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# {'fake':'data'}
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# '''
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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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// ErrRedirectAttempted indicates that a redirect occurred
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var ErrRedirectAttempted = errors.New("redirect")
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// CreateHttpClient creates an http client which will timeout at the specified
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// timeout period and can follow redirects if specified
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func CreateHttpClient(followRedirects bool, ResponseTimeout time.Duration) *http.Client {
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client := &http.Client{
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Timeout: time.Second * ResponseTimeout,
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}
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if followRedirects == false {
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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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return client
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}
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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 := CreateHttpClient(h.FollowRedirects, time.Duration(h.ResponseTimeout))
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var body io.Reader
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if h.Body != "" {
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body = strings.NewReader(h.Body)
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}
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request, err := http.NewRequest(h.Method, h.Address, body)
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if err != nil {
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return nil, err
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}
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for key, val := range h.Headers {
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request.Header.Add(key, val)
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if key == "Host" {
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request.Host = val
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}
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}
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// Start Timer
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start := time.Now()
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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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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 = 5
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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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