telegraf/plugins/inputs/http_response/http_response.go

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package http_response
import (
"errors"
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"io"
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"net/http"
"net/url"
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"strings"
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"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/inputs"
)
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// HTTPResponse struct
type HTTPResponse struct {
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Address string
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Body string
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Method string
ResponseTimeout int
Headers map[string]string
FollowRedirects bool
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}
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// Description returns the plugin Description
func (h *HTTPResponse) Description() string {
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return "HTTP/HTTPS request given an address a method and a timeout"
}
var sampleConfig = `
## Server address (default http://localhost)
address = "http://github.com"
## Set response_timeout (default 5 seconds)
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)
follow_redirects = true
## HTTP Request Headers (all values must be strings)
# [inputs.http_response.headers]
# Host = "github.com"
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## Optional HTTP Request Body
# body = '''
# {'fake':'data'}
# '''
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`
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// SampleConfig returns the plugin SampleConfig
func (h *HTTPResponse) SampleConfig() string {
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return sampleConfig
}
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// ErrRedirectAttempted indicates that a redirect occurred
var ErrRedirectAttempted = errors.New("redirect")
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// CreateHttpClient creates an http client which will timeout at the specified
// timeout period and can follow redirects if specified
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 {
client.CheckRedirect = func(req *http.Request, via []*http.Request) error {
return ErrRedirectAttempted
}
}
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return client
}
// CreateHeaders takes a map of header strings and puts them
// into a http.Header Object
func CreateHeaders(headers map[string]string) http.Header {
httpHeaders := make(http.Header)
for key := range headers {
httpHeaders.Add(key, headers[key])
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}
return httpHeaders
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}
// HTTPGather gathers all fields and returns any errors it encounters
func (h *HTTPResponse) HTTPGather() (map[string]interface{}, error) {
// Prepare fields
fields := make(map[string]interface{})
client := CreateHttpClient(h.FollowRedirects, time.Duration(h.ResponseTimeout))
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var body io.Reader
if h.Body != "" {
body = strings.NewReader(h.Body)
}
request, err := http.NewRequest(h.Method, h.Address, body)
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if err != nil {
return nil, err
}
request.Header = CreateHeaders(h.Headers)
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// Start Timer
start := time.Now()
resp, err := client.Do(request)
if err != nil {
if h.FollowRedirects {
return nil, err
}
if urlError, ok := err.(*url.Error); ok &&
urlError.Err == ErrRedirectAttempted {
err = nil
} else {
return nil, err
}
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}
fields["response_time"] = time.Since(start).Seconds()
fields["http_response_code"] = resp.StatusCode
return fields, nil
}
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// Gather gets all metric fields and tags and returns any errors it encounters
func (h *HTTPResponse) Gather(acc telegraf.Accumulator) error {
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// Set default values
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if h.ResponseTimeout < 1 {
h.ResponseTimeout = 5
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}
// Check send and expected string
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if h.Method == "" {
h.Method = "GET"
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}
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if h.Address == "" {
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 {
return err
}
if addr.Scheme != "http" && addr.Scheme != "https" {
return errors.New("Only http and https are supported")
}
// 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{}
// Gather data
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fields, err = h.HTTPGather()
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if err != nil {
return err
}
// Add metrics
acc.AddFields("http_response", fields, tags)
return nil
}
func init() {
inputs.Add("http_response", func() telegraf.Input {
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return &HTTPResponse{}
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})
}