109 lines
2.2 KiB
Go
109 lines
2.2 KiB
Go
package prometheus
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import (
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"errors"
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"fmt"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/inputs"
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"io/ioutil"
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"net/http"
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"sync"
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"time"
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)
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type Prometheus struct {
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Urls []string
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}
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var sampleConfig = `
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## An array of urls to scrape metrics from.
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urls = ["http://localhost:9100/metrics"]
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`
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func (r *Prometheus) SampleConfig() string {
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return sampleConfig
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}
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func (r *Prometheus) Description() string {
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return "Read metrics from one or many prometheus clients"
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}
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var ErrProtocolError = errors.New("prometheus protocol error")
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// Reads stats from all configured servers accumulates stats.
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// Returns one of the errors encountered while gather stats (if any).
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func (g *Prometheus) Gather(acc telegraf.Accumulator) error {
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var wg sync.WaitGroup
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var outerr error
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for _, serv := range g.Urls {
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wg.Add(1)
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go func(serv string) {
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defer wg.Done()
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outerr = g.gatherURL(serv, acc)
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}(serv)
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}
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wg.Wait()
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return outerr
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}
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var tr = &http.Transport{
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ResponseHeaderTimeout: time.Duration(3 * time.Second),
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}
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var client = &http.Client{
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Transport: tr,
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Timeout: time.Duration(4 * time.Second),
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}
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func (g *Prometheus) gatherURL(url string, acc telegraf.Accumulator) error {
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collectDate := time.Now()
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resp, err := client.Get(url)
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if err != nil {
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return fmt.Errorf("error making HTTP request to %s: %s", url, err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return fmt.Errorf("%s returned HTTP status %s", url, resp.Status)
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}
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return fmt.Errorf("error reading body: %s", err)
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}
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// Headers
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headers := make(map[string]string)
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for key, value := range headers {
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headers[key] = value
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}
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// Prepare Prometheus parser config
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promparser := PrometheusParser{
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PromFormat: headers,
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}
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metrics, err := promparser.Parse(body)
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if err != nil {
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return fmt.Errorf("error getting processing samples for %s: %s",
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url, err)
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}
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// Add (or not) collected metrics
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for _, metric := range metrics {
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tags := metric.Tags()
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tags["url"] = url
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acc.AddFields(metric.Name(), metric.Fields(), tags, collectDate)
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}
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return nil
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}
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func init() {
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inputs.Add("prometheus", func() telegraf.Input {
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return &Prometheus{}
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})
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}
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