106 lines
2.3 KiB
Go
106 lines
2.3 KiB
Go
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package prometheus
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import (
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"errors"
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"fmt"
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"net/http"
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"sync"
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"time"
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"github.com/influxdb/telegraf/plugins"
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"github.com/prometheus/client_golang/extraction"
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"github.com/prometheus/client_golang/model"
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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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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 plugins.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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func (g *Prometheus) gatherURL(url string, acc plugins.Accumulator) error {
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resp, err := http.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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processor, err := extraction.ProcessorForRequestHeader(resp.Header)
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if err != nil {
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return fmt.Errorf("error getting extractor for %s: %s", url, err)
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}
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ingestor := &Ingester{
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acc: acc,
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}
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options := &extraction.ProcessOptions{
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Timestamp: model.TimestampFromTime(time.Now()),
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}
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err = processor.ProcessSingle(resp.Body, ingestor, options)
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if err != nil {
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return fmt.Errorf("error getting processing samples for %s: %s", url, err)
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}
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return nil
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}
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type Ingester struct {
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acc plugins.Accumulator
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}
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// Ingest implements an extraction.Ingester.
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func (i *Ingester) Ingest(samples model.Samples) error {
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for _, sample := range samples {
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tags := map[string]string{}
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for key, value := range sample.Metric {
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if key == model.MetricNameLabel {
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continue
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}
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tags[string(key)] = string(value)
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}
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i.acc.Add(string(sample.Metric[model.MetricNameLabel]), float64(sample.Value), tags)
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}
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return nil
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}
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func init() {
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plugins.Add("prometheus", func() plugins.Plugin {
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return &Prometheus{}
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})
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}
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