Add pushgateway support.
Change-Id: I4730b150ac84ae38939b16effaf4b2ad4afa5bc0
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@ -82,7 +82,7 @@ func ExampleGaugeFunc() {
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},
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func() float64 { return float64(runtime.NumGoroutine()) },
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)); err == nil {
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fmt.Println("GaugeFunc 'goroutines_count' registered.\n")
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fmt.Println("GaugeFunc 'goroutines_count' registered.")
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}
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// Note that the count of goroutines is a gauge (and not a counter) as
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// it can go up and down.
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@ -26,6 +26,7 @@ import (
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"hash/fnv"
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"io"
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"net/http"
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"net/url"
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"sort"
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"sync"
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@ -179,6 +180,26 @@ func EnableCollectChecks(b bool) {
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defRegistry.collectChecksEnabled = b
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}
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// Push triggers a metric collection and pushes all collected metrics to the
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// Pushgateway specified by addr. See the Pushgateway documentation for detailed
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// implications of the job and instance parameter. instance can be left
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// empty. The Pushgateway will then use the client's IP number instead. Use just
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// host:port or ip:port ass addr. (Don't add 'http://' or any path.)
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//
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// Note that all previously pushed metrics with the same job and instance will
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// be replaced with the metrics pushed by this call. (It uses HTTP method 'PUT'
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// to push to the Pushgateway.)
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func Push(job, instance, addr string) error {
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return defRegistry.Push(job, instance, addr, "PUT")
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}
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// PushAdd works like Push, but only previously pushed metrics with the same
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// name (and the same job and instance) will be replaced. (It uses HTTP method
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// 'POST' to push to the Pushgateway.)
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func PushAdd(job, instance, addr string) error {
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return defRegistry.Push(job, instance, addr, "POST")
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}
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// encoder is a function that writes a dto.MetricFamily to an io.Writer in a
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// certain encoding. It returns the number of bytes written and any error
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// encountered. Note that ext.WriteDelimited and text.MetricFamilyToText are
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@ -318,6 +339,32 @@ func (r *registry) Unregister(c Collector) bool {
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return true
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}
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func (r *registry) Push(job, instance, addr, method string) error {
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u := fmt.Sprintf("http://%s/metrics/jobs/%s", addr, url.QueryEscape(job))
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if instance != "" {
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u += "/instances/" + url.QueryEscape(instance)
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}
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buf := r.getBuf()
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defer r.giveBuf(buf)
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if _, err := r.writePB(buf, text.WriteProtoDelimited); err != nil {
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if r.panicOnCollectError {
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panic(err)
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}
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return err
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}
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req, err := http.NewRequest(method, u, buf)
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req.Header.Set("Content-Type", DelimitedTelemetryContentType)
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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if resp.StatusCode != 202 {
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return fmt.Errorf("unexpected status code %d while pushing to %s", resp.StatusCode, u)
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}
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return nil
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}
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func (r *registry) ServeHTTP(w http.ResponseWriter, req *http.Request) {
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enc, contentType := chooseEncoder(req)
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buf := r.getBuf()
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