mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
synced 2025-01-06 19:12:19 +00:00
80 lines
2.1 KiB
Go
80 lines
2.1 KiB
Go
package metrics
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import (
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"fmt"
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"net/http"
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"sort"
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"strconv"
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metrics2 "github.com/VictoriaMetrics/metrics"
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"github.com/ledgerwatch/log/v3"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/common/expfmt"
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)
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// Handler returns an HTTP handler which dump metrics in Prometheus format.
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// Output format can be cheched here: https://o11y.tools/metricslint/
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func Handler(reg Registry) http.Handler {
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prometheus.DefaultRegisterer.MustRegister(defaultSet)
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// Gather and pre-sort the metrics to avoid random listings
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var names []string
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reg.Each(func(name string, i interface{}) {
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names = append(names, name)
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})
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sort.Strings(names)
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w.Header().Set("Access-Control-Allow-Origin", "*")
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metrics2.WritePrometheus(w, false)
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contentType := expfmt.Negotiate(r.Header)
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enc := expfmt.NewEncoder(w, contentType)
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mf, err := prometheus.DefaultGatherer.Gather()
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if err != nil {
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return
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}
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for _, m := range mf {
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enc.Encode(m)
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}
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// Aggregate all the metris into a Prometheus collector
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c := newCollector()
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c.buff.WriteRune('\n')
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var typeName string
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var prevTypeName string
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for _, name := range names {
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i := reg.Get(name)
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typeName = stripLabels(name)
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switch m := i.(type) {
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case *metrics2.Counter:
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if m.IsGauge() {
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c.writeGauge(name, m.Get(), typeName != prevTypeName)
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} else {
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c.writeCounter(name, m.Get(), typeName != prevTypeName)
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}
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case *metrics2.Gauge:
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c.writeGauge(name, m, typeName != prevTypeName)
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case *metrics2.FloatCounter:
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c.writeFloatCounter(name, m, typeName != prevTypeName)
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case *metrics2.Histogram:
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c.writeHistogram(name, m, typeName != prevTypeName)
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case *metrics2.Summary:
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c.writeTimer(name, m, typeName != prevTypeName)
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default:
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log.Warn("Unknown Prometheus metric type", "type", fmt.Sprintf("%T", i))
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}
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prevTypeName = typeName
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}
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w.Header().Add("Content-Type", "text/plain")
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w.Header().Add("Content-Length", strconv.Itoa(c.buff.Len()))
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w.Write(c.buff.Bytes())
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})
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}
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