mirror of
https://github.com/ethereum/go-ethereum.git
synced 2026-08-20 10:52:25 +00:00
metrics/prometheus: added prometheus http server and metrics collector
This commit is contained in:
Maxim Krasilnikov
Péter Szilágyi
parent
74acde4b08
commit
ae5c0fc0e4
3 changed files with 254 additions and 0 deletions
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@ -9,6 +9,7 @@ import (
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"sync"
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"github.com/ethereum/go-ethereum/metrics"
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"github.com/ethereum/go-ethereum/metrics/prometheus"
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)
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type exp struct {
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@ -42,6 +43,7 @@ func Exp(r metrics.Registry) {
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// http.HandleFunc("/debug/vars", e.expHandler)
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// haven't found an elegant way, so just use a different endpoint
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http.Handle("/debug/metrics", h)
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http.Handle("/debug/metrics/prometheus", prometheus.Handler(r))
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}
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// ExpHandler will return an expvar powered metrics handler.
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188
metrics/prometheus/collector.go
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188
metrics/prometheus/collector.go
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@ -0,0 +1,188 @@
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// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package prometheus
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import (
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"bytes"
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"fmt"
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"sync"
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"github.com/ethereum/go-ethereum/metrics"
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)
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var (
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countersKey = []byte("counters")
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gaugesKey = []byte("gauges")
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metersKey = []byte("meters")
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histogramsKey = []byte("histograms")
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timersKey = []byte("timers")
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resettingTimersKey = []byte("resettingTimers")
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countersHeader = []byte("# HELP counters is set of geth counters\n# TYPE counters gauge\n")
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gaugesHeader = []byte("# HELP gauges is set of geth gauges\n# TYPE gauges gauge\n")
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meterHeader = []byte("# HELP meters is set of geth meters\n# TYPE meters counter\n")
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histogramHeader = []byte("# HELP histograms is set of geth histograms\n# TYPE histograms summary\n")
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timerHeader = []byte("# HELP timers is set of geth timers\n# TYPE timers summary\n")
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resettingTimerHeader = []byte("# HELP resetting_timers is set of geth resetting timers\n# TYPE resetting_timers summary\n")
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counterSuffix = []byte("_count")
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nameTagTemplate = "{name=\"%s\"} %v\n"
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nameQuantileTagTemplate = "{name=\"%s\",quantile=\"%s\"} %v\n"
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)
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var bufPool sync.Pool
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func getBuf() *bytes.Buffer {
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buf := bufPool.Get()
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if buf == nil {
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return &bytes.Buffer{}
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}
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return buf.(*bytes.Buffer)
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}
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func giveBuf(buf *bytes.Buffer) {
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buf.Reset()
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bufPool.Put(buf)
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}
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type collector struct {
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counters *bytes.Buffer
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gauges *bytes.Buffer
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histograms *bytes.Buffer
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meters *bytes.Buffer
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timers *bytes.Buffer
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resettingTimers *bytes.Buffer
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}
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func newCollector() *collector {
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return &collector{
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counters: getBuf(),
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gauges: getBuf(),
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histograms: getBuf(),
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meters: getBuf(),
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timers: getBuf(),
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resettingTimers: getBuf(),
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}
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}
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func (c *collector) reset() {
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giveBuf(c.counters)
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giveBuf(c.gauges)
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giveBuf(c.histograms)
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giveBuf(c.meters)
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giveBuf(c.timers)
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giveBuf(c.resettingTimers)
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}
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func (c *collector) result() *bytes.Buffer {
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buf := getBuf()
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if c.counters.Len() > 0 {
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buf.Write(countersHeader)
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buf.Write(c.counters.Bytes())
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}
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if c.gauges.Len() > 0 {
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buf.Write(gaugesHeader)
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buf.Write(c.gauges.Bytes())
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}
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if c.meters.Len() > 0 {
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buf.Write(meterHeader)
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buf.Write(c.meters.Bytes())
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}
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if c.histograms.Len() > 0 {
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buf.Write(histogramHeader)
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buf.Write(c.histograms.Bytes())
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}
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if c.timers.Len() > 0 {
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buf.Write(timerHeader)
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buf.Write(c.timers.Bytes())
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}
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if c.resettingTimers.Len() > 0 {
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buf.Write(resettingTimerHeader)
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buf.Write(c.resettingTimers.Bytes())
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}
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return buf
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}
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func (c *collector) addCounter(name string, m metrics.Counter) {
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writeGuageCounter(c.counters, countersKey, name, m.Count())
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}
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func (c *collector) addGuage(name string, m metrics.Gauge) {
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writeGuageCounter(c.gauges, gaugesKey, name, m.Value())
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}
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func (c *collector) addGuageFloat64(name string, m metrics.GaugeFloat64) {
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writeGuageCounter(c.gauges, gaugesKey, name, m.Value())
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}
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func (c *collector) addHistogram(name string, m metrics.Histogram) {
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ps := m.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999, 0.9999})
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writeSummaryCounter(c.histograms, histogramsKey, name, m.Count())
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writeSummaryPercentile(c.histograms, histogramsKey, name, "0.5", ps[0])
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writeSummaryPercentile(c.histograms, histogramsKey, name, "0.75", ps[1])
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writeSummaryPercentile(c.histograms, histogramsKey, name, "0.95", ps[2])
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writeSummaryPercentile(c.histograms, histogramsKey, name, "0.99", ps[3])
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writeSummaryPercentile(c.histograms, histogramsKey, name, "0.999", ps[4])
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writeSummaryPercentile(c.histograms, histogramsKey, name, "0.9999", ps[5])
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}
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func (c *collector) addMeter(name string, m metrics.Meter) {
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writeGuageCounter(c.meters, metersKey, name, m.Count())
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}
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func (c *collector) addTimer(name string, m metrics.Timer) {
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ps := m.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999, 0.9999})
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writeSummaryCounter(c.timers, timersKey, name, m.Count())
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writeSummaryPercentile(c.timers, timersKey, name, "0.50", ps[0])
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writeSummaryPercentile(c.timers, timersKey, name, "0.75", ps[1])
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writeSummaryPercentile(c.timers, timersKey, name, "0.95", ps[2])
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writeSummaryPercentile(c.timers, timersKey, name, "0.99", ps[3])
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writeSummaryPercentile(c.timers, timersKey, name, "0.999", ps[4])
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writeSummaryPercentile(c.timers, timersKey, name, "0.9999", ps[5])
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}
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func (c *collector) addResettingTimer(name string, m metrics.ResettingTimer) {
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if len(m.Values()) <= 0 {
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return
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}
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ps := m.Percentiles([]float64{50, 95, 99})
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val := m.Values()
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writeSummaryCounter(c.resettingTimers, resettingTimersKey, name, len(val))
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writeSummaryPercentile(c.resettingTimers, resettingTimersKey, name, "0.50", ps[0])
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writeSummaryPercentile(c.resettingTimers, resettingTimersKey, name, "0.95", ps[1])
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writeSummaryPercentile(c.resettingTimers, resettingTimersKey, name, "0.99", ps[2])
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}
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func writeGuageCounter(buf *bytes.Buffer, key []byte, name string, value interface{}) {
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buf.Write(key)
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buf.WriteString(fmt.Sprintf(nameTagTemplate, name, value))
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}
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func writeSummaryCounter(buf *bytes.Buffer, key []byte, name string, value interface{}) {
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buf.Write(append(key, counterSuffix...))
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buf.WriteString(fmt.Sprintf(nameTagTemplate, name, value))
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}
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func writeSummaryPercentile(buf *bytes.Buffer, key []byte, name, p string, value interface{}) {
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buf.Write(key)
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buf.WriteString(fmt.Sprintf(nameQuantileTagTemplate, name, p, value))
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}
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64
metrics/prometheus/handler.go
Normal file
64
metrics/prometheus/handler.go
Normal file
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@ -0,0 +1,64 @@
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// Copyright 2019 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package prometheus
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import (
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"fmt"
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"net/http"
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"github.com/ethereum/go-ethereum/metrics"
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)
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// Handler returns http handler which dump metrics in prometheus format
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func Handler(reg metrics.Registry) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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c := newCollector()
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defer c.reset()
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reg.Each(func(name string, i interface{}) {
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switch m := i.(type) {
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case metrics.Counter:
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ms := m.Snapshot()
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c.addCounter(name, ms)
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case metrics.Gauge:
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ms := m.Snapshot()
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c.addGuage(name, ms)
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case metrics.GaugeFloat64:
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ms := m.Snapshot()
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c.addGuageFloat64(name, ms)
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case metrics.Histogram:
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ms := m.Snapshot()
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c.addHistogram(name, ms)
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case metrics.Meter:
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ms := m.Snapshot()
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c.addMeter(name, ms)
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case metrics.Timer:
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ms := m.Snapshot()
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c.addTimer(name, ms)
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case metrics.ResettingTimer:
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ms := m.Snapshot()
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c.addResettingTimer(name, ms)
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}
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})
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res := c.result()
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defer giveBuf(res)
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w.Header().Add("Content-Type", "text/plain")
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w.Header().Add("Content-Length", fmt.Sprint(res.Len()))
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w.Write(res.Bytes())
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})
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}
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