mirror of https://github.com/ethereum/go-ethereum
metrics/prometheus: expose metrics in prometheus format too (#17077)
* metrics/prometheus: added prometheus http server and metrics collector * metrics/prometheus: minor cleanups * metrics/prometheus: named keys instead name in tag * metrics/prometheus: minor typo cleanups, sorted reportpull/19450/head
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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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"strconv" |
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"strings" |
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"github.com/ethereum/go-ethereum/metrics" |
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) |
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var ( |
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typeGaugeTpl = "# TYPE %s gauge\n" |
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typeCounterTpl = "# TYPE %s counter\n" |
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typeSummaryTpl = "# TYPE %s summary\n" |
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keyValueTpl = "%s %v\n\n" |
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keyQuantileTagValueTpl = "%s {quantile=\"%s\"} %v\n\n" |
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) |
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// collector is a collection of byte buffers that aggregate Prometheus reports
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// for different metric types.
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type collector struct { |
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buff *bytes.Buffer |
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} |
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// newCollector createa a new Prometheus metric aggregator.
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func newCollector() *collector { |
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return &collector{ |
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buff: &bytes.Buffer{}, |
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} |
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} |
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func (c *collector) addCounter(name string, m metrics.Counter) { |
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c.writeGaugeCounter(name, m.Count()) |
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} |
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func (c *collector) addGauge(name string, m metrics.Gauge) { |
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c.writeGaugeCounter(name, m.Value()) |
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} |
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func (c *collector) addGaugeFloat64(name string, m metrics.GaugeFloat64) { |
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c.writeGaugeCounter(name, m.Value()) |
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} |
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func (c *collector) addHistogram(name string, m metrics.Histogram) { |
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pv := []float64{0.5, 0.75, 0.95, 0.99, 0.999, 0.9999} |
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ps := m.Percentiles(pv) |
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c.writeSummaryCounter(name, m.Count()) |
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for i := range pv { |
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c.writeSummaryPercentile(name, strconv.FormatFloat(pv[i], 'f', -1, 64), ps[i]) |
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} |
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} |
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func (c *collector) addMeter(name string, m metrics.Meter) { |
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c.writeGaugeCounter(name, m.Count()) |
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} |
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func (c *collector) addTimer(name string, m metrics.Timer) { |
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pv := []float64{0.5, 0.75, 0.95, 0.99, 0.999, 0.9999} |
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ps := m.Percentiles(pv) |
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c.writeSummaryCounter(name, m.Count()) |
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for i := range pv { |
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c.writeSummaryPercentile(name, strconv.FormatFloat(pv[i], 'f', -1, 64), ps[i]) |
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} |
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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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c.writeSummaryCounter(name, len(val)) |
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c.writeSummaryPercentile(name, "0.50", ps[0]) |
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c.writeSummaryPercentile(name, "0.95", ps[1]) |
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c.writeSummaryPercentile(name, "0.99", ps[2]) |
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} |
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func (c *collector) writeGaugeCounter(name string, value interface{}) { |
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name = mutateKey(name) |
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c.buff.WriteString(fmt.Sprintf(typeGaugeTpl, name)) |
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c.buff.WriteString(fmt.Sprintf(keyValueTpl, name, value)) |
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} |
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func (c *collector) writeSummaryCounter(name string, value interface{}) { |
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name = mutateKey(name + "_count") |
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c.buff.WriteString(fmt.Sprintf(typeCounterTpl, name)) |
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c.buff.WriteString(fmt.Sprintf(keyValueTpl, name, value)) |
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} |
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func (c *collector) writeSummaryPercentile(name, p string, value interface{}) { |
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name = mutateKey(name) |
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c.buff.WriteString(fmt.Sprintf(typeSummaryTpl, name)) |
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c.buff.WriteString(fmt.Sprintf(keyQuantileTagValueTpl, name, p, value)) |
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} |
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func mutateKey(key string) string { |
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return strings.Replace(key, "/", "_", -1) |
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} |
@ -0,0 +1,68 @@ |
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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 exposes go-metrics into a Prometheus format.
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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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"sort" |
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"github.com/ethereum/go-ethereum/log" |
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"github.com/ethereum/go-ethereum/metrics" |
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) |
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// Handler returns an 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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// 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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// Aggregate all the metris into a Prometheus collector
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c := newCollector() |
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for _, name := range names { |
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i := reg.Get(name) |
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switch m := i.(type) { |
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case metrics.Counter: |
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c.addCounter(name, m.Snapshot()) |
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case metrics.Gauge: |
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c.addGauge(name, m.Snapshot()) |
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case metrics.GaugeFloat64: |
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c.addGaugeFloat64(name, m.Snapshot()) |
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case metrics.Histogram: |
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c.addHistogram(name, m.Snapshot()) |
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case metrics.Meter: |
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c.addMeter(name, m.Snapshot()) |
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case metrics.Timer: |
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c.addTimer(name, m.Snapshot()) |
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case metrics.ResettingTimer: |
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c.addResettingTimer(name, m.Snapshot()) |
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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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} |
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w.Header().Add("Content-Type", "text/plain") |
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w.Header().Add("Content-Length", fmt.Sprint(c.buff.Len())) |
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w.Write(c.buff.Bytes()) |
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}) |
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} |
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