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// Copyright 2019 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package prometheus
import (
"bytes"
"fmt"
"strconv"
"strings"
"github.com/ethereum/go-ethereum/metrics"
)
var (
typeGaugeTpl = "# TYPE %s gauge\n"
typeCounterTpl = "# TYPE %s counter\n"
typeSummaryTpl = "# TYPE %s summary\n"
keyValueTpl = "%s %v\n\n"
keyQuantileTagValueTpl = "%s {quantile=\"%s\"} %v\n\n"
)
// collector is a collection of byte buffers that aggregate Prometheus reports
// for different metric types.
type collector struct {
buff *bytes.Buffer
}
// newCollector createa a new Prometheus metric aggregator.
func newCollector() *collector {
return &collector{
buff: &bytes.Buffer{},
}
}
func (c *collector) addCounter(name string, m metrics.Counter) {
c.writeGaugeCounter(name, m.Count())
}
func (c *collector) addGauge(name string, m metrics.Gauge) {
c.writeGaugeCounter(name, m.Value())
}
func (c *collector) addGaugeFloat64(name string, m metrics.GaugeFloat64) {
c.writeGaugeCounter(name, m.Value())
}
func (c *collector) addHistogram(name string, m metrics.Histogram) {
pv := []float64{0.5, 0.75, 0.95, 0.99, 0.999, 0.9999}
ps := m.Percentiles(pv)
c.writeSummaryCounter(name, m.Count())
for i := range pv {
c.writeSummaryPercentile(name, strconv.FormatFloat(pv[i], 'f', -1, 64), ps[i])
}
}
func (c *collector) addMeter(name string, m metrics.Meter) {
c.writeGaugeCounter(name, m.Count())
}
func (c *collector) addTimer(name string, m metrics.Timer) {
pv := []float64{0.5, 0.75, 0.95, 0.99, 0.999, 0.9999}
ps := m.Percentiles(pv)
c.writeSummaryCounter(name, m.Count())
for i := range pv {
c.writeSummaryPercentile(name, strconv.FormatFloat(pv[i], 'f', -1, 64), ps[i])
}
}
func (c *collector) addResettingTimer(name string, m metrics.ResettingTimer) {
if len(m.Values()) <= 0 {
return
}
ps := m.Percentiles([]float64{50, 95, 99})
val := m.Values()
c.writeSummaryCounter(name, len(val))
c.writeSummaryPercentile(name, "0.50", ps[0])
c.writeSummaryPercentile(name, "0.95", ps[1])
c.writeSummaryPercentile(name, "0.99", ps[2])
}
func (c *collector) writeGaugeCounter(name string, value interface{}) {
name = mutateKey(name)
c.buff.WriteString(fmt.Sprintf(typeGaugeTpl, name))
c.buff.WriteString(fmt.Sprintf(keyValueTpl, name, value))
}
func (c *collector) writeSummaryCounter(name string, value interface{}) {
name = mutateKey(name + "_count")
c.buff.WriteString(fmt.Sprintf(typeCounterTpl, name))
c.buff.WriteString(fmt.Sprintf(keyValueTpl, name, value))
}
func (c *collector) writeSummaryPercentile(name, p string, value interface{}) {
name = mutateKey(name)
c.buff.WriteString(fmt.Sprintf(typeSummaryTpl, name))
c.buff.WriteString(fmt.Sprintf(keyQuantileTagValueTpl, name, p, value))
}
func mutateKey(key string) string {
return strings.Replace(key, "/", "_", -1)
}
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