mirror of https://github.com/ethereum/go-ethereum
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
213 lines
6.5 KiB
213 lines
6.5 KiB
// Hook go-metrics into expvar
|
|
// on any /debug/metrics request, load all vars from the registry into expvar, and execute regular expvar handler
|
|
package exp
|
|
|
|
import (
|
|
"expvar"
|
|
"fmt"
|
|
"net/http"
|
|
"sync"
|
|
|
|
"github.com/ethereum/go-ethereum/log"
|
|
"github.com/ethereum/go-ethereum/metrics"
|
|
"github.com/ethereum/go-ethereum/metrics/prometheus"
|
|
)
|
|
|
|
type exp struct {
|
|
expvarLock sync.Mutex // expvar panics if you try to register the same var twice, so we must probe it safely
|
|
registry metrics.Registry
|
|
}
|
|
|
|
func (exp *exp) expHandler(w http.ResponseWriter, r *http.Request) {
|
|
// load our variables into expvar
|
|
exp.syncToExpvar()
|
|
|
|
// now just run the official expvar handler code (which is not publicly callable, so pasted inline)
|
|
w.Header().Set("Content-Type", "application/json; charset=utf-8")
|
|
fmt.Fprintf(w, "{\n")
|
|
first := true
|
|
expvar.Do(func(kv expvar.KeyValue) {
|
|
if !first {
|
|
fmt.Fprintf(w, ",\n")
|
|
}
|
|
first = false
|
|
fmt.Fprintf(w, "%q: %s", kv.Key, kv.Value)
|
|
})
|
|
fmt.Fprintf(w, "\n}\n")
|
|
}
|
|
|
|
// Exp will register an expvar powered metrics handler with http.DefaultServeMux on "/debug/vars"
|
|
func Exp(r metrics.Registry) {
|
|
h := ExpHandler(r)
|
|
// this would cause a panic:
|
|
// panic: http: multiple registrations for /debug/vars
|
|
// http.HandleFunc("/debug/vars", e.expHandler)
|
|
// haven't found an elegant way, so just use a different endpoint
|
|
http.Handle("/debug/metrics", h)
|
|
http.Handle("/debug/metrics/prometheus", prometheus.Handler(r))
|
|
}
|
|
|
|
// ExpHandler will return an expvar powered metrics handler.
|
|
func ExpHandler(r metrics.Registry) http.Handler {
|
|
e := exp{sync.Mutex{}, r}
|
|
return http.HandlerFunc(e.expHandler)
|
|
}
|
|
|
|
// Setup starts a dedicated metrics server at the given address.
|
|
// This function enables metrics reporting separate from pprof.
|
|
func Setup(address string) {
|
|
m := http.NewServeMux()
|
|
m.Handle("/debug/metrics", ExpHandler(metrics.DefaultRegistry))
|
|
m.Handle("/debug/metrics/prometheus", prometheus.Handler(metrics.DefaultRegistry))
|
|
log.Info("Starting metrics server", "addr", fmt.Sprintf("http://%s/debug/metrics", address))
|
|
go func() {
|
|
if err := http.ListenAndServe(address, m); err != nil {
|
|
log.Error("Failure in running metrics server", "err", err)
|
|
}
|
|
}()
|
|
}
|
|
|
|
func (exp *exp) getInt(name string) *expvar.Int {
|
|
var v *expvar.Int
|
|
exp.expvarLock.Lock()
|
|
p := expvar.Get(name)
|
|
if p != nil {
|
|
v = p.(*expvar.Int)
|
|
} else {
|
|
v = new(expvar.Int)
|
|
expvar.Publish(name, v)
|
|
}
|
|
exp.expvarLock.Unlock()
|
|
return v
|
|
}
|
|
|
|
func (exp *exp) getFloat(name string) *expvar.Float {
|
|
var v *expvar.Float
|
|
exp.expvarLock.Lock()
|
|
p := expvar.Get(name)
|
|
if p != nil {
|
|
v = p.(*expvar.Float)
|
|
} else {
|
|
v = new(expvar.Float)
|
|
expvar.Publish(name, v)
|
|
}
|
|
exp.expvarLock.Unlock()
|
|
return v
|
|
}
|
|
|
|
func (exp *exp) getInfo(name string) *expvar.String {
|
|
var v *expvar.String
|
|
exp.expvarLock.Lock()
|
|
p := expvar.Get(name)
|
|
if p != nil {
|
|
v = p.(*expvar.String)
|
|
} else {
|
|
v = new(expvar.String)
|
|
expvar.Publish(name, v)
|
|
}
|
|
exp.expvarLock.Unlock()
|
|
return v
|
|
}
|
|
|
|
func (exp *exp) publishCounter(name string, metric metrics.Counter) {
|
|
v := exp.getInt(name)
|
|
v.Set(metric.Count())
|
|
}
|
|
|
|
func (exp *exp) publishCounterFloat64(name string, metric metrics.CounterFloat64) {
|
|
v := exp.getFloat(name)
|
|
v.Set(metric.Count())
|
|
}
|
|
|
|
func (exp *exp) publishGauge(name string, metric metrics.Gauge) {
|
|
v := exp.getInt(name)
|
|
v.Set(metric.Value())
|
|
}
|
|
func (exp *exp) publishGaugeFloat64(name string, metric metrics.GaugeFloat64) {
|
|
exp.getFloat(name).Set(metric.Value())
|
|
}
|
|
|
|
func (exp *exp) publishGaugeInfo(name string, metric metrics.GaugeInfo) {
|
|
exp.getInfo(name).Set(metric.Value().String())
|
|
}
|
|
|
|
func (exp *exp) publishHistogram(name string, metric metrics.Histogram) {
|
|
h := metric.Snapshot()
|
|
ps := h.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
|
|
exp.getInt(name + ".count").Set(h.Count())
|
|
exp.getFloat(name + ".min").Set(float64(h.Min()))
|
|
exp.getFloat(name + ".max").Set(float64(h.Max()))
|
|
exp.getFloat(name + ".mean").Set(h.Mean())
|
|
exp.getFloat(name + ".std-dev").Set(h.StdDev())
|
|
exp.getFloat(name + ".50-percentile").Set(ps[0])
|
|
exp.getFloat(name + ".75-percentile").Set(ps[1])
|
|
exp.getFloat(name + ".95-percentile").Set(ps[2])
|
|
exp.getFloat(name + ".99-percentile").Set(ps[3])
|
|
exp.getFloat(name + ".999-percentile").Set(ps[4])
|
|
}
|
|
|
|
func (exp *exp) publishMeter(name string, metric metrics.Meter) {
|
|
m := metric.Snapshot()
|
|
exp.getInt(name + ".count").Set(m.Count())
|
|
exp.getFloat(name + ".one-minute").Set(m.Rate1())
|
|
exp.getFloat(name + ".five-minute").Set(m.Rate5())
|
|
exp.getFloat(name + ".fifteen-minute").Set(m.Rate15())
|
|
exp.getFloat(name + ".mean").Set(m.RateMean())
|
|
}
|
|
|
|
func (exp *exp) publishTimer(name string, metric metrics.Timer) {
|
|
t := metric.Snapshot()
|
|
ps := t.Percentiles([]float64{0.5, 0.75, 0.95, 0.99, 0.999})
|
|
exp.getInt(name + ".count").Set(t.Count())
|
|
exp.getFloat(name + ".min").Set(float64(t.Min()))
|
|
exp.getFloat(name + ".max").Set(float64(t.Max()))
|
|
exp.getFloat(name + ".mean").Set(t.Mean())
|
|
exp.getFloat(name + ".std-dev").Set(t.StdDev())
|
|
exp.getFloat(name + ".50-percentile").Set(ps[0])
|
|
exp.getFloat(name + ".75-percentile").Set(ps[1])
|
|
exp.getFloat(name + ".95-percentile").Set(ps[2])
|
|
exp.getFloat(name + ".99-percentile").Set(ps[3])
|
|
exp.getFloat(name + ".999-percentile").Set(ps[4])
|
|
exp.getFloat(name + ".one-minute").Set(t.Rate1())
|
|
exp.getFloat(name + ".five-minute").Set(t.Rate5())
|
|
exp.getFloat(name + ".fifteen-minute").Set(t.Rate15())
|
|
exp.getFloat(name + ".mean-rate").Set(t.RateMean())
|
|
}
|
|
|
|
func (exp *exp) publishResettingTimer(name string, metric metrics.ResettingTimer) {
|
|
t := metric.Snapshot()
|
|
ps := t.Percentiles([]float64{50, 75, 95, 99})
|
|
exp.getInt(name + ".count").Set(int64(len(t.Values())))
|
|
exp.getFloat(name + ".mean").Set(t.Mean())
|
|
exp.getInt(name + ".50-percentile").Set(ps[0])
|
|
exp.getInt(name + ".75-percentile").Set(ps[1])
|
|
exp.getInt(name + ".95-percentile").Set(ps[2])
|
|
exp.getInt(name + ".99-percentile").Set(ps[3])
|
|
}
|
|
|
|
func (exp *exp) syncToExpvar() {
|
|
exp.registry.Each(func(name string, i interface{}) {
|
|
switch i := i.(type) {
|
|
case metrics.Counter:
|
|
exp.publishCounter(name, i)
|
|
case metrics.CounterFloat64:
|
|
exp.publishCounterFloat64(name, i)
|
|
case metrics.Gauge:
|
|
exp.publishGauge(name, i)
|
|
case metrics.GaugeFloat64:
|
|
exp.publishGaugeFloat64(name, i)
|
|
case metrics.GaugeInfo:
|
|
exp.publishGaugeInfo(name, i)
|
|
case metrics.Histogram:
|
|
exp.publishHistogram(name, i)
|
|
case metrics.Meter:
|
|
exp.publishMeter(name, i)
|
|
case metrics.Timer:
|
|
exp.publishTimer(name, i)
|
|
case metrics.ResettingTimer:
|
|
exp.publishResettingTimer(name, i)
|
|
default:
|
|
panic(fmt.Sprintf("unsupported type for '%s': %T", name, i))
|
|
}
|
|
})
|
|
}
|
|
|