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server.go
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server.go
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package main
import (
"context"
"net/http"
"time"
"github.com/golang/glog"
"github.com/gorilla/mux"
"github.com/prometheus/client_golang/prometheus"
)
const (
prometheusMetricsServerAddress = "0.0.0.0:9402"
prometheusMetricsServerShutdownTimeout = 10 * time.Second
prometheusMetricsServerReadTimeout = 8 * time.Second
prometheusMetricsServerWriteTimeout = 8 * time.Second
prometheusMetricsServerMaxHeaderBytes = 1 << 20
)
type prometheusMetricsServer struct {
http.Server
}
func prometheusHandler() http.Handler {
return prometheus.Handler()
}
func newPrometheusMetricsServer() *prometheusMetricsServer {
r := mux.NewRouter()
r.Handle("/metrics", prometheusHandler())
// Create server and register prometheus metrics handler
s := &prometheusMetricsServer{
Server: http.Server{
Addr: prometheusMetricsServerAddress,
ReadTimeout: prometheusMetricsServerReadTimeout,
WriteTimeout: prometheusMetricsServerWriteTimeout,
MaxHeaderBytes: prometheusMetricsServerMaxHeaderBytes,
Handler: r,
},
}
return s
}
func (s *prometheusMetricsServer) WaitShutdown(stopCh <-chan struct{}) {
<-stopCh
glog.Info("Stopping Prometheus metrics server...")
ctx, cancel := context.WithTimeout(context.Background(), prometheusMetricsServerShutdownTimeout)
defer cancel()
if err := s.Shutdown(ctx); err != nil {
glog.Errorf("Prometheus metrics server shutdown error: %v", err)
return
}
glog.Info("Prometheus metrics server gracefully stopped")
}
func StartPrometheusMetricsServer(stopCh <-chan struct{}) {
s := newPrometheusMetricsServer()
go func() {
glog.Infof("Listening on http://%s", s.Addr)
if err := s.ListenAndServe(); err != nil {
glog.Errorf("Error running prometheus metrics server: %s", err.Error())
return
}
glog.Infof("Prometheus metrics server exited")
}()
s.WaitShutdown(stopCh)
}