main.go

package main

import (
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"

	"github.com/prometheus/client_golang/prometheus/promhttp"
	metrics "github.com/slok/go-http-metrics/metrics/prometheus"
	"github.com/slok/go-http-metrics/middleware"
	negronimiddleware "github.com/slok/go-http-metrics/middleware/negroni"
	"github.com/urfave/negroni"
)

const (
	srvAddr     = ":8080"
	metricsAddr = ":8081"
)

func main() {
	// Create our middleware.
	mdlw := middleware.New(middleware.Config{
		Recorder: metrics.NewRecorder(metrics.Config{}),
	})

	// Create our router.
	mux := http.NewServeMux()
	mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
		fmt.Fprintf(w, "Hello world!")
	})

	// Create our negroni instance.
	n := negroni.Classic()

	// Add the middleware to negroni.
	n.Use(negronimiddleware.Handler("", mdlw))

	// Finally set our router on negroni.
	n.UseHandler(mux)

	// Serve our handler.
	go func() {
		log.Printf("server listening at %s", srvAddr)
		if err := http.ListenAndServe(srvAddr, n); err != nil {
			log.Panicf("error while serving: %s", err)
		}
	}()

	// Serve our metrics.
	go func() {
		log.Printf("metrics listening at %s", metricsAddr)
		if err := http.ListenAndServe(metricsAddr, promhttp.Handler()); err != nil {
			log.Panicf("error while serving metrics: %s", err)
		}
	}()

	// Wait until some signal is captured.
	sigC := make(chan os.Signal, 1)
	signal.Notify(sigC, syscall.SIGTERM, syscall.SIGINT)
	<-sigC
}