Golang http server with gracefull exit.

gracefull_webserver.go

package main

import (
	"context"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"
)

func main() {

	router := http.NewServeMux()
	router.Handle("/", index())

	listenAddr := ":8080"

	srv := http.Server{
		Addr:    listenAddr,
		Handler: router,
	}

	done := make(chan bool)
	quit := make(chan os.Signal, 1)
	signal.Notify(quit, syscall.SIGINT)
	signal.Notify(quit, syscall.SIGTERM)

	go func() {
		<-quit

		ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
		defer cancel()

		// Keep Alive disabled when server is shutting down
		srv.SetKeepAlivesEnabled(false)

		if err := srv.Shutdown(ctx); err != nil {
			log.Printf("failed to shutting down gracefully: %v\n", err)
		}
		close(done)
	}()

	if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
		log.Printf("can't listend on address: %s, err: %+v\n", listenAddr, err)
	}

	<-done
	fmt.Println("server stopped gracefully")
}

func index() http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// Put 3 second sleep here for testing, is it still serving http request after interupt signal
		time.Sleep(3 * time.Second)
		fmt.Fprintln(w, "hello there")
	})
}