go http server graceful exit

今天做了一个go语音的http server优雅退出的测试实验

package main

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

func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		t:=time.NewTimer(6 * time.Second)
		L: for {
			time.Sleep(1*time.Second)
			select {
			case <- t.C:
				fmt.Println("\ntime out===============================")
				break L
			default:
				fmt.Println("i am doing job")
			}
		}
		fmt.Fprintf(w, "Hello World, %v\n", time.Now())
	})

	s := &http.Server{
		Addr:           ":8080",
		Handler:        http.DefaultServeMux,
		ReadTimeout:    10 * time.Second,
		WriteTimeout:   10 * time.Second,
		MaxHeaderBytes: 1 << 20,
	}

	go func() {
		log.Println(s.ListenAndServe())
		log.Println("server shutdown")
	}()

	// Handle SIGINT and SIGTERM.
	ch := make(chan os.Signal)
	signal.Notify(ch, syscall.SIGINT, syscall.SIGTERM)
	log.Println(<-ch)

	// Stop the service gracefully.
	log.Println(s.Shutdown(context.Background()))

	// Wait gorotine print shutdown message
	log.Println("done.")
}

 

在正常访问服务的时候，会一直打印出 i am doing job, 并在6s之后返回数据

curl http://localhost:8080/

 

试一下，6s没到，就把服务给停掉，看服务能否优雅退出

服务还是能优雅退出

证明go1.8版本的 server.shutdown(context) 就考虑了优雅退出，只需要调用就好了

进一步需要思考的问题：在使用这个shutdown函数的时候这个context传什么？nil 还是Background（）还是其他？