golang 1.8 优雅关闭

// main.go

package main

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

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        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(nil))

    // Wait gorotine print shutdown message
    time.Sleep(time.Second * 5)
    log.Println("done.")
}