golang 应用热重启的例子 graceful

我使用的是 gopkg.in/tylerb/graceful 包，

package main

import (
    "fmt"
    "net/http"
    "os"
    "time"

    "gopkg.in/tylerb/graceful.v1"
)

var (
    now = time.Now()
)

func main() {
    mux := http.NewServeMux()
    mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        duration, err := time.ParseDuration(r.FormValue("duration"))
        if err != nil {
            http.Error(w, err.Error(), 400)
            return
        }
        time.Sleep(duration)
        fmt.Fprintf(
            w,
            "started at %s slept for %d nanoseconds from pid %d.\n",
            now,
            duration.Nanoseconds(),
            os.Getpid(),
        )
    })

    graceful.Run(":3001", 21*time.Second, mux)
}

supervisord.conf 配置示例

[program:golangn]
;user=root
command = /Users/weis/tmp/graceful2
process_name = golangnote
stopwaitsecs = 22
directory = /Users/weis/tmp
redirect_stderr=true
autostart=true
autorestart=true

需要注意的地方是两个timeout 时间：

graceful.Run(":3001", 21*time.Second, mux)
stopwaitsecs = 22

supervisord.conf 里的时间要比go 脚本里的时间多1 秒。

测试：

curl 'http://localhost:3001/?duration=20s'
curl 'http://localhost:3001/?duration=20s'
curl 'http://localhost:3001/?duration=0s'
supervisorctl restart all
curl 'http://localhost:3001/?duration=0s'