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golang 应用热重启的例子 graceful

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我使用的是 gopkg.in/tylerb/graceful 包,

Go: graceful
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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

INI: supervisord conf
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[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:

Go: graceful
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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

Bash: 热重启测试
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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'

本文网址: https://golangnote.com/topic/126.html 转摘请注明来源

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