优雅重启代码

• 测试优雅重启，获取程序版本内容1.0.7
• 1、老版本代码

package main

import (
    "net/http"

    "github.com/facebookgo/grace/gracehttp"
    "github.com/labstack/echo"
)

func main() {
    // Setup
    e := echo.New()
    e.GET("/", func(c echo.Context) error {
        return c.String(http.StatusOK, "1.0.7")
    })
    e.Server.Addr = ":1323"

    // Serve it like a boss
    e.Logger.Fatal(gracehttp.Serve(e.Server))
}

• 执行老版本测试

curl 127.0.0.1:1321/
1.0.7

• 2、新版本代码

package main

import (
    "net/http"

    "github.com/facebookgo/grace/gracehttp"
    "github.com/labstack/echo"
)

func main() {
    // Setup
    e := echo.New()
    e.GET("/", func(c echo.Context) error {
        return c.String(http.StatusOK, "1.0.8")
    })
    e.Server.Addr = ":1323"

    // Serve it like a boss
    e.Logger.Fatal(gracehttp.Serve(e.Server))
}

Linux编译的程序进行更新

* 注意：当程序服务未kill时，使用FileZilla无法上传更新程序进行覆盖，提示无法启动传输。使用WinSCP即可上传更新程序进行覆盖。

• 1、通过WinSCP上传新版本的更新程序
• 2、ps -aux|grep 程序进程名获取到程序的pid

$ ps -aux|grep test-service 
username      36106  0.0  0.1 713912 12516 pts/0    Sl   13:09   0:00 ./test-service
username      37627  0.0  0.0 112732   972 pts/0    S+   13:17   0:00 grep --color=auto test-service

• 3、kill -USR2 36106，触发服务器正常重启
• 4、执行新版本测试，通过更改返回内容，校验是否优雅重启成功

curl 127.0.0.1:1321/
1.0.8

保持Windows环境能正常日常开发

因grace仅能在Linux环境开发编译，故需通过系统条件编译使能在Windows环境能够正常开发

• 创建Linux编译文件
  start_linux.go

package main

import (
    "github.com/facebookgo/grace/gracehttp"
    "github.com/labstack/echo"
)

// HTTP服务优雅重启
// kill -USR2 pid
func start(e *echo.Echo, port string) {
    e.Server.Addr = port
    // Serve it like a boss
    e.Logger.Fatal(gracehttp.Serve(e.Server))
}

• 创建Windows编译文件
  start_windows.go

package main

import (
    "context"
    "github.com/labstack/echo"
    "log"
    "os"
    "os/signal"
    "syscall"
    "time"
)

// HTTP服务优雅关闭
// kill -HUP pid
func start(e *echo.Echo, port string) {
    go func() {
        if err := e.Start(port); err != nil {
            e.Logger.Info("shutting down the server")
        }
    }()

    // Wait for interrupt signal to gracefully shutdown the server with
    // a timeout of 10 seconds.
    quit := make(chan os.Signal)
    signal.Notify(quit, syscall.SIGKILL, syscall.SIGHUP, os.Interrupt)
    <-quit
    log.Println("Shutdown Server ...")
    ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
    defer cancel()
    if err := e.Shutdown(ctx); err != nil {
        e.Logger.Fatal(err)
    }
    log.Println("Server exiting")
}

main.go

package main

import (
    "net/http"

    "github.com/labstack/echo"
)

func main() {
    // Setup
    e := echo.New()
    e.GET("/", func(c echo.Context) error {
        return c.String(http.StatusOK, "1.0.7")
    })
    start(e, ":1323")
}