監控HTTP服務程序腳本：

package main

import (
    "strings"
    "io/ioutil"
    "net/http"
    "fmt"
    "time"
    "os/exec"
    "path/filepath"
    "gopkg.in/gomail.v2"
    "os"
)

func main() {

    error_count := 0
    url := "http://127.0.0.1:10240/watch_api"
    server_path := "/service/online/game_service
 
"

    //檢測文件路徑是否正確
    if false == file_exist(server_path) {
        fmt.Printf("文件路徑不存在: %s，請檢查後重試。\n",server_path)
        return
    }

    for {
        time.Sleep(5 * time.Second)

        if false == check(url,"Time") {
            error_count += 1
        } else {
            error_count 
 
= 0
        }
        if error_count >= 3 {
            //啟動服務
            if false == start_server(server_path) {
                send_mail(fmt.Sprintf("啟動服務失敗！！！請盡快查看！！！(%s)",server_path))
                break
            } else {
                send_mail(fmt.Sprintf("啟動服務成功！(%s)",server_path))
                time.Sleep(
 
30 * time.Second)
                error_count = 0
            }
        }
    }
    fmt.Printf("啟動服務失敗！守護程序退出。\n\n")
}

//檢測某個HTTP鏈接請求，返回值是否包括指定字符串
func check(url string, ret_contain string) bool {
    res, err := http.Post(url, "application/json;charset=utf-8", strings.NewReader(""))

    if err != nil {
        fmt.Printf("error: %s\ttime: %s\n",err.Error(),time.Now().Format("2006-01-02 15:04:05"))
        return false
    }

    result, err := ioutil.ReadAll(res.Body)
    defer res.Body.Close()
    if err != nil {
        fmt.Printf("error: %s\ttime: %s\n",err.Error(),time.Now().Format("2006-01-02 15:04:05"))
        return false
    }

    if false == strings.Contains(string(result),ret_contain)  {
        fmt.Printf("error: %s\ttime: %s\n","Dont Contain `Time`: " + string(result),time.Now().Format("2006-01-02 15:04:05"))
        return false
    }
    return true
}

//啟動服務
func start_server(server_path string) bool {
    filename := filepath.Base(server_path)

    cmd_kill := fmt.Sprintf("killall -9 %s", filename)
    _, err := exec.Command("sh", "-c", cmd_kill).Output()
    if err != nil {
        fmt.Printf("可忽略的命令失敗! (cmd: %s\terror: %s)\n", cmd_kill, err.Error())
        //return false
    }

    cmd_start := fmt.Sprintf("nohup %s 1>/dev/null 2>/dev/null  &", server_path)
    _, err = exec.Command("sh", "-c", cmd_start).Output()
    if err != nil {
        fmt.Printf("cmd.Output Error! (cmd: %s\terror: %s)\n", cmd_start, err.Error())
        return false
    }
    fmt.Printf("啟動服務 %s 成功，time: %s\n\n",server_path,time.Now().Format("2006-01-02 15:04:05"))
    return true
}

func send_mail(content string) {
    defer func() {
        if err := recover(); err != nil {
            fmt.Printf("發送郵件異常，time: %s\n",time.Now().Format("2006-01-02 15:04:05"))
        }
    }()

    m := gomail.NewMessage()
    m.SetAddressHeader("From", "[email protected]", "[email protected]")  // 發件人
    m.SetHeader("To",  // 收件人
        m.FormatAddress("[email protected]", "輕典"),
    )
    m.SetHeader("Subject", "服務器故障")  // 主題
    m.SetBody("text/html", content)  // 正文

    d := gomail.NewDialer("smtp.163.com", 25, "[email protected]", "123456")  // 發送郵件服務器、端口、發件人賬號、發件人密碼
    if err := d.DialAndSend(m); err != nil {
        fmt.Printf("發送郵件失敗，time: %s\n",time.Now().Format("2006-01-02 15:04:05"))
    } else {
        fmt.Printf("發送郵件成功，time: %s\n",time.Now().Format("2006-01-02 15:04:05"))
    }
}

func file_exist(path string) bool {
    if stat, err := os.Stat(path); err != nil {
        if os.IsNotExist(err) {
            return false
        } else {
            return false
        }
    } else {
        if stat.IsDir() {
            return false
        } else {
            return true
        }
    }
}

監控守護腳本