【Golang】程序通过服务的形式常驻后台

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【Golang】程序通过服务的形式常驻后台

2019-11-07

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Warning

此教程只在Linux和Windows上试验过，Mac可自行实验

一般使用命令带&实现后台运行，或使用守护进程来实现后台运行。其实golang自己也可以实现以服务的形式常驻后台。

需要的库#

这里使用库:github.com/kardianos/service

其中golang.org/x/...的库国内很难下载，将golang.org/x/替换为github.com/golang/进行下载，最后将github.com->golang文件目录替换为golang.org->x文件目录即可。

接口定义#

这个库有两个接口定义：

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type Service interface {
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  // Run should be called shortly after the program entry point.
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  // After Interface.Stop has finished running, Run will stop blocking.
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  // After Run stops blocking, the program must exit shortly after.
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  Run() error
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  // Start signals to the OS service manager the given service should start.
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  Start() error
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  // Stop signals to the OS service manager the given service should stop.
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  Stop() error
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  // Restart signals to the OS service manager the given service should stop then start.
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  Restart() error
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  // Install setups up the given service in the OS service manager. This may require
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  // greater rights. Will return an error if it is already installed.
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  Install() error
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  // Uninstall removes the given service from the OS service manager. This may require
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  // greater rights. Will return an error if the service is not present.
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  Uninstall() error
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  // Opens and returns a system logger. If the user program is running
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  // interactively rather then as a service, the returned logger will write to
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  // os.Stderr. If errs is non-nil errors will be sent on errs as well as
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  // returned from Logger's functions.
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  Logger(errs chan<- error) (Logger, error)
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  // SystemLogger opens and returns a system logger. If errs is non-nil errors
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  // will be sent on errs as well as returned from Logger's functions.
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  SystemLogger(errs chan<- error) (Logger, error)
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  // String displays the name of the service. The display name if present,
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  // otherwise the name.
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  String() string
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}

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type Interface interface {
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  // Start provides a place to initiate the service. The service doesn't not
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  // signal a completed start until after this function returns, so the
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  // Start function must not take more then a few seconds at most.
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  Start(s Service) error
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  // Stop provides a place to clean up program execution before it is terminated.
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  // It should not take more then a few seconds to execute.
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  // Stop should not call os.Exit directly in the function.
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  Stop(s Service) error
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}

这里只需实现start和stop接口就行

0x01 简单实例#

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type program struct{}
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func (p *program) Start(s service.Service) error {
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    log.Println("开始服务")
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    go p.run()
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    return nil
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}
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func (p *program) Stop(s service.Service) error {
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    log.Println("停止服务")
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    return nil
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}
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func (p *program) run() {
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    // 这里放置程序要执行的代码……
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}
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func main(){
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//服务初始化
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    //服务的配置信息
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    cfg := &service.Config{
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        Name:        "simple",
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        DisplayName: "a simple service",
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        Description: "This is an example Go service.",
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    }
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    // Interface 接口
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    prg := &program{}
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    // 构建服务对象
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    s, err := service.New(prg, cfg)
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    if err != nil {
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        log.Fatal(err)
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    }
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    // logger 用于记录系统日志
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    logger, err := s.Logger(nil)
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    if err != nil {
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        log.Fatal(err)
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    }
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    if len(os.Args) == 2 { //如果有命令则执行
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        err = service.Control(s, os.Args[1])
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        if err != nil {
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            log.Fatal(err)
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        }
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    } else { //否则说明是方法启动了
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        err = s.Run()
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        if err != nil {
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            logger.Error(err)
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        }
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    }
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    if err != nil {
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        logger.Error(err)
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    }
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}

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【Golang】程序通过服务的形式常驻后台

https://rehtt.com/posts/212/

作者

Rehtt

发布于

2019-11-07

许可协议

CC BY-NC-SA 4.0

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