remote cmds exec tool base on grpc

new executor server

    grpcServer := grpc.NewServer()
    // register server.Executor
    apis.RegisterExecutorServer(grpcServer, &server.Executor{})
    // new tcp server
    listener, err := net.Listen("unix", socketPath)
    if err != nil {
        log.Fatalln(err)
    }
    defer listener.Close()
    err = grpcServer.Serve(listener)
    if err != nil {
        log.Fatalln(err)
    }

executor client

same interface with os/exec: Run, Start, Wait, Output, CombinedOutput StdinPipe, StdoutPipe, StderrPipe

    client.Command("pwd").Run()
    client.Command("pwd").Output()
    client.Command("pwd").CombinedOutput()

different error handle

• get exit code

func GetExitStatus(err error) (int, bool) {
    if exiterr, ok := err.(*client.ExitError); ok {
        ws := exiterr.Sys().(syscall.WaitStatus)
        return ws.ExitStatus(), true
    } else {
        return 0, false
    }
}
err := client.Command("pwd").Run()
exitStatus, ok := GetExitStatus(err)

• kill process

cmd := client.Command("pwd")
// ......
err := cmd.Kill()