github.com/go-xe2/third@v1.0.3/golang.org/x/sys/windows/svc/example/service.go (about)

     1  // Copyright 2012 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // +build windows
     6  
     7  package main
     8  
     9  import (
    10  	"fmt"
    11  	"strings"
    12  	"time"
    13  
    14  	"github.com/go-xe2/third/golang.org/x/sys/windows/svc"
    15  	"github.com/go-xe2/third/golang.org/x/sys/windows/svc/debug"
    16  	"github.com/go-xe2/third/golang.org/x/sys/windows/svc/eventlog"
    17  )
    18  
    19  var elog debug.Log
    20  
    21  type myservice struct{}
    22  
    23  func (m *myservice) Execute(args []string, r <-chan svc.ChangeRequest, changes chan<- svc.Status) (ssec bool, errno uint32) {
    24  	const cmdsAccepted = svc.AcceptStop | svc.AcceptShutdown | svc.AcceptPauseAndContinue
    25  	changes <- svc.Status{State: svc.StartPending}
    26  	fasttick := time.Tick(500 * time.Millisecond)
    27  	slowtick := time.Tick(2 * time.Second)
    28  	tick := fasttick
    29  	changes <- svc.Status{State: svc.Running, Accepts: cmdsAccepted}
    30  	elog.Info(1, strings.Join(args, "-"))
    31  loop:
    32  	for {
    33  		select {
    34  		case <-tick:
    35  			beep()
    36  			elog.Info(1, "beep")
    37  		case c := <-r:
    38  			switch c.Cmd {
    39  			case svc.Interrogate:
    40  				changes <- c.CurrentStatus
    41  				// Testing deadlock from https://code.google.com/p/winsvc/issues/detail?id=4
    42  				time.Sleep(100 * time.Millisecond)
    43  				changes <- c.CurrentStatus
    44  			case svc.Stop, svc.Shutdown:
    45  				break loop
    46  			case svc.Pause:
    47  				changes <- svc.Status{State: svc.Paused, Accepts: cmdsAccepted}
    48  				tick = slowtick
    49  			case svc.Continue:
    50  				changes <- svc.Status{State: svc.Running, Accepts: cmdsAccepted}
    51  				tick = fasttick
    52  			default:
    53  				elog.Error(1, fmt.Sprintf("unexpected control request #%d", c))
    54  			}
    55  		}
    56  	}
    57  	changes <- svc.Status{State: svc.StopPending}
    58  	return
    59  }
    60  
    61  func runService(name string, isDebug bool) {
    62  	var err error
    63  	if isDebug {
    64  		elog = debug.New(name)
    65  	} else {
    66  		elog, err = eventlog.Open(name)
    67  		if err != nil {
    68  			return
    69  		}
    70  	}
    71  	defer elog.Close()
    72  
    73  	elog.Info(1, fmt.Sprintf("starting %s service", name))
    74  	run := svc.Run
    75  	if isDebug {
    76  		run = debug.Run
    77  	}
    78  	err = run(name, &myservice{})
    79  	if err != nil {
    80  		elog.Error(1, fmt.Sprintf("%s service failed: %v", name, err))
    81  		return
    82  	}
    83  	elog.Info(1, fmt.Sprintf("%s service stopped", name))
    84  }