service.go

//go:generate

//  This file is part of ezBastion.
//     ezBastion is free software: you can redistribute it and/or modify
//     it under the terms of the GNU Affero General Public License as published by
//     the Free Software Foundation, either version 3 of the License, or
//     (at your option) any later version.
//     ezBastion is distributed in the hope that it will be useful,
//     but WITHOUT ANY WARRANTY; without even the implied warranty of
//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//     GNU Affero General Public License for more details.
//     You should have received a copy of the GNU Affero General Public License
//     along with ezBastion.  If not, see <https://www.gnu.org/licenses/>.

package main

import (
	"fmt"
	"time"

	"golang.org/x/sys/windows/svc"
	"golang.org/x/sys/windows/svc/debug"
	"golang.org/x/sys/windows/svc/eventlog"
)

var elog debug.Log

type myservice struct{}

func (m *myservice) Execute(args []string, r <-chan svc.ChangeRequest, changes chan<- svc.Status) (ssec bool, errno uint32) {
	const cmdsAccepted = svc.AcceptStop | svc.AcceptShutdown
	changes <- svc.Status{State: svc.StartPending}
	// fasttick := time.Tick(500 * time.Millisecond)
	// slowtick := time.Tick(2 * time.Second)
	// tick := fasttick
	changes <- svc.Status{State: svc.Running, Accepts: cmdsAccepted}
	serverchan := make(chan bool)
	go mainGin(&serverchan)
loop:
	for {
		select {
		// case <-tick:
		// 	mainGin()
		// 	elog.Info(1, "ezb start")
		case c := <-r:
			switch c.Cmd {
			case svc.Interrogate:
				changes <- c.CurrentStatus
				// Testing deadlock from https://code.google.com/p/winsvc/issues/detail?id=4
				time.Sleep(100 * time.Millisecond)
				changes <- c.CurrentStatus
			case svc.Stop, svc.Shutdown:
				close(serverchan)
				break loop
			// case svc.Pause:
			// 	changes <- svc.Status{State: svc.Paused, Accepts: cmdsAccepted}
			// 	tick = slowtick
			// case svc.Continue:
			// 	changes <- svc.Status{State: svc.Running, Accepts: cmdsAccepted}
			// 	tick = fasttick
			default:
				elog.Error(1, fmt.Sprintf("unexpected control request #%d", c))
			}
		}
	}
	changes <- svc.Status{State: svc.StopPending}
	return
}

func runService(name string, isDebug bool) {
	var err error
	if isDebug {
		elog = debug.New(name)
	} else {
		elog, err = eventlog.Open(name)
		if err != nil {
			return
		}
	}
	defer elog.Close()

	elog.Info(1, fmt.Sprintf("starting %s service", name))
	run := svc.Run
	if isDebug {
		run = debug.Run
	}
	err = run(name, &myservice{})
	if err != nil {
		elog.Error(1, fmt.Sprintf("%s service failed: %v", name, err))
		return
	}
	elog.Info(1, fmt.Sprintf("%s service stopped", name))
}