storj/cmd/storagenode-updater/main_windows.go

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// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.
// Implements support for running the storagenode-updater as a Windows Service.
//
// The Windows Service can be created with sc.exe, e.g.
//
// sc.exe create storagenode-updater binpath= "C:\Users\MyUser\storagenode-updater.exe run ..."
//go:build windows
// +build windows
package main
import (
"os"
"time"
"go.uber.org/zap"
"golang.org/x/sync/errgroup"
"golang.org/x/sys/windows/svc"
"storj.io/private/process"
)
func isRunCmd() bool {
return len(os.Args) > 1 && os.Args[1] == "run"
}
func main() {
isService, err := svc.IsWindowsService()
if err != nil {
zap.L().Fatal("Failed to determine if session is interactive.", zap.Error(err))
}
if !isService || !isRunCmd() {
process.Exec(rootCmd)
return
}
err = svc.Run("storagenode-updater", &service{})
if err != nil {
zap.L().Fatal("Service failed.", zap.Error(err))
}
}
type service struct{}
func (m *service) 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}
var group errgroup.Group
group.Go(func() error {
process.Exec(rootCmd)
return nil
})
changes <- svc.Status{State: svc.Running, Accepts: cmdsAccepted}
for c := range r {
switch c.Cmd {
case svc.Interrogate:
zap.L().Info("Interrogate request received.")
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:
zap.L().Info("Stop/Shutdown request received.")
changes <- svc.Status{State: svc.StopPending}
// Cancel the command's root context to cleanup resources
_, cancel := process.Ctx(runCmd)
cancel()
_ = group.Wait() // process.Exec does not return an error
// After returning the Windows Service is stopped and the process terminates
return false, 0
default:
zap.L().Info("Unexpected control request.", zap.Uint32("Event Type", c.EventType))
}
}
return false, 0
}