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main.go
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main.go
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package main
import (
"fmt"
"log"
"os"
"path/filepath"
"time"
"golang.org/x/sys/windows/svc"
"golang.org/x/sys/windows/svc/mgr"
)
// usage prints a usage message and exits.
func usage(name string) {
fmt.Printf("Usage:\n")
fmt.Printf(" %s -i install service\n", name)
fmt.Printf(" %s -r remove service\n", name)
fmt.Printf(" %s -u update service\n", name)
os.Exit(1)
}
func main() {
executable, err := os.Executable()
if err != nil {
log.Fatalf("error getting executable: %v", err)
}
dir := filepath.Dir(executable)
name, args := os.Args[0], os.Args[1:]
if len(args) != 1 {
usage(name)
}
switch args[0] {
case "-i":
install(dir)
case "-r":
remove()
case "-u":
update(dir)
default:
usage(name)
}
}
// install creates a service to run service.exe, then starts the service.
func install(dir string) {
m, err := mgr.Connect()
if err != nil {
log.Fatalf("error connecting to service control manager: %v", err)
}
servicePath := filepath.Join(dir, "service.exe")
config := mgr.Config{
DisplayName: "Sample Windows service written in Go",
StartType: mgr.StartAutomatic,
}
s, err := m.CreateService("sample-service", servicePath, config)
if err != nil {
log.Fatalf("error creating service: %v", err)
}
defer s.Close()
err = s.Start()
if err != nil {
log.Fatalf("error starting service: %v", err)
}
}
// remove deletes and stops the service.
func remove() {
m, err := mgr.Connect()
if err != nil {
log.Fatalf("error connecting to service control manager: %v", err)
}
s, err := m.OpenService("sample-service")
if err != nil {
log.Fatalf("error opening service: %v", err)
}
defer s.Close()
err = s.Delete()
if err != nil {
log.Fatalf("error marking service for deletion: %v", err)
}
_, err = s.Control(svc.Stop)
if err != nil {
log.Fatalf("error requesting service to stop: %v", err)
}
}
// update updates the service to version 2.
func update(dir string) {
log.Printf("updating service to version 2...")
m, err := mgr.Connect()
if err != nil {
log.Fatalf("error connecting to service control manager: %v", err)
}
service, err := m.OpenService("sample-service")
if err != nil {
log.Fatalf("error accessing service: %v", err)
}
config, err := service.Config()
if err != nil {
log.Fatalf("error getting service config: %v", err)
}
config.BinaryPathName = filepath.Join(dir, "service-2.exe")
err = service.UpdateConfig(config)
if err != nil {
log.Fatalf("error updating config: %v", err)
}
log.Print("requesting service to stop")
status, err := service.Control(svc.Stop)
if err != nil {
log.Fatalf("error requesting service to stop: %v", err)
}
log.Printf("sent stop; service state is %v", status.State)
for i := 0; i <= 12; i++ {
log.Printf("querying service status (attempt %d)", i)
status, err = service.Query()
if err != nil {
log.Fatalf("error querying service: %v", err)
}
log.Printf("service state: %v", status.State)
if status.State == svc.Stopped {
log.Println("service state is 'stopped'")
break
}
time.Sleep(10 * time.Second)
}
log.Println("starting service")
err = service.Start()
if err != nil {
log.Fatalf("error starting service: %v", err)
}
log.Print("service updated to version 2")
}