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winservice.go
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winservice.go
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package winservice
import (
"fmt"
"time"
"golang.org/x/sys/windows/svc"
"golang.org/x/sys/windows/svc/eventlog"
"golang.org/x/sys/windows/svc/mgr"
)
// Install a new service
func Install(name, desc, exepath string) error {
m, err := mgr.Connect()
if err != nil {
return err
}
defer m.Disconnect()
s, err := m.OpenService(name)
if err == nil {
s.Close()
return fmt.Errorf("service %s already exists", name)
}
s, err = m.CreateService(name, exepath, mgr.Config{DisplayName: name,
StartType: mgr.StartAutomatic,
Description: desc})
if err != nil {
return err
}
defer s.Close()
err = eventlog.InstallAsEventCreate(name, eventlog.Error|eventlog.Warning|eventlog.Info)
if err != nil {
s.Delete()
return fmt.Errorf("Install() failed: %s", err)
}
return nil
}
// Remove a service by name
func Remove(name string) error {
m, err := mgr.Connect()
if err != nil {
return err
}
defer m.Disconnect()
s, err := m.OpenService(name)
if err != nil {
return fmt.Errorf("service %s is not installed", name)
}
defer s.Close()
err = s.Delete()
if err != nil {
return err
}
err = eventlog.Remove(name)
if err != nil {
return fmt.Errorf("Remove() failed: %s", err)
}
return nil
}
// Start a service by name
func Start(name string) error {
m, err := mgr.Connect()
if err != nil {
return err
}
defer m.Disconnect()
s, err := m.OpenService(name)
if err != nil {
return fmt.Errorf("could not access service: %v", err)
}
defer s.Close()
err = s.Start()
if err != nil {
return fmt.Errorf("could not start service: %v", err)
}
return nil
}
// Control a service by name
func Control(name string, c svc.Cmd, to svc.State) error {
m, err := mgr.Connect()
if err != nil {
return err
}
defer m.Disconnect()
s, err := m.OpenService(name)
if err != nil {
return fmt.Errorf("could not access service: %v", err)
}
defer s.Close()
status, err := s.Control(c)
if err != nil {
return fmt.Errorf("could not send control=%d: %v", c, err)
}
timeout := time.Now().Add(10 * time.Second)
for status.State != to {
if timeout.Before(time.Now()) {
return fmt.Errorf("timeout waiting for service to go to state=%d", to)
}
time.Sleep(300 * time.Millisecond)
status, err = s.Query()
if err != nil {
return fmt.Errorf("could not retrieve service status: %v", err)
}
}
return nil
}
// Stop a service by name
func Stop(name string) error {
return Control(name, svc.Stop, svc.Stopped)
}