refactor: replace direct newService calls with ServiceCommand pattern

- Replace all direct newService() calls with ServiceCommand initialization
- Update command constructors to use ServiceCommand instead of ServiceManager
- Simplify LogCommand and UpgradeCommand structs by removing serviceManager field
- Remove unused global svcConfig variable from prog.go
- Improve consistency and centralize service creation logic

This change establishes a consistent pattern for service operations across
the codebase, making it easier to maintain and extend service-related
functionality.

cmd/cli/cli.go

@@ -241,7 +241,9 @@ func run(appCallback *AppCallback, stopCh chan struct{}) {
 		// We need to call s.Run() as soon as possible to response to the OS manager, so it
 		// can see ctrld is running and don't mark ctrld as failed service.
 		go func() {
-			s, err := newService(p, svcConfig)
+			svcCmd := NewServiceCommand()
+			svcConfig := svcCmd.createServiceConfig()
+			s, err := svcCmd.newService(p, svcConfig)
 			if err != nil {
 				p.Fatal().Err(err).Msg("failed create new service")
 			}
@@ -1636,7 +1638,8 @@ func exchangeContextWithTimeout(c *dns.Client, timeout time.Duration, msg *dns.M
 
 // curCdUID returns the current ControlD UID used by running ctrld process.
 func curCdUID() string {
-	if s, _ := newService(&prog{}, svcConfig); s != nil {
+	svcCmd := NewServiceCommand()
+	if s, _, _ := svcCmd.initializeServiceManager(); s != nil {
 		// Configure Windows service failure actions
 		if err := ConfigureWindowsServiceFailureActions(ctrldServiceName); err != nil {
 			mainLog.Load().Debug().Err(err).Msgf("failed to configure Windows service %s failure actions", ctrldServiceName)
@@ -1770,7 +1773,8 @@ func doValidateCdRemoteConfig(cdUID string, fatal bool) error {
 
 // uninstallInvalidCdUID performs self-uninstallation because the ControlD device does not exist.
 func uninstallInvalidCdUID(p *prog, logger *ctrld.Logger, doStop bool) bool {
-	s, err := newService(p, svcConfig)
+	svcCmd := NewServiceCommand()
+	s, _, err := svcCmd.initializeServiceManager()
 	if err != nil {
 		logger.Warn().Err(err).Msg("failed to create new service")
 		return false

cmd/cli/commands_clients.go

@@ -38,12 +38,13 @@ func NewClientsCommand() (*ClientsCommand, error) {
 // ListClients lists all connected clients
 func (cc *ClientsCommand) ListClients(cmd *cobra.Command, args []string) error {
 	// Check service status first
-	sm, err := NewServiceManager()
+	sc := NewServiceCommand()
+	s, _, err := sc.initializeServiceManager()
 	if err != nil {
 		return err
 	}
 
-	status, err := sm.Status()
+	status, err := s.Status()
 	if errors.Is(err, service.ErrNotInstalled) {
 		mainLog.Load().Warn().Msg("service not installed")
 		return nil

cmd/cli/commands_log.go

@@ -14,17 +14,11 @@ import (
 
 // LogCommand handles log-related operations
 type LogCommand struct {
-	serviceManager *ServiceManager
-	controlClient  *controlClient
+	controlClient *controlClient
 }
 
 // NewLogCommand creates a new log command handler
 func NewLogCommand() (*LogCommand, error) {
-	sm, err := NewServiceManager()
-	if err != nil {
-		return nil, err
-	}
-
 	dir, err := socketDir()
 	if err != nil {
 		return nil, fmt.Errorf("failed to find ctrld home dir: %w", err)
@@ -32,8 +26,7 @@ func NewLogCommand() (*LogCommand, error) {
 
 	cc := newControlClient(filepath.Join(dir, ctrldControlUnixSock))
 	return &LogCommand{
-		serviceManager: sm,
-		controlClient:  cc,
+		controlClient: cc,
 	}, nil
 }
 
@@ -45,7 +38,13 @@ func (lc *LogCommand) warnRuntimeLoggingNotEnabled() {
 
 // SendLogs sends runtime debug logs to ControlD
 func (lc *LogCommand) SendLogs(cmd *cobra.Command, args []string) error {
-	status, err := lc.serviceManager.Status()
+	sc := NewServiceCommand()
+	s, _, err := sc.initializeServiceManager()
+	if err != nil {
+		return err
+	}
+
+	status, err := s.Status()
 	if errors.Is(err, service.ErrNotInstalled) {
 		mainLog.Load().Warn().Msg("service not installed")
 		return nil
@@ -85,7 +84,13 @@ func (lc *LogCommand) SendLogs(cmd *cobra.Command, args []string) error {
 
 // ViewLogs views current runtime debug logs
 func (lc *LogCommand) ViewLogs(cmd *cobra.Command, args []string) error {
-	status, err := lc.serviceManager.Status()
+	sc := NewServiceCommand()
+	s, _, err := sc.initializeServiceManager()
+	if err != nil {
+		return err
+	}
+
+	status, err := s.Status()
 	if errors.Is(err, service.ErrNotInstalled) {
 		mainLog.Load().Warn().Msg("service not installed")
 		return nil

cmd/cli/commands_service.go

@@ -35,7 +35,7 @@ func (sc *ServiceCommand) initializeServiceManager() (service.Service, *prog, er
 func (sc *ServiceCommand) initializeServiceManagerWithServiceConfig(svcConfig *service.Config) (service.Service, *prog, error) {
 	p := &prog{}
 
-	s, err := newService(p, svcConfig)
+	s, err := sc.newService(p, svcConfig)
 	if err != nil {
 		return nil, nil, fmt.Errorf("failed to create service: %w", err)
 	}
@@ -44,6 +44,15 @@ func (sc *ServiceCommand) initializeServiceManagerWithServiceConfig(svcConfig *s
 	return s, p, nil
 }
 
+// newService creates a new service instance using the provided program and configuration.
+func (sc *ServiceCommand) newService(p *prog, svcConfig *service.Config) (service.Service, error) {
+	s, err := newService(p, svcConfig)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create service: %w", err)
+	}
+	return s, nil
+}
+
 // NewServiceCommand creates a new service command handler
 func NewServiceCommand() *ServiceCommand {
 	return &ServiceCommand{}

cmd/cli/commands_upgrade.go

@@ -22,19 +22,11 @@ const (
 
 // UpgradeCommand handles upgrade-related operations
 type UpgradeCommand struct {
-	serviceManager *ServiceManager
 }
 
 // NewUpgradeCommand creates a new upgrade command handler
 func NewUpgradeCommand() (*UpgradeCommand, error) {
-	sm, err := NewServiceManager()
-	if err != nil {
-		return nil, err
-	}
-
-	return &UpgradeCommand{
-		serviceManager: sm,
-	}, nil
+	return &UpgradeCommand{}, nil
 }
 
 // Upgrade performs the upgrade operation
@@ -53,19 +45,10 @@ func (uc *UpgradeCommand) Upgrade(cmd *cobra.Command, args []string) error {
 		mainLog.Load().Fatal().Err(err).Msg("failed to get current ctrld binary path")
 	}
 
-	// Create service config with executable path
-	sc := &service.Config{
-		Name:        ctrldServiceName,
-		DisplayName: "Control-D Helper Service",
-		Description: "A highly configurable, multi-protocol DNS forwarding proxy",
-		Option:      service.KeyValue{},
-		Executable:  bin,
-	}
-
 	readConfig(false)
 	v.Unmarshal(&cfg)
-	p := &prog{}
-	s, err := newService(p, sc)
+	svcCmd := NewServiceCommand()
+	s, p, err := svcCmd.initializeServiceManager()
 	if err != nil {
 		mainLog.Load().Error().Msg(err.Error())
 		return nil

cmd/cli/prog.go

@@ -79,13 +79,6 @@ var logf = func(format string, args ...any) {
 //lint:ignore U1000 use in newLoopbackOSConfigurator
 var noopLogf = func(format string, args ...any) {}
 
-var svcConfig = &service.Config{
-	Name:        ctrldServiceName,
-	DisplayName: "Control-D Helper Service",
-	Description: "A highly configurable, multi-protocol DNS forwarding proxy",
-	Option:      service.KeyValue{},
-}
-
 var useSystemdResolved = false
 
 type prog struct {