refactor: remove SPNGroup from 'control.instance' interface and update pause logic

service/control/module.go

@@ -31,7 +31,6 @@ type Control struct {
 type instance interface {
 	Config() *config.Config
 	InterceptionGroup() *mgr.GroupModule
-	SPNGroup() *mgr.ExtendedGroup
 	IsShuttingDown() bool
 }
 

service/control/pause.go

@@ -32,15 +32,18 @@ func (c *Control) pause(duration time.Duration, onlySPN bool) (retErr error) {
 		return errors.New("invalid pause duration")
 	}
 
+	spn_enabled := config.GetAsBool("spn/enable", false)
 	if onlySPN {
 		if c.pauseInfo.Interception {
 			return errors.New("cannot pause SPN separately when core is paused")
 		}
-		if !c.pauseInfo.SPN && !c.instance.SPNGroup().Ready() {
+		// If SPN is not running and not already paused, cannot pause it or change pause duration.
+		if !spn_enabled() && !c.pauseInfo.SPN {
 			return errors.New("cannot pause SPN when it is not running")
 		}
 	}
 
+	// Stop resume worker if running and start a new one later.
 	c.stopResumeWorker()
 	defer func() {
 		if retErr == nil {
@@ -49,18 +52,16 @@ func (c *Control) pause(duration time.Duration, onlySPN bool) (retErr error) {
 		}
 	}()
 
+	// Pause SPN if not already paused.
 	if !c.pauseInfo.SPN {
-		if c.instance.SPNGroup().Ready() {
-			enabled := config.GetAsBool("spn/enable", false)
-			if enabled() {
-				// TODO: the 'pause' state must not make permanent config changes.
-				// Consider possibility to not store permanent config changes.
-				// E.g. SPN enabled -> pause SPN -> restart PC/Portmaster -> SPN should be enabled again.
-				config.SetConfigOption("spn/enable", false)
-				c.mgr.Info("SPN paused")
-			}
-			c.pauseInfo.SPN = true
+		if spn_enabled() {
+			// TODO: the 'pause' state must not make permanent config changes.
+			// Consider possibility to not store permanent config changes.
+			// E.g. SPN enabled -> pause SPN -> restart PC/Portmaster -> SPN should be enabled again.
+			config.SetConfigOption("spn/enable", false)
+			c.mgr.Info("SPN paused")
 		}
+		c.pauseInfo.SPN = true
 	}
 
 	if onlySPN {

service/instance.go

@@ -317,7 +317,11 @@ func New(svcCfg *ServiceConfig) (*Instance, error) { //nolint:maintidx
 	// Grouped interception modules that can be paused/resumed together.
 	instance.serviceGroupInterception = mgr.NewGroupModule("Interception Group",
 		instance.interception,
-		instance.dnsmonitor,
+
+		// TODO: The dnsmonitor is currently not part of this group, as it has inconsistent issue when stopping.
+		// 		 Fix chars-issue of this module and re-add it here.
+		//instance.dnsmonitor,
+
 		instance.compat)
 
 	// Add all modules to instance group.
@@ -348,11 +352,12 @@ func New(svcCfg *ServiceConfig) (*Instance, error) { //nolint:maintidx
 		instance.filterLists,
 		instance.customlist,
 
-		// Grouped interception modules:
+		// Grouped pausable interception modules:
 		// 		instance.interception,
 		// 		instance.dnsmonitor,
 		// 		instance.compat
 		instance.serviceGroupInterception,
+		instance.dnsmonitor, // TODO: Remove when re-added to serviceGroupInterception group.
 
 		instance.status,
 		instance.broadcasts,