Switch config change notifier to event hooking

config/main.go

@@ -10,7 +10,12 @@ import (
 	"github.com/safing/portmaster/core/structure"
 )
 
+const (
+	configChangeEvent = "config change"
+)
+
 var (
+	module   *modules.Module
 	dataRoot *utils.DirStructure
 )
 
@@ -22,7 +27,8 @@ func SetDataRoot(root *utils.DirStructure) {
 }
 
 func init() {
-	modules.Register("config", prep, start, nil, "base", "database")
+	module = modules.Register("config", prep, start, nil, "base", "database")
+	module.RegisterEvent(configChangeEvent)
 }
 
 func prep() error {

config/set.go

@@ -17,9 +17,6 @@ var (
 
 	validityFlag     = abool.NewBool(true)
 	validityFlagLock sync.RWMutex
-
-	changedSignal     = make(chan struct{})
-	changedSignalLock sync.Mutex
 )
 
 func getValidityFlag() *abool.AtomicBool {
@@ -28,13 +25,6 @@ func getValidityFlag() *abool.AtomicBool {
 	return validityFlag
 }
 
-// Changed signals if any config option was changed.
-func Changed() <-chan struct{} {
-	changedSignalLock.Lock()
-	defer changedSignalLock.Unlock()
-	return changedSignal
-}
-
 func signalChanges() {
 	// refetch and save release level and expertise level
 	updateReleaseLevel()
@@ -46,11 +36,7 @@ func signalChanges() {
 	validityFlag = abool.NewBool(true)
 	validityFlagLock.Unlock()
 
-	// trigger change signal: signal listeners that a config option was changed.
-	changedSignalLock.Lock()
-	close(changedSignal)
-	changedSignal = make(chan struct{})
-	changedSignalLock.Unlock()
+	module.TriggerEvent(configChangeEvent, nil)
 }
 
 // setConfig sets the (prioritized) user defined config.