Add sing-box API service

log/factory.go

@@ -22,6 +22,7 @@ type Factory interface {
 type ObservableFactory interface {
 	Factory
 	observable.Observable[Entry]
+	AttachPlatformWriter(writer PlatformWriter)
 }
 
 type Entry struct {

log/nop.go

@@ -80,6 +80,9 @@ func (f *nopFactory) FatalContext(ctx context.Context, args ...any) {
 func (f *nopFactory) PanicContext(ctx context.Context, args ...any) {
 }
 
+func (f *nopFactory) AttachPlatformWriter(writer PlatformWriter) {
+}
+
 func (f *nopFactory) Subscribe() (subscription observable.Subscription[Entry], done <-chan struct{}, err error) {
 	return nil, nil, os.ErrInvalid
 }

log/observable.go

@@ -14,7 +14,7 @@ import (
 	"github.com/sagernet/sing/service/filemanager"
 )
 
-var _ Factory = (*defaultFactory)(nil)
+var _ ObservableFactory = (*defaultFactory)(nil)
 
 type defaultFactory struct {
 	ctx               context.Context
@@ -23,7 +23,7 @@ type defaultFactory struct {
 	writer            io.Writer
 	file              *os.File
 	filePath          string
-	platformWriter    PlatformWriter
+	platformWriters   atomic.Pointer[[]PlatformWriter]
 	needObservable    bool
 	level             Level
 	subscriber        *observable.Subscriber[Entry]
@@ -58,11 +58,13 @@ func NewDefaultFactory(
 		},
 		writer:         writer,
 		filePath:       filePath,
-		platformWriter: platformWriter,
 		needObservable: needObservable,
 		level:          LevelTrace,
 		subscriber:     observable.NewSubscriber[Entry](128),
 	}
+	if platformWriter != nil {
+		factory.platformWriters.Store(&[]PlatformWriter{platformWriter})
+	}
 	/*if platformWriter != nil {
 		factory.platformFormatter.DisableColors = platformWriter.DisableColors()
 	}*/
@@ -104,6 +106,19 @@ func (f *defaultFactory) Close() error {
 	)
 }
 
+func (f *defaultFactory) AttachPlatformWriter(writer PlatformWriter) {
+	writers := append(f.loadPlatformWriters(), writer)
+	f.platformWriters.Store(&writers)
+}
+
+func (f *defaultFactory) loadPlatformWriters() []PlatformWriter {
+	writers := f.platformWriters.Load()
+	if writers == nil {
+		return nil
+	}
+	return *writers
+}
+
 func (f *defaultFactory) Level() Level {
 	return f.level
 }
@@ -151,8 +166,12 @@ func (f *defaultFactory) output(ctx context.Context, level Level, tag string, me
 			os.Exit(1)
 		}
 	}
-	if f.platformWriter != nil {
-		f.platformWriter.WriteMessage(level, f.platformFormatter.Format(ctx, level, tag, message, timestamp))
+	platformWriters := f.loadPlatformWriters()
+	if len(platformWriters) > 0 {
+		platformMessage := f.platformFormatter.Format(ctx, level, tag, message, timestamp)
+		for _, platformWriter := range platformWriters {
+			platformWriter.WriteMessage(level, platformMessage)
+		}
 	}
 }
 
@@ -165,7 +184,8 @@ type observableLogger struct {
 
 func (l *observableLogger) Log(ctx context.Context, level Level, args []any) {
 	level = OverrideLevelFromContext(level, ctx)
-	if level > l.level && l.platformWriter == nil && !l.needObservable {
+	platformWriters := l.loadPlatformWriters()
+	if level > l.level && len(platformWriters) == 0 && !l.needObservable {
 		return
 	}
 	nowTime := time.Now()