Add status command receiver

lib/services/singbox/ffi_singbox_service.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:ffi';
 import 'dart:io';
+import 'dart:isolate';
 
 import 'package:combine/combine.dart';
 import 'package:ffi/ffi.dart';
@@ -16,6 +17,8 @@ final _logger = Loggy('FFISingboxService');
 class FFISingboxService with InfraLogger implements SingboxService {
   static final SingboxNativeLibrary _box = _gen();
 
+  Stream<String>? _statusStream;
+
   static SingboxNativeLibrary _gen() {
     String fullPath = "";
     if (Platform.environment.containsKey('FLUTTER_TEST')) {
@@ -47,6 +50,7 @@ class FFISingboxService with InfraLogger implements SingboxService {
             workingDir.toNativeUtf8().cast(),
             tempDir.toNativeUtf8().cast(),
           );
+          _box.setupOnce(NativeApi.initializeApiDLData);
           return right(unit);
         },
       ),
@@ -119,6 +123,46 @@ class FFISingboxService with InfraLogger implements SingboxService {
     );
   }
 
+  @override
+  Stream<String> watchStatus() {
+    if (_statusStream != null) return _statusStream!;
+    final receiver = ReceivePort('status receiver');
+    final statusStream = receiver.asBroadcastStream(
+      onCancel: (_) {
+        _logger.debug("stopping status command client");
+        final err = _box.stopCommandClient(1).cast<Utf8>().toDartString();
+        if (err.isNotEmpty) {
+          _logger.warning("error stopping status client");
+        }
+        receiver.close();
+        _statusStream = null;
+      },
+    ).map(
+      (event) {
+        if (event case String _) {
+          if (event.startsWith('error:')) {
+            loggy.warning("[status client] error received: $event");
+            throw event.replaceFirst('error:', "");
+          }
+          return event;
+        }
+        loggy.warning("[status client] unexpected type, msg: $event");
+        throw "invalid type";
+      },
+    );
+
+    final err = _box
+        .startCommandClient(1, receiver.sendPort.nativePort)
+        .cast<Utf8>()
+        .toDartString();
+    if (err.isNotEmpty) {
+      loggy.warning("error starting status command: $err");
+      throw err;
+    }
+
+    return _statusStream = statusStream;
+  }
+
   @override
   Stream<String> watchLogs(String path) {
     var linesRead = 0;

lib/services/singbox/mobile_singbox_service.dart

@@ -67,6 +67,12 @@ class MobileSingboxService with InfraLogger implements SingboxService {
     );
   }
 
+  @override
+  Stream<String> watchStatus() {
+    // TODO: implement watchStatus
+    return const Stream.empty();
+  }
+
   @override
   Stream<String> watchLogs(String path) {
     return _logsChannel.receiveBroadcastStream().map(

lib/services/singbox/singbox_service.dart

@@ -26,5 +26,7 @@ abstract interface class SingboxService {
 
   TaskEither<String, Unit> stop();
 
+  Stream<String> watchStatus();
+
   Stream<String> watchLogs(String path);
 }