macOS Example : `Bad State: Messenger is not attached to an worker` error

[sbesnard]

Hi,

I ran into this problem on may Mac M1 running vanilla example and trying to play a sample wav.

flutter: [coast_audio/AudioResource] Disposed `AudioDeviceContext` (id: 805301168)
2024-06-06 14:09:08.846 example[88820:29401807] WARNING: Secure coding is automatically enabled for restorable state! However, not on all supported macOS versions of this application. Opt-in to secure coding explicitly by implementing NSApplicationDelegate.applicationSupportsSecureRestorableState:.
[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Bad state: Messenger is not attached to an worker
#0      AudioIsolateHostMessenger.request (package:coast_audio/src/isolate/audio_isolate_messenger.dart:27:7)
#1      AudioIsolate.request (package:coast_audio/src/isolate/audio_isolate.dart:106:23)
#2      PlayerIsolate.getPosition (package:example/isolates/player_isolate.dart:133:21)
#3      _PlayerTileState.build.<anonymous closure> (package:example/components/player_tile.dart:160:50)
#4      _PlayerTimerBuilderState._init.<anonymous closure> (package:example/components/player_tile.dart:267:43)
#5      _Timer._runTimers (dart:isolate-patch/timer_impl.dart:398:19)
#6      _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:429:5)
#7      _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)

Any idea ?

Thanks in advance

[SKKbySSK]

Hi @sbesnard I'm aware that the secure coding is not the actual problem.

Instead, this line indicates the exception is coming from AudioIsolate.

[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: Bad state: Messenger is not attached to an worker.
#0      AudioIsolateHostMessenger.request (package:coast_audio/src/isolate/audio_isolate_messenger.dart:27:7)
#1      AudioIsolate.request (package:coast_audio/src/isolate/audio_isolate.dart:106:23)
#2      PlayerIsolate.getPosition (package:example/isolates/player_isolate.dart:133:21)
#3      _PlayerTileState.build.<anonymous closure> (package:example/components/player_tile.dart:160:50)
#4      _PlayerTimerBuilderState._init.<anonymous closure> (package:example/components/player_tile.dart:267:43)
#5      _Timer._runTimers (dart:isolate-patch/timer_impl.dart:398:19)
#6      _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:429:5)
#7      _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:12)

Can you attach the wav file when this problem occurs?

[sbesnard]

@SKKbySSK You're right, I changed the subject of this issue. Sorry !

I just launched VSCode in the example folder of the repo. The issue happens when I stop the recording. I can trace the pb to this line in player_tile.dart:

 onTick: (isolate) {
    return isolate.getPosition();
    },

Which in turn calls ultimately audio_isolate_messenger.dart:

Future<TResponse?> request<TRequest, TResponse>(TRequest payload) async {
    final sendPort = _sendPort;
    if (sendPort == null) {
      throw StateError('Messenger is not attached to an worker');
    }

    final request = AudioIsolateHostRequest(payload);
    final responseFuture = message.firstWhere((r) => r is AudioIsolateWorkerResponse && r.requestId == request.id);
    sendPort.send(request);

    final AudioIsolateWorkerResponse response;
    try {
      response = await responseFuture as AudioIsolateWorkerResponse;
    } on StateError {
      return null;
    }

    switch (response) {
      case AudioIsolateWorkerSuccessResponse():
        if (response.payload is TResponse) {
          return response.payload as TResponse;
        } else {
          throw StateError('Unexpected response type: ${response.payload.runtimeType}');
        }
      case AudioIsolateWorkerFailedResponse():
        return Future.error(response.exception, response.stackTrace);
    }
  }

Thanks! I am working on another piece of code that may not have this issue.I'll keep you posted.

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