| 1 | | | import 'dart:async'; |
| 2 | | | import 'dart:js_interop'; |
| 3 | | | |
| 4 | | | import 'package:logger/web.dart'; |
| 5 | | | import 'package:meta/meta.dart'; |
| 6 | | | import 'package:web/web.dart' as web; |
| 7 | | | |
| 8 | | | import '../../exceptions/squadron_error.dart'; |
| 9 | | | import '../../exceptions/squadron_exception.dart'; |
| 10 | | | import '../../typedefs.dart'; |
| 11 | | | import '../../worker/worker_channel.dart'; |
| 12 | | | import '../../worker/worker_response.dart'; |
| 13 | | | import '../xplat/_transferables.dart'; |
| 14 | | | |
| 15 | | | /// [WorkerChannel] implementation for the JavaScript world. |
| 16 | | | final class _WebWorkerChannel implements WorkerChannel { |
| 17 | | | _WebWorkerChannel._(this._sendPort, this._logger); |
| 18 | | | |
| 19 | | | /// [web.MessagePort] to communicate with the [web.Worker] if the channel is |
| 20 | | | /// owned by the worker owner. Otherwise, [web.MessagePort] to return values |
| 21 | | | /// to the client. |
| 22 | | | final web.MessagePort _sendPort; |
| 23 | | | |
| 24 | | | final Logger? _logger; |
| 25 | | | |
| 26 | | 1 | void _postResponse(WorkerResponse res) { |
| 27 | | 1 | try { |
| 28 | | 1 | _sendPort.postMessage(res.wrapInPlace().jsify()); |
| 29 | | 0 | } catch (ex, st) { |
| 30 | | 1 | _logger?.e(() => 'Failed to post response $res: $ex'); |
| 31 | | 0 | throw SquadronErrorExt.create('Failed to post response: $ex', st); |
| 32 | | | } |
| 33 | | 1 | } |
| 34 | | | |
| 35 | | 0 | void _inspectAndPostResponse(WorkerResponse res) { |
| 36 | | 0 | try { |
| 37 | | 0 | final data = res.wrapInPlace(); |
| 38 | | 0 | final transfer = Transferables.get(data); |
| 39 | | 0 | if (transfer == null || transfer.isEmpty) { |
| 40 | | 0 | _sendPort.postMessage(data.jsify()); |
| 41 | | | } else { |
| 42 | | 0 | _sendPort.postMessage(data.jsify(), transfer.jsify() as JSArray); |
| 43 | | | } |
| 44 | | 0 | } catch (ex, st) { |
| 45 | | 1 | _logger?.e(() => 'Failed to post response $res: $ex'); |
| 46 | | 0 | throw SquadronErrorExt.create('Failed to post response: $ex', st); |
| 47 | | | } |
| 48 | | 0 | } |
| 49 | | | |
| 50 | | | /// Sends the [web.MessagePort] to communicate with the [web.Worker]. This |
| 51 | | | /// method must be called by the [web.Worker] upon startup. |
| 52 | | | @override |
| 53 | | | void connect(PlatformChannel channelInfo) => inspectAndReply(channelInfo); |
| 54 | | | |
| 55 | | | /// Sends a [WorkerResponse] with the specified data to the worker client. |
| 56 | | | /// This method must be called from the [web.Worker] only. On Web patforms, |
| 57 | | | /// this version does not check arguments for transferable objects. |
| 58 | | | @override |
| 59 | | 1 | void reply(dynamic data) => _postResponse(WorkerResponse.withResult(data)); |
| 60 | | | |
| 61 | | | /// Sends a [WorkerResponse] with the specified data to the worker client. |
| 62 | | | /// This method must be called from the [web.Worker] only. On Web patforms, |
| 63 | | | /// this version (tentatively) checks arguments for transferable objects. |
| 64 | | | @override |
| 65 | | 0 | void inspectAndReply(dynamic data) => |
| 66 | | 0 | _inspectAndPostResponse(WorkerResponse.withResult(data)); |
| 67 | | | |
| 68 | | | @override |
| 69 | | | void log(LogEvent message) => _postResponse(WorkerResponse.log(message)); |
| 70 | | | |
| 71 | | | /// Checks if [stream] can be streamed back to the worker client. Returns |
| 72 | | | /// `true` for browser platforms. |
| 73 | | | @override |
| 74 | | | bool canStream(Stream<dynamic> stream) => true; |
| 75 | | | |
| 76 | | | /// Sends a [WorkerResponse.closeStream] to the worker client. This method |
| 77 | | | /// must be called from the [web.Worker] only. |
| 78 | | | @override |
| 79 | | 1 | void closeStream() => _postResponse(WorkerResponse.closeStream()); |
| 80 | | | |
| 81 | | | /// Sends the [WorkerResponse] to the worker client. This method must be |
| 82 | | | /// called from the [web.Worker] only. |
| 83 | | | @override |
| 84 | | 0 | void error(Object err, [StackTrace? stackTrace, int? command]) { |
| 85 | | 1 | final ex = SquadronException.from(err, stackTrace, command); |
| 86 | | 1 | _postResponse(WorkerResponse.withError(ex)); |
| 87 | | 0 | } |
| 88 | | | } |
| 89 | | | |
| 90 | | | /// Creates a [WorkerChannel] from a [web.MessagePort]. |
| 91 | | | @internal |
| 92 | | | WorkerChannel? deserialize(PlatformChannel? channelInfo, [Logger? logger]) => |
| 93 | | | (channelInfo == null) ? null : _WebWorkerChannel._(channelInfo, logger); |