| 1 | | | import 'dart:async'; |
| 2 | | | import 'dart:js_interop'; |
| 3 | | | |
| 4 | | | import 'package:logger/web.dart'; |
| 5 | | | import 'package:web/web.dart' as web; |
| 6 | | | |
| 7 | | | import '../../channel.dart'; |
| 8 | | | import '../../exceptions/exception_manager.dart'; |
| 9 | | | import '../../exceptions/squadron_error.dart'; |
| 10 | | | import '../../exceptions/squadron_exception.dart'; |
| 11 | | | import '../../exceptions/worker_exception.dart'; |
| 12 | | | import '../../tokens/_squadron_cancelation_token.dart'; |
| 13 | | | import '../../typedefs.dart'; |
| 14 | | | import '../../worker/worker_channel.dart'; |
| 15 | | | import '../../worker/worker_request.dart'; |
| 16 | | | import '../../worker/worker_response.dart'; |
| 17 | | | import '../xplat/_disconnected_channel.dart'; |
| 18 | | | import '../xplat/_result_stream.dart'; |
| 19 | | | import '../xplat/_transferables.dart'; |
| 20 | | | import '_entry_point_uri.dart'; |
| 21 | | | import '_event_buffer.dart'; |
| 22 | | | import '_patch.dart'; |
| 23 | | | import '_uri_checker.dart'; |
| 24 | | | |
| 25 | | | part '_channel_impl.dart'; |
| 26 | | | |
| 27 | | | /// Stub implementations |
| 28 | | | |
| 29 | | | /// Starts a [web.Worker] using the [entryPoint] and sends a start |
| 30 | | | /// [WorkerRequest] with [startArguments]. The future completes after the |
| 31 | | | /// [web.Worker]'s main program has provided the [web.MessagePort] via |
| 32 | | | /// [WorkerChannel.connect]. |
| 33 | | 10 | Future<Channel> openChannel( |
| 34 | | | EntryPoint entryPoint, |
| 35 | | | ExceptionManager exceptionManager, |
| 36 | | | Logger? logger, |
| 37 | | | List startArguments, [ |
| 38 | | | PlatformThreadHook? hook, |
| 39 | | | ]) async { |
| 40 | | 10 | final completer = Completer<Channel>(); |
| 41 | | | final ready = Completer<bool>(); |
| 42 | | | Channel? channel; |
| 43 | | | |
| 44 | | | final com = web.MessageChannel(); |
| 45 | | 10 | final webEntryPoint = EntryPointUri.from(entryPoint); |
| 46 | | 10 | late web.Worker worker; |
| 47 | | | |
| 48 | | 3 | void fail(SquadronException ex) { |
| 49 | | 3 | if (!ready.isCompleted) ready.completeError(ex); |
| 50 | | 3 | if (!completer.isCompleted) completer.completeError(ex); |
| 51 | | 3 | } |
| 52 | | | |
| 53 | | 9 | void success(Channel channel) { |
| 54 | | 9 | if (!ready.isCompleted) { |
| 55 | | 0 | throw SquadronErrorExt.create('Invalid state: worker is not ready'); |
| 56 | | | } |
| 57 | | 9 | if (!completer.isCompleted) completer.complete(channel); |
| 58 | | 9 | } |
| 59 | | | |
| 60 | | 3 | try { |
| 61 | | 10 | worker = web.Worker(webEntryPoint.uri.toJS); |
| 62 | | | |
| 63 | | 2 | void $errorHandler(web.ErrorEvent? e) { |
| 64 | | 2 | final err = getError(e), error = SquadronErrorExt.create(err.toString()); |
| 65 | | 2 | logger?.e(() => 'Connection to Web Worker failed: $error'); |
| 66 | | 2 | fail(error); |
| 67 | | | |
| 68 | | 2 | UriChecker.exists(entryPoint).then((found) { |
| 69 | | 2 | try { |
| 70 | | 2 | final msg = (e != null) |
| 71 | | 2 | ? '$entryPoint => ${err.runtimeType} $err [${e.filename}(${e.lineno})]' |
| 72 | | 0 | : '$entryPoint => ${err.runtimeType} $err'; |
| 73 | | 1 | logger?.e(() => 'Unhandled error from Web Worker: $msg.'); |
| 74 | | 0 | if (!found) { |
| 75 | | 2 | logger?.e(() => 'It seems no Web Worker lives at $entryPoint.'); |
| 76 | | | } |
| 77 | | | } catch (_) { |
| 78 | | | // ignore |
| 79 | | | } |
| 80 | | 2 | }); |
| 81 | | 2 | } |
| 82 | | | |
| 83 | | 10 | worker.onerror = $errorHandler.toJS; |
| 84 | | 10 | worker.onmessageerror = $errorHandler.toJS; |
| 85 | | | |
| 86 | | | final disconnected = DisconnectedChannel(exceptionManager, logger); |
| 87 | | | |
| 88 | | 10 | worker.onmessage = (web.MessageEvent? e) { |
| 89 | | 10 | try { |
| 90 | | 10 | final response = WorkerResponseExt.from(getMessageEventData(e) as List); |
| 91 | | 10 | if (!response.unwrapInPlace(disconnected)) { |
| 92 | | 0 | return; |
| 93 | | | } |
| 94 | | | |
| 95 | | | final error = response.error; |
| 96 | | 10 | if (error != null) { |
| 97 | | 2 | logger?.e(() => 'Connection to Web Worker failed: $error'); |
| 98 | | 2 | fail(error); |
| 99 | | 9 | } else if (!ready.isCompleted) { |
| 100 | | 2 | logger?.t('Web Worker is ready'); |
| 101 | | 9 | ready.complete(response.result); |
| 102 | | | } |
| 103 | | 0 | } catch (ex, st) { |
| 104 | | 0 | return fail(SquadronException.from(ex, st)); |
| 105 | | | } |
| 106 | | 10 | }.toJS; |
| 107 | | | |
| 108 | | 10 | final res = await ready.future; |
| 109 | | | if (!res) { |
| 110 | | 0 | throw SquadronErrorExt.create('Web Worker is not ready'); |
| 111 | | | } |
| 112 | | | |
| 113 | | | final startRequest = WorkerRequest.start(com.port2, startArguments); |
| 114 | | | |
| 115 | | 9 | com.port1.onmessage = (web.MessageEvent e) { |
| 116 | | 9 | final response = WorkerResponseExt.from(getMessageEventData(e) as List); |
| 117 | | 9 | if (!response.unwrapInPlace(disconnected)) { |
| 118 | | 9 | return; |
| 119 | | | } |
| 120 | | | |
| 121 | | | final error = response.error; |
| 122 | | 9 | if (error != null) { |
| 123 | | 2 | logger?.e(() => 'Connection to Web Worker failed: $error'); |
| 124 | | 2 | fail(error); |
| 125 | | | } else if (response.endOfStream) { |
| 126 | | 1 | logger?.w('Disconnecting from Isolate'); |
| 127 | | 1 | channel?.close(); |
| 128 | | 9 | } else if (!completer.isCompleted) { |
| 129 | | 2 | logger?.t('Connected to Web Worker'); |
| 130 | | 9 | channel = _WebChannel._(response.result, logger, exceptionManager); |
| 131 | | 9 | success(channel!); |
| 132 | | | } else { |
| 133 | | 2 | logger?.d(() => 'Unexpected response: $response'); |
| 134 | | | } |
| 135 | | 9 | }.toJS; |
| 136 | | | |
| 137 | | 0 | try { |
| 138 | | 9 | final data = startRequest.wrapInPlace(); |
| 139 | | | final msg = data.jsify(); |
| 140 | | 9 | final transfer = Transferables.get(data); |
| 141 | | | if (transfer == null || transfer.isEmpty) { |
| 142 | | | worker.postMessage(msg); |
| 143 | | | } else { |
| 144 | | 9 | final jsTransfer = transfer.jsify() as JSArray; |
| 145 | | | worker.postMessage(msg, jsTransfer); |
| 146 | | | } |
| 147 | | 0 | } catch (ex, st) { |
| 148 | | 2 | logger?.e(() => 'Failed to post connection request $startRequest: $ex'); |
| 149 | | 0 | throw SquadronErrorExt.create( |
| 150 | | 0 | 'Failed to post connection request: $ex', st); |
| 151 | | | } |
| 152 | | | |
| 153 | | 2 | try { |
| 154 | | 9 | final channel = await completer.future; |
| 155 | | 9 | await hook?.call(worker); |
| 156 | | 2 | logger?.t('Created Web Worker for $entryPoint'); |
| 157 | | 9 | return channel; |
| 158 | | | } catch (ex) { |
| 159 | | 2 | logger?.e(() => 'Connection to Isolate failed: $ex'); |
| 160 | | 2 | rethrow; |
| 161 | | | } |
| 162 | | 3 | } catch (ex, st) { |
| 163 | | 3 | ready.future.ignore(); |
| 164 | | 3 | completer.future.ignore(); |
| 165 | | 1 | logger?.t('Failed to create Web Worker for $entryPoint'); |
| 166 | | | com.port1.close(); |
| 167 | | | com.port2.close(); |
| 168 | | | worker.terminate(); |
| 169 | | 3 | throw SquadronException.from(ex, st); |
| 170 | | | } finally { |
| 171 | | | webEntryPoint.release(); |
| 172 | | | } |
| 173 | | 10 | } |
| 174 | | | |
| 175 | | | /// Creates a [_WebChannel] from a [web.MessagePort]. |
| 176 | | | Channel? deserialize(PlatformChannel? channelInfo, |
| 177 | | | [Logger? logger, ExceptionManager? exceptionManager]) => |
| 178 | | | (channelInfo == null) |
| 179 | | | ? null |
| 180 | | | : _WebChannel._( |
| 181 | | | channelInfo, |
| 182 | | | logger, |
| 183 | | | exceptionManager ?? ExceptionManager(), |
| 184 | | | ); |