| // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| // The following code is copied from sdk/lib/io/websocket_impl.dart. The |
| // "dart:io" implementation isn't used directly to support non-"dart:io" |
| // applications. |
| // |
| // Because it's copied directly, only modifications necessary to support the |
| // desired public API and to remove "dart:io" dependencies have been made. |
| // |
| // This is up-to-date as of sdk revision |
| // 365f7b5a8b6ef900a5ee23913b7203569b81b175. |
| |
| // ignore_for_file: unused_field, constant_identifier_names |
| |
| import 'dart:async'; |
| import 'dart:convert'; |
| import 'dart:math'; |
| import 'dart:typed_data'; |
| |
| import '../exception.dart'; |
| import 'io_sink.dart'; |
| import 'web_socket.dart'; |
| |
| const String webSocketGUID = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'; |
| |
| final _random = Random(); |
| |
| // Matches _WebSocketOpcode. |
| class _WebSocketMessageType { |
| static const int NONE = 0; |
| static const int TEXT = 1; |
| static const int BINARY = 2; |
| } |
| |
| class _WebSocketOpcode { |
| static const int CONTINUATION = 0; |
| static const int TEXT = 1; |
| static const int BINARY = 2; |
| static const int RESERVED_3 = 3; |
| static const int RESERVED_4 = 4; |
| static const int RESERVED_5 = 5; |
| static const int RESERVED_6 = 6; |
| static const int RESERVED_7 = 7; |
| static const int CLOSE = 8; |
| static const int PING = 9; |
| static const int PONG = 10; |
| static const int RESERVED_B = 11; |
| static const int RESERVED_C = 12; |
| static const int RESERVED_D = 13; |
| static const int RESERVED_E = 14; |
| static const int RESERVED_F = 15; |
| } |
| |
| /// The web socket protocol transformer handles the protocol byte stream |
| /// which is supplied through the `handleData`. As the protocol is processed, |
| /// it'll output frame data as either a List<int> or String. |
| /// |
| /// Important information about usage: Be sure you use cancelOnError, so the |
| /// socket will be closed when the processor encounter an error. Not using it |
| /// will lead to undefined behaviour. |
| class _WebSocketProtocolTransformer extends StreamTransformerBase<List<int>, |
| dynamic /*List<int>|_WebSocketPing|_WebSocketPong*/ > |
| implements EventSink<List<int>> { |
| static const int START = 0; |
| static const int LEN_FIRST = 1; |
| static const int LEN_REST = 2; |
| static const int MASK = 3; |
| static const int PAYLOAD = 4; |
| static const int CLOSED = 5; |
| static const int FAILURE = 6; |
| static const int FIN = 0x80; |
| static const int RSV1 = 0x40; |
| static const int RSV2 = 0x20; |
| static const int RSV3 = 0x10; |
| static const int OPCODE = 0xF; |
| |
| int _state = START; |
| bool _fin = false; |
| int _opcode = -1; |
| int _len = -1; |
| bool _masked = false; |
| int _remainingLenBytes = -1; |
| int _remainingMaskingKeyBytes = 4; |
| int _remainingPayloadBytes = -1; |
| int _unmaskingIndex = 0; |
| int _currentMessageType = _WebSocketMessageType.NONE; |
| int closeCode = WebSocketStatus.NO_STATUS_RECEIVED; |
| String closeReason = ''; |
| |
| EventSink<dynamic /*List<int>|_WebSocketPing|_WebSocketPong*/ >? _eventSink; |
| |
| final bool _serverSide; |
| final List<int> _maskingBytes = List.filled(4, 0); |
| final BytesBuilder _payload = BytesBuilder(copy: false); |
| |
| _WebSocketProtocolTransformer([this._serverSide = false]); |
| |
| @override |
| Stream<dynamic /*List<int>|_WebSocketPing|_WebSocketPong*/ > bind( |
| Stream<List<int>> stream) => |
| Stream.eventTransformed(stream, (EventSink eventSink) { |
| if (_eventSink != null) { |
| throw StateError('WebSocket transformer already used.'); |
| } |
| _eventSink = eventSink; |
| return this; |
| }); |
| |
| @override |
| void addError(Object error, [StackTrace? stackTrace]) { |
| _eventSink!.addError(error, stackTrace); |
| } |
| |
| @override |
| void close() { |
| _eventSink!.close(); |
| } |
| |
| /// Process data received from the underlying communication channel. |
| @override |
| void add(List<int> bytes) { |
| final buffer = bytes is Uint8List ? bytes : Uint8List.fromList(bytes); |
| var index = 0; |
| final lastIndex = buffer.length; |
| if (_state == CLOSED) { |
| throw WebSocketChannelException('Data on closed connection'); |
| } |
| if (_state == FAILURE) { |
| throw WebSocketChannelException('Data on failed connection'); |
| } |
| while ((index < lastIndex) && _state != CLOSED && _state != FAILURE) { |
| final byte = buffer[index]; |
| if (_state <= LEN_REST) { |
| if (_state == START) { |
| _fin = (byte & FIN) != 0; |
| |
| if ((byte & (RSV2 | RSV3)) != 0) { |
| // The RSV2, RSV3 bits must both be zero. |
| throw WebSocketChannelException('Protocol error'); |
| } |
| |
| _opcode = byte & OPCODE; |
| |
| if (_opcode <= _WebSocketOpcode.BINARY) { |
| if (_opcode == _WebSocketOpcode.CONTINUATION) { |
| if (_currentMessageType == _WebSocketMessageType.NONE) { |
| throw WebSocketChannelException('Protocol error'); |
| } |
| } else { |
| assert(_opcode == _WebSocketOpcode.TEXT || |
| _opcode == _WebSocketOpcode.BINARY); |
| if (_currentMessageType != _WebSocketMessageType.NONE) { |
| throw WebSocketChannelException('Protocol error'); |
| } |
| _currentMessageType = _opcode; |
| } |
| } else if (_opcode >= _WebSocketOpcode.CLOSE && |
| _opcode <= _WebSocketOpcode.PONG) { |
| // Control frames cannot be fragmented. |
| if (!_fin) throw WebSocketChannelException('Protocol error'); |
| } else { |
| throw WebSocketChannelException('Protocol error'); |
| } |
| _state = LEN_FIRST; |
| } else if (_state == LEN_FIRST) { |
| _masked = (byte & 0x80) != 0; |
| _len = byte & 0x7F; |
| if (_isControlFrame() && _len > 125) { |
| throw WebSocketChannelException('Protocol error'); |
| } |
| if (_len == 126) { |
| _len = 0; |
| _remainingLenBytes = 2; |
| _state = LEN_REST; |
| } else if (_len == 127) { |
| _len = 0; |
| _remainingLenBytes = 8; |
| _state = LEN_REST; |
| } else { |
| assert(_len < 126); |
| _lengthDone(); |
| } |
| } else { |
| assert(_state == LEN_REST); |
| _len = _len << 8 | byte; |
| _remainingLenBytes--; |
| if (_remainingLenBytes == 0) { |
| _lengthDone(); |
| } |
| } |
| } else { |
| if (_state == MASK) { |
| _maskingBytes[4 - _remainingMaskingKeyBytes--] = byte; |
| if (_remainingMaskingKeyBytes == 0) { |
| _maskDone(); |
| } |
| } else { |
| assert(_state == PAYLOAD); |
| // The payload is not handled one byte at a time but in blocks. |
| final payloadLength = min(lastIndex - index, _remainingPayloadBytes); |
| _remainingPayloadBytes -= payloadLength; |
| // Unmask payload if masked. |
| if (_masked) { |
| _unmask(index, payloadLength, buffer); |
| } |
| // Control frame and data frame share _payloads. |
| _payload.add(Uint8List.view(buffer.buffer, index, payloadLength)); |
| index += payloadLength; |
| if (_isControlFrame()) { |
| if (_remainingPayloadBytes == 0) _controlFrameEnd(); |
| } else { |
| if (_currentMessageType != _WebSocketMessageType.TEXT && |
| _currentMessageType != _WebSocketMessageType.BINARY) { |
| throw WebSocketChannelException('Protocol error'); |
| } |
| if (_remainingPayloadBytes == 0) _messageFrameEnd(); |
| } |
| |
| // Hack - as we always do index++ below. |
| index--; |
| } |
| } |
| |
| // Move to the next byte. |
| index++; |
| } |
| } |
| |
| void _unmask(int index, int length, Uint8List buffer) { |
| const BLOCK_SIZE = 16; |
| // Skip Int32x4-version if message is small. |
| if (length >= BLOCK_SIZE) { |
| // Start by aligning to 16 bytes. |
| final startOffset = BLOCK_SIZE - (index & 15); |
| final end = index + startOffset; |
| for (var i = index; i < end; i++) { |
| buffer[i] ^= _maskingBytes[_unmaskingIndex++ & 3]; |
| } |
| index += startOffset; |
| length -= startOffset; |
| final blockCount = length ~/ BLOCK_SIZE; |
| if (blockCount > 0) { |
| // Create mask block. |
| var mask = 0; |
| for (var i = 3; i >= 0; i--) { |
| mask = (mask << 8) | _maskingBytes[(_unmaskingIndex + i) & 3]; |
| } |
| final blockMask = Int32x4(mask, mask, mask, mask); |
| final blockBuffer = Int32x4List.view(buffer.buffer, index, blockCount); |
| for (var i = 0; i < blockBuffer.length; i++) { |
| blockBuffer[i] ^= blockMask; |
| } |
| final bytes = blockCount * BLOCK_SIZE; |
| index += bytes; |
| length -= bytes; |
| } |
| } |
| // Handle end. |
| final end = index + length; |
| for (var i = index; i < end; i++) { |
| buffer[i] ^= _maskingBytes[_unmaskingIndex++ & 3]; |
| } |
| } |
| |
| void _lengthDone() { |
| if (_masked) { |
| if (!_serverSide) { |
| throw WebSocketChannelException('Received masked frame from server'); |
| } |
| _state = MASK; |
| } else { |
| if (_serverSide) { |
| throw WebSocketChannelException('Received unmasked frame from client'); |
| } |
| _remainingPayloadBytes = _len; |
| _startPayload(); |
| } |
| } |
| |
| void _maskDone() { |
| _remainingPayloadBytes = _len; |
| _startPayload(); |
| } |
| |
| void _startPayload() { |
| // If there is no actual payload perform perform callbacks without |
| // going through the PAYLOAD state. |
| if (_remainingPayloadBytes == 0) { |
| if (_isControlFrame()) { |
| switch (_opcode) { |
| case _WebSocketOpcode.CLOSE: |
| _state = CLOSED; |
| _eventSink!.close(); |
| break; |
| case _WebSocketOpcode.PING: |
| _eventSink!.add(_WebSocketPing()); |
| break; |
| case _WebSocketOpcode.PONG: |
| _eventSink!.add(_WebSocketPong()); |
| break; |
| } |
| _prepareForNextFrame(); |
| } else { |
| _messageFrameEnd(); |
| } |
| } else { |
| _state = PAYLOAD; |
| } |
| } |
| |
| void _messageFrameEnd() { |
| if (_fin) { |
| final bytes = _payload.takeBytes(); |
| |
| switch (_currentMessageType) { |
| case _WebSocketMessageType.TEXT: |
| _eventSink!.add(utf8.decode(bytes)); |
| break; |
| case _WebSocketMessageType.BINARY: |
| _eventSink!.add(bytes); |
| break; |
| } |
| _currentMessageType = _WebSocketMessageType.NONE; |
| } |
| _prepareForNextFrame(); |
| } |
| |
| void _controlFrameEnd() { |
| switch (_opcode) { |
| case _WebSocketOpcode.CLOSE: |
| closeCode = WebSocketStatus.NO_STATUS_RECEIVED; |
| final payload = _payload.takeBytes(); |
| if (payload.isNotEmpty) { |
| if (payload.length == 1) { |
| throw WebSocketChannelException('Protocol error'); |
| } |
| closeCode = payload[0] << 8 | payload[1]; |
| if (closeCode == WebSocketStatus.NO_STATUS_RECEIVED) { |
| throw WebSocketChannelException('Protocol error'); |
| } |
| if (payload.length > 2) { |
| closeReason = utf8.decode(payload.sublist(2)); |
| } |
| } |
| _state = CLOSED; |
| _eventSink!.close(); |
| break; |
| |
| case _WebSocketOpcode.PING: |
| _eventSink!.add(_WebSocketPing(_payload.takeBytes())); |
| break; |
| |
| case _WebSocketOpcode.PONG: |
| _eventSink!.add(_WebSocketPong(_payload.takeBytes())); |
| break; |
| } |
| _prepareForNextFrame(); |
| } |
| |
| bool _isControlFrame() => |
| _opcode == _WebSocketOpcode.CLOSE || |
| _opcode == _WebSocketOpcode.PING || |
| _opcode == _WebSocketOpcode.PONG; |
| |
| void _prepareForNextFrame() { |
| if (_state != CLOSED && _state != FAILURE) _state = START; |
| _fin = false; |
| _opcode = -1; |
| _len = -1; |
| _remainingLenBytes = -1; |
| _remainingMaskingKeyBytes = 4; |
| _remainingPayloadBytes = -1; |
| _unmaskingIndex = 0; |
| } |
| } |
| |
| class _WebSocketPing { |
| final List<int>? payload; |
| |
| _WebSocketPing([this.payload]); |
| } |
| |
| class _WebSocketPong { |
| final List<int>? payload; |
| |
| _WebSocketPong([this.payload]); |
| } |
| |
| // TODO(ajohnsen): Make this transformer reusable. |
| class _WebSocketOutgoingTransformer |
| extends StreamTransformerBase<dynamic, List<int>> implements EventSink { |
| final WebSocketImpl webSocket; |
| EventSink<List<int>>? _eventSink; |
| |
| _WebSocketOutgoingTransformer(this.webSocket); |
| |
| @override |
| Stream<List<int>> bind(Stream stream) => |
| Stream<List<int>>.eventTransformed(stream, |
| (EventSink<List<int>> eventSink) { |
| if (_eventSink != null) { |
| throw StateError('WebSocket transformer already used'); |
| } |
| _eventSink = eventSink; |
| return this; |
| }); |
| |
| @override |
| void add(message) { |
| if (message is _WebSocketPong) { |
| addFrame(_WebSocketOpcode.PONG, message.payload); |
| return; |
| } |
| if (message is _WebSocketPing) { |
| addFrame(_WebSocketOpcode.PING, message.payload); |
| return; |
| } |
| List<int>? data; |
| int opcode; |
| if (message != null) { |
| if (message is String) { |
| opcode = _WebSocketOpcode.TEXT; |
| data = utf8.encode(message); |
| } else if (message is List<int>) { |
| opcode = _WebSocketOpcode.BINARY; |
| data = message; |
| } else { |
| throw ArgumentError(message); |
| } |
| } else { |
| opcode = _WebSocketOpcode.TEXT; |
| } |
| addFrame(opcode, data); |
| } |
| |
| @override |
| void addError(Object error, [StackTrace? stackTrace]) { |
| _eventSink!.addError(error, stackTrace); |
| } |
| |
| @override |
| void close() { |
| final code = webSocket._outCloseCode; |
| final reason = webSocket._outCloseReason; |
| List<int>? data; |
| if (code != null) { |
| data = <int>[]; |
| data.add((code >> 8) & 0xFF); |
| data.add(code & 0xFF); |
| if (reason != null) { |
| data.addAll(utf8.encode(reason)); |
| } |
| } |
| addFrame(_WebSocketOpcode.CLOSE, data); |
| _eventSink!.close(); |
| } |
| |
| void addFrame(int opcode, List<int>? data) { |
| createFrame( |
| opcode, |
| data, |
| webSocket._serverSide, |
| // Logic around _deflateHelper was removed here, since there will |
| // never be a deflate helper for a cross-platform WebSocket client. |
| false) |
| .forEach((e) { |
| _eventSink!.add(e); |
| }); |
| } |
| |
| static Iterable<List<int>> createFrame( |
| int opcode, List<int>? data, bool serverSide, bool compressed) { |
| final mask = !serverSide; // Masking not implemented for server. |
| final dataLength = data == null ? 0 : data.length; |
| // Determine the header size. |
| var headerSize = mask ? 6 : 2; |
| if (dataLength > 65535) { |
| headerSize += 8; |
| } else if (dataLength > 125) { |
| headerSize += 2; |
| } |
| final header = Uint8List(headerSize); |
| var index = 0; |
| |
| // Set FIN and opcode. |
| final hoc = _WebSocketProtocolTransformer.FIN | |
| (compressed ? _WebSocketProtocolTransformer.RSV1 : 0) | |
| (opcode & _WebSocketProtocolTransformer.OPCODE); |
| |
| header[index++] = hoc; |
| // Determine size and position of length field. |
| var lengthBytes = 1; |
| if (dataLength > 65535) { |
| header[index++] = 127; |
| lengthBytes = 8; |
| } else if (dataLength > 125) { |
| header[index++] = 126; |
| lengthBytes = 2; |
| } |
| // Write the length in network byte order into the header. |
| for (var i = 0; i < lengthBytes; i++) { |
| header[index++] = dataLength >> (((lengthBytes - 1) - i) * 8) & 0xFF; |
| } |
| if (mask) { |
| header[1] |= 1 << 7; |
| final maskBytes = [ |
| _random.nextInt(256), |
| _random.nextInt(256), |
| _random.nextInt(256), |
| _random.nextInt(256) |
| ]; |
| header.setRange(index, index + 4, maskBytes); |
| index += 4; |
| if (data != null) { |
| Uint8List list; |
| // If this is a text message just do the masking inside the |
| // encoded data. |
| if (opcode == _WebSocketOpcode.TEXT && data is Uint8List) { |
| list = data; |
| } else { |
| if (data is Uint8List) { |
| list = Uint8List.fromList(data); |
| } else { |
| list = Uint8List(data.length); |
| for (var i = 0; i < data.length; i++) { |
| if (data[i] < 0 || 255 < data[i]) { |
| throw ArgumentError('List element is not a byte value ' |
| '(value ${data[i]} at index $i)'); |
| } |
| list[i] = data[i]; |
| } |
| } |
| } |
| const BLOCK_SIZE = 16; |
| final blockCount = list.length ~/ BLOCK_SIZE; |
| if (blockCount > 0) { |
| // Create mask block. |
| var mask = 0; |
| for (var i = 3; i >= 0; i--) { |
| mask = (mask << 8) | maskBytes[i]; |
| } |
| final blockMask = Int32x4(mask, mask, mask, mask); |
| final blockBuffer = Int32x4List.view(list.buffer, 0, blockCount); |
| for (var i = 0; i < blockBuffer.length; i++) { |
| blockBuffer[i] ^= blockMask; |
| } |
| } |
| // Handle end. |
| for (var i = blockCount * BLOCK_SIZE; i < list.length; i++) { |
| list[i] ^= maskBytes[i & 3]; |
| } |
| data = list; |
| } |
| } |
| assert(index == headerSize); |
| if (data == null) { |
| return [header]; |
| } else { |
| return [header, data]; |
| } |
| } |
| } |
| |
| class _WebSocketConsumer implements StreamConsumer { |
| final WebSocketImpl webSocket; |
| final StreamSink<List<int>> sink; |
| StreamController? _controller; |
| |
| // ignore: cancel_subscriptions |
| StreamSubscription? _subscription; |
| bool _issuedPause = false; |
| bool _closed = false; |
| final Completer _closeCompleter = Completer<WebSocketImpl>(); |
| Completer<WebSocketImpl>? _completer; |
| |
| _WebSocketConsumer(this.webSocket, this.sink); |
| |
| void _onListen() { |
| if (_subscription != null) { |
| _subscription!.cancel(); |
| } |
| } |
| |
| void _onPause() { |
| if (_subscription != null) { |
| _subscription!.pause(); |
| } else { |
| _issuedPause = true; |
| } |
| } |
| |
| void _onResume() { |
| if (_subscription != null) { |
| _subscription!.resume(); |
| } else { |
| _issuedPause = false; |
| } |
| } |
| |
| void _cancel() { |
| if (_subscription != null) { |
| final subscription = _subscription; |
| _subscription = null; |
| subscription!.cancel(); |
| } |
| } |
| |
| void _ensureController() { |
| if (_controller != null) return; |
| _controller = StreamController( |
| sync: true, |
| onPause: _onPause, |
| onResume: _onResume, |
| onCancel: _onListen); |
| final stream = |
| _WebSocketOutgoingTransformer(webSocket).bind(_controller!.stream); |
| sink.addStream(stream).then((_) { |
| _done(); |
| _closeCompleter.complete(webSocket); |
| }, onError: (error, StackTrace stackTrace) { |
| _closed = true; |
| _cancel(); |
| if (error is ArgumentError) { |
| if (!_done(error, stackTrace)) { |
| _closeCompleter.completeError(error, stackTrace); |
| } |
| } else { |
| _done(); |
| _closeCompleter.complete(webSocket); |
| } |
| }); |
| } |
| |
| bool _done([Object? error, StackTrace? stackTrace]) { |
| if (_completer == null) return false; |
| if (error != null) { |
| _completer!.completeError(error, stackTrace); |
| } else { |
| _completer!.complete(webSocket); |
| } |
| _completer = null; |
| return true; |
| } |
| |
| @override |
| Future addStream(var stream) { |
| if (_closed) { |
| stream.listen(null).cancel(); |
| return Future.value(webSocket); |
| } |
| _ensureController(); |
| _completer = Completer(); |
| _subscription = stream.listen((data) { |
| _controller!.add(data); |
| }, onDone: _done, onError: _done, cancelOnError: true); |
| if (_issuedPause) { |
| _subscription!.pause(); |
| _issuedPause = false; |
| } |
| return _completer!.future; |
| } |
| |
| @override |
| Future close() { |
| _ensureController(); |
| Future closeSocket() => |
| sink.close().catchError((_) {}).then((_) => webSocket); |
| |
| _controller!.close(); |
| return _closeCompleter.future.then((_) => closeSocket()); |
| } |
| |
| void add(data) { |
| if (_closed) return; |
| _ensureController(); |
| _controller!.add(data); |
| } |
| |
| void closeSocket() { |
| _closed = true; |
| _cancel(); |
| close(); |
| } |
| } |
| |
| class WebSocketImpl extends Stream with _ServiceObject implements StreamSink { |
| // Use default Map so we keep order. |
| static final Map<int, WebSocketImpl> _webSockets = <int, WebSocketImpl>{}; |
| static const int DEFAULT_WINDOW_BITS = 15; |
| static const String PER_MESSAGE_DEFLATE = 'permessage-deflate'; |
| |
| final String? protocol; |
| |
| late final StreamController _controller; |
| |
| // ignore: cancel_subscriptions |
| StreamSubscription? _subscription; |
| late final StreamSink _sink; |
| |
| final bool _serverSide; |
| int _readyState = WebSocket.CONNECTING; |
| bool _writeClosed = false; |
| int? _closeCode; |
| String? _closeReason; |
| Duration? _pingInterval; |
| Timer? _pingTimer; |
| late final _WebSocketConsumer _consumer; |
| |
| int? _outCloseCode; |
| String? _outCloseReason; |
| Timer? _closeTimer; |
| |
| WebSocketImpl.fromSocket( |
| Stream<List<int>> stream, StreamSink<List<int>> sink, this.protocol, |
| [this._serverSide = false]) { |
| _consumer = _WebSocketConsumer(this, sink); |
| _sink = StreamSinkImpl(_consumer); |
| _readyState = WebSocket.OPEN; |
| |
| final transformer = _WebSocketProtocolTransformer(_serverSide); |
| _subscription = transformer.bind(stream).listen((data) { |
| if (data is _WebSocketPing) { |
| if (!_writeClosed) _consumer.add(_WebSocketPong(data.payload)); |
| } else if (data is _WebSocketPong) { |
| // Simply set pingInterval, as it'll cancel any timers. |
| pingInterval = _pingInterval; |
| } else { |
| _controller.add(data); |
| } |
| }, onError: (error, stackTrace) { |
| if (_closeTimer != null) _closeTimer!.cancel(); |
| if (error is FormatException) { |
| _close(WebSocketStatus.INVALID_FRAME_PAYLOAD_DATA); |
| } else { |
| _close(WebSocketStatus.PROTOCOL_ERROR); |
| } |
| // An error happened, set the close code set above. |
| _closeCode = _outCloseCode; |
| _closeReason = _outCloseReason; |
| _controller.close(); |
| }, onDone: () { |
| if (_closeTimer != null) _closeTimer!.cancel(); |
| if (_readyState == WebSocket.OPEN) { |
| _readyState = WebSocket.CLOSING; |
| if (!_isReservedStatusCode(transformer.closeCode)) { |
| _close(transformer.closeCode, transformer.closeReason); |
| } else { |
| _close(); |
| } |
| _readyState = WebSocket.CLOSED; |
| } |
| // Protocol close, use close code from transformer. |
| _closeCode = transformer.closeCode; |
| _closeReason = transformer.closeReason; |
| _controller.close(); |
| }, cancelOnError: true); |
| _subscription!.pause(); |
| _controller = StreamController( |
| sync: true, |
| onListen: () => _subscription!.resume(), |
| onCancel: () { |
| _subscription!.cancel(); |
| _subscription = null; |
| }, |
| onPause: _subscription!.pause, |
| onResume: _subscription!.resume); |
| |
| _webSockets[_serviceId] = this; |
| } |
| |
| @override |
| StreamSubscription listen(void Function(dynamic)? onData, |
| {Function? onError, void Function()? onDone, bool? cancelOnError}) => |
| _controller.stream.listen(onData, |
| onError: onError, onDone: onDone, cancelOnError: cancelOnError); |
| |
| Duration? get pingInterval => _pingInterval; |
| |
| set pingInterval(Duration? interval) { |
| if (_writeClosed) return; |
| if (_pingTimer != null) _pingTimer!.cancel(); |
| _pingInterval = interval; |
| |
| if (_pingInterval == null) return; |
| |
| _pingTimer = Timer(_pingInterval!, () { |
| if (_writeClosed) return; |
| _consumer.add(_WebSocketPing()); |
| _pingTimer = Timer(_pingInterval!, () { |
| // No pong received. |
| _close(WebSocketStatus.GOING_AWAY); |
| }); |
| }); |
| } |
| |
| int get readyState => _readyState; |
| |
| String? get extensions => null; |
| |
| int? get closeCode => _closeCode; |
| |
| String? get closeReason => _closeReason; |
| |
| @override |
| void add(data) { |
| _sink.add(data); |
| } |
| |
| @override |
| void addError(Object error, [StackTrace? stackTrace]) { |
| _sink.addError(error, stackTrace); |
| } |
| |
| @override |
| Future addStream(Stream stream) => _sink.addStream(stream); |
| |
| @override |
| Future get done => _sink.done; |
| |
| @override |
| Future close([int? code, String? reason]) { |
| if (_isReservedStatusCode(code)) { |
| throw WebSocketChannelException('Reserved status code $code'); |
| } |
| if (_outCloseCode == null) { |
| _outCloseCode = code; |
| _outCloseReason = reason; |
| } |
| if (!_controller.isClosed) { |
| // If a close has not yet been received from the other end then |
| // 1) make sure to listen on the stream so the close frame will be |
| // processed if received. |
| // 2) set a timer terminate the connection if a close frame is |
| // not received. |
| if (!_controller.hasListener && _subscription != null) { |
| _controller.stream.drain().catchError((_) => {}); |
| } |
| // When closing the web-socket, we no longer accept data. |
| _closeTimer ??= Timer(const Duration(seconds: 5), () { |
| // Reuse code and reason from the local close. |
| _closeCode = _outCloseCode; |
| _closeReason = _outCloseReason; |
| if (_subscription != null) _subscription!.cancel(); |
| _controller.close(); |
| _webSockets.remove(_serviceId); |
| }); |
| } |
| return _sink.close(); |
| } |
| |
| void _close([int? code, String? reason]) { |
| if (_writeClosed) return; |
| if (_outCloseCode == null) { |
| _outCloseCode = code; |
| _outCloseReason = reason; |
| } |
| _writeClosed = true; |
| _consumer.closeSocket(); |
| _webSockets.remove(_serviceId); |
| } |
| |
| // The _toJSON, _serviceTypePath, and _serviceTypeName methods have been |
| // deleted for web_socket_channel. The methods were unused in WebSocket code |
| // and produced warnings. |
| |
| static bool _isReservedStatusCode(int? code) => |
| code != null && |
| (code < WebSocketStatus.NORMAL_CLOSURE || |
| code == WebSocketStatus.RESERVED_1004 || |
| code == WebSocketStatus.NO_STATUS_RECEIVED || |
| code == WebSocketStatus.ABNORMAL_CLOSURE || |
| (code > WebSocketStatus.INTERNAL_SERVER_ERROR && |
| code < WebSocketStatus.RESERVED_1015) || |
| (code >= WebSocketStatus.RESERVED_1015 && code < 3000)); |
| } |
| |
| // The following code is from sdk/lib/io/service_object.dart. |
| |
| int _nextServiceId = 1; |
| |
| // TODO(ajohnsen): Use other way of getting a uniq id. |
| abstract class _ServiceObject { |
| int __serviceId = 0; |
| |
| int get _serviceId { |
| if (__serviceId == 0) __serviceId = _nextServiceId++; |
| return __serviceId; |
| } |
| |
| // The _toJSON, _servicePath, _serviceTypePath, _serviceTypeName, and |
| // _serviceType methods have been deleted for http_parser. The methods were |
| // unused in WebSocket code and produced warnings. |
| } |
