| // 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 |
| // b40c20bfbccd0e4d98d194b9d362d04a9f7c91f3. |
| |
| import 'dart:async'; |
| import 'dart:convert'; |
| import 'dart:math'; |
| import 'dart:typed_data'; |
| |
| import '../exception.dart'; |
| import 'bytes_builder.dart'; |
| import 'io_sink.dart'; |
| import 'web_socket.dart'; |
| |
| const String webSocketGUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"; |
| const String _webSocketGUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"; |
| const String _clientNoContextTakeover = "client_no_context_takeover"; |
| const String _serverNoContextTakeover = "server_no_context_takeover"; |
| const String _clientMaxWindowBits = "client_max_window_bits"; |
| const String _serverMaxWindowBits = "server_max_window_bits"; |
| |
| final _random = new 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; |
| } |
| |
| class _EncodedString { |
| final List<int> bytes; |
| _EncodedString(this.bytes); |
| } |
| |
| /** |
| * 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. |
| */ |
| // TODO(ajohnsen): make this transformer reusable? |
| class _WebSocketProtocolTransformer |
| implements EventSink<List<int>>, StreamTransformer< |
| List<int>, dynamic/*List<int>|_WebSocketPing|_WebSocketPong>*/> { |
| 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; |
| bool _compressed = 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 _maskingBytes = new List(4); |
| final BytesBuilder _payload = new BytesBuilder(copy: false); |
| |
| _WebSocketProtocolTransformer([this._serverSide = false]); |
| |
| Stream<dynamic/*List<int>|_WebSocketPing|_WebSocketPong>*/> bind( |
| Stream<List<int>> stream) { |
| return new Stream.eventTransformed(stream, (EventSink eventSink) { |
| if (_eventSink != null) { |
| throw new StateError("WebSocket transformer already used."); |
| } |
| _eventSink = eventSink; |
| return this; |
| }); |
| } |
| |
| void addError(Object error, [StackTrace stackTrace]) { |
| _eventSink.addError(error, stackTrace); |
| } |
| |
| void close() { _eventSink.close(); } |
| |
| /** |
| * Process data received from the underlying communication channel. |
| */ |
| void add(List<int> bytes) { |
| var buffer = bytes is Uint8List ? bytes : new Uint8List.fromList(bytes); |
| int index = 0; |
| int lastIndex = buffer.length; |
| if (_state == CLOSED) { |
| throw new WebSocketChannelException("Data on closed connection"); |
| } |
| if (_state == FAILURE) { |
| throw new WebSocketChannelException("Data on failed connection"); |
| } |
| while ((index < lastIndex) && _state != CLOSED && _state != FAILURE) { |
| int 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 new WebSocketChannelException("Protocol error"); |
| } |
| |
| _opcode = (byte & OPCODE); |
| |
| if (_opcode != _WebSocketOpcode.CONTINUATION) { |
| if ((byte & RSV1) != 0) { |
| _compressed = true; |
| } else { |
| _compressed = false; |
| } |
| } |
| |
| if (_opcode <= _WebSocketOpcode.BINARY) { |
| if (_opcode == _WebSocketOpcode.CONTINUATION) { |
| if (_currentMessageType == _WebSocketMessageType.NONE) { |
| throw new WebSocketChannelException("Protocol error"); |
| } |
| } else { |
| assert(_opcode == _WebSocketOpcode.TEXT || |
| _opcode == _WebSocketOpcode.BINARY); |
| if (_currentMessageType != _WebSocketMessageType.NONE) { |
| throw new WebSocketChannelException("Protocol error"); |
| } |
| _currentMessageType = _opcode; |
| } |
| } else if (_opcode >= _WebSocketOpcode.CLOSE && |
| _opcode <= _WebSocketOpcode.PONG) { |
| // Control frames cannot be fragmented. |
| if (!_fin) throw new WebSocketChannelException("Protocol error"); |
| } else { |
| throw new WebSocketChannelException("Protocol error"); |
| } |
| _state = LEN_FIRST; |
| } else if (_state == LEN_FIRST) { |
| _masked = (byte & 0x80) != 0; |
| _len = byte & 0x7F; |
| if (_isControlFrame() && _len > 125) { |
| throw new 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. |
| int 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(new Uint8List.view(buffer.buffer, index, payloadLength)); |
| index += payloadLength; |
| if (_isControlFrame()) { |
| if (_remainingPayloadBytes == 0) _controlFrameEnd(); |
| } else { |
| if (_currentMessageType != _WebSocketMessageType.TEXT && |
| _currentMessageType != _WebSocketMessageType.BINARY) { |
| throw new 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 int BLOCK_SIZE = 16; |
| // Skip Int32x4-version if message is small. |
| if (length >= BLOCK_SIZE) { |
| // Start by aligning to 16 bytes. |
| final int startOffset = BLOCK_SIZE - (index & 15); |
| final int end = index + startOffset; |
| for (int i = index; i < end; i++) { |
| buffer[i] ^= _maskingBytes[_unmaskingIndex++ & 3]; |
| } |
| index += startOffset; |
| length -= startOffset; |
| final int blockCount = length ~/ BLOCK_SIZE; |
| if (blockCount > 0) { |
| // Create mask block. |
| int mask = 0; |
| for (int i = 3; i >= 0; i--) { |
| mask = (mask << 8) | _maskingBytes[(_unmaskingIndex + i) & 3]; |
| } |
| Int32x4 blockMask = new Int32x4(mask, mask, mask, mask); |
| Int32x4List blockBuffer = |
| new Int32x4List.view(buffer.buffer, index, blockCount); |
| for (int i = 0; i < blockBuffer.length; i++) { |
| blockBuffer[i] ^= blockMask; |
| } |
| final int bytes = blockCount * BLOCK_SIZE; |
| index += bytes; |
| length -= bytes; |
| } |
| } |
| // Handle end. |
| final int end = index + length; |
| for (int i = index; i < end; i++) { |
| buffer[i] ^= _maskingBytes[_unmaskingIndex++ & 3]; |
| } |
| } |
| |
| void _lengthDone() { |
| if (_masked) { |
| if (!_serverSide) { |
| throw new WebSocketChannelException( |
| "Received masked frame from server"); |
| } |
| _state = MASK; |
| } else { |
| if (_serverSide) { |
| throw new 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(new _WebSocketPing()); |
| break; |
| case _WebSocketOpcode.PONG: |
| _eventSink.add(new _WebSocketPong()); |
| break; |
| } |
| _prepareForNextFrame(); |
| } else { |
| _messageFrameEnd(); |
| } |
| } else { |
| _state = PAYLOAD; |
| } |
| } |
| |
| void _messageFrameEnd() { |
| if (_fin) { |
| var 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; |
| var payload = _payload.takeBytes(); |
| if (payload.length > 0) { |
| if (payload.length == 1) { |
| throw new WebSocketChannelException("Protocol error"); |
| } |
| closeCode = payload[0] << 8 | payload[1]; |
| if (closeCode == WebSocketStatus.NO_STATUS_RECEIVED) { |
| throw new WebSocketChannelException("Protocol error"); |
| } |
| if (payload.length > 2) { |
| closeReason = UTF8.decode(payload.sublist(2)); |
| } |
| } |
| _state = CLOSED; |
| _eventSink.close(); |
| break; |
| |
| case _WebSocketOpcode.PING: |
| _eventSink.add(new _WebSocketPing(_payload.takeBytes())); |
| break; |
| |
| case _WebSocketOpcode.PONG: |
| _eventSink.add(new _WebSocketPong(_payload.takeBytes())); |
| break; |
| } |
| _prepareForNextFrame(); |
| } |
| |
| bool _isControlFrame() { |
| return _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 = null]); |
| } |
| |
| class _WebSocketPong { |
| final List<int> payload; |
| _WebSocketPong([this.payload = null]); |
| } |
| |
| // TODO(ajohnsen): Make this transformer reusable. |
| class _WebSocketOutgoingTransformer |
| implements StreamTransformer<dynamic, List<int>>, EventSink { |
| final WebSocketImpl webSocket; |
| EventSink<List<int>> _eventSink; |
| |
| _WebSocketOutgoingTransformer(this.webSocket); |
| |
| Stream<List<int>> bind(Stream stream) { |
| return new Stream<List<int>>.eventTransformed( |
| stream, (EventSink<List<int>> eventSink) { |
| if (_eventSink != null) { |
| throw new StateError("WebSocket transformer already used"); |
| } |
| _eventSink = eventSink; |
| return this; |
| }); |
| } |
| |
| 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 if (message is _EncodedString) { |
| opcode = _WebSocketOpcode.TEXT; |
| data = message.bytes; |
| } else { |
| throw new ArgumentError(message); |
| } |
| } else { |
| opcode = _WebSocketOpcode.TEXT; |
| } |
| addFrame(opcode, data); |
| } |
| |
| void addError(Object error, [StackTrace stackTrace]) { |
| _eventSink.addError(error, stackTrace); |
| } |
| |
| void close() { |
| int code = webSocket._outCloseCode; |
| String reason = webSocket._outCloseReason; |
| List<int> data; |
| if (code != null) { |
| data = new List<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, |
| false) |
| .forEach((e) { _eventSink.add(e); }); |
| |
| static Iterable<List<int>> createFrame( |
| int opcode, List<int> data, bool serverSide, bool compressed) { |
| bool mask = !serverSide; // Masking not implemented for server. |
| int dataLength = data == null ? 0 : data.length; |
| // Determine the header size. |
| int headerSize = (mask) ? 6 : 2; |
| if (dataLength > 65535) { |
| headerSize += 8; |
| } else if (dataLength > 125) { |
| headerSize += 2; |
| } |
| Uint8List header = new Uint8List(headerSize); |
| int index = 0; |
| |
| // Set FIN and opcode. |
| var hoc = _WebSocketProtocolTransformer.FIN |
| | (compressed ? _WebSocketProtocolTransformer.RSV1 : 0) |
| | (opcode & _WebSocketProtocolTransformer.OPCODE); |
| |
| header[index++] = hoc; |
| // Determine size and position of length field. |
| int 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 (int i = 0; i < lengthBytes; i++) { |
| header[index++] = dataLength >> (((lengthBytes - 1) - i) * 8) & 0xFF; |
| } |
| if (mask) { |
| header[1] |= 1 << 7; |
| var 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 = new Uint8List.fromList(data); |
| } else { |
| list = new Uint8List(data.length); |
| for (int i = 0; i < data.length; i++) { |
| if (data[i] < 0 || 255 < data[i]) { |
| throw new ArgumentError("List element is not a byte value " |
| "(value ${data[i]} at index $i)"); |
| } |
| list[i] = data[i]; |
| } |
| } |
| } |
| const int BLOCK_SIZE = 16; |
| int blockCount = list.length ~/ BLOCK_SIZE; |
| if (blockCount > 0) { |
| // Create mask block. |
| int mask = 0; |
| for (int i = 3; i >= 0; i--) { |
| mask = (mask << 8) | maskBytes[i]; |
| } |
| Int32x4 blockMask = new Int32x4(mask, mask, mask, mask); |
| Int32x4List blockBuffer = |
| new Int32x4List.view(list.buffer, 0, blockCount); |
| for (int i = 0; i < blockBuffer.length; i++) { |
| blockBuffer[i] ^= blockMask; |
| } |
| } |
| // Handle end. |
| for (int 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; |
| StreamSubscription _subscription; |
| bool _issuedPause = false; |
| bool _closed = false; |
| Completer _closeCompleter = new Completer(); |
| Completer _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) { |
| var subscription = _subscription; |
| _subscription = null; |
| subscription.cancel(); |
| } |
| } |
| |
| _ensureController() { |
| if (_controller != null) return; |
| _controller = new StreamController( |
| sync: true, |
| onPause: _onPause, |
| onResume: _onResume, |
| onCancel: _onListen); |
| var stream = _controller.stream |
| .transform(new _WebSocketOutgoingTransformer(webSocket)); |
| 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([error, StackTrace stackTrace]) { |
| if (_completer == null) return false; |
| if (error != null) { |
| _completer.completeError(error, stackTrace); |
| } else { |
| _completer.complete(webSocket); |
| } |
| _completer = null; |
| return true; |
| } |
| |
| Future addStream(var stream) { |
| if (_closed) { |
| stream.listen(null).cancel(); |
| return new Future.value(webSocket); |
| } |
| _ensureController(); |
| _completer = new Completer(); |
| _subscription = stream.listen((data) { |
| _controller.add(data); |
| }, onDone: _done, onError: _done, cancelOnError: true); |
| if (_issuedPause) { |
| _subscription.pause(); |
| _issuedPause = false; |
| } |
| return _completer.future; |
| } |
| |
| Future close() { |
| _ensureController(); |
| Future closeSocket() { |
| return 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 Map<int, WebSocketImpl> _webSockets = new Map<int, WebSocketImpl>(); |
| static const int DEFAULT_WINDOW_BITS = 15; |
| static const String PER_MESSAGE_DEFLATE = "permessage-deflate"; |
| |
| final String protocol; |
| |
| StreamController _controller; |
| StreamSubscription _subscription; |
| StreamSink _sink; |
| |
| final bool _serverSide; |
| int _readyState = WebSocket.CONNECTING; |
| bool _writeClosed = false; |
| int _closeCode; |
| String _closeReason; |
| Duration _pingInterval; |
| Timer _pingTimer; |
| _WebSocketConsumer _consumer; |
| |
| int _outCloseCode; |
| String _outCloseReason; |
| Timer _closeTimer; |
| |
| WebSocketImpl.fromSocket( |
| Stream<List<int>> stream, StreamSink<List<int>> sink, this.protocol, |
| [this._serverSide = false]) { |
| _consumer = new _WebSocketConsumer(this, sink); |
| _sink = new StreamSinkImpl(_consumer); |
| _readyState = WebSocket.OPEN; |
| |
| var transformer = new _WebSocketProtocolTransformer(_serverSide); |
| _subscription = stream.transform(transformer).listen((data) { |
| if (data is _WebSocketPing) { |
| if (!_writeClosed) _consumer.add(new _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 = new StreamController( |
| sync: true, onListen: () => _subscription.resume(), onCancel: () { |
| _subscription.cancel(); |
| _subscription = null; |
| }, onPause: _subscription.pause, onResume: _subscription.resume); |
| |
| _webSockets[_serviceId] = this; |
| } |
| |
| StreamSubscription listen(void onData(message), |
| {Function onError, void onDone(), bool cancelOnError}) { |
| return _controller.stream.listen(onData, |
| onError: onError, onDone: onDone, cancelOnError: cancelOnError); |
| } |
| |
| Duration get pingInterval => _pingInterval; |
| |
| void set pingInterval(Duration interval) { |
| if (_writeClosed) return; |
| if (_pingTimer != null) _pingTimer.cancel(); |
| _pingInterval = interval; |
| |
| if (_pingInterval == null) return; |
| |
| _pingTimer = new Timer(_pingInterval, () { |
| if (_writeClosed) return; |
| _consumer.add(new _WebSocketPing()); |
| _pingTimer = new 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; |
| |
| void add(data) { _sink.add(data); } |
| void addUtf8Text(List<int> bytes) { |
| if (bytes is! List<int>) { |
| throw new ArgumentError.value(bytes, "bytes", "Is not a list of bytes"); |
| } |
| _sink.add(new _EncodedString(bytes)); |
| } |
| void addError(error, [StackTrace stackTrace]) { |
| _sink.addError(error, stackTrace); |
| } |
| Future addStream(Stream stream) => _sink.addStream(stream); |
| Future get done => _sink.done; |
| |
| Future close([int code, String reason]) { |
| if (_isReservedStatusCode(code)) { |
| throw new 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((_) => {}); |
| } |
| if (_closeTimer == null) { |
| // When closing the web-socket, we no longer accept data. |
| _closeTimer = new 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) { |
| return 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. |
| } |
