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| 1 /* | |
| 2 * Copyright 2016 The WebRTC project authors. All Rights Reserved. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license | |
| 5 * that can be found in the LICENSE file in the root of the source | |
| 6 * tree. An additional intellectual property rights grant can be found | |
| 7 * in the file PATENTS. All contributing project authors may | |
| 8 * be found in the AUTHORS file in the root of the source tree. | |
| 9 */ | |
| 10 | |
| 11 #ifndef WEBRTC_API_QUICDATACHANNEL_H_ | |
| 12 #define WEBRTC_API_QUICDATACHANNEL_H_ | |
| 13 | |
| 14 #include <string> | |
| 15 #include <unordered_map> | |
| 16 #include <unordered_set> | |
| 17 | |
| 18 #include "webrtc/api/datachannelinterface.h" | |
| 19 #include "webrtc/base/asyncinvoker.h" | |
| 20 #include "webrtc/base/sigslot.h" | |
| 21 #include "webrtc/base/thread.h" | |
| 22 | |
| 23 namespace cricket { | |
| 24 class QuicTransportChannel; | |
| 25 class ReliableQuicStream; | |
| 26 class TransportChannel; | |
| 27 } // namepsace cricket | |
| 28 | |
| 29 namespace net { | |
| 30 // TODO(mikescarlett): Make this uint64_t once QUIC uses 64-bit ids. | |
| 31 typedef uint32_t QuicStreamId; | |
| 32 } // namespace net | |
| 33 | |
| 34 namespace rtc { | |
| 35 class CopyOnWriteBuffer; | |
| 36 } // namespace rtc | |
| 37 | |
| 38 namespace webrtc { | |
| 39 | |
| 40 // Encodes a QUIC message header with the data channel ID and message ID, then | |
| 41 // stores the result in |header|. | |
| 42 void WriteQuicDataChannelMessageHeader(int data_channel_id, | |
| 43 uint64_t message_id, | |
| 44 rtc::CopyOnWriteBuffer* header); | |
| 45 | |
| 46 // Decodes the data channel ID and message ID from the initial data received by | |
| 47 // an incoming QUIC stream. The data channel ID is output to |data_channel_id|, | |
| 48 // the message ID is output to |message_id|, and the number of bytes read is | |
| 49 // output to |bytes_read|. Returns false if either ID cannot be read. | |
| 50 bool ParseQuicDataMessageHeader(const char* data, | |
| 51 size_t len, | |
| 52 int* data_channel_id, | |
| 53 uint64_t* message_id, | |
| 54 size_t* bytes_read); | |
| 55 | |
| 56 // QuicDataChannel is an implementation of DataChannelInterface based on the | |
| 57 // QUIC protocol. It uses a QuicTransportChannel to establish encryption and | |
| 58 // transfer data, and a QuicDataTransport to receive incoming messages at | |
| 59 // the correct data channel. Currently this class implements unordered, reliable | |
| 60 // delivery and does not send an "OPEN" message. | |
| 61 // | |
| 62 // Each time a message is sent: | |
| 63 // | |
| 64 // - The QuicDataChannel prepends it with the data channel id and message id. | |
| 65 // The QuicTransportChannel creates a ReliableQuicStream, then the | |
| 66 // ReliableQuicStream sends the message with a FIN. | |
| 67 // | |
| 68 // - The remote QuicSession creates a ReliableQuicStream to receive the data. | |
| 69 // The remote QuicDataTransport dispatches the ReliableQuicStream to the | |
| 70 // QuicDataChannel with the same id as this data channel. | |
| 71 // | |
| 72 // - The remote QuicDataChannel queues data from the ReliableQuicStream. Once | |
| 73 // it receives a QUIC stream frame with a FIN, it provides the message to the | |
| 74 // DataChannelObserver. | |
| 75 // | |
| 76 // TODO(mikescarlett): Implement ordered delivery, unreliable delivery, and | |
| 77 // an OPEN message similar to the one for SCTP. | |
| 78 class QuicDataChannel : public rtc::RefCountedObject<DataChannelInterface>, | |
| 79 public sigslot::has_slots<> { | |
| 80 public: | |
| 81 // Message stores buffered data from the incoming QUIC stream. The QUIC stream | |
| 82 // is provided so that remaining data can be received from the remote peer. | |
| 83 struct Message { | |
| 84 uint64_t id; | |
| 85 rtc::CopyOnWriteBuffer buffer; | |
| 86 cricket::ReliableQuicStream* stream; | |
| 87 }; | |
| 88 | |
| 89 QuicDataChannel(rtc::Thread* signaling_thread, | |
| 90 rtc::Thread* worker_thread, | |
| 91 rtc::Thread* network_thread, | |
| 92 const std::string& label, | |
| 93 const DataChannelInit& config); | |
| 94 ~QuicDataChannel() override; | |
| 95 | |
| 96 // DataChannelInterface overrides. | |
| 97 std::string label() const override { return label_; } | |
| 98 bool reliable() const override { return true; } | |
| 99 bool ordered() const override { return false; } | |
| 100 uint16_t maxRetransmitTime() const override { return -1; } | |
| 101 uint16_t maxRetransmits() const override { return -1; } | |
| 102 bool negotiated() const override { return false; } | |
| 103 int id() const override { return id_; } | |
| 104 DataState state() const override { return state_; } | |
| 105 uint64_t buffered_amount() const override { return buffered_amount_; } | |
| 106 std::string protocol() const override { return protocol_; } | |
| 107 void RegisterObserver(DataChannelObserver* observer) override; | |
| 108 void UnregisterObserver() override; | |
| 109 void Close() override; | |
| 110 bool Send(const DataBuffer& buffer) override; | |
| 111 | |
| 112 // Called from QuicDataTransport to set the QUIC transport channel that the | |
| 113 // QuicDataChannel sends messages with. Returns false if a different QUIC | |
| 114 // transport channel is already set or |channel| is NULL. | |
| 115 // | |
| 116 // The QUIC transport channel is not set in the constructor to allow creating | |
| 117 // the QuicDataChannel before the PeerConnection has a QUIC transport channel, | |
| 118 // such as before the session description is not set. | |
| 119 bool SetTransportChannel(cricket::QuicTransportChannel* channel); | |
| 120 | |
| 121 // Called from QuicDataTransport when an incoming ReliableQuicStream is | |
| 122 // receiving a message received for this data channel. Once this function is | |
| 123 // called, |message| is owned by the QuicDataChannel and should not be | |
| 124 // accessed by the QuicDataTransport. | |
| 125 void OnIncomingMessage(Message&& message); | |
| 126 | |
| 127 // Methods for testing. | |
| 128 // Gets the number of outgoing QUIC streams with write blocked data that are | |
| 129 // currently open for this data channel and are not finished writing a | |
| 130 // message. This is equivalent to the size of |write_blocked_quic_streams_|. | |
| 131 size_t GetNumWriteBlockedStreams() const; | |
| 132 // Gets the number of incoming QUIC streams with buffered data that are | |
| 133 // currently open for this data channel and are not finished receiving a | |
| 134 // message. This is equivalent to the size of |incoming_quic_messages_|. | |
| 135 size_t GetNumIncomingStreams() const; | |
| 136 | |
| 137 private: | |
| 138 // Callbacks from ReliableQuicStream. | |
| 139 // Called when an incoming QUIC stream in |incoming_quic_messages_| has | |
| 140 // received a QUIC stream frame. | |
| 141 void OnDataReceived(net::QuicStreamId stream_id, | |
| 142 const char* data, | |
| 143 size_t len); | |
| 144 // Called when a write blocked QUIC stream that has been added to | |
| 145 // |write_blocked_quic_streams_| is closed. | |
| 146 void OnWriteBlockedStreamClosed(net::QuicStreamId stream_id, int error); | |
| 147 // Called when an incoming QUIC stream that has been added to | |
| 148 // |incoming_quic_messages_| is closed. | |
| 149 void OnIncomingQueuedStreamClosed(net::QuicStreamId stream_id, int error); | |
| 150 // Called when a write blocked QUIC stream in |write_blocked_quic_streams_| | |
| 151 // has written previously queued data. | |
| 152 void OnQueuedBytesWritten(net::QuicStreamId stream_id, | |
| 153 uint64_t queued_bytes_written); | |
| 154 | |
| 155 // Callbacks from |quic_transport_channel_|. | |
| 156 void OnReadyToSend(cricket::TransportChannel* channel); | |
| 157 void OnConnectionClosed(); | |
| 158 | |
| 159 // Network thread methods. | |
| 160 // Sends the data buffer to the remote peer using an outgoing QUIC stream. | |
| 161 // Returns true if the data buffer can be successfully sent, or if it is | |
| 162 // queued to be sent later. | |
| 163 bool Send_n(const DataBuffer& buffer); | |
| 164 | |
| 165 // Worker thread methods. | |
| 166 // Connects the |quic_transport_channel_| signals to this QuicDataChannel, | |
| 167 // then returns the new QuicDataChannel state. | |
| 168 DataState SetTransportChannel_w(); | |
| 169 // Closes the QUIC streams associated with this QuicDataChannel. | |
| 170 void Close_w(); | |
| 171 // Sets |buffered_amount_|. | |
| 172 void SetBufferedAmount_w(uint64_t buffered_amount); | |
| 173 | |
| 174 // Signaling thread methods. | |
| 175 // Triggers QuicDataChannelObserver::OnMessage when a message from the remote | |
| 176 // peer is ready to be read. | |
| 177 void OnMessage_s(const DataBuffer& received_data); | |
| 178 // Triggers QuicDataChannel::OnStateChange if the state change is valid. | |
| 179 // Otherwise does nothing if |state| == |state_| or |state| != kClosed when | |
| 180 // the data channel is closing. | |
| 181 void SetState_s(DataState state); | |
| 182 // Triggers QuicDataChannelObserver::OnBufferedAmountChange when the total | |
| 183 // buffered data changes for a QUIC stream. | |
| 184 void OnBufferedAmountChange_s(uint64_t buffered_amount); | |
| 185 | |
| 186 // QUIC transport channel which owns the QUIC session. It is used to create | |
| 187 // a QUIC stream for sending outgoing messages. | |
| 188 cricket::QuicTransportChannel* quic_transport_channel_ = nullptr; | |
| 189 // Signaling thread for DataChannelInterface methods. | |
| 190 rtc::Thread* const signaling_thread_; | |
| 191 // Worker thread for |quic_transport_channel_| callbacks. | |
| 192 rtc::Thread* const worker_thread_; | |
| 193 // Network thread for sending data and |quic_transport_channel_| callbacks. | |
| 194 rtc::Thread* const network_thread_; | |
| 195 rtc::AsyncInvoker invoker_; | |
| 196 // Map of QUIC stream ID => ReliableQuicStream* for write blocked QUIC | |
| 197 // streams. | |
| 198 std::unordered_map<net::QuicStreamId, cricket::ReliableQuicStream*> | |
| 199 write_blocked_quic_streams_; | |
| 200 // Map of QUIC stream ID => Message for each incoming QUIC stream. | |
| 201 std::unordered_map<net::QuicStreamId, Message> incoming_quic_messages_; | |
| 202 // Handles received data from the remote peer and data channel state changes. | |
| 203 DataChannelObserver* observer_ = nullptr; | |
| 204 // QuicDataChannel ID. | |
| 205 int id_; | |
| 206 // Connectivity state of the QuicDataChannel. | |
| 207 DataState state_; | |
| 208 // Total bytes that are buffered among the QUIC streams. | |
| 209 uint64_t buffered_amount_; | |
| 210 // Counter for number of sent messages that is used for message IDs. | |
| 211 uint64_t next_message_id_; | |
| 212 | |
| 213 // Variables for application use. | |
| 214 const std::string& label_; | |
| 215 const std::string& protocol_; | |
| 216 }; | |
| 217 | |
| 218 } // namespace webrtc | |
| 219 | |
| 220 #endif // WEBRTC_API_QUICDATACHANNEL_H_ | |
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Chromium Code Reviews
Issue 2514883002:
Create //webrtc/api:libjingle_peerconnection_api + refactorings. (Closed)
