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| 1 /* | |
| 2 * Copyright 2012 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 #include "webrtc/api/datachannel.h" | |
| 12 | |
| 13 #include <memory> | |
| 14 #include <string> | |
| 15 | |
| 16 #include "webrtc/api/sctputils.h" | |
| 17 #include "webrtc/base/checks.h" | |
| 18 #include "webrtc/base/logging.h" | |
| 19 #include "webrtc/base/refcount.h" | |
| 20 #include "webrtc/media/sctp/sctptransportinternal.h" | |
| 21 | |
| 22 namespace webrtc { | |
| 23 | |
| 24 static size_t kMaxQueuedReceivedDataBytes = 16 * 1024 * 1024; | |
| 25 static size_t kMaxQueuedSendDataBytes = 16 * 1024 * 1024; | |
| 26 | |
| 27 enum { | |
| 28 MSG_CHANNELREADY, | |
| 29 }; | |
| 30 | |
| 31 bool SctpSidAllocator::AllocateSid(rtc::SSLRole role, int* sid) { | |
| 32 int potential_sid = (role == rtc::SSL_CLIENT) ? 0 : 1; | |
| 33 while (!IsSidAvailable(potential_sid)) { | |
| 34 potential_sid += 2; | |
| 35 if (potential_sid > static_cast<int>(cricket::kMaxSctpSid)) { | |
| 36 return false; | |
| 37 } | |
| 38 } | |
| 39 | |
| 40 *sid = potential_sid; | |
| 41 used_sids_.insert(potential_sid); | |
| 42 return true; | |
| 43 } | |
| 44 | |
| 45 bool SctpSidAllocator::ReserveSid(int sid) { | |
| 46 if (!IsSidAvailable(sid)) { | |
| 47 return false; | |
| 48 } | |
| 49 used_sids_.insert(sid); | |
| 50 return true; | |
| 51 } | |
| 52 | |
| 53 void SctpSidAllocator::ReleaseSid(int sid) { | |
| 54 auto it = used_sids_.find(sid); | |
| 55 if (it != used_sids_.end()) { | |
| 56 used_sids_.erase(it); | |
| 57 } | |
| 58 } | |
| 59 | |
| 60 bool SctpSidAllocator::IsSidAvailable(int sid) const { | |
| 61 if (sid < static_cast<int>(cricket::kMinSctpSid) || | |
| 62 sid > static_cast<int>(cricket::kMaxSctpSid)) { | |
| 63 return false; | |
| 64 } | |
| 65 return used_sids_.find(sid) == used_sids_.end(); | |
| 66 } | |
| 67 | |
| 68 DataChannel::PacketQueue::PacketQueue() : byte_count_(0) {} | |
| 69 | |
| 70 DataChannel::PacketQueue::~PacketQueue() { | |
| 71 Clear(); | |
| 72 } | |
| 73 | |
| 74 bool DataChannel::PacketQueue::Empty() const { | |
| 75 return packets_.empty(); | |
| 76 } | |
| 77 | |
| 78 DataBuffer* DataChannel::PacketQueue::Front() { | |
| 79 return packets_.front(); | |
| 80 } | |
| 81 | |
| 82 void DataChannel::PacketQueue::Pop() { | |
| 83 if (packets_.empty()) { | |
| 84 return; | |
| 85 } | |
| 86 | |
| 87 byte_count_ -= packets_.front()->size(); | |
| 88 packets_.pop_front(); | |
| 89 } | |
| 90 | |
| 91 void DataChannel::PacketQueue::Push(DataBuffer* packet) { | |
| 92 byte_count_ += packet->size(); | |
| 93 packets_.push_back(packet); | |
| 94 } | |
| 95 | |
| 96 void DataChannel::PacketQueue::Clear() { | |
| 97 while (!packets_.empty()) { | |
| 98 delete packets_.front(); | |
| 99 packets_.pop_front(); | |
| 100 } | |
| 101 byte_count_ = 0; | |
| 102 } | |
| 103 | |
| 104 void DataChannel::PacketQueue::Swap(PacketQueue* other) { | |
| 105 size_t other_byte_count = other->byte_count_; | |
| 106 other->byte_count_ = byte_count_; | |
| 107 byte_count_ = other_byte_count; | |
| 108 | |
| 109 other->packets_.swap(packets_); | |
| 110 } | |
| 111 | |
| 112 rtc::scoped_refptr<DataChannel> DataChannel::Create( | |
| 113 DataChannelProviderInterface* provider, | |
| 114 cricket::DataChannelType dct, | |
| 115 const std::string& label, | |
| 116 const InternalDataChannelInit& config) { | |
| 117 rtc::scoped_refptr<DataChannel> channel( | |
| 118 new rtc::RefCountedObject<DataChannel>(provider, dct, label)); | |
| 119 if (!channel->Init(config)) { | |
| 120 return NULL; | |
| 121 } | |
| 122 return channel; | |
| 123 } | |
| 124 | |
| 125 DataChannel::DataChannel( | |
| 126 DataChannelProviderInterface* provider, | |
| 127 cricket::DataChannelType dct, | |
| 128 const std::string& label) | |
| 129 : label_(label), | |
| 130 observer_(nullptr), | |
| 131 state_(kConnecting), | |
| 132 messages_sent_(0), | |
| 133 bytes_sent_(0), | |
| 134 messages_received_(0), | |
| 135 bytes_received_(0), | |
| 136 data_channel_type_(dct), | |
| 137 provider_(provider), | |
| 138 handshake_state_(kHandshakeInit), | |
| 139 connected_to_provider_(false), | |
| 140 send_ssrc_set_(false), | |
| 141 receive_ssrc_set_(false), | |
| 142 writable_(false), | |
| 143 send_ssrc_(0), | |
| 144 receive_ssrc_(0) { | |
| 145 } | |
| 146 | |
| 147 bool DataChannel::Init(const InternalDataChannelInit& config) { | |
| 148 if (data_channel_type_ == cricket::DCT_RTP) { | |
| 149 if (config.reliable || | |
| 150 config.id != -1 || | |
| 151 config.maxRetransmits != -1 || | |
| 152 config.maxRetransmitTime != -1) { | |
| 153 LOG(LS_ERROR) << "Failed to initialize the RTP data channel due to " | |
| 154 << "invalid DataChannelInit."; | |
| 155 return false; | |
| 156 } | |
| 157 handshake_state_ = kHandshakeReady; | |
| 158 } else if (data_channel_type_ == cricket::DCT_SCTP) { | |
| 159 if (config.id < -1 || | |
| 160 config.maxRetransmits < -1 || | |
| 161 config.maxRetransmitTime < -1) { | |
| 162 LOG(LS_ERROR) << "Failed to initialize the SCTP data channel due to " | |
| 163 << "invalid DataChannelInit."; | |
| 164 return false; | |
| 165 } | |
| 166 if (config.maxRetransmits != -1 && config.maxRetransmitTime != -1) { | |
| 167 LOG(LS_ERROR) << | |
| 168 "maxRetransmits and maxRetransmitTime should not be both set."; | |
| 169 return false; | |
| 170 } | |
| 171 config_ = config; | |
| 172 | |
| 173 switch (config_.open_handshake_role) { | |
| 174 case webrtc::InternalDataChannelInit::kNone: // pre-negotiated | |
| 175 handshake_state_ = kHandshakeReady; | |
| 176 break; | |
| 177 case webrtc::InternalDataChannelInit::kOpener: | |
| 178 handshake_state_ = kHandshakeShouldSendOpen; | |
| 179 break; | |
| 180 case webrtc::InternalDataChannelInit::kAcker: | |
| 181 handshake_state_ = kHandshakeShouldSendAck; | |
| 182 break; | |
| 183 }; | |
| 184 | |
| 185 // Try to connect to the transport in case the transport channel already | |
| 186 // exists. | |
| 187 OnTransportChannelCreated(); | |
| 188 | |
| 189 // Checks if the transport is ready to send because the initial channel | |
| 190 // ready signal may have been sent before the DataChannel creation. | |
| 191 // This has to be done async because the upper layer objects (e.g. | |
| 192 // Chrome glue and WebKit) are not wired up properly until after this | |
| 193 // function returns. | |
| 194 if (provider_->ReadyToSendData()) { | |
| 195 rtc::Thread::Current()->Post(RTC_FROM_HERE, this, MSG_CHANNELREADY, NULL); | |
| 196 } | |
| 197 } | |
| 198 | |
| 199 return true; | |
| 200 } | |
| 201 | |
| 202 DataChannel::~DataChannel() {} | |
| 203 | |
| 204 void DataChannel::RegisterObserver(DataChannelObserver* observer) { | |
| 205 observer_ = observer; | |
| 206 DeliverQueuedReceivedData(); | |
| 207 } | |
| 208 | |
| 209 void DataChannel::UnregisterObserver() { | |
| 210 observer_ = NULL; | |
| 211 } | |
| 212 | |
| 213 bool DataChannel::reliable() const { | |
| 214 if (data_channel_type_ == cricket::DCT_RTP) { | |
| 215 return false; | |
| 216 } else { | |
| 217 return config_.maxRetransmits == -1 && | |
| 218 config_.maxRetransmitTime == -1; | |
| 219 } | |
| 220 } | |
| 221 | |
| 222 uint64_t DataChannel::buffered_amount() const { | |
| 223 return queued_send_data_.byte_count(); | |
| 224 } | |
| 225 | |
| 226 void DataChannel::Close() { | |
| 227 if (state_ == kClosed) | |
| 228 return; | |
| 229 send_ssrc_ = 0; | |
| 230 send_ssrc_set_ = false; | |
| 231 SetState(kClosing); | |
| 232 UpdateState(); | |
| 233 } | |
| 234 | |
| 235 bool DataChannel::Send(const DataBuffer& buffer) { | |
| 236 if (state_ != kOpen) { | |
| 237 return false; | |
| 238 } | |
| 239 | |
| 240 // TODO(jiayl): the spec is unclear about if the remote side should get the | |
| 241 // onmessage event. We need to figure out the expected behavior and change the | |
| 242 // code accordingly. | |
| 243 if (buffer.size() == 0) { | |
| 244 return true; | |
| 245 } | |
| 246 | |
| 247 // If the queue is non-empty, we're waiting for SignalReadyToSend, | |
| 248 // so just add to the end of the queue and keep waiting. | |
| 249 if (!queued_send_data_.Empty()) { | |
| 250 // Only SCTP DataChannel queues the outgoing data when the transport is | |
| 251 // blocked. | |
| 252 RTC_DCHECK(data_channel_type_ == cricket::DCT_SCTP); | |
| 253 if (!QueueSendDataMessage(buffer)) { | |
| 254 Close(); | |
| 255 } | |
| 256 return true; | |
| 257 } | |
| 258 | |
| 259 bool success = SendDataMessage(buffer, true); | |
| 260 if (data_channel_type_ == cricket::DCT_RTP) { | |
| 261 return success; | |
| 262 } | |
| 263 | |
| 264 // Always return true for SCTP DataChannel per the spec. | |
| 265 return true; | |
| 266 } | |
| 267 | |
| 268 void DataChannel::SetReceiveSsrc(uint32_t receive_ssrc) { | |
| 269 RTC_DCHECK(data_channel_type_ == cricket::DCT_RTP); | |
| 270 | |
| 271 if (receive_ssrc_set_) { | |
| 272 return; | |
| 273 } | |
| 274 receive_ssrc_ = receive_ssrc; | |
| 275 receive_ssrc_set_ = true; | |
| 276 UpdateState(); | |
| 277 } | |
| 278 | |
| 279 // The remote peer request that this channel shall be closed. | |
| 280 void DataChannel::RemotePeerRequestClose() { | |
| 281 DoClose(); | |
| 282 } | |
| 283 | |
| 284 void DataChannel::SetSctpSid(int sid) { | |
| 285 RTC_DCHECK(config_.id < 0 && sid >= 0 && | |
| 286 data_channel_type_ == cricket::DCT_SCTP); | |
| 287 if (config_.id == sid) { | |
| 288 return; | |
| 289 } | |
| 290 | |
| 291 config_.id = sid; | |
| 292 provider_->AddSctpDataStream(sid); | |
| 293 } | |
| 294 | |
| 295 void DataChannel::OnTransportChannelCreated() { | |
| 296 RTC_DCHECK(data_channel_type_ == cricket::DCT_SCTP); | |
| 297 if (!connected_to_provider_) { | |
| 298 connected_to_provider_ = provider_->ConnectDataChannel(this); | |
| 299 } | |
| 300 // The sid may have been unassigned when provider_->ConnectDataChannel was | |
| 301 // done. So always add the streams even if connected_to_provider_ is true. | |
| 302 if (config_.id >= 0) { | |
| 303 provider_->AddSctpDataStream(config_.id); | |
| 304 } | |
| 305 } | |
| 306 | |
| 307 void DataChannel::OnTransportChannelDestroyed() { | |
| 308 // This method needs to synchronously close the data channel, which means any | |
| 309 // queued data needs to be discarded. | |
| 310 queued_send_data_.Clear(); | |
| 311 queued_control_data_.Clear(); | |
| 312 DoClose(); | |
| 313 } | |
| 314 | |
| 315 void DataChannel::SetSendSsrc(uint32_t send_ssrc) { | |
| 316 RTC_DCHECK(data_channel_type_ == cricket::DCT_RTP); | |
| 317 if (send_ssrc_set_) { | |
| 318 return; | |
| 319 } | |
| 320 send_ssrc_ = send_ssrc; | |
| 321 send_ssrc_set_ = true; | |
| 322 UpdateState(); | |
| 323 } | |
| 324 | |
| 325 void DataChannel::OnMessage(rtc::Message* msg) { | |
| 326 switch (msg->message_id) { | |
| 327 case MSG_CHANNELREADY: | |
| 328 OnChannelReady(true); | |
| 329 break; | |
| 330 } | |
| 331 } | |
| 332 | |
| 333 void DataChannel::OnDataReceived(const cricket::ReceiveDataParams& params, | |
| 334 const rtc::CopyOnWriteBuffer& payload) { | |
| 335 if (data_channel_type_ == cricket::DCT_RTP && params.ssrc != receive_ssrc_) { | |
| 336 return; | |
| 337 } | |
| 338 if (data_channel_type_ == cricket::DCT_SCTP && params.sid != config_.id) { | |
| 339 return; | |
| 340 } | |
| 341 | |
| 342 if (params.type == cricket::DMT_CONTROL) { | |
| 343 RTC_DCHECK(data_channel_type_ == cricket::DCT_SCTP); | |
| 344 if (handshake_state_ != kHandshakeWaitingForAck) { | |
| 345 // Ignore it if we are not expecting an ACK message. | |
| 346 LOG(LS_WARNING) << "DataChannel received unexpected CONTROL message, " | |
| 347 << "sid = " << params.sid; | |
| 348 return; | |
| 349 } | |
| 350 if (ParseDataChannelOpenAckMessage(payload)) { | |
| 351 // We can send unordered as soon as we receive the ACK message. | |
| 352 handshake_state_ = kHandshakeReady; | |
| 353 LOG(LS_INFO) << "DataChannel received OPEN_ACK message, sid = " | |
| 354 << params.sid; | |
| 355 } else { | |
| 356 LOG(LS_WARNING) << "DataChannel failed to parse OPEN_ACK message, sid = " | |
| 357 << params.sid; | |
| 358 } | |
| 359 return; | |
| 360 } | |
| 361 | |
| 362 RTC_DCHECK(params.type == cricket::DMT_BINARY || | |
| 363 params.type == cricket::DMT_TEXT); | |
| 364 | |
| 365 LOG(LS_VERBOSE) << "DataChannel received DATA message, sid = " << params.sid; | |
| 366 // We can send unordered as soon as we receive any DATA message since the | |
| 367 // remote side must have received the OPEN (and old clients do not send | |
| 368 // OPEN_ACK). | |
| 369 if (handshake_state_ == kHandshakeWaitingForAck) { | |
| 370 handshake_state_ = kHandshakeReady; | |
| 371 } | |
| 372 | |
| 373 bool binary = (params.type == cricket::DMT_BINARY); | |
| 374 std::unique_ptr<DataBuffer> buffer(new DataBuffer(payload, binary)); | |
| 375 if (state_ == kOpen && observer_) { | |
| 376 ++messages_received_; | |
| 377 bytes_received_ += buffer->size(); | |
| 378 observer_->OnMessage(*buffer.get()); | |
| 379 } else { | |
| 380 if (queued_received_data_.byte_count() + payload.size() > | |
| 381 kMaxQueuedReceivedDataBytes) { | |
| 382 LOG(LS_ERROR) << "Queued received data exceeds the max buffer size."; | |
| 383 | |
| 384 queued_received_data_.Clear(); | |
| 385 if (data_channel_type_ != cricket::DCT_RTP) { | |
| 386 Close(); | |
| 387 } | |
| 388 | |
| 389 return; | |
| 390 } | |
| 391 queued_received_data_.Push(buffer.release()); | |
| 392 } | |
| 393 } | |
| 394 | |
| 395 void DataChannel::OnStreamClosedRemotely(int sid) { | |
| 396 if (data_channel_type_ == cricket::DCT_SCTP && sid == config_.id) { | |
| 397 Close(); | |
| 398 } | |
| 399 } | |
| 400 | |
| 401 void DataChannel::OnChannelReady(bool writable) { | |
| 402 writable_ = writable; | |
| 403 if (!writable) { | |
| 404 return; | |
| 405 } | |
| 406 | |
| 407 SendQueuedControlMessages(); | |
| 408 SendQueuedDataMessages(); | |
| 409 UpdateState(); | |
| 410 } | |
| 411 | |
| 412 void DataChannel::DoClose() { | |
| 413 if (state_ == kClosed) | |
| 414 return; | |
| 415 | |
| 416 receive_ssrc_set_ = false; | |
| 417 send_ssrc_set_ = false; | |
| 418 SetState(kClosing); | |
| 419 UpdateState(); | |
| 420 } | |
| 421 | |
| 422 void DataChannel::UpdateState() { | |
| 423 // UpdateState determines what to do from a few state variables. Include | |
| 424 // all conditions required for each state transition here for | |
| 425 // clarity. OnChannelReady(true) will send any queued data and then invoke | |
| 426 // UpdateState(). | |
| 427 switch (state_) { | |
| 428 case kConnecting: { | |
| 429 if (send_ssrc_set_ == receive_ssrc_set_) { | |
| 430 if (data_channel_type_ == cricket::DCT_RTP && !connected_to_provider_) { | |
| 431 connected_to_provider_ = provider_->ConnectDataChannel(this); | |
| 432 } | |
| 433 if (connected_to_provider_) { | |
| 434 if (handshake_state_ == kHandshakeShouldSendOpen) { | |
| 435 rtc::CopyOnWriteBuffer payload; | |
| 436 WriteDataChannelOpenMessage(label_, config_, &payload); | |
| 437 SendControlMessage(payload); | |
| 438 } else if (handshake_state_ == kHandshakeShouldSendAck) { | |
| 439 rtc::CopyOnWriteBuffer payload; | |
| 440 WriteDataChannelOpenAckMessage(&payload); | |
| 441 SendControlMessage(payload); | |
| 442 } | |
| 443 if (writable_ && | |
| 444 (handshake_state_ == kHandshakeReady || | |
| 445 handshake_state_ == kHandshakeWaitingForAck)) { | |
| 446 SetState(kOpen); | |
| 447 // If we have received buffers before the channel got writable. | |
| 448 // Deliver them now. | |
| 449 DeliverQueuedReceivedData(); | |
| 450 } | |
| 451 } | |
| 452 } | |
| 453 break; | |
| 454 } | |
| 455 case kOpen: { | |
| 456 break; | |
| 457 } | |
| 458 case kClosing: { | |
| 459 if (queued_send_data_.Empty() && queued_control_data_.Empty()) { | |
| 460 if (connected_to_provider_) { | |
| 461 DisconnectFromProvider(); | |
| 462 } | |
| 463 | |
| 464 if (!connected_to_provider_ && !send_ssrc_set_ && !receive_ssrc_set_) { | |
| 465 SetState(kClosed); | |
| 466 } | |
| 467 } | |
| 468 break; | |
| 469 } | |
| 470 case kClosed: | |
| 471 break; | |
| 472 } | |
| 473 } | |
| 474 | |
| 475 void DataChannel::SetState(DataState state) { | |
| 476 if (state_ == state) { | |
| 477 return; | |
| 478 } | |
| 479 | |
| 480 state_ = state; | |
| 481 if (observer_) { | |
| 482 observer_->OnStateChange(); | |
| 483 } | |
| 484 if (state_ == kOpen) { | |
| 485 SignalOpened(this); | |
| 486 } else if (state_ == kClosed) { | |
| 487 SignalClosed(this); | |
| 488 } | |
| 489 } | |
| 490 | |
| 491 void DataChannel::DisconnectFromProvider() { | |
| 492 if (!connected_to_provider_) | |
| 493 return; | |
| 494 | |
| 495 provider_->DisconnectDataChannel(this); | |
| 496 connected_to_provider_ = false; | |
| 497 | |
| 498 if (data_channel_type_ == cricket::DCT_SCTP && config_.id >= 0) { | |
| 499 provider_->RemoveSctpDataStream(config_.id); | |
| 500 } | |
| 501 } | |
| 502 | |
| 503 void DataChannel::DeliverQueuedReceivedData() { | |
| 504 if (!observer_) { | |
| 505 return; | |
| 506 } | |
| 507 | |
| 508 while (!queued_received_data_.Empty()) { | |
| 509 std::unique_ptr<DataBuffer> buffer(queued_received_data_.Front()); | |
| 510 ++messages_received_; | |
| 511 bytes_received_ += buffer->size(); | |
| 512 observer_->OnMessage(*buffer); | |
| 513 queued_received_data_.Pop(); | |
| 514 } | |
| 515 } | |
| 516 | |
| 517 void DataChannel::SendQueuedDataMessages() { | |
| 518 if (queued_send_data_.Empty()) { | |
| 519 return; | |
| 520 } | |
| 521 | |
| 522 RTC_DCHECK(state_ == kOpen || state_ == kClosing); | |
| 523 | |
| 524 uint64_t start_buffered_amount = buffered_amount(); | |
| 525 while (!queued_send_data_.Empty()) { | |
| 526 DataBuffer* buffer = queued_send_data_.Front(); | |
| 527 if (!SendDataMessage(*buffer, false)) { | |
| 528 // Leave the message in the queue if sending is aborted. | |
| 529 break; | |
| 530 } | |
| 531 queued_send_data_.Pop(); | |
| 532 delete buffer; | |
| 533 } | |
| 534 | |
| 535 if (observer_ && buffered_amount() < start_buffered_amount) { | |
| 536 observer_->OnBufferedAmountChange(start_buffered_amount); | |
| 537 } | |
| 538 } | |
| 539 | |
| 540 bool DataChannel::SendDataMessage(const DataBuffer& buffer, | |
| 541 bool queue_if_blocked) { | |
| 542 cricket::SendDataParams send_params; | |
| 543 | |
| 544 if (data_channel_type_ == cricket::DCT_SCTP) { | |
| 545 send_params.ordered = config_.ordered; | |
| 546 // Send as ordered if it is still going through OPEN/ACK signaling. | |
| 547 if (handshake_state_ != kHandshakeReady && !config_.ordered) { | |
| 548 send_params.ordered = true; | |
| 549 LOG(LS_VERBOSE) << "Sending data as ordered for unordered DataChannel " | |
| 550 << "because the OPEN_ACK message has not been received."; | |
| 551 } | |
| 552 | |
| 553 send_params.max_rtx_count = config_.maxRetransmits; | |
| 554 send_params.max_rtx_ms = config_.maxRetransmitTime; | |
| 555 send_params.sid = config_.id; | |
| 556 } else { | |
| 557 send_params.ssrc = send_ssrc_; | |
| 558 } | |
| 559 send_params.type = buffer.binary ? cricket::DMT_BINARY : cricket::DMT_TEXT; | |
| 560 | |
| 561 cricket::SendDataResult send_result = cricket::SDR_SUCCESS; | |
| 562 bool success = provider_->SendData(send_params, buffer.data, &send_result); | |
| 563 | |
| 564 if (success) { | |
| 565 ++messages_sent_; | |
| 566 bytes_sent_ += buffer.size(); | |
| 567 return true; | |
| 568 } | |
| 569 | |
| 570 if (data_channel_type_ != cricket::DCT_SCTP) { | |
| 571 return false; | |
| 572 } | |
| 573 | |
| 574 if (send_result == cricket::SDR_BLOCK) { | |
| 575 if (!queue_if_blocked || QueueSendDataMessage(buffer)) { | |
| 576 return false; | |
| 577 } | |
| 578 } | |
| 579 // Close the channel if the error is not SDR_BLOCK, or if queuing the | |
| 580 // message failed. | |
| 581 LOG(LS_ERROR) << "Closing the DataChannel due to a failure to send data, " | |
| 582 << "send_result = " << send_result; | |
| 583 Close(); | |
| 584 | |
| 585 return false; | |
| 586 } | |
| 587 | |
| 588 bool DataChannel::QueueSendDataMessage(const DataBuffer& buffer) { | |
| 589 size_t start_buffered_amount = buffered_amount(); | |
| 590 if (start_buffered_amount >= kMaxQueuedSendDataBytes) { | |
| 591 LOG(LS_ERROR) << "Can't buffer any more data for the data channel."; | |
| 592 return false; | |
| 593 } | |
| 594 queued_send_data_.Push(new DataBuffer(buffer)); | |
| 595 | |
| 596 // The buffer can have length zero, in which case there is no change. | |
| 597 if (observer_ && buffered_amount() > start_buffered_amount) { | |
| 598 observer_->OnBufferedAmountChange(start_buffered_amount); | |
| 599 } | |
| 600 return true; | |
| 601 } | |
| 602 | |
| 603 void DataChannel::SendQueuedControlMessages() { | |
| 604 PacketQueue control_packets; | |
| 605 control_packets.Swap(&queued_control_data_); | |
| 606 | |
| 607 while (!control_packets.Empty()) { | |
| 608 std::unique_ptr<DataBuffer> buf(control_packets.Front()); | |
| 609 SendControlMessage(buf->data); | |
| 610 control_packets.Pop(); | |
| 611 } | |
| 612 } | |
| 613 | |
| 614 void DataChannel::QueueControlMessage(const rtc::CopyOnWriteBuffer& buffer) { | |
| 615 queued_control_data_.Push(new DataBuffer(buffer, true)); | |
| 616 } | |
| 617 | |
| 618 bool DataChannel::SendControlMessage(const rtc::CopyOnWriteBuffer& buffer) { | |
| 619 bool is_open_message = handshake_state_ == kHandshakeShouldSendOpen; | |
| 620 | |
| 621 RTC_DCHECK(data_channel_type_ == cricket::DCT_SCTP && writable_ && | |
| 622 config_.id >= 0 && (!is_open_message || !config_.negotiated)); | |
| 623 | |
| 624 cricket::SendDataParams send_params; | |
| 625 send_params.sid = config_.id; | |
| 626 // Send data as ordered before we receive any message from the remote peer to | |
| 627 // make sure the remote peer will not receive any data before it receives the | |
| 628 // OPEN message. | |
| 629 send_params.ordered = config_.ordered || is_open_message; | |
| 630 send_params.type = cricket::DMT_CONTROL; | |
| 631 | |
| 632 cricket::SendDataResult send_result = cricket::SDR_SUCCESS; | |
| 633 bool retval = provider_->SendData(send_params, buffer, &send_result); | |
| 634 if (retval) { | |
| 635 LOG(LS_INFO) << "Sent CONTROL message on channel " << config_.id; | |
| 636 | |
| 637 if (handshake_state_ == kHandshakeShouldSendAck) { | |
| 638 handshake_state_ = kHandshakeReady; | |
| 639 } else if (handshake_state_ == kHandshakeShouldSendOpen) { | |
| 640 handshake_state_ = kHandshakeWaitingForAck; | |
| 641 } | |
| 642 } else if (send_result == cricket::SDR_BLOCK) { | |
| 643 QueueControlMessage(buffer); | |
| 644 } else { | |
| 645 LOG(LS_ERROR) << "Closing the DataChannel due to a failure to send" | |
| 646 << " the CONTROL message, send_result = " << send_result; | |
| 647 Close(); | |
| 648 } | |
| 649 return retval; | |
| 650 } | |
| 651 | |
| 652 } // namespace webrtc | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2514883002:
Create //webrtc/api:libjingle_peerconnection_api + refactorings. (Closed)
