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| 1 /* | |
| 2 * libjingle | |
| 3 * Copyright 2012 Google Inc. | |
| 4 * | |
| 5 * Redistribution and use in source and binary forms, with or without | |
| 6 * modification, are permitted provided that the following conditions are met: | |
| 7 * | |
| 8 * 1. Redistributions of source code must retain the above copyright notice, | |
| 9 * this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright notice, | |
| 11 * this list of conditions and the following disclaimer in the documentation | |
| 12 * and/or other materials provided with the distribution. | |
| 13 * 3. The name of the author may not be used to endorse or promote products | |
| 14 * derived from this software without specific prior written permission. | |
| 15 * | |
| 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
| 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
| 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO | |
| 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; | |
| 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
| 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
| 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |
| 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 26 */ | |
| 27 | |
| 28 #include "talk/app/webrtc/datachannel.h" | |
| 29 | |
| 30 #include <string> | |
| 31 | |
| 32 #include "talk/app/webrtc/mediastreamprovider.h" | |
| 33 #include "talk/app/webrtc/sctputils.h" | |
| 34 #include "webrtc/base/logging.h" | |
| 35 #include "webrtc/base/refcount.h" | |
| 36 #include "webrtc/media/sctp/sctpdataengine.h" | |
| 37 | |
| 38 namespace webrtc { | |
| 39 | |
| 40 static size_t kMaxQueuedReceivedDataBytes = 16 * 1024 * 1024; | |
| 41 static size_t kMaxQueuedSendDataBytes = 16 * 1024 * 1024; | |
| 42 | |
| 43 enum { | |
| 44 MSG_CHANNELREADY, | |
| 45 }; | |
| 46 | |
| 47 bool SctpSidAllocator::AllocateSid(rtc::SSLRole role, int* sid) { | |
| 48 int potential_sid = (role == rtc::SSL_CLIENT) ? 0 : 1; | |
| 49 while (!IsSidAvailable(potential_sid)) { | |
| 50 potential_sid += 2; | |
| 51 if (potential_sid > static_cast<int>(cricket::kMaxSctpSid)) { | |
| 52 return false; | |
| 53 } | |
| 54 } | |
| 55 | |
| 56 *sid = potential_sid; | |
| 57 used_sids_.insert(potential_sid); | |
| 58 return true; | |
| 59 } | |
| 60 | |
| 61 bool SctpSidAllocator::ReserveSid(int sid) { | |
| 62 if (!IsSidAvailable(sid)) { | |
| 63 return false; | |
| 64 } | |
| 65 used_sids_.insert(sid); | |
| 66 return true; | |
| 67 } | |
| 68 | |
| 69 void SctpSidAllocator::ReleaseSid(int sid) { | |
| 70 auto it = used_sids_.find(sid); | |
| 71 if (it != used_sids_.end()) { | |
| 72 used_sids_.erase(it); | |
| 73 } | |
| 74 } | |
| 75 | |
| 76 bool SctpSidAllocator::IsSidAvailable(int sid) const { | |
| 77 if (sid < 0 || sid > static_cast<int>(cricket::kMaxSctpSid)) { | |
| 78 return false; | |
| 79 } | |
| 80 return used_sids_.find(sid) == used_sids_.end(); | |
| 81 } | |
| 82 | |
| 83 DataChannel::PacketQueue::PacketQueue() : byte_count_(0) {} | |
| 84 | |
| 85 DataChannel::PacketQueue::~PacketQueue() { | |
| 86 Clear(); | |
| 87 } | |
| 88 | |
| 89 bool DataChannel::PacketQueue::Empty() const { | |
| 90 return packets_.empty(); | |
| 91 } | |
| 92 | |
| 93 DataBuffer* DataChannel::PacketQueue::Front() { | |
| 94 return packets_.front(); | |
| 95 } | |
| 96 | |
| 97 void DataChannel::PacketQueue::Pop() { | |
| 98 if (packets_.empty()) { | |
| 99 return; | |
| 100 } | |
| 101 | |
| 102 byte_count_ -= packets_.front()->size(); | |
| 103 packets_.pop_front(); | |
| 104 } | |
| 105 | |
| 106 void DataChannel::PacketQueue::Push(DataBuffer* packet) { | |
| 107 byte_count_ += packet->size(); | |
| 108 packets_.push_back(packet); | |
| 109 } | |
| 110 | |
| 111 void DataChannel::PacketQueue::Clear() { | |
| 112 while (!packets_.empty()) { | |
| 113 delete packets_.front(); | |
| 114 packets_.pop_front(); | |
| 115 } | |
| 116 byte_count_ = 0; | |
| 117 } | |
| 118 | |
| 119 void DataChannel::PacketQueue::Swap(PacketQueue* other) { | |
| 120 size_t other_byte_count = other->byte_count_; | |
| 121 other->byte_count_ = byte_count_; | |
| 122 byte_count_ = other_byte_count; | |
| 123 | |
| 124 other->packets_.swap(packets_); | |
| 125 } | |
| 126 | |
| 127 rtc::scoped_refptr<DataChannel> DataChannel::Create( | |
| 128 DataChannelProviderInterface* provider, | |
| 129 cricket::DataChannelType dct, | |
| 130 const std::string& label, | |
| 131 const InternalDataChannelInit& config) { | |
| 132 rtc::scoped_refptr<DataChannel> channel( | |
| 133 new rtc::RefCountedObject<DataChannel>(provider, dct, label)); | |
| 134 if (!channel->Init(config)) { | |
| 135 return NULL; | |
| 136 } | |
| 137 return channel; | |
| 138 } | |
| 139 | |
| 140 DataChannel::DataChannel( | |
| 141 DataChannelProviderInterface* provider, | |
| 142 cricket::DataChannelType dct, | |
| 143 const std::string& label) | |
| 144 : label_(label), | |
| 145 observer_(NULL), | |
| 146 state_(kConnecting), | |
| 147 data_channel_type_(dct), | |
| 148 provider_(provider), | |
| 149 handshake_state_(kHandshakeInit), | |
| 150 connected_to_provider_(false), | |
| 151 send_ssrc_set_(false), | |
| 152 receive_ssrc_set_(false), | |
| 153 writable_(false), | |
| 154 send_ssrc_(0), | |
| 155 receive_ssrc_(0) { | |
| 156 } | |
| 157 | |
| 158 bool DataChannel::Init(const InternalDataChannelInit& config) { | |
| 159 if (data_channel_type_ == cricket::DCT_RTP) { | |
| 160 if (config.reliable || | |
| 161 config.id != -1 || | |
| 162 config.maxRetransmits != -1 || | |
| 163 config.maxRetransmitTime != -1) { | |
| 164 LOG(LS_ERROR) << "Failed to initialize the RTP data channel due to " | |
| 165 << "invalid DataChannelInit."; | |
| 166 return false; | |
| 167 } | |
| 168 handshake_state_ = kHandshakeReady; | |
| 169 } else if (data_channel_type_ == cricket::DCT_SCTP) { | |
| 170 if (config.id < -1 || | |
| 171 config.maxRetransmits < -1 || | |
| 172 config.maxRetransmitTime < -1) { | |
| 173 LOG(LS_ERROR) << "Failed to initialize the SCTP data channel due to " | |
| 174 << "invalid DataChannelInit."; | |
| 175 return false; | |
| 176 } | |
| 177 if (config.maxRetransmits != -1 && config.maxRetransmitTime != -1) { | |
| 178 LOG(LS_ERROR) << | |
| 179 "maxRetransmits and maxRetransmitTime should not be both set."; | |
| 180 return false; | |
| 181 } | |
| 182 config_ = config; | |
| 183 | |
| 184 switch (config_.open_handshake_role) { | |
| 185 case webrtc::InternalDataChannelInit::kNone: // pre-negotiated | |
| 186 handshake_state_ = kHandshakeReady; | |
| 187 break; | |
| 188 case webrtc::InternalDataChannelInit::kOpener: | |
| 189 handshake_state_ = kHandshakeShouldSendOpen; | |
| 190 break; | |
| 191 case webrtc::InternalDataChannelInit::kAcker: | |
| 192 handshake_state_ = kHandshakeShouldSendAck; | |
| 193 break; | |
| 194 }; | |
| 195 | |
| 196 // Try to connect to the transport in case the transport channel already | |
| 197 // exists. | |
| 198 OnTransportChannelCreated(); | |
| 199 | |
| 200 // Checks if the transport is ready to send because the initial channel | |
| 201 // ready signal may have been sent before the DataChannel creation. | |
| 202 // This has to be done async because the upper layer objects (e.g. | |
| 203 // Chrome glue and WebKit) are not wired up properly until after this | |
| 204 // function returns. | |
| 205 if (provider_->ReadyToSendData()) { | |
| 206 rtc::Thread::Current()->Post(this, MSG_CHANNELREADY, NULL); | |
| 207 } | |
| 208 } | |
| 209 | |
| 210 return true; | |
| 211 } | |
| 212 | |
| 213 DataChannel::~DataChannel() {} | |
| 214 | |
| 215 void DataChannel::RegisterObserver(DataChannelObserver* observer) { | |
| 216 observer_ = observer; | |
| 217 DeliverQueuedReceivedData(); | |
| 218 } | |
| 219 | |
| 220 void DataChannel::UnregisterObserver() { | |
| 221 observer_ = NULL; | |
| 222 } | |
| 223 | |
| 224 bool DataChannel::reliable() const { | |
| 225 if (data_channel_type_ == cricket::DCT_RTP) { | |
| 226 return false; | |
| 227 } else { | |
| 228 return config_.maxRetransmits == -1 && | |
| 229 config_.maxRetransmitTime == -1; | |
| 230 } | |
| 231 } | |
| 232 | |
| 233 uint64_t DataChannel::buffered_amount() const { | |
| 234 return queued_send_data_.byte_count(); | |
| 235 } | |
| 236 | |
| 237 void DataChannel::Close() { | |
| 238 if (state_ == kClosed) | |
| 239 return; | |
| 240 send_ssrc_ = 0; | |
| 241 send_ssrc_set_ = false; | |
| 242 SetState(kClosing); | |
| 243 UpdateState(); | |
| 244 } | |
| 245 | |
| 246 bool DataChannel::Send(const DataBuffer& buffer) { | |
| 247 if (state_ != kOpen) { | |
| 248 return false; | |
| 249 } | |
| 250 | |
| 251 // TODO(jiayl): the spec is unclear about if the remote side should get the | |
| 252 // onmessage event. We need to figure out the expected behavior and change the | |
| 253 // code accordingly. | |
| 254 if (buffer.size() == 0) { | |
| 255 return true; | |
| 256 } | |
| 257 | |
| 258 // If the queue is non-empty, we're waiting for SignalReadyToSend, | |
| 259 // so just add to the end of the queue and keep waiting. | |
| 260 if (!queued_send_data_.Empty()) { | |
| 261 // Only SCTP DataChannel queues the outgoing data when the transport is | |
| 262 // blocked. | |
| 263 ASSERT(data_channel_type_ == cricket::DCT_SCTP); | |
| 264 if (!QueueSendDataMessage(buffer)) { | |
| 265 Close(); | |
| 266 } | |
| 267 return true; | |
| 268 } | |
| 269 | |
| 270 bool success = SendDataMessage(buffer, true); | |
| 271 if (data_channel_type_ == cricket::DCT_RTP) { | |
| 272 return success; | |
| 273 } | |
| 274 | |
| 275 // Always return true for SCTP DataChannel per the spec. | |
| 276 return true; | |
| 277 } | |
| 278 | |
| 279 void DataChannel::SetReceiveSsrc(uint32_t receive_ssrc) { | |
| 280 ASSERT(data_channel_type_ == cricket::DCT_RTP); | |
| 281 | |
| 282 if (receive_ssrc_set_) { | |
| 283 return; | |
| 284 } | |
| 285 receive_ssrc_ = receive_ssrc; | |
| 286 receive_ssrc_set_ = true; | |
| 287 UpdateState(); | |
| 288 } | |
| 289 | |
| 290 // The remote peer request that this channel shall be closed. | |
| 291 void DataChannel::RemotePeerRequestClose() { | |
| 292 DoClose(); | |
| 293 } | |
| 294 | |
| 295 void DataChannel::SetSctpSid(int sid) { | |
| 296 ASSERT(config_.id < 0 && sid >= 0 && data_channel_type_ == cricket::DCT_SCTP); | |
| 297 if (config_.id == sid) { | |
| 298 return; | |
| 299 } | |
| 300 | |
| 301 config_.id = sid; | |
| 302 provider_->AddSctpDataStream(sid); | |
| 303 } | |
| 304 | |
| 305 void DataChannel::OnTransportChannelCreated() { | |
| 306 ASSERT(data_channel_type_ == cricket::DCT_SCTP); | |
| 307 if (!connected_to_provider_) { | |
| 308 connected_to_provider_ = provider_->ConnectDataChannel(this); | |
| 309 } | |
| 310 // The sid may have been unassigned when provider_->ConnectDataChannel was | |
| 311 // done. So always add the streams even if connected_to_provider_ is true. | |
| 312 if (config_.id >= 0) { | |
| 313 provider_->AddSctpDataStream(config_.id); | |
| 314 } | |
| 315 } | |
| 316 | |
| 317 // The underlying transport channel was destroyed. | |
| 318 // This function makes sure the DataChannel is disconnected and changes state to | |
| 319 // kClosed. | |
| 320 void DataChannel::OnTransportChannelDestroyed() { | |
| 321 DoClose(); | |
| 322 } | |
| 323 | |
| 324 void DataChannel::SetSendSsrc(uint32_t send_ssrc) { | |
| 325 ASSERT(data_channel_type_ == cricket::DCT_RTP); | |
| 326 if (send_ssrc_set_) { | |
| 327 return; | |
| 328 } | |
| 329 send_ssrc_ = send_ssrc; | |
| 330 send_ssrc_set_ = true; | |
| 331 UpdateState(); | |
| 332 } | |
| 333 | |
| 334 void DataChannel::OnMessage(rtc::Message* msg) { | |
| 335 switch (msg->message_id) { | |
| 336 case MSG_CHANNELREADY: | |
| 337 OnChannelReady(true); | |
| 338 break; | |
| 339 } | |
| 340 } | |
| 341 | |
| 342 void DataChannel::OnDataReceived(cricket::DataChannel* channel, | |
| 343 const cricket::ReceiveDataParams& params, | |
| 344 const rtc::Buffer& payload) { | |
| 345 uint32_t expected_ssrc = | |
| 346 (data_channel_type_ == cricket::DCT_RTP) ? receive_ssrc_ : config_.id; | |
| 347 if (params.ssrc != expected_ssrc) { | |
| 348 return; | |
| 349 } | |
| 350 | |
| 351 if (params.type == cricket::DMT_CONTROL) { | |
| 352 ASSERT(data_channel_type_ == cricket::DCT_SCTP); | |
| 353 if (handshake_state_ != kHandshakeWaitingForAck) { | |
| 354 // Ignore it if we are not expecting an ACK message. | |
| 355 LOG(LS_WARNING) << "DataChannel received unexpected CONTROL message, " | |
| 356 << "sid = " << params.ssrc; | |
| 357 return; | |
| 358 } | |
| 359 if (ParseDataChannelOpenAckMessage(payload)) { | |
| 360 // We can send unordered as soon as we receive the ACK message. | |
| 361 handshake_state_ = kHandshakeReady; | |
| 362 LOG(LS_INFO) << "DataChannel received OPEN_ACK message, sid = " | |
| 363 << params.ssrc; | |
| 364 } else { | |
| 365 LOG(LS_WARNING) << "DataChannel failed to parse OPEN_ACK message, sid = " | |
| 366 << params.ssrc; | |
| 367 } | |
| 368 return; | |
| 369 } | |
| 370 | |
| 371 ASSERT(params.type == cricket::DMT_BINARY || | |
| 372 params.type == cricket::DMT_TEXT); | |
| 373 | |
| 374 LOG(LS_VERBOSE) << "DataChannel received DATA message, sid = " << params.ssrc; | |
| 375 // We can send unordered as soon as we receive any DATA message since the | |
| 376 // remote side must have received the OPEN (and old clients do not send | |
| 377 // OPEN_ACK). | |
| 378 if (handshake_state_ == kHandshakeWaitingForAck) { | |
| 379 handshake_state_ = kHandshakeReady; | |
| 380 } | |
| 381 | |
| 382 bool binary = (params.type == cricket::DMT_BINARY); | |
| 383 rtc::scoped_ptr<DataBuffer> buffer(new DataBuffer(payload, binary)); | |
| 384 if (state_ == kOpen && observer_) { | |
| 385 observer_->OnMessage(*buffer.get()); | |
| 386 } else { | |
| 387 if (queued_received_data_.byte_count() + payload.size() > | |
| 388 kMaxQueuedReceivedDataBytes) { | |
| 389 LOG(LS_ERROR) << "Queued received data exceeds the max buffer size."; | |
| 390 | |
| 391 queued_received_data_.Clear(); | |
| 392 if (data_channel_type_ != cricket::DCT_RTP) { | |
| 393 Close(); | |
| 394 } | |
| 395 | |
| 396 return; | |
| 397 } | |
| 398 queued_received_data_.Push(buffer.release()); | |
| 399 } | |
| 400 } | |
| 401 | |
| 402 void DataChannel::OnStreamClosedRemotely(uint32_t sid) { | |
| 403 if (data_channel_type_ == cricket::DCT_SCTP && sid == config_.id) { | |
| 404 Close(); | |
| 405 } | |
| 406 } | |
| 407 | |
| 408 void DataChannel::OnChannelReady(bool writable) { | |
| 409 writable_ = writable; | |
| 410 if (!writable) { | |
| 411 return; | |
| 412 } | |
| 413 | |
| 414 SendQueuedControlMessages(); | |
| 415 SendQueuedDataMessages(); | |
| 416 UpdateState(); | |
| 417 } | |
| 418 | |
| 419 void DataChannel::DoClose() { | |
| 420 if (state_ == kClosed) | |
| 421 return; | |
| 422 | |
| 423 receive_ssrc_set_ = false; | |
| 424 send_ssrc_set_ = false; | |
| 425 SetState(kClosing); | |
| 426 UpdateState(); | |
| 427 } | |
| 428 | |
| 429 void DataChannel::UpdateState() { | |
| 430 // UpdateState determines what to do from a few state variables. Include | |
| 431 // all conditions required for each state transition here for | |
| 432 // clarity. OnChannelReady(true) will send any queued data and then invoke | |
| 433 // UpdateState(). | |
| 434 switch (state_) { | |
| 435 case kConnecting: { | |
| 436 if (send_ssrc_set_ == receive_ssrc_set_) { | |
| 437 if (data_channel_type_ == cricket::DCT_RTP && !connected_to_provider_) { | |
| 438 connected_to_provider_ = provider_->ConnectDataChannel(this); | |
| 439 } | |
| 440 if (connected_to_provider_) { | |
| 441 if (handshake_state_ == kHandshakeShouldSendOpen) { | |
| 442 rtc::Buffer payload; | |
| 443 WriteDataChannelOpenMessage(label_, config_, &payload); | |
| 444 SendControlMessage(payload); | |
| 445 } else if (handshake_state_ == kHandshakeShouldSendAck) { | |
| 446 rtc::Buffer payload; | |
| 447 WriteDataChannelOpenAckMessage(&payload); | |
| 448 SendControlMessage(payload); | |
| 449 } | |
| 450 if (writable_ && | |
| 451 (handshake_state_ == kHandshakeReady || | |
| 452 handshake_state_ == kHandshakeWaitingForAck)) { | |
| 453 SetState(kOpen); | |
| 454 // If we have received buffers before the channel got writable. | |
| 455 // Deliver them now. | |
| 456 DeliverQueuedReceivedData(); | |
| 457 } | |
| 458 } | |
| 459 } | |
| 460 break; | |
| 461 } | |
| 462 case kOpen: { | |
| 463 break; | |
| 464 } | |
| 465 case kClosing: { | |
| 466 if (queued_send_data_.Empty() && queued_control_data_.Empty()) { | |
| 467 if (connected_to_provider_) { | |
| 468 DisconnectFromProvider(); | |
| 469 } | |
| 470 | |
| 471 if (!connected_to_provider_ && !send_ssrc_set_ && !receive_ssrc_set_) { | |
| 472 SetState(kClosed); | |
| 473 } | |
| 474 } | |
| 475 break; | |
| 476 } | |
| 477 case kClosed: | |
| 478 break; | |
| 479 } | |
| 480 } | |
| 481 | |
| 482 void DataChannel::SetState(DataState state) { | |
| 483 if (state_ == state) { | |
| 484 return; | |
| 485 } | |
| 486 | |
| 487 state_ = state; | |
| 488 if (observer_) { | |
| 489 observer_->OnStateChange(); | |
| 490 } | |
| 491 if (state_ == kClosed) { | |
| 492 SignalClosed(this); | |
| 493 } | |
| 494 } | |
| 495 | |
| 496 void DataChannel::DisconnectFromProvider() { | |
| 497 if (!connected_to_provider_) | |
| 498 return; | |
| 499 | |
| 500 provider_->DisconnectDataChannel(this); | |
| 501 connected_to_provider_ = false; | |
| 502 | |
| 503 if (data_channel_type_ == cricket::DCT_SCTP && config_.id >= 0) { | |
| 504 provider_->RemoveSctpDataStream(config_.id); | |
| 505 } | |
| 506 } | |
| 507 | |
| 508 void DataChannel::DeliverQueuedReceivedData() { | |
| 509 if (!observer_) { | |
| 510 return; | |
| 511 } | |
| 512 | |
| 513 while (!queued_received_data_.Empty()) { | |
| 514 rtc::scoped_ptr<DataBuffer> buffer(queued_received_data_.Front()); | |
| 515 observer_->OnMessage(*buffer); | |
| 516 queued_received_data_.Pop(); | |
| 517 } | |
| 518 } | |
| 519 | |
| 520 void DataChannel::SendQueuedDataMessages() { | |
| 521 if (queued_send_data_.Empty()) { | |
| 522 return; | |
| 523 } | |
| 524 | |
| 525 ASSERT(state_ == kOpen || state_ == kClosing); | |
| 526 | |
| 527 uint64_t start_buffered_amount = buffered_amount(); | |
| 528 while (!queued_send_data_.Empty()) { | |
| 529 DataBuffer* buffer = queued_send_data_.Front(); | |
| 530 if (!SendDataMessage(*buffer, false)) { | |
| 531 // Leave the message in the queue if sending is aborted. | |
| 532 break; | |
| 533 } | |
| 534 queued_send_data_.Pop(); | |
| 535 delete buffer; | |
| 536 } | |
| 537 | |
| 538 if (observer_ && buffered_amount() < start_buffered_amount) { | |
| 539 observer_->OnBufferedAmountChange(start_buffered_amount); | |
| 540 } | |
| 541 } | |
| 542 | |
| 543 bool DataChannel::SendDataMessage(const DataBuffer& buffer, | |
| 544 bool queue_if_blocked) { | |
| 545 cricket::SendDataParams send_params; | |
| 546 | |
| 547 if (data_channel_type_ == cricket::DCT_SCTP) { | |
| 548 send_params.ordered = config_.ordered; | |
| 549 // Send as ordered if it is still going through OPEN/ACK signaling. | |
| 550 if (handshake_state_ != kHandshakeReady && !config_.ordered) { | |
| 551 send_params.ordered = true; | |
| 552 LOG(LS_VERBOSE) << "Sending data as ordered for unordered DataChannel " | |
| 553 << "because the OPEN_ACK message has not been received."; | |
| 554 } | |
| 555 | |
| 556 send_params.max_rtx_count = config_.maxRetransmits; | |
| 557 send_params.max_rtx_ms = config_.maxRetransmitTime; | |
| 558 send_params.ssrc = config_.id; | |
| 559 } else { | |
| 560 send_params.ssrc = send_ssrc_; | |
| 561 } | |
| 562 send_params.type = buffer.binary ? cricket::DMT_BINARY : cricket::DMT_TEXT; | |
| 563 | |
| 564 cricket::SendDataResult send_result = cricket::SDR_SUCCESS; | |
| 565 bool success = provider_->SendData(send_params, buffer.data, &send_result); | |
| 566 | |
| 567 if (success) { | |
| 568 return true; | |
| 569 } | |
| 570 | |
| 571 if (data_channel_type_ != cricket::DCT_SCTP) { | |
| 572 return false; | |
| 573 } | |
| 574 | |
| 575 if (send_result == cricket::SDR_BLOCK) { | |
| 576 if (!queue_if_blocked || QueueSendDataMessage(buffer)) { | |
| 577 return false; | |
| 578 } | |
| 579 } | |
| 580 // Close the channel if the error is not SDR_BLOCK, or if queuing the | |
| 581 // message failed. | |
| 582 LOG(LS_ERROR) << "Closing the DataChannel due to a failure to send data, " | |
| 583 << "send_result = " << send_result; | |
| 584 Close(); | |
| 585 | |
| 586 return false; | |
| 587 } | |
| 588 | |
| 589 bool DataChannel::QueueSendDataMessage(const DataBuffer& buffer) { | |
| 590 size_t start_buffered_amount = buffered_amount(); | |
| 591 if (start_buffered_amount >= kMaxQueuedSendDataBytes) { | |
| 592 LOG(LS_ERROR) << "Can't buffer any more data for the data channel."; | |
| 593 return false; | |
| 594 } | |
| 595 queued_send_data_.Push(new DataBuffer(buffer)); | |
| 596 | |
| 597 // The buffer can have length zero, in which case there is no change. | |
| 598 if (observer_ && buffered_amount() > start_buffered_amount) { | |
| 599 observer_->OnBufferedAmountChange(start_buffered_amount); | |
| 600 } | |
| 601 return true; | |
| 602 } | |
| 603 | |
| 604 void DataChannel::SendQueuedControlMessages() { | |
| 605 PacketQueue control_packets; | |
| 606 control_packets.Swap(&queued_control_data_); | |
| 607 | |
| 608 while (!control_packets.Empty()) { | |
| 609 rtc::scoped_ptr<DataBuffer> buf(control_packets.Front()); | |
| 610 SendControlMessage(buf->data); | |
| 611 control_packets.Pop(); | |
| 612 } | |
| 613 } | |
| 614 | |
| 615 void DataChannel::QueueControlMessage(const rtc::Buffer& buffer) { | |
| 616 queued_control_data_.Push(new DataBuffer(buffer, true)); | |
| 617 } | |
| 618 | |
| 619 bool DataChannel::SendControlMessage(const rtc::Buffer& buffer) { | |
| 620 bool is_open_message = handshake_state_ == kHandshakeShouldSendOpen; | |
| 621 | |
| 622 ASSERT(data_channel_type_ == cricket::DCT_SCTP && | |
| 623 writable_ && | |
| 624 config_.id >= 0 && | |
| 625 (!is_open_message || !config_.negotiated)); | |
| 626 | |
| 627 cricket::SendDataParams send_params; | |
| 628 send_params.ssrc = config_.id; | |
| 629 // Send data as ordered before we receive any message from the remote peer to | |
| 630 // make sure the remote peer will not receive any data before it receives the | |
| 631 // OPEN message. | |
| 632 send_params.ordered = config_.ordered || is_open_message; | |
| 633 send_params.type = cricket::DMT_CONTROL; | |
| 634 | |
| 635 cricket::SendDataResult send_result = cricket::SDR_SUCCESS; | |
| 636 bool retval = provider_->SendData(send_params, buffer, &send_result); | |
| 637 if (retval) { | |
| 638 LOG(LS_INFO) << "Sent CONTROL message on channel " << config_.id; | |
| 639 | |
| 640 if (handshake_state_ == kHandshakeShouldSendAck) { | |
| 641 handshake_state_ = kHandshakeReady; | |
| 642 } else if (handshake_state_ == kHandshakeShouldSendOpen) { | |
| 643 handshake_state_ = kHandshakeWaitingForAck; | |
| 644 } | |
| 645 } else if (send_result == cricket::SDR_BLOCK) { | |
| 646 QueueControlMessage(buffer); | |
| 647 } else { | |
| 648 LOG(LS_ERROR) << "Closing the DataChannel due to a failure to send" | |
| 649 << " the CONTROL message, send_result = " << send_result; | |
| 650 Close(); | |
| 651 } | |
| 652 return retval; | |
| 653 } | |
| 654 | |
| 655 } // namespace webrtc | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1610243002:
Move talk/app/webrtc to webrtc/api (Closed)
Base URL: https://chromium.googlesource.com/external/webrtc.git@master