extensions/browser/api/cast_channel/cast_transport.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "extensions/browser/api/cast_channel/cast_transport.h"
   6
   7 #include <string>
   8
   9 #include "base/bind.h"
  10 #include "base/format_macros.h"
  11 #include "base/numerics/safe_conversions.h"
  12 #include "base/strings/stringprintf.h"
  13 #include "extensions/browser/api/cast_channel/cast_framer.h"
  14 #include "extensions/browser/api/cast_channel/cast_message_util.h"
  15 #include "extensions/browser/api/cast_channel/logger.h"
  16 #include "extensions/browser/api/cast_channel/logger_util.h"
  17 #include "extensions/common/api/cast_channel/cast_channel.pb.h"
  18 #include "net/base/net_errors.h"
  19 #include "net/socket/socket.h"
  20
  21 #define VLOG_WITH_CONNECTION(level)                                           \
  22   VLOG(level) << "[" << ip_endpoint_.ToString() << ", auth=" << channel_auth_ \
  23               << "] "
  24
  25 namespace extensions {
  26 namespace core_api {
  27 namespace cast_channel {
  28
  29 CastTransportImpl::CastTransportImpl(net::Socket* socket,
  30                                      int channel_id,
  31                                      const net::IPEndPoint& ip_endpoint,
  32                                      ChannelAuthType channel_auth,
  33                                      scoped_refptr<Logger> logger)
  34     : started_(false),
  35       socket_(socket),
  36       write_state_(WRITE_STATE_NONE),
  37       read_state_(READ_STATE_NONE),
  38       error_state_(CHANNEL_ERROR_NONE),
  39       channel_id_(channel_id),
  40       ip_endpoint_(ip_endpoint),
  41       channel_auth_(channel_auth),
  42       logger_(logger) {
  43   DCHECK(socket);
  44
  45   // Buffer is reused across messages to minimize unnecessary buffer
  46   // [re]allocations.
  47   read_buffer_ = new net::GrowableIOBuffer();
  48   read_buffer_->SetCapacity(MessageFramer::MessageHeader::max_message_size());
  49   framer_.reset(new MessageFramer(read_buffer_));
  50 }
  51
  52 CastTransportImpl::~CastTransportImpl() {
  53   DCHECK(CalledOnValidThread());
  54   FlushWriteQueue();
  55 }
  56
  57 // static
  58 proto::ReadState CastTransportImpl::ReadStateToProto(
  59     CastTransportImpl::ReadState state) {
  60   switch (state) {
  61     case CastTransportImpl::READ_STATE_NONE:
  62       return proto::READ_STATE_NONE;
  63     case CastTransportImpl::READ_STATE_READ:
  64       return proto::READ_STATE_READ;
  65     case CastTransportImpl::READ_STATE_READ_COMPLETE:
  66       return proto::READ_STATE_READ_COMPLETE;
  67     case CastTransportImpl::READ_STATE_DO_CALLBACK:
  68       return proto::READ_STATE_DO_CALLBACK;
  69     case CastTransportImpl::READ_STATE_ERROR:
  70       return proto::READ_STATE_ERROR;
  71     default:
  72       NOTREACHED();
  73       return proto::READ_STATE_NONE;
  74   }
  75 }
  76
  77 // static
  78 proto::WriteState CastTransportImpl::WriteStateToProto(
  79     CastTransportImpl::WriteState state) {
  80   switch (state) {
  81     case CastTransportImpl::WRITE_STATE_NONE:
  82       return proto::WRITE_STATE_NONE;
  83     case CastTransportImpl::WRITE_STATE_WRITE:
  84       return proto::WRITE_STATE_WRITE;
  85     case CastTransportImpl::WRITE_STATE_WRITE_COMPLETE:
  86       return proto::WRITE_STATE_WRITE_COMPLETE;
  87     case CastTransportImpl::WRITE_STATE_DO_CALLBACK:
  88       return proto::WRITE_STATE_DO_CALLBACK;
  89     case CastTransportImpl::WRITE_STATE_ERROR:
  90       return proto::WRITE_STATE_ERROR;
  91     default:
  92       NOTREACHED();
  93       return proto::WRITE_STATE_NONE;
  94   }
  95 }
  96
  97 // static
  98 proto::ErrorState CastTransportImpl::ErrorStateToProto(ChannelError state) {
  99   switch (state) {
 100     case CHANNEL_ERROR_NONE:
 101       return proto::CHANNEL_ERROR_NONE;
 102     case CHANNEL_ERROR_CHANNEL_NOT_OPEN:
 103       return proto::CHANNEL_ERROR_CHANNEL_NOT_OPEN;
 104     case CHANNEL_ERROR_AUTHENTICATION_ERROR:
 105       return proto::CHANNEL_ERROR_AUTHENTICATION_ERROR;
 106     case CHANNEL_ERROR_CONNECT_ERROR:
 107       return proto::CHANNEL_ERROR_CONNECT_ERROR;
 108     case CHANNEL_ERROR_SOCKET_ERROR:
 109       return proto::CHANNEL_ERROR_SOCKET_ERROR;
 110     case CHANNEL_ERROR_TRANSPORT_ERROR:
 111       return proto::CHANNEL_ERROR_TRANSPORT_ERROR;
 112     case CHANNEL_ERROR_INVALID_MESSAGE:
 113       return proto::CHANNEL_ERROR_INVALID_MESSAGE;
 114     case CHANNEL_ERROR_INVALID_CHANNEL_ID:
 115       return proto::CHANNEL_ERROR_INVALID_CHANNEL_ID;
 116     case CHANNEL_ERROR_CONNECT_TIMEOUT:
 117       return proto::CHANNEL_ERROR_CONNECT_TIMEOUT;
 118     case CHANNEL_ERROR_UNKNOWN:
 119       return proto::CHANNEL_ERROR_UNKNOWN;
 120     default:
 121       NOTREACHED();
 122       return proto::CHANNEL_ERROR_NONE;
 123   }
 124 }
 125
 126 void CastTransportImpl::SetReadDelegate(scoped_ptr<Delegate> delegate) {
 127   DCHECK(CalledOnValidThread());
 128   DCHECK(delegate);
 129   delegate_ = delegate.Pass();
 130   if (started_) {
 131     delegate_->Start();
 132   }
 133 }
 134
 135 void CastTransportImpl::FlushWriteQueue() {
 136   for (; !write_queue_.empty(); write_queue_.pop()) {
 137     net::CompletionCallback& callback = write_queue_.front().callback;
 138     callback.Run(net::ERR_FAILED);
 139     callback.Reset();
 140   }
 141 }
 142
 143 void CastTransportImpl::SendMessage(const CastMessage& message,
 144                                     const net::CompletionCallback& callback) {
 145   DCHECK(CalledOnValidThread());
 146   std::string serialized_message;
 147   if (!MessageFramer::Serialize(message, &serialized_message)) {
 148     logger_->LogSocketEventForMessage(channel_id_, proto::SEND_MESSAGE_FAILED,
 149                                       message.namespace_(),
 150                                       "Error when serializing message.");
 151     callback.Run(net::ERR_FAILED);
 152     return;
 153   }
 154   WriteRequest write_request(
 155       message.namespace_(), serialized_message, callback);
 156
 157   write_queue_.push(write_request);
 158   logger_->LogSocketEventForMessage(
 159       channel_id_, proto::MESSAGE_ENQUEUED, message.namespace_(),
 160       base::StringPrintf("Queue size: %" PRIuS, write_queue_.size()));
 161   if (write_state_ == WRITE_STATE_NONE) {
 162     SetWriteState(WRITE_STATE_WRITE);
 163     OnWriteResult(net::OK);
 164   }
 165 }
 166
 167 CastTransportImpl::WriteRequest::WriteRequest(
 168     const std::string& namespace_,
 169     const std::string& payload,
 170     const net::CompletionCallback& callback)
 171     : message_namespace(namespace_), callback(callback) {
 172   VLOG(2) << "WriteRequest size: " << payload.size();
 173   io_buffer = new net::DrainableIOBuffer(new net::StringIOBuffer(payload),
 174                                          payload.size());
 175 }
 176
 177 CastTransportImpl::WriteRequest::~WriteRequest() {
 178 }
 179
 180 void CastTransportImpl::SetReadState(ReadState read_state) {
 181   if (read_state_ != read_state) {
 182     read_state_ = read_state;
 183     logger_->LogSocketReadState(channel_id_, ReadStateToProto(read_state_));
 184   }
 185 }
 186
 187 void CastTransportImpl::SetWriteState(WriteState write_state) {
 188   if (write_state_ != write_state) {
 189     write_state_ = write_state;
 190     logger_->LogSocketWriteState(channel_id_, WriteStateToProto(write_state_));
 191   }
 192 }
 193
 194 void CastTransportImpl::SetErrorState(ChannelError error_state) {
 195   VLOG_WITH_CONNECTION(2) << "SetErrorState: " << error_state;
 196   error_state_ = error_state;
 197 }
 198
 199 void CastTransportImpl::OnWriteResult(int result) {
 200   DCHECK(CalledOnValidThread());
 201   if (write_queue_.empty()) {
 202     SetWriteState(WRITE_STATE_NONE);
 203     return;
 204   }
 205
 206   // Network operations can either finish synchronously or asynchronously.
 207   // This method executes the state machine transitions in a loop so that
 208   // write state transitions happen even when network operations finish
 209   // synchronously.
 210   int rv = result;
 211   do {
 212     VLOG_WITH_CONNECTION(2) << "OnWriteResult (state=" << write_state_ << ", "
 213                             << "result=" << rv << ", "
 214                             << "queue size=" << write_queue_.size() << ")";
 215
 216     WriteState state = write_state_;
 217     write_state_ = WRITE_STATE_NONE;
 218     switch (state) {
 219       case WRITE_STATE_WRITE:
 220         rv = DoWrite();
 221         break;
 222       case WRITE_STATE_WRITE_COMPLETE:
 223         rv = DoWriteComplete(rv);
 224         break;
 225       case WRITE_STATE_DO_CALLBACK:
 226         rv = DoWriteCallback();
 227         break;
 228       case WRITE_STATE_ERROR:
 229         rv = DoWriteError(rv);
 230         break;
 231       default:
 232         NOTREACHED() << "BUG in write flow. Unknown state: " << state;
 233         break;
 234     }
 235   } while (!write_queue_.empty() && rv != net::ERR_IO_PENDING &&
 236            write_state_ != WRITE_STATE_NONE);
 237
 238   // No state change occurred in the switch case above. This means the
 239   // write operation has completed.
 240   if (write_state_ == WRITE_STATE_NONE) {
 241     logger_->LogSocketWriteState(channel_id_, WriteStateToProto(write_state_));
 242   }
 243
 244   if (rv == net::ERR_FAILED) {
 245     VLOG_WITH_CONNECTION(2) << "Sending OnError().";
 246     DCHECK_NE(CHANNEL_ERROR_NONE, error_state_);
 247     delegate_->OnError(error_state_);
 248   }
 249
 250   // If write loop is done because the queue is empty then set write
 251   // state to NONE
 252   if (write_queue_.empty()) {
 253     SetWriteState(WRITE_STATE_NONE);
 254   }
 255
 256   // Write loop is done - flush the remaining write operations if an error
 257   // was encountered.
 258   if (rv == net::ERR_FAILED) {
 259     DCHECK_NE(CHANNEL_ERROR_NONE, error_state_);
 260     FlushWriteQueue();
 261   }
 262 }
 263
 264 int CastTransportImpl::DoWrite() {
 265   DCHECK(!write_queue_.empty());
 266   WriteRequest& request = write_queue_.front();
 267
 268   VLOG_WITH_CONNECTION(2) << "WriteData byte_count = "
 269                           << request.io_buffer->size() << " bytes_written "
 270                           << request.io_buffer->BytesConsumed();
 271
 272   SetWriteState(WRITE_STATE_WRITE_COMPLETE);
 273
 274   int rv = socket_->Write(
 275       request.io_buffer.get(), request.io_buffer->BytesRemaining(),
 276       base::Bind(&CastTransportImpl::OnWriteResult, base::Unretained(this)));
 277   return rv;
 278 }
 279
 280 int CastTransportImpl::DoWriteComplete(int result) {
 281   VLOG_WITH_CONNECTION(2) << "DoWriteComplete result=" << result;
 282   DCHECK(!write_queue_.empty());
 283   logger_->LogSocketEventWithRv(channel_id_, proto::SOCKET_WRITE, result);
 284   if (result <= 0) {  // NOTE that 0 also indicates an error
 285     SetErrorState(CHANNEL_ERROR_SOCKET_ERROR);
 286     SetWriteState(WRITE_STATE_ERROR);
 287     return result == 0 ? net::ERR_FAILED : result;
 288   }
 289
 290   // Some bytes were successfully written
 291   WriteRequest& request = write_queue_.front();
 292   scoped_refptr<net::DrainableIOBuffer> io_buffer = request.io_buffer;
 293   io_buffer->DidConsume(result);
 294   if (io_buffer->BytesRemaining() == 0) {  // Message fully sent
 295     SetWriteState(WRITE_STATE_DO_CALLBACK);
 296   } else {
 297     SetWriteState(WRITE_STATE_WRITE);
 298   }
 299
 300   return net::OK;
 301 }
 302
 303 int CastTransportImpl::DoWriteCallback() {
 304   VLOG_WITH_CONNECTION(2) << "DoWriteCallback";
 305   DCHECK(!write_queue_.empty());
 306
 307   SetWriteState(WRITE_STATE_WRITE);
 308
 309   WriteRequest& request = write_queue_.front();
 310   int bytes_consumed = request.io_buffer->BytesConsumed();
 311   logger_->LogSocketEventForMessage(
 312       channel_id_, proto::MESSAGE_WRITTEN, request.message_namespace,
 313       base::StringPrintf("Bytes: %d", bytes_consumed));
 314   request.callback.Run(net::OK);
 315   write_queue_.pop();
 316   return net::OK;
 317 }
 318
 319 int CastTransportImpl::DoWriteError(int result) {
 320   VLOG_WITH_CONNECTION(2) << "DoWriteError result=" << result;
 321   DCHECK_NE(CHANNEL_ERROR_NONE, error_state_);
 322   DCHECK_LT(result, 0);
 323   return net::ERR_FAILED;
 324 }
 325
 326 void CastTransportImpl::Start() {
 327   DCHECK(CalledOnValidThread());
 328   DCHECK(!started_);
 329   DCHECK(delegate_) << "Read delegate must be set prior to calling Start()";
 330   delegate_->Start();
 331   if (read_state_ == READ_STATE_NONE) {
 332     // Initialize and run the read state machine.
 333     SetReadState(READ_STATE_READ);
 334     OnReadResult(net::OK);
 335   }
 336   started_ = true;
 337 }
 338
 339 void CastTransportImpl::OnReadResult(int result) {
 340   DCHECK(CalledOnValidThread());
 341   // Network operations can either finish synchronously or asynchronously.
 342   // This method executes the state machine transitions in a loop so that
 343   // write state transitions happen even when network operations finish
 344   // synchronously.
 345   int rv = result;
 346   do {
 347     VLOG_WITH_CONNECTION(2) << "OnReadResult(state=" << read_state_
 348                             << ", result=" << rv << ")";
 349     ReadState state = read_state_;
 350     read_state_ = READ_STATE_NONE;
 351
 352     switch (state) {
 353       case READ_STATE_READ:
 354         rv = DoRead();
 355         break;
 356       case READ_STATE_READ_COMPLETE:
 357         rv = DoReadComplete(rv);
 358         break;
 359       case READ_STATE_DO_CALLBACK:
 360         rv = DoReadCallback();
 361         break;
 362       case READ_STATE_ERROR:
 363         rv = DoReadError(rv);
 364         DCHECK_EQ(read_state_, READ_STATE_NONE);
 365         break;
 366       default:
 367         NOTREACHED() << "BUG in read flow. Unknown state: " << state;
 368         break;
 369     }
 370   } while (rv != net::ERR_IO_PENDING && read_state_ != READ_STATE_NONE);
 371
 372   // No state change occurred in do-while loop above. This means state has
 373   // transitioned to NONE.
 374   if (read_state_ == READ_STATE_NONE) {
 375     logger_->LogSocketReadState(channel_id_, ReadStateToProto(read_state_));
 376   }
 377
 378   if (rv == net::ERR_FAILED) {
 379     DCHECK_NE(CHANNEL_ERROR_NONE, error_state_);
 380     VLOG_WITH_CONNECTION(2) << "Sending OnError().";
 381     delegate_->OnError(error_state_);
 382   }
 383 }
 384
 385 int CastTransportImpl::DoRead() {
 386   VLOG_WITH_CONNECTION(2) << "DoRead";
 387   SetReadState(READ_STATE_READ_COMPLETE);
 388
 389   // Determine how many bytes need to be read.
 390   size_t num_bytes_to_read = framer_->BytesRequested();
 391   DCHECK_GT(num_bytes_to_read, 0u);
 392
 393   // Read up to num_bytes_to_read into |current_read_buffer_|.
 394   return socket_->Read(
 395       read_buffer_.get(), base::checked_cast<uint32>(num_bytes_to_read),
 396       base::Bind(&CastTransportImpl::OnReadResult, base::Unretained(this)));
 397 }
 398
 399 int CastTransportImpl::DoReadComplete(int result) {
 400   VLOG_WITH_CONNECTION(2) << "DoReadComplete result = " << result;
 401   logger_->LogSocketEventWithRv(channel_id_, proto::SOCKET_READ, result);
 402   if (result <= 0) {
 403     VLOG_WITH_CONNECTION(1) << "Read error, peer closed the socket.";
 404     SetErrorState(CHANNEL_ERROR_SOCKET_ERROR);
 405     SetReadState(READ_STATE_ERROR);
 406     return result == 0 ? net::ERR_FAILED : result;
 407   }
 408
 409   size_t message_size;
 410   DCHECK(!current_message_);
 411   ChannelError framing_error;
 412   current_message_ = framer_->Ingest(result, &message_size, &framing_error);
 413   if (current_message_.get() && (framing_error == CHANNEL_ERROR_NONE)) {
 414     DCHECK_GT(message_size, static_cast<size_t>(0));
 415     logger_->LogSocketEventForMessage(
 416         channel_id_, proto::MESSAGE_READ, current_message_->namespace_(),
 417         base::StringPrintf("Message size: %u",
 418                            static_cast<uint32>(message_size)));
 419     SetReadState(READ_STATE_DO_CALLBACK);
 420   } else if (framing_error != CHANNEL_ERROR_NONE) {
 421     DCHECK(!current_message_);
 422     SetErrorState(CHANNEL_ERROR_INVALID_MESSAGE);
 423     SetReadState(READ_STATE_ERROR);
 424   } else {
 425     DCHECK(!current_message_);
 426     SetReadState(READ_STATE_READ);
 427   }
 428   return net::OK;
 429 }
 430
 431 int CastTransportImpl::DoReadCallback() {
 432   VLOG_WITH_CONNECTION(2) << "DoReadCallback";
 433   if (!IsCastMessageValid(*current_message_)) {
 434     SetReadState(READ_STATE_ERROR);
 435     SetErrorState(CHANNEL_ERROR_INVALID_MESSAGE);
 436     return net::ERR_INVALID_RESPONSE;
 437   }
 438   SetReadState(READ_STATE_READ);
 439   delegate_->OnMessage(*current_message_);
 440   current_message_.reset();
 441   return net::OK;
 442 }
 443
 444 int CastTransportImpl::DoReadError(int result) {
 445   VLOG_WITH_CONNECTION(2) << "DoReadError";
 446   DCHECK_NE(CHANNEL_ERROR_NONE, error_state_);
 447   DCHECK_LE(result, 0);
 448   return net::ERR_FAILED;
 449 }
 450
 451 }  // namespace cast_channel
 452 }  // namespace core_api
 453 }  // namespace extensions