| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "remoting/protocol/message_reader.h" |
| |
| #include "base/bind.h" |
| #include "base/callback.h" |
| #include "base/compiler_specific.h" |
| #include "base/location.h" |
| #include "base/thread_task_runner_handle.h" |
| #include "base/single_thread_task_runner.h" |
| #include "net/base/io_buffer.h" |
| #include "net/base/net_errors.h" |
| #include "net/socket/socket.h" |
| #include "remoting/base/compound_buffer.h" |
| #include "remoting/proto/internal.pb.h" |
| |
| namespace remoting { |
| namespace protocol { |
| |
| static const int kReadBufferSize = 4096; |
| |
| MessageReader::MessageReader() |
| : socket_(NULL), |
| read_pending_(false), |
| pending_messages_(0), |
| closed_(false), |
| weak_factory_(this) { |
| } |
| |
| void MessageReader::Init(net::Socket* socket, |
| const MessageReceivedCallback& callback) { |
| DCHECK(CalledOnValidThread()); |
| message_received_callback_ = callback; |
| DCHECK(socket); |
| socket_ = socket; |
| DoRead(); |
| } |
| |
| MessageReader::~MessageReader() { |
| } |
| |
| void MessageReader::DoRead() { |
| DCHECK(CalledOnValidThread()); |
| // Don't try to read again if there is another read pending or we |
| // have messages that we haven't finished processing yet. |
| while (!closed_ && !read_pending_ && pending_messages_ == 0) { |
| read_buffer_ = new net::IOBuffer(kReadBufferSize); |
| int result = socket_->Read( |
| read_buffer_.get(), |
| kReadBufferSize, |
| base::Bind(&MessageReader::OnRead, weak_factory_.GetWeakPtr())); |
| HandleReadResult(result); |
| } |
| } |
| |
| void MessageReader::OnRead(int result) { |
| DCHECK(CalledOnValidThread()); |
| DCHECK(read_pending_); |
| read_pending_ = false; |
| |
| if (!closed_) { |
| HandleReadResult(result); |
| DoRead(); |
| } |
| } |
| |
| void MessageReader::HandleReadResult(int result) { |
| DCHECK(CalledOnValidThread()); |
| if (closed_) |
| return; |
| |
| if (result > 0) { |
| OnDataReceived(read_buffer_.get(), result); |
| } else if (result == net::ERR_IO_PENDING) { |
| read_pending_ = true; |
| } else { |
| if (result != net::ERR_CONNECTION_CLOSED) { |
| LOG(ERROR) << "Read() returned error " << result; |
| } |
| // Stop reading after any error. |
| closed_ = true; |
| } |
| } |
| |
| void MessageReader::OnDataReceived(net::IOBuffer* data, int data_size) { |
| DCHECK(CalledOnValidThread()); |
| message_decoder_.AddData(data, data_size); |
| |
| // Get list of all new messages first, and then call the callback |
| // for all of them. |
| while (true) { |
| CompoundBuffer* buffer = message_decoder_.GetNextMessage(); |
| if (!buffer) |
| break; |
| pending_messages_++; |
| base::ThreadTaskRunnerHandle::Get()->PostTask( |
| FROM_HERE, |
| base::Bind(&MessageReader::RunCallback, |
| weak_factory_.GetWeakPtr(), |
| base::Passed(scoped_ptr<CompoundBuffer>(buffer)))); |
| } |
| } |
| |
| void MessageReader::RunCallback(scoped_ptr<CompoundBuffer> message) { |
| message_received_callback_.Run( |
| message.Pass(), base::Bind(&MessageReader::OnMessageDone, |
| weak_factory_.GetWeakPtr())); |
| } |
| |
| void MessageReader::OnMessageDone() { |
| DCHECK(CalledOnValidThread()); |
| pending_messages_--; |
| DCHECK_GE(pending_messages_, 0); |
| |
| // Start next read if necessary. |
| DoRead(); |
| } |
| |
| } // namespace protocol |
| } // namespace remoting |