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// Copyright (c) 2010 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/message_loop.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),
message_loop_(NULL),
read_pending_(false),
pending_messages_(0),
closed_(false),
ALLOW_THIS_IN_INITIALIZER_LIST(
read_callback_(this, &MessageReader::OnRead)) {
}
MessageReader::~MessageReader() {
CHECK_EQ(pending_messages_, 0);
}
void MessageReader::Init(net::Socket* socket,
MessageReceivedCallback* callback) {
message_received_callback_.reset(callback);
DCHECK(socket);
socket_ = socket;
message_loop_ = MessageLoop::current();
DoRead();
}
void MessageReader::DoRead() {
// 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_, kReadBufferSize, &read_callback_);
HandleReadResult(result);
}
}
void MessageReader::OnRead(int result) {
DCHECK(read_pending_);
read_pending_ = false;
if (!closed_) {
HandleReadResult(result);
DoRead();
}
}
void MessageReader::HandleReadResult(int result) {
if (closed_)
return;
if (result > 0) {
OnDataReceived(read_buffer_, result);
} else {
if (result == net::ERR_CONNECTION_CLOSED) {
closed_ = true;
} else if (result == net::ERR_IO_PENDING) {
read_pending_ = true;
} else {
LOG(ERROR) << "Read() returned error " << result;
}
}
}
void MessageReader::OnDataReceived(net::IOBuffer* data, int data_size) {
message_decoder_.AddData(data, data_size);
// Get list of all new messages first, and then call the callback
// for all of them.
std::vector<CompoundBuffer*> new_messages;
while (true) {
CompoundBuffer* buffer = message_decoder_.GetNextMessage();
if (!buffer)
break;
new_messages.push_back(buffer);
}
pending_messages_ += new_messages.size();
for (std::vector<CompoundBuffer*>::iterator it = new_messages.begin();
it != new_messages.end(); ++it) {
message_received_callback_->Run(*it, NewRunnableMethod(
this, &MessageReader::OnMessageDone, *it));
}
}
void MessageReader::OnMessageDone(CompoundBuffer* message) {
delete message;
ProcessDoneEvent();
}
void MessageReader::ProcessDoneEvent() {
if (MessageLoop::current() != message_loop_) {
message_loop_->PostTask(FROM_HERE, NewRunnableMethod(
this, &MessageReader::ProcessDoneEvent));
return;
}
pending_messages_--;
DCHECK_GE(pending_messages_, 0);
DoRead(); // Start next read if neccessary.
}
} // namespace protocol
} // namespace remoting
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