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// 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_(nullptr),
read_pending_(false),
pending_messages_(0),
closed_(false),
weak_factory_(this) {
}
MessageReader::~MessageReader() {
}
void MessageReader::SetMessageReceivedCallback(
const MessageReceivedCallback& callback) {
DCHECK(CalledOnValidThread());
message_received_callback_ = callback;
}
void MessageReader::StartReading(
net::Socket* socket,
const ReadFailedCallback& read_failed_callback) {
DCHECK(CalledOnValidThread());
DCHECK(socket);
DCHECK(!read_failed_callback.is_null());
socket_ = socket;
read_failed_callback_ = read_failed_callback;
DoRead();
}
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.
bool read_succeeded = true;
while (read_succeeded && !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, &read_succeeded);
}
}
void MessageReader::OnRead(int result) {
DCHECK(CalledOnValidThread());
DCHECK(read_pending_);
read_pending_ = false;
if (!closed_) {
bool read_succeeded;
HandleReadResult(result, &read_succeeded);
if (read_succeeded)
DoRead();
}
}
void MessageReader::HandleReadResult(int result, bool* read_succeeded) {
DCHECK(CalledOnValidThread());
if (closed_)
return;
*read_succeeded = true;
if (result > 0) {
OnDataReceived(read_buffer_.get(), result);
*read_succeeded = true;
} else if (result == net::ERR_IO_PENDING) {
read_pending_ = true;
} else {
DCHECK_LT(result, 0);
// Stop reading after any error.
closed_ = true;
*read_succeeded = false;
LOG(ERROR) << "Read() returned error " << result;
read_failed_callback_.Run(result);
}
}
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(make_scoped_ptr(buffer))));
}
}
void MessageReader::RunCallback(scoped_ptr<CompoundBuffer> message) {
if (!message_received_callback_.is_null()){
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
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