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// Copyright 2012 The Chromium Authors
// 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 <utility>
#include "base/compiler_specific.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/location.h"
#include "base/memory/ptr_util.h"
#include "base/task/single_thread_task_runner.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
#include "remoting/base/compound_buffer.h"
#include "remoting/proto/internal.pb.h"
#include "remoting/protocol/p2p_stream_socket.h"
namespace remoting::protocol {
static const int kReadBufferSize = 4096;
MessageReader::MessageReader() = default;
MessageReader::~MessageReader() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
void MessageReader::StartReading(
P2PStreamSocket* socket,
const MessageReceivedCallback& message_received_callback,
ReadFailedCallback read_failed_callback) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(!socket_);
DCHECK(socket);
DCHECK(message_received_callback);
DCHECK(read_failed_callback);
socket_ = socket;
message_received_callback_ = message_received_callback;
read_failed_callback_ = std::move(read_failed_callback);
DoRead();
}
void MessageReader::DoRead() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// 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_) {
read_buffer_ = base::MakeRefCounted<net::IOBufferWithSize>(kReadBufferSize);
int result = socket_->Read(
read_buffer_.get(), kReadBufferSize,
base::BindOnce(&MessageReader::OnRead, weak_factory_.GetWeakPtr()));
if (!HandleReadResult(result)) {
break;
}
}
}
void MessageReader::OnRead(int result) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(read_pending_);
read_pending_ = false;
if (!closed_) {
HandleReadResult(result);
DoRead();
}
}
bool MessageReader::HandleReadResult(int result) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(!closed_);
if (result > 0) {
OnDataReceived(read_buffer_.get(), result);
return true;
}
if (result == net::ERR_IO_PENDING) {
read_pending_ = true;
return true;
}
// Stop reading after any error.
closed_ = true;
LOG(ERROR) << "Read() returned error " << result;
std::move(read_failed_callback_).Run(result);
// |this| may be deleted.
return false;
}
void MessageReader::OnDataReceived(net::IOBuffer* data, int data_size) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
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;
}
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE,
base::BindOnce(&MessageReader::RunCallback, weak_factory_.GetWeakPtr(),
base::WrapUnique(buffer)));
}
}
void MessageReader::RunCallback(std::unique_ptr<CompoundBuffer> message) {
if (message_received_callback_) {
message_received_callback_.Run(std::move(message));
}
}
} // namespace remoting::protocol
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