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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.
#ifndef REMOTING_PROTOCOL_MESSAGE_READER_H_
#define REMOTING_PROTOCOL_MESSAGE_READER_H_
#include <memory>
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "remoting/base/compound_buffer.h"
#include "remoting/protocol/message_decoder.h"
namespace net {
class IOBuffer;
} // namespace net
namespace remoting::protocol {
class P2PStreamSocket;
// MessageReader reads data from the socket asynchronously and calls the
// callback for each message it receives. It stops calling the callback as soon
// as the socket is closed, so the socket should always be closed before the
// callback handler is destroyed.
//
// In order to throttle the stream, MessageReader doesn't try to read new data
// from the socket until all previously received messages are processed by the
// receiver (|done_task| is called for each message). It is still possible that
// the MessageReceivedCallback is called twice (so that there is more than one
// outstanding message), e.g. when we the sender sends multiple messages in one
// TCP packet.
class MessageReader {
public:
typedef base::RepeatingCallback<void(std::unique_ptr<CompoundBuffer> message)>
MessageReceivedCallback;
typedef base::OnceCallback<void(int)> ReadFailedCallback;
MessageReader();
MessageReader(const MessageReader&) = delete;
MessageReader& operator=(const MessageReader&) = delete;
virtual ~MessageReader();
// Starts reading from |socket|.
void StartReading(P2PStreamSocket* socket,
const MessageReceivedCallback& message_received_callback,
ReadFailedCallback read_failed_callback);
private:
void DoRead();
void OnRead(int result);
// Returns true on success, or runs |read_failed_callback_| and returns false
// on failure. When false is returned, |this| may be deleted.
bool HandleReadResult(int result);
void OnDataReceived(net::IOBuffer* data, int data_size);
void RunCallback(std::unique_ptr<CompoundBuffer> message);
bool DidReadFail();
ReadFailedCallback read_failed_callback_;
raw_ptr<P2PStreamSocket> socket_ = nullptr;
// Set to true, when we have a socket read pending, and expecting
// OnRead() to be called when new data is received.
bool read_pending_ = false;
bool closed_ = false;
scoped_refptr<net::IOBuffer> read_buffer_;
MessageDecoder message_decoder_;
// Callback is called when a message is received.
MessageReceivedCallback message_received_callback_;
SEQUENCE_CHECKER(sequence_checker_);
base::WeakPtrFactory<MessageReader> weak_factory_{this};
};
} // namespace remoting::protocol
#endif // REMOTING_PROTOCOL_MESSAGE_READER_H_
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