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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.
#ifndef REMOTING_PROTOCOL_CHANNEL_MULTIPLEXER_H_
#define REMOTING_PROTOCOL_CHANNEL_MULTIPLEXER_H_
#include <memory>
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "remoting/base/buffered_socket_writer.h"
#include "remoting/proto/mux.pb.h"
#include "remoting/protocol/message_reader.h"
#include "remoting/protocol/stream_channel_factory.h"
namespace remoting {
namespace protocol {
class ChannelMultiplexer : public StreamChannelFactory {
public:
static const char kMuxChannelName[];
// |factory| is used to create the channel upon which to multiplex.
ChannelMultiplexer(StreamChannelFactory* factory,
const std::string& base_channel_name);
~ChannelMultiplexer() override;
// StreamChannelFactory interface.
void CreateChannel(const std::string& name,
const ChannelCreatedCallback& callback) override;
void CancelChannelCreation(const std::string& name) override;
private:
struct PendingChannel;
class MuxChannel;
class MuxSocket;
friend class MuxChannel;
// Callback for |base_channel_| creation.
void OnBaseChannelReady(std::unique_ptr<P2PStreamSocket> socket);
// Helper to create channels asynchronously.
void DoCreatePendingChannels();
// Helper method used to create channels.
MuxChannel* GetOrCreateChannel(const std::string& name);
// Error handling callback for |reader_| and |writer_|.
void OnBaseChannelError(int error);
// Propagates base channel error to channel |name|, queued asynchronously by
// OnBaseChannelError().
void NotifyBaseChannelError(const std::string& name, int error);
// Callback for |reader_;
void OnIncomingPacket(std::unique_ptr<CompoundBuffer> buffer);
// Called by MuxChannel.
void DoWrite(std::unique_ptr<MultiplexPacket> packet,
const base::Closure& done_task);
// Factory used to create |base_channel_|. Set to nullptr once creation is
// finished or failed.
StreamChannelFactory* base_channel_factory_;
// Name of the underlying channel.
std::string base_channel_name_;
// The channel over which to multiplex.
std::unique_ptr<P2PStreamSocket> base_channel_;
// List of requested channels while we are waiting for |base_channel_|.
std::list<PendingChannel> pending_channels_;
int next_channel_id_;
std::map<std::string, std::unique_ptr<MuxChannel>> channels_;
// Channels are added to |channels_by_receive_id_| only after we receive
// receive_id from the remote peer.
std::map<int, MuxChannel*> channels_by_receive_id_;
BufferedSocketWriter writer_;
MessageReader reader_;
base::WeakPtrFactory<ChannelMultiplexer> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(ChannelMultiplexer);
};
} // namespace protocol
} // namespace remoting
#endif // REMOTING_PROTOCOL_CHANNEL_MULTIPLEXER_H_
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