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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_CONNECTION_TO_HOST_H_
#define REMOTING_PROTOCOL_CONNECTION_TO_HOST_H_
#include <set>
#include <string>
#include "base/callback_forward.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "remoting/proto/internal.pb.h"
#include "remoting/protocol/clipboard_filter.h"
#include "remoting/protocol/errors.h"
#include "remoting/protocol/input_filter.h"
#include "remoting/protocol/message_reader.h"
#include "remoting/protocol/monitored_video_stub.h"
#include "remoting/protocol/session.h"
#include "remoting/protocol/session_config.h"
#include "remoting/protocol/session_manager.h"
#include "remoting/signaling/signal_strategy.h"
namespace remoting {
class XmppProxy;
class VideoPacket;
namespace protocol {
class AudioReader;
class AudioStub;
class Authenticator;
class ClientControlDispatcher;
class ClientEventDispatcher;
class ClientStub;
class ClipboardStub;
class HostStub;
class InputStub;
class SessionConfig;
class TransportFactory;
class ClientVideoDispatcher;
class VideoStub;
class ConnectionToHost : public SignalStrategy::Listener,
public SessionManager::Listener,
public Session::EventHandler,
public base::NonThreadSafe {
public:
// The UI implementations maintain corresponding definitions of this
// enumeration in webapp/client_session.js and
// android/java/src/org/chromium/chromoting/jni/JniInterface.java. Be sure to
// update these locations if you make any changes to the ordering.
enum State {
INITIALIZING,
CONNECTING,
AUTHENTICATED,
CONNECTED,
FAILED,
CLOSED,
};
class HostEventCallback {
public:
virtual ~HostEventCallback() {}
// Called when state of the connection changes.
virtual void OnConnectionState(State state, ErrorCode error) = 0;
// Called when ready state of the connection changes. When |ready|
// is set to false some data sent by the peers may be
// delayed. This is used to indicate in the UI when connection is
// temporarily broken.
virtual void OnConnectionReady(bool ready) = 0;
// Called when the route type (direct vs. STUN vs. proxied) changes.
virtual void OnRouteChanged(const std::string& channel_name,
const protocol::TransportRoute& route) = 0;
};
ConnectionToHost();
~ConnectionToHost() override;
// Allows to set a custom protocol configuration (e.g. for tests). Cannot be
// called after Connect().
void set_candidate_config(scoped_ptr<CandidateSessionConfig> config);
// Set the stubs which will handle messages from the host.
// The caller must ensure that stubs out-live the connection.
// Unless otherwise specified, all stubs must be set before Connect()
// is called.
void set_client_stub(ClientStub* client_stub);
void set_clipboard_stub(ClipboardStub* clipboard_stub);
void set_video_stub(VideoStub* video_stub);
// If no audio stub is specified then audio will not be requested.
void set_audio_stub(AudioStub* audio_stub);
// Initiates a connection to the host specified by |host_jid|.
// |signal_strategy| is used to signal to the host, and must outlive the
// connection. Data channels will be negotiated over |transport_factory|.
// |authenticator| will be used to authenticate the session and data channels.
// |event_callback| will be notified of changes in the state of the connection
// and must outlive the ConnectionToHost.
// Caller must set stubs (see below) before calling Connect.
virtual void Connect(SignalStrategy* signal_strategy,
scoped_ptr<TransportFactory> transport_factory,
scoped_ptr<Authenticator> authenticator,
const std::string& host_jid,
HostEventCallback* event_callback);
// Returns the session configuration that was negotiated with the host.
virtual const SessionConfig& config();
// Stubs for sending data to the host.
virtual ClipboardStub* clipboard_forwarder();
virtual HostStub* host_stub();
virtual InputStub* input_stub();
// SignalStrategy::StatusObserver interface.
void OnSignalStrategyStateChange(SignalStrategy::State state) override;
bool OnSignalStrategyIncomingStanza(const buzz::XmlElement* stanza) override;
// SessionManager::Listener interface.
void OnSessionManagerReady() override;
void OnIncomingSession(
Session* session,
SessionManager::IncomingSessionResponse* response) override;
// Session::EventHandler interface.
void OnSessionStateChange(Session::State state) override;
void OnSessionRouteChange(const std::string& channel_name,
const TransportRoute& route) override;
// MonitoredVideoStub::EventHandler interface.
virtual void OnVideoChannelStatus(bool active);
// Return the current state of ConnectionToHost.
State state() const;
private:
// Callbacks for channel initialization
void OnChannelInitialized(bool successful);
void NotifyIfChannelsReady();
void CloseOnError(ErrorCode error);
// Stops writing in the channels.
void CloseChannels();
void SetState(State state, ErrorCode error);
std::string host_jid_;
std::string host_public_key_;
scoped_ptr<Authenticator> authenticator_;
HostEventCallback* event_callback_;
scoped_ptr<CandidateSessionConfig> candidate_config_;
// Stub for incoming messages.
ClientStub* client_stub_;
ClipboardStub* clipboard_stub_;
AudioStub* audio_stub_;
SignalStrategy* signal_strategy_;
scoped_ptr<SessionManager> session_manager_;
scoped_ptr<Session> session_;
scoped_ptr<MonitoredVideoStub> monitored_video_stub_;
scoped_ptr<ClientVideoDispatcher> video_dispatcher_;
scoped_ptr<AudioReader> audio_reader_;
scoped_ptr<ClientControlDispatcher> control_dispatcher_;
scoped_ptr<ClientEventDispatcher> event_dispatcher_;
ClipboardFilter clipboard_forwarder_;
InputFilter event_forwarder_;
// Internal state of the connection.
State state_;
ErrorCode error_;
private:
DISALLOW_COPY_AND_ASSIGN(ConnectionToHost);
};
} // namespace protocol
} // namespace remoting
#endif // REMOTING_PROTOCOL_CONNECTION_TO_HOST_H_
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