Implement WebrtcTransport

remoting/protocol/webrtc_transport.h

+// Copyright 2015 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_WEBRTC_TRANSPORT_H_
+#define REMOTING_PROTOCOL_WEBRTC_TRANSPORT_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
+#include "base/memory/weak_ptr.h"
+#include "base/threading/thread.h"
+#include "base/timer/timer.h"
+#include "remoting/protocol/transport.h"
+#include "remoting/signaling/signal_strategy.h"
+#include "third_party/libjingle/source/talk/app/webrtc/peerconnectioninterface.h"
+
+namespace remoting {
+namespace protocol {
+
+class WebrtcTransport : public Transport,
+                        public webrtc::PeerConnectionObserver {
+ public:
+  WebrtcTransport(
+      rtc::scoped_refptr<webrtc::PortAllocatorFactoryInterface>
+          port_allocator_factory,
+      TransportRole role,
+      scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner);
+  ~WebrtcTransport() override;
+
+  // Transport interface.
+  void Start(EventHandler* event_handler,

[kelvinp, 2015/11/11 23:38:48]

Is it guaranteed that the event_handler will always be called in the caller
thread?

[Sergey Ulanov, 2015/11/17 01:40:32]

Yes. Transport is a single-threaded interface that's used only on the network
thread. It the default threading semantics for all code in remoting/protocol.

+             Authenticator* authenticator) override;
+  bool ProcessTransportInfo(buzz::XmlElement* transport_info) override;
+  DatagramChannelFactory* GetDatagramChannelFactory() override;
+  StreamChannelFactory* GetStreamChannelFactory() override;
+  StreamChannelFactory* GetMultiplexedChannelFactory() override;
+
+ private:
+  void DoStart(rtc::Thread* worker_thread);
+  void OnLocalSessionDescriptionCreated(
+      scoped_ptr<webrtc::SessionDescriptionInterface> description,
+      const std::string& error);
+  void OnLocalDescriptionSet(bool success, const std::string& error);
+  void OnRemoteDescriptionSet(bool success, const std::string& error);
+
+  // webrtc::PeerConnectionObserver interface.
+  void OnSignalingChange(
+      webrtc::PeerConnectionInterface::SignalingState new_state) override;
+  void OnAddStream(webrtc::MediaStreamInterface* stream) override;
+  void OnRemoveStream(webrtc::MediaStreamInterface* stream) override;
+  void OnDataChannel(webrtc::DataChannelInterface* data_channel) override;
+  void OnRenegotiationNeeded() override;
+  void OnIceConnectionChange(
+      webrtc::PeerConnectionInterface::IceConnectionState new_state) override;
+  void OnIceGatheringChange(
+      webrtc::PeerConnectionInterface::IceGatheringState new_state) override;
+  void OnIceCandidate(const webrtc::IceCandidateInterface* candidate) override;
+
+  void EnsurePendingTransportInfoMessage();
+  void SendTransportInfo();
+  void AddPendingCandidatesIfPossible();
+
+  void Close(ErrorCode error);
+
+  rtc::scoped_refptr<webrtc::PortAllocatorFactoryInterface>
+      port_allocator_factory_;
+  TransportRole role_;
+  EventHandler* event_handler_ = nullptr;
+  scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner_;
+
+  rtc::scoped_refptr<webrtc::PeerConnectionFactoryInterface>
+      peer_connection_factory_;
+  rtc::scoped_refptr<webrtc::PeerConnectionInterface> peer_connection_;
+
+  scoped_ptr<buzz::XmlElement> pending_transport_info_message_;
+  base::OneShotTimer transport_info_timer_;
+
+  ScopedVector<webrtc::IceCandidateInterface> pending_incoming_candidates_;
+
+  std::list<rtc::scoped_refptr<webrtc::MediaStreamInterface>>
+      unclaimed_streams_;
+
+  base::WeakPtrFactory<WebrtcTransport> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebrtcTransport);
+};
+
+class WebrtcTransportFactory : public TransportFactory {
+ public:
+  WebrtcTransportFactory(
+      SignalStrategy* signal_strategy,
+      rtc::scoped_refptr<webrtc::PortAllocatorFactoryInterface>
+          port_allocator_factory,
+      TransportRole role);
+  ~WebrtcTransportFactory() override;
+
+  // TransportFactory interface.
+  scoped_ptr<Transport> CreateTransport() override;
+
+ private:
+  SignalStrategy* signal_strategy_;
+  rtc::scoped_refptr<webrtc::PortAllocatorFactoryInterface>
+      port_allocator_factory_;
+  TransportRole role_;
+
+  base::Thread worker_thread_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebrtcTransportFactory);
+};
+
+}  // namespace protocol
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_WEBRTC_TRANSPORT_H_