Add QuicDataChannel and QuicDataTransport classes

webrtc/api/quicdatatransport.h

Index: webrtc/api/quicdatatransport.h
diff --git a/webrtc/api/quicdatatransport.h b/webrtc/api/quicdatatransport.h
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+++ b/webrtc/api/quicdatatransport.h
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+/*
+ *  Copyright 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_API_QUICDATATRANSPORT_H_
+#define WEBRTC_API_QUICDATATRANSPORT_H_
+
+#include <string>
+#include <unordered_map>
+
+#include "webrtc/api/datachannelinterface.h"
+#include "webrtc/api/quicdatachannel.h"
+#include "webrtc/base/scoped_ref_ptr.h"
+#include "webrtc/base/sigslot.h"
+#include "webrtc/base/thread.h"
+
+namespace cricket {
+class QuicTransportChannel;
+class ReliableQuicStream;
+}  // namepsace cricket
+
+namespace webrtc {
+
+// QuicDataTransport creates QuicDataChannels for the PeerConnection. It also
+// handles QUIC stream demuxing by distributing incoming QUIC streams from the
+// QuicTransportChannel among the QuicDataChannels that it has created.
+//
+// QuicDataTransport reads the data channel ID from the incoming QUIC stream,
+// then looks it up in a map of ID => QuicDataChannel. If the data channel
+// exists, it sends the QUIC stream to the QuicDataChannel.
+class QuicDataTransport : public sigslot::has_slots<> {
+ public:
+  QuicDataTransport(rtc::Thread* signaling_thread, rtc::Thread* worker_thread);
+  ~QuicDataTransport() override;
+
+  // Sets the QUIC transport channel for the QuicDataChannels and the
+  // QuicDataTransport. Returns false if a different QUIC transport channel is
+  // already set, the QUIC transport channel cannot be set for any of the
+  // QuicDataChannels, or |channel| is NULL.
+  bool SetTransportChannel(cricket::QuicTransportChannel* channel);
+
+  // Creates a QuicDataChannel that uses this QuicDataTransport.
+  rtc::scoped_refptr<DataChannelInterface> CreateDataChannel(
+      const std::string& label,
+      const DataChannelInit* config);
+
+  // Removes a QuicDataChannel with the given ID from the QuicDataTransport's
+  // data channel map.
+  void DestroyDataChannel(int id);
+
+  // True if the QuicDataTransport has a data channel with the given ID.
+  bool HasDataChannel(int id) const;
+
+  // True if the QuicDataTransport has data channels.
+  bool HasDataChannels() const;
+
+ private:
+  // Called from the QuicTransportChannel when a ReliableQuicStream is created
+  // to receive incoming data.
+  void OnIncomingStream(cricket::ReliableQuicStream* stream);
+  // Called from the ReliableQuicStream when the first QUIC stream frame is
+  // received for incoming data. The QuicDataTransport reads the data channel ID
+  // and message ID from the incoming data, then dispatches the
+  // ReliableQuicStream to the QuicDataChannel with the same data channel ID.
+  void OnDataReceived(net::QuicStreamId stream_id,
+                      const char* data,
+                      size_t len);
+
+  // Map of data channel ID => QUIC data channel values.
+  std::unordered_map<int, rtc::scoped_refptr<QuicDataChannel>>
+      data_channel_by_id_;
+  // Map of QUIC stream ID => ReliableQuicStream* values.
+  std::unordered_map<net::QuicStreamId, cricket::ReliableQuicStream*>
+      quic_stream_by_id_;
+  // QuicTransportChannel for sending/receiving data.
+  cricket::QuicTransportChannel* quic_transport_channel_ = nullptr;
+  // Signaling and worker threads for the QUIC data channel.
+  rtc::Thread* const signaling_thread_;
+  rtc::Thread* const worker_thread_;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_API_QUICDATATRANSPORT_H_