Implement video frame acknowledgements in the chromoting protocol.

remoting/protocol/client_video_dispatcher_unittest.cc

+// 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.
+
+#include "remoting/protocol/client_video_dispatcher.h"
+
+#include "base/bind.h"
+#include "base/memory/scoped_vector.h"
+#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "remoting/base/constants.h"
+#include "remoting/proto/video.pb.h"
+#include "remoting/protocol/fake_session.h"
+#include "remoting/protocol/fake_stream_socket.h"
+#include "remoting/protocol/message_serialization.h"
+#include "remoting/protocol/video_stub.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace remoting {
+namespace protocol {
+
+class ClientVideoDispatcherTest : public testing::Test,
+                                  public VideoStub,
+                                  public ChannelDispatcherBase::EventHandler {
+ public:
+  ClientVideoDispatcherTest()

[Wez, 2015/02/11 02:22:56]

nit: Move the function bodies out of the class declaration so they'll be more
readable.

[Sergey Ulanov, 2015/02/17 19:37:07]

Done.

+      : initialized_(false),
+        dispatcher_(this),
+        parser_(base::Bind(&ClientVideoDispatcherTest::OnVideoAck,
+                           base::Unretained(this)),
+                &reader_) {
+  }
+
+  void Initialize() {
+    dispatcher_.Init(
+        &session_,
+        ChannelConfig(ChannelConfig::TRANSPORT_MUX_STREAM,
+                      kDefaultStreamVersion, ChannelConfig::CODEC_UNDEFINED),
+        this);
+    base::RunLoop().RunUntilIdle();
+    DCHECK(initialized_);
+    host_socket_.PairWith(
+        session_.fake_channel_factory().GetFakeChannel(kVideoChannelName));
+    reader_.StartReading(&host_socket_);
+    writer_.Init(&host_socket_, BufferedSocketWriter::WriteFailedCallback());
+  }
+
+  // VideoStub interface.
+  void ProcessVideoPacket(scoped_ptr<VideoPacket> video_packet,
+                          const base::Closure& done) {
+    video_packets_.push_back(video_packet.release());
+    packet_done_callbacks_.push_back(done);
+  }
+
+  // ChannelDispatcherBase::EventHandler interface.
+  void OnChannelInitialized(ChannelDispatcherBase* channel_dispatcher) {
+    initialized_ = true;
+  }
+  void OnChannelError(ChannelDispatcherBase* channel_dispatcher,
+                      ErrorCode error) {
+    // Don't expect channel creation to fail.
+    FAIL();
+  }
+
+ protected:
+  void OnVideoAck(scoped_ptr<VideoAck> ack, const base::Closure& done) {
+    ack_messages_.push_back(ack.release());
+    done.Run();
+  }
+
+  base::MessageLoop message_loop_;
+
+  // Set to true in OnChannelInitialized().
+  bool initialized_;
+
+  // Client side.
+  ClientVideoDispatcher dispatcher_;
+  FakeSession session_;
+
+  // Host side.
+  FakeStreamSocket host_socket_;
+  MessageReader reader_;
+  ProtobufMessageParser<VideoAck> parser_;
+  BufferedSocketWriter writer_;
+
+  ScopedVector<VideoPacket> video_packets_;
+  std::vector<base::Closure> packet_done_callbacks_;
+
+  ScopedVector<VideoAck> ack_messages_;
+};
+
+// Verify that the client can receive video packets and acks are not sent for
+// VideoPackets that don't have frame_id field set.
+TEST_F(ClientVideoDispatcherTest, WithoutAcks) {
+  Initialize();
+
+  VideoPacket packet;
+  packet.set_data(std::string());
+
+  // Send a VideoPacket and verify that the client receives it.
+  writer_.Write(SerializeAndFrameMessage(packet), base::Closure());
+  base::RunLoop().RunUntilIdle();
+  EXPECT_EQ(1U, video_packets_.size());
+
+  packet_done_callbacks_.front().Run();
+  base::RunLoop().RunUntilIdle();
+
+  // Ack should never be sent for the packet without frame_id.
+  EXPECT_TRUE(ack_messages_.empty());
+}
+
+// Verifies that the dispatcher sends Ack message with correct rendering delay.
+TEST_F(ClientVideoDispatcherTest, WithAcks) {
+  int kTestFrameId = 3;
+
+  Initialize();
+
+  VideoPacket packet;
+  packet.set_data(std::string());
+  packet.set_frame_id(kTestFrameId);
+
+  // Send a VideoPacket and verify that the client receives it.
+  writer_.Write(SerializeAndFrameMessage(packet), base::Closure());
+  base::RunLoop().RunUntilIdle();
+  EXPECT_EQ(1U, video_packets_.size());
+
+  // Ack should only be sent after the packet is processed.
+  EXPECT_TRUE(ack_messages_.empty());
+  base::RunLoop().RunUntilIdle();
+
+  // Fake completion of video packet decoding, to trigger the Ack.
+  packet_done_callbacks_.front().Run();
+  base::RunLoop().RunUntilIdle();
+
+  // Verify that the Ack message has been received.
+  ASSERT_EQ(1U, ack_messages_.size());
+  EXPECT_EQ(kTestFrameId, ack_messages_[0]->frame_id());
+}
+
+// Verify that Ack messages are sent in correct order.
+TEST_F(ClientVideoDispatcherTest, AcksOrder) {
+  int kTestFrameId = 3;
+
+  Initialize();
+
+  VideoPacket packet;
+  packet.set_data(std::string());
+  packet.set_frame_id(kTestFrameId);
+
+  // Send two VideoPackets.
+  writer_.Write(SerializeAndFrameMessage(packet), base::Closure());
+  base::RunLoop().RunUntilIdle();
+
+  packet.set_frame_id(kTestFrameId + 1);
+  writer_.Write(SerializeAndFrameMessage(packet), base::Closure());
+  base::RunLoop().RunUntilIdle();
+
+  EXPECT_EQ(2U, video_packets_.size());
+  EXPECT_TRUE(ack_messages_.empty());
+
+  // Call completion callbacks in revers order.
+  packet_done_callbacks_[1].Run();
+  packet_done_callbacks_[0].Run();
+
+  base::RunLoop().RunUntilIdle();
+
+  // Verify order of Ack messages.
+  ASSERT_EQ(2U, ack_messages_.size());
+  EXPECT_EQ(kTestFrameId, ack_messages_[0]->frame_id());
+  EXPECT_EQ(kTestFrameId + 1, ack_messages_[1]->frame_id());
+}
+
+}  // namespace protocol
+}  // namespace remoting