Adds an internal server and chromium's flag for disabling/enabling FEC

net/quic/quic_connection_test.cc

 // 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.
 
 #include "net/quic/quic_connection.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/stl_util.h"
 #include "net/base/net_errors.h"
@@ skipping 1466 matching lines @@
   // GetPacketLengthForOneStream() assumes a stream offset of 0 in determining
   // packet length. The size of the offset field in a stream frame is 0 for
   // offset 0, and 2 for non-zero offsets up through 64K. Increase
   // max_packet_length by 2 so that subsequent packets containing subsequent
   // stream frames with non-zero offets will fit within the packet length.
   size_t length = 2 + GetPacketLengthForOneStream(
           connection_.version(), kIncludeVersion, PACKET_1BYTE_SEQUENCE_NUMBER,
           IN_FEC_GROUP, &payload_length);
   creator->set_max_packet_length(length);
 
-  // Enable FEC.
-  creator->set_max_packets_per_fec_group(2);
-
-  // Send 4 protected data packets, which will also trigger 2 FEC packets.
-  EXPECT_CALL(*send_algorithm_, OnPacketSent(_, _, _, _, _)).Times(6);
+  // Send 4 protected data packets, which should also trigger 1 FEC packet.
+  EXPECT_CALL(*send_algorithm_, OnPacketSent(_, _, _, _, _)).Times(5);
   // The first stream frame will have 2 fewer overhead bytes than the other 3.
   const string payload(payload_length * 4 + 2, 'a');
   connection_.SendStreamDataWithStringWithFec(1, payload, 0, !kFin, NULL);
   // Expect the FEC group to be closed after SendStreamDataWithString.
   EXPECT_FALSE(creator->IsFecGroupOpen());
   EXPECT_FALSE(creator->IsFecProtected());
 }
 
 TEST_P(QuicConnectionTest, FECQueueing) {
   // All packets carry version info till version is negotiated.
   size_t payload_length;
   QuicPacketCreator* creator =
       QuicConnectionPeer::GetPacketCreator(&connection_);
   size_t length = GetPacketLengthForOneStream(
       connection_.version(), kIncludeVersion, PACKET_1BYTE_SEQUENCE_NUMBER,
       IN_FEC_GROUP, &payload_length);
   creator->set_max_packet_length(length);
-  // Enable FEC.
-  creator->set_max_packets_per_fec_group(1);
+  EXPECT_TRUE(creator->IsFecEnabled());
 
   EXPECT_EQ(0u, connection_.NumQueuedPackets());
   BlockOnNextWrite();
   const string payload(payload_length, 'a');
   connection_.SendStreamDataWithStringWithFec(1, payload, 0, !kFin, NULL);
   EXPECT_FALSE(creator->IsFecGroupOpen());
   EXPECT_FALSE(creator->IsFecProtected());
   // Expect the first data packet and the fec packet to be queued.
   EXPECT_EQ(2u, connection_.NumQueuedPackets());
 }
 
 TEST_P(QuicConnectionTest, AbandonFECFromCongestionWindow) {
-  // Enable FEC.
-  QuicConnectionPeer::GetPacketCreator(
-      &connection_)->set_max_packets_per_fec_group(1);
+  EXPECT_TRUE(QuicConnectionPeer::GetPacketCreator(
+      &connection_)->IsFecEnabled());
 
   // 1 Data and 1 FEC packet.
   EXPECT_CALL(*send_algorithm_, OnPacketSent(_, _, _, _, _)).Times(2);
   connection_.SendStreamDataWithStringWithFec(3, "foo", 0, !kFin, NULL);
 
   const QuicTime::Delta retransmission_time =
       QuicTime::Delta::FromMilliseconds(5000);
   clock_.AdvanceTime(retransmission_time);
 
   // Abandon FEC packet and data packet.
   EXPECT_CALL(*send_algorithm_, OnRetransmissionTimeout(true));
   EXPECT_CALL(*send_algorithm_, OnPacketSent(_, _, _, _, _)).Times(1);
   EXPECT_CALL(visitor_, OnCanWrite());
   connection_.OnRetransmissionTimeout();
 }
 
 TEST_P(QuicConnectionTest, DontAbandonAckedFEC) {
   EXPECT_CALL(visitor_, OnSuccessfulVersionNegotiation(_));
-  // Enable FEC.
-  QuicConnectionPeer::GetPacketCreator(
-      &connection_)->set_max_packets_per_fec_group(1);
+  EXPECT_TRUE(QuicConnectionPeer::GetPacketCreator(
+      &connection_)->IsFecEnabled());
 
   // 1 Data and 1 FEC packet.
   EXPECT_CALL(*send_algorithm_, OnPacketSent(_, _, _, _, _)).Times(6);
   connection_.SendStreamDataWithStringWithFec(3, "foo", 0, !kFin, NULL);
   // Send some more data afterwards to ensure early retransmit doesn't trigger.
   connection_.SendStreamDataWithStringWithFec(3, "foo", 3, !kFin, NULL);
   connection_.SendStreamDataWithStringWithFec(3, "foo", 6, !kFin, NULL);
 
   QuicAckFrame ack_fec = InitAckFrame(2, 1);
   // Data packet missing.
   // TODO(ianswett): Note that this is not a sensible ack, since if the FEC was
   // received, it would cause the covered packet to be acked as well.
   NackPacket(1, &ack_fec);
   EXPECT_CALL(*send_algorithm_, OnCongestionEvent(true, _, _, _));
   ProcessAckPacket(&ack_fec);
   clock_.AdvanceTime(DefaultRetransmissionTime());
 
   // Don't abandon the acked FEC packet, but it will abandon 2 the subsequent
   // FEC packets.
   EXPECT_CALL(*send_algorithm_, OnRetransmissionTimeout(true));
   EXPECT_CALL(*send_algorithm_, OnPacketSent(_, _, _, _, _)).Times(3);
   connection_.GetRetransmissionAlarm()->Fire();
 }
 
 TEST_P(QuicConnectionTest, AbandonAllFEC) {
   EXPECT_CALL(visitor_, OnSuccessfulVersionNegotiation(_));
-  // Enable FEC.
-  QuicConnectionPeer::GetPacketCreator(
-      &connection_)->set_max_packets_per_fec_group(1);
+  EXPECT_TRUE(QuicConnectionPeer::GetPacketCreator(
+      &connection_)->IsFecEnabled());
 
   // 1 Data and 1 FEC packet.
   EXPECT_CALL(*send_algorithm_, OnPacketSent(_, _, _, _, _)).Times(6);
   connection_.SendStreamDataWithStringWithFec(3, "foo", 0, !kFin, NULL);
   // Send some more data afterwards to ensure early retransmit doesn't trigger.
   connection_.SendStreamDataWithStringWithFec(3, "foo", 3, !kFin, NULL);
   // Advance the time so not all the FEC packets are abandoned.
   clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(1));
   connection_.SendStreamDataWithStringWithFec(3, "foo", 6, !kFin, NULL);
 
@@ skipping 94 matching lines @@
   EXPECT_EQ(0u, connection_.NumQueuedPackets());
   EXPECT_FALSE(connection_.HasQueuedData());
 
   // Parse the last packet and ensure it's the stream frame from stream 3.
   EXPECT_EQ(1u, writer_->frame_count());
   ASSERT_EQ(1u, writer_->stream_frames().size());
   EXPECT_EQ(kClientDataStreamId1, writer_->stream_frames()[0].stream_id);
 }
 
 TEST_P(QuicConnectionTest, FramePackingFEC) {
-  // Enable FEC.
-  QuicConnectionPeer::GetPacketCreator(
-      &connection_)->set_max_packets_per_fec_group(6);
+  EXPECT_TRUE(QuicConnectionPeer::GetPacketCreator(
+      &connection_)->IsFecEnabled());
 
   CongestionBlockWrites();
 
   // Queue an ack and two stream frames. Ack gets flushed when FEC is turned on
   // for sending protected data; two stream frames are packing in 1 packet.
   EXPECT_CALL(visitor_, OnCanWrite()).WillOnce(DoAll(
       IgnoreResult(InvokeWithoutArgs(
           &connection_, &TestConnection::SendStreamData3WithFec)),
       IgnoreResult(InvokeWithoutArgs(
           &connection_, &TestConnection::SendStreamData5WithFec))));
@@ skipping 2331 matching lines @@
   QuicBlockedFrame blocked;
   blocked.stream_id = 3;
   EXPECT_CALL(visitor_, OnBlockedFrames(_));
   ProcessFramePacket(QuicFrame(&blocked));
   EXPECT_TRUE(ack_alarm->IsSet());
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace net