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// Copyright (c) 2013 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/congestion_control/pacing_sender.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "net/quic/quic_protocol.h"
#include "net/quic/test_tools/mock_clock.h"
#include "net/quic/test_tools/quic_test_utils.h"
#include "testing/gtest/include/gtest/gtest.h"
using testing::Return;
using testing::StrictMock;
namespace net {
namespace test {
class PacingSenderTest : public ::testing::Test {
protected:
PacingSenderTest()
: zero_time_(QuicTime::Delta::Zero()),
infinite_time_(QuicTime::Delta::Infinite()),
sequence_number_(1),
mock_sender_(new StrictMock<MockSendAlgorithm>()),
pacing_sender_(new PacingSender(mock_sender_,
QuicTime::Delta::FromMilliseconds(1))) {
// Pick arbitrary time.
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(9));
}
virtual ~PacingSenderTest() {}
void CheckPacketIsSentImmediately() {
// In order for the packet to be sendable, the underlying sender must
// permit it to be sent immediately.
EXPECT_CALL(*mock_sender_, TimeUntilSend(clock_.Now(),
HAS_RETRANSMITTABLE_DATA))
.WillOnce(Return(zero_time_));
// Verify that the packet can be sent immediately.
EXPECT_EQ(zero_time_,
pacing_sender_->TimeUntilSend(clock_.Now(),
HAS_RETRANSMITTABLE_DATA));
// Actually send the packet.
EXPECT_CALL(*mock_sender_,
OnPacketSent(clock_.Now(), sequence_number_, kMaxPacketSize,
HAS_RETRANSMITTABLE_DATA));
pacing_sender_->OnPacketSent(clock_.Now(), sequence_number_++,
kMaxPacketSize,
HAS_RETRANSMITTABLE_DATA);
}
void CheckAckIsSentImmediately() {
// In order for the ack to be sendable, the underlying sender must
// permit it to be sent immediately.
EXPECT_CALL(*mock_sender_, TimeUntilSend(clock_.Now(),
NO_RETRANSMITTABLE_DATA))
.WillOnce(Return(zero_time_));
// Verify that the ACK can be sent immediately.
EXPECT_EQ(zero_time_,
pacing_sender_->TimeUntilSend(clock_.Now(),
NO_RETRANSMITTABLE_DATA));
// Actually send the packet.
EXPECT_CALL(*mock_sender_,
OnPacketSent(clock_.Now(), sequence_number_, kMaxPacketSize,
NO_RETRANSMITTABLE_DATA));
pacing_sender_->OnPacketSent(clock_.Now(), sequence_number_++,
kMaxPacketSize,
NO_RETRANSMITTABLE_DATA);
}
void CheckPacketIsDelayed(QuicTime::Delta delay) {
// In order for the packet to be sendable, the underlying sender must
// permit it to be sent immediately.
EXPECT_CALL(*mock_sender_, TimeUntilSend(clock_.Now(),
HAS_RETRANSMITTABLE_DATA))
.WillOnce(Return(zero_time_));
// Verify that the packet is delayed.
EXPECT_EQ(delay.ToMicroseconds(),
pacing_sender_->TimeUntilSend(
clock_.Now(), HAS_RETRANSMITTABLE_DATA).ToMicroseconds());
}
const QuicTime::Delta zero_time_;
const QuicTime::Delta infinite_time_;
MockClock clock_;
QuicPacketSequenceNumber sequence_number_;
StrictMock<MockSendAlgorithm>* mock_sender_;
scoped_ptr<PacingSender> pacing_sender_;
};
TEST_F(PacingSenderTest, NoSend) {
EXPECT_CALL(*mock_sender_, TimeUntilSend(clock_.Now(),
HAS_RETRANSMITTABLE_DATA))
.WillOnce(Return(infinite_time_));
EXPECT_EQ(infinite_time_,
pacing_sender_->TimeUntilSend(clock_.Now(),
HAS_RETRANSMITTABLE_DATA));
}
TEST_F(PacingSenderTest, SendNow) {
EXPECT_CALL(*mock_sender_, TimeUntilSend(clock_.Now(),
HAS_RETRANSMITTABLE_DATA))
.WillOnce(Return(zero_time_));
EXPECT_EQ(zero_time_,
pacing_sender_->TimeUntilSend(clock_.Now(),
HAS_RETRANSMITTABLE_DATA));
}
TEST_F(PacingSenderTest, VariousSending) {
// Configure bandwith of 1 packet per 2 ms, for which the pacing rate
// will be 1 packet per 1 ms.
EXPECT_CALL(*mock_sender_, BandwidthEstimate())
.WillRepeatedly(Return(QuicBandwidth::FromBytesAndTimeDelta(
kMaxPacketSize, QuicTime::Delta::FromMilliseconds(2))));
// Send a whole pile of packets, and verify that they are not paced.
for (int i = 0 ; i < 1000; ++i) {
CheckPacketIsSentImmediately();
}
// Now update the RTT and verify that packets are actually paced.
EXPECT_CALL(*mock_sender_, OnRttUpdated(1));
pacing_sender_->OnRttUpdated(1);
CheckPacketIsSentImmediately();
CheckPacketIsSentImmediately();
CheckPacketIsSentImmediately();
// The first packet was a "make up", then we sent two packets "into the
// future", so the delay should be 2.
CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2));
// Wake up on time.
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(2));
CheckPacketIsSentImmediately();
CheckPacketIsSentImmediately();
CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2));
CheckAckIsSentImmediately();
// Wake up late.
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(4));
CheckPacketIsSentImmediately();
CheckPacketIsSentImmediately();
CheckPacketIsSentImmediately();
CheckPacketIsSentImmediately();
CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2));
// Wake up too early.
CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2));
// Wake up early, but after enough time has passed to permit a send.
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(1));
CheckPacketIsSentImmediately();
CheckPacketIsDelayed(QuicTime::Delta::FromMilliseconds(2));
}
} // namespace test
} // namespace net
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