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// Copyright 2014 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_flow_controller.h"
#include "base/format_macros.h"
#include "base/strings/stringprintf.h"
#include "net/quic/quic_flags.h"
#include "net/quic/quic_utils.h"
#include "net/quic/test_tools/quic_connection_peer.h"
#include "net/quic/test_tools/quic_flow_controller_peer.h"
#include "net/quic/test_tools/quic_sent_packet_manager_peer.h"
#include "net/quic/test_tools/quic_test_utils.h"
#include "net/test/gtest_util.h"
#include "testing/gmock/include/gmock/gmock.h"
namespace net {
namespace test {
// Receive window auto-tuning uses RTT in its logic.
const int64 kRtt = 100;
class QuicFlowControllerTest : public ::testing::Test {
public:
QuicFlowControllerTest()
: stream_id_(1234),
send_window_(kInitialSessionFlowControlWindowForTest),
receive_window_(kInitialSessionFlowControlWindowForTest),
connection_(Perspective::IS_CLIENT) {}
void Initialize() {
flow_controller_.reset(
new QuicFlowController(&connection_, stream_id_, Perspective::IS_CLIENT,
send_window_, receive_window_, false));
}
protected:
QuicStreamId stream_id_;
QuicByteCount send_window_;
QuicByteCount receive_window_;
scoped_ptr<QuicFlowController> flow_controller_;
MockConnection connection_;
};
TEST_F(QuicFlowControllerTest, SendingBytes) {
Initialize();
EXPECT_FALSE(flow_controller_->IsBlocked());
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(send_window_, flow_controller_->SendWindowSize());
// Send some bytes, but not enough to block.
flow_controller_->AddBytesSent(send_window_ / 2);
EXPECT_FALSE(flow_controller_->IsBlocked());
EXPECT_EQ(send_window_ / 2, flow_controller_->SendWindowSize());
// Send enough bytes to block.
flow_controller_->AddBytesSent(send_window_ / 2);
EXPECT_TRUE(flow_controller_->IsBlocked());
EXPECT_EQ(0u, flow_controller_->SendWindowSize());
// BLOCKED frame should get sent.
EXPECT_CALL(connection_, SendBlocked(stream_id_)).Times(1);
flow_controller_->MaybeSendBlocked();
// Update the send window, and verify this has unblocked.
EXPECT_TRUE(flow_controller_->UpdateSendWindowOffset(2 * send_window_));
EXPECT_FALSE(flow_controller_->IsBlocked());
EXPECT_EQ(send_window_, flow_controller_->SendWindowSize());
// Updating with a smaller offset doesn't change anything.
EXPECT_FALSE(flow_controller_->UpdateSendWindowOffset(send_window_ / 10));
EXPECT_EQ(send_window_, flow_controller_->SendWindowSize());
// Try to send more bytes, violating flow control.
EXPECT_CALL(connection_,
SendConnectionClose(QUIC_FLOW_CONTROL_SENT_TOO_MUCH_DATA));
EXPECT_DFATAL(
flow_controller_->AddBytesSent(send_window_ * 10),
base::StringPrintf("Trying to send an extra %" PRIu64 " bytes",
send_window_ * 10));
EXPECT_TRUE(flow_controller_->IsBlocked());
EXPECT_EQ(0u, flow_controller_->SendWindowSize());
}
TEST_F(QuicFlowControllerTest, ReceivingBytes) {
Initialize();
EXPECT_FALSE(flow_controller_->IsBlocked());
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(kInitialSessionFlowControlWindowForTest,
QuicFlowControllerPeer::ReceiveWindowSize(flow_controller_.get()));
// Receive some bytes, updating highest received offset, but not enough to
// fill flow control receive window.
EXPECT_TRUE(
flow_controller_->UpdateHighestReceivedOffset(1 + receive_window_ / 2));
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ((receive_window_ / 2) - 1,
QuicFlowControllerPeer::ReceiveWindowSize(flow_controller_.get()));
// Consume enough bytes to send a WINDOW_UPDATE frame.
EXPECT_CALL(connection_, SendWindowUpdate(stream_id_, ::testing::_)).Times(1);
flow_controller_->AddBytesConsumed(1 + receive_window_ / 2);
// Result is that once again we have a fully open receive window.
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(kInitialSessionFlowControlWindowForTest,
QuicFlowControllerPeer::ReceiveWindowSize(flow_controller_.get()));
}
TEST_F(QuicFlowControllerTest, OnlySendBlockedFrameOncePerOffset) {
Initialize();
// Test that we don't send duplicate BLOCKED frames. We should only send one
// BLOCKED frame at a given send window offset.
EXPECT_FALSE(flow_controller_->IsBlocked());
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(send_window_, flow_controller_->SendWindowSize());
// Send enough bytes to block.
flow_controller_->AddBytesSent(send_window_);
EXPECT_TRUE(flow_controller_->IsBlocked());
EXPECT_EQ(0u, flow_controller_->SendWindowSize());
// Expect that 2 BLOCKED frames should get sent in total.
EXPECT_CALL(connection_, SendBlocked(stream_id_)).Times(2);
// BLOCKED frame should get sent.
flow_controller_->MaybeSendBlocked();
// BLOCKED frame should not get sent again until our send offset changes.
flow_controller_->MaybeSendBlocked();
flow_controller_->MaybeSendBlocked();
flow_controller_->MaybeSendBlocked();
flow_controller_->MaybeSendBlocked();
flow_controller_->MaybeSendBlocked();
// Update the send window, then send enough bytes to block again.
EXPECT_TRUE(flow_controller_->UpdateSendWindowOffset(2 * send_window_));
EXPECT_FALSE(flow_controller_->IsBlocked());
EXPECT_EQ(send_window_, flow_controller_->SendWindowSize());
flow_controller_->AddBytesSent(send_window_);
EXPECT_TRUE(flow_controller_->IsBlocked());
EXPECT_EQ(0u, flow_controller_->SendWindowSize());
// BLOCKED frame should get sent as send offset has changed.
flow_controller_->MaybeSendBlocked();
}
TEST_F(QuicFlowControllerTest, ReceivingBytesFastIncreasesFlowWindow) {
ValueRestore<bool> old_flag(&FLAGS_quic_auto_tune_receive_window, true);
// This test will generate two WINDOW_UPDATE frames.
EXPECT_CALL(connection_, SendWindowUpdate(stream_id_, ::testing::_)).Times(2);
Initialize();
flow_controller_->set_auto_tune_receive_window(true);
// Make sure clock is inititialized.
connection_.AdvanceTime(QuicTime::Delta::FromMilliseconds(1));
QuicSentPacketManager* manager =
QuicConnectionPeer::GetSentPacketManager(&connection_);
RttStats* rtt_stats = QuicSentPacketManagerPeer::GetRttStats(manager);
rtt_stats->UpdateRtt(QuicTime::Delta::FromMilliseconds(kRtt),
QuicTime::Delta::Zero(), QuicTime::Zero());
EXPECT_FALSE(flow_controller_->IsBlocked());
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(kInitialSessionFlowControlWindowForTest,
QuicFlowControllerPeer::ReceiveWindowSize(flow_controller_.get()));
QuicByteCount threshold =
QuicFlowControllerPeer::WindowUpdateThreshold(flow_controller_.get());
QuicStreamOffset receive_offset = threshold + 1;
// Receive some bytes, updating highest received offset, but not enough to
// fill flow control receive window.
EXPECT_TRUE(flow_controller_->UpdateHighestReceivedOffset(receive_offset));
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(kInitialSessionFlowControlWindowForTest - receive_offset,
QuicFlowControllerPeer::ReceiveWindowSize(flow_controller_.get()));
// Consume enough bytes to send a WINDOW_UPDATE frame.
flow_controller_->AddBytesConsumed(threshold + 1);
// Result is that once again we have a fully open receive window.
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(kInitialSessionFlowControlWindowForTest,
QuicFlowControllerPeer::ReceiveWindowSize(flow_controller_.get()));
// Move time forward, but by less than two RTTs. Then receive and consume
// some more, forcing a second WINDOW_UPDATE with an increased max window
// size.
connection_.AdvanceTime(QuicTime::Delta::FromMilliseconds(2 * kRtt - 1));
receive_offset += threshold + 1;
EXPECT_TRUE(flow_controller_->UpdateHighestReceivedOffset(receive_offset));
flow_controller_->AddBytesConsumed(threshold + 1);
EXPECT_FALSE(flow_controller_->FlowControlViolation());
QuicByteCount new_threshold =
QuicFlowControllerPeer::WindowUpdateThreshold(flow_controller_.get());
EXPECT_GT(new_threshold, threshold);
}
TEST_F(QuicFlowControllerTest, ReceivingBytesFastStatusQuo) {
ValueRestore<bool> old_flag(&FLAGS_quic_auto_tune_receive_window, false);
// This test will generate two WINDOW_UPDATE frames.
EXPECT_CALL(connection_, SendWindowUpdate(stream_id_, ::testing::_)).Times(2);
Initialize();
flow_controller_->set_auto_tune_receive_window(true);
// Make sure clock is inititialized.
connection_.AdvanceTime(QuicTime::Delta::FromMilliseconds(1));
QuicSentPacketManager* manager =
QuicConnectionPeer::GetSentPacketManager(&connection_);
RttStats* rtt_stats = QuicSentPacketManagerPeer::GetRttStats(manager);
rtt_stats->UpdateRtt(QuicTime::Delta::FromMilliseconds(kRtt),
QuicTime::Delta::Zero(), QuicTime::Zero());
EXPECT_FALSE(flow_controller_->IsBlocked());
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(kInitialSessionFlowControlWindowForTest,
QuicFlowControllerPeer::ReceiveWindowSize(flow_controller_.get()));
QuicByteCount threshold =
QuicFlowControllerPeer::WindowUpdateThreshold(flow_controller_.get());
QuicStreamOffset receive_offset = threshold + 1;
// Receive some bytes, updating highest received offset, but not enough to
// fill flow control receive window.
EXPECT_TRUE(flow_controller_->UpdateHighestReceivedOffset(receive_offset));
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(kInitialSessionFlowControlWindowForTest - receive_offset,
QuicFlowControllerPeer::ReceiveWindowSize(flow_controller_.get()));
// Consume enough bytes to send a WINDOW_UPDATE frame.
flow_controller_->AddBytesConsumed(threshold + 1);
// Result is that once again we have a fully open receive window.
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(kInitialSessionFlowControlWindowForTest,
QuicFlowControllerPeer::ReceiveWindowSize(flow_controller_.get()));
// Move time forward, but by less than two RTTs. Then receive and consume
// some more, forcing a second WINDOW_UPDATE with an increased max window
// size.
connection_.AdvanceTime(QuicTime::Delta::FromMilliseconds(2 * kRtt - 1));
receive_offset += threshold + 1;
EXPECT_TRUE(flow_controller_->UpdateHighestReceivedOffset(receive_offset));
flow_controller_->AddBytesConsumed(threshold + 1);
EXPECT_FALSE(flow_controller_->FlowControlViolation());
QuicByteCount new_threshold =
QuicFlowControllerPeer::WindowUpdateThreshold(flow_controller_.get());
EXPECT_EQ(new_threshold, threshold);
}
TEST_F(QuicFlowControllerTest, ReceivingBytesNormalStableFlowWindow) {
ValueRestore<bool> old_flag(&FLAGS_quic_auto_tune_receive_window, true);
// This test will generate two WINDOW_UPDATE frames.
EXPECT_CALL(connection_, SendWindowUpdate(stream_id_, ::testing::_)).Times(2);
Initialize();
flow_controller_->set_auto_tune_receive_window(true);
// Make sure clock is inititialized.
connection_.AdvanceTime(QuicTime::Delta::FromMilliseconds(1));
QuicSentPacketManager* manager =
QuicConnectionPeer::GetSentPacketManager(&connection_);
RttStats* rtt_stats = QuicSentPacketManagerPeer::GetRttStats(manager);
rtt_stats->UpdateRtt(QuicTime::Delta::FromMilliseconds(kRtt),
QuicTime::Delta::Zero(), QuicTime::Zero());
EXPECT_FALSE(flow_controller_->IsBlocked());
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(kInitialSessionFlowControlWindowForTest,
QuicFlowControllerPeer::ReceiveWindowSize(flow_controller_.get()));
QuicByteCount threshold =
QuicFlowControllerPeer::WindowUpdateThreshold(flow_controller_.get());
QuicStreamOffset receive_offset = threshold + 1;
// Receive some bytes, updating highest received offset, but not enough to
// fill flow control receive window.
EXPECT_TRUE(flow_controller_->UpdateHighestReceivedOffset(receive_offset));
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(kInitialSessionFlowControlWindowForTest - receive_offset,
QuicFlowControllerPeer::ReceiveWindowSize(flow_controller_.get()));
flow_controller_->AddBytesConsumed(threshold + 1);
// Result is that once again we have a fully open receive window.
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(kInitialSessionFlowControlWindowForTest,
QuicFlowControllerPeer::ReceiveWindowSize(flow_controller_.get()));
// Move time forward, but by more than two RTTs. Then receive and consume
// some more, forcing a second WINDOW_UPDATE with unchanged max window size.
connection_.AdvanceTime(QuicTime::Delta::FromMilliseconds(2 * kRtt + 1));
receive_offset += threshold + 1;
EXPECT_TRUE(flow_controller_->UpdateHighestReceivedOffset(receive_offset));
flow_controller_->AddBytesConsumed(threshold + 1);
EXPECT_FALSE(flow_controller_->FlowControlViolation());
QuicByteCount new_threshold =
QuicFlowControllerPeer::WindowUpdateThreshold(flow_controller_.get());
EXPECT_EQ(new_threshold, threshold);
}
TEST_F(QuicFlowControllerTest, ReceivingBytesNormalStatusQuo) {
ValueRestore<bool> old_flag(&FLAGS_quic_auto_tune_receive_window, false);
// This test will generate two WINDOW_UPDATE frames.
EXPECT_CALL(connection_, SendWindowUpdate(stream_id_, ::testing::_)).Times(2);
Initialize();
flow_controller_->set_auto_tune_receive_window(true);
// Make sure clock is inititialized.
connection_.AdvanceTime(QuicTime::Delta::FromMilliseconds(1));
QuicSentPacketManager* manager =
QuicConnectionPeer::GetSentPacketManager(&connection_);
RttStats* rtt_stats = QuicSentPacketManagerPeer::GetRttStats(manager);
rtt_stats->UpdateRtt(QuicTime::Delta::FromMilliseconds(kRtt),
QuicTime::Delta::Zero(), QuicTime::Zero());
EXPECT_FALSE(flow_controller_->IsBlocked());
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(kInitialSessionFlowControlWindowForTest,
QuicFlowControllerPeer::ReceiveWindowSize(flow_controller_.get()));
QuicByteCount threshold =
QuicFlowControllerPeer::WindowUpdateThreshold(flow_controller_.get());
QuicStreamOffset receive_offset = threshold + 1;
// Receive some bytes, updating highest received offset, but not enough to
// fill flow control receive window.
EXPECT_TRUE(flow_controller_->UpdateHighestReceivedOffset(receive_offset));
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(kInitialSessionFlowControlWindowForTest - receive_offset,
QuicFlowControllerPeer::ReceiveWindowSize(flow_controller_.get()));
flow_controller_->AddBytesConsumed(threshold + 1);
// Result is that once again we have a fully open receive window.
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(kInitialSessionFlowControlWindowForTest,
QuicFlowControllerPeer::ReceiveWindowSize(flow_controller_.get()));
// Move time forward, but by more than two RTTs. Then receive and consume
// some more, forcing a second WINDOW_UPDATE with unchanged max window size.
connection_.AdvanceTime(QuicTime::Delta::FromMilliseconds(2 * kRtt + 1));
receive_offset += threshold + 1;
EXPECT_TRUE(flow_controller_->UpdateHighestReceivedOffset(receive_offset));
flow_controller_->AddBytesConsumed(threshold + 1);
EXPECT_FALSE(flow_controller_->FlowControlViolation());
QuicByteCount new_threshold =
QuicFlowControllerPeer::WindowUpdateThreshold(flow_controller_.get());
EXPECT_EQ(new_threshold, threshold);
}
} // namespace test
} // namespace net
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