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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/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_test_utils.h"
#include "net/test/gtest_util.h"
#include "testing/gmock/include/gmock/gmock.h"
using base::StringPrintf;
namespace net {
namespace test {
using ::testing::_;
class QuicFlowControllerTest : public ::testing::Test {
public:
QuicFlowControllerTest()
: stream_id_(1234),
send_window_(kInitialFlowControlWindowForTest),
receive_window_(kInitialFlowControlWindowForTest),
max_receive_window_(kInitialFlowControlWindowForTest),
connection_(false),
old_flag_(&FLAGS_enable_quic_stream_flow_control_2, true) {
}
void Initialize() {
flow_controller_.reset(new QuicFlowController(
&connection_, stream_id_, false, send_window_,
receive_window_, max_receive_window_));
}
protected:
QuicStreamId stream_id_;
uint64 send_window_;
uint64 receive_window_;
uint64 max_receive_window_;
scoped_ptr<QuicFlowController> flow_controller_;
MockConnection connection_;
ValueRestore<bool> old_flag_;
};
TEST_F(QuicFlowControllerTest, SendingBytes) {
Initialize();
EXPECT_TRUE(flow_controller_->IsEnabled());
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),
StringPrintf("Trying to send an extra %d bytes",
static_cast<int>(send_window_ * 10)));
EXPECT_TRUE(flow_controller_->IsBlocked());
EXPECT_EQ(0u, flow_controller_->SendWindowSize());
}
TEST_F(QuicFlowControllerTest, ReceivingBytes) {
Initialize();
EXPECT_TRUE(flow_controller_->IsEnabled());
EXPECT_FALSE(flow_controller_->IsBlocked());
EXPECT_FALSE(flow_controller_->FlowControlViolation());
EXPECT_EQ(kInitialFlowControlWindowForTest,
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_, _)).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(kInitialFlowControlWindowForTest,
QuicFlowControllerPeer::ReceiveWindowSize(flow_controller_.get()));
}
TEST_F(QuicFlowControllerTest,
DisabledWhenQuicVersionDoesNotSupportFlowControl) {
// Only support version 16: no flow control.
QuicVersionVector supported_versions;
supported_versions.push_back(QUIC_VERSION_16);
QuicConnectionPeer::SetSupportedVersions(&connection_, supported_versions);
Initialize();
MockConnection connection(false);
// Should not be enabled, and should not report as blocked.
EXPECT_FALSE(flow_controller_->IsEnabled());
EXPECT_FALSE(flow_controller_->IsBlocked());
EXPECT_FALSE(flow_controller_->FlowControlViolation());
// Any attempts to add/remove bytes should have no effect.
EXPECT_EQ(send_window_, flow_controller_->SendWindowSize());
EXPECT_EQ(send_window_,
QuicFlowControllerPeer::SendWindowOffset(flow_controller_.get()));
EXPECT_EQ(receive_window_, QuicFlowControllerPeer::ReceiveWindowOffset(
flow_controller_.get()));
flow_controller_->AddBytesSent(123);
flow_controller_->AddBytesConsumed(456);
flow_controller_->UpdateHighestReceivedOffset(789);
EXPECT_EQ(send_window_, flow_controller_->SendWindowSize());
EXPECT_EQ(send_window_,
QuicFlowControllerPeer::SendWindowOffset(flow_controller_.get()));
EXPECT_EQ(receive_window_, QuicFlowControllerPeer::ReceiveWindowOffset(
flow_controller_.get()));
// Any attempt to change offset should have no effect.
EXPECT_EQ(send_window_, flow_controller_->SendWindowSize());
EXPECT_EQ(send_window_,
QuicFlowControllerPeer::SendWindowOffset(flow_controller_.get()));
flow_controller_->UpdateSendWindowOffset(send_window_ + 12345);
EXPECT_EQ(send_window_, flow_controller_->SendWindowSize());
EXPECT_EQ(send_window_,
QuicFlowControllerPeer::SendWindowOffset(flow_controller_.get()));
// The connection should never send WINDOW_UPDATE or BLOCKED frames, even if
// the internal state implies that it should.
// If the flow controller was enabled, then a send window size of 0 would
// trigger a BLOCKED frame to be sent.
EXPECT_EQ(send_window_, flow_controller_->SendWindowSize());
EXPECT_CALL(connection_, SendBlocked(_)).Times(0);
flow_controller_->MaybeSendBlocked();
// If the flow controller was enabled, then a WINDOW_UPDATE would be sent if
// (receive window) < (max receive window / 2)
QuicFlowControllerPeer::SetReceiveWindowOffset(flow_controller_.get(),
max_receive_window_ / 10);
EXPECT_TRUE(QuicFlowControllerPeer::ReceiveWindowSize(
flow_controller_.get()) < (max_receive_window_ / 2));
EXPECT_CALL(connection_, SendWindowUpdate(_, _)).Times(0);
flow_controller_->AddBytesConsumed(0);
// Should not be enabled, and should not report as blocked.
EXPECT_FALSE(flow_controller_->IsEnabled());
EXPECT_FALSE(flow_controller_->IsBlocked());
EXPECT_FALSE(flow_controller_->FlowControlViolation());
}
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_TRUE(flow_controller_->IsEnabled());
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();
}
} // namespace test
} // namespace net
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