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// Copyright (c) 2020 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 "quiche/quic/core/quic_network_blackhole_detector.h"
#include "quiche/quic/core/quic_one_block_arena.h"
#include "quiche/quic/platform/api/quic_test.h"
#include "quiche/quic/test_tools/quic_test_utils.h"
namespace quic {
namespace test {
class QuicNetworkBlackholeDetectorPeer {
public:
static QuicAlarm* GetAlarm(QuicNetworkBlackholeDetector* detector) {
return detector->alarm_.get();
}
};
namespace {
class MockDelegate : public QuicNetworkBlackholeDetector::Delegate {
public:
MOCK_METHOD(void, OnPathDegradingDetected, (), (override));
MOCK_METHOD(void, OnBlackholeDetected, (), (override));
MOCK_METHOD(void, OnPathMtuReductionDetected, (), (override));
};
const size_t kPathDegradingDelayInSeconds = 5;
const size_t kPathMtuReductionDelayInSeconds = 7;
const size_t kBlackholeDelayInSeconds = 10;
class QuicNetworkBlackholeDetectorTest : public QuicTest {
public:
QuicNetworkBlackholeDetectorTest()
: detector_(&delegate_, &arena_, &alarm_factory_, /*context=*/nullptr),
alarm_(static_cast<MockAlarmFactory::TestAlarm*>(
QuicNetworkBlackholeDetectorPeer::GetAlarm(&detector_))),
path_degrading_delay_(
QuicTime::Delta::FromSeconds(kPathDegradingDelayInSeconds)),
path_mtu_reduction_delay_(
QuicTime::Delta::FromSeconds(kPathMtuReductionDelayInSeconds)),
blackhole_delay_(
QuicTime::Delta::FromSeconds(kBlackholeDelayInSeconds)) {
clock_.AdvanceTime(QuicTime::Delta::FromSeconds(1));
}
protected:
void RestartDetection() {
detector_.RestartDetection(clock_.Now() + path_degrading_delay_,
clock_.Now() + blackhole_delay_,
clock_.Now() + path_mtu_reduction_delay_);
}
testing::StrictMock<MockDelegate> delegate_;
QuicConnectionArena arena_;
MockAlarmFactory alarm_factory_;
QuicNetworkBlackholeDetector detector_;
MockAlarmFactory::TestAlarm* alarm_;
MockClock clock_;
const QuicTime::Delta path_degrading_delay_;
const QuicTime::Delta path_mtu_reduction_delay_;
const QuicTime::Delta blackhole_delay_;
};
TEST_F(QuicNetworkBlackholeDetectorTest, StartAndFire) {
EXPECT_FALSE(detector_.IsDetectionInProgress());
RestartDetection();
EXPECT_TRUE(detector_.IsDetectionInProgress());
EXPECT_EQ(clock_.Now() + path_degrading_delay_, alarm_->deadline());
// Fire path degrading alarm.
clock_.AdvanceTime(path_degrading_delay_);
EXPECT_CALL(delegate_, OnPathDegradingDetected());
alarm_->Fire();
// Verify path mtu reduction detection is still in progress.
EXPECT_TRUE(detector_.IsDetectionInProgress());
EXPECT_EQ(clock_.Now() + path_mtu_reduction_delay_ - path_degrading_delay_,
alarm_->deadline());
// Fire path mtu reduction detection alarm.
clock_.AdvanceTime(path_mtu_reduction_delay_ - path_degrading_delay_);
EXPECT_CALL(delegate_, OnPathMtuReductionDetected());
alarm_->Fire();
// Verify blackhole detection is still in progress.
EXPECT_TRUE(detector_.IsDetectionInProgress());
EXPECT_EQ(clock_.Now() + blackhole_delay_ - path_mtu_reduction_delay_,
alarm_->deadline());
// Fire blackhole detection alarm.
clock_.AdvanceTime(blackhole_delay_ - path_mtu_reduction_delay_);
EXPECT_CALL(delegate_, OnBlackholeDetected());
alarm_->Fire();
EXPECT_FALSE(detector_.IsDetectionInProgress());
}
TEST_F(QuicNetworkBlackholeDetectorTest, RestartAndStop) {
RestartDetection();
clock_.AdvanceTime(QuicTime::Delta::FromSeconds(1));
RestartDetection();
EXPECT_EQ(clock_.Now() + path_degrading_delay_, alarm_->deadline());
detector_.StopDetection(/*permanent=*/false);
EXPECT_FALSE(detector_.IsDetectionInProgress());
}
TEST_F(QuicNetworkBlackholeDetectorTest, PathDegradingFiresAndRestart) {
EXPECT_FALSE(detector_.IsDetectionInProgress());
RestartDetection();
EXPECT_TRUE(detector_.IsDetectionInProgress());
EXPECT_EQ(clock_.Now() + path_degrading_delay_, alarm_->deadline());
// Fire path degrading alarm.
clock_.AdvanceTime(path_degrading_delay_);
EXPECT_CALL(delegate_, OnPathDegradingDetected());
alarm_->Fire();
// Verify path mtu reduction detection is still in progress.
EXPECT_TRUE(detector_.IsDetectionInProgress());
EXPECT_EQ(clock_.Now() + path_mtu_reduction_delay_ - path_degrading_delay_,
alarm_->deadline());
// After 100ms, restart detections on forward progress.
clock_.AdvanceTime(QuicTime::Delta::FromMilliseconds(100));
RestartDetection();
// Verify alarm is armed based on path degrading deadline.
EXPECT_EQ(clock_.Now() + path_degrading_delay_, alarm_->deadline());
}
} // namespace
} // namespace test
} // namespace quic
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