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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.
#ifndef QUICHE_QUIC_CORE_QUIC_NETWORK_BLACKHOLE_DETECTOR_H_
#define QUICHE_QUIC_CORE_QUIC_NETWORK_BLACKHOLE_DETECTOR_H_
#include "quic/core/quic_alarm.h"
#include "quic/core/quic_alarm_factory.h"
#include "quic/core/quic_one_block_arena.h"
#include "quic/core/quic_time.h"
#include "quic/platform/api/quic_export.h"
#include "quic/platform/api/quic_flags.h"
namespace quic {
namespace test {
class QuicConnectionPeer;
class QuicNetworkBlackholeDetectorPeer;
} // namespace test
// QuicNetworkBlackholeDetector can detect path degrading and/or network
// blackhole. If both detections are in progress, detector will be in path
// degrading detection mode. After reporting path degrading detected, detector
// switches to blackhole detection mode. So blackhole detection deadline must
// be later than path degrading deadline.
class QUIC_EXPORT_PRIVATE QuicNetworkBlackholeDetector {
public:
class QUIC_EXPORT_PRIVATE Delegate {
public:
virtual ~Delegate() {}
// Called when the path degrading alarm fires.
virtual void OnPathDegradingDetected() = 0;
// Called when the path blackhole alarm fires.
virtual void OnBlackholeDetected() = 0;
// Called when the path mtu reduction alarm fires.
virtual void OnPathMtuReductionDetected() = 0;
};
QuicNetworkBlackholeDetector(Delegate* delegate,
QuicConnectionArena* arena,
QuicAlarmFactory* alarm_factory);
// Called to stop all detections.
void StopDetection();
// Called to restart path degrading, path mtu reduction and blackhole
// detections. Please note, if |blackhole_deadline| is set, it must be the
// furthest in the future of all deadlines.
void RestartDetection(QuicTime path_degrading_deadline,
QuicTime blackhole_deadline,
QuicTime path_mtu_reduction_deadline);
// Called when |alarm_| fires.
void OnAlarm();
// Returns true if |alarm_| is set.
bool IsDetectionInProgress() const;
private:
friend class test::QuicConnectionPeer;
friend class test::QuicNetworkBlackholeDetectorPeer;
QuicTime GetEarliestDeadline() const;
QuicTime GetLastDeadline() const;
// Update alarm to the next deadline.
void UpdateAlarm() const;
Delegate* delegate_; // Not owned.
// Time that Delegate::OnPathDegrading will be called. 0 means no path
// degrading detection is in progress.
QuicTime path_degrading_deadline_ = QuicTime::Zero();
// Time that Delegate::OnBlackholeDetected will be called. 0 means no
// blackhole detection is in progress.
QuicTime blackhole_deadline_ = QuicTime::Zero();
// Time that Delegate::OnPathMtuReductionDetected will be called. 0 means no
// path mtu reduction detection is in progress.
QuicTime path_mtu_reduction_deadline_ = QuicTime::Zero();
QuicArenaScopedPtr<QuicAlarm> alarm_;
};
} // namespace quic
#endif // QUICHE_QUIC_CORE_QUIC_NETWORK_BLACKHOLE_DETECTOR_H_
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