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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_HOST_ZOMBIE_HOST_DETECTOR_H_
#define REMOTING_HOST_ZOMBIE_HOST_DETECTOR_H_
#include "base/functional/callback.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "remoting/host/heartbeat_sender.h"
#include "remoting/signaling/signaling_tracker.h"
namespace remoting {
// Helper class to detect if the host has entered a zombie state, where the host
// process is still running and has internet connection, but the host appears to
// be offline, or isn't reachable through signaling.
class ZombieHostDetector final : public HeartbeatSender::Observer,
public SignalingTracker {
public:
static constexpr base::TimeDelta kZombieStateDetectionInterval =
base::Minutes(5);
static constexpr base::TimeDelta kMaxHeartbeatInterval = base::Minutes(15);
static constexpr base::TimeDelta kMaxSignalingActiveInterval =
base::Minutes(1);
explicit ZombieHostDetector(base::OnceClosure on_zombie_state_detected);
~ZombieHostDetector() override;
ZombieHostDetector(const ZombieHostDetector&) = delete;
ZombieHostDetector& operator=(const ZombieHostDetector&) = delete;
// Start monitoring zombie state.
void Start();
// HeartbeatSender::Observer implementations.
void OnHeartbeatSent() override;
// SignalingTracker implementations.
void OnSignalingActive() override;
base::TimeTicks GetNextDetectionTime() const;
private:
void CheckZombieState();
base::OnceClosure on_zombie_state_detected_;
base::RepeatingTimer check_zombie_state_timer_;
base::TimeTicks last_heartbeat_time_;
base::TimeTicks last_signaling_active_time_;
bool previously_offline_ = false;
};
} // namespace remoting
#endif // REMOTING_HOST_ZOMBIE_HOST_DETECTOR_H_
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