| // Copyright 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 "remoting/host/zombie_host_detector.h" |
| |
| #include "base/check.h" |
| #include "base/logging.h" |
| #include "net/base/network_change_notifier.h" |
| |
| namespace { |
| |
| bool IsMaxDurationExceeded(base::TimeTicks event_time, |
| base::TimeDelta max_duration, |
| const std::string& event_name) { |
| if (event_time.is_null()) { |
| VLOG(1) << "Last " << event_name << " is null."; |
| return false; |
| } |
| base::TimeDelta event_duration = base::TimeTicks::Now() - event_time; |
| DCHECK_GE(event_duration, base::TimeDelta()) << "Event duration is negative."; |
| bool is_exceeded = event_duration > max_duration; |
| if (is_exceeded) { |
| LOG(ERROR) << "Last " << event_name << " happened " << event_duration |
| << " ago, exceeding max duration of " << max_duration; |
| } else { |
| VLOG(1) << "Last " << event_name << " happened " << event_duration |
| << " ago."; |
| } |
| return is_exceeded; |
| } |
| |
| } // namespace |
| |
| namespace remoting { |
| |
| // static |
| constexpr base::TimeDelta ZombieHostDetector::kZombieStateDetectionInterval; |
| constexpr base::TimeDelta ZombieHostDetector::kMaxHeartbeatInterval; |
| constexpr base::TimeDelta ZombieHostDetector::kMaxSignalingActiveInterval; |
| |
| ZombieHostDetector::ZombieHostDetector( |
| base::OnceClosure on_zombie_state_detected) { |
| DCHECK(on_zombie_state_detected); |
| |
| on_zombie_state_detected_ = std::move(on_zombie_state_detected); |
| } |
| |
| ZombieHostDetector::~ZombieHostDetector() = default; |
| |
| void ZombieHostDetector::Start() { |
| check_zombie_state_timer_.Start(FROM_HERE, kZombieStateDetectionInterval, |
| this, &ZombieHostDetector::CheckZombieState); |
| } |
| |
| void ZombieHostDetector::OnHeartbeatSent() { |
| last_heartbeat_time_ = base::TimeTicks::Now(); |
| } |
| |
| void ZombieHostDetector::OnSignalingActive() { |
| last_signaling_active_time_ = base::TimeTicks::Now(); |
| } |
| |
| base::TimeTicks ZombieHostDetector::GetNextDetectionTime() const { |
| return check_zombie_state_timer_.desired_run_time(); |
| } |
| |
| void ZombieHostDetector::CheckZombieState() { |
| VLOG(1) << "Detecting zombie state..."; |
| |
| if (net::NetworkChangeNotifier::GetConnectionType() == |
| net::NetworkChangeNotifier::CONNECTION_NONE) { |
| // The host shouldn't be considered in zombie state if it has no connection. |
| VLOG(1) << "No internet connectivity. Skipping zombie state check..."; |
| previously_offline_ = true; |
| return; |
| } |
| |
| if (previously_offline_) { |
| // If the host was previously offline, heartbeat/signaling might not have |
| // happened at this point due to backoff. Reset them to |now| to allow them |
| // to come through. |
| |
| previously_offline_ = false; |
| |
| VLOG(1) << "Host is going online. Previous heartbeat time: " |
| << last_heartbeat_time_ << ", previous signaling active time: " |
| << last_signaling_active_time_ << ". These will be reset to |now|."; |
| |
| // Don't reset if they are null, which happens when the first |
| // heartbeat/signaling attempt has not succeeded yet. |
| if (!last_heartbeat_time_.is_null()) { |
| OnHeartbeatSent(); |
| } |
| if (!last_signaling_active_time_.is_null()) { |
| OnSignalingActive(); |
| } |
| return; |
| } |
| |
| if (IsMaxDurationExceeded(last_heartbeat_time_, kMaxHeartbeatInterval, |
| "heartbeat") || |
| IsMaxDurationExceeded(last_signaling_active_time_, |
| kMaxSignalingActiveInterval, |
| "signaling activity")) { |
| LOG(ERROR) << "Host zombie state detected."; |
| check_zombie_state_timer_.Stop(); |
| std::move(on_zombie_state_detected_).Run(); |
| return; |
| } |
| |
| VLOG(1) << "No zombie state detected."; |
| } |
| |
| } // namespace remoting |