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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 "quic/core/quic_idle_network_detector.h"
#include "quic/core/quic_constants.h"
namespace quic {
namespace {
class AlarmDelegate : public QuicAlarm::Delegate {
public:
explicit AlarmDelegate(QuicIdleNetworkDetector* detector)
: detector_(detector) {}
AlarmDelegate(const AlarmDelegate&) = delete;
AlarmDelegate& operator=(const AlarmDelegate&) = delete;
void OnAlarm() override { detector_->OnAlarm(); }
private:
QuicIdleNetworkDetector* detector_;
};
} // namespace
QuicIdleNetworkDetector::QuicIdleNetworkDetector(
Delegate* delegate,
QuicTime now,
QuicConnectionArena* arena,
QuicAlarmFactory* alarm_factory)
: delegate_(delegate),
start_time_(now),
handshake_timeout_(QuicTime::Delta::Infinite()),
time_of_last_received_packet_(now),
time_of_first_packet_sent_after_receiving_(QuicTime::Zero()),
idle_network_timeout_(QuicTime::Delta::Infinite()),
alarm_(
alarm_factory->CreateAlarm(arena->New<AlarmDelegate>(this), arena)) {}
void QuicIdleNetworkDetector::OnAlarm() {
if (handshake_timeout_.IsInfinite()) {
delegate_->OnIdleNetworkDetected();
return;
}
if (idle_network_timeout_.IsInfinite()) {
delegate_->OnHandshakeTimeout();
return;
}
if (last_network_activity_time() + idle_network_timeout_ >
start_time_ + handshake_timeout_) {
delegate_->OnHandshakeTimeout();
return;
}
delegate_->OnIdleNetworkDetected();
}
void QuicIdleNetworkDetector::SetTimeouts(
QuicTime::Delta handshake_timeout,
QuicTime::Delta idle_network_timeout) {
handshake_timeout_ = handshake_timeout;
idle_network_timeout_ = idle_network_timeout;
SetAlarm();
}
void QuicIdleNetworkDetector::StopDetection() {
alarm_->Cancel();
handshake_timeout_ = QuicTime::Delta::Infinite();
idle_network_timeout_ = QuicTime::Delta::Infinite();
}
void QuicIdleNetworkDetector::OnPacketSent(QuicTime now,
QuicTime::Delta pto_delay) {
if (time_of_first_packet_sent_after_receiving_ >
time_of_last_received_packet_) {
return;
}
time_of_first_packet_sent_after_receiving_ =
std::max(time_of_first_packet_sent_after_receiving_, now);
if (shorter_idle_timeout_on_sent_packet_) {
MaybeSetAlarmOnSentPacket(pto_delay);
return;
}
SetAlarm();
}
void QuicIdleNetworkDetector::OnPacketReceived(QuicTime now) {
time_of_last_received_packet_ = std::max(time_of_last_received_packet_, now);
SetAlarm();
}
void QuicIdleNetworkDetector::SetAlarm() {
// Set alarm to the nearer deadline.
QuicTime new_deadline = QuicTime::Zero();
if (!handshake_timeout_.IsInfinite()) {
new_deadline = start_time_ + handshake_timeout_;
}
if (!idle_network_timeout_.IsInfinite()) {
const QuicTime idle_network_deadline = GetIdleNetworkDeadline();
if (new_deadline.IsInitialized()) {
new_deadline = std::min(new_deadline, idle_network_deadline);
} else {
new_deadline = idle_network_deadline;
}
}
alarm_->Update(new_deadline, kAlarmGranularity);
}
void QuicIdleNetworkDetector::MaybeSetAlarmOnSentPacket(
QuicTime::Delta pto_delay) {
QUICHE_DCHECK(shorter_idle_timeout_on_sent_packet_);
if (!handshake_timeout_.IsInfinite() || !alarm_->IsSet()) {
SetAlarm();
return;
}
// Make sure connection will be alive for another PTO.
const QuicTime deadline = alarm_->deadline();
const QuicTime min_deadline = last_network_activity_time() + pto_delay;
if (deadline > min_deadline) {
return;
}
alarm_->Update(min_deadline, kAlarmGranularity);
}
QuicTime QuicIdleNetworkDetector::GetIdleNetworkDeadline() const {
if (idle_network_timeout_.IsInfinite()) {
return QuicTime::Zero();
}
return last_network_activity_time() + idle_network_timeout_;
}
} // namespace quic
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