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/*
* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef NET_DCSCTP_TIMER_FAKE_TIMEOUT_H_
#define NET_DCSCTP_TIMER_FAKE_TIMEOUT_H_
#include <cstdint>
#include <functional>
#include <limits>
#include <memory>
#include <utility>
#include <vector>
#include "absl/types/optional.h"
#include "api/task_queue/task_queue_base.h"
#include "api/units/timestamp.h"
#include "net/dcsctp/public/timeout.h"
#include "net/dcsctp/public/types.h"
#include "rtc_base/checks.h"
#include "rtc_base/containers/flat_set.h"
namespace dcsctp {
// A timeout used in tests.
class FakeTimeout : public Timeout {
public:
FakeTimeout(std::function<webrtc::Timestamp()> get_time,
std::function<void(FakeTimeout*)> on_delete)
: get_time_(std::move(get_time)), on_delete_(std::move(on_delete)) {}
~FakeTimeout() override { on_delete_(this); }
void Start(DurationMs duration_ms, TimeoutID timeout_id) override {
RTC_DCHECK(expiry_.IsPlusInfinity());
timeout_id_ = timeout_id;
expiry_ = get_time_() + duration_ms.ToTimeDelta();
}
void Stop() override {
RTC_DCHECK(!expiry_.IsPlusInfinity());
expiry_ = webrtc::Timestamp::PlusInfinity();
}
bool EvaluateHasExpired(webrtc::Timestamp now) {
if (now >= expiry_) {
expiry_ = webrtc::Timestamp::PlusInfinity();
return true;
}
return false;
}
TimeoutID timeout_id() const { return timeout_id_; }
webrtc::Timestamp expiry() const { return expiry_; }
private:
const std::function<webrtc::Timestamp()> get_time_;
const std::function<void(FakeTimeout*)> on_delete_;
TimeoutID timeout_id_ = TimeoutID(0);
webrtc::Timestamp expiry_ = webrtc::Timestamp::PlusInfinity();
};
class FakeTimeoutManager {
public:
// The `get_time` function must return the current time, relative to any
// epoch.
explicit FakeTimeoutManager(std::function<webrtc::Timestamp()> get_time)
: get_time_(std::move(get_time)) {}
std::unique_ptr<FakeTimeout> CreateTimeout() {
auto timer = std::make_unique<FakeTimeout>(
get_time_, [this](FakeTimeout* timer) { timers_.erase(timer); });
timers_.insert(timer.get());
return timer;
}
std::unique_ptr<FakeTimeout> CreateTimeout(
webrtc::TaskQueueBase::DelayPrecision precision) {
// FakeTimeout does not support implement |precision|.
return CreateTimeout();
}
// NOTE: This can't return a vector, as calling EvaluateHasExpired requires
// calling socket->HandleTimeout directly afterwards, as the owning Timer
// still believes it's running, and it needs to be updated to set
// Timer::is_running_ to false before you operate on the Timer or Timeout
// again.
absl::optional<TimeoutID> GetNextExpiredTimeout() {
webrtc::Timestamp now = get_time_();
std::vector<TimeoutID> expired_timers;
for (auto& timer : timers_) {
if (timer->EvaluateHasExpired(now)) {
return timer->timeout_id();
}
}
return absl::nullopt;
}
webrtc::TimeDelta GetTimeToNextTimeout() const {
webrtc::Timestamp next_expiry = webrtc::Timestamp::PlusInfinity();
for (const FakeTimeout* timer : timers_) {
if (timer->expiry() < next_expiry) {
next_expiry = timer->expiry();
}
}
webrtc::Timestamp now = get_time_();
return !next_expiry.IsPlusInfinity() && next_expiry >= now
? next_expiry - now
: webrtc::TimeDelta::PlusInfinity();
}
private:
const std::function<webrtc::Timestamp()> get_time_;
webrtc::flat_set<FakeTimeout*> timers_;
};
} // namespace dcsctp
#endif // NET_DCSCTP_TIMER_FAKE_TIMEOUT_H_