Repo created

TMessagesProj/jni/voip/webrtc/net/dcsctp/timer/fake_timeout.h

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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_