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/*
* Copyright (c) 2024 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.
*/
#include "test/network/schedulable_network_behavior.h"
#include <algorithm>
#include <cstdint>
#include <utility>
#include "absl/functional/any_invocable.h"
#include "api/sequence_checker.h"
#include "api/task_queue/task_queue_base.h"
#include "api/test/network_emulation/network_config_schedule.pb.h"
#include "api/test/simulated_network.h"
#include "api/units/data_rate.h"
#include "api/units/time_delta.h"
#include "api/units/timestamp.h"
#include "rtc_base/checks.h"
#include "rtc_base/task_utils/repeating_task.h"
#include "system_wrappers/include/clock.h"
#include "test/network/simulated_network.h"
namespace webrtc {
namespace {
void UpdateConfigFromSchedule(
const network_behaviour::NetworkConfigScheduleItem& schedule_item,
BuiltInNetworkBehaviorConfig& config) {
if (schedule_item.has_queue_length_packets()) {
config.queue_length_packets = schedule_item.queue_length_packets();
}
if (schedule_item.has_queue_delay_ms()) {
config.queue_delay_ms = schedule_item.queue_delay_ms();
}
if (schedule_item.has_link_capacity_kbps()) {
config.link_capacity =
DataRate::KilobitsPerSec(schedule_item.link_capacity_kbps());
}
if (schedule_item.has_loss_percent()) {
config.loss_percent = schedule_item.loss_percent();
}
if (schedule_item.has_delay_standard_deviation_ms()) {
config.delay_standard_deviation_ms =
schedule_item.delay_standard_deviation_ms();
}
if (schedule_item.has_allow_reordering()) {
config.allow_reordering = schedule_item.allow_reordering();
}
if (schedule_item.has_avg_burst_loss_length()) {
config.avg_burst_loss_length = schedule_item.avg_burst_loss_length();
}
if (schedule_item.has_packet_overhead()) {
config.packet_overhead = schedule_item.packet_overhead();
}
}
BuiltInNetworkBehaviorConfig GetInitialConfig(
const network_behaviour::NetworkConfigSchedule& schedule) {
BuiltInNetworkBehaviorConfig config;
if (!schedule.item().empty()) {
UpdateConfigFromSchedule(schedule.item(0), config);
}
return config;
}
} // namespace
SchedulableNetworkBehavior::SchedulableNetworkBehavior(
network_behaviour::NetworkConfigSchedule schedule,
uint64_t random_seed,
Clock& clock,
absl::AnyInvocable<bool(Timestamp)> start_callback)
: SimulatedNetwork(GetInitialConfig(schedule), random_seed),
schedule_(std::move(schedule)),
start_condition_(std::move(start_callback)),
clock_(clock),
config_(GetInitialConfig(schedule_)) {
if (schedule_.item().size() > 1) {
next_schedule_index_ = 1;
}
sequence_checker_.Detach();
}
bool SchedulableNetworkBehavior::EnqueuePacket(PacketInFlightInfo packet_info) {
RTC_DCHECK_RUN_ON(&sequence_checker_);
if (first_send_time_.IsInfinite() &&
start_condition_(Timestamp::Micros(packet_info.send_time_us))) {
first_send_time_ = Timestamp::Micros(packet_info.send_time_us);
if (schedule_.item().size() > 1) {
RTC_CHECK_LT(next_schedule_index_, schedule_.item().size());
TimeDelta delay =
TimeDelta::Millis(schedule_.item()[next_schedule_index_]
.time_since_first_sent_packet_ms());
schedule_task_ = RepeatingTaskHandle::DelayedStart(
TaskQueueBase::Current(), delay,
[this] { return UpdateConfigAndReschedule(); });
}
}
return SimulatedNetwork::EnqueuePacket(packet_info);
}
TimeDelta SchedulableNetworkBehavior::UpdateConfigAndReschedule() {
RTC_DCHECK_RUN_ON(&sequence_checker_);
Timestamp reschedule_time = clock_.CurrentTime();
RTC_CHECK_LT(next_schedule_index_, schedule_.item().size());
auto next_config = schedule_.item()[next_schedule_index_];
UpdateConfigFromSchedule(next_config, config_);
SimulatedNetwork::SetConfig(config_, reschedule_time);
next_schedule_index_ = ++next_schedule_index_ % schedule_.item().size();
TimeDelta delay = TimeDelta::Zero();
TimeDelta time_since_first_sent_packet = reschedule_time - first_send_time_;
if (next_schedule_index_ != 0) {
delay = std::max(TimeDelta::Millis(schedule_.item()[next_schedule_index_]
.time_since_first_sent_packet_ms()) -
(time_since_first_sent_packet - wrap_time_delta_),
TimeDelta::Zero());
} else if (!schedule_.has_repeat_schedule_after_last_ms()) {
// No more schedule items.
schedule_task_.Stop();
return TimeDelta::Zero(); // This is ignored.
} else {
// Wrap around to the first schedule item.
wrap_time_delta_ +=
TimeDelta::Millis(schedule_.repeat_schedule_after_last_ms()) +
TimeDelta::Millis(schedule_.item()[schedule_.item().size() - 1]
.time_since_first_sent_packet_ms());
delay = TimeDelta::Millis(schedule_.repeat_schedule_after_last_ms());
RTC_DCHECK_GE(delay, TimeDelta::Zero());
}
return delay;
}
} // namespace webrtc
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