blob: 105ad480760365635b2be1a1ed7c8334dc47684d [file] [log] [blame]
/*
* Copyright (c) 2019 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/scenario/network/cross_traffic.h"
#include <math.h>
#include <utility>
#include "absl/memory/memory.h"
#include "absl/types/optional.h"
#include "rtc_base/logging.h"
#include "rtc_base/numerics/safe_minmax.h"
namespace webrtc {
namespace test {
RandomWalkCrossTraffic::RandomWalkCrossTraffic(RandomWalkConfig config,
TrafficRoute* traffic_route)
: config_(config),
traffic_route_(traffic_route),
random_(config_.random_seed) {
sequence_checker_.Detach();
}
RandomWalkCrossTraffic::~RandomWalkCrossTraffic() = default;
void RandomWalkCrossTraffic::Process(Timestamp at_time) {
RTC_DCHECK_RUN_ON(&sequence_checker_);
if (last_process_time_.IsMinusInfinity()) {
last_process_time_ = at_time;
}
TimeDelta delta = at_time - last_process_time_;
last_process_time_ = at_time;
if (at_time - last_update_time_ >= config_.update_interval) {
intensity_ += random_.Gaussian(config_.bias, config_.variance) *
sqrt((at_time - last_update_time_).seconds<double>());
intensity_ = rtc::SafeClamp(intensity_, 0.0, 1.0);
last_update_time_ = at_time;
}
pending_size_ += TrafficRate() * delta;
if (pending_size_ >= config_.min_packet_size &&
at_time >= last_send_time_ + config_.min_packet_interval) {
traffic_route_->SendPacket(pending_size_.bytes());
pending_size_ = DataSize::Zero();
last_send_time_ = at_time;
}
}
DataRate RandomWalkCrossTraffic::TrafficRate() const {
RTC_DCHECK_RUN_ON(&sequence_checker_);
return config_.peak_rate * intensity_;
}
ColumnPrinter RandomWalkCrossTraffic::StatsPrinter() {
return ColumnPrinter::Lambda(
"random_walk_cross_traffic_rate",
[this](rtc::SimpleStringBuilder& sb) {
sb.AppendFormat("%.0lf", TrafficRate().bps() / 8.0);
},
32);
}
PulsedPeaksCrossTraffic::PulsedPeaksCrossTraffic(PulsedPeaksConfig config,
TrafficRoute* traffic_route)
: config_(config), traffic_route_(traffic_route) {
sequence_checker_.Detach();
}
PulsedPeaksCrossTraffic::~PulsedPeaksCrossTraffic() = default;
void PulsedPeaksCrossTraffic::Process(Timestamp at_time) {
RTC_DCHECK_RUN_ON(&sequence_checker_);
TimeDelta time_since_toggle = at_time - last_update_time_;
if (time_since_toggle.IsInfinite() ||
(sending_ && time_since_toggle >= config_.send_duration)) {
sending_ = false;
last_update_time_ = at_time;
} else if (!sending_ && time_since_toggle >= config_.hold_duration) {
sending_ = true;
last_update_time_ = at_time;
// Start sending period.
last_send_time_ = at_time;
}
if (sending_) {
DataSize pending_size = config_.peak_rate * (at_time - last_send_time_);
if (pending_size >= config_.min_packet_size &&
at_time >= last_send_time_ + config_.min_packet_interval) {
traffic_route_->SendPacket(pending_size.bytes());
last_send_time_ = at_time;
}
}
}
DataRate PulsedPeaksCrossTraffic::TrafficRate() const {
RTC_DCHECK_RUN_ON(&sequence_checker_);
return sending_ ? config_.peak_rate : DataRate::Zero();
}
ColumnPrinter PulsedPeaksCrossTraffic::StatsPrinter() {
return ColumnPrinter::Lambda(
"pulsed_peaks_cross_traffic_rate",
[this](rtc::SimpleStringBuilder& sb) {
sb.AppendFormat("%.0lf", TrafficRate().bps() / 8.0);
},
32);
}
FakeTcpCrossTraffic::FakeTcpCrossTraffic(FakeTcpConfig config,
EmulatedRoute* send_route,
EmulatedRoute* ret_route)
: conf_(config), route_(this, send_route, ret_route) {}
void FakeTcpCrossTraffic::Process(Timestamp at_time) {
SendPackets(at_time);
}
void FakeTcpCrossTraffic::OnRequest(int sequence_number, Timestamp at_time) {
const size_t kAckPacketSize = 20;
route_.SendResponse(kAckPacketSize, sequence_number);
}
void FakeTcpCrossTraffic::OnResponse(int sequence_number, Timestamp at_time) {
ack_received_ = true;
auto it = in_flight_.find(sequence_number);
if (it != in_flight_.end()) {
last_rtt_ = at_time - in_flight_.at(sequence_number);
in_flight_.erase(sequence_number);
}
if (sequence_number - last_acked_seq_num_ > 1) {
HandleLoss(at_time);
} else if (cwnd_ <= ssthresh_) {
cwnd_ += 1;
} else {
cwnd_ += 1.0f / cwnd_;
}
last_acked_seq_num_ = std::max(sequence_number, last_acked_seq_num_);
SendPackets(at_time);
}
void FakeTcpCrossTraffic::HandleLoss(Timestamp at_time) {
if (at_time - last_reduction_time_ < last_rtt_)
return;
last_reduction_time_ = at_time;
ssthresh_ = std::max(static_cast<int>(in_flight_.size() / 2), 2);
cwnd_ = ssthresh_;
}
void FakeTcpCrossTraffic::SendPackets(Timestamp at_time) {
int cwnd = std::ceil(cwnd_);
int packets_to_send = std::max(cwnd - static_cast<int>(in_flight_.size()), 0);
bool timeouts = false;
for (auto it = in_flight_.begin(); it != in_flight_.end();) {
if (it->second < at_time - conf_.packet_timeout) {
it = in_flight_.erase(it);
timeouts = true;
} else {
++it;
}
}
if (timeouts)
HandleLoss(at_time);
for (int i = 0; i < packets_to_send; ++i) {
if ((total_sent_ + conf_.packet_size) > conf_.send_limit) {
break;
}
in_flight_.insert({next_sequence_number_, at_time});
route_.SendRequest(conf_.packet_size.bytes<size_t>(),
next_sequence_number_++);
total_sent_ += conf_.packet_size;
}
}
} // namespace test
} // namespace webrtc