blob: cbf09876ebf120b2615bd53ed52a19b255637620 [file] [log] [blame]
/*
* Copyright (c) 2018 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 "modules/congestion_controller/bbr/bbr_network_controller.h"
#include <algorithm>
#include <memory>
#include "modules/congestion_controller/bbr/bbr_factory.h"
#include "test/gmock.h"
#include "test/gtest.h"
#include "test/scenario/scenario.h"
using ::testing::_;
using ::testing::AllOf;
using ::testing::Field;
using ::testing::Ge;
using ::testing::Le;
using ::testing::Matcher;
using ::testing::NiceMock;
using ::testing::Property;
using ::testing::StrictMock;
namespace webrtc {
namespace test {
namespace {
const DataRate kInitialBitrate = DataRate::KilobitsPerSec(60);
const Timestamp kDefaultStartTime = Timestamp::Millis(10000000);
constexpr double kDataRateMargin = 0.3;
constexpr double kMinDataRateFactor = 1 - kDataRateMargin;
constexpr double kMaxDataRateFactor = 1 + kDataRateMargin;
inline Matcher<TargetTransferRate> TargetRateCloseTo(DataRate rate) {
DataRate min_data_rate = rate * kMinDataRateFactor;
DataRate max_data_rate = rate * kMaxDataRateFactor;
return Field(&TargetTransferRate::target_rate,
AllOf(Ge(min_data_rate), Le(max_data_rate)));
}
NetworkControllerConfig InitialConfig(
int starting_bandwidth_kbps = kInitialBitrate.kbps(),
int min_data_rate_kbps = 0,
int max_data_rate_kbps = 5 * kInitialBitrate.kbps()) {
NetworkControllerConfig config;
config.constraints.at_time = kDefaultStartTime;
config.constraints.min_data_rate =
DataRate::KilobitsPerSec(min_data_rate_kbps);
config.constraints.max_data_rate =
DataRate::KilobitsPerSec(max_data_rate_kbps);
config.constraints.starting_rate =
DataRate::KilobitsPerSec(starting_bandwidth_kbps);
return config;
}
ProcessInterval InitialProcessInterval() {
ProcessInterval process_interval;
process_interval.at_time = kDefaultStartTime;
return process_interval;
}
NetworkRouteChange CreateRouteChange(Timestamp at_time,
DataRate start_rate,
DataRate min_rate = DataRate::Zero(),
DataRate max_rate = DataRate::Infinity()) {
NetworkRouteChange route_change;
route_change.at_time = at_time;
route_change.constraints.at_time = at_time;
route_change.constraints.min_data_rate = min_rate;
route_change.constraints.max_data_rate = max_rate;
route_change.constraints.starting_rate = start_rate;
return route_change;
}
} // namespace
class BbrNetworkControllerTest : public ::testing::Test {
protected:
BbrNetworkControllerTest() {}
~BbrNetworkControllerTest() override {}
};
TEST_F(BbrNetworkControllerTest, SendsConfigurationOnFirstProcess) {
std::unique_ptr<NetworkControllerInterface> controller_;
controller_.reset(new bbr::BbrNetworkController(InitialConfig()));
NetworkControlUpdate update =
controller_->OnProcessInterval(InitialProcessInterval());
EXPECT_THAT(*update.target_rate, TargetRateCloseTo(kInitialBitrate));
EXPECT_THAT(*update.pacer_config,
Property(&PacerConfig::data_rate, Ge(kInitialBitrate)));
EXPECT_THAT(*update.congestion_window, Property(&DataSize::IsFinite, true));
}
TEST_F(BbrNetworkControllerTest, SendsConfigurationOnNetworkRouteChanged) {
std::unique_ptr<NetworkControllerInterface> controller_;
controller_.reset(new bbr::BbrNetworkController(InitialConfig()));
NetworkControlUpdate update =
controller_->OnProcessInterval(InitialProcessInterval());
EXPECT_TRUE(update.target_rate.has_value());
EXPECT_TRUE(update.pacer_config.has_value());
EXPECT_TRUE(update.congestion_window.has_value());
DataRate new_bitrate = DataRate::BitsPerSec(200000);
update = controller_->OnNetworkRouteChange(
CreateRouteChange(kDefaultStartTime, new_bitrate));
EXPECT_THAT(*update.target_rate, TargetRateCloseTo(new_bitrate));
EXPECT_THAT(*update.pacer_config,
Property(&PacerConfig::data_rate, Ge(kInitialBitrate)));
EXPECT_TRUE(update.congestion_window.has_value());
}
// Bandwidth estimation is updated when feedbacks are received.
// Feedbacks which show an increasing delay cause the estimation to be reduced.
TEST_F(BbrNetworkControllerTest, UpdatesTargetSendRate) {
BbrNetworkControllerFactory factory;
Scenario s("bbr_unit/updates_rate", false);
CallClientConfig config;
config.transport.cc_factory = &factory;
config.transport.rates.min_rate = DataRate::KilobitsPerSec(10);
config.transport.rates.max_rate = DataRate::KilobitsPerSec(1500);
config.transport.rates.start_rate = DataRate::KilobitsPerSec(300);
auto send_net = s.CreateMutableSimulationNode([](NetworkSimulationConfig* c) {
c->bandwidth = DataRate::KilobitsPerSec(500);
c->delay = TimeDelta::Millis(100);
c->loss_rate = 0.0;
});
auto ret_net = s.CreateMutableSimulationNode(
[](NetworkSimulationConfig* c) { c->delay = TimeDelta::Millis(100); });
auto* client = s.CreateClient("send", config);
const DataSize kOverhead = DataSize::Bytes(38); // IPV4 + UDP + SRTP
auto routes = s.CreateRoutes(client, {send_net->node()}, kOverhead,
s.CreateClient("recv", CallClientConfig()),
{ret_net->node()}, kOverhead);
s.CreateVideoStream(routes->forward(), VideoStreamConfig());
s.RunFor(TimeDelta::Seconds(25));
EXPECT_NEAR(client->send_bandwidth().kbps(), 450, 100);
send_net->UpdateConfig([](NetworkSimulationConfig* c) {
c->bandwidth = DataRate::KilobitsPerSec(800);
c->delay = TimeDelta::Millis(100);
});
s.RunFor(TimeDelta::Seconds(20));
EXPECT_NEAR(client->send_bandwidth().kbps(), 750, 150);
send_net->UpdateConfig([](NetworkSimulationConfig* c) {
c->bandwidth = DataRate::KilobitsPerSec(200);
c->delay = TimeDelta::Millis(200);
});
ret_net->UpdateConfig(
[](NetworkSimulationConfig* c) { c->delay = TimeDelta::Millis(200); });
s.RunFor(TimeDelta::Seconds(35));
EXPECT_NEAR(client->send_bandwidth().kbps(), 170, 50);
}
} // namespace test
} // namespace webrtc