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webrtc_m130/modules/congestion_controller/probe_controller_unittest.cc
Sebastian Jansson ea86bb74fc Revert "Revert "Revert "Reland "Moved congestion controller to task queue."""" 
This reverts commit 65792c5a5c542201f7b9feefded505842692e6ed.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Revert "Revert "Reland "Moved congestion controller to task queue."""
> 
> This reverts commit 4e849f6925b2ac44b0957a228d7131fc391fca54.
> 
> Reason for revert: <INSERT REASONING HERE>
> 
> Original change's description:
> > Revert "Reland "Moved congestion controller to task queue.""
> > 
> > This reverts commit 57daeb7ac7f3d80992905b53fea500953fcfd793.
> > 
> > Reason for revert: Cause increased congestion and deadlocks in downstream project
> > 
> > Original change's description:
> > > Reland "Moved congestion controller to task queue."
> > > 
> > > This is a reland of 0cbcba7ea0dced1a7f353c64d6cf91d46ccb29f9.
> > > 
> > > Original change's description:
> > > > Moved congestion controller to task queue.
> > > > 
> > > > The goal of this work is to make it easier to experiment with the
> > > > bandwidth estimation implementation. For this reason network control
> > > > functionality is moved from SendSideCongestionController(SSCC),
> > > > PacedSender and BitrateController to the newly created
> > > > GoogCcNetworkController which implements the newly created
> > > > NetworkControllerInterface. This allows the implementation to be
> > > > replaced at runtime in the future.
> > > > 
> > > > This is the first part of a split of a larger CL, see:
> > > > https://webrtc-review.googlesource.com/c/src/+/39788/8
> > > > For further explanations.
> > > > 
> > > > Bug: webrtc:8415
> > > > Change-Id: I770189c04cc31b313bd4e57821acff55fbcb1ad3
> > > > Reviewed-on: https://webrtc-review.googlesource.com/43840
> > > > Commit-Queue: Sebastian Jansson <srte@webrtc.org>
> > > > Reviewed-by: Björn Terelius <terelius@webrtc.org>
> > > > Reviewed-by: Stefan Holmer <stefan@webrtc.org>
> > > > Cr-Commit-Position: refs/heads/master@{#21868}
> > > 
> > > Bug: webrtc:8415
> > > Change-Id: I1d1756a30deed5b421b1c91c1918a13b6bb455da
> > > Reviewed-on: https://webrtc-review.googlesource.com/48000
> > > Reviewed-by: Stefan Holmer <stefan@webrtc.org>
> > > Commit-Queue: Sebastian Jansson <srte@webrtc.org>
> > > Cr-Commit-Position: refs/heads/master@{#21899}
> > 
> > TBR=terelius@webrtc.org,stefan@webrtc.org,srte@webrtc.org
> > 
> > # Not skipping CQ checks because original CL landed > 1 day ago.
> > 
> > Bug: webrtc:8415
> > Change-Id: Ida8074dcac2cc28b3629228eb22846d8a8e81b83
> > Reviewed-on: https://webrtc-review.googlesource.com/52980
> > Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
> > Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
> > Cr-Commit-Position: refs/heads/master@{#22017}
> 
> TBR=danilchap@webrtc.org,terelius@webrtc.org,stefan@webrtc.org,srte@webrtc.org
> 
> Change-Id: I3393b74370c4f4d0955f50728005b2b925be169b
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: webrtc:8415
> Reviewed-on: https://webrtc-review.googlesource.com/53262
> Reviewed-by: Sebastian Jansson <srte@webrtc.org>
> Commit-Queue: Sebastian Jansson <srte@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#22023}

TBR=danilchap@webrtc.org,terelius@webrtc.org,stefan@webrtc.org,srte@webrtc.org

Change-Id: Id68ad986ee51142b7be3381d0793709b4392fe2c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:8415
Reviewed-on: https://webrtc-review.googlesource.com/53360
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22024}
2018-02-14 16:53:49 +00:00

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/*
* Copyright (c) 2016 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 <memory>
#include "modules/congestion_controller/probe_controller.h"
#include "modules/pacing/mock/mock_paced_sender.h"
#include "rtc_base/logging.h"
#include "system_wrappers/include/clock.h"
#include "test/gmock.h"
#include "test/gtest.h"
using testing::_;
using testing::AtLeast;
using testing::NiceMock;
using testing::Return;
namespace webrtc {
namespace test {
namespace {
constexpr int kMinBitrateBps = 100;
constexpr int kStartBitrateBps = 300;
constexpr int kMaxBitrateBps = 10000;
constexpr int kExponentialProbingTimeoutMs = 5000;
constexpr int kAlrProbeInterval = 5000;
constexpr int kAlrEndedTimeoutMs = 3000;
constexpr int kBitrateDropTimeoutMs = 5000;
} // namespace
class ProbeControllerTest : public ::testing::Test {
protected:
ProbeControllerTest() : clock_(100000000L) {
probe_controller_.reset(new ProbeController(&pacer_, &clock_));
}
~ProbeControllerTest() override {}
SimulatedClock clock_;
NiceMock<MockPacedSender> pacer_;
std::unique_ptr<ProbeController> probe_controller_;
};
TEST_F(ProbeControllerTest, InitiatesProbingAtStart) {
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(AtLeast(2));
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
}
TEST_F(ProbeControllerTest, ProbeOnlyWhenNetworkIsUp) {
probe_controller_->OnNetworkStateChanged(kNetworkDown);
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(0);
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
testing::Mock::VerifyAndClearExpectations(&pacer_);
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(AtLeast(2));
probe_controller_->OnNetworkStateChanged(kNetworkUp);
}
TEST_F(ProbeControllerTest, InitiatesProbingOnMaxBitrateIncrease) {
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(AtLeast(2));
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
// Long enough to time out exponential probing.
clock_.AdvanceTimeMilliseconds(kExponentialProbingTimeoutMs);
probe_controller_->SetEstimatedBitrate(kStartBitrateBps);
probe_controller_->Process();
EXPECT_CALL(pacer_, CreateProbeCluster(kMaxBitrateBps + 100));
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps + 100);
}
TEST_F(ProbeControllerTest, InitiatesProbingOnMaxBitrateIncreaseAtMaxBitrate) {
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(AtLeast(2));
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
// Long enough to time out exponential probing.
clock_.AdvanceTimeMilliseconds(kExponentialProbingTimeoutMs);
probe_controller_->SetEstimatedBitrate(kStartBitrateBps);
probe_controller_->Process();
probe_controller_->SetEstimatedBitrate(kMaxBitrateBps);
EXPECT_CALL(pacer_, CreateProbeCluster(kMaxBitrateBps + 100));
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps + 100);
}
TEST_F(ProbeControllerTest, TestExponentialProbing) {
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
// Repeated probe should only be sent when estimated bitrate climbs above
// 0.7 * 6 * kStartBitrateBps = 1260.
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(0);
probe_controller_->SetEstimatedBitrate(1000);
testing::Mock::VerifyAndClearExpectations(&pacer_);
EXPECT_CALL(pacer_, CreateProbeCluster(2 * 1800));
probe_controller_->SetEstimatedBitrate(1800);
}
TEST_F(ProbeControllerTest, TestExponentialProbingTimeout) {
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
// Advance far enough to cause a time out in waiting for probing result.
clock_.AdvanceTimeMilliseconds(kExponentialProbingTimeoutMs);
probe_controller_->Process();
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(0);
probe_controller_->SetEstimatedBitrate(1800);
}
TEST_F(ProbeControllerTest, RequestProbeInAlr) {
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(2);
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
probe_controller_->SetEstimatedBitrate(500);
testing::Mock::VerifyAndClearExpectations(&pacer_);
EXPECT_CALL(pacer_, CreateProbeCluster(0.85 * 500)).Times(1);
EXPECT_CALL(pacer_, GetApplicationLimitedRegionStartTime())
.WillRepeatedly(Return(clock_.TimeInMilliseconds()));
clock_.AdvanceTimeMilliseconds(kAlrProbeInterval + 1);
probe_controller_->Process();
probe_controller_->SetEstimatedBitrate(250);
probe_controller_->RequestProbe();
}
TEST_F(ProbeControllerTest, RequestProbeWhenAlrEndedRecently) {
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(2);
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
probe_controller_->SetEstimatedBitrate(500);
testing::Mock::VerifyAndClearExpectations(&pacer_);
EXPECT_CALL(pacer_, CreateProbeCluster(0.85 * 500)).Times(1);
EXPECT_CALL(pacer_, GetApplicationLimitedRegionStartTime())
.WillRepeatedly(Return(rtc::nullopt));
clock_.AdvanceTimeMilliseconds(kAlrProbeInterval + 1);
probe_controller_->Process();
probe_controller_->SetEstimatedBitrate(250);
probe_controller_->SetAlrEndedTimeMs(clock_.TimeInMilliseconds());
clock_.AdvanceTimeMilliseconds(kAlrEndedTimeoutMs - 1);
probe_controller_->RequestProbe();
}
TEST_F(ProbeControllerTest, RequestProbeWhenAlrNotEndedRecently) {
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(2);
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
probe_controller_->SetEstimatedBitrate(500);
testing::Mock::VerifyAndClearExpectations(&pacer_);
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(0);
EXPECT_CALL(pacer_, GetApplicationLimitedRegionStartTime())
.WillRepeatedly(Return(rtc::nullopt));
clock_.AdvanceTimeMilliseconds(kAlrProbeInterval + 1);
probe_controller_->Process();
probe_controller_->SetEstimatedBitrate(250);
probe_controller_->SetAlrEndedTimeMs(clock_.TimeInMilliseconds());
clock_.AdvanceTimeMilliseconds(kAlrEndedTimeoutMs + 1);
probe_controller_->RequestProbe();
}
TEST_F(ProbeControllerTest, RequestProbeWhenBweDropNotRecent) {
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(2);
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
probe_controller_->SetEstimatedBitrate(500);
testing::Mock::VerifyAndClearExpectations(&pacer_);
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(0);
EXPECT_CALL(pacer_, GetApplicationLimitedRegionStartTime())
.WillRepeatedly(Return(clock_.TimeInMilliseconds()));
clock_.AdvanceTimeMilliseconds(kAlrProbeInterval + 1);
probe_controller_->Process();
probe_controller_->SetEstimatedBitrate(250);
clock_.AdvanceTimeMilliseconds(kBitrateDropTimeoutMs + 1);
probe_controller_->RequestProbe();
}
TEST_F(ProbeControllerTest, PeriodicProbing) {
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(2);
probe_controller_->EnablePeriodicAlrProbing(true);
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
probe_controller_->SetEstimatedBitrate(500);
testing::Mock::VerifyAndClearExpectations(&pacer_);
int64_t start_time = clock_.TimeInMilliseconds();
// Expect the controller to send a new probe after 5s has passed.
EXPECT_CALL(pacer_, CreateProbeCluster(1000)).Times(1);
EXPECT_CALL(pacer_, GetApplicationLimitedRegionStartTime())
.WillRepeatedly(Return(start_time));
clock_.AdvanceTimeMilliseconds(5000);
probe_controller_->Process();
probe_controller_->SetEstimatedBitrate(500);
testing::Mock::VerifyAndClearExpectations(&pacer_);
// The following probe should be sent at 10s into ALR.
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(0);
EXPECT_CALL(pacer_, GetApplicationLimitedRegionStartTime())
.WillRepeatedly(Return(start_time));
clock_.AdvanceTimeMilliseconds(4000);
probe_controller_->Process();
probe_controller_->SetEstimatedBitrate(500);
testing::Mock::VerifyAndClearExpectations(&pacer_);
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(1);
EXPECT_CALL(pacer_, GetApplicationLimitedRegionStartTime())
.WillRepeatedly(Return(start_time));
clock_.AdvanceTimeMilliseconds(1000);
probe_controller_->Process();
probe_controller_->SetEstimatedBitrate(500);
testing::Mock::VerifyAndClearExpectations(&pacer_);
}
TEST_F(ProbeControllerTest, PeriodicProbingAfterReset) {
testing::StrictMock<MockPacedSender> local_pacer;
probe_controller_.reset(new ProbeController(&local_pacer, &clock_));
int64_t alr_start_time = clock_.TimeInMilliseconds();
EXPECT_CALL(local_pacer, GetApplicationLimitedRegionStartTime())
.WillRepeatedly(Return(alr_start_time));
EXPECT_CALL(local_pacer, CreateProbeCluster(_)).Times(2);
probe_controller_->EnablePeriodicAlrProbing(true);
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
probe_controller_->Reset();
clock_.AdvanceTimeMilliseconds(10000);
probe_controller_->Process();
EXPECT_CALL(local_pacer, CreateProbeCluster(_)).Times(2);
probe_controller_->SetBitrates(kMinBitrateBps, kStartBitrateBps,
kMaxBitrateBps);
// Make sure we use |kStartBitrateBps| as the estimated bitrate
// until SetEstimatedBitrate is called with an updated estimate.
clock_.AdvanceTimeMilliseconds(10000);
EXPECT_CALL(local_pacer, CreateProbeCluster(kStartBitrateBps*2));
probe_controller_->Process();
}
TEST_F(ProbeControllerTest, TestExponentialProbingOverflow) {
const int64_t kMbpsMultiplier = 1000000;
probe_controller_->SetBitrates(kMinBitrateBps, 10 * kMbpsMultiplier,
100 * kMbpsMultiplier);
// Verify that probe bitrate is capped at the specified max bitrate
EXPECT_CALL(pacer_, CreateProbeCluster(100 * kMbpsMultiplier));
probe_controller_->SetEstimatedBitrate(60 * kMbpsMultiplier);
testing::Mock::VerifyAndClearExpectations(&pacer_);
// Verify that repeated probes aren't sent.
EXPECT_CALL(pacer_, CreateProbeCluster(_)).Times(0);
probe_controller_->SetEstimatedBitrate(100 * kMbpsMultiplier);
}
} // namespace test
} // namespace webrtc
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