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network_quality_estimator_unittest.cc
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network_quality_estimator_unittest.cc
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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/nqe/network_quality_estimator.h"
#include <stddef.h>
#include <stdint.h>
#include <cmath>
#include <limits>
#include <map>
#include <string>
#include <utility>
#include <vector>
#include "base/check_op.h"
#include "base/macros.h"
#include "base/metrics/histogram_samples.h"
#include "base/run_loop.h"
#include "base/strings/string_number_conversions.h"
#include "base/task/thread_pool/thread_pool_instance.h"
#include "base/test/metrics/histogram_tester.h"
#include "base/test/simple_test_tick_clock.h"
#include "base/threading/platform_thread.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "build/chromeos_buildflags.h"
#include "net/base/load_flags.h"
#include "net/base/network_change_notifier.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_response_info.h"
#include "net/http/http_status_code.h"
#include "net/log/test_net_log.h"
#include "net/nqe/effective_connection_type.h"
#include "net/nqe/effective_connection_type_observer.h"
#include "net/nqe/network_quality_estimator_test_util.h"
#include "net/nqe/network_quality_observation.h"
#include "net/nqe/network_quality_observation_source.h"
#include "net/nqe/observation_buffer.h"
#include "net/nqe/rtt_throughput_estimates_observer.h"
#include "net/socket/socket_performance_watcher.h"
#include "net/socket/socket_performance_watcher_factory.h"
#include "net/test/test_with_task_environment.h"
#include "net/traffic_annotation/network_traffic_annotation_test_helper.h"
#include "net/url_request/url_request.h"
#include "net/url_request/url_request_test_util.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "url/gurl.h"
namespace {
// Verifies that the number of samples in the bucket with minimum value
// |bucket_min| in |histogram| are at least |expected_min_count_samples|.
void ExpectBucketCountAtLeast(base::HistogramTester* histogram_tester,
const std::string& histogram,
int32_t bucket_min,
int32_t expected_min_count_samples) {
std::vector<base::Bucket> buckets =
histogram_tester->GetAllSamples(histogram);
int actual_count_samples = 0;
for (const auto& bucket : buckets) {
if (bucket.min == bucket_min)
actual_count_samples += bucket.count;
}
EXPECT_LE(expected_min_count_samples, actual_count_samples)
<< " histogram=" << histogram << " bucket_min=" << bucket_min
<< " expected_min_count_samples=" << expected_min_count_samples;
}
size_t GetHistogramCount(base::HistogramTester* histogram_tester,
const std::string& histogram_name) {
base::ThreadPoolInstance::Get()->FlushForTesting();
base::RunLoop().RunUntilIdle();
const std::vector<base::Bucket> buckets =
histogram_tester->GetAllSamples(histogram_name);
size_t total_count = 0;
for (const auto& bucket : buckets) {
total_count += bucket.count;
}
return total_count;
}
} // namespace
namespace net {
namespace {
class TestEffectiveConnectionTypeObserver
: public EffectiveConnectionTypeObserver {
public:
std::vector<EffectiveConnectionType>& effective_connection_types() {
return effective_connection_types_;
}
// EffectiveConnectionTypeObserver implementation:
void OnEffectiveConnectionTypeChanged(EffectiveConnectionType type) override {
effective_connection_types_.push_back(type);
}
private:
std::vector<EffectiveConnectionType> effective_connection_types_;
};
class TestPeerToPeerConnectionsCountObserver
: public PeerToPeerConnectionsCountObserver {
public:
uint32_t count() { return count_; }
private:
// PeerToPeerConnectionsCountObserver:
void OnPeerToPeerConnectionsCountChange(uint32_t count) override {
count_ = count;
}
uint32_t count_ = 0u;
};
class TestRTTAndThroughputEstimatesObserver
: public RTTAndThroughputEstimatesObserver {
public:
TestRTTAndThroughputEstimatesObserver()
: http_rtt_(nqe::internal::InvalidRTT()),
transport_rtt_(nqe::internal::InvalidRTT()),
downstream_throughput_kbps_(nqe::internal::INVALID_RTT_THROUGHPUT),
notifications_received_(0) {}
// RTTAndThroughputEstimatesObserver implementation:
void OnRTTOrThroughputEstimatesComputed(
base::TimeDelta http_rtt,
base::TimeDelta transport_rtt,
int32_t downstream_throughput_kbps) override {
http_rtt_ = http_rtt;
transport_rtt_ = transport_rtt;
downstream_throughput_kbps_ = downstream_throughput_kbps;
notifications_received_++;
}
int notifications_received() const { return notifications_received_; }
base::TimeDelta http_rtt() const { return http_rtt_; }
base::TimeDelta transport_rtt() const { return transport_rtt_; }
int32_t downstream_throughput_kbps() const {
return downstream_throughput_kbps_;
}
private:
base::TimeDelta http_rtt_;
base::TimeDelta transport_rtt_;
int32_t downstream_throughput_kbps_;
int notifications_received_;
};
class TestRTTObserver : public NetworkQualityEstimator::RTTObserver {
public:
struct Observation {
Observation(int32_t ms,
const base::TimeTicks& ts,
NetworkQualityObservationSource src)
: rtt_ms(ms), timestamp(ts), source(src) {}
int32_t rtt_ms;
base::TimeTicks timestamp;
NetworkQualityObservationSource source;
};
std::vector<Observation>& observations() { return observations_; }
// RttObserver implementation:
void OnRTTObservation(int32_t rtt_ms,
const base::TimeTicks& timestamp,
NetworkQualityObservationSource source) override {
observations_.push_back(Observation(rtt_ms, timestamp, source));
}
// Returns the last received RTT observation that has source set to |source|.
base::TimeDelta last_rtt(NetworkQualityObservationSource source) {
for (auto i = observations_.rbegin(); i != observations_.rend(); ++i) {
Observation observation = *i;
if (observation.source == source)
return base::TimeDelta::FromMilliseconds(observation.rtt_ms);
}
return nqe::internal::InvalidRTT();
}
private:
std::vector<Observation> observations_;
};
class TestThroughputObserver
: public NetworkQualityEstimator::ThroughputObserver {
public:
struct Observation {
Observation(int32_t kbps,
const base::TimeTicks& ts,
NetworkQualityObservationSource src)
: throughput_kbps(kbps), timestamp(ts), source(src) {}
int32_t throughput_kbps;
base::TimeTicks timestamp;
NetworkQualityObservationSource source;
};
std::vector<Observation>& observations() { return observations_; }
// ThroughputObserver implementation:
void OnThroughputObservation(
int32_t throughput_kbps,
const base::TimeTicks& timestamp,
NetworkQualityObservationSource source) override {
observations_.push_back(Observation(throughput_kbps, timestamp, source));
}
private:
std::vector<Observation> observations_;
};
} // namespace
using NetworkQualityEstimatorTest = TestWithTaskEnvironment;
TEST_F(NetworkQualityEstimatorTest, TestKbpsRTTUpdates) {
base::HistogramTester histogram_tester;
// Enable requests to local host to be used for network quality estimation.
std::map<std::string, std::string> variation_params;
variation_params["throughput_min_requests_in_flight"] = "1";
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_UNKNOWN, "test");
histogram_tester.ExpectUniqueSample("NQE.CachedNetworkQualityAvailable",
false, 2);
base::TimeDelta rtt;
int32_t kbps;
EXPECT_FALSE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request->Start();
test_delegate.RunUntilComplete();
// Pump message loop to allow estimator tasks to be processed.
base::RunLoop().RunUntilIdle();
// Both RTT and downstream throughput should be updated.
base::TimeDelta http_rtt;
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &http_rtt, nullptr));
EXPECT_EQ(http_rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
base::TimeDelta transport_rtt;
EXPECT_FALSE(estimator.GetTransportRTT());
EXPECT_FALSE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &transport_rtt, nullptr));
// Verify the contents of the net log.
EXPECT_LE(
2, estimator.GetEntriesCount(NetLogEventType::NETWORK_QUALITY_CHANGED));
EXPECT_EQ(http_rtt.InMilliseconds(),
estimator.GetNetLogLastIntegerValue(
NetLogEventType::NETWORK_QUALITY_CHANGED, "http_rtt_ms"));
EXPECT_EQ(-1,
estimator.GetNetLogLastIntegerValue(
NetLogEventType::NETWORK_QUALITY_CHANGED, "transport_rtt_ms"));
EXPECT_EQ(kbps, estimator.GetNetLogLastIntegerValue(
NetLogEventType::NETWORK_QUALITY_CHANGED,
"downstream_throughput_kbps"));
// Check UMA histograms.
histogram_tester.ExpectUniqueSample(
"NQE.MainFrame.EffectiveConnectionType",
EffectiveConnectionType::EFFECTIVE_CONNECTION_TYPE_UNKNOWN, 1);
EXPECT_LE(1u,
histogram_tester.GetAllSamples("NQE.RTT.OnECTComputation").size());
EXPECT_LE(1u,
histogram_tester.GetAllSamples("NQE.Kbps.OnECTComputation").size());
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource", NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP, 1);
histogram_tester.ExpectBucketCount(
"NQE.Kbps.ObservationSource", NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP, 1);
std::unique_ptr<URLRequest> request2(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request2->SetLoadFlags(request2->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request2->Start();
test_delegate.RunUntilComplete();
histogram_tester.ExpectTotalCount("NQE.MainFrame.EffectiveConnectionType", 2);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test-1");
histogram_tester.ExpectUniqueSample("NQE.CachedNetworkQualityAvailable",
false, 3);
histogram_tester.ExpectTotalCount("NQE.RatioMedianRTT.WiFi", 0);
EXPECT_FALSE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
// Verify that metrics are logged correctly on main-frame requests.
histogram_tester.ExpectTotalCount("NQE.MainFrame.RTT.Percentile50", 1);
histogram_tester.ExpectTotalCount("NQE.MainFrame.TransportRTT.Percentile50",
0);
histogram_tester.ExpectTotalCount("NQE.MainFrame.Kbps.Percentile50", 1);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, std::string());
histogram_tester.ExpectUniqueSample("NQE.CachedNetworkQualityAvailable",
false, 4);
EXPECT_FALSE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
std::unique_ptr<URLRequest> request3(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request3->SetLoadFlags(request2->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request3->Start();
test_delegate.RunUntilComplete();
histogram_tester.ExpectBucketCount(
"NQE.MainFrame.EffectiveConnectionType",
EffectiveConnectionType::EFFECTIVE_CONNECTION_TYPE_UNKNOWN, 2);
histogram_tester.ExpectTotalCount("NQE.MainFrame.EffectiveConnectionType", 3);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_UNKNOWN, "test");
histogram_tester.ExpectBucketCount("NQE.CachedNetworkQualityAvailable", false,
4);
}
// Tests that the network quality estimator writes and reads network quality
// from the cache store correctly.
TEST_F(NetworkQualityEstimatorTest, Caching) {
for (NetworkChangeNotifier::ConnectionType connection_type :
{NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI,
NetworkChangeNotifier::ConnectionType::CONNECTION_ETHERNET}) {
base::HistogramTester histogram_tester;
std::map<std::string, std::string> variation_params;
variation_params["throughput_min_requests_in_flight"] = "1";
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
const std::string connection_id =
connection_type ==
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI
? "test"
: "";
estimator.SimulateNetworkChange(connection_type, connection_id);
histogram_tester.ExpectUniqueSample("NQE.CachedNetworkQualityAvailable",
false, 2);
base::TimeDelta rtt;
int32_t kbps;
EXPECT_FALSE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
// Start two requests so that the network quality is added to cache store at
// the beginning of the second request from the network traffic observed
// from the first request.
for (size_t i = 0; i < 2; ++i) {
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request->Start();
test_delegate.RunUntilComplete();
}
histogram_tester.ExpectUniqueSample("NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP,
2);
base::RunLoop().RunUntilIdle();
// Both RTT and downstream throughput should be updated.
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
EXPECT_NE(EFFECTIVE_CONNECTION_TYPE_UNKNOWN,
estimator.GetEffectiveConnectionType());
EXPECT_FALSE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(estimator.GetTransportRTT());
histogram_tester.ExpectBucketCount("NQE.CachedNetworkQualityAvailable",
false, 2);
// Add the observers before changing the network type.
TestEffectiveConnectionTypeObserver observer;
estimator.AddEffectiveConnectionTypeObserver(&observer);
TestRTTObserver rtt_observer;
estimator.AddRTTObserver(&rtt_observer);
TestThroughputObserver throughput_observer;
estimator.AddThroughputObserver(&throughput_observer);
// |observer| should be notified as soon as it is added.
base::RunLoop().RunUntilIdle();
EXPECT_EQ(1U, observer.effective_connection_types().size());
int num_net_log_entries =
estimator.GetEntriesCount(NetLogEventType::NETWORK_QUALITY_CHANGED);
EXPECT_LE(2, num_net_log_entries);
estimator.SimulateNetworkChange(connection_type, connection_id);
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP_CACHED_ESTIMATE, 1);
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_TRANSPORT_CACHED_ESTIMATE, 1);
histogram_tester.ExpectTotalCount("NQE.RTT.ObservationSource", 4);
histogram_tester.ExpectBucketCount(
"NQE.Kbps.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_HTTP_CACHED_ESTIMATE, 1);
// Verify the contents of the net log.
EXPECT_LE(
1, estimator.GetEntriesCount(NetLogEventType::NETWORK_QUALITY_CHANGED) -
num_net_log_entries);
EXPECT_NE(-1, estimator.GetNetLogLastIntegerValue(
NetLogEventType::NETWORK_QUALITY_CHANGED, "http_rtt_ms"));
EXPECT_NE(
-1, estimator.GetNetLogLastIntegerValue(
NetLogEventType::NETWORK_QUALITY_CHANGED, "transport_rtt_ms"));
EXPECT_NE(-1, estimator.GetNetLogLastIntegerValue(
NetLogEventType::NETWORK_QUALITY_CHANGED,
"downstream_throughput_kbps"));
EXPECT_EQ(GetNameForEffectiveConnectionType(
estimator.GetEffectiveConnectionType()),
estimator.GetNetLogLastStringValue(
NetLogEventType::NETWORK_QUALITY_CHANGED,
"effective_connection_type"));
histogram_tester.ExpectBucketCount("NQE.CachedNetworkQualityAvailable",
true, 1);
histogram_tester.ExpectTotalCount("NQE.CachedNetworkQualityAvailable", 3);
base::RunLoop().RunUntilIdle();
// Verify that the cached network quality was read, and observers were
// notified. |observer| must be notified once right after it was added, and
// once again after the cached network quality was read.
EXPECT_LE(2U, observer.effective_connection_types().size());
EXPECT_EQ(estimator.GetEffectiveConnectionType(),
observer.effective_connection_types().back());
EXPECT_EQ(2U, rtt_observer.observations().size());
EXPECT_EQ(1U, throughput_observer.observations().size());
}
}
// Tests that the network quality estimator does not read the network quality
// from the cache store when caching is not enabled.
TEST_F(NetworkQualityEstimatorTest, CachingDisabled) {
base::HistogramTester histogram_tester;
std::map<std::string, std::string> variation_params;
// Do not set |persistent_cache_reading_enabled| variation param.
variation_params["persistent_cache_reading_enabled"] = "false";
variation_params["throughput_min_requests_in_flight"] = "1";
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test");
histogram_tester.ExpectTotalCount("NQE.CachedNetworkQualityAvailable", 0);
base::TimeDelta rtt;
int32_t kbps;
EXPECT_FALSE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
// Start two requests so that the network quality is added to cache store at
// the beginning of the second request from the network traffic observed from
// the first request.
for (size_t i = 0; i < 2; ++i) {
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME_DEPRECATED);
request->Start();
test_delegate.RunUntilComplete();
}
base::RunLoop().RunUntilIdle();
// Both RTT and downstream throughput should be updated.
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
EXPECT_NE(EFFECTIVE_CONNECTION_TYPE_UNKNOWN,
estimator.GetEffectiveConnectionType());
EXPECT_FALSE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(estimator.GetTransportRTT());
histogram_tester.ExpectTotalCount("NQE.CachedNetworkQualityAvailable", 0);
// Add the observers before changing the network type.
TestRTTObserver rtt_observer;
estimator.AddRTTObserver(&rtt_observer);
TestThroughputObserver throughput_observer;
estimator.AddThroughputObserver(&throughput_observer);
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_2G, "test");
histogram_tester.ExpectTotalCount("NQE.CachedNetworkQualityAvailable", 0);
base::RunLoop().RunUntilIdle();
// Verify that the cached network quality was read, and observers were
// notified. |observer| must be notified once right after it was added, and
// once again after the cached network quality was read.
EXPECT_EQ(0U, rtt_observer.observations().size());
EXPECT_EQ(0U, throughput_observer.observations().size());
}
TEST_F(NetworkQualityEstimatorTest, QuicObservations) {
base::HistogramTester histogram_tester;
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.OnUpdatedTransportRTTAvailable(
SocketPerformanceWatcherFactory::PROTOCOL_TCP,
base::TimeDelta::FromMilliseconds(10), absl::nullopt);
estimator.OnUpdatedTransportRTTAvailable(
SocketPerformanceWatcherFactory::PROTOCOL_QUIC,
base::TimeDelta::FromMilliseconds(10), absl::nullopt);
histogram_tester.ExpectBucketCount("NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_TCP, 1);
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource", NETWORK_QUALITY_OBSERVATION_SOURCE_QUIC, 1);
histogram_tester.ExpectTotalCount("NQE.EndToEndRTT.OnECTComputation", 1);
histogram_tester.ExpectTotalCount("NQE.RTT.ObservationSource", 2);
// Verify that the QUIC RTT samples are used when computing transport RTT
// estimate.
EXPECT_EQ(base::TimeDelta::FromMilliseconds(10), estimator.GetTransportRTT());
EXPECT_FALSE(estimator.GetHttpRTT().has_value());
}
// Verifies that the QUIC RTT samples are used when computing transport RTT
// estimate.
TEST_F(NetworkQualityEstimatorTest,
QuicObservationsUsedForTransportRTTComputation) {
base::HistogramTester histogram_tester;
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.OnUpdatedTransportRTTAvailable(
SocketPerformanceWatcherFactory::PROTOCOL_QUIC,
base::TimeDelta::FromMilliseconds(10), absl::nullopt);
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource", NETWORK_QUALITY_OBSERVATION_SOURCE_QUIC, 1);
histogram_tester.ExpectTotalCount("NQE.EndToEndRTT.OnECTComputation", 1);
histogram_tester.ExpectTotalCount("NQE.RTT.ObservationSource", 1);
EXPECT_EQ(base::TimeDelta::FromMilliseconds(10), estimator.GetTransportRTT());
EXPECT_FALSE(estimator.GetHttpRTT().has_value());
}
// Verifies that the H2 RTT samples are used when computing transport RTT
// estimate.
TEST_F(NetworkQualityEstimatorTest,
H2ObservationsUsedForTransportRTTComputation) {
base::HistogramTester histogram_tester;
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
estimator.RecordSpdyPingLatency(
net::HostPortPair::FromString("www.test.com:443"),
base::TimeDelta::FromMilliseconds(10));
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource", NETWORK_QUALITY_OBSERVATION_SOURCE_H2_PINGS,
1);
histogram_tester.ExpectTotalCount("NQE.EndToEndRTT.OnECTComputation", 1);
histogram_tester.ExpectTotalCount("NQE.RTT.ObservationSource", 1);
EXPECT_EQ(base::TimeDelta::FromMilliseconds(10), estimator.GetTransportRTT());
EXPECT_FALSE(estimator.GetHttpRTT().has_value());
}
TEST_F(NetworkQualityEstimatorTest, StoreObservations) {
std::map<std::string, std::string> variation_params;
variation_params["throughput_min_requests_in_flight"] = "1";
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
base::TimeDelta rtt;
int32_t kbps;
EXPECT_FALSE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
const size_t kMaxObservations = 10;
for (size_t i = 0; i < kMaxObservations; ++i) {
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->Start();
test_delegate.RunUntilComplete();
// Pump the message loop to process estimator tasks.
base::RunLoop().RunUntilIdle();
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
}
// Verify that the stored observations are cleared on network change.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test-2");
EXPECT_FALSE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_FALSE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
}
// This test notifies NetworkQualityEstimator of received data. Next,
// throughput and RTT percentiles are checked for correctness by doing simple
// verifications.
TEST_F(NetworkQualityEstimatorTest, ComputedPercentiles) {
std::map<std::string, std::string> variation_params;
variation_params["throughput_min_requests_in_flight"] = "1";
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
EXPECT_EQ(nqe::internal::InvalidRTT(),
estimator.GetRTTEstimateInternal(
base::TimeTicks(), nqe::internal::OBSERVATION_CATEGORY_HTTP,
100, nullptr));
EXPECT_EQ(nqe::internal::INVALID_RTT_THROUGHPUT,
estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), 100));
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
for (size_t i = 0; i < 10U; ++i) {
std::unique_ptr<URLRequest> request(
context.CreateRequest(estimator.GetEchoURL(), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS));
request->Start();
test_delegate.RunUntilComplete();
}
// Verify the percentiles through simple tests.
for (int i = 0; i <= 100; ++i) {
EXPECT_GT(estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), i),
0);
EXPECT_LT(estimator.GetRTTEstimateInternal(
base::TimeTicks(), nqe::internal::OBSERVATION_CATEGORY_HTTP,
i, nullptr),
base::TimeDelta::Max());
if (i != 0) {
// Throughput percentiles are in decreasing order.
EXPECT_LE(estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), i),
estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), i - 1));
// RTT percentiles are in increasing order.
EXPECT_GE(estimator.GetRTTEstimateInternal(
base::TimeTicks(), nqe::internal::OBSERVATION_CATEGORY_HTTP,
i, nullptr),
estimator.GetRTTEstimateInternal(
base::TimeTicks(), nqe::internal::OBSERVATION_CATEGORY_HTTP,
i - 1, nullptr));
}
}
}
// Verifies that the observers receive the notifications when default estimates
// are added to the observations.
TEST_F(NetworkQualityEstimatorTest, DefaultObservations) {
base::HistogramTester histogram_tester;
TestEffectiveConnectionTypeObserver effective_connection_type_observer;
TestRTTAndThroughputEstimatesObserver rtt_throughput_estimates_observer;
TestRTTObserver rtt_observer;
TestThroughputObserver throughput_observer;
std::map<std::string, std::string> variation_params;
TestNetworkQualityEstimator estimator(
variation_params, false, false,
std::make_unique<RecordingBoundTestNetLog>());
// Default observations should be added when constructing the |estimator|.
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_HTTP_FROM_PLATFORM, 1);
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_TRANSPORT_FROM_PLATFORM, 1);
histogram_tester.ExpectBucketCount(
"NQE.Kbps.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_HTTP_FROM_PLATFORM, 1);
histogram_tester.ExpectTotalCount("NQE.RTT.ObservationSource", 2);
histogram_tester.ExpectTotalCount("NQE.Kbps.ObservationSource", 1);
// Default observations should be added on connection change.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_UNKNOWN, "unknown-1");
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_HTTP_FROM_PLATFORM, 2);
histogram_tester.ExpectBucketCount(
"NQE.RTT.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_TRANSPORT_FROM_PLATFORM, 2);
histogram_tester.ExpectBucketCount(
"NQE.Kbps.ObservationSource",
NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_HTTP_FROM_PLATFORM, 2);
histogram_tester.ExpectTotalCount("NQE.RTT.ObservationSource", 4);
histogram_tester.ExpectTotalCount("NQE.Kbps.ObservationSource", 2);
base::TimeDelta rtt;
int32_t kbps;
// Default estimates should be available.
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(115), rtt);
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(55), rtt);
EXPECT_EQ(rtt, estimator.GetTransportRTT().value());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(1961, kbps);
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
estimator.AddEffectiveConnectionTypeObserver(
&effective_connection_type_observer);
estimator.AddRTTAndThroughputEstimatesObserver(
&rtt_throughput_estimates_observer);
estimator.AddRTTObserver(&rtt_observer);
estimator.AddThroughputObserver(&throughput_observer);
// Simulate network change to 3G. Default estimates should be available.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_3G, "test-3");
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
// Taken from network_quality_estimator_params.cc.
EXPECT_EQ(base::TimeDelta::FromMilliseconds(273), rtt);
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(209), rtt);
EXPECT_EQ(rtt, estimator.GetTransportRTT());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(749, kbps);
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
EXPECT_NE(EFFECTIVE_CONNECTION_TYPE_UNKNOWN,
estimator.GetEffectiveConnectionType());
EXPECT_EQ(
1U,
effective_connection_type_observer.effective_connection_types().size());
EXPECT_NE(
EFFECTIVE_CONNECTION_TYPE_UNKNOWN,
effective_connection_type_observer.effective_connection_types().front());
// Verify the contents of the net log.
EXPECT_LE(
3, estimator.GetEntriesCount(NetLogEventType::NETWORK_QUALITY_CHANGED));
EXPECT_NE(
GetNameForEffectiveConnectionType(EFFECTIVE_CONNECTION_TYPE_UNKNOWN),
estimator.GetNetLogLastStringValue(
NetLogEventType::NETWORK_QUALITY_CHANGED,
"effective_connection_type"));
EXPECT_EQ(4, rtt_throughput_estimates_observer.notifications_received());
EXPECT_EQ(base::TimeDelta::FromMilliseconds(273),
rtt_throughput_estimates_observer.http_rtt());
EXPECT_EQ(base::TimeDelta::FromMilliseconds(209),
rtt_throughput_estimates_observer.transport_rtt());
EXPECT_EQ(749,
rtt_throughput_estimates_observer.downstream_throughput_kbps());
EXPECT_EQ(2U, rtt_observer.observations().size());
EXPECT_EQ(273, rtt_observer.observations().at(0).rtt_ms);
EXPECT_EQ(NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_HTTP_FROM_PLATFORM,
rtt_observer.observations().at(0).source);
EXPECT_EQ(209, rtt_observer.observations().at(1).rtt_ms);
EXPECT_EQ(NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_TRANSPORT_FROM_PLATFORM,
rtt_observer.observations().at(1).source);
EXPECT_EQ(1U, throughput_observer.observations().size());
EXPECT_EQ(749, throughput_observer.observations().at(0).throughput_kbps);
EXPECT_EQ(NETWORK_QUALITY_OBSERVATION_SOURCE_DEFAULT_HTTP_FROM_PLATFORM,
throughput_observer.observations().at(0).source);
}
// Verifies that the default observations are added to the set of observations.
// If default observations are overridden using field trial parameters, verify
// that the overriding values are used.
TEST_F(NetworkQualityEstimatorTest, DefaultObservationsOverridden) {
std::map<std::string, std::string> variation_params;
variation_params["Unknown.DefaultMedianKbps"] = "100";
variation_params["WiFi.DefaultMedianKbps"] = "200";
variation_params["2G.DefaultMedianKbps"] = "250";
variation_params["Unknown.DefaultMedianRTTMsec"] = "1000";
variation_params["WiFi.DefaultMedianRTTMsec"] = "2000";
// Negative variation value should not be used.
variation_params["2G.DefaultMedianRTTMsec"] = "-5";
variation_params["Unknown.DefaultMedianTransportRTTMsec"] = "500";
variation_params["WiFi.DefaultMedianTransportRTTMsec"] = "1000";
// Negative variation value should not be used.
variation_params["2G.DefaultMedianTransportRTTMsec"] = "-5";
TestNetworkQualityEstimator estimator(
variation_params, false, false,
std::make_unique<RecordingBoundTestNetLog>());
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_UNKNOWN, "unknown-1");
base::TimeDelta rtt;
int32_t kbps;
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1000), rtt);
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(500), rtt);
EXPECT_EQ(rtt, estimator.GetTransportRTT().value());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(100, kbps);
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
// Simulate network change to Wi-Fi.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test-1");
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(2000), rtt);
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1000), rtt);
EXPECT_EQ(rtt, estimator.GetTransportRTT().value());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(200, kbps);
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
// Simulate network change to 2G. Only the Kbps default estimate should be
// available.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_2G, "test-2");
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
// Taken from network_quality_estimator_params.cc.
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1726), rtt);
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1531), rtt);
EXPECT_EQ(rtt, estimator.GetTransportRTT().value());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(250, kbps);
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
// Simulate network change to 3G. Default estimates should be available.
estimator.SimulateNetworkChange(
NetworkChangeNotifier::ConnectionType::CONNECTION_3G, "test-3");
EXPECT_TRUE(estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_HTTP,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(273), rtt);
EXPECT_EQ(rtt, estimator.GetHttpRTT().value());
EXPECT_TRUE(
estimator.GetRecentRTT(nqe::internal::OBSERVATION_CATEGORY_TRANSPORT,
base::TimeTicks(), &rtt, nullptr));
EXPECT_EQ(base::TimeDelta::FromMilliseconds(209), rtt);
EXPECT_EQ(rtt, estimator.GetTransportRTT().value());
EXPECT_TRUE(
estimator.GetRecentDownlinkThroughputKbps(base::TimeTicks(), &kbps));
EXPECT_EQ(749, kbps);
EXPECT_EQ(kbps, estimator.GetDownstreamThroughputKbps().value());
}
// Tests that |GetEffectiveConnectionType| returns
// EFFECTIVE_CONNECTION_TYPE_OFFLINE when the device is currently offline.
TEST_F(NetworkQualityEstimatorTest, Offline) {
std::map<std::string, std::string> variation_params;
variation_params["add_default_platform_observations"] = "false";
TestNetworkQualityEstimator estimator(variation_params);
const struct {
NetworkChangeNotifier::ConnectionType connection_type;
EffectiveConnectionType expected_connection_type;
} tests[] = {
{NetworkChangeNotifier::CONNECTION_2G, EFFECTIVE_CONNECTION_TYPE_UNKNOWN},
{NetworkChangeNotifier::CONNECTION_NONE,
EFFECTIVE_CONNECTION_TYPE_OFFLINE},
{NetworkChangeNotifier::CONNECTION_3G, EFFECTIVE_CONNECTION_TYPE_UNKNOWN},
};
for (const auto& test : tests) {
estimator.SimulateNetworkChange(test.connection_type, "test");
EXPECT_EQ(test.expected_connection_type,
estimator.GetEffectiveConnectionType());
}
}
// Tests that |GetEffectiveConnectionType| returns correct connection type when
// only RTT thresholds are specified in the variation params.
TEST_F(NetworkQualityEstimatorTest, ObtainThresholdsOnlyRTT) {
std::map<std::string, std::string> variation_params;
variation_params["Offline.ThresholdMedianHttpRTTMsec"] = "4000";
variation_params["Slow2G.ThresholdMedianHttpRTTMsec"] = "2000";
variation_params["2G.ThresholdMedianHttpRTTMsec"] = "1000";
variation_params["3G.ThresholdMedianHttpRTTMsec"] = "500";
TestNetworkQualityEstimator estimator(variation_params);
// Simulate the connection type as Wi-Fi so that GetEffectiveConnectionType
// does not return Offline if the device is offline.
estimator.SimulateNetworkChange(NetworkChangeNotifier::CONNECTION_WIFI,
"test");
const struct {
int32_t rtt_msec;
EffectiveConnectionType expected_ect;
} tests[] = {
{5000, EFFECTIVE_CONNECTION_TYPE_OFFLINE},
{4000, EFFECTIVE_CONNECTION_TYPE_OFFLINE},
{3000, EFFECTIVE_CONNECTION_TYPE_SLOW_2G},
{2000, EFFECTIVE_CONNECTION_TYPE_SLOW_2G},
{1500, EFFECTIVE_CONNECTION_TYPE_2G},
{1000, EFFECTIVE_CONNECTION_TYPE_2G},
{700, EFFECTIVE_CONNECTION_TYPE_3G},
{500, EFFECTIVE_CONNECTION_TYPE_3G},
{400, EFFECTIVE_CONNECTION_TYPE_4G},