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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/base/network_quality_estimator.h"
#include <stdint.h>
#include <limits>
#include <map>
#include <utility>
#include <vector>
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/metrics/histogram_samples.h"
#include "base/run_loop.h"
#include "base/strings/string_number_conversions.h"
#include "base/test/histogram_tester.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "net/base/external_estimate_provider.h"
#include "net/base/load_flags.h"
#include "net/base/network_change_notifier.h"
#include "net/http/http_status_code.h"
#include "net/test/embedded_test_server/embedded_test_server.h"
#include "net/test/embedded_test_server/http_request.h"
#include "net/test/embedded_test_server/http_response.h"
#include "net/url_request/url_request_test_util.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "url/gurl.h"
namespace {
// Helps in setting the current network type and id.
class TestNetworkQualityEstimator : public net::NetworkQualityEstimator {
public:
TestNetworkQualityEstimator(
const std::map<std::string, std::string>& variation_params,
scoped_ptr<net::ExternalEstimateProvider> external_estimate_provider)
: NetworkQualityEstimator(std::move(external_estimate_provider),
variation_params,
true,
true) {
// Set up embedded test server.
embedded_test_server_.ServeFilesFromDirectory(
base::FilePath(FILE_PATH_LITERAL("net/data/url_request_unittest")));
EXPECT_TRUE(embedded_test_server_.Start());
embedded_test_server_.RegisterRequestHandler(base::Bind(
&TestNetworkQualityEstimator::HandleRequest, base::Unretained(this)));
}
explicit TestNetworkQualityEstimator(
const std::map<std::string, std::string>& variation_params)
: TestNetworkQualityEstimator(
variation_params,
scoped_ptr<net::ExternalEstimateProvider>()) {}
~TestNetworkQualityEstimator() override {}
// Overrides the current network type and id.
// Notifies network quality estimator of change in connection.
void SimulateNetworkChangeTo(net::NetworkChangeNotifier::ConnectionType type,
std::string network_id) {
current_network_type_ = type;
current_network_id_ = network_id;
OnConnectionTypeChanged(type);
}
// Called by embedded server when a HTTP request is received.
scoped_ptr<net::test_server::HttpResponse> HandleRequest(
const net::test_server::HttpRequest& request) {
scoped_ptr<net::test_server::BasicHttpResponse> http_response(
new net::test_server::BasicHttpResponse());
http_response->set_code(net::HTTP_OK);
http_response->set_content("hello");
http_response->set_content_type("text/plain");
return std::move(http_response);
}
// Returns a GURL hosted at embedded test server.
const GURL GetEchoURL() const {
return embedded_test_server_.GetURL("/echo.html");
}
using NetworkQualityEstimator::ReadCachedNetworkQualityEstimate;
using NetworkQualityEstimator::OnConnectionTypeChanged;
private:
// NetworkQualityEstimator implementation that returns the overridden network
// id (instead of invoking platform APIs).
NetworkQualityEstimator::NetworkID GetCurrentNetworkID() const override {
return NetworkQualityEstimator::NetworkID(current_network_type_,
current_network_id_);
}
net::NetworkChangeNotifier::ConnectionType current_network_type_;
std::string current_network_id_;
// Embedded server used for testing.
net::EmbeddedTestServer embedded_test_server_;
DISALLOW_COPY_AND_ASSIGN(TestNetworkQualityEstimator);
};
class TestRTTObserver : public net::NetworkQualityEstimator::RTTObserver {
public:
struct Observation {
Observation(int32_t ms,
const base::TimeTicks& ts,
net::NetworkQualityEstimator::ObservationSource src)
: rtt_ms(ms), timestamp(ts), source(src) {}
int32_t rtt_ms;
base::TimeTicks timestamp;
net::NetworkQualityEstimator::ObservationSource source;
};
std::vector<Observation>& observations() { return observations_; }
// RttObserver implementation:
void OnRTTObservation(
int32_t rtt_ms,
const base::TimeTicks& timestamp,
net::NetworkQualityEstimator::ObservationSource source) override {
observations_.push_back(Observation(rtt_ms, timestamp, source));
}
private:
std::vector<Observation> observations_;
};
class TestThroughputObserver
: public net::NetworkQualityEstimator::ThroughputObserver {
public:
struct Observation {
Observation(int32_t kbps,
const base::TimeTicks& ts,
net::NetworkQualityEstimator::ObservationSource src)
: throughput_kbps(kbps), timestamp(ts), source(src) {}
int32_t throughput_kbps;
base::TimeTicks timestamp;
net::NetworkQualityEstimator::ObservationSource source;
};
std::vector<Observation>& observations() { return observations_; }
// ThroughputObserver implementation:
void OnThroughputObservation(
int32_t throughput_kbps,
const base::TimeTicks& timestamp,
net::NetworkQualityEstimator::ObservationSource source) override {
observations_.push_back(Observation(throughput_kbps, timestamp, source));
}
private:
std::vector<Observation> observations_;
};
} // namespace
namespace net {
TEST(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;
TestNetworkQualityEstimator estimator(variation_params);
EXPECT_EQ(NetworkQualityEstimator::InvalidRTT(),
estimator.GetRTTEstimateInternal(base::TimeTicks(), 100));
EXPECT_EQ(NetworkQualityEstimator::kInvalidThroughput,
estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), 100));
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
scoped_ptr<URLRequest> request(context.CreateRequest(
estimator.GetEchoURL(), DEFAULT_PRIORITY, &test_delegate));
request->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME);
request->Start();
base::RunLoop().Run();
// Both RTT and downstream throughput should be updated.
EXPECT_NE(NetworkQualityEstimator::InvalidRTT(),
estimator.GetRTTEstimateInternal(base::TimeTicks(), 100));
EXPECT_NE(NetworkQualityEstimator::kInvalidThroughput,
estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), 100));
base::TimeDelta rtt = NetworkQualityEstimator::InvalidRTT();
int32_t kbps = NetworkQualityEstimator::kInvalidThroughput;
EXPECT_TRUE(estimator.GetRTTEstimate(&rtt));
EXPECT_TRUE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
EXPECT_NE(NetworkQualityEstimator::InvalidRTT(), rtt);
EXPECT_NE(NetworkQualityEstimator::kInvalidThroughput, kbps);
EXPECT_NEAR(
rtt.InMilliseconds(),
estimator.GetRTTEstimateInternal(base::TimeTicks(), 100).InMilliseconds(),
1);
// Check UMA histograms.
histogram_tester.ExpectTotalCount("NQE.PeakKbps.Unknown", 0);
histogram_tester.ExpectTotalCount("NQE.FastestRTT.Unknown", 0);
histogram_tester.ExpectTotalCount("NQE.RatioEstimatedToActualRTT.Unknown", 0);
scoped_ptr<URLRequest> request2(context.CreateRequest(
estimator.GetEchoURL(), DEFAULT_PRIORITY, &test_delegate));
request2->SetLoadFlags(request2->load_flags() | LOAD_MAIN_FRAME);
request2->Start();
base::RunLoop().Run();
histogram_tester.ExpectTotalCount("NQE.RTTObservations.Unknown", 1);
estimator.SimulateNetworkChangeTo(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test-1");
histogram_tester.ExpectTotalCount("NQE.PeakKbps.Unknown", 1);
histogram_tester.ExpectTotalCount("NQE.FastestRTT.Unknown", 1);
histogram_tester.ExpectTotalCount("NQE.RatioMedianRTT.WiFi", 0);
histogram_tester.ExpectTotalCount("NQE.RTT.Percentile0.Unknown", 1);
histogram_tester.ExpectTotalCount("NQE.RTT.Percentile10.Unknown", 1);
histogram_tester.ExpectTotalCount("NQE.RTT.Percentile50.Unknown", 1);
histogram_tester.ExpectTotalCount("NQE.RTT.Percentile90.Unknown", 1);
histogram_tester.ExpectTotalCount("NQE.RTT.Percentile100.Unknown", 1);
EXPECT_EQ(NetworkQualityEstimator::InvalidRTT(),
estimator.GetRTTEstimateInternal(base::TimeTicks(), 100));
EXPECT_EQ(NetworkQualityEstimator::kInvalidThroughput,
estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), 100));
EXPECT_FALSE(estimator.GetRTTEstimate(&rtt));
EXPECT_FALSE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
EXPECT_EQ(NetworkQualityEstimator::InvalidRTT(), rtt);
EXPECT_EQ(NetworkQualityEstimator::kInvalidThroughput, kbps);
estimator.SimulateNetworkChangeTo(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, std::string());
histogram_tester.ExpectTotalCount("NQE.PeakKbps.Unknown", 1);
histogram_tester.ExpectTotalCount("NQE.FastestRTT.Unknown", 1);
EXPECT_EQ(NetworkQualityEstimator::InvalidRTT(),
estimator.GetRTTEstimateInternal(base::TimeTicks(), 100));
EXPECT_EQ(NetworkQualityEstimator::kInvalidThroughput,
estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), 100));
EXPECT_FALSE(estimator.GetRTTEstimate(&rtt));
EXPECT_FALSE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
}
TEST(NetworkQualityEstimatorTest, StoreObservations) {
std::map<std::string, std::string> variation_params;
TestNetworkQualityEstimator estimator(variation_params);
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
// Push 10 more observations than the maximum buffer size.
for (size_t i = 0; i < estimator.kMaximumObservationsBufferSize + 10U; ++i) {
scoped_ptr<URLRequest> request(context.CreateRequest(
estimator.GetEchoURL(), DEFAULT_PRIORITY, &test_delegate));
request->Start();
base::RunLoop().Run();
}
EXPECT_EQ(static_cast<size_t>(
NetworkQualityEstimator::kMaximumObservationsBufferSize),
estimator.downstream_throughput_kbps_observations_.Size());
EXPECT_EQ(static_cast<size_t>(
NetworkQualityEstimator::kMaximumObservationsBufferSize),
estimator.rtt_msec_observations_.Size());
// Verify that the stored observations are cleared on network change.
estimator.SimulateNetworkChangeTo(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test-2");
EXPECT_EQ(0U, estimator.downstream_throughput_kbps_observations_.Size());
EXPECT_EQ(0U, estimator.rtt_msec_observations_.Size());
}
// Verifies that the percentiles are correctly computed. All observations have
// the same timestamp. Kbps percentiles must be in decreasing order. RTT
// percentiles must be in increasing order.
TEST(NetworkQualityEstimatorTest, PercentileSameTimestamps) {
std::map<std::string, std::string> variation_params;
TestNetworkQualityEstimator estimator(variation_params);
base::TimeTicks now = base::TimeTicks::Now();
// Network quality should be unavailable when no observations are available.
base::TimeDelta rtt;
EXPECT_FALSE(estimator.GetRTTEstimate(&rtt));
int32_t kbps;
EXPECT_FALSE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
// Insert samples from {1,2,3,..., 100}. First insert odd samples, then even
// samples. This helps in verifying that the order of samples does not matter.
for (int i = 1; i <= 99; i += 2) {
estimator.downstream_throughput_kbps_observations_.AddObservation(
NetworkQualityEstimator::Observation(
i, now, NetworkQualityEstimator::URL_REQUEST));
estimator.rtt_msec_observations_.AddObservation(
NetworkQualityEstimator::Observation(
i, now, NetworkQualityEstimator::URL_REQUEST));
EXPECT_TRUE(estimator.GetRTTEstimate(&rtt));
EXPECT_TRUE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
}
for (int i = 2; i <= 100; i += 2) {
estimator.downstream_throughput_kbps_observations_.AddObservation(
NetworkQualityEstimator::Observation(
i, now, NetworkQualityEstimator::URL_REQUEST));
estimator.rtt_msec_observations_.AddObservation(
NetworkQualityEstimator::Observation(
i, now, NetworkQualityEstimator::URL_REQUEST));
EXPECT_TRUE(estimator.GetRTTEstimate(&rtt));
EXPECT_TRUE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
}
for (int i = 0; i <= 100; ++i) {
// Checks if the difference between the two integers is less than 1. This is
// required because computed percentiles may be slightly different from
// what is expected due to floating point computation errors and integer
// rounding off errors.
EXPECT_NEAR(estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), i),
100 - i, 1);
EXPECT_NEAR(
estimator.GetRTTEstimateInternal(base::TimeTicks(), i).InMilliseconds(),
i, 1);
}
EXPECT_TRUE(estimator.GetRTTEstimate(&rtt));
EXPECT_TRUE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
// |network_quality| should be equal to the 50 percentile value.
EXPECT_TRUE(estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), 50) > 0);
EXPECT_TRUE(estimator.GetRTTEstimateInternal(base::TimeTicks(), 50) !=
NetworkQualityEstimator::InvalidRTT());
}
// Verifies that the percentiles are correctly computed. Observations have
// different timestamps with half the observations being very old and the rest
// of them being very recent. Percentiles should factor in recent observations
// much more heavily than older samples. Kbps percentiles must be in decreasing
// order. RTT percentiles must be in increasing order.
TEST(NetworkQualityEstimatorTest, PercentileDifferentTimestamps) {
std::map<std::string, std::string> variation_params;
TestNetworkQualityEstimator estimator(variation_params);
base::TimeTicks now = base::TimeTicks::Now();
base::TimeTicks very_old = base::TimeTicks::UnixEpoch();
// First 50 samples have very old timestamp.
for (int i = 1; i <= 50; ++i) {
estimator.downstream_throughput_kbps_observations_.AddObservation(
NetworkQualityEstimator::Observation(
i, very_old, NetworkQualityEstimator::URL_REQUEST));
estimator.rtt_msec_observations_.AddObservation(
NetworkQualityEstimator::Observation(
i, very_old, NetworkQualityEstimator::URL_REQUEST));
}
// Next 50 (i.e., from 51 to 100) have recent timestamp.
for (int i = 51; i <= 100; ++i) {
estimator.downstream_throughput_kbps_observations_.AddObservation(
NetworkQualityEstimator::Observation(
i, now, NetworkQualityEstimator::URL_REQUEST));
estimator.rtt_msec_observations_.AddObservation(
NetworkQualityEstimator::Observation(
i, now, NetworkQualityEstimator::URL_REQUEST));
}
// Older samples have very little weight. So, all percentiles are >= 51
// (lowest value among recent observations).
for (int i = 1; i < 100; ++i) {
// Checks if the difference between the two integers is less than 1. This is
// required because computed percentiles may be slightly different from
// what is expected due to floating point computation errors and integer
// rounding off errors.
EXPECT_NEAR(estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), i),
51 + 0.49 * (100 - i), 1);
EXPECT_NEAR(
estimator.GetRTTEstimateInternal(base::TimeTicks(), i).InMilliseconds(),
51 + 0.49 * i, 1);
}
EXPECT_EQ(NetworkQualityEstimator::InvalidRTT(),
estimator.GetRTTEstimateInternal(
base::TimeTicks::Now() + base::TimeDelta::FromMinutes(10), 50));
EXPECT_EQ(NetworkQualityEstimator::kInvalidThroughput,
estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks::Now() + base::TimeDelta::FromMinutes(10), 50));
}
// This test notifies NetworkQualityEstimator of received data. Next,
// throughput and RTT percentiles are checked for correctness by doing simple
// verifications.
TEST(NetworkQualityEstimatorTest, ComputedPercentiles) {
std::map<std::string, std::string> variation_params;
TestNetworkQualityEstimator estimator(variation_params);
EXPECT_EQ(NetworkQualityEstimator::InvalidRTT(),
estimator.GetRTTEstimateInternal(base::TimeTicks(), 100));
EXPECT_EQ(NetworkQualityEstimator::kInvalidThroughput,
estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), 100));
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
// Number of observations are more than the maximum buffer size.
for (size_t i = 0; i < estimator.kMaximumObservationsBufferSize + 100U; ++i) {
scoped_ptr<URLRequest> request(context.CreateRequest(
estimator.GetEchoURL(), DEFAULT_PRIORITY, &test_delegate));
request->Start();
base::RunLoop().Run();
}
// 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(), i),
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(), i),
estimator.GetRTTEstimateInternal(base::TimeTicks(), i - 1));
}
}
}
TEST(NetworkQualityEstimatorTest, ObtainOperatingParams) {
std::map<std::string, std::string> variation_params;
variation_params["Unknown.DefaultMedianKbps"] = "100";
variation_params["WiFi.DefaultMedianKbps"] = "200";
variation_params["2G.DefaultMedianKbps"] = "300";
variation_params["Unknown.DefaultMedianRTTMsec"] = "1000";
variation_params["WiFi.DefaultMedianRTTMsec"] = "2000";
// Negative variation value should not be used.
variation_params["2G.DefaultMedianRTTMsec"] = "-5";
TestNetworkQualityEstimator estimator(variation_params);
EXPECT_EQ(1U, estimator.downstream_throughput_kbps_observations_.Size());
EXPECT_EQ(1U, estimator.rtt_msec_observations_.Size());
base::TimeDelta rtt;
EXPECT_TRUE(estimator.GetRTTEstimate(&rtt));
int32_t kbps;
EXPECT_TRUE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
EXPECT_EQ(100, kbps);
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1000), rtt);
auto it =
estimator.downstream_throughput_kbps_observations_.observations_.begin();
EXPECT_EQ(100, (*it).value);
it = estimator.rtt_msec_observations_.observations_.begin();
EXPECT_EQ(1000, (*it).value);
// Simulate network change to Wi-Fi.
estimator.SimulateNetworkChangeTo(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test-1");
EXPECT_EQ(1U, estimator.downstream_throughput_kbps_observations_.Size());
EXPECT_EQ(1U, estimator.rtt_msec_observations_.Size());
EXPECT_TRUE(estimator.GetRTTEstimate(&rtt));
EXPECT_TRUE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
EXPECT_EQ(200, kbps);
EXPECT_EQ(base::TimeDelta::FromMilliseconds(2000), rtt);
it = estimator.downstream_throughput_kbps_observations_.observations_.begin();
EXPECT_EQ(200, (*it).value);
it = estimator.rtt_msec_observations_.observations_.begin();
EXPECT_EQ(2000, (*it).value);
// Peak network quality should not be affected by the network quality
// estimator field trial.
EXPECT_EQ(NetworkQualityEstimator::InvalidRTT(),
estimator.peak_network_quality_.rtt());
EXPECT_EQ(NetworkQualityEstimator::kInvalidThroughput,
estimator.peak_network_quality_.downstream_throughput_kbps());
// Simulate network change to 2G. Only the Kbps default estimate should be
// available.
estimator.SimulateNetworkChangeTo(
NetworkChangeNotifier::ConnectionType::CONNECTION_2G, "test-2");
EXPECT_EQ(1U, estimator.downstream_throughput_kbps_observations_.Size());
EXPECT_EQ(0U, estimator.rtt_msec_observations_.Size());
EXPECT_FALSE(estimator.GetRTTEstimate(&rtt));
EXPECT_TRUE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
it = estimator.downstream_throughput_kbps_observations_.observations_.begin();
EXPECT_EQ(300, (*it).value);
// Simulate network change to 3G. Default estimates should be unavailable.
estimator.SimulateNetworkChangeTo(
NetworkChangeNotifier::ConnectionType::CONNECTION_3G, "test-3");
EXPECT_FALSE(estimator.GetRTTEstimate(&rtt));
EXPECT_FALSE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
EXPECT_EQ(0U, estimator.downstream_throughput_kbps_observations_.Size());
EXPECT_EQ(0U, estimator.rtt_msec_observations_.Size());
}
TEST(NetworkQualityEstimatorTest, HalfLifeParam) {
// Verifies if |weight_multiplier_per_second_| is set to correct value for
// various values of half life parameter.
std::map<std::string, std::string> variation_params;
{
// Half life parameter is not set. Default value of
// |weight_multiplier_per_second_| should be used.
TestNetworkQualityEstimator estimator(variation_params);
EXPECT_NEAR(0.988, estimator.downstream_throughput_kbps_observations_
.weight_multiplier_per_second_,
0.001);
}
variation_params["HalfLifeSeconds"] = "-100";
{
// Half life parameter is set to a negative value. Default value of
// |weight_multiplier_per_second_| should be used.
TestNetworkQualityEstimator estimator(variation_params);
EXPECT_NEAR(0.988, estimator.downstream_throughput_kbps_observations_
.weight_multiplier_per_second_,
0.001);
}
variation_params["HalfLifeSeconds"] = "0";
{
// Half life parameter is set to zero. Default value of
// |weight_multiplier_per_second_| should be used.
TestNetworkQualityEstimator estimator(variation_params);
EXPECT_NEAR(0.988, estimator.downstream_throughput_kbps_observations_
.weight_multiplier_per_second_,
0.001);
}
variation_params["HalfLifeSeconds"] = "10";
{
// Half life parameter is set to a valid value.
TestNetworkQualityEstimator estimator(variation_params);
EXPECT_NEAR(0.933, estimator.downstream_throughput_kbps_observations_
.weight_multiplier_per_second_,
0.001);
}
}
// Test if the network estimates are cached when network change notification
// is invoked.
TEST(NetworkQualityEstimatorTest, TestCaching) {
std::map<std::string, std::string> variation_params;
TestNetworkQualityEstimator estimator(variation_params);
size_t expected_cache_size = 0;
EXPECT_EQ(expected_cache_size, estimator.cached_network_qualities_.size());
// Cache entry will not be added for (NONE, "").
estimator.downstream_throughput_kbps_observations_.AddObservation(
NetworkQualityEstimator::Observation(
1, base::TimeTicks::Now(), NetworkQualityEstimator::URL_REQUEST));
estimator.rtt_msec_observations_.AddObservation(
NetworkQualityEstimator::Observation(
1000, base::TimeTicks::Now(), NetworkQualityEstimator::URL_REQUEST));
estimator.SimulateNetworkChangeTo(
NetworkChangeNotifier::ConnectionType::CONNECTION_2G, "test-1");
EXPECT_EQ(expected_cache_size, estimator.cached_network_qualities_.size());
// Entry will be added for (2G, "test1").
// Also, set the network quality for (2G, "test1") so that it is stored in
// the cache.
estimator.downstream_throughput_kbps_observations_.AddObservation(
NetworkQualityEstimator::Observation(
1, base::TimeTicks::Now(), NetworkQualityEstimator::URL_REQUEST));
estimator.rtt_msec_observations_.AddObservation(
NetworkQualityEstimator::Observation(
1000, base::TimeTicks::Now(), NetworkQualityEstimator::URL_REQUEST));
estimator.SimulateNetworkChangeTo(
NetworkChangeNotifier::ConnectionType::CONNECTION_3G, "test-1");
++expected_cache_size;
EXPECT_EQ(expected_cache_size, estimator.cached_network_qualities_.size());
// Entry will be added for (3G, "test1").
// Also, set the network quality for (3G, "test1") so that it is stored in
// the cache.
estimator.downstream_throughput_kbps_observations_.AddObservation(
NetworkQualityEstimator::Observation(
2, base::TimeTicks::Now(), NetworkQualityEstimator::URL_REQUEST));
estimator.rtt_msec_observations_.AddObservation(
NetworkQualityEstimator::Observation(
500, base::TimeTicks::Now(), NetworkQualityEstimator::URL_REQUEST));
estimator.SimulateNetworkChangeTo(
NetworkChangeNotifier::ConnectionType::CONNECTION_3G, "test-2");
++expected_cache_size;
EXPECT_EQ(expected_cache_size, estimator.cached_network_qualities_.size());
// Entry will not be added for (3G, "test2").
estimator.SimulateNetworkChangeTo(
NetworkChangeNotifier::ConnectionType::CONNECTION_2G, "test-1");
EXPECT_EQ(expected_cache_size, estimator.cached_network_qualities_.size());
// Read the network quality for (2G, "test-1").
EXPECT_TRUE(estimator.ReadCachedNetworkQualityEstimate());
base::TimeDelta rtt;
int32_t kbps;
EXPECT_TRUE(estimator.GetRTTEstimate(&rtt));
EXPECT_TRUE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
EXPECT_EQ(1, kbps);
EXPECT_EQ(base::TimeDelta::FromMilliseconds(1000), rtt);
// No new entry should be added for (2G, "test-1") since it already exists
// in the cache.
estimator.SimulateNetworkChangeTo(
NetworkChangeNotifier::ConnectionType::CONNECTION_3G, "test-1");
EXPECT_EQ(expected_cache_size, estimator.cached_network_qualities_.size());
// Read the network quality for (3G, "test-1").
EXPECT_TRUE(estimator.ReadCachedNetworkQualityEstimate());
EXPECT_TRUE(estimator.GetRTTEstimate(&rtt));
EXPECT_TRUE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
EXPECT_EQ(2, kbps);
EXPECT_EQ(base::TimeDelta::FromMilliseconds(500), rtt);
// No new entry should be added for (3G, "test1") since it already exists
// in the cache.
estimator.SimulateNetworkChangeTo(
NetworkChangeNotifier::ConnectionType::CONNECTION_3G, "test-2");
EXPECT_EQ(expected_cache_size, estimator.cached_network_qualities_.size());
// Reading quality of (3G, "test-2") should return false.
EXPECT_FALSE(estimator.ReadCachedNetworkQualityEstimate());
// Reading quality of (2G, "test-3") should return false.
estimator.SimulateNetworkChangeTo(
NetworkChangeNotifier::ConnectionType::CONNECTION_2G, "test-3");
EXPECT_FALSE(estimator.ReadCachedNetworkQualityEstimate());
}
// Tests if the cache size remains bounded. Also, ensure that the cache is
// LRU.
TEST(NetworkQualityEstimatorTest, TestLRUCacheMaximumSize) {
std::map<std::string, std::string> variation_params;
TestNetworkQualityEstimator estimator(variation_params);
estimator.SimulateNetworkChangeTo(
net::NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI,
std::string());
EXPECT_EQ(0U, estimator.cached_network_qualities_.size());
// Add 100 more networks than the maximum size of the cache.
size_t network_count =
NetworkQualityEstimator::kMaximumNetworkQualityCacheSize + 100;
base::TimeTicks update_time_of_network_100;
for (size_t i = 0; i < network_count; ++i) {
estimator.downstream_throughput_kbps_observations_.AddObservation(
NetworkQualityEstimator::Observation(
2, base::TimeTicks::Now(), NetworkQualityEstimator::URL_REQUEST));
estimator.rtt_msec_observations_.AddObservation(
NetworkQualityEstimator::Observation(
500, base::TimeTicks::Now(), NetworkQualityEstimator::URL_REQUEST));
if (i == 100)
update_time_of_network_100 = base::TimeTicks::Now();
estimator.SimulateNetworkChangeTo(
net::NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI,
base::SizeTToString(i));
if (i < NetworkQualityEstimator::kMaximumNetworkQualityCacheSize)
EXPECT_EQ(i, estimator.cached_network_qualities_.size());
EXPECT_LE(estimator.cached_network_qualities_.size(),
static_cast<size_t>(
NetworkQualityEstimator::kMaximumNetworkQualityCacheSize));
}
// One more call so that the last network is also written to cache.
estimator.downstream_throughput_kbps_observations_.AddObservation(
NetworkQualityEstimator::Observation(
2, base::TimeTicks::Now(), NetworkQualityEstimator::URL_REQUEST));
estimator.rtt_msec_observations_.AddObservation(
NetworkQualityEstimator::Observation(
500, base::TimeTicks::Now(), NetworkQualityEstimator::URL_REQUEST));
estimator.SimulateNetworkChangeTo(
net::NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI,
base::SizeTToString(network_count - 1));
EXPECT_EQ(static_cast<size_t>(
NetworkQualityEstimator::kMaximumNetworkQualityCacheSize),
estimator.cached_network_qualities_.size());
// Test that the cache is LRU by examining its contents. Networks in cache
// must all be newer than the 100th network.
for (NetworkQualityEstimator::CachedNetworkQualities::iterator it =
estimator.cached_network_qualities_.begin();
it != estimator.cached_network_qualities_.end(); ++it) {
EXPECT_GE((it->second).last_update_time_, update_time_of_network_100);
}
}
TEST(NetworkQualityEstimatorTest, TestGetMedianRTTSince) {
std::map<std::string, std::string> variation_params;
TestNetworkQualityEstimator estimator(variation_params);
base::TimeTicks now = base::TimeTicks::Now();
base::TimeTicks old = now - base::TimeDelta::FromMilliseconds(1);
ASSERT_NE(old, now);
// First sample has very old timestamp.
estimator.downstream_throughput_kbps_observations_.AddObservation(
NetworkQualityEstimator::Observation(
1, old, NetworkQualityEstimator::URL_REQUEST));
estimator.rtt_msec_observations_.AddObservation(
NetworkQualityEstimator::Observation(
1, old, NetworkQualityEstimator::URL_REQUEST));
estimator.downstream_throughput_kbps_observations_.AddObservation(
NetworkQualityEstimator::Observation(
100, now, NetworkQualityEstimator::URL_REQUEST));
estimator.rtt_msec_observations_.AddObservation(
NetworkQualityEstimator::Observation(
100, now, NetworkQualityEstimator::URL_REQUEST));
base::TimeDelta rtt;
EXPECT_FALSE(estimator.GetRecentMedianRTT(
now + base::TimeDelta::FromSeconds(10), &rtt));
EXPECT_TRUE(estimator.GetRecentMedianRTT(now, &rtt));
EXPECT_EQ(100, rtt.InMilliseconds());
int32_t downstream_throughput_kbps;
EXPECT_FALSE(estimator.GetRecentMedianDownlinkThroughputKbps(
now + base::TimeDelta::FromSeconds(10), &downstream_throughput_kbps));
EXPECT_TRUE(estimator.GetRecentMedianDownlinkThroughputKbps(
now, &downstream_throughput_kbps));
EXPECT_EQ(100, downstream_throughput_kbps);
}
// An external estimate provider that does not have a valid RTT or throughput
// estimate.
class InvalidExternalEstimateProvider : public ExternalEstimateProvider {
public:
InvalidExternalEstimateProvider() : get_rtt_count_(0) {}
~InvalidExternalEstimateProvider() override {}
// ExternalEstimateProvider implementation:
bool GetRTT(base::TimeDelta* rtt) const override {
DCHECK(rtt);
get_rtt_count_++;
return false;
}
// ExternalEstimateProvider implementation:
bool GetDownstreamThroughputKbps(
int32_t* downstream_throughput_kbps) const override {
DCHECK(downstream_throughput_kbps);
return false;
}
// ExternalEstimateProvider implementation:
bool GetUpstreamThroughputKbps(
int32_t* upstream_throughput_kbps) const override {
// NetworkQualityEstimator does not support upstream throughput.
ADD_FAILURE();
return false;
}
// ExternalEstimateProvider implementation:
bool GetTimeSinceLastUpdate(
base::TimeDelta* time_since_last_update) const override {
*time_since_last_update = base::TimeDelta::FromMilliseconds(1);
return true;
}
// ExternalEstimateProvider implementation:
void SetUpdatedEstimateDelegate(UpdatedEstimateDelegate* delegate) override {}
// ExternalEstimateProvider implementation:
void Update() const override {}
size_t get_rtt_count() const { return get_rtt_count_; }
private:
// Keeps track of number of times different functions were called.
mutable size_t get_rtt_count_;
DISALLOW_COPY_AND_ASSIGN(InvalidExternalEstimateProvider);
};
// Tests if the RTT value from external estimate provider is discarded if the
// external estimate provider is invalid.
TEST(NetworkQualityEstimatorTest, InvalidExternalEstimateProvider) {
InvalidExternalEstimateProvider* invalid_external_estimate_provider =
new InvalidExternalEstimateProvider();
scoped_ptr<ExternalEstimateProvider> external_estimate_provider(
invalid_external_estimate_provider);
TestNetworkQualityEstimator estimator(std::map<std::string, std::string>(),
std::move(external_estimate_provider));
base::TimeDelta rtt;
int32_t kbps;
EXPECT_EQ(1U, invalid_external_estimate_provider->get_rtt_count());
EXPECT_FALSE(estimator.GetRTTEstimate(&rtt));
EXPECT_FALSE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
}
class TestExternalEstimateProvider : public ExternalEstimateProvider {
public:
TestExternalEstimateProvider(base::TimeDelta rtt,
int32_t downstream_throughput_kbps)
: rtt_(rtt),
downstream_throughput_kbps_(downstream_throughput_kbps),
time_since_last_update_(base::TimeDelta::FromSeconds(1)),
get_time_since_last_update_count_(0),
get_rtt_count_(0),
get_downstream_throughput_kbps_count_(0),
update_count_(0) {}
~TestExternalEstimateProvider() override {}
// ExternalEstimateProvider implementation:
bool GetRTT(base::TimeDelta* rtt) const override {
*rtt = rtt_;
get_rtt_count_++;
return true;
}
// ExternalEstimateProvider implementation:
bool GetDownstreamThroughputKbps(
int32_t* downstream_throughput_kbps) const override {
*downstream_throughput_kbps = downstream_throughput_kbps_;
get_downstream_throughput_kbps_count_++;
return true;
}
// ExternalEstimateProvider implementation:
bool GetUpstreamThroughputKbps(
int32_t* upstream_throughput_kbps) const override {
// NetworkQualityEstimator does not support upstream throughput.
ADD_FAILURE();
return false;
}
// ExternalEstimateProvider implementation:
bool GetTimeSinceLastUpdate(
base::TimeDelta* time_since_last_update) const override {
*time_since_last_update = time_since_last_update_;
get_time_since_last_update_count_++;
return true;
}
// ExternalEstimateProvider implementation:
void SetUpdatedEstimateDelegate(UpdatedEstimateDelegate* delegate) override {}
// ExternalEstimateProvider implementation:
void Update() const override { update_count_++; }
void set_time_since_last_update(base::TimeDelta time_since_last_update) {
time_since_last_update_ = time_since_last_update;
}
size_t get_time_since_last_update_count() const {
return get_time_since_last_update_count_;
}
size_t get_rtt_count() const { return get_rtt_count_; }
size_t get_downstream_throughput_kbps_count() const {
return get_downstream_throughput_kbps_count_;
}
size_t update_count() const { return update_count_; }
private:
// RTT and downstream throughput estimates.
const base::TimeDelta rtt_;
const int32_t downstream_throughput_kbps_;
base::TimeDelta time_since_last_update_;
// Keeps track of number of times different functions were called.
mutable size_t get_time_since_last_update_count_;
mutable size_t get_rtt_count_;
mutable size_t get_downstream_throughput_kbps_count_;
mutable size_t update_count_;
DISALLOW_COPY_AND_ASSIGN(TestExternalEstimateProvider);
};
// Tests if the external estimate provider is called in the constructor and
// on network change notification.
TEST(NetworkQualityEstimatorTest, TestExternalEstimateProvider) {
TestExternalEstimateProvider* test_external_estimate_provider =
new TestExternalEstimateProvider(base::TimeDelta::FromMilliseconds(1),
100);
scoped_ptr<ExternalEstimateProvider> external_estimate_provider(
test_external_estimate_provider);
std::map<std::string, std::string> variation_params;
TestNetworkQualityEstimator estimator(variation_params,
std::move(external_estimate_provider));
base::TimeDelta rtt;
int32_t kbps;
EXPECT_TRUE(estimator.GetRTTEstimate(&rtt));
EXPECT_TRUE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
EXPECT_EQ(
1U, test_external_estimate_provider->get_time_since_last_update_count());
EXPECT_EQ(1U, test_external_estimate_provider->get_rtt_count());
EXPECT_EQ(
1U,
test_external_estimate_provider->get_downstream_throughput_kbps_count());
// Change network type to WiFi. Number of queries to External estimate
// provider must increment.
estimator.SimulateNetworkChangeTo(
NetworkChangeNotifier::ConnectionType::CONNECTION_WIFI, "test-1");
EXPECT_TRUE(estimator.GetRTTEstimate(&rtt));
EXPECT_TRUE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
EXPECT_EQ(
2U, test_external_estimate_provider->get_time_since_last_update_count());
EXPECT_EQ(2U, test_external_estimate_provider->get_rtt_count());
EXPECT_EQ(
2U,
test_external_estimate_provider->get_downstream_throughput_kbps_count());
// Change network type to 2G. Number of queries to External estimate provider
// must increment.
estimator.SimulateNetworkChangeTo(
NetworkChangeNotifier::ConnectionType::CONNECTION_2G, "test-1");
EXPECT_EQ(
3U, test_external_estimate_provider->get_time_since_last_update_count());
EXPECT_EQ(3U, test_external_estimate_provider->get_rtt_count());
EXPECT_EQ(
3U,
test_external_estimate_provider->get_downstream_throughput_kbps_count());
// Set the external estimate as old. Network Quality estimator should request
// an update on connection type change.
EXPECT_EQ(0U, test_external_estimate_provider->update_count());
test_external_estimate_provider->set_time_since_last_update(
base::TimeDelta::Max());
estimator.SimulateNetworkChangeTo(
NetworkChangeNotifier::ConnectionType::CONNECTION_2G, "test-2");
EXPECT_EQ(
4U, test_external_estimate_provider->get_time_since_last_update_count());
EXPECT_EQ(3U, test_external_estimate_provider->get_rtt_count());
EXPECT_EQ(
3U,
test_external_estimate_provider->get_downstream_throughput_kbps_count());
EXPECT_EQ(1U, test_external_estimate_provider->update_count());
// Estimates are unavailable because external estimate provider never
// notifies network quality estimator of the updated estimates.
EXPECT_FALSE(estimator.GetRTTEstimate(&rtt));
EXPECT_FALSE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
}
// Tests if the estimate from the external estimate provider is merged with the
// observations collected from the HTTP requests.
TEST(NetworkQualityEstimatorTest, TestExternalEstimateProviderMergeEstimates) {
const base::TimeDelta external_estimate_provider_rtt =
base::TimeDelta::FromMilliseconds(1);
const int32_t external_estimate_provider_downstream_throughput = 100;
TestExternalEstimateProvider* test_external_estimate_provider =
new TestExternalEstimateProvider(
external_estimate_provider_rtt,
external_estimate_provider_downstream_throughput);
scoped_ptr<ExternalEstimateProvider> external_estimate_provider(
test_external_estimate_provider);
std::map<std::string, std::string> variation_params;
TestNetworkQualityEstimator estimator(variation_params,
std::move(external_estimate_provider));
base::TimeDelta rtt;
// Estimate provided by network quality estimator should match the estimate
// provided by external estimate provider.
EXPECT_TRUE(estimator.GetRTTEstimate(&rtt));
EXPECT_EQ(external_estimate_provider_rtt, rtt);
int32_t kbps;
EXPECT_TRUE(estimator.GetDownlinkThroughputKbpsEstimate(&kbps));
EXPECT_EQ(external_estimate_provider_downstream_throughput, kbps);
EXPECT_EQ(1U, estimator.rtt_msec_observations_.Size());
EXPECT_EQ(1U, estimator.downstream_throughput_kbps_observations_.Size());
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
scoped_ptr<URLRequest> request(context.CreateRequest(
estimator.GetEchoURL(), DEFAULT_PRIORITY, &test_delegate));
request->Start();
base::RunLoop().Run();
EXPECT_EQ(2U, estimator.rtt_msec_observations_.Size());
EXPECT_EQ(2U, estimator.downstream_throughput_kbps_observations_.Size());
}
TEST(NetworkQualityEstimatorTest, TestObservers) {
TestRTTObserver rtt_observer;
TestThroughputObserver throughput_observer;
std::map<std::string, std::string> variation_params;
TestNetworkQualityEstimator estimator(variation_params);
estimator.AddRTTObserver(&rtt_observer);
estimator.AddThroughputObserver(&throughput_observer);
TestDelegate test_delegate;
TestURLRequestContext context(true);
context.set_network_quality_estimator(&estimator);
context.Init();
EXPECT_EQ(0U, rtt_observer.observations().size());
EXPECT_EQ(0U, throughput_observer.observations().size());
base::TimeTicks then = base::TimeTicks::Now();
scoped_ptr<URLRequest> request(context.CreateRequest(
estimator.GetEchoURL(), DEFAULT_PRIORITY, &test_delegate));
request->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME);
request->Start();
base::RunLoop().Run();
scoped_ptr<URLRequest> request2(context.CreateRequest(
estimator.GetEchoURL(), DEFAULT_PRIORITY, &test_delegate));
request2->SetLoadFlags(request->load_flags() | LOAD_MAIN_FRAME);
request2->Start();
base::RunLoop().Run();
// Both RTT and downstream throughput should be updated.
EXPECT_NE(NetworkQualityEstimator::InvalidRTT(),
estimator.GetRTTEstimateInternal(base::TimeTicks(), 100));
EXPECT_NE(NetworkQualityEstimator::kInvalidThroughput,
estimator.GetDownlinkThroughputKbpsEstimateInternal(
base::TimeTicks(), 100));
EXPECT_EQ(2U, rtt_observer.observations().size());
EXPECT_EQ(2U, throughput_observer.observations().size());
for (auto observation : rtt_observer.observations()) {
EXPECT_LE(0, observation.rtt_ms);
EXPECT_LE(0, (observation.timestamp - then).InMilliseconds());
EXPECT_EQ(NetworkQualityEstimator::URL_REQUEST, observation.source);
}
for (auto observation : throughput_observer.observations()) {
EXPECT_LE(0, observation.throughput_kbps);
EXPECT_LE(0, (observation.timestamp - then).InMilliseconds());
EXPECT_EQ(NetworkQualityEstimator::URL_REQUEST, observation.source);
}
// Verify that observations from TCP and QUIC are passed on to the observers.
base::TimeDelta tcp_rtt(base::TimeDelta::FromMilliseconds(1));
base::TimeDelta quic_rtt(base::TimeDelta::FromMilliseconds(2));
scoped_ptr<SocketPerformanceWatcher> tcp_watcher =
estimator.CreateSocketPerformanceWatcher(
SocketPerformanceWatcherFactory::PROTOCOL_TCP);
scoped_ptr<SocketPerformanceWatcher> quic_watcher =
estimator.CreateSocketPerformanceWatcher(
SocketPerformanceWatcherFactory::PROTOCOL_QUIC);
tcp_watcher->OnUpdatedRTTAvailable(tcp_rtt);
quic_watcher->OnUpdatedRTTAvailable(quic_rtt);
EXPECT_EQ(4U, rtt_observer.observations().size());
EXPECT_EQ(2U, throughput_observer.observations().size());
EXPECT_EQ(tcp_rtt.InMilliseconds(), rtt_observer.observations().at(2).rtt_ms);
EXPECT_EQ(quic_rtt.InMilliseconds(),
rtt_observer.observations().at(3).rtt_ms);
}
} // namespace net
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