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throughput_analyzer_unittest.cc
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throughput_analyzer_unittest.cc
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// Copyright 2016 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/throughput_analyzer.h"
#include <stdint.h>
#include <deque>
#include <map>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/memory/ptr_util.h"
#include "base/run_loop.h"
#include "base/single_thread_task_runner.h"
#include "base/strings/string_number_conversions.h"
#include "base/threading/thread_task_runner_handle.h"
#include "net/dns/mock_host_resolver.h"
#include "net/log/test_net_log.h"
#include "net/nqe/network_quality_estimator_params.h"
#include "net/nqe/network_quality_estimator_util.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"
namespace net {
namespace nqe {
namespace {
class TestThroughputAnalyzer : public internal::ThroughputAnalyzer {
public:
explicit TestThroughputAnalyzer(NetworkQualityEstimatorParams* params)
: internal::ThroughputAnalyzer(
params,
base::ThreadTaskRunnerHandle::Get(),
base::Bind(
&TestThroughputAnalyzer::OnNewThroughputObservationAvailable,
base::Unretained(this)),
false,
false,
base::MakeUnique<BoundTestNetLog>()->bound()),
throughput_observations_received_(0),
bits_received_(0) {}
~TestThroughputAnalyzer() override {}
int32_t throughput_observations_received() const {
return throughput_observations_received_;
}
void OnNewThroughputObservationAvailable(int32_t downstream_kbps) {
throughput_observations_received_++;
}
int64_t GetBitsReceived() const override { return bits_received_; }
void IncrementBitsReceived(int64_t additional_bits_received) {
bits_received_ += additional_bits_received;
}
// Uses a mock resolver to force example.com to resolve to a public IP
// address.
void AddIPAddressResolution(TestURLRequestContext* context) {
scoped_refptr<net::RuleBasedHostResolverProc> rules(
new net::RuleBasedHostResolverProc(nullptr));
// example1.com resolves to a public IP address.
rules->AddRule("example.com", "27.0.0.3");
mock_host_resolver_.set_rules(rules.get());
context->set_host_resolver(&mock_host_resolver_);
}
using internal::ThroughputAnalyzer::disable_throughput_measurements;
private:
int throughput_observations_received_;
int64_t bits_received_;
MockCachingHostResolver mock_host_resolver_;
DISALLOW_COPY_AND_ASSIGN(TestThroughputAnalyzer);
};
TEST(ThroughputAnalyzerTest, MaximumRequests) {
const struct {
bool use_local_requests;
} tests[] = {{
false,
},
{
true,
}};
for (const auto& test : tests) {
std::map<std::string, std::string> variation_params;
NetworkQualityEstimatorParams params(variation_params);
TestThroughputAnalyzer throughput_analyzer(¶ms);
TestDelegate test_delegate;
TestURLRequestContext context;
throughput_analyzer.AddIPAddressResolution(&context);
ASSERT_FALSE(throughput_analyzer.disable_throughput_measurements());
std::deque<std::unique_ptr<URLRequest>> requests;
// Start more requests than the maximum number of requests that can be held
// in the memory.
const std::string url = test.use_local_requests
? "http://127.0.0.1/test.html"
: "http://example.com/test.html";
EXPECT_EQ(
test.use_local_requests,
nqe::internal::IsPrivateHost(
context.host_resolver(),
HostPortPair(GURL(url).host(), GURL(url).EffectiveIntPort())));
for (size_t i = 0; i < 1000; ++i) {
std::unique_ptr<URLRequest> request(
context.CreateRequest(GURL(url), DEFAULT_PRIORITY, &test_delegate,
TRAFFIC_ANNOTATION_FOR_TESTS));
throughput_analyzer.NotifyStartTransaction(*(request.get()));
requests.push_back(std::move(request));
}
// Too many local requests should cause the |throughput_analyzer| to disable
// throughput measurements.
EXPECT_NE(test.use_local_requests,
throughput_analyzer.IsCurrentlyTrackingThroughput());
}
}
// Tests if the throughput observation is taken correctly when local and network
// requests overlap.
TEST(ThroughputAnalyzerTest, TestThroughputWithMultipleRequestsOverlap) {
static const struct {
bool start_local_request;
bool local_request_completes_first;
bool expect_throughput_observation;
} tests[] = {
{
false, false, true,
},
{
true, false, false,
},
{
true, true, true,
},
};
for (const auto& test : tests) {
// Localhost requests are not allowed for estimation purposes.
std::map<std::string, std::string> variation_params;
NetworkQualityEstimatorParams params(variation_params);
TestThroughputAnalyzer throughput_analyzer(¶ms);
TestDelegate test_delegate;
TestURLRequestContext context;
throughput_analyzer.AddIPAddressResolution(&context);
std::unique_ptr<URLRequest> request_local;
std::unique_ptr<URLRequest> request_not_local(context.CreateRequest(
GURL("http://example.com/echo.html"), DEFAULT_PRIORITY, &test_delegate,
TRAFFIC_ANNOTATION_FOR_TESTS));
request_not_local->Start();
if (test.start_local_request) {
request_local = context.CreateRequest(GURL("http://127.0.0.1/echo.html"),
DEFAULT_PRIORITY, &test_delegate,
TRAFFIC_ANNOTATION_FOR_TESTS);
request_local->Start();
}
base::RunLoop().Run();
EXPECT_EQ(0, throughput_analyzer.throughput_observations_received());
// If |test.start_local_request| is true, then |request_local| starts
// before |request_not_local|, and ends after |request_not_local|. Thus,
// network quality estimator should not get a chance to record throughput
// observation from |request_not_local| because of ongoing local request
// at all times.
if (test.start_local_request)
throughput_analyzer.NotifyStartTransaction(*request_local);
throughput_analyzer.NotifyStartTransaction(*request_not_local);
if (test.local_request_completes_first) {
ASSERT_TRUE(test.start_local_request);
throughput_analyzer.NotifyRequestCompleted(*request_local);
}
// Increment the bytes received count to emulate the bytes received for
// |request_local| and |request_not_local|.
throughput_analyzer.IncrementBitsReceived(100 * 1000 * 8);
throughput_analyzer.NotifyRequestCompleted(*request_not_local);
if (test.start_local_request && !test.local_request_completes_first)
throughput_analyzer.NotifyRequestCompleted(*request_local);
base::RunLoop().RunUntilIdle();
int expected_throughput_observations =
test.expect_throughput_observation ? 1 : 0;
EXPECT_EQ(expected_throughput_observations,
throughput_analyzer.throughput_observations_received());
}
}
// Tests if the throughput observation is taken correctly when two network
// requests overlap.
TEST(ThroughputAnalyzerTest, TestThroughputWithNetworkRequestsOverlap) {
static const struct {
size_t throughput_min_requests_in_flight;
size_t number_requests_in_flight;
int64_t increment_bits;
bool expect_throughput_observation;
} tests[] = {
{
1, 2, 100 * 1000 * 8, true,
},
{
3, 1, 100 * 1000 * 8, false,
},
{
3, 2, 100 * 1000 * 8, false,
},
{
3, 3, 100 * 1000 * 8, true,
},
{
3, 4, 100 * 1000 * 8, true,
},
{
1, 2, 1, false,
},
};
for (const auto& test : tests) {
// Localhost requests are not allowed for estimation purposes.
std::map<std::string, std::string> variation_params;
variation_params["throughput_min_requests_in_flight"] =
base::IntToString(test.throughput_min_requests_in_flight);
NetworkQualityEstimatorParams params(variation_params);
TestThroughputAnalyzer throughput_analyzer(¶ms);
TestDelegate test_delegate;
TestURLRequestContext context;
throughput_analyzer.AddIPAddressResolution(&context);
EXPECT_EQ(0, throughput_analyzer.throughput_observations_received());
std::vector<std::unique_ptr<URLRequest>> requests_in_flight;
for (size_t i = 0; i < test.number_requests_in_flight; ++i) {
std::unique_ptr<URLRequest> request_network_1 = context.CreateRequest(
GURL("http://example.com/echo.html"), DEFAULT_PRIORITY,
&test_delegate, TRAFFIC_ANNOTATION_FOR_TESTS);
requests_in_flight.push_back(std::move(request_network_1));
requests_in_flight.back()->Start();
}
base::RunLoop().Run();
EXPECT_EQ(0, throughput_analyzer.throughput_observations_received());
for (size_t i = 0; i < test.number_requests_in_flight; ++i) {
URLRequest* request = requests_in_flight.at(i).get();
throughput_analyzer.NotifyStartTransaction(*request);
}
// Increment the bytes received count to emulate the bytes received for
// |request_network_1| and |request_network_2|.
throughput_analyzer.IncrementBitsReceived(test.increment_bits);
for (size_t i = 0; i < test.number_requests_in_flight; ++i) {
URLRequest* request = requests_in_flight.at(i).get();
throughput_analyzer.NotifyRequestCompleted(*request);
}
base::RunLoop().RunUntilIdle();
// Only one observation should be taken since two requests overlap.
if (test.expect_throughput_observation) {
EXPECT_EQ(1, throughput_analyzer.throughput_observations_received());
} else {
EXPECT_EQ(0, throughput_analyzer.throughput_observations_received());
}
}
}
// Tests if the throughput observation is taken correctly when the start and end
// of network requests overlap, and the minimum number of in flight requests
// when taking an observation is more than 1.
TEST(ThroughputAnalyzerTest, TestThroughputWithMultipleNetworkRequests) {
std::map<std::string, std::string> variation_params;
variation_params["throughput_min_requests_in_flight"] = "3";
NetworkQualityEstimatorParams params(variation_params);
TestThroughputAnalyzer throughput_analyzer(¶ms);
TestDelegate test_delegate;
TestURLRequestContext context;
throughput_analyzer.AddIPAddressResolution(&context);
EXPECT_EQ(0, throughput_analyzer.throughput_observations_received());
std::unique_ptr<URLRequest> request_1 = context.CreateRequest(
GURL("http://example.com/echo.html"), DEFAULT_PRIORITY, &test_delegate,
TRAFFIC_ANNOTATION_FOR_TESTS);
std::unique_ptr<URLRequest> request_2 = context.CreateRequest(
GURL("http://example.com/echo.html"), DEFAULT_PRIORITY, &test_delegate,
TRAFFIC_ANNOTATION_FOR_TESTS);
std::unique_ptr<URLRequest> request_3 = context.CreateRequest(
GURL("http://example.com/echo.html"), DEFAULT_PRIORITY, &test_delegate,
TRAFFIC_ANNOTATION_FOR_TESTS);
std::unique_ptr<URLRequest> request_4 = context.CreateRequest(
GURL("http://example.com/echo.html"), DEFAULT_PRIORITY, &test_delegate,
TRAFFIC_ANNOTATION_FOR_TESTS);
request_1->Start();
request_2->Start();
request_3->Start();
request_4->Start();
base::RunLoop().Run();
EXPECT_EQ(0, throughput_analyzer.throughput_observations_received());
throughput_analyzer.NotifyStartTransaction(*(request_1.get()));
throughput_analyzer.NotifyStartTransaction(*(request_2.get()));
const size_t increment_bits = 100 * 1000 * 8;
// Increment the bytes received count to emulate the bytes received for
// |request_1| and |request_2|.
throughput_analyzer.IncrementBitsReceived(increment_bits);
throughput_analyzer.NotifyRequestCompleted(*(request_1.get()));
base::RunLoop().RunUntilIdle();
// No observation should be taken since only 1 request is in flight.
EXPECT_EQ(0, throughput_analyzer.throughput_observations_received());
throughput_analyzer.NotifyStartTransaction(*(request_3.get()));
throughput_analyzer.NotifyStartTransaction(*(request_4.get()));
EXPECT_EQ(0, throughput_analyzer.throughput_observations_received());
// 3 requests are in flight which is at least as many as the minimum number of
// in flight requests required. An observation should be taken.
throughput_analyzer.IncrementBitsReceived(increment_bits);
// Only one observation should be taken since two requests overlap.
throughput_analyzer.NotifyRequestCompleted(*(request_2.get()));
base::RunLoop().RunUntilIdle();
EXPECT_EQ(1, throughput_analyzer.throughput_observations_received());
throughput_analyzer.NotifyRequestCompleted(*(request_3.get()));
throughput_analyzer.NotifyRequestCompleted(*(request_4.get()));
EXPECT_EQ(1, throughput_analyzer.throughput_observations_received());
}
} // namespace
} // namespace nqe
} // namespace net