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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <string>
#include "base/metrics/field_trial_param_associator.h"
#include "base/check.h"
#include "base/functional/bind.h"
#include "base/notreached.h"
#include "base/run_loop.h"
#include "base/test/scoped_feature_list.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/browser_process_impl.h"
#include "chrome/browser/chrome_content_browser_client.h"
#include "chrome/browser/net/system_network_context_manager.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/browser/ui/tabs/tab_strip_model.h"
#include "chrome/test/base/in_process_browser_test.h"
#include "chrome/test/base/ui_test_utils.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/navigation_entry.h"
#include "content/public/browser/network_service_instance.h"
#include "content/public/common/content_features.h"
#include "content/public/test/browser_test.h"
#include "content/public/test/browser_test_base.h"
#include "content/public/test/browser_test_utils.h"
#include "net/nqe/effective_connection_type.h"
#include "net/nqe/network_quality_estimator.h"
#include "net/test/embedded_test_server/embedded_test_server.h"
#include "services/network/network_service.h"
#include "services/network/public/cpp/features.h"
#include "services/network/public/cpp/network_quality_tracker.h"
// Tests if the save data header holdback works as expected.
class NetInfoNetworkQualityEstimatorHoldbackBrowserTest
: public InProcessBrowserTest,
public testing::WithParamInterface<bool> {
protected:
NetInfoNetworkQualityEstimatorHoldbackBrowserTest() {
ConfigureHoldbackExperiment();
}
void SetUp() override {
test_server_.ServeFilesFromSourceDirectory(GetChromeTestDataDir());
ASSERT_TRUE(test_server_.Start());
InProcessBrowserTest::SetUp();
}
void VerifyNetworkQualityNetInfoWebAPI(
const std::string& expected_effective_connection_type) {
ASSERT_TRUE(ui_test_utils::NavigateToURL(
browser(), test_server_.GetURL("/net_info.html")));
content::NavigationEntry* entry =
GetWebContents()->GetController().GetVisibleEntry();
EXPECT_EQ(content::PAGE_TYPE_NORMAL, entry->GetPageType());
EXPECT_EQ(expected_effective_connection_type,
RunScriptExtractString("getEffectiveType()"));
if (expected_effective_connection_type == "slow-2g") {
VerifyRtt(base::Milliseconds(3600), RunScriptExtractDouble("getRtt()"));
VerifyDownlinkKbps(40, RunScriptExtractDouble("getDownlink()") * 1000);
} else if (expected_effective_connection_type == "2g") {
VerifyRtt(base::Milliseconds(1800), RunScriptExtractDouble("getRtt()"));
VerifyDownlinkKbps(75, RunScriptExtractDouble("getDownlink()") * 1000);
} else if (expected_effective_connection_type == "3g") {
VerifyRtt(base::Milliseconds(450), RunScriptExtractDouble("getRtt()"));
VerifyDownlinkKbps(400, RunScriptExtractDouble("getDownlink()") * 1000);
} else if (expected_effective_connection_type == "4g") {
VerifyRtt(base::Milliseconds(175), RunScriptExtractDouble("getRtt()"));
VerifyDownlinkKbps(1600, RunScriptExtractDouble("getDownlink()") * 1000);
} else {
DCHECK(false);
}
}
void ConfigureHoldbackExperiment() {
std::map<std::string, std::string> params;
if (GetParam()) {
params["web_effective_connection_type_override"] = "2G";
}
scoped_feature_list_.InitAndEnableFeatureWithParameters(
features::kNetworkQualityEstimatorWebHoldback, params);
}
// Simulates a network quality change.
void SimulateNetworkQualityChange(net::EffectiveConnectionType type) {
g_browser_process->network_quality_tracker()
->ReportEffectiveConnectionTypeForTesting(type);
// Values taken from net/nqe/network_quality_estimator_params.h.
// TODO(tbansal): Declare the values in a common place, and read
// them directly.
if (type == net::EFFECTIVE_CONNECTION_TYPE_3G) {
g_browser_process->network_quality_tracker()
->ReportRTTsAndThroughputForTesting(base::Milliseconds(450), 400);
} else if (type == net::EFFECTIVE_CONNECTION_TYPE_SLOW_2G) {
g_browser_process->network_quality_tracker()
->ReportRTTsAndThroughputForTesting(base::Milliseconds(3600), 40);
} else {
NOTREACHED();
}
}
private:
content::WebContents* GetWebContents() const {
return browser()->tab_strip_model()->GetActiveWebContents();
}
void VerifyRtt(base::TimeDelta expected_rtt, int32_t got_rtt_milliseconds) {
EXPECT_EQ(0, got_rtt_milliseconds % 50)
<< " got_rtt_milliseconds=" << got_rtt_milliseconds;
if (expected_rtt > base::Milliseconds(3000))
expected_rtt = base::Milliseconds(3000);
// The difference between the actual and the estimate value should be within
// 10%. Add 50 (bucket size used in Blink) to account for the cases when the
// sample may spill over to the next bucket due to the added noise of 10%.
// For example, if sample is 300 msec, after adding noise, it may become
// 330, and after rounding off, it would spill over to the next bucket of
// 350 msec.
EXPECT_GE((expected_rtt.InMilliseconds() * 0.1) + 50,
std::abs(expected_rtt.InMilliseconds() - got_rtt_milliseconds));
}
void VerifyDownlinkKbps(double expected_kbps, double got_kbps) {
// First verify that |got_kbps| is a multiple of 50.
int quotient = static_cast<int>(got_kbps / 50);
// |mod| is the remainder left after dividing |got_kbps| by 50 while
// restricting the quotient to integer. For example, if |got_kbps| is
// 1050, then mod will be 0. If |got_kbps| is 1030, mod will be 30.
double mod = got_kbps - 50 * quotient;
EXPECT_LE(0.0, mod);
EXPECT_GT(50.0, mod);
// It is possible that |mod| is not exactly 0 because of floating point
// computations. e.g., |got_kbps| may be 99.999999, in which case |mod|
// will be 49.999999.
EXPECT_TRUE(mod < (1e-5) || (50 - mod) < 1e-5) << " got_kbps=" << got_kbps;
if (expected_kbps > 10000)
expected_kbps = 10000;
// The difference between the actual and the estimate value should be within
// 10%. Add 50 (bucket size used in Blink) to account for the cases when the
// sample may spill over to the next bucket due to the added noise of 10%.
// For example, if sample is 300 kbps, after adding noise, it may become
// 330, and after rounding off, it would spill over to the next bucket of
// 350 kbps.
EXPECT_GE((expected_kbps * 0.1) + 50, std::abs(expected_kbps - got_kbps));
}
std::string RunScriptExtractString(const std::string& script) {
return content::EvalJs(browser()->tab_strip_model()->GetActiveWebContents(),
script)
.ExtractString();
}
double RunScriptExtractDouble(const std::string& script) {
return content::EvalJs(browser()->tab_strip_model()->GetActiveWebContents(),
script)
.ExtractDouble();
}
int RunScriptExtractInt(const std::string& script) {
return content::EvalJs(browser()->tab_strip_model()->GetActiveWebContents(),
script)
.ExtractInt();
}
net::EmbeddedTestServer test_server_;
base::test::ScopedFeatureList scoped_feature_list_;
};
// Make sure the changes in the effective connection typeare notified to the
// render thread.
IN_PROC_BROWSER_TEST_P(NetInfoNetworkQualityEstimatorHoldbackBrowserTest,
EffectiveConnectionTypeChangeNotified) {
SimulateNetworkQualityChange(net::EFFECTIVE_CONNECTION_TYPE_3G);
base::RunLoop().RunUntilIdle();
EXPECT_TRUE(embedded_test_server()->Start());
ASSERT_TRUE(ui_test_utils::NavigateToURL(
browser(), embedded_test_server()->GetURL("/net_info.html")));
if (GetParam()) {
// ConfigureHoldbackExperiment() sets holdback ECT to 2G.
VerifyNetworkQualityNetInfoWebAPI("2g");
} else {
VerifyNetworkQualityNetInfoWebAPI("3g");
}
SimulateNetworkQualityChange(net::EFFECTIVE_CONNECTION_TYPE_SLOW_2G);
base::RunLoop().RunUntilIdle();
if (GetParam()) {
// ConfigureHoldbackExperiment() sets holdback ECT to 2G.
VerifyNetworkQualityNetInfoWebAPI("2g");
} else {
VerifyNetworkQualityNetInfoWebAPI("slow-2g");
}
}
// The network quality estimator web holdback is enabled only if the first
// param is true.
INSTANTIATE_TEST_SUITE_P(All,
NetInfoNetworkQualityEstimatorHoldbackBrowserTest,
testing::Bool());
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