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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 <memory>
#include "base/check_op.h"
#include "base/functional/bind.h"
#include "base/memory/raw_ptr.h"
#include "base/run_loop.h"
#include "base/task/deferred_sequenced_task_runner.h"
#include "base/task/sequenced_task_runner.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/profiles/profile.h"
#include "chrome/browser/ui/browser.h"
#include "chrome/test/base/in_process_browser_test.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/network_service_instance.h"
#include "content/public/browser/network_service_util.h"
#include "content/public/browser/storage_partition.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 "mojo/public/cpp/bindings/remote.h"
#include "mojo/public/cpp/bindings/sync_call_restrictions.h"
#include "net/nqe/effective_connection_type.h"
#include "net/nqe/network_quality_estimator.h"
#include "services/network/network_service.h"
#include "services/network/public/cpp/features.h"
#include "services/network/public/cpp/network_quality_tracker.h"
#include "services/network/public/mojom/network_service_test.mojom.h"
namespace network {
namespace {
// Simulates a network quality change. This is only called when network service
// is running in the browser process, in which case, the network quality
// estimator lives on the network thread.
void SimulateNetworkQualityChangeOnNetworkThread(
net::EffectiveConnectionType type) {
network::NetworkService::GetNetworkServiceForTesting()
->network_quality_estimator()
->SimulateNetworkQualityChangeForTesting(type);
base::RunLoop().RunUntilIdle();
}
class TestNetworkQualityObserver
: public NetworkQualityTracker::EffectiveConnectionTypeObserver {
public:
explicit TestNetworkQualityObserver(NetworkQualityTracker* tracker)
: num_notifications_(0),
run_loop_wait_effective_connection_type_(
net::EFFECTIVE_CONNECTION_TYPE_UNKNOWN),
run_loop_(std::make_unique<base::RunLoop>()),
tracker_(tracker),
effective_connection_type_(net::EFFECTIVE_CONNECTION_TYPE_UNKNOWN) {
tracker_->AddEffectiveConnectionTypeObserver(this);
}
TestNetworkQualityObserver(const TestNetworkQualityObserver&) = delete;
TestNetworkQualityObserver& operator=(const TestNetworkQualityObserver&) =
delete;
~TestNetworkQualityObserver() override {
tracker_->RemoveEffectiveConnectionTypeObserver(this);
}
// NetworkQualityTracker::EffectiveConnectionTypeObserver implementation:
void OnEffectiveConnectionTypeChanged(
net::EffectiveConnectionType type) override {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
net::EffectiveConnectionType queried_type =
tracker_->GetEffectiveConnectionType();
EXPECT_EQ(type, queried_type);
num_notifications_++;
effective_connection_type_ = type;
if (effective_connection_type_ != run_loop_wait_effective_connection_type_)
return;
run_loop_->Quit();
}
void WaitForNotification(
net::EffectiveConnectionType run_loop_wait_effective_connection_type) {
if (effective_connection_type_ == run_loop_wait_effective_connection_type)
return;
ASSERT_NE(net::EFFECTIVE_CONNECTION_TYPE_UNKNOWN,
run_loop_wait_effective_connection_type);
run_loop_wait_effective_connection_type_ =
run_loop_wait_effective_connection_type;
run_loop_->Run();
run_loop_ = std::make_unique<base::RunLoop>();
}
size_t num_notifications() const { return num_notifications_; }
net::EffectiveConnectionType effective_connection_type() const {
return effective_connection_type_;
}
base::TimeDelta http_rtt() const { return tracker_->GetHttpRTT(); }
base::TimeDelta transport_rtt() const { return tracker_->GetTransportRTT(); }
int32_t downlink_bandwidth_kbps() const {
return tracker_->GetDownstreamThroughputKbps();
}
private:
size_t num_notifications_;
net::EffectiveConnectionType run_loop_wait_effective_connection_type_;
std::unique_ptr<base::RunLoop> run_loop_;
raw_ptr<NetworkQualityTracker> tracker_;
net::EffectiveConnectionType effective_connection_type_;
};
} // namespace
class NetworkQualityTrackerBrowserTest : public InProcessBrowserTest {
public:
NetworkQualityTrackerBrowserTest() = default;
~NetworkQualityTrackerBrowserTest() override = default;
// Simulates a network quality change.
void SimulateNetworkQualityChange(net::EffectiveConnectionType type) {
if (!content::IsOutOfProcessNetworkService()) {
scoped_refptr<base::SequencedTaskRunner> task_runner =
content::GetIOThreadTaskRunner({});
if (content::IsInProcessNetworkService())
task_runner = content::GetNetworkTaskRunner();
task_runner->PostTask(
FROM_HERE,
base::BindOnce(&SimulateNetworkQualityChangeOnNetworkThread, type));
return;
}
mojo::ScopedAllowSyncCallForTesting allow_sync_call;
content::StoragePartition* partition =
browser()->profile()->GetDefaultStoragePartition();
DCHECK(partition->GetNetworkContext());
DCHECK(content::GetNetworkService());
mojo::Remote<network::mojom::NetworkServiceTest> network_service_test;
content::GetNetworkService()->BindTestInterfaceForTesting(
network_service_test.BindNewPipeAndPassReceiver());
base::RunLoop run_loop;
network_service_test->SimulateNetworkQualityChange(
type, base::BindOnce([](base::RunLoop* run_loop) { run_loop->Quit(); },
base::Unretained(&run_loop)));
run_loop.Run();
}
};
// Basic test to make sure NetworkQualityTracker is set up, and observers are
// notified.
IN_PROC_BROWSER_TEST_F(NetworkQualityTrackerBrowserTest,
NetworkQualityTracker) {
// Change the network quality to UNKNOWN to prevent any spurious
// notifications.
SimulateNetworkQualityChange(net::EFFECTIVE_CONNECTION_TYPE_UNKNOWN);
base::RunLoop().RunUntilIdle();
NetworkQualityTracker* tracker = g_browser_process->network_quality_tracker();
EXPECT_NE(nullptr, tracker);
base::RunLoop run_loop;
SimulateNetworkQualityChange(net::EFFECTIVE_CONNECTION_TYPE_4G);
TestNetworkQualityObserver network_quality_observer(tracker);
network_quality_observer.WaitForNotification(
net::EFFECTIVE_CONNECTION_TYPE_4G);
EXPECT_EQ(net::EFFECTIVE_CONNECTION_TYPE_4G,
network_quality_observer.effective_connection_type());
SimulateNetworkQualityChange(net::EFFECTIVE_CONNECTION_TYPE_3G);
network_quality_observer.WaitForNotification(
net::EFFECTIVE_CONNECTION_TYPE_3G);
EXPECT_EQ(net::EFFECTIVE_CONNECTION_TYPE_3G,
network_quality_observer.effective_connection_type());
base::RunLoop().RunUntilIdle();
// Verify that not too many effective connection type observations are
// received. Note that setting the effective connection type to UNKNOWN above,
// and adding the observer is racy. In some cases, the observer may receiver
// the notification about effective connection type being UNKNOWN, followed
// by other notifications.
EXPECT_LE(1u, network_quality_observer.num_notifications());
EXPECT_GE(5u, network_quality_observer.num_notifications());
// Typical RTT and downlink values when effective connection type is 3G. Taken
// from net::NetworkQualityEstimatorParams.
EXPECT_EQ(base::Milliseconds(450), network_quality_observer.http_rtt());
EXPECT_EQ(base::Milliseconds(400), network_quality_observer.transport_rtt());
EXPECT_EQ(400, network_quality_observer.downlink_bandwidth_kbps());
}
// Basic test to make sure NetworkQualityTracker is set up, and clients are
// notified as soon as they request notifications from the
// NetworkQualityEstimatorManager.
IN_PROC_BROWSER_TEST_F(NetworkQualityTrackerBrowserTest,
NetworkQualityTrackerNotifiedOnInitialization) {
SimulateNetworkQualityChange(net::EFFECTIVE_CONNECTION_TYPE_2G);
base::RunLoop().RunUntilIdle();
NetworkQualityTracker* tracker = g_browser_process->network_quality_tracker();
EXPECT_NE(nullptr, tracker);
base::RunLoop run_loop;
TestNetworkQualityObserver network_quality_observer(tracker);
network_quality_observer.WaitForNotification(
net::EFFECTIVE_CONNECTION_TYPE_2G);
EXPECT_EQ(net::EFFECTIVE_CONNECTION_TYPE_2G,
network_quality_observer.effective_connection_type());
// Typical RTT and downlink values when effective connection type is 2G. Taken
// from net::NetworkQualityEstimatorParams.
EXPECT_EQ(base::Milliseconds(1800), network_quality_observer.http_rtt());
EXPECT_EQ(base::Milliseconds(1500), network_quality_observer.transport_rtt());
EXPECT_EQ(75, network_quality_observer.downlink_bandwidth_kbps());
}
// Simulates a network service crash, and ensures that network quality estimate
// manager binds to the restarted network service.
IN_PROC_BROWSER_TEST_F(NetworkQualityTrackerBrowserTest,
SimulateNetworkServiceCrash) {
// Network service is not running out of process, so cannot be crashed.
if (!content::IsOutOfProcessNetworkService())
return;
// Change the network quality to UNKNOWN to prevent any spurious
// notifications.
SimulateNetworkQualityChange(net::EFFECTIVE_CONNECTION_TYPE_UNKNOWN);
base::RunLoop().RunUntilIdle();
NetworkQualityTracker* tracker = g_browser_process->network_quality_tracker();
EXPECT_NE(nullptr, tracker);
base::RunLoop run_loop;
TestNetworkQualityObserver network_quality_observer(tracker);
EXPECT_EQ(net::EFFECTIVE_CONNECTION_TYPE_UNKNOWN,
network_quality_observer.effective_connection_type());
SimulateNetworkQualityChange(net::EFFECTIVE_CONNECTION_TYPE_3G);
network_quality_observer.WaitForNotification(
net::EFFECTIVE_CONNECTION_TYPE_3G);
EXPECT_EQ(net::EFFECTIVE_CONNECTION_TYPE_3G,
network_quality_observer.effective_connection_type());
base::RunLoop().RunUntilIdle();
EXPECT_EQ(1u, network_quality_observer.num_notifications());
// Typical RTT and downlink values when effective connection type is 3G. Taken
// from net::NetworkQualityEstimatorParams.
EXPECT_EQ(base::Milliseconds(450), network_quality_observer.http_rtt());
EXPECT_EQ(base::Milliseconds(400), network_quality_observer.transport_rtt());
EXPECT_EQ(400, network_quality_observer.downlink_bandwidth_kbps());
SimulateNetworkServiceCrash();
// Flush the network interface to make sure it notices the crash.
browser()
->profile()
->GetDefaultStoragePartition()
->FlushNetworkInterfaceForTesting();
base::RunLoop().RunUntilIdle();
SimulateNetworkQualityChange(net::EFFECTIVE_CONNECTION_TYPE_2G);
network_quality_observer.WaitForNotification(
net::EFFECTIVE_CONNECTION_TYPE_2G);
EXPECT_LE(2u, network_quality_observer.num_notifications());
EXPECT_EQ(base::Milliseconds(1800), network_quality_observer.http_rtt());
EXPECT_EQ(base::Milliseconds(1500), network_quality_observer.transport_rtt());
EXPECT_EQ(75, network_quality_observer.downlink_bandwidth_kbps());
}
} // namespace network
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