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connectivity_checker_impl.cc
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connectivity_checker_impl.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 "chromecast/net/connectivity_checker_impl.h"
#include "base/bind.h"
#include "base/command_line.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/memory/ptr_util.h"
#include "base/single_thread_task_runner.h"
#include "base/threading/thread_task_runner_handle.h"
#include "base/values.h"
#include "chromecast/base/metrics/cast_metrics_helper.h"
#include "chromecast/chromecast_buildflags.h"
#include "chromecast/net/net_switches.h"
#include "net/base/request_priority.h"
#include "net/http/http_network_session.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_response_info.h"
#include "net/http/http_status_code.h"
#include "net/http/http_transaction_factory.h"
#include "net/socket/ssl_client_socket.h"
#include "net/url_request/url_request_context.h"
#include "net/url_request/url_request_context_builder.h"
#include "net/url_request/url_request_context_getter.h"
namespace chromecast {
namespace {
// How often connectivity checks are performed in seconds while not connected.
const unsigned int kConnectivityPeriodSeconds = 1;
// How often connectivity checks are performed in seconds while connected.
const unsigned int kConnectivitySuccessPeriodSeconds = 60;
// Number of consecutive connectivity check errors before status is changed
// to offline.
const unsigned int kNumErrorsToNotifyOffline = 3;
// Request timeout value in seconds.
const unsigned int kRequestTimeoutInSeconds = 3;
// Default url for connectivity checking.
const char kDefaultConnectivityCheckUrl[] =
"https://connectivitycheck.gstatic.com/generate_204";
// Delay notification of network change events to smooth out rapid flipping.
// Histogram "Cast.Network.Down.Duration.In.Seconds" shows 40% of network
// downtime is less than 3 seconds.
const char kNetworkChangedDelayInSeconds = 3;
const char kMetricNameNetworkConnectivityCheckingErrorType[] =
"Network.ConnectivityChecking.ErrorType";
} // namespace
// static
scoped_refptr<ConnectivityCheckerImpl> ConnectivityCheckerImpl::Create(
scoped_refptr<base::SingleThreadTaskRunner> task_runner,
net::URLRequestContextGetter* url_request_context_getter) {
DCHECK(task_runner);
auto connectivity_checker =
base::WrapRefCounted(new ConnectivityCheckerImpl(task_runner));
task_runner->PostTask(
FROM_HERE,
base::BindOnce(&ConnectivityCheckerImpl::Initialize, connectivity_checker,
base::RetainedRef(url_request_context_getter)));
return connectivity_checker;
}
ConnectivityCheckerImpl::ConnectivityCheckerImpl(
scoped_refptr<base::SingleThreadTaskRunner> task_runner)
: ConnectivityChecker(),
task_runner_(std::move(task_runner)),
connected_(false),
connection_type_(net::NetworkChangeNotifier::CONNECTION_NONE),
check_errors_(0),
network_changed_pending_(false) {
DCHECK(task_runner_.get());
}
void ConnectivityCheckerImpl::Initialize(
net::URLRequestContextGetter* url_request_context_getter) {
url_request_context_getter_ = url_request_context_getter;
DCHECK(task_runner_->BelongsToCurrentThread());
base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
base::CommandLine::StringType check_url_str =
command_line->GetSwitchValueNative(switches::kConnectivityCheckUrl);
connectivity_check_url_.reset(new GURL(
check_url_str.empty() ? kDefaultConnectivityCheckUrl : check_url_str));
url_request_context_ = url_request_context_getter->GetURLRequestContext();
net::NetworkChangeNotifier::AddNetworkChangeObserver(this);
task_runner_->PostTask(FROM_HERE,
base::BindOnce(&ConnectivityCheckerImpl::Check, this));
}
ConnectivityCheckerImpl::~ConnectivityCheckerImpl() {
DCHECK(task_runner_.get());
net::NetworkChangeNotifier::RemoveNetworkChangeObserver(this);
task_runner_->DeleteSoon(FROM_HERE, url_request_.release());
}
bool ConnectivityCheckerImpl::Connected() const {
base::AutoLock auto_lock(connected_lock_);
return connected_;
}
void ConnectivityCheckerImpl::SetConnected(bool connected) {
DCHECK(task_runner_->BelongsToCurrentThread());
if (connected_ == connected)
return;
{
base::AutoLock auto_lock(connected_lock_);
connected_ = connected;
}
Notify(connected);
LOG(INFO) << "Global connection is: " << (connected ? "Up" : "Down");
}
void ConnectivityCheckerImpl::Check() {
task_runner_->PostTask(
FROM_HERE, base::BindOnce(&ConnectivityCheckerImpl::CheckInternal, this));
}
void ConnectivityCheckerImpl::CheckInternal() {
DCHECK(task_runner_->BelongsToCurrentThread());
DCHECK(url_request_context_);
// Don't check connectivity if network is offline, because Internet could be
// accessible via netifs ignored.
if (net::NetworkChangeNotifier::IsOffline())
return;
// If url_request_ is non-null, there is already a check going on. Don't
// start another.
if (url_request_.get())
return;
DVLOG(1) << "Connectivity check: url=" << *connectivity_check_url_;
url_request_ = url_request_context_->CreateRequest(
*connectivity_check_url_, net::MAXIMUM_PRIORITY, this);
url_request_->set_method("HEAD");
url_request_->Start();
timeout_.Reset(base::Bind(&ConnectivityCheckerImpl::OnUrlRequestTimeout,
this));
// Exponential backoff for timeout in 3, 6 and 12 sec.
const int timeout = kRequestTimeoutInSeconds
<< (check_errors_ > 2 ? 2 : check_errors_);
base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
FROM_HERE, timeout_.callback(), base::TimeDelta::FromSeconds(timeout));
}
void ConnectivityCheckerImpl::OnNetworkChanged(
net::NetworkChangeNotifier::ConnectionType type) {
DVLOG(2) << "OnNetworkChanged " << type;
connection_type_ = type;
if (network_changed_pending_)
return;
network_changed_pending_ = true;
base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
FROM_HERE,
base::BindOnce(&ConnectivityCheckerImpl::OnNetworkChangedInternal, this),
base::TimeDelta::FromSeconds(kNetworkChangedDelayInSeconds));
}
void ConnectivityCheckerImpl::OnNetworkChangedInternal() {
network_changed_pending_ = false;
Cancel();
if (connection_type_ == net::NetworkChangeNotifier::CONNECTION_NONE) {
SetConnected(false);
return;
}
Check();
}
void ConnectivityCheckerImpl::OnResponseStarted(net::URLRequest* request,
int net_error) {
DCHECK(task_runner_->BelongsToCurrentThread());
int http_response_code =
(net_error == net::OK &&
request->response_info().headers.get() != nullptr)
? request->response_info().headers->response_code()
: net::HTTP_BAD_REQUEST;
// Clears resources.
// URLRequest::Cancel() is called in destructor.
url_request_.reset(nullptr);
if (http_response_code < 400) {
DVLOG(1) << "Connectivity check succeeded";
check_errors_ = 0;
SetConnected(true);
// Some products don't have an idle screen that makes periodic network
// requests. Schedule another check to ensure connectivity hasn't dropped.
task_runner_->PostDelayedTask(
FROM_HERE,
base::BindOnce(&ConnectivityCheckerImpl::CheckInternal, this),
base::TimeDelta::FromSeconds(kConnectivitySuccessPeriodSeconds));
timeout_.Cancel();
return;
}
DVLOG(1) << "Connectivity check failed: " << http_response_code;
OnUrlRequestError(ErrorType::BAD_HTTP_STATUS);
timeout_.Cancel();
}
void ConnectivityCheckerImpl::OnReadCompleted(net::URLRequest* request,
int bytes_read) {
NOTREACHED();
}
void ConnectivityCheckerImpl::OnSSLCertificateError(
net::URLRequest* request,
int net_error,
const net::SSLInfo& ssl_info,
bool fatal) {
if (url_request_context_->http_transaction_factory()
->GetSession()
->params()
.ignore_certificate_errors) {
LOG(WARNING) << "OnSSLCertificateError: ignore cert_status="
<< ssl_info.cert_status;
request->ContinueDespiteLastError();
return;
}
DCHECK(task_runner_->BelongsToCurrentThread());
LOG(ERROR) << "OnSSLCertificateError: cert_status=" << ssl_info.cert_status;
url_request_context_->http_transaction_factory()
->GetSession()
->ClearSSLSessionCache();
OnUrlRequestError(ErrorType::SSL_CERTIFICATE_ERROR);
timeout_.Cancel();
}
void ConnectivityCheckerImpl::OnUrlRequestError(ErrorType type) {
DCHECK(task_runner_->BelongsToCurrentThread());
++check_errors_;
if (check_errors_ > kNumErrorsToNotifyOffline) {
// Only record event on the connectivity transition.
if (connected_) {
metrics::CastMetricsHelper::GetInstance()->RecordEventWithValue(
kMetricNameNetworkConnectivityCheckingErrorType,
static_cast<int>(type));
}
check_errors_ = kNumErrorsToNotifyOffline;
SetConnected(false);
}
url_request_.reset(nullptr);
// Check again.
task_runner_->PostDelayedTask(
FROM_HERE, base::BindOnce(&ConnectivityCheckerImpl::Check, this),
base::TimeDelta::FromSeconds(kConnectivityPeriodSeconds));
}
void ConnectivityCheckerImpl::OnUrlRequestTimeout() {
DCHECK(task_runner_->BelongsToCurrentThread());
LOG(ERROR) << "time out";
OnUrlRequestError(ErrorType::REQUEST_TIMEOUT);
}
void ConnectivityCheckerImpl::Cancel() {
DCHECK(task_runner_->BelongsToCurrentThread());
if (!url_request_.get())
return;
DVLOG(2) << "Cancel connectivity check in progress";
url_request_.reset(nullptr); // URLRequest::Cancel() is called in destructor.
timeout_.Cancel();
}
} // namespace chromecast