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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/media/router/discovery/discovery_network_monitor.h"
#include <algorithm>
#include <memory>
#include <unordered_set>
#include "base/check_op.h"
#include "base/hash/sha1.h"
#include "base/lazy_instance.h"
#include "base/memory/ptr_util.h"
#include "base/observer_list.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/task/task_traits.h"
#include "base/task/thread_pool.h"
#include "base/time/default_tick_clock.h"
#include "chrome/browser/media/router/discovery/discovery_network_list.h"
#include "content/public/browser/network_service_instance.h"
#include "net/base/network_interfaces.h"
namespace media_router {
namespace {
std::string ComputeNetworkId(
const std::vector<DiscoveryNetworkInfo>& network_info_list) {
if (network_info_list.empty()) {
return DiscoveryNetworkMonitor::kNetworkIdDisconnected;
}
if (std::ranges::all_of(network_info_list, &std::string::empty,
&DiscoveryNetworkInfo::network_id)) {
return DiscoveryNetworkMonitor::kNetworkIdUnknown;
}
std::string combined_ids;
for (const auto& network_info : network_info_list) {
combined_ids = combined_ids + "!" + network_info.network_id;
}
auto hash = base::SHA1Hash(base::as_byte_span(combined_ids));
return base::ToLowerASCII(base::HexEncode(hash));
}
base::LazyInstance<DiscoveryNetworkMonitor>::Leaky g_discovery_monitor =
LAZY_INSTANCE_INITIALIZER;
} // namespace
// static
constexpr char const DiscoveryNetworkMonitor::kNetworkIdDisconnected[];
// static
constexpr char const DiscoveryNetworkMonitor::kNetworkIdUnknown[];
// static
DiscoveryNetworkMonitor* DiscoveryNetworkMonitor::GetInstance() {
return g_discovery_monitor.Pointer();
}
// static
std::unique_ptr<DiscoveryNetworkMonitor>
DiscoveryNetworkMonitor::CreateInstanceForTest(NetworkInfoFunction strategy) {
return base::WrapUnique(new DiscoveryNetworkMonitor(strategy));
}
void DiscoveryNetworkMonitor::AddObserver(Observer* const observer) {
observers_->AddObserver(observer);
}
void DiscoveryNetworkMonitor::RemoveObserver(Observer* const observer) {
observers_->RemoveObserver(observer);
}
void DiscoveryNetworkMonitor::Refresh(NetworkIdCallback callback) {
task_runner_->PostTaskAndReplyWithResult(
FROM_HERE,
base::BindOnce(&DiscoveryNetworkMonitor::UpdateNetworkInfo,
base::Unretained(this)),
std::move(callback));
}
void DiscoveryNetworkMonitor::GetNetworkId(NetworkIdCallback callback) {
task_runner_->PostTaskAndReplyWithResult(
FROM_HERE,
base::BindOnce(&DiscoveryNetworkMonitor::GetNetworkIdOnSequence,
base::Unretained(this)),
std::move(callback));
}
DiscoveryNetworkMonitor::DiscoveryNetworkMonitor()
: DiscoveryNetworkMonitor(&GetDiscoveryNetworkInfoList) {}
DiscoveryNetworkMonitor::DiscoveryNetworkMonitor(NetworkInfoFunction strategy)
: network_id_(kNetworkIdDisconnected),
observers_(new base::ObserverListThreadSafe<Observer>(
base::ObserverListPolicy::EXISTING_ONLY)),
task_runner_(base::ThreadPool::CreateSequencedTaskRunner(
{base::MayBlock(),
base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN})),
network_info_function_(strategy) {
DETACH_FROM_SEQUENCE(sequence_checker_);
content::GetNetworkConnectionTracker()->AddLeakyNetworkConnectionObserver(
this);
// If the current connection type is available, call UpdateNetworkInfo,
// otherwise let OnConnectionChanged call it when the connection type is
// ready.
auto connection_type = network::mojom::ConnectionType::CONNECTION_UNKNOWN;
if (content::GetNetworkConnectionTracker()->GetConnectionType(
&connection_type,
base::BindOnce(&DiscoveryNetworkMonitor::OnConnectionChanged,
base::Unretained(this)))) {
task_runner_->PostTask(
FROM_HERE,
base::BindOnce(
base::IgnoreResult(&DiscoveryNetworkMonitor::UpdateNetworkInfo),
base::Unretained(this)));
}
}
DiscoveryNetworkMonitor::~DiscoveryNetworkMonitor() {
// Never gets called.
}
void DiscoveryNetworkMonitor::SetNetworkInfoFunctionForTest(
NetworkInfoFunction strategy) {
network_info_function_ = strategy;
}
void DiscoveryNetworkMonitor::OnConnectionChanged(
network::mojom::ConnectionType type) {
task_runner_->PostTask(
FROM_HERE,
base::BindOnce(
base::IgnoreResult(&DiscoveryNetworkMonitor::UpdateNetworkInfo),
base::Unretained(this)));
}
std::string DiscoveryNetworkMonitor::GetNetworkIdOnSequence() const {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
return network_id_;
}
std::string DiscoveryNetworkMonitor::UpdateNetworkInfo() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
auto network_info_list = network_info_function_();
auto network_id = ComputeNetworkId(network_info_list);
// Although we are called with CONTINUE_ON_SHUTDOWN, none of these fields will
// disappear out from under us since |g_discovery_monitor| is declared with
// LeakyLazyInstanceTraits, and is therefore never deleted.
network_id_.swap(network_id);
if (network_id_ != network_id) {
observers_->Notify(FROM_HERE, &Observer::OnNetworksChanged, network_id_);
}
return network_id_;
}
} // namespace media_router
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