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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 "chromeos/ash/components/tether/tether_network_disconnection_handler.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/memory/ptr_util.h"
#include "base/metrics/histogram_macros.h"
#include "base/task/single_thread_task_runner.h"
#include "chromeos/ash/components/multidevice/logging/logging.h"
#include "chromeos/ash/components/network/network_state.h"
#include "chromeos/ash/components/network/network_state_handler.h"
#include "chromeos/ash/components/tether/disconnect_tethering_request_sender.h"
#include "chromeos/ash/components/tether/network_configuration_remover.h"
#include "chromeos/ash/components/tether/tether_disconnector.h"
#include "chromeos/ash/components/tether/tether_host_fetcher.h"
#include "chromeos/ash/components/tether/tether_session_completion_logger.h"
namespace ash::tether {
TetherNetworkDisconnectionHandler::TetherNetworkDisconnectionHandler(
ActiveHost* active_host,
NetworkStateHandler* network_state_handler,
NetworkConfigurationRemover* network_configuration_remover,
DisconnectTetheringRequestSender* disconnect_tethering_request_sender,
TetherSessionCompletionLogger* tether_session_completion_logger)
: active_host_(active_host),
network_state_handler_(network_state_handler),
network_configuration_remover_(network_configuration_remover),
disconnect_tethering_request_sender_(disconnect_tethering_request_sender),
tether_session_completion_logger_(tether_session_completion_logger),
task_runner_(base::SingleThreadTaskRunner::GetCurrentDefault()) {
network_state_handler_observer_.Observe(network_state_handler_.get());
}
TetherNetworkDisconnectionHandler::~TetherNetworkDisconnectionHandler() =
default;
void TetherNetworkDisconnectionHandler::NetworkConnectionStateChanged(
const NetworkState* network) {
// Only handle network connection state changes which indicate that the
// underlying Wi-Fi network for a Tether connection has been disconnected.
if (network->guid() != active_host_->GetWifiNetworkGuid() ||
network->IsConnectingOrConnected()) {
return;
}
// Handle disconnection as part of a new task. Posting a task here ensures
// that processing the disconnection is done after other
// NetworkStateHandlerObservers are finished running. Processing the
// disconnection immediately can cause crashes; see https://crbug.com/800370.
task_runner_->PostTask(
FROM_HERE, base::BindOnce(&TetherNetworkDisconnectionHandler::
HandleActiveWifiNetworkDisconnection,
weak_ptr_factory_.GetWeakPtr(), network->guid(),
network->path()));
}
void TetherNetworkDisconnectionHandler::OnShuttingDown() {
network_state_handler_observer_.Reset();
}
void TetherNetworkDisconnectionHandler::HandleActiveWifiNetworkDisconnection(
const std::string& network_guid,
const std::string& network_path) {
PA_LOG(WARNING) << "Connection to active host (Wi-Fi network GUID "
<< network_guid << ") has been lost.";
// Check if Wi-Fi is enabled; if it is, this indicates that the connection
// to the Tether host dropped. If it isn't, then the event of Wi-Fi being
// disabled caused the connection to end.
tether_session_completion_logger_->RecordTetherSessionCompletion(
network_state_handler_->IsTechnologyEnabled(NetworkTypePattern::WiFi())
? TetherSessionCompletionLogger::SessionCompletionReason::
CONNECTION_DROPPED
: TetherSessionCompletionLogger::SessionCompletionReason::
WIFI_DISABLED);
network_configuration_remover_->RemoveNetworkConfigurationByPath(
network_path);
// Send a DisconnectTetheringRequest to the tether host so that it can shut
// down its Wi-Fi hotspot if it is no longer in use.
disconnect_tethering_request_sender_->SendDisconnectRequestToDevice(
active_host_->GetActiveHostDeviceId());
active_host_->SetActiveHostDisconnected();
}
void TetherNetworkDisconnectionHandler::SetTaskRunnerForTesting(
scoped_refptr<base::TaskRunner> test_task_runner) {
task_runner_ = test_task_runner;
}
} // namespace ash::tether
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