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// Copyright 2019 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/dbus/anomaly_detector/anomaly_detector_client.h"
#include <memory>
#include "base/check_op.h"
#include "base/functional/bind.h"
#include "base/logging.h"
#include "base/memory/raw_ptr.h"
#include "base/observer_list.h"
#include "chromeos/ash/components/dbus/anomaly_detector/fake_anomaly_detector_client.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "dbus/object_proxy.h"
#include "third_party/cros_system_api/dbus/anomaly_detector/dbus-constants.h"
namespace ash {
namespace {
AnomalyDetectorClient* g_instance = nullptr;
} // namespace
class AnomalyDetectorClientImpl : public AnomalyDetectorClient {
public:
AnomalyDetectorClientImpl() = default;
AnomalyDetectorClientImpl(const AnomalyDetectorClientImpl&) = delete;
AnomalyDetectorClientImpl& operator=(const AnomalyDetectorClientImpl&) =
delete;
~AnomalyDetectorClientImpl() override = default;
void AddObserver(Observer* observer) override {
observer_list_.AddObserver(observer);
}
void RemoveObserver(Observer* observer) override {
observer_list_.RemoveObserver(observer);
}
bool IsGuestFileCorruptionSignalConnected() override {
return is_guest_file_corruption_signal_connected_;
}
void Init(dbus::Bus* bus) override {
anomaly_detector_proxy_ = bus->GetObjectProxy(
anomaly_detector::kAnomalyEventServiceName,
dbus::ObjectPath(anomaly_detector::kAnomalyEventServicePath));
if (!anomaly_detector_proxy_) {
LOG(ERROR) << "Unable to get dbus proxy for "
<< anomaly_detector::kAnomalyEventServiceName;
}
anomaly_detector_proxy_->ConnectToSignal(
anomaly_detector::kAnomalyEventServiceInterface,
anomaly_detector::kAnomalyGuestFileCorruptionSignalName,
base::BindRepeating(
&AnomalyDetectorClientImpl::OnGuestFileCorruptionSignal,
weak_ptr_factory_.GetWeakPtr()),
base::BindOnce(&AnomalyDetectorClientImpl::OnSignalConnected,
weak_ptr_factory_.GetWeakPtr()));
}
private:
void OnGuestFileCorruptionSignal(dbus::Signal* signal) {
anomaly_detector::GuestFileCorruptionSignal proto_signal;
dbus::MessageReader reader(signal);
if (!reader.PopArrayOfBytesAsProto(&proto_signal)) {
LOG(ERROR) << "Failed to parse proto from DBus Signal";
return;
}
for (auto& observer : observer_list_) {
observer.OnGuestFileCorruption(proto_signal);
}
}
void OnSignalConnected(const std::string& interface_name,
const std::string& signal_name,
bool is_connected) {
if (!is_connected) {
LOG(ERROR) << "Failed to connect to signal " << signal_name;
}
DCHECK_EQ(interface_name, anomaly_detector::kAnomalyEventServiceInterface);
if (signal_name ==
anomaly_detector::kAnomalyGuestFileCorruptionSignalName) {
is_guest_file_corruption_signal_connected_ = is_connected;
} else {
NOTREACHED();
}
}
raw_ptr<dbus::ObjectProxy> anomaly_detector_proxy_ = nullptr;
base::ObserverList<Observer> observer_list_;
bool is_guest_file_corruption_signal_connected_ = false;
// Note: This should remain the last member so it'll be destroyed and
// invalidate its weak pointers before any other members are destroyed.
base::WeakPtrFactory<AnomalyDetectorClientImpl> weak_ptr_factory_{this};
};
AnomalyDetectorClient::AnomalyDetectorClient() {
CHECK(!g_instance);
g_instance = this;
}
AnomalyDetectorClient::~AnomalyDetectorClient() {
CHECK_EQ(g_instance, this);
g_instance = nullptr;
}
// static
void AnomalyDetectorClient::Initialize(dbus::Bus* bus) {
CHECK(bus);
(new AnomalyDetectorClientImpl())->Init(bus);
}
// static
void AnomalyDetectorClient::InitializeFake() {
new FakeAnomalyDetectorClient();
}
// static
void AnomalyDetectorClient::Shutdown() {
CHECK(g_instance);
delete g_instance;
}
// static
AnomalyDetectorClient* AnomalyDetectorClient::Get() {
return g_instance;
}
} // namespace ash
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