blob: e99614ebb98965e54384394ff109f0c23c1cca12 [file] [log] [blame]
// Copyright (c) 2013 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 "chromeos/dbus/system_clock/system_clock_client.h"
#include <stdint.h>
#include <string>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/macros.h"
#include "base/observer_list.h"
#include "chromeos/dbus/system_clock/fake_system_clock_client.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "dbus/object_path.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
namespace chromeos {
namespace {
// Handles replies to D-Bus calls made by GetLastSyncInfo.
void OnGetLastSyncInfo(SystemClockClient::GetLastSyncInfoCallback callback,
dbus::Response* response) {
if (!response) {
LOG(ERROR) << system_clock::kSystemClockInterface << "."
<< system_clock::kSystemLastSyncInfo << " request failed.";
return;
}
dbus::MessageReader reader(response);
bool network_synchronized = false;
if (!reader.PopBool(&network_synchronized)) {
LOG(ERROR) << system_clock::kSystemClockInterface << "."
<< system_clock::kSystemLastSyncInfo
<< " response lacks network-synchronized argument.";
return;
}
std::move(callback).Run(network_synchronized);
}
SystemClockClient* g_instance = nullptr;
} // namespace
// The SystemClockClient implementation used in production.
class SystemClockClientImpl : public SystemClockClient {
public:
explicit SystemClockClientImpl(dbus::Bus* bus)
: can_set_time_(false),
can_set_time_initialized_(false),
system_clock_proxy_(nullptr),
weak_ptr_factory_(this) {
CHECK(bus);
InitDBus(bus);
}
~SystemClockClientImpl() override = default;
void AddObserver(Observer* observer) override {
observers_.AddObserver(observer);
}
void RemoveObserver(Observer* observer) override {
observers_.RemoveObserver(observer);
}
bool HasObserver(const Observer* observer) const override {
return observers_.HasObserver(observer);
}
void SetTime(int64_t time_in_seconds) override {
// Always try to set the time, because |can_set_time_| may be stale.
dbus::MethodCall method_call(system_clock::kSystemClockInterface,
system_clock::kSystemClockSet);
dbus::MessageWriter writer(&method_call);
writer.AppendInt64(time_in_seconds);
system_clock_proxy_->CallMethod(&method_call,
dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::DoNothing());
}
bool CanSetTime() override { return can_set_time_; }
void GetLastSyncInfo(GetLastSyncInfoCallback callback) override {
dbus::MethodCall method_call(system_clock::kSystemClockInterface,
system_clock::kSystemLastSyncInfo);
system_clock_proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(OnGetLastSyncInfo, std::move(callback)));
}
void WaitForServiceToBeAvailable(
dbus::ObjectProxy::WaitForServiceToBeAvailableCallback callback)
override {
system_clock_proxy_->WaitForServiceToBeAvailable(std::move(callback));
}
TestInterface* GetTestInterface() override { return nullptr; }
private:
void InitDBus(dbus::Bus* bus) {
system_clock_proxy_ = bus->GetObjectProxy(
system_clock::kSystemClockServiceName,
dbus::ObjectPath(system_clock::kSystemClockServicePath));
system_clock_proxy_->ConnectToSignal(
system_clock::kSystemClockInterface, system_clock::kSystemClockUpdated,
base::Bind(&SystemClockClientImpl::TimeUpdatedReceived,
weak_ptr_factory_.GetWeakPtr()),
base::BindOnce(&SystemClockClientImpl::TimeUpdatedConnected,
weak_ptr_factory_.GetWeakPtr()));
WaitForServiceToBeAvailable(
base::BindOnce(&SystemClockClientImpl::ServiceInitiallyAvailable,
weak_ptr_factory_.GetWeakPtr()));
}
// Called once when the service initially becomes available (or immediately if
// it's already available).
void ServiceInitiallyAvailable(bool service_is_available) {
if (service_is_available)
GetCanSet();
else
LOG(ERROR) << "Failed to wait for D-Bus service availability";
}
// Called when a TimeUpdated signal is received.
void TimeUpdatedReceived(dbus::Signal* signal) {
VLOG(1) << "TimeUpdated signal received: " << signal->ToString();
dbus::MessageReader reader(signal);
for (auto& observer : observers_)
observer.SystemClockUpdated();
// Check if the system clock can be changed now.
GetCanSet();
}
// Called when the TimeUpdated signal is initially connected.
void TimeUpdatedConnected(const std::string& interface_name,
const std::string& signal_name,
bool success) {
LOG_IF(ERROR, !success) << "Failed to connect to TimeUpdated signal.";
}
// Callback for CanSetTime method.
void OnGetCanSet(dbus::Response* response) {
if (!response) {
VLOG(1) << "CanSetTime request failed.";
return;
}
dbus::MessageReader reader(response);
bool can_set_time;
if (!reader.PopBool(&can_set_time)) {
LOG(ERROR) << "CanSetTime response invalid: " << response->ToString();
return;
}
// Nothing to do if the CanSetTime response hasn't changed.
if (can_set_time_initialized_ && can_set_time_ == can_set_time)
return;
can_set_time_initialized_ = true;
can_set_time_ = can_set_time;
for (auto& observer : observers_)
observer.SystemClockCanSetTimeChanged(can_set_time);
}
// Check whether the time can be set.
void GetCanSet() {
dbus::MethodCall method_call(system_clock::kSystemClockInterface,
system_clock::kSystemClockCanSet);
dbus::MessageWriter writer(&method_call);
system_clock_proxy_->CallMethod(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::BindOnce(&SystemClockClientImpl::OnGetCanSet,
weak_ptr_factory_.GetWeakPtr()));
}
// Whether the time can be set. Value is false until the first
// CanSetTime response is received.
bool can_set_time_;
bool can_set_time_initialized_;
dbus::ObjectProxy* system_clock_proxy_;
base::ObserverList<Observer>::Unchecked observers_;
base::WeakPtrFactory<SystemClockClientImpl> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(SystemClockClientImpl);
};
SystemClockClient::SystemClockClient() {
CHECK(!g_instance);
g_instance = this;
}
SystemClockClient::~SystemClockClient() {
CHECK_EQ(this, g_instance);
g_instance = nullptr;
}
// static
void SystemClockClient::Initialize(dbus::Bus* bus) {
CHECK(bus);
new SystemClockClientImpl(bus);
}
// static
void SystemClockClient::InitializeFake() {
new FakeSystemClockClient();
}
// static
void SystemClockClient::Shutdown() {
CHECK(g_instance);
delete g_instance;
}
// static
SystemClockClient* SystemClockClient::Get() {
return g_instance;
}
} // namespace chromeos