1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "chromeos/dbus/system_clock_client.h"
6
7 #include "base/bind.h"
8 #include "base/callback.h"
9 #include "base/observer_list.h"
10 #include "dbus/bus.h"
11 #include "dbus/message.h"
12 #include "dbus/object_path.h"
13 #include "dbus/object_proxy.h"
14 #include "third_party/cros_system_api/dbus/service_constants.h"
15
16 namespace chromeos {
17
18 // The SystemClockClient implementation used in production.
19 class SystemClockClientImpl : public SystemClockClient {
20 public:
SystemClockClientImpl()21 SystemClockClientImpl()
22 : can_set_time_(false),
23 can_set_time_initialized_(false),
24 system_clock_proxy_(NULL),
25 weak_ptr_factory_(this) {}
26
~SystemClockClientImpl()27 virtual ~SystemClockClientImpl() {
28 }
29
AddObserver(Observer * observer)30 virtual void AddObserver(Observer* observer) OVERRIDE {
31 observers_.AddObserver(observer);
32 }
33
RemoveObserver(Observer * observer)34 virtual void RemoveObserver(Observer* observer) OVERRIDE {
35 observers_.RemoveObserver(observer);
36 }
37
HasObserver(Observer * observer)38 virtual bool HasObserver(Observer* observer) OVERRIDE {
39 return observers_.HasObserver(observer);
40 }
41
SetTime(int64 time_in_seconds)42 virtual void SetTime(int64 time_in_seconds) OVERRIDE {
43 // Always try to set the time, because |can_set_time_| may be stale.
44 dbus::MethodCall method_call(system_clock::kSystemClockInterface,
45 system_clock::kSystemClockSet);
46 dbus::MessageWriter writer(&method_call);
47 writer.AppendInt64(time_in_seconds);
48 system_clock_proxy_->CallMethod(&method_call,
49 dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
50 dbus::ObjectProxy::EmptyResponseCallback());
51 }
52
CanSetTime()53 virtual bool CanSetTime() OVERRIDE { return can_set_time_; }
54
55 protected:
Init(dbus::Bus * bus)56 virtual void Init(dbus::Bus* bus) OVERRIDE {
57 system_clock_proxy_ = bus->GetObjectProxy(
58 system_clock::kSystemClockServiceName,
59 dbus::ObjectPath(system_clock::kSystemClockServicePath));
60
61 // Check whether the system clock can be set.
62 GetCanSet();
63
64 // Monitor the D-Bus signal for TimeUpdated changes.
65 system_clock_proxy_->ConnectToSignal(
66 system_clock::kSystemClockInterface,
67 system_clock::kSystemClockUpdated,
68 base::Bind(&SystemClockClientImpl::TimeUpdatedReceived,
69 weak_ptr_factory_.GetWeakPtr()),
70 base::Bind(&SystemClockClientImpl::TimeUpdatedConnected,
71 weak_ptr_factory_.GetWeakPtr()));
72 }
73
74 private:
75 // Called when a TimeUpdated signal is received.
TimeUpdatedReceived(dbus::Signal * signal)76 void TimeUpdatedReceived(dbus::Signal* signal) {
77 VLOG(1) << "TimeUpdated signal received: " << signal->ToString();
78 dbus::MessageReader reader(signal);
79 FOR_EACH_OBSERVER(Observer, observers_, SystemClockUpdated());
80
81 // Check if the system clock can be changed now.
82 GetCanSet();
83 }
84
85 // Called when the TimeUpdated signal is initially connected.
TimeUpdatedConnected(const std::string & interface_name,const std::string & signal_name,bool success)86 void TimeUpdatedConnected(const std::string& interface_name,
87 const std::string& signal_name,
88 bool success) {
89 LOG_IF(ERROR, !success)
90 << "Failed to connect to TimeUpdated signal.";
91 }
92
93 // Callback for CanSetTime method.
OnGetCanSet(dbus::Response * response)94 void OnGetCanSet(dbus::Response* response) {
95 if (!response) {
96 LOG(WARNING) << "CanSetTime request failed.";
97 return;
98 }
99
100 dbus::MessageReader reader(response);
101 bool can_set_time;
102 if (!reader.PopBool(&can_set_time)) {
103 LOG(ERROR) << "CanSetTime response invalid: " << response->ToString();
104 return;
105 }
106
107 // Nothing to do if the CanSetTime response hasn't changed.
108 if (can_set_time_initialized_ && can_set_time_ == can_set_time)
109 return;
110
111 can_set_time_initialized_ = true;
112 can_set_time_ = can_set_time;
113
114 FOR_EACH_OBSERVER(
115 Observer, observers_, SystemClockCanSetTimeChanged(can_set_time));
116 }
117
118 // Check whether the time can be set.
GetCanSet()119 void GetCanSet() {
120 dbus::MethodCall method_call(system_clock::kSystemClockInterface,
121 system_clock::kSystemClockCanSet);
122 dbus::MessageWriter writer(&method_call);
123 system_clock_proxy_->CallMethod(
124 &method_call,
125 dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
126 base::Bind(&SystemClockClientImpl::OnGetCanSet,
127 weak_ptr_factory_.GetWeakPtr()));
128 }
129
130 // Whether the time can be set. Value is false until the first
131 // CanSetTime response is received.
132 bool can_set_time_;
133 bool can_set_time_initialized_;
134 dbus::ObjectProxy* system_clock_proxy_;
135 ObserverList<Observer> observers_;
136
137 base::WeakPtrFactory<SystemClockClientImpl> weak_ptr_factory_;
138
139 DISALLOW_COPY_AND_ASSIGN(SystemClockClientImpl);
140 };
141
SystemClockUpdated()142 void SystemClockClient::Observer::SystemClockUpdated() {
143 }
144
SystemClockCanSetTimeChanged(bool can_set_time)145 void SystemClockClient::Observer::SystemClockCanSetTimeChanged(
146 bool can_set_time) {
147 }
148
SystemClockClient()149 SystemClockClient::SystemClockClient() {
150 }
151
~SystemClockClient()152 SystemClockClient::~SystemClockClient() {
153 }
154
155 // static
Create()156 SystemClockClient* SystemClockClient::Create() {
157 return new SystemClockClientImpl();
158 }
159
160 } // namespace chromeos
161