1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
// Copyright 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/nfc_device_client.h"
#include <set>
#include "base/bind.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "base/stl_util.h"
#include "base/strings/stringprintf.h"
#include "chromeos/dbus/fake_nfc_device_client.h"
#include "chromeos/dbus/nfc_adapter_client.h"
#include "dbus/bus.h"
#include "dbus/message.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
using chromeos::nfc_client_helpers::DBusObjectMap;
namespace chromeos {
namespace {
typedef std::vector<dbus::ObjectPath> ObjectPathVector;
} // namespace
NfcDeviceClient::Properties::Properties(
dbus::ObjectProxy* object_proxy,
const PropertyChangedCallback& callback)
: NfcPropertySet(object_proxy,
nfc_device::kNfcDeviceInterface,
callback) {
RegisterProperty(nfc_device::kRecordsProperty, &records);
}
NfcDeviceClient::Properties::~Properties() {
}
// The NfcDeviceClient implementation used in production.
class NfcDeviceClientImpl : public NfcDeviceClient,
public NfcAdapterClient::Observer,
public DBusObjectMap::Delegate {
public:
explicit NfcDeviceClientImpl(NfcAdapterClient* adapter_client)
: bus_(NULL),
adapter_client_(adapter_client),
weak_ptr_factory_(this) {
DCHECK(adapter_client);
}
virtual ~NfcDeviceClientImpl() {
adapter_client_->RemoveObserver(this);
}
// NfcDeviceClient override.
virtual void AddObserver(NfcDeviceClient::Observer* observer) OVERRIDE {
DCHECK(observer);
observers_.AddObserver(observer);
}
// NfcDeviceClient override.
virtual void RemoveObserver(NfcDeviceClient::Observer* observer) OVERRIDE {
DCHECK(observer);
observers_.RemoveObserver(observer);
}
// NfcDeviceClient override.
virtual Properties* GetProperties(const dbus::ObjectPath& object_path)
OVERRIDE {
return static_cast<Properties*>(
object_map_->GetObjectProperties(object_path));
}
// NfcDeviceClient override.
virtual void Push(
const dbus::ObjectPath& object_path,
const RecordAttributes& attributes,
const base::Closure& callback,
const nfc_client_helpers::ErrorCallback& error_callback) OVERRIDE {
dbus::ObjectProxy* object_proxy = object_map_->GetObjectProxy(object_path);
if (!object_proxy) {
std::string error_message =
base::StringPrintf(
"NFC device with object path \"%s\" does not exist.",
object_path.value().c_str());
LOG(ERROR) << error_message;
error_callback.Run(nfc_client_helpers::kUnknownObjectError,
error_message);
return;
}
// |attributes| should not be empty.
if (attributes.empty()) {
std::string error_message =
"Cannot push data to device with empty arguments.";
LOG(ERROR) << error_message;
error_callback.Run(nfc_error::kInvalidArguments, error_message);
return;
}
// Create the arguments.
dbus::MethodCall method_call(nfc_device::kNfcDeviceInterface,
nfc_device::kPush);
dbus::MessageWriter writer(&method_call);
dbus::MessageWriter array_writer(NULL);
dbus::MessageWriter dict_entry_writer(NULL);
writer.OpenArray("{sv}", &array_writer);
for (RecordAttributes::const_iterator iter = attributes.begin();
iter != attributes.end(); ++iter) {
array_writer.OpenDictEntry(&dict_entry_writer);
dict_entry_writer.AppendString(iter->first);
dict_entry_writer.AppendVariantOfString(iter->second);
array_writer.CloseContainer(&dict_entry_writer);
}
writer.CloseContainer(&array_writer);
object_proxy->CallMethodWithErrorCallback(
&method_call,
dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&nfc_client_helpers::OnSuccess, callback),
base::Bind(&nfc_client_helpers::OnError, error_callback));
}
protected:
// DBusClient override.
virtual void Init(dbus::Bus* bus) OVERRIDE {
VLOG(1) << "Creating NfcDeviceClientImpl";
DCHECK(bus);
bus_ = bus;
object_map_.reset(new DBusObjectMap(
nfc_device::kNfcDeviceServiceName, this, bus));
DCHECK(adapter_client_);
adapter_client_->AddObserver(this);
}
// NfcAdapterClient::Observer override.
virtual void AdapterPropertyChanged(
const dbus::ObjectPath& object_path,
const std::string& property_name) OVERRIDE {
DCHECK(adapter_client_);
NfcAdapterClient::Properties *adapter_properties =
adapter_client_->GetProperties(object_path);
// Ignore changes to properties other than "Devices".
if (property_name != adapter_properties->devices.name())
return;
VLOG(1) << "NFC devices changed.";
// Add all the new devices.
const ObjectPathVector& received_devices =
adapter_properties->devices.value();
for (ObjectPathVector::const_iterator iter = received_devices.begin();
iter != received_devices.end(); ++iter) {
const dbus::ObjectPath &device_path = *iter;
if (object_map_->AddObject(device_path)) {
VLOG(1) << "Found NFC device: " << device_path.value();
FOR_EACH_OBSERVER(NfcDeviceClient::Observer, observers_,
DeviceFound(device_path, object_path));
}
}
// Remove all devices that were lost.
const DBusObjectMap::ObjectMap& known_devices =
object_map_->object_map();
std::set<dbus::ObjectPath> devices_set(received_devices.begin(),
received_devices.end());
DBusObjectMap::ObjectMap::const_iterator iter = known_devices.begin();
while (iter != known_devices.end()) {
// Make a copy here, as the iterator will be invalidated by
// DBusObjectMap::RemoveObject below, but |device_path| is needed to
// notify observers right after. We want to make sure that we notify
// the observers AFTER we remove the object, so that method calls
// to the removed object paths in observer implementations fail
// gracefully.
dbus::ObjectPath device_path = iter->first;
++iter;
if (!ContainsKey(devices_set, device_path)) {
VLOG(1) << "Lost NFC device: " << device_path.value();
object_map_->RemoveObject(device_path);
FOR_EACH_OBSERVER(NfcDeviceClient::Observer, observers_,
DeviceLost(device_path, object_path));
}
}
}
// nfc_client_helpers::DBusObjectMap::Delegate override.
virtual NfcPropertySet* CreateProperties(
dbus::ObjectProxy* object_proxy) OVERRIDE {
return new Properties(
object_proxy,
base::Bind(&NfcDeviceClientImpl::OnPropertyChanged,
weak_ptr_factory_.GetWeakPtr(),
object_proxy->object_path()));
}
// Called by NfcPropertySet when a property value is changed, either by
// result of a signal or response to a GetAll() or Get() call.
void OnPropertyChanged(const dbus::ObjectPath& object_path,
const std::string& property_name) {
VLOG(1) << "Device property changed; Path: " << object_path.value()
<< " Property: " << property_name;
FOR_EACH_OBSERVER(NfcDeviceClient::Observer, observers_,
DevicePropertyChanged(object_path, property_name));
}
private:
// We maintain a pointer to the bus to be able to request proxies for
// new NFC devices that appear.
dbus::Bus* bus_;
// Mapping from object paths to object proxies and properties structures that
// were already created by us.
scoped_ptr<DBusObjectMap> object_map_;
// The manager client that we listen to events notifications from.
NfcAdapterClient* adapter_client_;
// List of observers interested in event notifications.
ObserverList<NfcDeviceClient::Observer> observers_;
// Weak pointer factory for generating 'this' pointers that might live longer
// than we do.
// 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<NfcDeviceClientImpl> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(NfcDeviceClientImpl);
};
NfcDeviceClient::NfcDeviceClient() {
}
NfcDeviceClient::~NfcDeviceClient() {
}
NfcDeviceClient* NfcDeviceClient::Create(DBusClientImplementationType type,
NfcAdapterClient* adapter_client) {
if (type == REAL_DBUS_CLIENT_IMPLEMENTATION)
return new NfcDeviceClientImpl(adapter_client);
DCHECK_EQ(STUB_DBUS_CLIENT_IMPLEMENTATION, type);
return new FakeNfcDeviceClient();
}
} // namespace chromeos
|