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// Copyright 2014 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 "device/bluetooth/dbus/bluetooth_gatt_descriptor_client.h"
#include <stddef.h>
#include "base/bind.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "base/values.h"
#include "dbus/bus.h"
#include "dbus/object_manager.h"
#include "dbus/values_util.h"
#include "third_party/cros_system_api/dbus/service_constants.h"
namespace bluez {
namespace {
// TODO(armansito): Move this constant to cros_system_api.
const char kValueProperty[] = "Value";
} // namespace
// static
const char BluetoothGattDescriptorClient::kNoResponseError[] =
"org.chromium.Error.NoResponse";
// static
const char BluetoothGattDescriptorClient::kUnknownDescriptorError[] =
"org.chromium.Error.UnknownDescriptor";
BluetoothGattDescriptorClient::Properties::Properties(
dbus::ObjectProxy* object_proxy,
const std::string& interface_name,
const PropertyChangedCallback& callback)
: dbus::PropertySet(object_proxy, interface_name, callback) {
RegisterProperty(bluetooth_gatt_descriptor::kUUIDProperty, &uuid);
RegisterProperty(bluetooth_gatt_descriptor::kCharacteristicProperty,
&characteristic);
RegisterProperty(kValueProperty, &value);
}
BluetoothGattDescriptorClient::Properties::~Properties() {}
// The BluetoothGattDescriptorClient implementation used in production.
class BluetoothGattDescriptorClientImpl
: public BluetoothGattDescriptorClient,
public dbus::ObjectManager::Interface {
public:
BluetoothGattDescriptorClientImpl()
: object_manager_(NULL), weak_ptr_factory_(this) {}
~BluetoothGattDescriptorClientImpl() override {
object_manager_->UnregisterInterface(
bluetooth_gatt_descriptor::kBluetoothGattDescriptorInterface);
}
// BluetoothGattDescriptorClientImpl override.
void AddObserver(BluetoothGattDescriptorClient::Observer* observer) override {
DCHECK(observer);
observers_.AddObserver(observer);
}
// BluetoothGattDescriptorClientImpl override.
void RemoveObserver(
BluetoothGattDescriptorClient::Observer* observer) override {
DCHECK(observer);
observers_.RemoveObserver(observer);
}
// BluetoothGattDescriptorClientImpl override.
std::vector<dbus::ObjectPath> GetDescriptors() override {
DCHECK(object_manager_);
return object_manager_->GetObjectsWithInterface(
bluetooth_gatt_descriptor::kBluetoothGattDescriptorInterface);
}
// BluetoothGattDescriptorClientImpl override.
Properties* GetProperties(const dbus::ObjectPath& object_path) override {
DCHECK(object_manager_);
return static_cast<Properties*>(object_manager_->GetProperties(
object_path,
bluetooth_gatt_descriptor::kBluetoothGattDescriptorInterface));
}
// BluetoothGattDescriptorClientImpl override.
void ReadValue(const dbus::ObjectPath& object_path,
const ValueCallback& callback,
const ErrorCallback& error_callback) override {
dbus::ObjectProxy* object_proxy =
object_manager_->GetObjectProxy(object_path);
if (!object_proxy) {
error_callback.Run(kUnknownDescriptorError, "");
return;
}
dbus::MethodCall method_call(
bluetooth_gatt_descriptor::kBluetoothGattDescriptorInterface,
bluetooth_gatt_descriptor::kReadValue);
// Append empty option dict
dbus::MessageWriter writer(&method_call);
base::DictionaryValue dict;
dbus::AppendValueData(&writer, dict);
object_proxy->CallMethodWithErrorCallback(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&BluetoothGattDescriptorClientImpl::OnValueSuccess,
weak_ptr_factory_.GetWeakPtr(), callback),
base::Bind(&BluetoothGattDescriptorClientImpl::OnError,
weak_ptr_factory_.GetWeakPtr(), error_callback));
}
// BluetoothGattDescriptorClientImpl override.
void WriteValue(const dbus::ObjectPath& object_path,
const std::vector<uint8_t>& value,
const base::Closure& callback,
const ErrorCallback& error_callback) override {
dbus::ObjectProxy* object_proxy =
object_manager_->GetObjectProxy(object_path);
if (!object_proxy) {
error_callback.Run(kUnknownDescriptorError, "");
return;
}
dbus::MethodCall method_call(
bluetooth_gatt_descriptor::kBluetoothGattDescriptorInterface,
bluetooth_gatt_descriptor::kWriteValue);
dbus::MessageWriter writer(&method_call);
writer.AppendArrayOfBytes(value.data(), value.size());
// Append empty option dict
base::DictionaryValue dict;
dbus::AppendValueData(&writer, dict);
object_proxy->CallMethodWithErrorCallback(
&method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
base::Bind(&BluetoothGattDescriptorClientImpl::OnSuccess,
weak_ptr_factory_.GetWeakPtr(), callback),
base::Bind(&BluetoothGattDescriptorClientImpl::OnError,
weak_ptr_factory_.GetWeakPtr(), error_callback));
}
// dbus::ObjectManager::Interface override.
dbus::PropertySet* CreateProperties(
dbus::ObjectProxy* object_proxy,
const dbus::ObjectPath& object_path,
const std::string& interface_name) override {
Properties* properties = new Properties(
object_proxy, interface_name,
base::Bind(&BluetoothGattDescriptorClientImpl::OnPropertyChanged,
weak_ptr_factory_.GetWeakPtr(), object_path));
return static_cast<dbus::PropertySet*>(properties);
}
// dbus::ObjectManager::Interface override.
void ObjectAdded(const dbus::ObjectPath& object_path,
const std::string& interface_name) override {
VLOG(2) << "Remote GATT descriptor added: " << object_path.value();
FOR_EACH_OBSERVER(BluetoothGattDescriptorClient::Observer, observers_,
GattDescriptorAdded(object_path));
}
// dbus::ObjectManager::Interface override.
void ObjectRemoved(const dbus::ObjectPath& object_path,
const std::string& interface_name) override {
VLOG(2) << "Remote GATT descriptor removed: " << object_path.value();
FOR_EACH_OBSERVER(BluetoothGattDescriptorClient::Observer, observers_,
GattDescriptorRemoved(object_path));
}
protected:
// bluez::DBusClient override.
void Init(dbus::Bus* bus) override {
object_manager_ = bus->GetObjectManager(
bluetooth_object_manager::kBluetoothObjectManagerServiceName,
dbus::ObjectPath(
bluetooth_object_manager::kBluetoothObjectManagerServicePath));
object_manager_->RegisterInterface(
bluetooth_gatt_descriptor::kBluetoothGattDescriptorInterface, this);
}
private:
// Called by dbus::PropertySet when a property value is changed, either by
// result of a signal or response to a GetAll() or Get() call. Informs
// observers.
virtual void OnPropertyChanged(const dbus::ObjectPath& object_path,
const std::string& property_name) {
VLOG(2) << "Remote GATT descriptor property changed: "
<< object_path.value() << ": " << property_name;
FOR_EACH_OBSERVER(
BluetoothGattDescriptorClient::Observer, observers_,
GattDescriptorPropertyChanged(object_path, property_name));
}
// Called when a response for a successful method call is received.
void OnSuccess(const base::Closure& callback, dbus::Response* response) {
DCHECK(response);
callback.Run();
}
// Called when a descriptor value response for a successful method call is
// received.
void OnValueSuccess(const ValueCallback& callback, dbus::Response* response) {
DCHECK(response);
dbus::MessageReader reader(response);
const uint8_t* bytes = NULL;
size_t length = 0;
if (!reader.PopArrayOfBytes(&bytes, &length))
VLOG(2) << "Error reading array of bytes in ValueCallback";
std::vector<uint8_t> value;
if (bytes)
value.assign(bytes, bytes + length);
callback.Run(value);
}
// Called when a response for a failed method call is received.
void OnError(const ErrorCallback& error_callback,
dbus::ErrorResponse* response) {
// Error response has optional error message argument.
std::string error_name;
std::string error_message;
if (response) {
dbus::MessageReader reader(response);
error_name = response->GetErrorName();
reader.PopString(&error_message);
} else {
error_name = kNoResponseError;
error_message = "";
}
error_callback.Run(error_name, error_message);
}
dbus::ObjectManager* object_manager_;
// List of observers interested in event notifications from us.
base::ObserverList<BluetoothGattDescriptorClient::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<BluetoothGattDescriptorClientImpl> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(BluetoothGattDescriptorClientImpl);
};
BluetoothGattDescriptorClient::BluetoothGattDescriptorClient() {}
BluetoothGattDescriptorClient::~BluetoothGattDescriptorClient() {}
// static
BluetoothGattDescriptorClient* BluetoothGattDescriptorClient::Create() {
return new BluetoothGattDescriptorClientImpl();
}
} // namespace bluez