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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/logging.h"
- #include "base/memory/raw_ptr.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() = default;
- // The BluetoothGattDescriptorClient implementation used in production.
- class BluetoothGattDescriptorClientImpl
- : public BluetoothGattDescriptorClient,
- public dbus::ObjectManager::Interface {
- public:
- BluetoothGattDescriptorClientImpl() : object_manager_(nullptr) {}
- BluetoothGattDescriptorClientImpl(const BluetoothGattDescriptorClientImpl&) =
- delete;
- BluetoothGattDescriptorClientImpl& operator=(
- const BluetoothGattDescriptorClientImpl&) = delete;
- ~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,
- ValueCallback callback,
- ErrorCallback error_callback) override {
- dbus::ObjectProxy* object_proxy =
- object_manager_->GetObjectProxy(object_path);
- if (!object_proxy) {
- std::move(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);
- dbus::AppendValueData(&writer, base::Value::Dict());
- object_proxy->CallMethodWithErrorCallback(
- &method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
- base::BindOnce(&BluetoothGattDescriptorClientImpl::OnValueSuccess,
- weak_ptr_factory_.GetWeakPtr(), std::move(callback)),
- base::BindOnce(&BluetoothGattDescriptorClientImpl::OnError,
- weak_ptr_factory_.GetWeakPtr(),
- std::move(error_callback)));
- }
- // BluetoothGattDescriptorClientImpl override.
- void WriteValue(const dbus::ObjectPath& object_path,
- const std::vector<uint8_t>& value,
- base::OnceClosure callback,
- ErrorCallback error_callback) override {
- dbus::ObjectProxy* object_proxy =
- object_manager_->GetObjectProxy(object_path);
- if (!object_proxy) {
- std::move(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
- dbus::AppendValueData(&writer, base::Value::Dict());
- object_proxy->CallMethodWithErrorCallback(
- &method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
- base::BindOnce(&BluetoothGattDescriptorClientImpl::OnSuccess,
- weak_ptr_factory_.GetWeakPtr(), std::move(callback)),
- base::BindOnce(&BluetoothGattDescriptorClientImpl::OnError,
- weak_ptr_factory_.GetWeakPtr(),
- std::move(error_callback)));
- }
- // dbus::ObjectManager::Interface override.
- dbus::PropertySet* CreateProperties(
- dbus::ObjectProxy* object_proxy,
- const dbus::ObjectPath& object_path,
- const std::string& interface_name) override {
- return new Properties(
- object_proxy, interface_name,
- base::BindRepeating(
- &BluetoothGattDescriptorClientImpl::OnPropertyChanged,
- weak_ptr_factory_.GetWeakPtr(), object_path));
- }
- // dbus::ObjectManager::Interface override.
- void ObjectAdded(const dbus::ObjectPath& object_path,
- const std::string& interface_name) override {
- DVLOG(2) << "Remote GATT descriptor added: " << object_path.value();
- for (auto& observer : observers_)
- observer.GattDescriptorAdded(object_path);
- }
- // dbus::ObjectManager::Interface override.
- void ObjectRemoved(const dbus::ObjectPath& object_path,
- const std::string& interface_name) override {
- DVLOG(2) << "Remote GATT descriptor removed: " << object_path.value();
- for (auto& observer : observers_)
- observer.GattDescriptorRemoved(object_path);
- }
- protected:
- // bluez::DBusClient override.
- void Init(dbus::Bus* bus,
- const std::string& bluetooth_service_name) override {
- object_manager_ = bus->GetObjectManager(
- bluetooth_service_name,
- 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) {
- DVLOG(2) << "Remote GATT descriptor property changed: "
- << object_path.value() << ": " << property_name;
- for (auto& observer : observers_)
- observer.GattDescriptorPropertyChanged(object_path, property_name);
- }
- // Called when a response for a successful method call is received.
- void OnSuccess(base::OnceClosure callback, dbus::Response* response) {
- DCHECK(response);
- std::move(callback).Run();
- }
- // Called when a descriptor value response for a successful method call is
- // received.
- void OnValueSuccess(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))
- DVLOG(2) << "Error reading array of bytes in ValueCallback";
- std::vector<uint8_t> value;
- if (bytes)
- value.assign(bytes, bytes + length);
- std::move(callback).Run(/*error_code=*/absl::nullopt, value);
- }
- // Called when a response for a failed method call is received.
- void OnError(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 = "";
- }
- std::move(error_callback).Run(error_name, error_message);
- }
- raw_ptr<dbus::ObjectManager> object_manager_;
- // List of observers interested in event notifications from us.
- base::ObserverList<BluetoothGattDescriptorClient::Observer>::Unchecked
- 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_{
- this};
- };
- BluetoothGattDescriptorClient::BluetoothGattDescriptorClient() = default;
- BluetoothGattDescriptorClient::~BluetoothGattDescriptorClient() = default;
- // static
- BluetoothGattDescriptorClient* BluetoothGattDescriptorClient::Create() {
- return new BluetoothGattDescriptorClientImpl();
- }
- } // namespace bluez
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