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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.
- #ifndef DEVICE_BLUETOOTH_DBUS_BLUETOOTH_GATT_DESCRIPTOR_CLIENT_H_
- #define DEVICE_BLUETOOTH_DBUS_BLUETOOTH_GATT_DESCRIPTOR_CLIENT_H_
- #include <stdint.h>
- #include <string>
- #include <vector>
- #include "base/callback.h"
- #include "dbus/object_path.h"
- #include "dbus/property.h"
- #include "device/bluetooth/bluetooth_export.h"
- #include "device/bluetooth/bluetooth_gatt_service.h"
- #include "device/bluetooth/dbus/bluez_dbus_client.h"
- #include "third_party/abseil-cpp/absl/types/optional.h"
- namespace bluez {
- // BluetoothGattDescriptorClient is used to communicate with remote GATT
- // characteristic descriptor objects exposed by the Bluetooth daemon.
- class DEVICE_BLUETOOTH_EXPORT BluetoothGattDescriptorClient
- : public BluezDBusClient {
- public:
- // Structure of properties associated with GATT descriptors.
- struct Properties : public dbus::PropertySet {
- // The 128-bit characteristic descriptor UUID. [read-only]
- dbus::Property<std::string> uuid;
- // Object path of the GATT characteristic the descriptor belongs to.
- // [read-only]
- dbus::Property<dbus::ObjectPath> characteristic;
- // The cached value of the descriptor. This property gets updated only after
- // a successful read request. [read-only]
- dbus::Property<std::vector<uint8_t>> value;
- Properties(dbus::ObjectProxy* object_proxy,
- const std::string& interface_name,
- const PropertyChangedCallback& callback);
- ~Properties() override;
- };
- // Interface for observing changes from a remote GATT characteristic
- // descriptor.
- class Observer {
- public:
- virtual ~Observer() {}
- // Called when the GATT descriptor with object path |object_path| is added
- // to the system.
- virtual void GattDescriptorAdded(const dbus::ObjectPath& object_path) {}
- // Called when the GATT descriptor with object path |object_path| is removed
- // from the system.
- virtual void GattDescriptorRemoved(const dbus::ObjectPath& object_path) {}
- // Called when the GATT descriptor with object path |object_path| has a
- // change in the value of the property named |property_name|.
- virtual void GattDescriptorPropertyChanged(
- const dbus::ObjectPath& object_path,
- const std::string& property_name) {}
- };
- // Callbacks used to report the result of asynchronous methods.
- using ErrorCallback =
- base::OnceCallback<void(const std::string& error_name,
- const std::string& error_message)>;
- using ValueCallback = base::OnceCallback<void(
- absl::optional<device::BluetoothGattService::GattErrorCode> error_code,
- const std::vector<uint8_t>& value)>;
- BluetoothGattDescriptorClient(const BluetoothGattDescriptorClient&) = delete;
- BluetoothGattDescriptorClient& operator=(
- const BluetoothGattDescriptorClient&) = delete;
- ~BluetoothGattDescriptorClient() override;
- // Adds and removes observers for events on all remote GATT descriptors. Check
- // the |object_path| parameter of observer methods to determine which GATT
- // descriptor is issuing the event.
- virtual void AddObserver(Observer* observer) = 0;
- virtual void RemoveObserver(Observer* observer) = 0;
- // Returns the list of GATT descriptor object paths known to the system.
- virtual std::vector<dbus::ObjectPath> GetDescriptors() = 0;
- // Obtain the properties for the GATT descriptor with object path
- // |object_path|. Values should be copied if needed.
- virtual Properties* GetProperties(const dbus::ObjectPath& object_path) = 0;
- // Issues a request to read the value of GATT descriptor with object path
- // |object_path| and returns the value in |callback| on success. On error,
- // invokes |error_callback|.
- virtual void ReadValue(const dbus::ObjectPath& object_path,
- ValueCallback callback,
- ErrorCallback error_callback) = 0;
- // Issues a request to write the value of GATT descriptor with object path
- // |object_path| with value |value|. Invokes |callback| on success and
- // |error_callback| on failure.
- virtual void WriteValue(const dbus::ObjectPath& object_path,
- const std::vector<uint8_t>& value,
- base::OnceClosure callback,
- ErrorCallback error_callback) = 0;
- // Creates the instance.
- static BluetoothGattDescriptorClient* Create();
- // Constants used to indicate exceptional error conditions.
- static const char kNoResponseError[];
- static const char kUnknownDescriptorError[];
- protected:
- BluetoothGattDescriptorClient();
- };
- } // namespace bluez
- #endif // DEVICE_BLUETOOTH_DBUS_BLUETOOTH_GATT_DESCRIPTOR_CLIENT_H_
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