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265 lines
11 KiB
265 lines
11 KiB
//
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// Copyright 2015 Google, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at:
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#pragma once
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#include <mutex>
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#include <unordered_set>
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#include <vector>
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#include <base/macros.h>
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#include <hardware/bluetooth.h>
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#include <hardware/bt_gatt.h>
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namespace bluetooth {
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namespace hal {
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// This class represents the standard BT-GATT interface. This class combines
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// GATT profile server and client role operations with general GAP profile
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// operations of various roles (central, scanner, peripheral, advertiser),
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// wrapping around the underlying bt_gatt_interface_t structure. A single
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// instance of this class exists per application and it allows multiple classes
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// to interface with the global HAL interface by multiplexing callbacks among
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// registered clients.
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//
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// This is declared as an abstract interface so that a fake implementation can
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// be injected for testing the upper layer.
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class BluetoothGattInterface {
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public:
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// The HAL interface doesn't allow registering "user data" that carries
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// context beyond the callback parameters, forcing implementations to deal
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// with global variables. The *Observer interface is to redirect these events
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// to interested parties in an object-oriented manner.
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// The standard LE scanner callback interface.
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class ScannerObserver {
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public:
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virtual ~ScannerObserver() = default;
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// All of the events below correspond to callbacks defined in
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// "btgatt_scanner_callbacks_t" in the HAL API definitions.
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virtual void ScanResultCallback(
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BluetoothGattInterface* gatt_iface, const RawAddress& bda, int rssi,
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std::vector<uint8_t> adv_data); // NOLINT(pass-by-value)
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};
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// The standard BT-GATT client callback interface.
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class ClientObserver {
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public:
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virtual ~ClientObserver() = default;
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// All of the events below correspond to callbacks defined in
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// "bt_gatt_client_callbacks_t" in the HAL API definitions.
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virtual void RegisterClientCallback(BluetoothGattInterface* gatt_iface,
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int status, int client_if,
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const bluetooth::Uuid& app_uuid);
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virtual void ConnectCallback(BluetoothGattInterface* gatt_iface,
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int conn_id, int status, int client_if,
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const RawAddress& bda);
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virtual void DisconnectCallback(BluetoothGattInterface* gatt_iface,
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int conn_id, int status, int client_if,
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const RawAddress& bda);
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virtual void SearchCompleteCallback(BluetoothGattInterface* gatt_iface,
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int conn_id, int status);
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virtual void RegisterForNotificationCallback(
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BluetoothGattInterface* gatt_iface, int conn_id, int registered,
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int status, uint16_t handle);
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virtual void NotifyCallback(BluetoothGattInterface* gatt_iface, int conn_id,
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const btgatt_notify_params_t& p_data);
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virtual void WriteCharacteristicCallback(BluetoothGattInterface* gatt_iface,
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int conn_id, int status,
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uint16_t handle);
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virtual void WriteDescriptorCallback(BluetoothGattInterface* gatt_iface,
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int conn_id, int status,
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uint16_t handle);
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virtual void MtuChangedCallback(BluetoothGattInterface* gatt_iface,
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int conn_id, int status, int mtu);
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virtual void GetGattDbCallback(BluetoothGattInterface* gatt_iface,
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int conn_id,
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const btgatt_db_element_t* gatt_db,
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int size);
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virtual void ServicesRemovedCallback(BluetoothGattInterface* gatt_iface,
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int conn_id, uint16_t start_handle,
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uint16_t end_handle);
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virtual void ServicesAddedCallback(BluetoothGattInterface* gatt_iface,
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int conn_id,
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const btgatt_db_element_t& added,
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int added_count);
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};
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// The standard BT-GATT server callback interface.
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class ServerObserver {
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public:
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virtual ~ServerObserver() = default;
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virtual void RegisterServerCallback(BluetoothGattInterface* gatt_iface,
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int status, int server_if,
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const bluetooth::Uuid& app_uuid);
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virtual void ConnectionCallback(BluetoothGattInterface* gatt_iface,
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int conn_id, int server_if, int connected,
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const RawAddress& bda);
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virtual void ServiceAddedCallback(
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BluetoothGattInterface* gatt_iface, int status, int server_if,
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std::vector<btgatt_db_element_t> service); // NOLINT(pass-by-value)
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virtual void ServiceStoppedCallback(BluetoothGattInterface* gatt_iface,
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int status, int server_if,
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int srvc_handle);
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virtual void ServiceDeletedCallback(BluetoothGattInterface* gatt_iface,
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int status, int server_if,
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int srvc_handle);
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virtual void RequestReadCharacteristicCallback(
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BluetoothGattInterface* gatt_iface, int conn_id, int trans_id,
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const RawAddress& bda, int attr_handle, int offset, bool is_long);
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virtual void RequestReadDescriptorCallback(
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BluetoothGattInterface* gatt_iface, int conn_id, int trans_id,
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const RawAddress& bda, int attr_handle, int offset, bool is_long);
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virtual void RequestWriteCharacteristicCallback(
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BluetoothGattInterface* gatt_iface, int conn_id, int trans_id,
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const RawAddress& bda, int attr_handle, int offset, bool need_rsp,
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bool is_prep,
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std::vector<uint8_t> value); // NOLINT(pass-by-value)
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virtual void RequestWriteDescriptorCallback(
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BluetoothGattInterface* gatt_iface, int conn_id, int trans_id,
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const RawAddress& bda, int attr_handle, int offset, bool need_rsp,
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bool is_prep,
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std::vector<uint8_t> value); // NOLINT(pass-by-alue)
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virtual void RequestExecWriteCallback(BluetoothGattInterface* gatt_iface,
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int conn_id, int trans_id,
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const RawAddress& bda,
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int exec_write);
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virtual void ResponseConfirmationCallback(
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BluetoothGattInterface* gatt_iface, int status, int handle);
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virtual void IndicationSentCallback(BluetoothGattInterface* gatt_iface,
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int conn_id, int status);
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virtual void MtuChangedCallback(BluetoothGattInterface* gatt_iface,
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int conn_id, int mtu);
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};
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// Initialize and clean up the BluetoothInterface singleton. Returns false if
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// the underlying HAL interface failed to initialize, and true on success.
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static bool Initialize();
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// Shuts down and cleans up the interface. CleanUp must be called on the same
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// thread that called Initialize.
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static void CleanUp();
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// Returns true if the interface was initialized and a global singleton has
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// been created.
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static bool IsInitialized();
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// Initialize for testing. Use this to inject a test version of
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// BluetoothGattInterface. To be used from unit tests only.
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static void InitializeForTesting(BluetoothGattInterface* test_instance);
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// Returns the BluetoothGattInterface singleton. If the interface has
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// not been initialized, returns nullptr. This method is thread-safe, in that
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// it will block if the internal lock is being held by another thread. Don't
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// call this re-entrantly from an observer event as this may cause a deadlock.
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static BluetoothGattInterface* Get();
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// Add or remove an observer that is interested in LE scanner interface
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// notifications from us. Thread-safety is guaranteed by ObserverList.
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virtual void AddScannerObserver(ScannerObserver* observer) = 0;
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virtual void RemoveScannerObserver(ScannerObserver* observer) = 0;
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// Add or remove an observer that is interested in GATT client interface
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// notifications from us. Thread-safety is guaranteed by ObserverList.
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virtual void AddClientObserver(ClientObserver* observer) = 0;
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virtual void RemoveClientObserver(ClientObserver* observer) = 0;
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// Add or remove an observer that is interested in GATT server interface
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// notifications from us. Thread-safety is guaranteed by ObserverList.
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virtual void AddServerObserver(ServerObserver* observer) = 0;
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virtual void RemoveServerObserver(ServerObserver* observer) = 0;
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// The HAL module pointer that represents the standard BT LE advertiser
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// interface. This is implemented in and provided by the shared Bluetooth
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// library, so this isn't owned by us.
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//
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// Upper layers can make ble_advertiser_interface_t API calls through this
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// structure.
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virtual BleAdvertiserInterface* GetAdvertiserHALInterface() const = 0;
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// The HAL module pointer that represents the standard BT LE scanner
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// interface. This is implemented in and provided by the shared Bluetooth
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// library, so this isn't owned by us.
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//
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// Upper layers can make ble_scanner_interface_t API calls through this
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// structure.
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virtual BleScannerInterface* GetScannerHALInterface() const = 0;
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// The HAL module pointer that represents the standard BT-GATT client
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// interface. This is implemented in and provided by the shared Bluetooth
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// library, so this isn't owned by us.
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//
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// Upper layers can make btgatt_client_interface_t API calls through this
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// structure.
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virtual const btgatt_client_interface_t* GetClientHALInterface() const = 0;
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// The HAL module pointer that represents the standard BT-GATT server
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// interface. This is implemented in and provided by the shared Bluetooth
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// library, so this isn't owned by us.
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//
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// Upper layers can make btgatt_server_interface_t API calls through this
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// structure.
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virtual const btgatt_server_interface_t* GetServerHALInterface() const = 0;
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// Initiates a regular BLE device scan. This is called internally from each
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// LowEnergyClient. This function synchronizes the scan requests and maintains
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// an internal reference count for each scan client that is interested.
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bt_status_t StartScan(int client_id);
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bt_status_t StopScan(int client_id);
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protected:
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BluetoothGattInterface() = default;
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virtual ~BluetoothGattInterface() = default;
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private:
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// Used to keep a reference count for the different BLE scan clients.
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std::mutex scan_clients_lock_;
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std::unordered_set<int> scan_client_set_;
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DISALLOW_COPY_AND_ASSIGN(BluetoothGattInterface);
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};
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} // namespace hal
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} // namespace bluetooth
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