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297 lines
14 KiB
297 lines
14 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 <deque>
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#include <functional>
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#include <mutex>
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#include <string>
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#include <unordered_map>
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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 <bluetooth/uuid.h>
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#include "service/bluetooth_instance.h"
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#include "service/common/bluetooth/service.h"
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#include "service/hal/bluetooth_gatt_interface.h"
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namespace bluetooth {
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// A GattServer instance represents an application's handle to perform GATT
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// server-role operations. Instances cannot be created directly and should be
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// obtained through the factory.
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class GattServer : public BluetoothInstance,
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private hal::BluetoothGattInterface::ServerObserver {
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public:
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// Delegate interface is used to handle incoming requests and confirmations
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// for a GATT service.
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class Delegate {
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public:
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Delegate() = default;
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virtual ~Delegate() = default;
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// Called when there is an incoming read request for the characteristic with
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// ID |characteristic_id| from a remote device with address
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// |device_address|. |request_id| can be used to respond to this request by
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// calling SendResponse below.
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virtual void OnCharacteristicReadRequest(GattServer* gatt_server,
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const std::string& device_address,
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int request_id, int offset,
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bool is_long, uint16_t handle) = 0;
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// Called when there is an incoming read request for the descriptor with
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// ID |descriptor_id| from a remote device with address |device_address|.
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// |request_id| can be used to respond to this request by
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// calling SendResponse below.
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virtual void OnDescriptorReadRequest(GattServer* gatt_server,
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const std::string& device_address,
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int request_id, int offset,
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bool is_long, uint16_t handle) = 0;
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// Called when there is an incoming write request for the characteristic
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// with ID |characteristic_id| from a remote device with address
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// |device_address|. |request_id| can be used to respond to this request by
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// calling SendResponse, if the |need_response| parameter is true. Otherwise
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// this is a "Write Without Reponse" procedure and SendResponse will fail.
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// If |is_prepare_write| is true, then the write should not be committed
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// immediately as this is a "Prepared Write Request". Instead, the Delegate
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// should hold on to the value and either discard it or complete the write
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// when it receives the OnExecuteWriteRequest event.
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virtual void OnCharacteristicWriteRequest(
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GattServer* gatt_server, const std::string& device_address,
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int request_id, int offset, bool is_prepare_write, bool need_response,
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const std::vector<uint8_t>& value, uint16_t handle) = 0;
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// Called when there is an incoming write request for the descriptor
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// with ID |descriptor_id| from a remote device with address
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// |device_address|. |request_id| can be used to respond to this request by
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// calling SendResponse, if the |need_response| parameter is true. Otherwise
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// this is a "Write Without Response" procedure and SendResponse will fail.
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// If |is_prepare_write| is true, then the write should not be committed
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// immediately as this is a "Prepared Write Request". Instead, the Delegate
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// should hold on to the value and either discard it or complete the write
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// when it receives the OnExecuteWriteRequest event.
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virtual void OnDescriptorWriteRequest(
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GattServer* gatt_server, const std::string& device_address,
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int request_id, int offset, bool is_prepare_write, bool need_response,
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const std::vector<uint8_t>& value, uint16_t handle) = 0;
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// Called when there is an incoming "Execute Write Request". If |is_execute|
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// is true, then the Delegate should commit all previously prepared writes.
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// Otherwise, all prepared writes should be aborted. The Delegate should
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// call "SendResponse" to complete the procedure.
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virtual void OnExecuteWriteRequest(GattServer* gatt_server,
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const std::string& device_address,
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int request_id, bool is_execute) = 0;
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virtual void OnConnectionStateChanged(GattServer* gatt_server,
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const std::string& device_addres,
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bool connected) = 0;
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private:
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DISALLOW_COPY_AND_ASSIGN(Delegate);
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};
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// The desctructor automatically unregisters this instance from the stack.
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~GattServer() override;
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// Assigns a delegate to this instance. |delegate| must out-live this
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// GattServer instance.
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void SetDelegate(Delegate* delegate);
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// BluetoothClientInstace overrides:
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const Uuid& GetAppIdentifier() const override;
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int GetInstanceId() const override;
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// Callback type used to report the status of an asynchronous GATT server
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// operation.
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using ResultCallback =
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std::function<void(BLEStatus status, const Service& id)>;
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using GattCallback = std::function<void(GATTError error)>;
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// Add service declaration. This method immediately
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// returns false if a service hasn't been started. Otherwise, |callback| will
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// be called asynchronously with the result of the operation.
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//
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// TODO(armansito): It is unclear to me what it means for this function to
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// fail. What is the state that we're in? Is the service declaration over so
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// we can add other services to this server instance? Do we need to clean up
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// all the entries or does the upper-layer need to remove the service? Or are
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// we in a stuck-state where the service declaration hasn't ended?
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bool AddService(const Service&, const ResultCallback& callback);
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// Sends a response for a pending notification. |request_id| and
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// |device_address| should match those that were received through one of the
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// Delegate callbacks. |value| and |offset| are used for read requests and
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// prepare write requests and should match the value of the attribute. Returns
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// false if the pending request could not be resolved using the given
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// parameters or if the call to the underlying stack fails.
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bool SendResponse(const std::string& device_address, int request_id,
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GATTError error, int offset,
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const std::vector<uint8_t>& value);
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// Sends an ATT Handle-Value Notification to the device with BD_ADDR
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// |device_address| for the characteristic with handle |handle| and
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// value |value|. If |confirm| is true, then an ATT Handle-Value Indication
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// will be sent instead, which requires the remote to confirm receipt. Returns
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// false if there was an immediate error in initiating the notification
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// procedure. Otherwise, returns true and reports the asynchronous result of
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// the operation in |callback|.
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//
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// If |confirm| is true, then |callback| will be run when the remote device
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// sends a ATT Handle-Value Confirmation packet. Otherwise, it will be run as
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// soon as the notification has been sent out.
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bool SendNotification(const std::string& device_address,
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const uint16_t handle, bool confirm,
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const std::vector<uint8_t>& value,
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const GattCallback& callback);
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private:
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friend class GattServerFactory;
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// Used for the internal remote connection tracking. Keeps track of the
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// request ID and the device address for the connection. If |request_id| is -1
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// then no ATT read/write request is currently pending.
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struct Connection {
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Connection(int conn_id, const RawAddress& bdaddr)
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: conn_id(conn_id), bdaddr(bdaddr) {}
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Connection() : conn_id(-1) { memset(&bdaddr, 0, sizeof(bdaddr)); }
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int conn_id;
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std::unordered_map<int, int> request_id_to_handle;
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RawAddress bdaddr;
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};
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// Used to keep track of a pending Handle-Value indication.
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struct PendingIndication {
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explicit PendingIndication(const GattCallback& callback)
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: has_success(false), callback(callback) {}
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bool has_success;
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GattCallback callback;
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};
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// Constructor shouldn't be called directly as instances are meant to be
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// obtained from the factory.
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GattServer(const Uuid& uuid, int server_id);
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// hal::BluetoothGattInterface::ServerObserver overrides:
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void ConnectionCallback(hal::BluetoothGattInterface* gatt_iface, int conn_id,
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int server_id, int connected,
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const RawAddress& bda) override;
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void ServiceAddedCallback(hal::BluetoothGattInterface* gatt_iface, int status,
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int server_if,
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std::vector<btgatt_db_element_t>) override;
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void ServiceStoppedCallback(hal::BluetoothGattInterface* gatt_iface,
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int status, int server_id,
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int service_handle) override;
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void RequestReadCharacteristicCallback(
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hal::BluetoothGattInterface* gatt_iface, int conn_id, int trans_id,
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const RawAddress& bda, int attribute_handle, int offset,
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bool is_long) override;
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void RequestReadDescriptorCallback(hal::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 attribute_handle, int offset,
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bool is_long) override;
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void RequestWriteCharacteristicCallback(
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hal::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, std::vector<uint8_t> value) override;
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void RequestWriteDescriptorCallback(hal::BluetoothGattInterface* gatt_iface,
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int conn_id, int trans_id,
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const RawAddress& bda, int attr_handle,
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int offset, bool need_rsp, bool is_prep,
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std::vector<uint8_t> value) override;
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void RequestExecWriteCallback(hal::BluetoothGattInterface* gatt_iface,
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int conn_id, int trans_id,
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const RawAddress& bda, int exec_write) override;
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void IndicationSentCallback(hal::BluetoothGattInterface* gatt_iface,
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int conn_id, int status) override;
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// Helper function that notifies and clears the pending callback.
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void CleanUpPendingData();
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// Handles the next attribute entry in the pending service declaration.
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void HandleNextEntry(hal::BluetoothGattInterface* gatt_iface);
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// Helper method that returns a pointer to an internal Connection instance
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// that matches the given parameters.
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std::shared_ptr<Connection> GetConnection(int conn_id, const RawAddress& bda,
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int request_id);
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// See getters for documentation.
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Uuid app_identifier_;
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int server_id_;
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// Mutex that synchronizes access to the entries below.
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std::mutex mutex_;
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ResultCallback pending_end_decl_cb_;
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// GATT connection mappings from stack-provided "conn_id" IDs and remote
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// device addresses to Connection structures. The conn_id map is one-to-one
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// while the conn_addr map is one to many, as a remote device may support
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// multiple transports (BR/EDR & LE) and use the same device address for both.
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std::unordered_map<int, std::shared_ptr<Connection>> conn_id_map_;
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std::unordered_map<std::string, std::vector<std::shared_ptr<Connection>>>
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conn_addr_map_;
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// Connections for which a Handle-Value indication is pending. Since there can
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// be multiple indications to the same device (in the case of a dual-mode
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// device with simulatenous BR/EDR & LE GATT connections), we also keep track
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// of whether there has been at least one successful confirmation.
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std::unordered_map<int, std::shared_ptr<PendingIndication>>
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pending_indications_;
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// Raw handle to the Delegate, which must outlive this GattServer instance.
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Delegate* delegate_;
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DISALLOW_COPY_AND_ASSIGN(GattServer);
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};
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// GattServerFactory is used to register and obtain a per-application GattServer
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// instance. Users should call RegisterClient to obtain their own unique
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// GattServer instance that has been registered with the Bluetooth stack.
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class GattServerFactory : public BluetoothInstanceFactory,
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private hal::BluetoothGattInterface::ServerObserver {
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public:
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// Don't construct/destruct directly except in tests. Instead, obtain a handle
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// from an Adapter instance.
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GattServerFactory();
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~GattServerFactory() override;
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// BluetoothInstanceFactory override:
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bool RegisterInstance(const Uuid& uuid,
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const RegisterCallback& callback) override;
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private:
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// hal::BluetoothGattInterface::ServerObserver override:
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void RegisterServerCallback(hal::BluetoothGattInterface* gatt_iface,
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int status, int server_id,
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const Uuid& app_uuid) override;
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// Map of pending calls to register.
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std::mutex pending_calls_lock_;
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std::unordered_map<Uuid, RegisterCallback> pending_calls_;
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DISALLOW_COPY_AND_ASSIGN(GattServerFactory);
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};
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} // namespace bluetooth
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