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1 //
2 //  Copyright 2015 Google, Inc.
3 //
4 //  Licensed under the Apache License, Version 2.0 (the "License");
5 //  you may not use this file except in compliance with the License.
6 //  You may obtain a copy of the License at:
7 //
8 //  http://www.apache.org/licenses/LICENSE-2.0
9 //
10 //  Unless required by applicable law or agreed to in writing, software
11 //  distributed under the License is distributed on an "AS IS" BASIS,
12 //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 //  See the License for the specific language governing permissions and
14 //  limitations under the License.
15 //
16 
17 #include "service/gatt_client.h"
18 
19 #include <base/logging.h>
20 
21 using std::lock_guard;
22 using std::mutex;
23 
24 namespace bluetooth {
25 
26 // GattClient implementation
27 // ========================================================
28 
GattClient(const Uuid & uuid,int client_id)29 GattClient::GattClient(const Uuid& uuid, int client_id)
30     : app_identifier_(uuid), client_id_(client_id) {}
31 
~GattClient()32 GattClient::~GattClient() {
33   // Automatically unregister the client.
34   VLOG(1) << "GattClient unregistering client: " << client_id_;
35 
36   hal::BluetoothGattInterface::Get()
37       ->GetClientHALInterface()
38       ->unregister_client(client_id_);
39 }
40 
GetAppIdentifier() const41 const Uuid& GattClient::GetAppIdentifier() const { return app_identifier_; }
42 
GetInstanceId() const43 int GattClient::GetInstanceId() const { return client_id_; }
44 
45 // GattClientFactory implementation
46 // ========================================================
47 
GattClientFactory()48 GattClientFactory::GattClientFactory() {
49   hal::BluetoothGattInterface::Get()->AddClientObserver(this);
50 }
51 
~GattClientFactory()52 GattClientFactory::~GattClientFactory() {
53   hal::BluetoothGattInterface::Get()->RemoveClientObserver(this);
54 }
55 
RegisterInstance(const Uuid & uuid,const RegisterCallback & callback)56 bool GattClientFactory::RegisterInstance(const Uuid& uuid,
57                                          const RegisterCallback& callback) {
58   VLOG(1) << __func__ << " - Uuid: " << uuid.ToString();
59   lock_guard<mutex> lock(pending_calls_lock_);
60 
61   if (pending_calls_.find(uuid) != pending_calls_.end()) {
62     LOG(ERROR) << "GATT client with given Uuid already registered - "
63                << "Uuid: " << uuid.ToString();
64     return false;
65   }
66 
67   const btgatt_client_interface_t* hal_iface =
68       hal::BluetoothGattInterface::Get()->GetClientHALInterface();
69 
70   if (hal_iface->register_client(uuid) != BT_STATUS_SUCCESS) return false;
71 
72   pending_calls_[uuid] = callback;
73 
74   return true;
75 }
76 
RegisterClientCallback(hal::BluetoothGattInterface *,int status,int client_id,const Uuid & app_uuid)77 void GattClientFactory::RegisterClientCallback(
78     hal::BluetoothGattInterface* /* gatt_iface */, int status, int client_id,
79     const Uuid& app_uuid) {
80   Uuid uuid(app_uuid);
81 
82   auto iter = pending_calls_.find(uuid);
83   if (iter == pending_calls_.end()) {
84     VLOG(1) << "Ignoring callback for unknown app_id: " << uuid.ToString();
85     return;
86   }
87 
88   bool success = (status == BT_STATUS_SUCCESS);
89   BLEStatus result = success ? BLE_STATUS_SUCCESS : BLE_STATUS_FAILURE;
90 
91   // No need to construct a client if the call wasn't successful.
92   std::unique_ptr<GattClient> client;
93   if (success) client.reset(new GattClient(uuid, client_id));
94 
95   // Notify the result via the result callback.
96   iter->second(result, uuid, std::move(client));
97 
98   pending_calls_.erase(iter);
99 }
100 
101 }  // namespace bluetooth
102