bluetooth: Subscribe to notifications

content/renderer/bluetooth/bluetooth_dispatcher.h

 // 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 CONTENT_CHILD_BLUETOOTH_BLUETOOTH_DISPATCHER_H_
 #define CONTENT_CHILD_BLUETOOTH_BLUETOOTH_DISPATCHER_H_
 
 #include "base/id_map.h"
 #include "base/memory/ref_counted.h"
 #include "content/common/bluetooth/bluetooth_device.h"
 #include "content/public/child/worker_thread.h"
 #include "third_party/WebKit/public/platform/modules/bluetooth/WebBluetooth.h"
 #include "third_party/WebKit/public/platform/modules/bluetooth/WebBluetoothError.h"
 
 namespace base {
 class MessageLoop;
 class TaskRunner;
 }
 
+namespace blink {
+class WebBluetoothGATTCharacteristicDelegate;
+}
+
 namespace IPC {
 class Message;
 }
 
 struct BluetoothCharacteristicRequest;
 struct BluetoothPrimaryServiceRequest;
+struct BluetoothNotificationsRequest;
 
 namespace content {
 class ThreadSafeSender;
 
 // Dispatcher for child process threads which communicates to the browser's
 // BluetoothDispatcherHost.
 //
 // Instances are created for each thread as necessary by WebBluetoothImpl.
 //
 // Incoming IPC messages are received by the BluetoothMessageFilter and
@@ skipping 26 matching lines @@
 
   void getCharacteristic(
       const blink::WebString& service_instance_id,
       const blink::WebString& characteristic_uuid,
       blink::WebBluetoothGetCharacteristicCallbacks* callbacks);
   void readValue(const blink::WebString& characteristic_instance_id,
                  blink::WebBluetoothReadValueCallbacks* callbacks);
   void writeValue(const blink::WebString& characteristic_instance_id,
                   const std::vector<uint8_t>& value,
                   blink::WebBluetoothWriteValueCallbacks*);
+  void startNotifications(
+      const blink::WebString& characteristic_instance_id,
+      blink::WebBluetoothGATTCharacteristicDelegate* delegate,
+      blink::WebBluetoothNotificationsCallbacks*);
+  void stopNotifications(
+      const blink::WebString& characteristic_instance_id,
+      blink::WebBluetoothGATTCharacteristicDelegate* delegate,
+      blink::WebBluetoothNotificationsCallbacks*);
+  void characteristicDelegateRemoved(
+      const blink::WebString& characteristic_instance_id,
+      blink::WebBluetoothGATTCharacteristicDelegate* delegate);
 
   // WorkerThread::Observer implementation.
   void WillStopCurrentWorkerThread() override;
 
  private:
+  bool IsActiveCharacteristicNotification(

[Jeffrey Yasskin, 2015/09/15 03:45:37]

Maybe s/Is/Has/?

[ortuno, 2015/09/15 21:38:20]

Done.

+      const blink::WebString& characteristic_instance_id);
+
+  void AddToActiveNotificationsMap(
+      const blink::WebString& characteristic_instance_id,
+      blink::WebBluetoothGATTCharacteristicDelegate* delegate);
+
+  void RemoveFromActiveNotificationsMap(
+      const blink::WebString& characteristic_instance_id,
+      blink::WebBluetoothGATTCharacteristicDelegate* delegate);
+
   // IPC Handlers, see definitions in bluetooth_messages.h.
   void OnRequestDeviceSuccess(int thread_id,
                               int request_id,
                               const BluetoothDevice& device);
   void OnRequestDeviceError(int thread_id,
                             int request_id,
                             blink::WebBluetoothError error);
 
   void OnConnectGATTSuccess(int thread_id,
                             int request_id,
@@ skipping 18 matching lines @@
   void OnReadValueSuccess(int thread_id,
                           int request_id,
                           const std::vector<uint8_t>& value);
   void OnReadValueError(int thread_id,
                         int request_id,
                         blink::WebBluetoothError error);
   void OnWriteValueSuccess(int thread_id, int request_id);
   void OnWriteValueError(int thread_id,
                          int request_id,
                          blink::WebBluetoothError error);
+  void OnStartNotificationsSuccess(int thread_id, int request_id);
+  void OnStartNotificationsError(int thread_id,
+                                 int request_id,
+                                 blink::WebBluetoothError error);
+  void OnStopNotificationsSuccess(int thread_id, int request_id);
 
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
 
+  // Map that keeps track of which characteristic are subscribed to

[Jeffrey Yasskin, 2015/09/15 03:45:37]

Mention that the keys are characteristic UUIDs.

[ortuno, 2015/09/15 21:38:20]

You mean instance IDs right? Multiple characteristic could have the same UUID.

+  // notifications.
+  std::map<std::string,
+           std::set<blink::WebBluetoothGATTCharacteristicDelegate*>>
+      active_characteristic_notifications;
+
   // Tracks device requests sent to browser to match replies with callbacks.
   // Owns callback objects.
   IDMap<blink::WebBluetoothRequestDeviceCallbacks, IDMapOwnPointer>
       pending_requests_;
   // Tracks requests to connect to a device.
   // Owns callback objects.
   IDMap<blink::WebBluetoothConnectGATTCallbacks, IDMapOwnPointer>
       pending_connect_requests_;
   // Tracks requests to get a primary service from a device.
   // Owns request objects.
   IDMap<BluetoothPrimaryServiceRequest, IDMapOwnPointer>
       pending_primary_service_requests_;
   // Tracks requests to get a characteristic from a service.
   IDMap<BluetoothCharacteristicRequest, IDMapOwnPointer>
       pending_characteristic_requests_;
   // Tracks requests to read from a characteristics.
   IDMap<blink::WebBluetoothReadValueCallbacks, IDMapOwnPointer>
       pending_read_value_requests_;
   IDMap<blink::WebBluetoothWriteValueCallbacks, IDMapOwnPointer>
       pending_write_value_requests_;
+  // Tracks requests to start notifications from a characteristic.
+  IDMap<BluetoothNotificationsRequest, IDMapOwnPointer>
+      pending_start_notifications_requests_;
+  // Tracks requests to stop notifications from a characteristic.
+  IDMap<BluetoothNotificationsRequest, IDMapOwnPointer>
+      pending_stop_notifications_requests_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothDispatcher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_BLUETOOTH_BLUETOOTH_DISPATCHER_H_