1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_CONNECTION_H
6#define COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_CONNECTION_H
7
8#include <string>
9
10#include "base/memory/ref_counted.h"
11#include "base/memory/weak_ptr.h"
12#include "components/proximity_auth/connection.h"
13#include "device/bluetooth/bluetooth_adapter.h"
14#include "device/bluetooth/bluetooth_device.h"
15#include "device/bluetooth/bluetooth_socket.h"
16#include "device/bluetooth/bluetooth_uuid.h"
17
18namespace net {
19class IOBuffer;
20}
21
22namespace proximity_auth {
23
24struct RemoteDevice;
25
26// Represents a Bluetooth connection with a remote device. The connection is a
27// persistent bidirectional channel for sending and receiving wire messages.
28class BluetoothConnection : public Connection,
29                            public device::BluetoothAdapter::Observer {
30 public:
31  // Constructs a Bluetooth connection to the service with |uuid| on the
32  // |remote_device|. The |remote_device| must already be known to the system
33  // Bluetooth daemon.
34  BluetoothConnection(const RemoteDevice& remote_device,
35                      const device::BluetoothUUID& uuid);
36  virtual ~BluetoothConnection();
37
38 protected:
39  // Connection:
40  virtual void Connect() OVERRIDE;
41  virtual void Disconnect() OVERRIDE;
42  virtual void SendMessageImpl(scoped_ptr<WireMessage> message) OVERRIDE;
43
44  // BluetoothAdapter::Observer:
45  virtual void DeviceRemoved(device::BluetoothAdapter* adapter,
46                             device::BluetoothDevice* device) OVERRIDE;
47
48  // Exposed for testing.
49  virtual void ConnectToService(
50      device::BluetoothDevice* device,
51      const device::BluetoothUUID& uuid,
52      const device::BluetoothDevice::ConnectToServiceCallback& callback,
53      const device::BluetoothDevice::ConnectToServiceErrorCallback&
54          error_callback);
55
56 private:
57  // Registers receive callbacks with the backing |socket_|.
58  void StartReceive();
59
60  // Callbacks for asynchronous Bluetooth operations.
61  void OnAdapterInitialized(scoped_refptr<device::BluetoothAdapter> adapter);
62  void OnConnected(scoped_refptr<device::BluetoothSocket> socket);
63  void OnConnectionError(const std::string& error_message);
64  void OnSend(int bytes_sent);
65  void OnSendError(const std::string& error_message);
66  void OnReceive(int bytes_received, scoped_refptr<net::IOBuffer> buffer);
67  void OnReceiveError(device::BluetoothSocket::ErrorReason error_reason,
68                      const std::string& error_message);
69
70  // The UUID (universally unique identifier) of the Bluetooth service on the
71  // remote device that |this| connection should connect to.
72  const device::BluetoothUUID uuid_;
73
74  // The Bluetooth adapter over which this connection is made. Non-null iff
75  // |this| connection is registered as an observer of the |adapter_|.
76  scoped_refptr<device::BluetoothAdapter> adapter_;
77
78  // The Bluetooth socket that backs this connection. NULL iff the connection is
79  // not in a connected state.
80  scoped_refptr<device::BluetoothSocket> socket_;
81
82  // The message that was sent over the backing |socket_|. NULL iff there is no
83  // send operation in progress.
84  scoped_ptr<WireMessage> pending_message_;
85
86  base::WeakPtrFactory<BluetoothConnection> weak_ptr_factory_;
87
88  DISALLOW_COPY_AND_ASSIGN(BluetoothConnection);
89};
90
91}  // namespace proximity_auth
92
93#endif  // COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_CONNECTION_H
94