bluetooth: Add Device connection logic and accompanying user interface.

device/bluetooth/device.h

 // Copyright 2016 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 DEVICE_BLUETOOTH_DEVICE_H_
 #define DEVICE_BLUETOOTH_DEVICE_H_
 
+#include <memory>
 #include <string>
+#include <vector>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "device/bluetooth/bluetooth_adapter.h"
 #include "device/bluetooth/bluetooth_device.h"
+#include "device/bluetooth/bluetooth_gatt_connection.h"
+#include "device/bluetooth/bluetooth_remote_gatt_service.h"
 #include "device/bluetooth/public/interfaces/device.mojom.h"
+#include "mojo/public/cpp/bindings/binding.h"
 
 namespace bluetooth {
 
 // Implementation of Mojo Device located in
 // device/bluetooth/public/interfaces/device.mojom.
 // It handles requests to interact with Bluetooth Device.
 // Uses the platform abstraction of device/bluetooth.
-class Device : public mojom::Device {
+// Instances of this class are constructed by Adapter and are bound to their
+// MessagePipe and BluetoothGattConnection lifetimes. In the case where either
+// the MessagePipe or BluetoothGattConnection dies, the instance deletes itself.
+class Device : public mojom::Device, public device::BluetoothAdapter::Observer {
  public:
-  Device(const std::string& address,
-         scoped_refptr<device::BluetoothAdapter> adapter);
+  Device(scoped_refptr<device::BluetoothAdapter> adapter,
+         std::unique_ptr<device::BluetoothGattConnection> connection,
+         mojom::DeviceRequest request);
   ~Device() override;
 
   // Creates a mojom::DeviceInfo using info from the given |device|.
   static mojom::DeviceInfoPtr ConstructDeviceInfoStruct(
       const device::BluetoothDevice* device);
 
+  // Registers a handler to receive error notifications.
+  //
+  // The default connection error handler is the Disconnect function. Changing
+  // the connection error handler prevents the Device from destroying itself
+  // after Mojo binding connection errors, so callers of this function should
+  // be prepared to cleanup Device unless the BluetoothGattConnection is
+  // dropped.
+  void set_connection_error_handler(const base::Closure& closure);

[ortuno, 2016/11/01 06:27:39]

Why do you need to expose this? Also since it's only used in tests, this should
be called SetConnectionErrorHandlerForTesting.

[mbrunson, 2016/11/02 01:25:46]

I was getting segfaults when calling Device functions before I added it. I've
changed the structure of the tests so I shouldn't need this function anymore.

+
+  // BluetoothAdapter::Observer overrides:
+  void DeviceChanged(device::BluetoothAdapter* adapter,
+                     device::BluetoothDevice* device) override;
+  void GattServicesDiscovered(device::BluetoothAdapter* adapter,
+                              device::BluetoothDevice* device) override;
+
   // mojom::Device overrides:
+  void Disconnect() override;
   void GetInfo(const GetInfoCallback& callback) override;
+  void GetServices(const GetServicesCallback& callback) override;
 
  private:
-  // The address of the Bluetooth device.
-  std::string address_;
+  void GetServicesImpl(const GetServicesCallback& callback);
+
+  mojom::ServiceInfoPtr ConstructServiceInfoStruct(
+      const device::BluetoothRemoteGattService* service);
+
+  std::string GetAddress();

[ortuno, 2016/11/01 06:27:39]

hmm I might be missing something but it seems this could return a const &.

[mbrunson, 2016/11/02 01:25:46]

Ah yes. It should be. Done.

 
   // The current BluetoothAdapter.
   scoped_refptr<device::BluetoothAdapter> adapter_;
 
+  // The GATT connection to this device.
+  std::unique_ptr<device::BluetoothGattConnection> connection_;
+
+  // The services request queue which holds callbacks that are waiting for
+  // services to be discovered for this device.
+  std::vector<base::Closure> pending_services_requests_;
+
+  mojo::Binding<mojom::Device> binding_;
+
   DISALLOW_COPY_AND_ASSIGN(Device);
 };
 
 }  // namespace bluetooth
 
 #endif  // DEVICE_BLUETOOTH_DEVICE_H_