device/bluetooth: Implement BluetoothGattConnection on Chrome OS.

device/bluetooth/bluetooth_gatt_connection_chromeos.cc

+// 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.
+
+#include "device/bluetooth/bluetooth_gatt_connection_chromeos.h"
+
+#include "base/bind.h"
+#include "base/logging.h"
+#include "chromeos/dbus/dbus_thread_manager.h"
+#include "device/bluetooth/bluetooth_adapter.h"
+#include "device/bluetooth/bluetooth_device.h"
+
+namespace chromeos {
+
+BluetoothGattConnectionChromeOS::BluetoothGattConnectionChromeOS(
+    scoped_refptr<device::BluetoothAdapter> adapter,
+    const std::string& device_address,
+    const dbus::ObjectPath& object_path)
+    : connected_(true),
+      adapter_(adapter),
+      device_address_(device_address),
+      object_path_(object_path) {
+  DCHECK(adapter_.get());
+  DCHECK(!device_address_.empty());
+  DCHECK(object_path_.IsValid());
+
+  DBusThreadManager::Get()->GetBluetoothDeviceClient()->AddObserver(this);
+}
+
+BluetoothGattConnectionChromeOS::~BluetoothGattConnectionChromeOS() {
+  DBusThreadManager::Get()->GetBluetoothDeviceClient()->RemoveObserver(this);
+  Disconnect(base::Bind(&base::DoNothing));
+}
+
+std::string BluetoothGattConnectionChromeOS::GetDeviceAddress() const {
+  return device_address_;
+}
+
+bool BluetoothGattConnectionChromeOS::IsConnected() {
+  // Lazily determine the activity state of the connection. If already
+  // marked as inactive, then return false. Otherwise, explicitly mark
+  // |connected_| as false if the device is removed or disconnected. We do this,
+  // so that if this method is called during a call to DeviceRemoved or
+  // DeviceChanged somewhere else, it returns the correct status.
+  if (!connected_)
+    return false;
+
+  BluetoothDeviceClient::Properties* properties =
+      DBusThreadManager::Get()->GetBluetoothDeviceClient()->
+          GetProperties(object_path_);
+  if (!properties || !properties->connected.value())
+    connected_ = false;
+
+  return connected_;
+}
+
+void BluetoothGattConnectionChromeOS::Disconnect(
+    const base::Closure& callback) {
+  if (!connected_) {
+    VLOG(1) << "Connection already inactive.";
+    callback.Run();
+    return;
+  }
+
+  // TODO(armansito): There isn't currently a good way to manage the ownership
+  // of a connection between Chrome and bluetoothd plugins/profiles. Until
+  // a proper reference count is kept by bluetoothd, we might unwittingly kill
+  // a connection that is managed by the daemon (e.g. HoG). For now, just return
+  // success to indicate that this BluetoothGattConnection is no longer active,
+  // even though the underlying connection won't actually be disconnected. This
+  // technically doesn't violate the contract put forth by this API.
+  connected_ = false;
+  callback.Run();
+}
+
+void BluetoothGattConnectionChromeOS::DeviceRemoved(
+    const dbus::ObjectPath& object_path) {
+  if (object_path != object_path_)
+    return;
+
+  connected_ = false;
+}
+
+void BluetoothGattConnectionChromeOS::DevicePropertyChanged(
+    const dbus::ObjectPath& object_path,
+    const std::string& property_name) {
+  if (object_path != object_path_)
+    return;
+
+  if (!connected_)
+    return;
+
+  BluetoothDeviceClient::Properties* properties =
+      DBusThreadManager::Get()->GetBluetoothDeviceClient()->
+          GetProperties(object_path_);
+
+  if (!properties) {
+    connected_ = false;
+    return;
+  }
+
+  if (property_name == properties->connected.name() &&
+      !properties->connected.value())
+    connected_ = false;
+}
+
+}  // namespace chromeos