bluetooth: Finish implementing GetState()

Use Adapter's power state for GetState().

Bug: 870192
Change-Id: I4c431fad09e540e8f20b21feb638ae6ba701f637
Reviewed-on: https://chromium-review.googlesource.com/c/1250581
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596532}

services/device/bluetooth/bluetooth_system.cc

@@ -35,8 +35,10 @@ void BluetoothSystem::GetState(GetStateCallback callback) {
     return;
   }
 
-  // TODO(crbug.com/870192): Return the state based on the adapter's state.
-  std::move(callback).Run(State::kPoweredOff);
+  auto* properties =
+      GetBluetoothAdapterClient()->GetProperties(object_paths[0]);
+  std::move(callback).Run(properties->powered.value() ? State::kPoweredOn
+                                                      : State::kPoweredOff);
 }
 
 bluez::BluetoothAdapterClient* BluetoothSystem::GetBluetoothAdapterClient() {

services/device/bluetooth/bluetooth_system_unittest.cc

@@ -19,6 +19,10 @@
 
 namespace device {
 
+constexpr const char kFooObjectPathStr[] = "fake/hci0";
+
+namespace {
+
 // Exposes high-level methods to simulate Bluetooth events e.g. a new adapter
 // was added, adapter power state changed, etc.
 //
@@ -60,14 +64,26 @@ class DEVICE_BLUETOOTH_EXPORT TestBluetoothAdapterClient
   TestBluetoothAdapterClient() = default;
   ~TestBluetoothAdapterClient() override = default;
 
-  // Simulates a new adapter being added to the system.
-  void SimulateAdapterAdded() {
-    static int next_adapter_index = 0;
-    dbus::ObjectPath adapter_object_path(
-        base::StringPrintf("fake/hci%d", next_adapter_index++));
+  // Simulates a new adapter with |object_path_str|. Its properties are empty,
+  // 0, or false.
+  void SimulateAdapterAdded(const std::string& object_path_str) {
+    dbus::ObjectPath object_path(object_path_str);
+
+    ObjectPathToProperties::iterator it;
+    bool was_inserted;
+    std::tie(it, was_inserted) = adapter_object_paths_to_properties_.emplace(
+        object_path,
+        base::BindRepeating(&TestBluetoothAdapterClient::OnPropertyChanged,
+                            base::Unretained(this), object_path));
+    DCHECK(was_inserted);
+  }
 
-    DCHECK(!base::ContainsValue(adapter_object_paths_, adapter_object_path));
-    adapter_object_paths_.push_back(adapter_object_path);
+  // Simulates adapter at |object_path_str| changing its powered state to
+  // |powered|.
+  void SimulateAdapterPowerStateChanged(const std::string& object_path_str,
+                                        bool powered) {
+    GetProperties(dbus::ObjectPath(object_path_str))
+        ->powered.ReplaceValue(powered);
   }
 
   // BluetoothAdapterClient:
@@ -83,13 +99,19 @@ class DEVICE_BLUETOOTH_EXPORT TestBluetoothAdapterClient
   }
 
   std::vector<dbus::ObjectPath> GetAdapters() override {
-    return std::vector<dbus::ObjectPath>(adapter_object_paths_.begin(),
-                                         adapter_object_paths_.end());
+    std::vector<dbus::ObjectPath> object_paths;
+    for (const auto& object_path_to_property :
+         adapter_object_paths_to_properties_) {
+      object_paths.push_back(object_path_to_property.first);
+    }
+    return object_paths;
   }
 
   Properties* GetProperties(const dbus::ObjectPath& object_path) override {
-    NOTIMPLEMENTED();
-    return nullptr;
+    auto it = adapter_object_paths_to_properties_.find(object_path);
+    if (it == adapter_object_paths_to_properties_.end())
+      return nullptr;
+    return &(it->second);
   }
 
   void StartDiscovery(const dbus::ObjectPath& object_path,
@@ -145,11 +167,21 @@ class DEVICE_BLUETOOTH_EXPORT TestBluetoothAdapterClient
   }
 
  private:
-  std::vector<dbus::ObjectPath> adapter_object_paths_;
+  void OnPropertyChanged(const dbus::ObjectPath& object_path,
+                         const std::string& property_name) {
+    for (auto& observer : observers_) {
+      observer.AdapterPropertyChanged(object_path, property_name);
+    }
+  }
+
+  using ObjectPathToProperties = std::map<dbus::ObjectPath, Properties>;
+  ObjectPathToProperties adapter_object_paths_to_properties_;
 
   base::ObserverList<Observer>::Unchecked observers_;
 };
 
+}  // namespace
+
 class BluetoothSystemTest : public DeviceServiceTestBase,
                             public mojom::BluetoothSystemClient {
  public:
@@ -231,9 +263,10 @@ TEST_F(BluetoothSystemTest, GetState_NoAdapter) {
 }
 
 TEST_F(BluetoothSystemTest, GetState_PoweredOffAdapter) {
-  auto system = CreateBluetoothSystem();
+  test_bluetooth_adapter_client_->SimulateAdapterAdded(kFooObjectPathStr);
+  // Added adapters are Off by default.
 
-  test_bluetooth_adapter_client_->SimulateAdapterAdded();
+  auto system = CreateBluetoothSystem();
 
   base::RunLoop run_loop;
   system->GetState(base::BindOnce(&BluetoothSystemTest::StateCallback,
@@ -244,4 +277,20 @@ TEST_F(BluetoothSystemTest, GetState_PoweredOffAdapter) {
   EXPECT_EQ(mojom::BluetoothSystem::State::kPoweredOff, last_state_.value());
 }
 
+TEST_F(BluetoothSystemTest, GetState_PoweredOnAdapter) {
+  test_bluetooth_adapter_client_->SimulateAdapterAdded(kFooObjectPathStr);
+  test_bluetooth_adapter_client_->SimulateAdapterPowerStateChanged(
+      kFooObjectPathStr, true);
+
+  auto system = CreateBluetoothSystem();
+
+  base::RunLoop run_loop;
+  system->GetState(base::BindOnce(&BluetoothSystemTest::StateCallback,
+                                  base::Unretained(this),
+                                  run_loop.QuitClosure()));
+  run_loop.Run();
+
+  EXPECT_EQ(mojom::BluetoothSystem::State::kPoweredOn, last_state_.value());
+}
+
 }  // namespace device