bluetooth: Return specific message if Bluetooth Adapter is off

content/browser/bluetooth/bluetooth_dispatcher_host.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.
 
 // NETWORK_ERROR Note:
 // When a device can't be found in the BluetoothAdapter, that generally
 // indicates that it's gone out of range. We reject with a NetworkError in that
 // case.
 // https://webbluetoothchrome.github.io/web-bluetooth/#dom-bluetoothdevice-connectgatt
 
@@ skipping 31 matching lines @@
   MAX_ERROR,
 };
 
 enum class UMARequestDeviceOutcome {
   SUCCESS = 0,
   NO_BLUETOOTH_ADAPTER = 1,
   NO_RENDER_FRAME = 2,
   DISCOVERY_START_FAILED = 3,
   DISCOVERY_STOP_FAILED = 4,
   NO_MATCHING_DEVICES_FOUND = 5,
+  BLUETOOTH_ADAPTER_NOT_PRESENT = 6,
+  BLUETOOTH_ADAPTER_OFF = 7,
   // NOTE: Add new requestDevice() outcomes immediately above this line. Make
   // sure to update the enum list in
   // tools/metrics/histogram/histograms.xml accordingly.
   COUNT
 };
 
 void RecordRequestDeviceOutcome(UMARequestDeviceOutcome outcome) {
   UMA_HISTOGRAM_ENUMERATION("Bluetooth.RequestDevice.Outcome",
                             static_cast<int>(outcome),
                             static_cast<int>(UMARequestDeviceOutcome::COUNT));
@@ skipping 227 matching lines @@
              .insert(std::make_pair(
                  std::make_pair(thread_id, request_id),
                  RequestDeviceSession(filters, optional_services)))
              .second) {
       LOG(ERROR) << "2 requestDevice() calls with the same thread_id ("
                  << thread_id << ") and request_id (" << request_id
                  << ") shouldn't arrive at the same BluetoothDispatcherHost.";
       bad_message::ReceivedBadMessage(
           this, bad_message::BDH_DUPLICATE_REQUEST_DEVICE_ID);
     }
+    if (!adapter_->IsPresent()) {
+      VLOG(1) << "Bluetooth Adapter not present. Can't serve requestDevice.";
+      RecordRequestDeviceOutcome(
+          UMARequestDeviceOutcome::BLUETOOTH_ADAPTER_NOT_PRESENT);
+      Send(new BluetoothMsg_RequestDeviceError(
+          thread_id, request_id, WebBluetoothError::NoBluetoothAdapter));
+      request_device_sessions_.erase(std::make_pair(thread_id, request_id));
+      return;
+    }
+    // TODO(jyasskin): Once the dialog is available, the dialog should check for
+    // the status of the adapter, i.e. check IsPowered() and
+    // BluetoothAdapter::Observer::PoweredChanged, and inform the user. But
+    // until the dialog is available we log/histogram the status and return
+    // with a message.
+    // https://crbug.com/517237
+    if (!adapter_->IsPowered()) {
+      VLOG(1) << "Bluetooth Adapter is not powered. Can't serve requestDevice.";
+      RecordRequestDeviceOutcome(
+          UMARequestDeviceOutcome::BLUETOOTH_ADAPTER_OFF);
+      Send(new BluetoothMsg_RequestDeviceError(
+          thread_id, request_id, WebBluetoothError::BluetoothAdapterOff));
+      request_device_sessions_.erase(std::make_pair(thread_id, request_id));
+      return;
+    }
     adapter_->StartDiscoverySessionWithFilter(
         ComputeScanFilter(filters),
         base::Bind(&BluetoothDispatcherHost::OnDiscoverySessionStarted,
                    weak_ptr_factory_.GetWeakPtr(), thread_id, request_id),
         base::Bind(&BluetoothDispatcherHost::OnDiscoverySessionStartedError,
                    weak_ptr_factory_.GetWeakPtr(), thread_id, request_id));
   } else {
     DLOG(WARNING) << "No BluetoothAdapter. Can't serve requestDevice.";
     RecordRequestDeviceOutcome(UMARequestDeviceOutcome::NO_BLUETOOTH_ADAPTER);
     Send(new BluetoothMsg_RequestDeviceError(
@@ skipping 394 matching lines @@
 
 void BluetoothDispatcherHost::OnWriteValueFailed(
     int thread_id,
     int request_id,
     device::BluetoothGattService::GattErrorCode error_code) {
   Send(new BluetoothMsg_WriteCharacteristicValueError(
       thread_id, request_id, TranslateGATTError(error_code)));
 }
 
 }  // namespace content