BLE GATT service implementation in Chrome for Windows 8 and later

device/bluetooth/bluetooth_remote_gatt_descriptor_win.cc

+// Copyright 2015 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_remote_gatt_descriptor_win.h"
+
+#include "base/bind.h"
+
+namespace device {
+
+BluetoothRemoteGattDescriptorWin::BluetoothRemoteGattDescriptorWin(
+    BluetoothAdapterWin* adapter,
+    base::FilePath service_path,
+    BluetoothRemoteGattCharacteristicWin* parent_characteristic,
+    BTH_LE_GATT_DESCRIPTOR* descriptor_info,
+    scoped_refptr<base::SequencedTaskRunner>& ui_task_runner)
+    : adapter_(adapter),
+      service_path_(service_path),
+      parent_characteristic_(parent_characteristic),
+      descriptor_info_(descriptor_info),
+      ui_task_runner_(ui_task_runner),
+      descriptor_initialized_(false),
+      weak_ptr_factory_(this) {
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+  descriptor_value_.clear();
+  read_remote_descriptor_value_callbacks_.clear();
+  write_remote_descriptor_value_callbacks_.clear();
+
+  task_manager_ = adapter_->GetWinBluetoothTaskManager();
+  DCHECK(parent_characteristic_);
+  DCHECK(descriptor_info_.get());
+  DCHECK(adapter_);
+  DCHECK(task_manager_);
+
+  descriptor_uuid_ = task_manager_->BluetoothLowEnergyUuidToBluetoothUuid(
+      descriptor_info_.get()->DescriptorUuid);
+  // TODO(gogerald): Could not find permission information from
+  // BTH_LE_GATT_DESCRIPTOR. Give read and write permission by default. Update
+  // it according to future read/write feedback. Use system information when it
+  // is available.
+  permissions_ = BluetoothGattCharacteristic::PERMISSION_READ |
+                 BluetoothGattCharacteristic::PERMISSION_WRITE;
+  Update();
+}
+
+BluetoothRemoteGattDescriptorWin::~BluetoothRemoteGattDescriptorWin() {
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+  adapter_->NotifyGattDescriptorRemoved(this);
+}
+
+std::string BluetoothRemoteGattDescriptorWin::GetIdentifier() const {
+  return parent_characteristic_->GetIdentifier() + "_" +
+         descriptor_uuid_.value();
+}
+
+BluetoothUUID BluetoothRemoteGattDescriptorWin::GetUUID() const {
+  return descriptor_uuid_;
+}
+
+bool BluetoothRemoteGattDescriptorWin::IsLocal() const {
+  return false;
+}
+
+std::vector<uint8_t>& BluetoothRemoteGattDescriptorWin::GetValue() const {
+  return const_cast<std::vector<uint8_t>&>(descriptor_value_);
+}
+
+BluetoothGattCharacteristic*
+BluetoothRemoteGattDescriptorWin::GetCharacteristic() const {
+  return parent_characteristic_;
+}
+
+BluetoothGattCharacteristic::Permissions
+BluetoothRemoteGattDescriptorWin::GetPermissions() const {
+  return permissions_;
+}
+
+BluetoothGattService::GattErrorCode
+BluetoothRemoteGattDescriptorWin::SystemErrorToGattErrorCode(HRESULT hr) {
+  if (hr == E_BLUETOOTH_ATT_READ_NOT_PERMITTED ||
+      hr == E_BLUETOOTH_ATT_WRITE_NOT_PERMITTED) {
+    return BluetoothGattService::GATT_ERROR_NOT_PERMITTED;
+  }
+  return BluetoothGattService::GATT_ERROR_FAILED;
+}
+
+void BluetoothRemoteGattDescriptorWin::ReadRemoteDescriptorValueCallback(
+    BTH_LE_GATT_DESCRIPTOR_VALUE* value,
+    HRESULT hr) {
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+  if (FAILED(hr)) {
+    LOG(ERROR) << "Failed at reading descriptor value";
+    BluetoothGattService::GattErrorCode error = SystemErrorToGattErrorCode(hr);
+    if (error == BluetoothGattService::GATT_ERROR_NOT_PERMITTED) {
+      permissions_ =
+          permissions_ & ~BluetoothGattCharacteristic::PERMISSION_READ;
+    }
+    for (const auto callback : read_remote_descriptor_value_callbacks_)
+      callback.second.Run(error);
+  } else {
+    descriptor_value_.clear();
+    for (ULONG i = 0; i < value->DataSize; i++)
+      descriptor_value_.push_back(value->Data[i]);
+    for (const auto callback : read_remote_descriptor_value_callbacks_)
+      callback.first.Run(descriptor_value_);
+  }
+
+  if (!descriptor_initialized_) {
+    parent_characteristic_->NotifyGattDescriptorAdded(this);
+    descriptor_initialized_ = true;
+  }
+  read_remote_descriptor_value_callbacks_.clear();
+}
+
+void BluetoothRemoteGattDescriptorWin::ReadRemoteDescriptor(
+    const ValueCallback& callback,
+    const ErrorCallback& error_callback) {
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+  read_remote_descriptor_value_callbacks_.push_back(
+      std::make_pair(callback, error_callback));
+  task_manager_->PostReadDescriptorValue(
+      service_path_, descriptor_info_.get(),
+      base::Bind(
+          &BluetoothRemoteGattDescriptorWin::ReadRemoteDescriptorValueCallback,
+          weak_ptr_factory_.GetWeakPtr()));
+}
+
+void BluetoothRemoteGattDescriptorWin::WriteRemoteDescriptorValueCallback(
+    HRESULT hr) {
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+  if (FAILED(hr)) {
+    BluetoothGattService::GattErrorCode error = SystemErrorToGattErrorCode(hr);
+    if (error == BluetoothGattService::GATT_ERROR_NOT_PERMITTED) {
+      permissions_ =
+          permissions_ & ~BluetoothGattCharacteristic::PERMISSION_WRITE;
+    }
+    for (const auto callback : write_remote_descriptor_value_callbacks_)
+      callback.second.Run(error);
+  } else {
+    for (auto callback : write_remote_descriptor_value_callbacks_)
+      callback.first.Run();
+  }
+
+  write_remote_descriptor_value_callbacks_.clear();
+}
+
+void BluetoothRemoteGattDescriptorWin::WriteRemoteDescriptor(
+    const std::vector<uint8_t>& new_value,
+    const base::Closure& callback,
+    const ErrorCallback& error_callback) {
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+  write_remote_descriptor_value_callbacks_.push_back(
+      std::make_pair(callback, error_callback));
+  task_manager_->PostWriteDescriptorValue(
+      service_path_, descriptor_info_.get(), new_value,
+      base::Bind(
+          &BluetoothRemoteGattDescriptorWin::WriteRemoteDescriptorValueCallback,
+          weak_ptr_factory_.GetWeakPtr()));
+}
+
+void BluetoothRemoteGattDescriptorWin::Update() {
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+  task_manager_->PostReadDescriptorValue(
+      service_path_, descriptor_info_.get(),
+      base::Bind(
+          &BluetoothRemoteGattDescriptorWin::ReadRemoteDescriptorValueCallback,
+          weak_ptr_factory_.GetWeakPtr()));
+}
+
+}  // namespace device.