Implement BluetoothRemoteGattCharacteristicWin::StartNotifySession and related unit tests

device/bluetooth/bluetooth_remote_gatt_characteristic_win.cc

 // 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.
 
 #include "device/bluetooth/bluetooth_remote_gatt_characteristic_win.h"
 
 #include "base/bind.h"
 #include "device/bluetooth/bluetooth_adapter_win.h"
+#include "device/bluetooth/bluetooth_gatt_notify_session_win.h"
 #include "device/bluetooth/bluetooth_remote_gatt_descriptor_win.h"
 #include "device/bluetooth/bluetooth_remote_gatt_service_win.h"
 #include "device/bluetooth/bluetooth_task_manager_win.h"
 
 namespace device {
 
 BluetoothRemoteGattCharacteristicWin::BluetoothRemoteGattCharacteristicWin(
     BluetoothRemoteGattServiceWin* parent_service,
     BTH_LE_GATT_CHARACTERISTIC* characteristic_info,
     scoped_refptr<base::SequencedTaskRunner>& ui_task_runner)
     : parent_service_(parent_service),
       characteristic_info_(characteristic_info),
       ui_task_runner_(ui_task_runner),
       characteristic_added_notified_(false),
       characteristic_value_read_or_write_in_progress_(false),
+      gatt_event_registeration_in_progress_(false),
+      gatt_event_handle_(nullptr),
       weak_ptr_factory_(this) {
   DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
   DCHECK(parent_service_);
   DCHECK(characteristic_info_);
 
   task_manager_ =
       parent_service_->GetWinAdapter()->GetWinBluetoothTaskManager();
   DCHECK(task_manager_);
   characteristic_uuid_ =
       BluetoothTaskManagerWin::BluetoothLowEnergyUuidToBluetoothUuid(
           characteristic_info_->CharacteristicUuid);
   characteristic_identifier_ =
       parent_service_->GetIdentifier() + "_" +
       std::to_string(characteristic_info_->AttributeHandle);
   Update();
 }
 
 BluetoothRemoteGattCharacteristicWin::~BluetoothRemoteGattCharacteristicWin() {
   DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 
+  if (gatt_event_handle_ != nullptr) {
+    task_manager_->PostUnregisterGattCharacteristicValueChangedEvent(
+        gatt_event_handle_);
+    gatt_event_handle_ = nullptr;
+  }
   parent_service_->GetWinAdapter()->NotifyGattCharacteristicRemoved(this);
 }
 
 std::string BluetoothRemoteGattCharacteristicWin::GetIdentifier() const {
   return characteristic_identifier_;
 }
 
 BluetoothUUID BluetoothRemoteGattCharacteristicWin::GetUUID() const {
   return characteristic_uuid_;
 }
@@ skipping 44 matching lines @@
 
   if (characteristic_info_->IsReadable)
     permissions = permissions | PERMISSION_READ;
   if (characteristic_info_->IsWritable)
     permissions = permissions | PERMISSION_WRITE;
 
   return permissions;
 }
 
 bool BluetoothRemoteGattCharacteristicWin::IsNotifying() const {
-  NOTIMPLEMENTED();
-  return false;
+  return gatt_event_handle_ != nullptr;
 }
 
 std::vector<BluetoothGattDescriptor*>
 BluetoothRemoteGattCharacteristicWin::GetDescriptors() const {
   std::vector<BluetoothGattDescriptor*> descriptors;
   for (const auto& descriptor : included_descriptors_)
     descriptors.push_back(descriptor.second.get());
   return descriptors;
 }
 
@@ skipping 13 matching lines @@
 
 bool BluetoothRemoteGattCharacteristicWin::UpdateValue(
     const std::vector<uint8_t>& value) {
   NOTIMPLEMENTED();
   return false;
 }
 
 void BluetoothRemoteGattCharacteristicWin::StartNotifySession(
     const NotifySessionCallback& callback,
     const ErrorCallback& error_callback) {
-  NOTIMPLEMENTED();
-  error_callback.Run(BluetoothGattService::GATT_ERROR_NOT_SUPPORTED);
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+
+  if (IsNotifying()) {
+    scoped_ptr<BluetoothGattNotifySessionWin> notify_session(
+        new BluetoothGattNotifySessionWin(weak_ptr_factory_.GetWeakPtr()));
+    ui_task_runner_->PostTask(
+        FROM_HERE,
+        base::Bind(callback, base::Passed(std::move(notify_session))));
+    return;
+  }
+
+  if (gatt_event_registeration_in_progress_) {
+    start_notify_session_callbacks_.push_back(
+        std::make_pair(callback, error_callback));
+    return;
+  }
+
+  if (!characteristic_info_->IsNotifiable &&
+      !characteristic_info_->IsIndicatable) {
+    ui_task_runner_->PostTask(
+        FROM_HERE, base::Bind(error_callback,
+                              BluetoothGattService::GATT_ERROR_NOT_SUPPORTED));
+    return;
+  }
+
+  // TODO(crbug.com/594697): Check the existence of client characteristic
+  // configuration descriptor.
+
+  start_notify_session_callbacks_.push_back(
+      std::make_pair(callback, error_callback));
+  task_manager_->PostRegisterGattCharacteristicValueChangedEvent(
+      parent_service_->GetServicePath(), characteristic_info_.get(),
+      base::Bind(
+          &BluetoothRemoteGattCharacteristicWin::GattEventRegistrationCallback,
+          weak_ptr_factory_.GetWeakPtr()),
+      base::Bind(&BluetoothRemoteGattCharacteristicWin::
+                     OnGattCharacteristicValueChanged,
+                 weak_ptr_factory_.GetWeakPtr()));
+  gatt_event_registeration_in_progress_ = true;
 }
 
 void BluetoothRemoteGattCharacteristicWin::ReadRemoteCharacteristic(
     const ValueCallback& callback,
     const ErrorCallback& error_callback) {
   DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
 
   if (!characteristic_info_.get()->IsReadable) {
     error_callback.Run(BluetoothGattService::GATT_ERROR_NOT_PERMITTED);
     return;
@@ skipping 162 matching lines @@
   if (FAILED(hr)) {
     callbacks.second.Run(HRESULTToGattErrorCode(hr));
   } else {
     callbacks.first.Run();
   }
   characteristic_value_read_or_write_in_progress_ = false;
 }
 
 BluetoothGattService::GattErrorCode
 BluetoothRemoteGattCharacteristicWin::HRESULTToGattErrorCode(HRESULT hr) {
+  if (HRESULT_FROM_WIN32(ERROR_INVALID_USER_BUFFER) == hr)
+    return BluetoothGattService::GATT_ERROR_INVALID_LENGTH;
+
   switch (hr) {
     case E_BLUETOOTH_ATT_READ_NOT_PERMITTED:
     case E_BLUETOOTH_ATT_WRITE_NOT_PERMITTED:
       return BluetoothGattService::GATT_ERROR_NOT_PERMITTED;
     case E_BLUETOOTH_ATT_UNKNOWN_ERROR:
       return BluetoothGattService::GATT_ERROR_UNKNOWN;
-    case ERROR_INVALID_USER_BUFFER:
     case E_BLUETOOTH_ATT_INVALID_ATTRIBUTE_VALUE_LENGTH:
       return BluetoothGattService::GATT_ERROR_INVALID_LENGTH;
+    case E_BLUETOOTH_ATT_REQUEST_NOT_SUPPORTED:
+      return BluetoothGattService::GATT_ERROR_NOT_SUPPORTED;
     default:
       return BluetoothGattService::GATT_ERROR_FAILED;
   }
 }
 
+void BluetoothRemoteGattCharacteristicWin::OnGattCharacteristicValueChanged(
+    scoped_ptr<std::vector<uint8_t>> new_value) {
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+
+  // Ignore notification if no active notify session exist. This could happen
+  // since PostUnregisterGattCharacteristicValueChangedEvent is asynchronous.
+  if (!IsNotifying())

[ortuno, 2016/03/15 02:55:31]

I don't think you need this. The only time gatt_event_handle_ is false (and
IsNotifying() is false) is after destruction. Since you passed a weak_ptr to the
callback then we would never hit that case.

[gogerald1, 2016/03/15 18:28:22]

Done. Residual of removing stop notify session.

+    return;
+  characteristic_value_.assign(new_value->begin(), new_value->end());
+  parent_service_->GetWinAdapter()->NotifyGattCharacteristicValueChanged(
+      this, characteristic_value_);
+}
+
+void BluetoothRemoteGattCharacteristicWin::GattEventRegistrationCallback(
+    BLUETOOTH_GATT_EVENT_HANDLE event_handle,
+    HRESULT hr) {
+  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
+
+  gatt_event_registeration_in_progress_ = false;
+  std::vector<std::pair<NotifySessionCallback, ErrorCallback>> callbacks;
+  callbacks.swap(start_notify_session_callbacks_);
+  if (SUCCEEDED(hr)) {
+    gatt_event_handle_ = event_handle;
+    for (const auto& callback : callbacks) {
+      callback.first.Run(make_scoped_ptr(
+          new BluetoothGattNotifySessionWin(weak_ptr_factory_.GetWeakPtr())));
+    }
+  } else {
+    for (const auto& callback : callbacks)
+      callback.second.Run(HRESULTToGattErrorCode(hr));
+  }
+}
+
 }  // namespace device.