Remove RemoteServerDisconnect() from web_bluetooth.mojom

third_party/WebKit/Source/modules/bluetooth/BluetoothRemoteGATTServer.cpp

 // 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 "modules/bluetooth/BluetoothRemoteGATTServer.h"
 
 #include "bindings/core/v8/CallbackPromiseAdapter.h"
 #include "bindings/core/v8/ScriptPromise.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/events/Event.h"
 #include "modules/bluetooth/Bluetooth.h"
 #include "modules/bluetooth/BluetoothDevice.h"
 #include "modules/bluetooth/BluetoothError.h"
 #include "modules/bluetooth/BluetoothRemoteGATTService.h"
 #include "modules/bluetooth/BluetoothUUID.h"
-#include "mojo/public/cpp/bindings/associated_interface_ptr.h"
 #include <utility>
 
 namespace blink {
 
 BluetoothRemoteGATTServer::BluetoothRemoteGATTServer(ExecutionContext* context,
                                                      BluetoothDevice* device)
-    : ContextLifecycleObserver(context), m_device(device), m_connected(false) {}
+    : ContextLifecycleObserver(context),
+      m_clientBinding(this),
+      m_device(device),
+      m_connected(false) {}
 
 BluetoothRemoteGATTServer* BluetoothRemoteGATTServer::Create(
     ExecutionContext* context,
     BluetoothDevice* device) {
   return new BluetoothRemoteGATTServer(context, device);
 }
 
 void BluetoothRemoteGATTServer::contextDestroyed(ExecutionContext*) {
   Dispose();
 }
 
 void BluetoothRemoteGATTServer::GATTServerDisconnected() {
-  DispatchDisconnected();
+  if (!m_connected) {
+    return;
+  }
+  DCHECK(m_clientBinding.is_bound());
+  CleanupDisconnectedDevice(true /* dispatchEvent */);
 }
 
 void BluetoothRemoteGATTServer::AddToActiveAlgorithms(
     ScriptPromiseResolver* resolver) {
   auto result = m_activeAlgorithms.insert(resolver);
   CHECK(result.isNewEntry);
 }
 
 bool BluetoothRemoteGATTServer::RemoveFromActiveAlgorithms(
     ScriptPromiseResolver* resolver) {
   if (!m_activeAlgorithms.contains(resolver)) {
     return false;
   }
   m_activeAlgorithms.erase(resolver);
   return true;
 }
 
-void BluetoothRemoteGATTServer::DisconnectIfConnected() {
-  if (m_connected) {
-    SetConnected(false);
-    ClearActiveAlgorithms();
-    mojom::blink::WebBluetoothService* service =
-        m_device->bluetooth()->Service();
-    service->RemoteServerDisconnect(m_device->id());
+void BluetoothRemoteGATTServer::CleanupDisconnectedDevice(bool dispatchEvent) {
+  // This implements the specification "clean up the disconnected device"
+  // algorithm:
+  // https://webbluetoothcg.github.io/web-bluetooth/#clean-up-the-disconnected-device
+  DCHECK(m_connected);
+  SetConnected(false);
+  ClearActiveAlgorithms();
+  m_device->ClearAttributeInstanceMap();
+  // Below this line there are steps in the above specification which we are
+  // not explicitly handling here: clearing the representedService,
+  // representedCharacteristic and representedDescriptors is done by
+  // ClearAttributeInstanceMap(). The notification context is implemented in
+  // the browser so it cleans up itself.
+  if (dispatchEvent) {
+    m_device->dispatchEvent(
+        Event::createBubble(EventTypeNames::gattserverdisconnected));
   }
 }
 
-void BluetoothRemoteGATTServer::CleanupDisconnectedDeviceAndFireEvent() {
-  DCHECK(m_connected);
-  SetConnected(false);
-  ClearActiveAlgorithms();
-  m_device->ClearAttributeInstanceMapAndFireEvent();
-}
-
-void BluetoothRemoteGATTServer::DispatchDisconnected() {
+void BluetoothRemoteGATTServer::HandleClientConnectionError() {
   if (!m_connected) {
     return;
   }
-  CleanupDisconnectedDeviceAndFireEvent();
+  CleanupDisconnectedDevice(true /* dispatchEvent */);
 }
 
 void BluetoothRemoteGATTServer::Dispose() {
-  DisconnectIfConnected();
-  // The pipe to this object must be closed when is marked unreachable to
-  // prevent messages from being dispatched before lazy sweeping.
-  m_clientBindings.CloseAllBindings();
+  if (!m_connected) {
+    return;
+  }
+  // The object is being garbage collected or the context is being destroyed,
+  // so no need to dispatch a gattserverdisconnected event.
+  CleanupDisconnectedDevice(false /* dispatchEvent */);
+  DCHECK(m_clientBinding.is_bound());
+  m_clientBinding.Close();
 }
 
 DEFINE_TRACE(BluetoothRemoteGATTServer) {
   visitor->trace(m_activeAlgorithms);
   visitor->trace(m_device);
   ContextLifecycleObserver::trace(visitor);
 }
 
 void BluetoothRemoteGATTServer::ConnectCallback(
     ScriptPromiseResolver* resolver,
     mojom::blink::WebBluetoothResult result) {
   if (!resolver->getExecutionContext() ||
       resolver->getExecutionContext()->isContextDestroyed())
     return;
 
   if (result == mojom::blink::WebBluetoothResult::SUCCESS) {
     SetConnected(true);
     resolver->resolve(this);
   } else {
     resolver->reject(BluetoothError::CreateDOMException(result));
   }
 }
 
 ScriptPromise BluetoothRemoteGATTServer::connect(ScriptState* scriptState) {
   ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
   ScriptPromise promise = resolver->promise();
 
-  mojom::blink::WebBluetoothService* service = m_device->bluetooth()->Service();
-  mojom::blink::WebBluetoothServerClientAssociatedPtrInfo ptrInfo;
-  auto request = mojo::MakeRequest(&ptrInfo);
-  m_clientBindings.AddBinding(this, std::move(request));
+  if (m_connected) {
+    resolver->resolve(this);
+  } else {
+    mojom::blink::WebBluetoothService* service =
+        m_device->bluetooth()->Service();
+    mojom::blink::WebBluetoothServerClientAssociatedPtrInfo ptrInfo;
+    m_clientBinding.Bind(&ptrInfo);
+    m_clientBinding.set_connection_error_handler(convertToBaseCallback(
+        WTF::bind(&BluetoothRemoteGATTServer::HandleClientConnectionError,
+                  wrapWeakPersistent(this))));
 
-  service->RemoteServerConnect(
-      m_device->id(), std::move(ptrInfo),
-      convertToBaseCallback(
-          WTF::bind(&BluetoothRemoteGATTServer::ConnectCallback,
-                    wrapPersistent(this), wrapPersistent(resolver))));
+    service->RemoteServerConnect(
+        m_device->id(), std::move(ptrInfo),
+        convertToBaseCallback(
+            WTF::bind(&BluetoothRemoteGATTServer::ConnectCallback,
+                      wrapPersistent(this), wrapPersistent(resolver))));
+  }
 
   return promise;
 }
 
 void BluetoothRemoteGATTServer::disconnect(ScriptState* scriptState) {
-  if (!m_connected)
+  // ClearActiveAlgorithms() implements the specification
+  // "1. Clear this.[[activeAlgorithms]] to abort any active connect() calls."
+  // at:
+  // https://webbluetoothcg.github.io/web-bluetooth/#dom-bluetoothremotegattserver-disconnect
+  // connect() calls will add a promise to this active algorithms map. When
+  // connect's callback is run we check that the promise is still in this
+  // map and if not we reject the promise. During this, |m_connected| stays
+  // false so if we want to actually cancel the connection we need to do so
+  // before the |m_connected| check.
+  ClearActiveAlgorithms();
+  if (!m_connected) {
     return;
-  CleanupDisconnectedDeviceAndFireEvent();
-  m_clientBindings.CloseAllBindings();
-  mojom::blink::WebBluetoothService* service = m_device->bluetooth()->Service();
-  service->RemoteServerDisconnect(m_device->id());
+  }
+  CleanupDisconnectedDevice(true /* dispatchEvent */);
+  DCHECK(m_clientBinding.is_bound());
+  // Implicitly signals disconnect via the connection_error_handler.
+  m_clientBinding.Close();
 }
 
 // Callback that allows us to resolve the promise with a single service or
 // with a vector owning the services.
 void BluetoothRemoteGATTServer::GetPrimaryServicesCallback(
     const String& requestedServiceUUID,
     mojom::blink::WebBluetoothGATTQueryQuantity quantity,
     ScriptPromiseResolver* resolver,
     mojom::blink::WebBluetoothResult result,
     Optional<Vector<mojom::blink::WebBluetoothRemoteGATTServicePtr>> services) {
@@ skipping 90 matching lines @@
   service->RemoteServerGetPrimaryServices(
       m_device->id(), quantity, servicesUUID,
       convertToBaseCallback(
           WTF::bind(&BluetoothRemoteGATTServer::GetPrimaryServicesCallback,
                     wrapPersistent(this), servicesUUID, quantity,
                     wrapPersistent(resolver))));
   return promise;
 }
 
 }  // namespace blink