BackgroundSyncManager tracks client registrations

content/renderer/background_sync/background_sync_client_impl.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 "content/renderer/background_sync/background_sync_client_impl.h"
 
+#include "content/child/background_sync/background_sync_provider_thread_proxy.h"
 #include "content/child/background_sync/background_sync_type_converters.h"
 #include "content/renderer/service_worker/service_worker_context_client.h"
+#include "third_party/WebKit/public/platform/Platform.h"
+#include "third_party/WebKit/public/platform/WebThread.h"
+#include "third_party/WebKit/public/platform/modules/background_sync/WebSyncProvider.h"
 #include "third_party/WebKit/public/platform/modules/background_sync/WebSyncRegistration.h"
 
 namespace content {
 
 // static
 void BackgroundSyncClientImpl::Create(
+    int64 service_worker_registration_id,
     mojo::InterfaceRequest<BackgroundSyncServiceClient> request) {
-  new BackgroundSyncClientImpl(request.Pass());
+  new BackgroundSyncClientImpl(service_worker_registration_id, request.Pass());
 }
 
 BackgroundSyncClientImpl::~BackgroundSyncClientImpl() {}
 
 BackgroundSyncClientImpl::BackgroundSyncClientImpl(
+    int64 service_worker_registration_id,
     mojo::InterfaceRequest<BackgroundSyncServiceClient> request)
-    : binding_(this, request.Pass()) {}
+    : service_worker_registration_id_(service_worker_registration_id),
+      binding_(this, request.Pass()) {}
 
-void BackgroundSyncClientImpl::Sync(content::SyncRegistrationPtr registration,
+void BackgroundSyncClientImpl::Sync(int handle_id,
                                     const SyncCallback& callback) {
+  DCHECK(!blink::Platform::current()->mainThread()->isCurrentThread());
+  // Get a registration for the given handle_id from the provider. This way
+  // the provider knows about the handle and can delete it once Blink releases
+  // it.
+  // TODO(jkarlin): Change the WebSyncPlatform to support
+  // DuplicateRegistrationHandle and then this cast can go.
+  BackgroundSyncProviderThreadProxy* provider =
+      static_cast<BackgroundSyncProviderThreadProxy*>(
+          blink::Platform::current()->backgroundSyncProvider());
+  DCHECK(provider);
+
+  // TODO(jkarlin): Find a way to claim the handle safely without requiring a
+  // round-trip IPC.
+  provider->DuplicateRegistrationHandle(
+      handle_id, base::Bind(&BackgroundSyncClientImpl::SyncDidGetRegistration,
+                            base::Unretained(this), callback));
+}
+
+void BackgroundSyncClientImpl::SyncDidGetRegistration(
+    const SyncCallback& callback,
+    BackgroundSyncError error,
+    const SyncRegistrationPtr& registration) {
+  if (error != BACKGROUND_SYNC_ERROR_NONE) {
+    callback.Run(SERVICE_WORKER_EVENT_STATUS_ABORTED);
+    return;
+  }
+
   ServiceWorkerContextClient* client =
       ServiceWorkerContextClient::ThreadSpecificInstance();
   if (!client) {
     callback.Run(SERVICE_WORKER_EVENT_STATUS_ABORTED);
     return;
   }
-  scoped_ptr<blink::WebSyncRegistration> reg =
+
+  scoped_ptr<blink::WebSyncRegistration> web_registration =
       mojo::ConvertTo<scoped_ptr<blink::WebSyncRegistration>>(registration);
-  client->DispatchSyncEvent(*reg, callback);
+
+  client->DispatchSyncEvent(*web_registration, callback);
 }
 
 }  // namespace content