[Background Sync] Use Mojo IPC to fire background sync events

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 "base/bind.h"
+#include "base/location.h"
+#include "base/memory/weak_ptr.h"
+#include "content/child/worker_task_runner.h"
+#include "content/renderer/service_worker/embedded_worker_context_client.h"
+#include "content/renderer/service_worker/service_worker_script_context.h"
+
+namespace content {
+
+// static
+void BackgroundSyncClientImpl::Create(
+    const scoped_refptr<base::SingleThreadTaskRunner>& main_thread_task_runner,
+    mojo::InterfaceRequest<BackgroundSyncServiceClient> request) {
+  new BackgroundSyncClientImpl(main_thread_task_runner, request.Pass());
+}
+
+BackgroundSyncClientImpl::~BackgroundSyncClientImpl() {
+}
+
+BackgroundSyncClientImpl::BackgroundSyncClientImpl(
+    const scoped_refptr<base::SingleThreadTaskRunner>& main_thread_task_runner,
+    mojo::InterfaceRequest<BackgroundSyncServiceClient> request)
+    : binding_(this, request.Pass()),
+      main_thread_task_runner_(main_thread_task_runner),
+      weak_ptr_factory_(this) {
+}
+
+void BackgroundSyncClientImpl::Sync(content::SyncRegistrationPtr registration,
+                                    int thread_id,
+                                    const SyncCallback& callback) {
+  WorkerTaskRunner* worker_task_runner = WorkerTaskRunner::Instance();
+  if (!worker_task_runner) {
+    callback.Run(BACKGROUND_SYNC_EVENT_STATUS_ABORT);
+    return;
+  }
+  // TODO(iclelland): If the worker is dead, GetTaskRunnerFor(thread_id) will
+  // still return a task runner. Detect that state and call callback with an
+  // abort status.
+  worker_task_runner->GetTaskRunnerFor(thread_id)->PostTask(
+      FROM_HERE, base::Bind(&BackgroundSyncClientImpl::DispatchSyncForWorker,
+                            base::Unretained(this),
+                            base::Passed(registration.Pass()), callback));
+}
+
+void BackgroundSyncClientImpl::DispatchSyncForWorker(
+    content::SyncRegistrationPtr options,
+    const SyncCallback& callback) {
+  EmbeddedWorkerContextClient* client =
+      EmbeddedWorkerContextClient::ThreadSpecificInstance();
+  if (!client) {
+    callback.Run(BACKGROUND_SYNC_EVENT_STATUS_ABORT);
+    return;
+  }
+  client->script_context()->DispatchSyncEvent(
+      base::Bind(&BackgroundSyncClientImpl::OnSyncComplete,
+                 weak_ptr_factory_.GetWeakPtr(), callback));
+}
+
+void BackgroundSyncClientImpl::OnSyncComplete(
+    const SyncCallback& callback,
+    BackgroundSyncEventStatus status) {
+  if (!main_thread_task_runner_->RunsTasksOnCurrentThread()) {
+    // Re-run on main thread
+    main_thread_task_runner_->PostTask(
+        FROM_HERE, base::Bind(&BackgroundSyncClientImpl::OnSyncComplete,
+                              base::Unretained(this), callback, status));
+    return;
+  }
+  callback.Run(status);
+}
+
+}  // namespace content