Dispatch push event to worker from PushServiceImpl#OnMessage.

content/browser/push_messaging_router_impl.cc

+// Copyright 2014 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/browser/push_messaging_router_impl.h"
+
+#include "base/bind.h"
+#include "content/browser/service_worker/service_worker_context_wrapper.h"
+#include "content/browser/service_worker/service_worker_registration.h"
+#include "content/browser/service_worker/service_worker_storage.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/push_messaging_application_id.h"
+#include "content/public/browser/storage_partition.h"
+
+namespace content {
+
+// static
+scoped_ptr<PushMessagingRouter> PushMessagingRouter::Create(
+    BrowserContext* browser_context) {
+  return scoped_ptr<PushMessagingRouter>(
+      new PushMessagingRouterImpl(browser_context));
+}
+
+PushMessagingRouterImpl::PushMessagingRouterImpl(

[johnme, 2014/07/23 14:25:23]

Nit: Would it make sense for the constructor to
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); ?

[Michael van Ouwerkerk, 2014/07/23 16:57:51]

I think it's not necessary for this class, as it's a simple constructor.

+    BrowserContext* browser_context)
+    : browser_context_(browser_context), weak_factory_(this) {
+}
+
+PushMessagingRouterImpl::~PushMessagingRouterImpl() {
+}
+
+void PushMessagingRouterImpl::SendMessage(
+    const PushMessagingApplicationId& application_id,
+    const std::string& data,
+    const SendMessageCallback& send_message_callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  StoragePartition* partition = BrowserContext::GetStoragePartitionForSite(
+      browser_context_, application_id.origin);
+  scoped_refptr<ServiceWorkerContextWrapper> service_worker_context =
+      static_cast<ServiceWorkerContextWrapper*>(
+          partition->GetServiceWorkerContext());
+  BrowserThread::PostTask(
+      BrowserThread::IO,
+      FROM_HERE,
+      base::Bind(&PushMessagingRouterImpl::FindServiceWorkerRegistration,
+                 weak_factory_.GetWeakPtr(),
+                 application_id,
+                 data,
+                 send_message_callback,
+                 service_worker_context));
+}
+
+void PushMessagingRouterImpl::FindServiceWorkerRegistration(
+    const PushMessagingApplicationId& application_id,
+    const std::string& data,
+    const SendMessageCallback& send_message_callback,
+    scoped_refptr<ServiceWorkerContextWrapper> service_worker_context) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  scoped_refptr<ServiceWorkerRegistration> service_worker_registration =
+      service_worker_context->context()->GetLiveRegistration(
+          application_id.service_worker_registration_id);
+  if (service_worker_registration) {
+    DoSendMessage(data, send_message_callback, service_worker_registration);
+  } else {
+    // If there is not currently a live registration, try to find one in
+    // storage. This path runs e.g. when the browser was not previously running
+    // and it was woken up for the purpose of delivering the push message.
+    service_worker_context->context()->storage()->FindRegistrationForId(
+        application_id.service_worker_registration_id,
+        application_id.origin,
+        base::Bind(
+            &PushMessagingRouterImpl::FindServiceWorkerRegistrationCallback,
+            weak_factory_.GetWeakPtr(),
+            application_id,
+            data,
+            send_message_callback));
+  }
+}
+
+void PushMessagingRouterImpl::FindServiceWorkerRegistrationCallback(
+    const PushMessagingApplicationId& application_id,

[johnme, 2014/07/23 14:25:23]

application_id appears to be unused.

[Michael van Ouwerkerk, 2014/07/23 16:57:51]

Done.

+    const std::string& data,
+    const SendMessageCallback& send_message_callback,
+    ServiceWorkerStatusCode service_worker_status,
+    const scoped_refptr<ServiceWorkerRegistration>&
+        service_worker_registration) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  if (service_worker_status == SERVICE_WORKER_OK) {
+    DoSendMessage(data, send_message_callback, service_worker_registration);
+  } else {
+    // TODO(mvanouwerkerk): UMA logging.
+    BrowserThread::PostTask(
+        BrowserThread::UI,
+        FROM_HERE,
+        base::Bind(
+            send_message_callback,
+            PUSH_MESSAGING_STATUS_MESSAGE_DELIVERY_FAILED_NO_SERVICE_WORKER));
+  }
+}
+
+void PushMessagingRouterImpl::DoSendMessage(

[johnme, 2014/07/23 14:25:23]

Nit: let's add a DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO)); for
clarity.

[Michael van Ouwerkerk, 2014/07/23 16:57:51]

Done.

+    const std::string& data,
+    const SendMessageCallback& send_message_callback,
+    const scoped_refptr<ServiceWorkerRegistration>&
+        service_worker_registration) {
+  // Hold on to the service worker registration in the callback to keep it alive
+  // until the callback dies. Otherwise the registration could be released when
+  // this method returns.

[johnme, 2014/07/23 14:25:23]

Nit: s/returns/returns (before the event is delivered to the Service Worker)/ ?

[Michael van Ouwerkerk, 2014/07/23 16:57:51]

Done.

+  base::Callback<void(ServiceWorkerStatusCode)> dispatch_event_callback =
+      base::Bind(&PushMessagingRouterImpl::SendMessageEnd,
+                 weak_factory_.GetWeakPtr(),
+                 send_message_callback,
+                 service_worker_registration);
+  service_worker_registration->active_version()->DispatchPushEvent(
+      dispatch_event_callback, data);
+}
+
+void PushMessagingRouterImpl::SendMessageEnd(
+    const SendMessageCallback& send_message_callback,
+    const scoped_refptr<ServiceWorkerRegistration>& service_worker_registration,
+    ServiceWorkerStatusCode service_worker_status) {
+  // TODO(mvanouwerkerk): UMA logging.
+  PushMessagingStatus push_messaging_status =
+      service_worker_status == SERVICE_WORKER_OK
+          ? PUSH_MESSAGING_STATUS_OK
+          : PUSH_MESSAGING_STATUS_MESSAGE_DELIVERY_FAILED_SERVICE_WORKER_ERROR;
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));

[johnme, 2014/07/23 14:25:23]

Nit: move to top of method?

[Michael van Ouwerkerk, 2014/07/23 16:57:51]

Done.

+  BrowserThread::PostTask(
+      BrowserThread::UI,
+      FROM_HERE,
+      base::Bind(send_message_callback, push_messaging_status));
+}
+
+}  // namespace content