Ports XMPP Invalidation code from drive_file_sync_service in /sync_file_system to /google_apis/driv…

chrome/browser/google_apis/drive_notification_manager.cc

 // Copyright 2013 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 "chrome/browser/google_apis/drive_notification_manager.h"
 
 #include "chrome/browser/google_apis/drive_notification_observer.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/sync/profile_sync_service.h"
+#include "chrome/browser/sync/profile_sync_service_factory.h"
+#include "google/cacheinvalidation/types.pb.h"
 
 namespace google_apis {
 
-// TODO(calvinlo): Constants for polling and XMPP sync mechanisms go here.
+// The sync invalidation object ID for Google Drive.
+const char kDriveInvalidationObjectId[] = "CHANGELOG";
+
+// TODO(calvinlo): Constants for polling to go here.
 
 DriveNotificationManager::DriveNotificationManager(Profile* profile)
-    : profile_(profile) {
-  // TODO(calvinlo): Initialize member variables for polling and XMPP here.
+    : profile_(profile),
+      push_notification_registered_(false),
+      push_notification_enabled_(false) {
+  // TODO(calvinlo): Initialize member variables for polling here.
+  RegisterDriveNotifications();
 }
 
 DriveNotificationManager::~DriveNotificationManager() {}
 
 void DriveNotificationManager::Shutdown() {
-  // TODO(calvinlo): Unregister for Drive notifications goes here.
+  // Unregister for Drive notifications.
+  ProfileSyncService* profile_sync_service =
+      ProfileSyncServiceFactory::GetForProfile(profile_);
+  if (!profile_sync_service || !push_notification_registered_) {
+    return;
+  }
+
+  profile_sync_service->UpdateRegisteredInvalidationIds(
+      this, syncer::ObjectIdSet());
+  profile_sync_service->UnregisterInvalidationHandler(this);
 }
 
-// TODO(calvinlo): Implementations for syncer::InvalidationHandler go here.
-// Implement OnInvalidatorStateChange() and OnIncomingInvalidation().
+void DriveNotificationManager::OnInvalidatorStateChange(
+    syncer::InvalidatorState state) {
+  SetPushNotificationEnabled(state);
+}
+
+void DriveNotificationManager::OnIncomingInvalidation(
+    const syncer::ObjectIdInvalidationMap& invalidation_map) {
+  DVLOG(2) << "XMPP Drive Notification Received";
+  DCHECK_EQ(1U, invalidation_map.size());
+  const invalidation::ObjectId object_id(
+      ipc::invalidation::ObjectSource::COSMO_CHANGELOG,
+      kDriveInvalidationObjectId);
+  DCHECK_EQ(1U, invalidation_map.count(object_id));
+
+  // TODO(dcheng): Only acknowledge the invalidation once the fetch has
+  // completed. http://crbug.com/156843
+  ProfileSyncService* profile_sync_service =
+      ProfileSyncServiceFactory::GetForProfile(profile_);
+  CHECK(profile_sync_service);
+  profile_sync_service->AcknowledgeInvalidation(
+      invalidation_map.begin()->first,
+      invalidation_map.begin()->second.ack_handle);
+
+  NotifyObserversToUpdate();
+}
 
 void DriveNotificationManager::AddObserver(
     DriveNotificationObserver* observer) {
   observers_.AddObserver(observer);
 }
 
 void DriveNotificationManager::RemoveObserver(
     DriveNotificationObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
 void DriveNotificationManager::NotifyObserversToUpdate() {
   FOR_EACH_OBSERVER(DriveNotificationObserver, observers_, CheckForUpdates());
 }
 
+// Register for Google Drive invalidation notifications through XMPP.
+void DriveNotificationManager::RegisterDriveNotifications() {
+  // Push notification registration might have already occurred if called from
+  // a different extension.
+  if (!IsDriveNotificationSupported() || push_notification_registered_)
+    return;
+
+  ProfileSyncService* profile_sync_service =
+      ProfileSyncServiceFactory::GetForProfile(profile_);
+  if (!profile_sync_service)
+    return;
+
+  profile_sync_service->RegisterInvalidationHandler(this);
+  syncer::ObjectIdSet ids;
+  ids.insert(invalidation::ObjectId(
+      ipc::invalidation::ObjectSource::COSMO_CHANGELOG,
+      kDriveInvalidationObjectId));
+  profile_sync_service->UpdateRegisteredInvalidationIds(this, ids);
+  push_notification_registered_ = true;
+  SetPushNotificationEnabled(profile_sync_service->GetInvalidatorState());
+}
+
+// TODO(calvinlo): Remove when all patches for http://crbug.com/173339 done.
+bool DriveNotificationManager::IsDriveNotificationSupported() {
+  // TODO(calvinlo): A invalidation ID can only be registered to one handler.
+  // Therefore ChromeOS and SyncFS cannot both use XMPP notifications until
+  // (http://crbug.com/173339) is completed.
+  // For now, disable XMPP notifications for SyncFC on ChromeOS to guarantee
+  // that ChromeOS's file manager can register itself to the invalidationID.
+
+#if defined(OS_CHROMEOS)
+  return false;
+#else
+  return true;
+#endif
+}
+
+void DriveNotificationManager::SetPushNotificationEnabled(
+    syncer::InvalidatorState state) {
+  DVLOG(1) << "SetPushNotificationEnabled() with state=" << state;
+  push_notification_enabled_ = (state == syncer::INVALIDATIONS_ENABLED);
+  if (!push_notification_enabled_)
+    return;
+
+  // Push notifications are enabled so reset polling timer.
+  //UpdatePollingDelay(kPollingDelaySecondsWithNotification);
+}
+
 }  // namespace google_apis