[BackgroundSync] Handle storage failure

content/browser/background_sync/background_sync_manager.h

 // 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.
 
 #ifndef CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_MANAGER_H_
 #define CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_MANAGER_H_
 
 #include <list>
 #include <map>
 
 #include "base/callback_forward.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "content/browser/cache_storage/cache_storage_scheduler.h"
+#include "content/browser/service_worker/service_worker_context_observer.h"
 #include "content/browser/service_worker/service_worker_storage.h"
 #include "content/common/content_export.h"
 #include "content/common/service_worker/service_worker_status_code.h"
 #include "url/gurl.h"
 
 namespace content {
 
 class ServiceWorkerContextWrapper;
 
 // BackgroundSyncManager manages and stores the set of background sync
 // registrations across all registered service workers for a profile.
 // Registrations are stored along with their associated Service Worker
 // registration in ServiceWorkerStorage. If the ServiceWorker is unregistered,
 // the sync registrations are removed. This class expects to be run on the IO
 // thread. The asynchronous methods are executed sequentially.
 
 // TODO(jkarlin): Check permissions when registering, scheduling, and firing
 // background sync. In the meantime, --enable-service-worker-sync is required to
 // fire a sync event.
 // TODO(jkarlin): Unregister syncs when permission is revoked.
 // TODO(jkarlin): Create a background sync scheduler to actually run the
 // registered events.
 // TODO(jkarlin): Keep the browser alive if "Let Google Chrome Run in the
 // Background" is true and a sync is registered.
-// TODO(jkarlin): Unregister syncs when storage for an origin is cleared.
-// TODO(jkarlin): Detect and handle a corrupt or broken backend.
-class CONTENT_EXPORT BackgroundSyncManager {
+class CONTENT_EXPORT BackgroundSyncManager
+    : NON_EXPORTED_BASE(public ServiceWorkerContextObserver) {
  public:
   enum ErrorType {
     ERROR_TYPE_OK = 0,
     ERROR_TYPE_STORAGE,
     ERROR_TYPE_NOT_FOUND
   };
 
   // TODO(jkarlin): Remove this and use the struct from IPC messages once it
   // lands.
   struct CONTENT_EXPORT BackgroundSyncRegistration {
@@ skipping 29 matching lines @@
     NameToRegistrationMap name_to_registration_map;
     BackgroundSyncRegistration::RegistrationId next_id;
   };
 
   using StatusCallback = base::Callback<void(ErrorType)>;
   using StatusAndRegistrationCallback =
       base::Callback<void(ErrorType, const BackgroundSyncRegistration&)>;
 
   static scoped_ptr<BackgroundSyncManager> Create(
       const scoped_refptr<ServiceWorkerContextWrapper>& service_worker_context);
-  virtual ~BackgroundSyncManager();
+  ~BackgroundSyncManager() override;
 
   // Stores the given background sync registration and adds it to the scheduling
   // queue. Overwrites any existing registration with the same name but
   // different parameters (other than the id). Calls |callback| with ErrorTypeOK
   // and the accepted registration on success. The accepted registration will
   // have a unique id. It may also have altered parameters if the user or UA
   // chose different parameters than those supplied.
   void Register(const GURL& origin,
                 int64 sw_registration_id,
                 const BackgroundSyncRegistration& sync_registration,
@@ skipping 12 matching lines @@
       const StatusCallback& callback);
 
   // Finds the background sync registration associated with
   // |sw_registration_id|. Calls |callback| with ErrorTypeNotFound if it doesn't
   // exist. Calls |callback| with ErrorTypeOK on success.
   void GetRegistration(const GURL& origin,
                        int64 sw_registration_id,
                        const std::string sync_registration_name,
                        const StatusAndRegistrationCallback& callback);
 
+  // ServiceWorkerContextObserver overrides.
+  void OnRegistrationDeleted(int64 registration_id,
+                             const GURL& pattern) override;
+  void OnStorageWiped() override;
+
  protected:
   explicit BackgroundSyncManager(
       const scoped_refptr<ServiceWorkerContextWrapper>& context);
 
   // Init must be called before any public member function. Only call it once.
   void Init();
 
   // The following methods are virtual for testing.
   virtual void StoreDataInBackend(
       int64 sw_registration_id,
       const GURL& origin,
       const std::string& key,
       const std::string& data,
       const ServiceWorkerStorage::StatusCallback& callback);
   virtual void GetDataFromBackend(
       const std::string& key,
       const ServiceWorkerStorage::GetUserDataForAllRegistrationsCallback&
           callback);
 
  private:
   using PermissionStatusCallback = base::Callback<void(bool)>;
   using SWIdToRegistrationsMap = std::map<int64, BackgroundSyncRegistrations>;
 
+  // Disable the manager. Already queued operations will abort once they start
+  // to run (in their impl methods). Future operations will not queue. Any
+  // registrations are cleared from memory and the backend (if it's still
+  // functioning). The manager will reenable itself once it receives the
+  // OnStorageWiped message or on browser restart.
+  void DisableAndClearManager();
+  void DisableAndClearManagerImpl(const base::Closure& callback);
+  void DisableAndClearDidGetRegistrations(
+      const base::Closure& callback,
+      const std::vector<std::pair<int64, std::string>>& user_data,
+      ServiceWorkerStatusCode status);
+  void DisableAndClearManagerClearedOne(const base::Closure& barrier_closure,
+                                        ServiceWorkerStatusCode status);
+
   // Returns the existing registration in |existing_registration| if it is not
   // null.
   bool LookupRegistration(int64 sw_registration_id,
                           const std::string& sync_registration_name,
                           BackgroundSyncRegistration* existing_registration);
 
   // Store all registrations for a given |sw_registration_id|.
   void StoreRegistrations(const GURL& origin,
                           int64 sw_registration_id,
                           const ServiceWorkerStorage::StatusCallback& callback);
 
   // If the registration is in the map, removes it and returns the removed
   // registration in |old_registration|. |old_registration| may be null.
   void RemoveRegistrationFromMap(int64 sw_registration_id,
                                  const std::string& sync_registration_name,
                                  BackgroundSyncRegistration* old_registration);
 
   void AddRegistrationToMap(
       int64 sw_registration_id,
       const BackgroundSyncRegistration& sync_registration);
 
-  void InitImpl();
+  void InitImpl(const base::Closure& callback);
   void InitDidGetDataFromBackend(
+      const base::Closure& callback,
       const std::vector<std::pair<int64, std::string>>& user_data,
       ServiceWorkerStatusCode status);
 
   // Register callbacks
   void RegisterImpl(const GURL& origin,
                     int64 sw_registration_id,
                     const BackgroundSyncRegistration& sync_registration,
                     const StatusAndRegistrationCallback& callback);
   void RegisterDidStore(int64 sw_registration_id,
                         const BackgroundSyncRegistration& sync_registration,
-                        const BackgroundSyncRegistration& previous_registration,
                         const StatusAndRegistrationCallback& callback,
                         ServiceWorkerStatusCode status);
 
   // Unregister callbacks
   void UnregisterImpl(
       const GURL& origin,
       int64 sw_registration_id,
       const std::string& sync_registration_name,
       BackgroundSyncRegistration::RegistrationId sync_registration_id,
       const StatusCallback& callback);
   void UnregisterDidStore(
       int64 sw_registration_id,
       const BackgroundSyncRegistration& old_sync_registration,
       const StatusCallback& callback,
       ServiceWorkerStatusCode status);
 
   // GetRegistration callbacks
   void GetRegistrationImpl(const GURL& origin,
                            int64 sw_registration_id,
                            const std::string sync_registration_name,
                            const StatusAndRegistrationCallback& callback);
 
+  // OnRegistrationDeleted callbacks
+  void OnRegistrationDeletedImpl(int64 registration_id,
+                                 const base::Closure& callback);
+
+  // OnStorageWiped callbacks
+  void OnStorageWipedImpl(const base::Closure& callback);
+
   // Operation Scheduling callbacks
   void PendingStatusAndRegistrationCallback(
       const StatusAndRegistrationCallback& callback,
       ErrorType error,
       const BackgroundSyncRegistration& sync_registration);
   void PendingStatusCallback(const StatusCallback& callback, ErrorType error);
+  void PendingClosure(const base::Closure& closure);
 
   SWIdToRegistrationsMap sw_to_registrations_map_;
   CacheStorageScheduler op_scheduler_;
   scoped_refptr<ServiceWorkerContextWrapper> service_worker_context_;
+  bool disabled_;
 
   base::WeakPtrFactory<BackgroundSyncManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundSyncManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_MANAGER_H_