chrome/browser/sync/glue/sync_backend_host_impl.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_SYNC_GLUE_SYNC_BACKEND_HOST_IMPL_H_
   6 #define CHROME_BROWSER_SYNC_GLUE_SYNC_BACKEND_HOST_IMPL_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/callback.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/memory/weak_ptr.h"
  15 #include "base/threading/thread.h"
  16 #include "chrome/browser/sync/glue/backend_data_type_configurer.h"
  17 #include "chrome/browser/sync/glue/extensions_activity_monitor.h"
  18 #include "chrome/browser/sync/glue/sync_backend_host.h"
  19 #include "content/public/browser/notification_observer.h"
  20 #include "content/public/browser/notification_registrar.h"
  21 #include "sync/internal_api/public/base/model_type.h"
  22 #include "sync/internal_api/public/configure_reason.h"
  23 #include "sync/internal_api/public/sessions/sync_session_snapshot.h"
  24 #include "sync/internal_api/public/sync_manager.h"
  25 #include "sync/internal_api/public/util/report_unrecoverable_error_function.h"
  26 #include "sync/internal_api/public/util/unrecoverable_error_handler.h"
  27 #include "sync/internal_api/public/util/weak_handle.h"
  28 #include "sync/notifier/invalidation_handler.h"
  29 #include "sync/protocol/encryption.pb.h"
  30 #include "sync/protocol/sync_protocol_error.h"
  31 #include "sync/util/extensions_activity.h"
  32
  33 class GURL;
  34 class Profile;
  35
  36 namespace base {
  37 class MessageLoop;
  38 }
  39
  40 namespace invalidation {
  41 class InvalidationService;
  42 }
  43
  44 namespace syncer {
  45 class NetworkResources;
  46 class SyncManagerFactory;
  47 }
  48
  49 namespace browser_sync {
  50
  51 class ChangeProcessor;
  52 class SyncBackendHostCore;
  53 class SyncBackendRegistrar;
  54 class SyncPrefs;
  55 class SyncedDeviceTracker;
  56 struct DoInitializeOptions;
  57
  58 // The only real implementation of the SyncBackendHost.  See that interface's
  59 // definition for documentation of public methods.
  60 class SyncBackendHostImpl
  61     : public SyncBackendHost,
  62       public content::NotificationObserver,
  63       public syncer::InvalidationHandler {
  64  public:
  65   typedef syncer::SyncStatus Status;
  66
  67   // Create a SyncBackendHost with a reference to the |frontend| that
  68   // it serves and communicates to via the SyncFrontend interface (on
  69   // the same thread it used to call the constructor).  Must outlive
  70   // |sync_prefs|.
  71   SyncBackendHostImpl(
  72       const std::string& name,
  73       Profile* profile,
  74       const base::WeakPtr<SyncPrefs>& sync_prefs);
  75   virtual ~SyncBackendHostImpl();
  76
  77   // SyncBackendHost implementation.
  78   virtual void Initialize(
  79       SyncFrontend* frontend,
  80       scoped_ptr<base::Thread> sync_thread,
  81       const syncer::WeakHandle<syncer::JsEventHandler>& event_handler,
  82       const GURL& service_url,
  83       const syncer::SyncCredentials& credentials,
  84       bool delete_sync_data_folder,
  85       scoped_ptr<syncer::SyncManagerFactory> sync_manager_factory,
  86       scoped_ptr<syncer::UnrecoverableErrorHandler> unrecoverable_error_handler,
  87       syncer::ReportUnrecoverableErrorFunction
  88           report_unrecoverable_error_function,
  89       syncer::NetworkResources* network_resources) OVERRIDE;
  90   virtual void UpdateCredentials(
  91       const syncer::SyncCredentials& credentials) OVERRIDE;
  92   virtual void StartSyncingWithServer() OVERRIDE;
  93   virtual void SetEncryptionPassphrase(
  94       const std::string& passphrase,
  95       bool is_explicit) OVERRIDE;
  96   virtual bool SetDecryptionPassphrase(const std::string& passphrase)
  97       OVERRIDE WARN_UNUSED_RESULT;
  98   virtual void StopSyncingForShutdown() OVERRIDE;
  99   virtual scoped_ptr<base::Thread> Shutdown(ShutdownOption option) OVERRIDE;
 100   virtual void UnregisterInvalidationIds() OVERRIDE;
 101   virtual void ConfigureDataTypes(
 102       syncer::ConfigureReason reason,
 103       const DataTypeConfigStateMap& config_state_map,
 104       const base::Callback<void(syncer::ModelTypeSet,
 105                                 syncer::ModelTypeSet)>& ready_task,
 106       const base::Callback<void()>& retry_callback) OVERRIDE;
 107   virtual void EnableEncryptEverything() OVERRIDE;
 108   virtual void ActivateDataType(
 109       syncer::ModelType type, syncer::ModelSafeGroup group,
 110       ChangeProcessor* change_processor) OVERRIDE;
 111   virtual void DeactivateDataType(syncer::ModelType type) OVERRIDE;
 112   virtual syncer::UserShare* GetUserShare() const OVERRIDE;
 113   virtual Status GetDetailedStatus() OVERRIDE;
 114   virtual syncer::sessions::SyncSessionSnapshot
 115       GetLastSessionSnapshot() const OVERRIDE;
 116   virtual bool HasUnsyncedItems() const OVERRIDE;
 117   virtual bool IsNigoriEnabled() const OVERRIDE;
 118   virtual syncer::PassphraseType GetPassphraseType() const OVERRIDE;
 119   virtual base::Time GetExplicitPassphraseTime() const OVERRIDE;
 120   virtual bool IsCryptographerReady(
 121       const syncer::BaseTransaction* trans) const OVERRIDE;
 122   virtual void GetModelSafeRoutingInfo(
 123       syncer::ModelSafeRoutingInfo* out) const OVERRIDE;
 124   virtual SyncedDeviceTracker* GetSyncedDeviceTracker() const OVERRIDE;
 125   virtual base::MessageLoop* GetSyncLoopForTesting() OVERRIDE;
 126
 127  protected:
 128   // The types and functions below are protected so that test
 129   // subclasses can use them.
 130
 131   // Allows tests to perform alternate core initialization work.
 132   virtual void InitCore(scoped_ptr<DoInitializeOptions> options);
 133
 134   // Request the syncer to reconfigure with the specfied params.
 135   // Virtual for testing.
 136   virtual void RequestConfigureSyncer(
 137       syncer::ConfigureReason reason,
 138       syncer::ModelTypeSet to_download,
 139       syncer::ModelTypeSet to_purge,
 140       syncer::ModelTypeSet to_journal,
 141       syncer::ModelTypeSet to_unapply,
 142       syncer::ModelTypeSet to_ignore,
 143       const syncer::ModelSafeRoutingInfo& routing_info,
 144       const base::Callback<void(syncer::ModelTypeSet,
 145                                 syncer::ModelTypeSet)>& ready_task,
 146       const base::Closure& retry_callback);
 147
 148   // Called when the syncer has finished performing a configuration.
 149   void FinishConfigureDataTypesOnFrontendLoop(
 150       const syncer::ModelTypeSet enabled_types,
 151       const syncer::ModelTypeSet succeeded_configuration_types,
 152       const syncer::ModelTypeSet failed_configuration_types,
 153       const base::Callback<void(syncer::ModelTypeSet,
 154                                 syncer::ModelTypeSet)>& ready_task);
 155
 156   // Reports backend initialization success.  Includes some objects from sync
 157   // manager initialization to be passed back to the UI thread.
 158   virtual void HandleInitializationSuccessOnFrontendLoop(
 159     const syncer::WeakHandle<syncer::JsBackend> js_backend,
 160     const syncer::WeakHandle<syncer::DataTypeDebugInfoListener>
 161         debug_info_listener);
 162
 163   // Downloading of control types failed and will be retried. Invokes the
 164   // frontend's sync configure retry method.
 165   void HandleControlTypesDownloadRetry();
 166
 167   SyncFrontend* frontend() { return frontend_; }
 168
 169  private:
 170   friend class SyncBackendHostCore;
 171
 172   // Checks if we have received a notice to turn on experimental datatypes
 173   // (via the nigori node) and informs the frontend if that is the case.
 174   // Note: it is illegal to call this before the backend is initialized.
 175   void AddExperimentalTypes();
 176
 177   // Handles backend initialization failure.
 178   void HandleInitializationFailureOnFrontendLoop();
 179
 180   // Called from Core::OnSyncCycleCompleted to handle updating frontend
 181   // thread components.
 182   void HandleSyncCycleCompletedOnFrontendLoop(
 183       const syncer::sessions::SyncSessionSnapshot& snapshot);
 184
 185   // Called when the syncer failed to perform a configuration and will
 186   // eventually retry. FinishingConfigurationOnFrontendLoop(..) will be called
 187   // on successful completion.
 188   void RetryConfigurationOnFrontendLoop(const base::Closure& retry_callback);
 189
 190   // Helpers to persist a token that can be used to bootstrap sync encryption
 191   // across browser restart to avoid requiring the user to re-enter their
 192   // passphrase.  |token| must be valid UTF-8 as we use the PrefService for
 193   // storage.
 194   void PersistEncryptionBootstrapToken(
 195       const std::string& token,
 196       syncer::BootstrapTokenType token_type);
 197
 198   // For convenience, checks if initialization state is INITIALIZED.
 199   bool initialized() const { return initialized_; }
 200
 201   // Let the front end handle the actionable error event.
 202   void HandleActionableErrorEventOnFrontendLoop(
 203       const syncer::SyncProtocolError& sync_error);
 204
 205   // Checks if |passphrase| can be used to decrypt the cryptographer's pending
 206   // keys that were cached during NotifyPassphraseRequired. Returns true if
 207   // decryption was successful. Returns false otherwise. Must be called with a
 208   // non-empty pending keys cache.
 209   bool CheckPassphraseAgainstCachedPendingKeys(
 210       const std::string& passphrase) const;
 211
 212   // Invoked when a passphrase is required to decrypt a set of Nigori keys,
 213   // or for encrypting. |reason| denotes why the passphrase was required.
 214   // |pending_keys| is a copy of the cryptographer's pending keys, that are
 215   // cached by the frontend. If there are no pending keys, or if the passphrase
 216   // required reason is REASON_ENCRYPTION, an empty EncryptedData object is
 217   // passed.
 218   void NotifyPassphraseRequired(syncer::PassphraseRequiredReason reason,
 219                                 sync_pb::EncryptedData pending_keys);
 220
 221   // Invoked when the passphrase provided by the user has been accepted.
 222   void NotifyPassphraseAccepted();
 223
 224   // Invoked when the set of encrypted types or the encrypt
 225   // everything flag changes.
 226   void NotifyEncryptedTypesChanged(
 227       syncer::ModelTypeSet encrypted_types,
 228       bool encrypt_everything);
 229
 230   // Invoked when sync finishes encrypting new datatypes.
 231   void NotifyEncryptionComplete();
 232
 233   // Invoked when the passphrase state has changed. Caches the passphrase state
 234   // for later use on the UI thread.
 235   // If |type| is FROZEN_IMPLICIT_PASSPHRASE or CUSTOM_PASSPHRASE,
 236   // |explicit_passphrase_time| is the time at which that passphrase was set
 237   // (if available).
 238   void HandlePassphraseTypeChangedOnFrontendLoop(
 239       syncer::PassphraseType type,
 240       base::Time explicit_passphrase_time);
 241
 242   void HandleStopSyncingPermanentlyOnFrontendLoop();
 243
 244   // Dispatched to from OnConnectionStatusChange to handle updating
 245   // frontend UI components.
 246   void HandleConnectionStatusChangeOnFrontendLoop(
 247       syncer::ConnectionStatus status);
 248
 249   // NotificationObserver implementation.
 250   virtual void Observe(
 251     int type,
 252     const content::NotificationSource& source,
 253     const content::NotificationDetails& details) OVERRIDE;
 254
 255   // InvalidationHandler implementation.
 256   virtual void OnInvalidatorStateChange(
 257       syncer::InvalidatorState state) OVERRIDE;
 258   virtual void OnIncomingInvalidation(
 259       const syncer::ObjectIdInvalidationMap& invalidation_map) OVERRIDE;
 260
 261   content::NotificationRegistrar notification_registrar_;
 262
 263   // A reference to the MessageLoop used to construct |this|, so we know how
 264   // to safely talk back to the SyncFrontend.
 265   base::MessageLoop* const frontend_loop_;
 266
 267   Profile* const profile_;
 268
 269   // Name used for debugging (set from profile_->GetDebugName()).
 270   const std::string name_;
 271
 272   // Our core, which communicates directly to the syncapi. Use refptr instead
 273   // of WeakHandle because |core_| is created on UI loop but released on
 274   // sync loop.
 275   scoped_refptr<SyncBackendHostCore> core_;
 276
 277   bool initialized_;
 278
 279   const base::WeakPtr<SyncPrefs> sync_prefs_;
 280
 281   ExtensionsActivityMonitor extensions_activity_monitor_;
 282
 283   scoped_ptr<SyncBackendRegistrar> registrar_;
 284
 285   // The frontend which we serve (and are owned by).
 286   SyncFrontend* frontend_;
 287
 288   // We cache the cryptographer's pending keys whenever NotifyPassphraseRequired
 289   // is called. This way, before the UI calls SetDecryptionPassphrase on the
 290   // syncer, it can avoid the overhead of an asynchronous decryption call and
 291   // give the user immediate feedback about the passphrase entered by first
 292   // trying to decrypt the cached pending keys on the UI thread. Note that
 293   // SetDecryptionPassphrase can still fail after the cached pending keys are
 294   // successfully decrypted if the pending keys have changed since the time they
 295   // were cached.
 296   sync_pb::EncryptedData cached_pending_keys_;
 297
 298   // The state of the passphrase required to decrypt the bag of encryption keys
 299   // in the nigori node. Updated whenever a new nigori node arrives or the user
 300   // manually changes their passphrase state. Cached so we can synchronously
 301   // check it from the UI thread.
 302   syncer::PassphraseType cached_passphrase_type_;
 303
 304   // If an explicit passphrase is in use, the time at which the passphrase was
 305   // first set (if available).
 306   base::Time cached_explicit_passphrase_time_;
 307
 308   // UI-thread cache of the last SyncSessionSnapshot received from syncapi.
 309   syncer::sessions::SyncSessionSnapshot last_snapshot_;
 310
 311   invalidation::InvalidationService* invalidator_;
 312   bool invalidation_handler_registered_;
 313
 314   base::WeakPtrFactory<SyncBackendHostImpl> weak_ptr_factory_;
 315
 316   DISALLOW_COPY_AND_ASSIGN(SyncBackendHostImpl);
 317 };
 318
 319 }  // namespace browser_sync
 320
 321 #endif  // CHROME_BROWSER_SYNC_GLUE_SYNC_BACKEND_HOST_IMPL_H_
 322