src/sync/internal_api/sync_manager_impl.cc

   1 // Copyright (c) 2012 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 #include "sync/internal_api/sync_manager_impl.h"
   6
   7 #include <string>
   8
   9 #include "base/base64.h"
  10 #include "base/bind.h"
  11 #include "base/callback.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/json/json_writer.h"
  14 #include "base/memory/ref_counted.h"
  15 #include "base/metrics/histogram.h"
  16 #include "base/observer_list.h"
  17 #include "base/strings/string_number_conversions.h"
  18 #include "base/thread_task_runner_handle.h"
  19 #include "base/values.h"
  20 #include "sync/engine/sync_scheduler.h"
  21 #include "sync/engine/syncer_types.h"
  22 #include "sync/internal_api/change_reorder_buffer.h"
  23 #include "sync/internal_api/public/base/cancelation_signal.h"
  24 #include "sync/internal_api/public/base/invalidation_interface.h"
  25 #include "sync/internal_api/public/base/model_type.h"
  26 #include "sync/internal_api/public/base_node.h"
  27 #include "sync/internal_api/public/configure_reason.h"
  28 #include "sync/internal_api/public/engine/polling_constants.h"
  29 #include "sync/internal_api/public/http_post_provider_factory.h"
  30 #include "sync/internal_api/public/internal_components_factory.h"
  31 #include "sync/internal_api/public/read_node.h"
  32 #include "sync/internal_api/public/read_transaction.h"
  33 #include "sync/internal_api/public/sync_context.h"
  34 #include "sync/internal_api/public/sync_context_proxy.h"
  35 #include "sync/internal_api/public/user_share.h"
  36 #include "sync/internal_api/public/util/experiments.h"
  37 #include "sync/internal_api/public/write_node.h"
  38 #include "sync/internal_api/public/write_transaction.h"
  39 #include "sync/internal_api/sync_context_proxy_impl.h"
  40 #include "sync/internal_api/syncapi_internal.h"
  41 #include "sync/internal_api/syncapi_server_connection_manager.h"
  42 #include "sync/protocol/proto_value_conversions.h"
  43 #include "sync/protocol/sync.pb.h"
  44 #include "sync/sessions/directory_type_debug_info_emitter.h"
  45 #include "sync/syncable/directory.h"
  46 #include "sync/syncable/entry.h"
  47 #include "sync/syncable/in_memory_directory_backing_store.h"
  48 #include "sync/syncable/on_disk_directory_backing_store.h"
  49
  50 using base::TimeDelta;
  51 using sync_pb::GetUpdatesCallerInfo;
  52
  53 class GURL;
  54
  55 namespace syncer {
  56
  57 using sessions::SyncSessionContext;
  58 using syncable::ImmutableWriteTransactionInfo;
  59 using syncable::SPECIFICS;
  60 using syncable::UNIQUE_POSITION;
  61
  62 namespace {
  63
  64 GetUpdatesCallerInfo::GetUpdatesSource GetSourceFromReason(
  65     ConfigureReason reason) {
  66   switch (reason) {
  67     case CONFIGURE_REASON_RECONFIGURATION:
  68       return GetUpdatesCallerInfo::RECONFIGURATION;
  69     case CONFIGURE_REASON_MIGRATION:
  70       return GetUpdatesCallerInfo::MIGRATION;
  71     case CONFIGURE_REASON_NEW_CLIENT:
  72       return GetUpdatesCallerInfo::NEW_CLIENT;
  73     case CONFIGURE_REASON_NEWLY_ENABLED_DATA_TYPE:
  74     case CONFIGURE_REASON_CRYPTO:
  75       return GetUpdatesCallerInfo::NEWLY_SUPPORTED_DATATYPE;
  76     case CONFIGURE_REASON_PROGRAMMATIC:
  77       return GetUpdatesCallerInfo::PROGRAMMATIC;
  78     default:
  79       NOTREACHED();
  80   }
  81   return GetUpdatesCallerInfo::UNKNOWN;
  82 }
  83
  84 }  // namespace
  85
  86 SyncManagerImpl::SyncManagerImpl(const std::string& name)
  87     : name_(name),
  88       change_delegate_(NULL),
  89       initialized_(false),
  90       observing_network_connectivity_changes_(false),
  91       report_unrecoverable_error_function_(NULL),
  92       weak_ptr_factory_(this) {
  93   // Pre-fill |notification_info_map_|.
  94   for (int i = FIRST_REAL_MODEL_TYPE; i < MODEL_TYPE_COUNT; ++i) {
  95     notification_info_map_.insert(
  96         std::make_pair(ModelTypeFromInt(i), NotificationInfo()));
  97   }
  98 }
  99
 100 SyncManagerImpl::~SyncManagerImpl() {
 101   DCHECK(thread_checker_.CalledOnValidThread());
 102   CHECK(!initialized_);
 103 }
 104
 105 SyncManagerImpl::NotificationInfo::NotificationInfo() : total_count(0) {}
 106 SyncManagerImpl::NotificationInfo::~NotificationInfo() {}
 107
 108 base::DictionaryValue* SyncManagerImpl::NotificationInfo::ToValue() const {
 109   base::DictionaryValue* value = new base::DictionaryValue();
 110   value->SetInteger("totalCount", total_count);
 111   value->SetString("payload", payload);
 112   return value;
 113 }
 114
 115 bool SyncManagerImpl::VisiblePositionsDiffer(
 116     const syncable::EntryKernelMutation& mutation) const {
 117   const syncable::EntryKernel& a = mutation.original;
 118   const syncable::EntryKernel& b = mutation.mutated;
 119   if (!b.ShouldMaintainPosition())
 120     return false;
 121   if (!a.ref(UNIQUE_POSITION).Equals(b.ref(UNIQUE_POSITION)))
 122     return true;
 123   if (a.ref(syncable::PARENT_ID) != b.ref(syncable::PARENT_ID))
 124     return true;
 125   return false;
 126 }
 127
 128 bool SyncManagerImpl::VisiblePropertiesDiffer(
 129     const syncable::EntryKernelMutation& mutation,
 130     Cryptographer* cryptographer) const {
 131   const syncable::EntryKernel& a = mutation.original;
 132   const syncable::EntryKernel& b = mutation.mutated;
 133   const sync_pb::EntitySpecifics& a_specifics = a.ref(SPECIFICS);
 134   const sync_pb::EntitySpecifics& b_specifics = b.ref(SPECIFICS);
 135   DCHECK_EQ(GetModelTypeFromSpecifics(a_specifics),
 136             GetModelTypeFromSpecifics(b_specifics));
 137   ModelType model_type = GetModelTypeFromSpecifics(b_specifics);
 138   // Suppress updates to items that aren't tracked by any browser model.
 139   if (model_type < FIRST_REAL_MODEL_TYPE ||
 140       !a.ref(syncable::UNIQUE_SERVER_TAG).empty()) {
 141     return false;
 142   }
 143   if (a.ref(syncable::IS_DIR) != b.ref(syncable::IS_DIR))
 144     return true;
 145   if (!AreSpecificsEqual(cryptographer,
 146                          a.ref(syncable::SPECIFICS),
 147                          b.ref(syncable::SPECIFICS))) {
 148     return true;
 149   }
 150   if (!AreAttachmentMetadataEqual(a.ref(syncable::ATTACHMENT_METADATA),
 151                                   b.ref(syncable::ATTACHMENT_METADATA))) {
 152     return true;
 153   }
 154   // We only care if the name has changed if neither specifics is encrypted
 155   // (encrypted nodes blow away the NON_UNIQUE_NAME).
 156   if (!a_specifics.has_encrypted() && !b_specifics.has_encrypted() &&
 157       a.ref(syncable::NON_UNIQUE_NAME) != b.ref(syncable::NON_UNIQUE_NAME))
 158     return true;
 159   if (VisiblePositionsDiffer(mutation))
 160     return true;
 161   return false;
 162 }
 163
 164 ModelTypeSet SyncManagerImpl::InitialSyncEndedTypes() {
 165   return directory()->InitialSyncEndedTypes();
 166 }
 167
 168 ModelTypeSet SyncManagerImpl::GetTypesWithEmptyProgressMarkerToken(
 169     ModelTypeSet types) {
 170   ModelTypeSet result;
 171   for (ModelTypeSet::Iterator i = types.First(); i.Good(); i.Inc()) {
 172     sync_pb::DataTypeProgressMarker marker;
 173     directory()->GetDownloadProgress(i.Get(), &marker);
 174
 175     if (marker.token().empty())
 176       result.Put(i.Get());
 177   }
 178   return result;
 179 }
 180
 181 void SyncManagerImpl::ConfigureSyncer(
 182     ConfigureReason reason,
 183     ModelTypeSet to_download,
 184     ModelTypeSet to_purge,
 185     ModelTypeSet to_journal,
 186     ModelTypeSet to_unapply,
 187     const ModelSafeRoutingInfo& new_routing_info,
 188     const base::Closure& ready_task,
 189     const base::Closure& retry_task) {
 190   DCHECK(thread_checker_.CalledOnValidThread());
 191   DCHECK(!ready_task.is_null());
 192   DCHECK(initialized_);
 193
 194   DVLOG(1) << "Configuring -"
 195            << "\n\t" << "current types: "
 196            << ModelTypeSetToString(GetRoutingInfoTypes(new_routing_info))
 197            << "\n\t" << "types to download: "
 198            << ModelTypeSetToString(to_download)
 199            << "\n\t" << "types to purge: "
 200            << ModelTypeSetToString(to_purge)
 201            << "\n\t" << "types to journal: "
 202            << ModelTypeSetToString(to_journal)
 203            << "\n\t" << "types to unapply: "
 204            << ModelTypeSetToString(to_unapply);
 205   if (!PurgeDisabledTypes(to_purge,
 206                           to_journal,
 207                           to_unapply)) {
 208     // We failed to cleanup the types. Invoke the ready task without actually
 209     // configuring any types. The caller should detect this as a configuration
 210     // failure and act appropriately.
 211     ready_task.Run();
 212     return;
 213   }
 214
 215   ConfigurationParams params(GetSourceFromReason(reason),
 216                              to_download,
 217                              new_routing_info,
 218                              ready_task,
 219                              retry_task);
 220
 221   scheduler_->Start(SyncScheduler::CONFIGURATION_MODE);
 222   scheduler_->ScheduleConfiguration(params);
 223 }
 224
 225 void SyncManagerImpl::Init(InitArgs* args) {
 226   CHECK(!initialized_);
 227   DCHECK(thread_checker_.CalledOnValidThread());
 228   DCHECK(args->post_factory.get());
 229   DCHECK(!args->credentials.email.empty());
 230   DCHECK(!args->credentials.sync_token.empty());
 231   DCHECK(!args->credentials.scope_set.empty());
 232   DCHECK(args->cancelation_signal);
 233   DVLOG(1) << "SyncManager starting Init...";
 234
 235   weak_handle_this_ = MakeWeakHandle(weak_ptr_factory_.GetWeakPtr());
 236
 237   change_delegate_ = args->change_delegate;
 238
 239   AddObserver(&js_sync_manager_observer_);
 240   SetJsEventHandler(args->event_handler);
 241
 242   AddObserver(&debug_info_event_listener_);
 243
 244   database_path_ = args->database_location.Append(
 245       syncable::Directory::kSyncDatabaseFilename);
 246   unrecoverable_error_handler_ = args->unrecoverable_error_handler.Pass();
 247   report_unrecoverable_error_function_ =
 248       args->report_unrecoverable_error_function;
 249
 250   allstatus_.SetHasKeystoreKey(
 251       !args->restored_keystore_key_for_bootstrapping.empty());
 252   sync_encryption_handler_.reset(new SyncEncryptionHandlerImpl(
 253       &share_,
 254       args->encryptor,
 255       args->restored_key_for_bootstrapping,
 256       args->restored_keystore_key_for_bootstrapping));
 257   sync_encryption_handler_->AddObserver(this);
 258   sync_encryption_handler_->AddObserver(&debug_info_event_listener_);
 259   sync_encryption_handler_->AddObserver(&js_sync_encryption_handler_observer_);
 260
 261   base::FilePath absolute_db_path = database_path_;
 262   DCHECK(absolute_db_path.IsAbsolute());
 263
 264   scoped_ptr<syncable::DirectoryBackingStore> backing_store =
 265       args->internal_components_factory->BuildDirectoryBackingStore(
 266           InternalComponentsFactory::STORAGE_ON_DISK,
 267           args->credentials.email, absolute_db_path).Pass();
 268
 269   DCHECK(backing_store.get());
 270   share_.directory.reset(
 271       new syncable::Directory(
 272           backing_store.release(),
 273           unrecoverable_error_handler_.get(),
 274           report_unrecoverable_error_function_,
 275           sync_encryption_handler_.get(),
 276           sync_encryption_handler_->GetCryptographerUnsafe()));
 277   share_.sync_credentials = args->credentials;
 278
 279   // UserShare is accessible to a lot of code that doesn't need access to the
 280   // sync token so clear sync_token from the UserShare.
 281   share_.sync_credentials.sync_token = "";
 282
 283   const std::string& username = args->credentials.email;
 284   DVLOG(1) << "Username: " << username;
 285   if (!OpenDirectory(username)) {
 286     NotifyInitializationFailure();
 287     LOG(ERROR) << "Sync manager initialization failed!";
 288     return;
 289   }
 290
 291   connection_manager_.reset(new SyncAPIServerConnectionManager(
 292       args->service_url.host() + args->service_url.path(),
 293       args->service_url.EffectiveIntPort(),
 294       args->service_url.SchemeIsSecure(),
 295       args->post_factory.release(),
 296       args->cancelation_signal));
 297   connection_manager_->set_client_id(directory()->cache_guid());
 298   connection_manager_->AddListener(this);
 299
 300   std::string sync_id = directory()->cache_guid();
 301
 302   DVLOG(1) << "Setting sync client ID: " << sync_id;
 303   allstatus_.SetSyncId(sync_id);
 304   DVLOG(1) << "Setting invalidator client ID: " << args->invalidator_client_id;
 305   allstatus_.SetInvalidatorClientId(args->invalidator_client_id);
 306
 307   model_type_registry_.reset(
 308       new ModelTypeRegistry(args->workers, directory(), this));
 309   sync_encryption_handler_->AddObserver(model_type_registry_.get());
 310
 311   // Bind the SyncContext WeakPtr to this thread.  This helps us crash earlier
 312   // if the pointer is misused in debug mode.
 313   base::WeakPtr<SyncContext> weak_core = model_type_registry_->AsWeakPtr();
 314   weak_core.get();
 315
 316   sync_context_proxy_.reset(
 317       new SyncContextProxyImpl(base::ThreadTaskRunnerHandle::Get(), weak_core));
 318
 319   // Build a SyncSessionContext and store the worker in it.
 320   DVLOG(1) << "Sync is bringing up SyncSessionContext.";
 321   std::vector<SyncEngineEventListener*> listeners;
 322   listeners.push_back(&allstatus_);
 323   listeners.push_back(this);
 324   session_context_ =
 325       args->internal_components_factory->BuildContext(
 326                                              connection_manager_.get(),
 327                                              directory(),
 328                                              args->extensions_activity,
 329                                              listeners,
 330                                              &debug_info_event_listener_,
 331                                              model_type_registry_.get(),
 332                                              args->invalidator_client_id)
 333           .Pass();
 334   session_context_->set_account_name(args->credentials.email);
 335   scheduler_ = args->internal_components_factory->BuildScheduler(
 336       name_, session_context_.get(), args->cancelation_signal).Pass();
 337
 338   scheduler_->Start(SyncScheduler::CONFIGURATION_MODE);
 339
 340   initialized_ = true;
 341
 342   net::NetworkChangeNotifier::AddIPAddressObserver(this);
 343   net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
 344   observing_network_connectivity_changes_ = true;
 345
 346   UpdateCredentials(args->credentials);
 347
 348   NotifyInitializationSuccess();
 349 }
 350
 351 void SyncManagerImpl::NotifyInitializationSuccess() {
 352   FOR_EACH_OBSERVER(SyncManager::Observer, observers_,
 353                     OnInitializationComplete(
 354                         MakeWeakHandle(weak_ptr_factory_.GetWeakPtr()),
 355                         MakeWeakHandle(debug_info_event_listener_.GetWeakPtr()),
 356                         true, InitialSyncEndedTypes()));
 357 }
 358
 359 void SyncManagerImpl::NotifyInitializationFailure() {
 360   FOR_EACH_OBSERVER(SyncManager::Observer, observers_,
 361                     OnInitializationComplete(
 362                         MakeWeakHandle(weak_ptr_factory_.GetWeakPtr()),
 363                         MakeWeakHandle(debug_info_event_listener_.GetWeakPtr()),
 364                         false, ModelTypeSet()));
 365 }
 366
 367 void SyncManagerImpl::OnPassphraseRequired(
 368     PassphraseRequiredReason reason,
 369     const sync_pb::EncryptedData& pending_keys) {
 370   // Does nothing.
 371 }
 372
 373 void SyncManagerImpl::OnPassphraseAccepted() {
 374   // Does nothing.
 375 }
 376
 377 void SyncManagerImpl::OnBootstrapTokenUpdated(
 378     const std::string& bootstrap_token,
 379     BootstrapTokenType type) {
 380   if (type == KEYSTORE_BOOTSTRAP_TOKEN)
 381     allstatus_.SetHasKeystoreKey(true);
 382 }
 383
 384 void SyncManagerImpl::OnEncryptedTypesChanged(ModelTypeSet encrypted_types,
 385                                               bool encrypt_everything) {
 386   allstatus_.SetEncryptedTypes(encrypted_types);
 387 }
 388
 389 void SyncManagerImpl::OnEncryptionComplete() {
 390   // Does nothing.
 391 }
 392
 393 void SyncManagerImpl::OnCryptographerStateChanged(
 394     Cryptographer* cryptographer) {
 395   allstatus_.SetCryptographerReady(cryptographer->is_ready());
 396   allstatus_.SetCryptoHasPendingKeys(cryptographer->has_pending_keys());
 397   allstatus_.SetKeystoreMigrationTime(
 398       sync_encryption_handler_->migration_time());
 399 }
 400
 401 void SyncManagerImpl::OnPassphraseTypeChanged(
 402     PassphraseType type,
 403     base::Time explicit_passphrase_time) {
 404   allstatus_.SetPassphraseType(type);
 405   allstatus_.SetKeystoreMigrationTime(
 406       sync_encryption_handler_->migration_time());
 407 }
 408
 409 void SyncManagerImpl::StartSyncingNormally(
 410     const ModelSafeRoutingInfo& routing_info) {
 411   // Start the sync scheduler.
 412   // TODO(sync): We always want the newest set of routes when we switch back
 413   // to normal mode. Figure out how to enforce set_routing_info is always
 414   // appropriately set and that it's only modified when switching to normal
 415   // mode.
 416   DCHECK(thread_checker_.CalledOnValidThread());
 417   session_context_->SetRoutingInfo(routing_info);
 418   scheduler_->Start(SyncScheduler::NORMAL_MODE);
 419 }
 420
 421 syncable::Directory* SyncManagerImpl::directory() {
 422   return share_.directory.get();
 423 }
 424
 425 const SyncScheduler* SyncManagerImpl::scheduler() const {
 426   return scheduler_.get();
 427 }
 428
 429 bool SyncManagerImpl::GetHasInvalidAuthTokenForTest() const {
 430   return connection_manager_->HasInvalidAuthToken();
 431 }
 432
 433 bool SyncManagerImpl::OpenDirectory(const std::string& username) {
 434   DCHECK(!initialized_) << "Should only happen once";
 435
 436   // Set before Open().
 437   change_observer_ = MakeWeakHandle(js_mutation_event_observer_.AsWeakPtr());
 438   WeakHandle<syncable::TransactionObserver> transaction_observer(
 439       MakeWeakHandle(js_mutation_event_observer_.AsWeakPtr()));
 440
 441   syncable::DirOpenResult open_result = syncable::NOT_INITIALIZED;
 442   open_result = directory()->Open(username, this, transaction_observer);
 443   if (open_result != syncable::OPENED) {
 444     LOG(ERROR) << "Could not open share for:" << username;
 445     return false;
 446   }
 447
 448   // Unapplied datatypes (those that do not have initial sync ended set) get
 449   // re-downloaded during any configuration. But, it's possible for a datatype
 450   // to have a progress marker but not have initial sync ended yet, making
 451   // it a candidate for migration. This is a problem, as the DataTypeManager
 452   // does not support a migration while it's already in the middle of a
 453   // configuration. As a result, any partially synced datatype can stall the
 454   // DTM, waiting for the configuration to complete, which it never will due
 455   // to the migration error. In addition, a partially synced nigori will
 456   // trigger the migration logic before the backend is initialized, resulting
 457   // in crashes. We therefore detect and purge any partially synced types as
 458   // part of initialization.
 459   if (!PurgePartiallySyncedTypes())
 460     return false;
 461
 462   return true;
 463 }
 464
 465 bool SyncManagerImpl::PurgePartiallySyncedTypes() {
 466   ModelTypeSet partially_synced_types = ModelTypeSet::All();
 467   partially_synced_types.RemoveAll(InitialSyncEndedTypes());
 468   partially_synced_types.RemoveAll(GetTypesWithEmptyProgressMarkerToken(
 469       ModelTypeSet::All()));
 470
 471   DVLOG(1) << "Purging partially synced types "
 472            << ModelTypeSetToString(partially_synced_types);
 473   UMA_HISTOGRAM_COUNTS("Sync.PartiallySyncedTypes",
 474                        partially_synced_types.Size());
 475   if (partially_synced_types.Empty())
 476     return true;
 477   return directory()->PurgeEntriesWithTypeIn(partially_synced_types,
 478                                              ModelTypeSet(),
 479                                              ModelTypeSet());
 480 }
 481
 482 bool SyncManagerImpl::PurgeDisabledTypes(
 483     ModelTypeSet to_purge,
 484     ModelTypeSet to_journal,
 485     ModelTypeSet to_unapply) {
 486   if (to_purge.Empty())
 487     return true;
 488   DVLOG(1) << "Purging disabled types " << ModelTypeSetToString(to_purge);
 489   DCHECK(to_purge.HasAll(to_journal));
 490   DCHECK(to_purge.HasAll(to_unapply));
 491   return directory()->PurgeEntriesWithTypeIn(to_purge, to_journal, to_unapply);
 492 }
 493
 494 void SyncManagerImpl::UpdateCredentials(const SyncCredentials& credentials) {
 495   DCHECK(thread_checker_.CalledOnValidThread());
 496   DCHECK(initialized_);
 497   DCHECK(!credentials.email.empty());
 498   DCHECK(!credentials.sync_token.empty());
 499   DCHECK(!credentials.scope_set.empty());
 500
 501   observing_network_connectivity_changes_ = true;
 502   if (!connection_manager_->SetAuthToken(credentials.sync_token))
 503     return;  // Auth token is known to be invalid, so exit early.
 504
 505   scheduler_->OnCredentialsUpdated();
 506
 507   // TODO(zea): pass the credential age to the debug info event listener.
 508 }
 509
 510 void SyncManagerImpl::AddObserver(SyncManager::Observer* observer) {
 511   DCHECK(thread_checker_.CalledOnValidThread());
 512   observers_.AddObserver(observer);
 513 }
 514
 515 void SyncManagerImpl::RemoveObserver(SyncManager::Observer* observer) {
 516   DCHECK(thread_checker_.CalledOnValidThread());
 517   observers_.RemoveObserver(observer);
 518 }
 519
 520 void SyncManagerImpl::ShutdownOnSyncThread(ShutdownReason reason) {
 521   DCHECK(thread_checker_.CalledOnValidThread());
 522
 523   // Prevent any in-flight method calls from running.  Also
 524   // invalidates |weak_handle_this_| and |change_observer_|.
 525   weak_ptr_factory_.InvalidateWeakPtrs();
 526   js_mutation_event_observer_.InvalidateWeakPtrs();
 527
 528   scheduler_.reset();
 529   session_context_.reset();
 530
 531   if (model_type_registry_)
 532     sync_encryption_handler_->RemoveObserver(model_type_registry_.get());
 533
 534   model_type_registry_.reset();
 535
 536   if (sync_encryption_handler_) {
 537     sync_encryption_handler_->RemoveObserver(&debug_info_event_listener_);
 538     sync_encryption_handler_->RemoveObserver(this);
 539   }
 540
 541   SetJsEventHandler(WeakHandle<JsEventHandler>());
 542   RemoveObserver(&js_sync_manager_observer_);
 543
 544   RemoveObserver(&debug_info_event_listener_);
 545
 546   // |connection_manager_| may end up being NULL here in tests (in synchronous
 547   // initialization mode).
 548   //
 549   // TODO(akalin): Fix this behavior.
 550   if (connection_manager_)
 551     connection_manager_->RemoveListener(this);
 552   connection_manager_.reset();
 553
 554   net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
 555   net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
 556   observing_network_connectivity_changes_ = false;
 557
 558   if (initialized_ && directory()) {
 559     directory()->SaveChanges();
 560   }
 561
 562   share_.directory.reset();
 563
 564   change_delegate_ = NULL;
 565
 566   initialized_ = false;
 567
 568   // We reset these here, since only now we know they will not be
 569   // accessed from other threads (since we shut down everything).
 570   change_observer_.Reset();
 571   weak_handle_this_.Reset();
 572 }
 573
 574 void SyncManagerImpl::OnIPAddressChanged() {
 575   if (!observing_network_connectivity_changes_) {
 576     DVLOG(1) << "IP address change dropped.";
 577     return;
 578   }
 579   DVLOG(1) << "IP address change detected.";
 580   OnNetworkConnectivityChangedImpl();
 581 }
 582
 583 void SyncManagerImpl::OnConnectionTypeChanged(
 584   net::NetworkChangeNotifier::ConnectionType) {
 585   if (!observing_network_connectivity_changes_) {
 586     DVLOG(1) << "Connection type change dropped.";
 587     return;
 588   }
 589   DVLOG(1) << "Connection type change detected.";
 590   OnNetworkConnectivityChangedImpl();
 591 }
 592
 593 void SyncManagerImpl::OnNetworkConnectivityChangedImpl() {
 594   DCHECK(thread_checker_.CalledOnValidThread());
 595   scheduler_->OnConnectionStatusChange();
 596 }
 597
 598 void SyncManagerImpl::OnServerConnectionEvent(
 599     const ServerConnectionEvent& event) {
 600   DCHECK(thread_checker_.CalledOnValidThread());
 601   if (event.connection_code ==
 602       HttpResponse::SERVER_CONNECTION_OK) {
 603     FOR_EACH_OBSERVER(SyncManager::Observer, observers_,
 604                       OnConnectionStatusChange(CONNECTION_OK));
 605   }
 606
 607   if (event.connection_code == HttpResponse::SYNC_AUTH_ERROR) {
 608     observing_network_connectivity_changes_ = false;
 609     FOR_EACH_OBSERVER(SyncManager::Observer, observers_,
 610                       OnConnectionStatusChange(CONNECTION_AUTH_ERROR));
 611   }
 612
 613   if (event.connection_code == HttpResponse::SYNC_SERVER_ERROR) {
 614     FOR_EACH_OBSERVER(SyncManager::Observer, observers_,
 615                       OnConnectionStatusChange(CONNECTION_SERVER_ERROR));
 616   }
 617 }
 618
 619 void SyncManagerImpl::HandleTransactionCompleteChangeEvent(
 620     ModelTypeSet models_with_changes) {
 621   // This notification happens immediately after the transaction mutex is
 622   // released. This allows work to be performed without blocking other threads
 623   // from acquiring a transaction.
 624   if (!change_delegate_)
 625     return;
 626
 627   // Call commit.
 628   for (ModelTypeSet::Iterator it = models_with_changes.First();
 629        it.Good(); it.Inc()) {
 630     change_delegate_->OnChangesComplete(it.Get());
 631     change_observer_.Call(
 632         FROM_HERE,
 633         &SyncManager::ChangeObserver::OnChangesComplete,
 634         it.Get());
 635   }
 636 }
 637
 638 ModelTypeSet
 639 SyncManagerImpl::HandleTransactionEndingChangeEvent(
 640     const ImmutableWriteTransactionInfo& write_transaction_info,
 641     syncable::BaseTransaction* trans) {
 642   // This notification happens immediately before a syncable WriteTransaction
 643   // falls out of scope. It happens while the channel mutex is still held,
 644   // and while the transaction mutex is held, so it cannot be re-entrant.
 645   if (!change_delegate_ || change_records_.empty())
 646     return ModelTypeSet();
 647
 648   // This will continue the WriteTransaction using a read only wrapper.
 649   // This is the last chance for read to occur in the WriteTransaction
 650   // that's closing. This special ReadTransaction will not close the
 651   // underlying transaction.
 652   ReadTransaction read_trans(GetUserShare(), trans);
 653
 654   ModelTypeSet models_with_changes;
 655   for (ChangeRecordMap::const_iterator it = change_records_.begin();
 656       it != change_records_.end(); ++it) {
 657     DCHECK(!it->second.Get().empty());
 658     ModelType type = ModelTypeFromInt(it->first);
 659     change_delegate_->
 660         OnChangesApplied(type, trans->directory()->GetTransactionVersion(type),
 661                          &read_trans, it->second);
 662     change_observer_.Call(FROM_HERE,
 663         &SyncManager::ChangeObserver::OnChangesApplied,
 664         type, write_transaction_info.Get().id, it->second);
 665     models_with_changes.Put(type);
 666   }
 667   change_records_.clear();
 668   return models_with_changes;
 669 }
 670
 671 void SyncManagerImpl::HandleCalculateChangesChangeEventFromSyncApi(
 672     const ImmutableWriteTransactionInfo& write_transaction_info,
 673     syncable::BaseTransaction* trans,
 674     std::vector<int64>* entries_changed) {
 675   // We have been notified about a user action changing a sync model.
 676   LOG_IF(WARNING, !change_records_.empty()) <<
 677       "CALCULATE_CHANGES called with unapplied old changes.";
 678
 679   // The mutated model type, or UNSPECIFIED if nothing was mutated.
 680   ModelTypeSet mutated_model_types;
 681
 682   const syncable::ImmutableEntryKernelMutationMap& mutations =
 683       write_transaction_info.Get().mutations;
 684   for (syncable::EntryKernelMutationMap::const_iterator it =
 685            mutations.Get().begin(); it != mutations.Get().end(); ++it) {
 686     if (!it->second.mutated.ref(syncable::IS_UNSYNCED)) {
 687       continue;
 688     }
 689
 690     ModelType model_type =
 691         GetModelTypeFromSpecifics(it->second.mutated.ref(SPECIFICS));
 692     if (model_type < FIRST_REAL_MODEL_TYPE) {
 693       NOTREACHED() << "Permanent or underspecified item changed via syncapi.";
 694       continue;
 695     }
 696
 697     // Found real mutation.
 698     if (model_type != UNSPECIFIED) {
 699       mutated_model_types.Put(model_type);
 700       entries_changed->push_back(it->second.mutated.ref(syncable::META_HANDLE));
 701     }
 702   }
 703
 704   // Nudge if necessary.
 705   if (!mutated_model_types.Empty()) {
 706     if (weak_handle_this_.IsInitialized()) {
 707       weak_handle_this_.Call(FROM_HERE,
 708                              &SyncManagerImpl::RequestNudgeForDataTypes,
 709                              FROM_HERE,
 710                              mutated_model_types);
 711     } else {
 712       NOTREACHED();
 713     }
 714   }
 715 }
 716
 717 void SyncManagerImpl::SetExtraChangeRecordData(int64 id,
 718     ModelType type, ChangeReorderBuffer* buffer,
 719     Cryptographer* cryptographer, const syncable::EntryKernel& original,
 720     bool existed_before, bool exists_now) {
 721   // If this is a deletion and the datatype was encrypted, we need to decrypt it
 722   // and attach it to the buffer.
 723   if (!exists_now && existed_before) {
 724     sync_pb::EntitySpecifics original_specifics(original.ref(SPECIFICS));
 725     if (type == PASSWORDS) {
 726       // Passwords must use their own legacy ExtraPasswordChangeRecordData.
 727       scoped_ptr<sync_pb::PasswordSpecificsData> data(
 728           DecryptPasswordSpecifics(original_specifics, cryptographer));
 729       if (!data) {
 730         NOTREACHED();
 731         return;
 732       }
 733       buffer->SetExtraDataForId(id, new ExtraPasswordChangeRecordData(*data));
 734     } else if (original_specifics.has_encrypted()) {
 735       // All other datatypes can just create a new unencrypted specifics and
 736       // attach it.
 737       const sync_pb::EncryptedData& encrypted = original_specifics.encrypted();
 738       if (!cryptographer->Decrypt(encrypted, &original_specifics)) {
 739         NOTREACHED();
 740         return;
 741       }
 742     }
 743     buffer->SetSpecificsForId(id, original_specifics);
 744   }
 745 }
 746
 747 void SyncManagerImpl::HandleCalculateChangesChangeEventFromSyncer(
 748     const ImmutableWriteTransactionInfo& write_transaction_info,
 749     syncable::BaseTransaction* trans,
 750     std::vector<int64>* entries_changed) {
 751   // We only expect one notification per sync step, so change_buffers_ should
 752   // contain no pending entries.
 753   LOG_IF(WARNING, !change_records_.empty()) <<
 754       "CALCULATE_CHANGES called with unapplied old changes.";
 755
 756   ChangeReorderBuffer change_buffers[MODEL_TYPE_COUNT];
 757
 758   Cryptographer* crypto = directory()->GetCryptographer(trans);
 759   const syncable::ImmutableEntryKernelMutationMap& mutations =
 760       write_transaction_info.Get().mutations;
 761   for (syncable::EntryKernelMutationMap::const_iterator it =
 762            mutations.Get().begin(); it != mutations.Get().end(); ++it) {
 763     bool existed_before = !it->second.original.ref(syncable::IS_DEL);
 764     bool exists_now = !it->second.mutated.ref(syncable::IS_DEL);
 765
 766     // Omit items that aren't associated with a model.
 767     ModelType type =
 768         GetModelTypeFromSpecifics(it->second.mutated.ref(SPECIFICS));
 769     if (type < FIRST_REAL_MODEL_TYPE)
 770       continue;
 771
 772     int64 handle = it->first;
 773     if (exists_now && !existed_before)
 774       change_buffers[type].PushAddedItem(handle);
 775     else if (!exists_now && existed_before)
 776       change_buffers[type].PushDeletedItem(handle);
 777     else if (exists_now && existed_before &&
 778              VisiblePropertiesDiffer(it->second, crypto)) {
 779       change_buffers[type].PushUpdatedItem(handle);
 780     }
 781
 782     SetExtraChangeRecordData(handle, type, &change_buffers[type], crypto,
 783                              it->second.original, existed_before, exists_now);
 784   }
 785
 786   ReadTransaction read_trans(GetUserShare(), trans);
 787   for (int i = FIRST_REAL_MODEL_TYPE; i < MODEL_TYPE_COUNT; ++i) {
 788     if (!change_buffers[i].IsEmpty()) {
 789       if (change_buffers[i].GetAllChangesInTreeOrder(&read_trans,
 790                                                      &(change_records_[i]))) {
 791         for (size_t j = 0; j < change_records_[i].Get().size(); ++j)
 792           entries_changed->push_back((change_records_[i].Get())[j].id);
 793       }
 794       if (change_records_[i].Get().empty())
 795         change_records_.erase(i);
 796     }
 797   }
 798 }
 799
 800 void SyncManagerImpl::RequestNudgeForDataTypes(
 801     const tracked_objects::Location& nudge_location,
 802     ModelTypeSet types) {
 803   debug_info_event_listener_.OnNudgeFromDatatype(types.First().Get());
 804
 805   scheduler_->ScheduleLocalNudge(types, nudge_location);
 806 }
 807
 808 void SyncManagerImpl::NudgeForInitialDownload(syncer::ModelType type) {
 809   DCHECK(thread_checker_.CalledOnValidThread());
 810   scheduler_->ScheduleInitialSyncNudge(type);
 811 }
 812
 813 void SyncManagerImpl::NudgeForCommit(syncer::ModelType type) {
 814   DCHECK(thread_checker_.CalledOnValidThread());
 815   RequestNudgeForDataTypes(FROM_HERE, ModelTypeSet(type));
 816 }
 817
 818 void SyncManagerImpl::NudgeForRefresh(syncer::ModelType type) {
 819   DCHECK(thread_checker_.CalledOnValidThread());
 820   RefreshTypes(ModelTypeSet(type));
 821 }
 822
 823 void SyncManagerImpl::OnSyncCycleEvent(const SyncCycleEvent& event) {
 824   DCHECK(thread_checker_.CalledOnValidThread());
 825   // Only send an event if this is due to a cycle ending and this cycle
 826   // concludes a canonical "sync" process; that is, based on what is known
 827   // locally we are "all happy" and up-to-date.  There may be new changes on
 828   // the server, but we'll get them on a subsequent sync.
 829   //
 830   // Notifications are sent at the end of every sync cycle, regardless of
 831   // whether we should sync again.
 832   if (event.what_happened == SyncCycleEvent::SYNC_CYCLE_ENDED) {
 833     if (!initialized_) {
 834       DVLOG(1) << "OnSyncCycleCompleted not sent because sync api is not "
 835                << "initialized";
 836       return;
 837     }
 838
 839     DVLOG(1) << "Sending OnSyncCycleCompleted";
 840     FOR_EACH_OBSERVER(SyncManager::Observer, observers_,
 841                       OnSyncCycleCompleted(event.snapshot));
 842   }
 843 }
 844
 845 void SyncManagerImpl::OnActionableError(const SyncProtocolError& error) {
 846   FOR_EACH_OBSERVER(
 847       SyncManager::Observer, observers_,
 848       OnActionableError(error));
 849 }
 850
 851 void SyncManagerImpl::OnRetryTimeChanged(base::Time) {}
 852
 853 void SyncManagerImpl::OnThrottledTypesChanged(ModelTypeSet) {}
 854
 855 void SyncManagerImpl::OnMigrationRequested(ModelTypeSet types) {
 856   FOR_EACH_OBSERVER(
 857       SyncManager::Observer, observers_,
 858       OnMigrationRequested(types));
 859 }
 860
 861 void SyncManagerImpl::OnProtocolEvent(const ProtocolEvent& event) {
 862   protocol_event_buffer_.RecordProtocolEvent(event);
 863   FOR_EACH_OBSERVER(SyncManager::Observer, observers_,
 864                     OnProtocolEvent(event));
 865 }
 866
 867 void SyncManagerImpl::SetJsEventHandler(
 868     const WeakHandle<JsEventHandler>& event_handler) {
 869   js_sync_manager_observer_.SetJsEventHandler(event_handler);
 870   js_mutation_event_observer_.SetJsEventHandler(event_handler);
 871   js_sync_encryption_handler_observer_.SetJsEventHandler(event_handler);
 872 }
 873
 874 scoped_ptr<base::ListValue> SyncManagerImpl::GetAllNodesForType(
 875     syncer::ModelType type) {
 876   DirectoryTypeDebugInfoEmitterMap* emitter_map =
 877       model_type_registry_->directory_type_debug_info_emitter_map();
 878   DirectoryTypeDebugInfoEmitterMap::iterator it = emitter_map->find(type);
 879
 880   if (it == emitter_map->end()) {
 881     // This can happen in some cases.  The UI thread makes requests of us
 882     // when it doesn't really know which types are enabled or disabled.
 883     DLOG(WARNING) << "Asked to return debug info for invalid type "
 884                   << ModelTypeToString(type);
 885     return scoped_ptr<base::ListValue>(new base::ListValue());
 886   }
 887
 888   return it->second->GetAllNodes();
 889 }
 890
 891 void SyncManagerImpl::SetInvalidatorEnabled(bool invalidator_enabled) {
 892   DCHECK(thread_checker_.CalledOnValidThread());
 893
 894   DVLOG(1) << "Invalidator enabled state is now: " << invalidator_enabled;
 895   allstatus_.SetNotificationsEnabled(invalidator_enabled);
 896   scheduler_->SetNotificationsEnabled(invalidator_enabled);
 897 }
 898
 899 void SyncManagerImpl::OnIncomingInvalidation(
 900     syncer::ModelType type,
 901     scoped_ptr<InvalidationInterface> invalidation) {
 902   DCHECK(thread_checker_.CalledOnValidThread());
 903
 904   scheduler_->ScheduleInvalidationNudge(
 905       type,
 906       invalidation.Pass(),
 907       FROM_HERE);
 908 }
 909
 910 void SyncManagerImpl::RefreshTypes(ModelTypeSet types) {
 911   DCHECK(thread_checker_.CalledOnValidThread());
 912   if (types.Empty()) {
 913     LOG(WARNING) << "Sync received refresh request with no types specified.";
 914   } else {
 915     scheduler_->ScheduleLocalRefreshRequest(
 916         types, FROM_HERE);
 917   }
 918 }
 919
 920 SyncStatus SyncManagerImpl::GetDetailedStatus() const {
 921   return allstatus_.status();
 922 }
 923
 924 void SyncManagerImpl::SaveChanges() {
 925   directory()->SaveChanges();
 926 }
 927
 928 UserShare* SyncManagerImpl::GetUserShare() {
 929   DCHECK(initialized_);
 930   return &share_;
 931 }
 932
 933 syncer::SyncContextProxy* SyncManagerImpl::GetSyncContextProxy() {
 934   DCHECK(initialized_);
 935   return sync_context_proxy_.get();
 936 }
 937
 938 const std::string SyncManagerImpl::cache_guid() {
 939   DCHECK(initialized_);
 940   return directory()->cache_guid();
 941 }
 942
 943 bool SyncManagerImpl::ReceivedExperiment(Experiments* experiments) {
 944   ReadTransaction trans(FROM_HERE, GetUserShare());
 945   ReadNode nigori_node(&trans);
 946   if (nigori_node.InitTypeRoot(NIGORI) != BaseNode::INIT_OK) {
 947     DVLOG(1) << "Couldn't find Nigori node.";
 948     return false;
 949   }
 950   bool found_experiment = false;
 951
 952   ReadNode favicon_sync_node(&trans);
 953   if (favicon_sync_node.InitByClientTagLookup(
 954           syncer::EXPERIMENTS,
 955           syncer::kFaviconSyncTag) == BaseNode::INIT_OK) {
 956     experiments->favicon_sync_limit =
 957         favicon_sync_node.GetExperimentsSpecifics().favicon_sync().
 958             favicon_sync_limit();
 959     found_experiment = true;
 960   }
 961
 962   ReadNode pre_commit_update_avoidance_node(&trans);
 963   if (pre_commit_update_avoidance_node.InitByClientTagLookup(
 964           syncer::EXPERIMENTS,
 965           syncer::kPreCommitUpdateAvoidanceTag) == BaseNode::INIT_OK) {
 966     session_context_->set_server_enabled_pre_commit_update_avoidance(
 967         pre_commit_update_avoidance_node.GetExperimentsSpecifics().
 968             pre_commit_update_avoidance().enabled());
 969     // We don't bother setting found_experiment.  The frontend doesn't need to
 970     // know about this.
 971   }
 972
 973   ReadNode gcm_channel_node(&trans);
 974   if (gcm_channel_node.InitByClientTagLookup(
 975           syncer::EXPERIMENTS,
 976           syncer::kGCMChannelTag) == BaseNode::INIT_OK &&
 977       gcm_channel_node.GetExperimentsSpecifics().gcm_channel().has_enabled()) {
 978     experiments->gcm_channel_state =
 979         (gcm_channel_node.GetExperimentsSpecifics().gcm_channel().enabled() ?
 980          syncer::Experiments::ENABLED : syncer::Experiments::SUPPRESSED);
 981     found_experiment = true;
 982   }
 983
 984   ReadNode enhanced_bookmarks_node(&trans);
 985   if (enhanced_bookmarks_node.InitByClientTagLookup(
 986           syncer::EXPERIMENTS, syncer::kEnhancedBookmarksTag) ==
 987           BaseNode::INIT_OK &&
 988       enhanced_bookmarks_node.GetExperimentsSpecifics()
 989           .has_enhanced_bookmarks()) {
 990     const sync_pb::EnhancedBookmarksFlags& enhanced_bookmarks =
 991         enhanced_bookmarks_node.GetExperimentsSpecifics().enhanced_bookmarks();
 992     if (enhanced_bookmarks.has_enabled())
 993       experiments->enhanced_bookmarks_enabled = enhanced_bookmarks.enabled();
 994     if (enhanced_bookmarks.has_extension_id()) {
 995       experiments->enhanced_bookmarks_ext_id =
 996           enhanced_bookmarks.extension_id();
 997     }
 998     found_experiment = true;
 999   }
1000
1001   ReadNode gcm_invalidations_node(&trans);
1002   if (gcm_invalidations_node.InitByClientTagLookup(
1003           syncer::EXPERIMENTS, syncer::kGCMInvalidationsTag) ==
1004       BaseNode::INIT_OK) {
1005     const sync_pb::GcmInvalidationsFlags& gcm_invalidations =
1006         gcm_invalidations_node.GetExperimentsSpecifics().gcm_invalidations();
1007     if (gcm_invalidations.has_enabled()) {
1008       experiments->gcm_invalidations_enabled = gcm_invalidations.enabled();
1009       found_experiment = true;
1010     }
1011   }
1012
1013   return found_experiment;
1014 }
1015
1016 bool SyncManagerImpl::HasUnsyncedItems() {
1017   ReadTransaction trans(FROM_HERE, GetUserShare());
1018   return (trans.GetWrappedTrans()->directory()->unsynced_entity_count() != 0);
1019 }
1020
1021 SyncEncryptionHandler* SyncManagerImpl::GetEncryptionHandler() {
1022   return sync_encryption_handler_.get();
1023 }
1024
1025 ScopedVector<syncer::ProtocolEvent>
1026     SyncManagerImpl::GetBufferedProtocolEvents() {
1027   return protocol_event_buffer_.GetBufferedProtocolEvents();
1028 }
1029
1030 void SyncManagerImpl::RegisterDirectoryTypeDebugInfoObserver(
1031     syncer::TypeDebugInfoObserver* observer) {
1032   model_type_registry_->RegisterDirectoryTypeDebugInfoObserver(observer);
1033 }
1034
1035 void SyncManagerImpl::UnregisterDirectoryTypeDebugInfoObserver(
1036     syncer::TypeDebugInfoObserver* observer) {
1037   model_type_registry_->UnregisterDirectoryTypeDebugInfoObserver(observer);
1038 }
1039
1040 bool SyncManagerImpl::HasDirectoryTypeDebugInfoObserver(
1041     syncer::TypeDebugInfoObserver* observer) {
1042   return model_type_registry_->HasDirectoryTypeDebugInfoObserver(observer);
1043 }
1044
1045 void SyncManagerImpl::RequestEmitDebugInfo() {
1046   model_type_registry_->RequestEmitDebugInfo();
1047 }
1048
1049 }  // namespace syncer