| // 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 "sync/engine/directory_update_handler.h" |
| |
| #include "sync/engine/conflict_resolver.h" |
| #include "sync/engine/process_updates_util.h" |
| #include "sync/engine/update_applicator.h" |
| #include "sync/sessions/directory_type_debug_info_emitter.h" |
| #include "sync/syncable/directory.h" |
| #include "sync/syncable/syncable_model_neutral_write_transaction.h" |
| #include "sync/syncable/syncable_write_transaction.h" |
| |
| namespace syncer { |
| |
| using syncable::SYNCER; |
| |
| DirectoryUpdateHandler::DirectoryUpdateHandler( |
| syncable::Directory* dir, |
| ModelType type, |
| scoped_refptr<ModelSafeWorker> worker, |
| DirectoryTypeDebugInfoEmitter* debug_info_emitter) |
| : dir_(dir), |
| type_(type), |
| worker_(worker), |
| debug_info_emitter_(debug_info_emitter) {} |
| |
| DirectoryUpdateHandler::~DirectoryUpdateHandler() {} |
| |
| void DirectoryUpdateHandler::GetDownloadProgress( |
| sync_pb::DataTypeProgressMarker* progress_marker) const { |
| dir_->GetDownloadProgress(type_, progress_marker); |
| } |
| |
| void DirectoryUpdateHandler::GetDataTypeContext( |
| sync_pb::DataTypeContext* context) const { |
| syncable::ModelNeutralWriteTransaction trans(FROM_HERE, SYNCER, dir_); |
| dir_->GetDataTypeContext(&trans, type_, context); |
| } |
| |
| SyncerError DirectoryUpdateHandler::ProcessGetUpdatesResponse( |
| const sync_pb::DataTypeProgressMarker& progress_marker, |
| const sync_pb::DataTypeContext& mutated_context, |
| const SyncEntityList& applicable_updates, |
| sessions::StatusController* status) { |
| syncable::ModelNeutralWriteTransaction trans(FROM_HERE, SYNCER, dir_); |
| if (mutated_context.has_context()) { |
| sync_pb::DataTypeContext local_context; |
| dir_->GetDataTypeContext(&trans, type_, &local_context); |
| |
| // Only update the local context if it is still relevant. If the local |
| // version is higher, it means a local change happened while the mutation |
| // was in flight, and the local context takes priority. |
| if (mutated_context.version() >= local_context.version() && |
| local_context.context() != mutated_context.context()) { |
| dir_->SetDataTypeContext(&trans, type_, mutated_context); |
| // TODO(zea): trigger the datatype's UpdateDataTypeContext method. |
| } else if (mutated_context.version() < local_context.version()) { |
| // A GetUpdates using the old context was in progress when the context was |
| // set. Fail this get updates cycle, to force a retry. |
| DVLOG(1) << "GU Context conflict detected, forcing GU retry."; |
| debug_info_emitter_->EmitUpdateCountersUpdate(); |
| return DATATYPE_TRIGGERED_RETRY; |
| } |
| } |
| |
| UpdateSyncEntities(&trans, applicable_updates, status); |
| |
| if (IsValidProgressMarker(progress_marker)) { |
| ExpireEntriesIfNeeded(&trans, progress_marker); |
| UpdateProgressMarker(progress_marker); |
| } |
| debug_info_emitter_->EmitUpdateCountersUpdate(); |
| return SYNCER_OK; |
| } |
| |
| void DirectoryUpdateHandler::ApplyUpdates(sessions::StatusController* status) { |
| if (!IsApplyUpdatesRequired()) { |
| return; |
| } |
| |
| // This will invoke handlers that belong to the model and its thread, so we |
| // switch to the appropriate thread before we start this work. |
| WorkCallback c = base::Bind( |
| &DirectoryUpdateHandler::ApplyUpdatesImpl, |
| // We wait until the callback is executed. We can safely use Unretained. |
| base::Unretained(this), |
| base::Unretained(status)); |
| worker_->DoWorkAndWaitUntilDone(c); |
| |
| debug_info_emitter_->EmitUpdateCountersUpdate(); |
| debug_info_emitter_->EmitStatusCountersUpdate(); |
| } |
| |
| void DirectoryUpdateHandler::PassiveApplyUpdates( |
| sessions::StatusController* status) { |
| if (!IsApplyUpdatesRequired()) { |
| return; |
| } |
| |
| // Just do the work here instead of deferring to another thread. |
| ApplyUpdatesImpl(status); |
| |
| debug_info_emitter_->EmitUpdateCountersUpdate(); |
| debug_info_emitter_->EmitStatusCountersUpdate(); |
| } |
| |
| SyncerError DirectoryUpdateHandler::ApplyUpdatesImpl( |
| sessions::StatusController* status) { |
| syncable::WriteTransaction trans(FROM_HERE, syncable::SYNCER, dir_); |
| |
| std::vector<int64> handles; |
| dir_->GetUnappliedUpdateMetaHandles( |
| &trans, |
| FullModelTypeSet(type_), |
| &handles); |
| |
| // First set of update application passes. |
| UpdateApplicator applicator(dir_->GetCryptographer(&trans)); |
| applicator.AttemptApplications(&trans, handles); |
| |
| // The old StatusController counters. |
| status->increment_num_updates_applied_by(applicator.updates_applied()); |
| status->increment_num_hierarchy_conflicts_by( |
| applicator.hierarchy_conflicts()); |
| status->increment_num_encryption_conflicts_by( |
| applicator.encryption_conflicts()); |
| |
| // The new UpdateCounter counters. |
| UpdateCounters* counters = debug_info_emitter_->GetMutableUpdateCounters(); |
| counters->num_updates_applied += applicator.updates_applied(); |
| counters->num_hierarchy_conflict_application_failures = |
| applicator.hierarchy_conflicts(); |
| counters->num_encryption_conflict_application_failures += |
| applicator.encryption_conflicts(); |
| |
| if (applicator.simple_conflict_ids().size() != 0) { |
| // Resolve the simple conflicts we just detected. |
| ConflictResolver resolver; |
| resolver.ResolveConflicts(&trans, |
| dir_->GetCryptographer(&trans), |
| applicator.simple_conflict_ids(), |
| status, |
| counters); |
| |
| // Conflict resolution sometimes results in more updates to apply. |
| handles.clear(); |
| dir_->GetUnappliedUpdateMetaHandles( |
| &trans, |
| FullModelTypeSet(type_), |
| &handles); |
| |
| UpdateApplicator conflict_applicator(dir_->GetCryptographer(&trans)); |
| conflict_applicator.AttemptApplications(&trans, handles); |
| |
| // We count the number of updates from both applicator passes. |
| status->increment_num_updates_applied_by( |
| conflict_applicator.updates_applied()); |
| counters->num_updates_applied += conflict_applicator.updates_applied(); |
| |
| // Encryption conflicts should remain unchanged by the resolution of simple |
| // conflicts. Those can only be solved by updating our nigori key bag. |
| DCHECK_EQ(conflict_applicator.encryption_conflicts(), |
| applicator.encryption_conflicts()); |
| |
| // Hierarchy conflicts should also remain unchanged, for reasons that are |
| // more subtle. Hierarchy conflicts exist when the application of a pending |
| // update from the server would make the local folder hierarchy |
| // inconsistent. The resolution of simple conflicts could never affect the |
| // hierarchy conflicting item directly, because hierarchy conflicts are not |
| // processed by the conflict resolver. It could, in theory, modify the |
| // local hierarchy on which hierarchy conflict detection depends. However, |
| // the conflict resolution algorithm currently in use does not allow this. |
| DCHECK_EQ(conflict_applicator.hierarchy_conflicts(), |
| applicator.hierarchy_conflicts()); |
| |
| // There should be no simple conflicts remaining. We know this because the |
| // resolver should have resolved all the conflicts we detected last time |
| // and, by the two previous assertions, that no conflicts have been |
| // downgraded from encryption or hierarchy down to simple. |
| DCHECK(conflict_applicator.simple_conflict_ids().empty()); |
| } |
| |
| return SYNCER_OK; |
| } |
| |
| bool DirectoryUpdateHandler::IsApplyUpdatesRequired() { |
| if (IsControlType(type_)) { |
| return false; // We don't process control types here. |
| } |
| |
| return dir_->TypeHasUnappliedUpdates(type_); |
| } |
| |
| void DirectoryUpdateHandler::UpdateSyncEntities( |
| syncable::ModelNeutralWriteTransaction* trans, |
| const SyncEntityList& applicable_updates, |
| sessions::StatusController* status) { |
| UpdateCounters* counters = debug_info_emitter_->GetMutableUpdateCounters(); |
| counters->num_updates_received += applicable_updates.size(); |
| ProcessDownloadedUpdates(dir_, trans, type_, |
| applicable_updates, status, counters); |
| } |
| |
| bool DirectoryUpdateHandler::IsValidProgressMarker( |
| const sync_pb::DataTypeProgressMarker& progress_marker) const { |
| int field_number = progress_marker.data_type_id(); |
| ModelType model_type = GetModelTypeFromSpecificsFieldNumber(field_number); |
| if (!IsRealDataType(model_type) || type_ != model_type) { |
| NOTREACHED() |
| << "Update handler of type " << ModelTypeToString(type_) |
| << " asked to process progress marker with invalid type " |
| << field_number; |
| return false; |
| } |
| return true; |
| } |
| |
| void DirectoryUpdateHandler::UpdateProgressMarker( |
| const sync_pb::DataTypeProgressMarker& progress_marker) { |
| if (progress_marker.has_gc_directive() || !cached_gc_directive_) { |
| dir_->SetDownloadProgress(type_, progress_marker); |
| } else { |
| sync_pb::DataTypeProgressMarker merged_marker = progress_marker; |
| merged_marker.mutable_gc_directive()->CopyFrom(*cached_gc_directive_); |
| dir_->SetDownloadProgress(type_, merged_marker); |
| } |
| } |
| |
| void DirectoryUpdateHandler::ExpireEntriesIfNeeded( |
| syncable::ModelNeutralWriteTransaction* trans, |
| const sync_pb::DataTypeProgressMarker& progress_marker) { |
| if (!cached_gc_directive_) { |
| sync_pb::DataTypeProgressMarker current_marker; |
| GetDownloadProgress(¤t_marker); |
| if (current_marker.has_gc_directive()) { |
| cached_gc_directive_.reset(new sync_pb::GarbageCollectionDirective( |
| current_marker.gc_directive())); |
| } |
| } |
| |
| if (!progress_marker.has_gc_directive()) |
| return; |
| |
| const sync_pb::GarbageCollectionDirective& new_gc_directive = |
| progress_marker.gc_directive(); |
| |
| if (new_gc_directive.has_version_watermark() && |
| (!cached_gc_directive_ || |
| cached_gc_directive_->version_watermark() < |
| new_gc_directive.version_watermark())) { |
| ExpireEntriesByVersion(dir_, trans, type_, |
| new_gc_directive.version_watermark()); |
| } |
| |
| cached_gc_directive_.reset( |
| new sync_pb::GarbageCollectionDirective(new_gc_directive)); |
| } |
| |
| } // namespace syncer |