Add sync manager classes for backup/rollback:

* SyncBackupManager runs before first-sync to save local data in backup DB.
* SyncRollbackManager deletes local data that's not found in backup DB.

BUG=362679

Review URL: https://codereview.chromium.org/235053006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@265027 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 112 insertions, 0 deletions

diff --git a/sync/internal_api/sync_backup_manager.cc b/sync/internal_api/sync_backup_manager.cc
new file mode 100644
index 0000000..f255ae6
--- /dev/null
+++ b/sync/internal_api/sync_backup_manager.cc
@@ -0,0 +1,112 @@
+// 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/internal_api/sync_backup_manager.h"
+
+#include "sync/internal_api/public/write_transaction.h"
+#include "sync/syncable/directory.h"
+#include "sync/syncable/mutable_entry.h"
+
+namespace syncer {
+
+SyncBackupManager::SyncBackupManager()
+    : in_normalization_(false) {
+}
+
+SyncBackupManager::~SyncBackupManager() {
+}
+
+void SyncBackupManager::Init(
+      const base::FilePath& database_location,
+      const WeakHandle<JsEventHandler>& event_handler,
+      const std::string& sync_server_and_path,
+      int sync_server_port,
+      bool use_ssl,
+      scoped_ptr<HttpPostProviderFactory> post_factory,
+      const std::vector<scoped_refptr<ModelSafeWorker> >& workers,
+      ExtensionsActivity* extensions_activity,
+      SyncManager::ChangeDelegate* change_delegate,
+      const SyncCredentials& credentials,
+      const std::string& invalidator_client_id,
+      const std::string& restored_key_for_bootstrapping,
+      const std::string& restored_keystore_key_for_bootstrapping,
+      InternalComponentsFactory* internal_components_factory,
+      Encryptor* encryptor,
+      scoped_ptr<UnrecoverableErrorHandler> unrecoverable_error_handler,
+      ReportUnrecoverableErrorFunction
+          report_unrecoverable_error_function,
+      CancelationSignal* cancelation_signal) {
+  SyncRollbackManagerBase::Init(database_location, event_handler,
+                                sync_server_and_path, sync_server_port,
+                                use_ssl, post_factory.Pass(),
+                                workers, extensions_activity, change_delegate,
+                                credentials, invalidator_client_id,
+                                restored_key_for_bootstrapping,
+                                restored_keystore_key_for_bootstrapping,
+                                internal_components_factory, encryptor,
+                                unrecoverable_error_handler.Pass(),
+                                report_unrecoverable_error_function,
+                                cancelation_signal);
+
+  GetUserShare()->directory->CollectMetaHandleCounts(
+      &status_.num_entries_by_type,
+      &status_.num_to_delete_entries_by_type);
+}
+
+void SyncBackupManager::SaveChanges() {
+  NormalizeEntries();
+  GetUserShare()->directory->SaveChanges();
+}
+
+SyncStatus SyncBackupManager::GetDetailedStatus() const {
+  return status_;
+}
+
+ModelTypeSet SyncBackupManager::HandleTransactionEndingChangeEvent(
+    const syncable::ImmutableWriteTransactionInfo& write_transaction_info,
+    syncable::BaseTransaction* trans) {
+  ModelTypeSet types;
+  if (in_normalization_) {
+    // Skip if in our own WriteTransaction from NormalizeEntries().
+    in_normalization_ = false;
+    return types;
+  }
+
+  for (syncable::EntryKernelMutationMap::const_iterator it =
+      write_transaction_info.Get().mutations.Get().begin();
+      it != write_transaction_info.Get().mutations.Get().end(); ++it) {
+    int64 id = it->first;
+    if (unsynced_.find(id) == unsynced_.end()) {
+      unsynced_.insert(id);
+
+      const syncable::EntryKernel& e = it->second.mutated;
+      ModelType type = e.GetModelType();
+      types.Put(type);
+      if (!e.ref(syncable::ID).ServerKnows())
+        status_.num_entries_by_type[type]++;
+      if (e.ref(syncable::IS_DEL))
+        status_.num_to_delete_entries_by_type[type]++;
+    }
+  }
+  return types;
+}
+
+void SyncBackupManager::NormalizeEntries() {
+  WriteTransaction trans(FROM_HERE, GetUserShare());
+  in_normalization_ = true;
+  for (std::set<int64>::const_iterator it = unsynced_.begin();
+      it != unsynced_.end(); ++it) {
+    syncable::MutableEntry entry(trans.GetWrappedWriteTrans(),
+                                 syncable::GET_BY_HANDLE, *it);
+    CHECK(entry.good());
+
+    if (!entry.GetId().ServerKnows())
+      entry.PutId(syncable::Id::CreateFromServerId(entry.GetId().value()));
+    entry.PutBaseVersion(1);
+    entry.PutIsUnsynced(false);
+  }
+  unsynced_.clear();
+}
+
+}  // namespace syncer