Implement new SyncAPI and convert Preferences to it.

chrome/browser/sync/glue/generic_change_processor.cc

 // Copyright (c) 2011 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 "chrome/browser/sync/glue/generic_change_processor.h"
 
-#include "chrome/browser/sync/glue/model_associator.h"
-#include "chrome/browser/sync/syncable_service.h"
+#include "chrome/browser/sync/api/syncable_service.h"
+#include "chrome/browser/sync/api/sync_change.h"
+#include "chrome/browser/sync/engine/syncapi.h"
+#include "chrome/browser/sync/syncable/nigori_util.h"
 
 namespace browser_sync {
 
 GenericChangeProcessor::GenericChangeProcessor(
     SyncableService* local_service,
-    UnrecoverableErrorHandler* error_handler)
+    UnrecoverableErrorHandler* error_handler,
+    sync_api::UserShare* user_share)
     : ChangeProcessor(error_handler),
-      local_service_(local_service) {
+      local_service_(local_service),
+      user_share_(user_share) {
   DCHECK(local_service_);
 }
+
 GenericChangeProcessor::~GenericChangeProcessor() {
   // Set to null to ensure it's not used after destruction.
   local_service_ = NULL;
 }
 
 void GenericChangeProcessor::ApplyChangesFromSyncModel(
     const sync_api::BaseTransaction* trans,
     const sync_api::SyncManager::ChangeRecord* changes,
     int change_count) {
-  local_service_->ApplyChangesFromSync(trans, changes, change_count);
+  DCHECK(running());
+  DCHECK(syncer_changes_.empty());
+  for (int i = 0; i < change_count; ++i) {
+    SyncChange::SyncChangeType action;
+    sync_pb::EntitySpecifics const* specifics = NULL;
+    if (sync_api::SyncManager::ChangeRecord::ACTION_DELETE ==
+        changes[i].action) {
+      action = SyncChange::ACTION_DELETE;
+      specifics = &changes[i].specifics;
+      DCHECK(specifics);
+    } else if (sync_api::SyncManager::ChangeRecord::ACTION_ADD ==
+               changes[i].action) {
+      action = SyncChange::ACTION_ADD;
+    } else {  // ACTION_UPDATE.
+      action = SyncChange::ACTION_UPDATE;
+    }
+    if (!specifics) {
+      // Need to load from node.
+      sync_api::ReadNode read_node(trans);
+      if (!read_node.InitByIdLookup(changes[i].id)) {
+        error_handler()->OnUnrecoverableError(FROM_HERE, "Failed to look up "
+            " data for received change with id " + changes[i].id);
+        return;
+      }
+      specifics = &read_node.GetEntitySpecifics();
+    }
+    DCHECK_NE(syncable::UNSPECIFIED,
+              syncable::GetModelTypeFromSpecifics(*specifics));
+    syncer_changes_.push_back(
+        SyncChange(action, SyncData::CreateRemoteData(*specifics)));
+  }
+}
+
+void GenericChangeProcessor::CommitChangesFromSyncModel() {
+  if (!running())
+    return;
+  if (syncer_changes_.empty())
+    return;
+  local_service_->ProcessSyncChanges(syncer_changes_);
+  syncer_changes_.clear();
+}
+
+bool GenericChangeProcessor::GetSyncDataForType(
+    syncable::ModelType type,
+    SyncDataList* current_sync_data) {
+  std::string type_name = syncable::ModelTypeToString(type);
+  sync_api::ReadTransaction trans(share_handle());
+  sync_api::ReadNode root(&trans);
+  if (!root.InitByTagLookup(syncable::ModelTypeToRootTag(type))) {
+    LOG(ERROR) << "Server did not create the top-level " + type_name + " node."
+               << " We might be running against an out-of-date server.";
+    return false;
+  }
+
+  int64 sync_child_id = root.GetFirstChildId();
+  while (sync_child_id != sync_api::kInvalidId) {
+    sync_api::ReadNode sync_child_node(&trans);
+    if (!sync_child_node.InitByIdLookup(sync_child_id)) {
+      LOG(ERROR) << "Failed to fetch child node for type " + type_name + ".";
+      return false;
+    }
+    current_sync_data->push_back(SyncData::CreateRemoteData(
+        sync_child_node.GetEntitySpecifics()));
+    sync_child_id = sync_child_node.GetSuccessorId();
+  }
+  return true;
+}
+
+void GenericChangeProcessor::ProcessSyncChanges(
+    const SyncChangeList& list_of_changes) {
+  sync_api::WriteTransaction trans(share_handle());
+
+  for (SyncChangeList::const_iterator iter = list_of_changes.begin();
+       iter != list_of_changes.end();
+       ++iter) {
+    const SyncChange& change = *iter;
+    DCHECK_NE(change.sync_data().GetDataType(), syncable::UNSPECIFIED);
+    std::string type_str = syncable::ModelTypeToString(
+        change.sync_data().GetDataType());
+    sync_api::WriteNode sync_node(&trans);
+    if (change.change_type() == SyncChange::ACTION_DELETE) {
+      if (change.sync_data().GetTag() == "" ||
+          !sync_node.InitByClientTagLookup(change.sync_data().GetDataType(),
+                                           change.sync_data().GetTag())) {
+        NOTREACHED();
+        error_handler()->OnUnrecoverableError(FROM_HERE,
+            "Failed to delete " + type_str + " node.");
+        return;
+      }
+      sync_node.Remove();
+    } else if (change.change_type() == SyncChange::ACTION_ADD) {
+      // TODO(sync): Handle other types of creation (custom parents, folders,
+      // etc.).
+      sync_api::ReadNode root_node(&trans);
+      if (!root_node.InitByTagLookup(
+              syncable::ModelTypeToRootTag(change.sync_data().GetDataType()))) {
+        NOTREACHED();
+        error_handler()->OnUnrecoverableError(FROM_HERE,
+            "Failed to look up root node for type " + type_str);
+        return;
+      }
+      if (!sync_node.InitUniqueByCreation(change.sync_data().GetDataType(),
+                                          root_node,
+                                          change.sync_data().GetTag())) {
+        error_handler()->OnUnrecoverableError(FROM_HERE,
+            "Failed to create " + type_str + " node.");
+        return;
+      }
+      sync_node.SetEntitySpecifics(change.sync_data().GetSpecifics());
+    } else if (change.change_type() == SyncChange::ACTION_UPDATE) {
+      if (change.sync_data().GetTag() == "" ||
+          !sync_node.InitByClientTagLookup(change.sync_data().GetDataType(),
+                                           change.sync_data().GetTag())) {
+        NOTREACHED();
+        error_handler()->OnUnrecoverableError(FROM_HERE,
+            "Failed to update " + type_str + " node");
+        return;
+      }
+      sync_node.SetEntitySpecifics(change.sync_data().GetSpecifics());
+      // TODO(sync): Support updating other parts of the sync node (title,
+      // successor, parent, etc.).
+    } else {
+      NOTREACHED();
+      error_handler()->OnUnrecoverableError(FROM_HERE,
+          "Received unset SyncChange in the change processor.");
+      return;
+    }
+  }
+}
+
+bool GenericChangeProcessor::SyncModelHasUserCreatedNodes(
+    syncable::ModelType type,
+    bool* has_nodes) {
+  DCHECK(has_nodes);
+  DCHECK_NE(type, syncable::UNSPECIFIED);
+  std::string type_name = syncable::ModelTypeToString(type);
+  std::string err_str = "Server did not create the top-level " + type_name +
+      " node. We might be running against an out-of-date server.";
+  *has_nodes = false;
+  sync_api::ReadTransaction trans(share_handle());
+  sync_api::ReadNode type_root_node(&trans);
+  if (!type_root_node.InitByTagLookup(syncable::ModelTypeToRootTag(type))) {
+    LOG(ERROR) << err_str;
+    return false;
+  }
+
+  // The sync model has user created nodes if the type's root node has any
+  // children.
+  *has_nodes = sync_api::kInvalidId != type_root_node.GetFirstChildId();
+  return true;
+}
+
+bool GenericChangeProcessor::CryptoReadyIfNecessary(syncable::ModelType type) {
+  DCHECK_NE(type, syncable::UNSPECIFIED);
+  // We only access the cryptographer while holding a transaction.
+  sync_api::ReadTransaction trans(share_handle());
+  const syncable::ModelTypeSet& encrypted_types =
+      syncable::GetEncryptedDataTypes(trans.GetWrappedTrans());
+  return encrypted_types.count(type) == 0 ||
+         trans.GetCryptographer()->is_ready();
 }
 
 void GenericChangeProcessor::StartImpl(Profile* profile) {}
 
 void GenericChangeProcessor::StopImpl() {}
 
+sync_api::UserShare* GenericChangeProcessor::share_handle() {
+  return user_share_;
+}
+
 }  // namespace browser_sync