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// Copyright (c) 2012 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 "base/location.h"
#include "base/string_number_conversions.h"
#include "base/utf_string_conversions.h"
#include "chrome/browser/sync/api/sync_change.h"
#include "chrome/browser/sync/api/sync_error.h"
#include "chrome/browser/sync/api/syncable_service.h"
#include "chrome/browser/sync/internal_api/base_node.h"
#include "chrome/browser/sync/internal_api/change_record.h"
#include "chrome/browser/sync/internal_api/read_node.h"
#include "chrome/browser/sync/internal_api/read_transaction.h"
#include "chrome/browser/sync/internal_api/write_node.h"
#include "chrome/browser/sync/internal_api/write_transaction.h"
#include "content/public/browser/browser_thread.h"
#include "sync/util/unrecoverable_error_handler.h"
using content::BrowserThread;
namespace browser_sync {
GenericChangeProcessor::GenericChangeProcessor(
DataTypeErrorHandler* error_handler,
const base::WeakPtr<SyncableService>& local_service,
sync_api::UserShare* user_share)
: ChangeProcessor(error_handler),
local_service_(local_service),
share_handle_(user_share) {
DCHECK(CalledOnValidThread());
}
GenericChangeProcessor::~GenericChangeProcessor() {
DCHECK(CalledOnValidThread());
}
void GenericChangeProcessor::ApplyChangesFromSyncModel(
const sync_api::BaseTransaction* trans,
const sync_api::ImmutableChangeRecordList& changes) {
DCHECK(CalledOnValidThread());
DCHECK(running());
DCHECK(syncer_changes_.empty());
for (sync_api::ChangeRecordList::const_iterator it =
changes.Get().begin(); it != changes.Get().end(); ++it) {
if (it->action == sync_api::ChangeRecord::ACTION_DELETE) {
syncer_changes_.push_back(
SyncChange(SyncChange::ACTION_DELETE,
SyncData::CreateRemoteData(it->id, it->specifics)));
} else {
SyncChange::SyncChangeType action =
(it->action == sync_api::ChangeRecord::ACTION_ADD) ?
SyncChange::ACTION_ADD : SyncChange::ACTION_UPDATE;
// Need to load specifics from node.
sync_api::ReadNode read_node(trans);
if (!read_node.InitByIdLookup(it->id)) {
error_handler()->OnUnrecoverableError(
FROM_HERE,
"Failed to look up data for received change with id " +
base::Int64ToString(it->id));
return;
}
syncer_changes_.push_back(
SyncChange(action,
SyncData::CreateRemoteData(
it->id, read_node.GetEntitySpecifics())));
}
}
}
void GenericChangeProcessor::CommitChangesFromSyncModel() {
DCHECK(CalledOnValidThread());
if (!running())
return;
if (syncer_changes_.empty())
return;
if (!local_service_) {
syncable::ModelType type = syncer_changes_[0].sync_data().GetDataType();
SyncError error(FROM_HERE, "Local service destroyed.", type);
error_handler()->OnUnrecoverableError(error.location(), error.message());
}
SyncError error = local_service_->ProcessSyncChanges(FROM_HERE,
syncer_changes_);
syncer_changes_.clear();
if (error.IsSet()) {
error_handler()->OnSingleDatatypeUnrecoverableError(
error.location(), error.message());
}
}
SyncError GenericChangeProcessor::GetSyncDataForType(
syncable::ModelType type,
SyncDataList* current_sync_data) {
DCHECK(CalledOnValidThread());
std::string type_name = syncable::ModelTypeToString(type);
sync_api::ReadTransaction trans(FROM_HERE, share_handle());
sync_api::ReadNode root(&trans);
if (!root.InitByTagLookup(syncable::ModelTypeToRootTag(type))) {
SyncError error(FROM_HERE,
"Server did not create the top-level " + type_name +
" node. We might be running against an out-of-date server.",
type);
return error;
}
// TODO(akalin): We'll have to do a tree traversal for bookmarks.
DCHECK_NE(type, syncable::BOOKMARKS);
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)) {
SyncError error(FROM_HERE,
"Failed to fetch child node for type " + type_name + ".",
type);
return error;
}
current_sync_data->push_back(SyncData::CreateRemoteData(
sync_child_node.GetId(), sync_child_node.GetEntitySpecifics()));
sync_child_id = sync_child_node.GetSuccessorId();
}
return SyncError();
}
namespace {
bool AttemptDelete(const SyncChange& change, sync_api::WriteNode* node) {
DCHECK_EQ(change.change_type(), SyncChange::ACTION_DELETE);
if (change.sync_data().IsLocal()) {
const std::string& tag = change.sync_data().GetTag();
if (tag.empty()) {
return false;
}
if (!node->InitByClientTagLookup(
change.sync_data().GetDataType(), tag)) {
return false;
}
} else {
if (!node->InitByIdLookup(change.sync_data().GetRemoteId())) {
return false;
}
}
node->Remove();
return true;
}
} // namespace
SyncError GenericChangeProcessor::ProcessSyncChanges(
const tracked_objects::Location& from_here,
const SyncChangeList& list_of_changes) {
DCHECK(CalledOnValidThread());
sync_api::WriteTransaction trans(from_here, 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);
syncable::ModelType type = change.sync_data().GetDataType();
std::string type_str = syncable::ModelTypeToString(type);
sync_api::WriteNode sync_node(&trans);
if (change.change_type() == SyncChange::ACTION_DELETE) {
if (!AttemptDelete(change, &sync_node)) {
NOTREACHED();
SyncError error(FROM_HERE,
"Failed to delete " + type_str + " node.",
type);
error_handler()->OnSingleDatatypeUnrecoverableError(error.location(),
error.message());
return error;
}
} 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();
SyncError error(FROM_HERE,
"Failed to look up root node for type " + type_str,
type);
error_handler()->OnSingleDatatypeUnrecoverableError(error.location(),
error.message());
return error;
}
if (!sync_node.InitUniqueByCreation(change.sync_data().GetDataType(),
root_node,
change.sync_data().GetTag())) {
NOTREACHED();
SyncError error(FROM_HERE,
"Failed to create " + type_str + " node.",
type);
error_handler()->OnSingleDatatypeUnrecoverableError(error.location(),
error.message());
return error;
}
sync_node.SetTitle(UTF8ToWide(change.sync_data().GetTitle()));
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();
SyncError error(FROM_HERE,
"Failed to update " + type_str + " node.",
type);
error_handler()->OnSingleDatatypeUnrecoverableError(error.location(),
error.message());
return error;
}
sync_node.SetTitle(UTF8ToWide(change.sync_data().GetTitle()));
sync_node.SetEntitySpecifics(change.sync_data().GetSpecifics());
// TODO(sync): Support updating other parts of the sync node (title,
// successor, parent, etc.).
} else {
NOTREACHED();
SyncError error(FROM_HERE,
"Received unset SyncChange in the change processor.",
type);
error_handler()->OnSingleDatatypeUnrecoverableError(error.location(),
error.message());
return error;
}
}
return SyncError();
}
bool GenericChangeProcessor::SyncModelHasUserCreatedNodes(
syncable::ModelType type,
bool* has_nodes) {
DCHECK(CalledOnValidThread());
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(FROM_HERE, 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 = type_root_node.HasChildren();
return true;
}
bool GenericChangeProcessor::CryptoReadyIfNecessary(syncable::ModelType type) {
DCHECK(CalledOnValidThread());
DCHECK_NE(type, syncable::UNSPECIFIED);
// We only access the cryptographer while holding a transaction.
sync_api::ReadTransaction trans(FROM_HERE, share_handle());
const syncable::ModelTypeSet encrypted_types = GetEncryptedTypes(&trans);
return !encrypted_types.Has(type) ||
trans.GetCryptographer()->is_ready();
}
void GenericChangeProcessor::StartImpl(Profile* profile) {
DCHECK(CalledOnValidThread());
}
void GenericChangeProcessor::StopImpl() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
}
sync_api::UserShare* GenericChangeProcessor::share_handle() const {
DCHECK(CalledOnValidThread());
return share_handle_;
}
} // namespace browser_sync
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