# -*- coding: utf-8 -*-
###########################################################################
# Copyright (c), The AiiDA team. All rights reserved. #
# This file is part of the AiiDA code. #
# #
# The code is hosted on GitHub at https://github.com/aiidateam/aiida_core #
# For further information on the license, see the LICENSE.txt file #
# For further information please visit http://www.aiida.net #
###########################################################################
"""Backup implementation for SqlAlchemy backend."""
from __future__ import division
from __future__ import print_function
from __future__ import absolute_import
import os
import aiida.backends.sqlalchemy
from aiida.backends.sqlalchemy.models.node import DbNode
from aiida.manage.backup.backup_base import AbstractBackup, BackupError
from aiida.common.folders import RepositoryFolder
from aiida.orm.utils.repository import Repository
[docs]class Backup(AbstractBackup):
"""
Backup for sqlalchemy backend
"""
_batch_size = 50
[docs] def _query_first_node(self):
"""
Query first node
:return:
"""
res = aiida.backends.sqlalchemy.get_scoped_session().query(DbNode).order_by(DbNode.ctime).first()
if res is None:
return list()
return [res]
[docs] def _get_query_set_length(self, query_set):
"""
Get query set length
"""
return query_set.count()
[docs] def _get_query_sets(self, start_of_backup, backup_end_for_this_round):
"""
Get Nodes and Worflows query set from start to en
d of backup.
:param start_of_backup:
:param backup_end_for_this_round:
:return:
"""
q_nodes = aiida.backends.sqlalchemy.get_scoped_session().query(DbNode).filter(
DbNode.mtime >= start_of_backup).filter(DbNode.mtime <= backup_end_for_this_round)
return [q_nodes]
[docs] def _get_query_set_iterator(self, query_set):
"""
Get query set iterator
:param query_set:
:return:
"""
return query_set.yield_per(self._batch_size)
[docs] def _get_source_directory(self, item):
"""
:param item:
:return:
"""
# pylint: disable=protected-access
if isinstance(item, DbNode):
source_dir = os.path.normpath(RepositoryFolder(section=Repository._section_name, uuid=item.uuid).abspath)
else:
# Raise exception
self._logger.error("Unexpected item type to backup: %s", type(item))
raise BackupError("Unexpected item type to backup: {}".format(type(item)))
return source_dir