106 lines
4.3 KiB
Python
106 lines
4.3 KiB
Python
# Copyright 2015 HuaWei Technologies.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from neutron_lib import exceptions as n_exc
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from oslo_log import log
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from oslo_utils import timeutils
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from sqlalchemy import event
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from sqlalchemy import exc as sql_exc
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from sqlalchemy.orm import session as se
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from neutron._i18n import _LW
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from neutron.db import standard_attr
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LOG = log.getLogger(__name__)
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CHANGED_SINCE = 'changed_since'
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class TimeStamp_db_mixin(object):
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"""Mixin class to add Time Stamp methods."""
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ISO8601_TIME_FORMAT = '%Y-%m-%dT%H:%M:%S'
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def _change_since_result_filter_hook(self, query, filters):
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# this block is for change_since query
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# we get the changed_since string from filters.
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# And translate it from string to datetime type.
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# Then compare with the timestamp in db which has
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# datetime type.
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values = filters and filters.get(CHANGED_SINCE, [])
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if not values:
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return query
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data = filters[CHANGED_SINCE][0]
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try:
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changed_since_string = timeutils.parse_isotime(data)
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except Exception:
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msg = _LW("The input %s must be in the "
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"following format: YYYY-MM-DDTHH:MM:SSZ") % CHANGED_SINCE
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raise n_exc.InvalidInput(error_message=msg)
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changed_since = (timeutils.
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normalize_time(changed_since_string))
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target_model_class = list(query._mapper_adapter_map.keys())[0]
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query = query.join(standard_attr.StandardAttribute,
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target_model_class.standard_attr_id ==
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standard_attr.StandardAttribute.id).filter(
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standard_attr.StandardAttribute.updated_at
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>= changed_since)
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return query
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def update_timestamp(self, session, context, instances):
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objs_list = session.new.union(session.dirty)
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while objs_list:
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obj = objs_list.pop()
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if (isinstance(obj, standard_attr.HasStandardAttributes)
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and obj.standard_attr_id):
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obj.updated_at = timeutils.utcnow()
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def register_db_events(self):
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event.listen(standard_attr.StandardAttribute, 'before_insert',
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self._add_timestamp)
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event.listen(se.Session, 'before_flush', self.update_timestamp)
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def unregister_db_events(self):
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self._unregister_db_event(standard_attr.StandardAttribute,
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'before_insert', self._add_timestamp)
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self._unregister_db_event(se.Session, 'before_flush',
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self.update_timestamp)
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def _unregister_db_event(self, listen_obj, listened_event, listen_hander):
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try:
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event.remove(listen_obj, listened_event, listen_hander)
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except sql_exc.InvalidRequestError:
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LOG.warning(_LW("No sqlalchemy event for resource %s found"),
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listen_obj)
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def _format_timestamp(self, resource_db, result):
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result['created_at'] = (resource_db.created_at.
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strftime(self.ISO8601_TIME_FORMAT)) + 'Z'
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result['updated_at'] = (resource_db.updated_at.
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strftime(self.ISO8601_TIME_FORMAT)) + 'Z'
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def extend_resource_dict_timestamp(self, plugin_obj,
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resource_res, resource_db):
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if (resource_db and resource_db.created_at and
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resource_db.updated_at):
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self._format_timestamp(resource_db, resource_res)
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def _add_timestamp(self, mapper, _conn, target):
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if not target.created_at and not target.updated_at:
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time = timeutils.utcnow()
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for field in ['created_at', 'updated_at']:
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setattr(target, field, time)
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return target
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