101 lines
2.8 KiB
Python
101 lines
2.8 KiB
Python
# 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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'''
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Implementation of SQLAlchemy backend.
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'''
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import sys
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from oslo_config import cfg
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from oslo_db import exception as db_exc
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from oslo_db.sqlalchemy import session as db_session
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from oslo_db.sqlalchemy import utils as db_utils
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from evoque.common import exceptions
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from evoque.common.i18n import _
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from evoque.db.sqlalchemy import migration
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from evoque.db.sqlalchemy import models
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CONF = cfg.CONF
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_facade = None
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def get_facade():
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global _facade
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if not _facade:
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_facade = db_session.EngineFacade.from_config(CONF)
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return _facade
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get_engine = lambda: get_facade().get_engine()
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get_session = lambda: get_facade().get_session()
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def get_backend():
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"""The backend is this module itself."""
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return sys.modules[__name__]
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def _session():
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return get_session()
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def model_query(model, *args):
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session = _session()
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query = session.query(model, *args)
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return query
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def _paginate_query(model, limit=None, marker=None, sort_key=None,
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sort_dir=None, query=None):
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if not query:
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query = model_query(model)
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sort_keys = ['id']
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if sort_key and sort_key not in sort_keys:
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sort_keys.insert(0, sort_key)
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try:
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query = db_utils.paginate_query(query, model, limit, sort_keys,
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marker=marker, sort_dir=sort_dir)
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except db_exc.InvalidSortKey:
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raise exceptions.InvalidParameterValue(
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_('The sort_key value "%(key)s" is an invalid field for sorting')
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% {'key': sort_key})
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return query.all()
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# Tickets
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def ticket_create(context, values):
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ticket_ref = models.Ticket()
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ticket_ref.update(values)
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ticket_ref.save(_session())
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return ticket_ref
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def ticket_get_all(context, filters=None, limit=None, marker=None,
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sort_key=None, sort_dir=None):
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query = model_query(models.Ticket)
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return _paginate_query(models.Ticket, limit, marker,
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sort_key, sort_dir, query)
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# Utils
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def db_sync(engine, version=None):
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"""Migrate the database to `version` or the most recent version."""
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return migration.db_sync(engine, version=version)
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def db_version(engine):
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"""Display the current database version."""
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return migration.db_version(engine)
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