95 lines
2.7 KiB
Python
95 lines
2.7 KiB
Python
# All Rights Reserved.
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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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import os
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import threading
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from stevedore import driver
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from oslo_config import cfg
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from oslo_db import api as db_api
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from oslo_db.sqlalchemy import migration
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from oslo_log import log
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from freezer_api.db import base as db_base
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from freezer_api.db.sqlalchemy import api as db_session
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from freezer_api.db.sqlalchemy import models
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INIT_VERSION = 0
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_IMPL = None
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_LOCK = threading.Lock()
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CONF = cfg.CONF
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LOG = log.getLogger(__name__)
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MIGRATE_REPO_PATH = os.path.join(
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os.path.abspath(os.path.dirname(__file__)),
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'migrate_repo',
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)
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_BACKEND_MAPPING = {'sqlalchemy': 'freezer_api.db.sqlalchemy.api'}
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class SQLDriver(db_base.DBDriver):
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def __init__(self, backend):
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super(SQLDriver, self).__init__(backend)
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self.IMPL = db_api.DBAPI.from_config(CONF, _BACKEND_MAPPING)
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self._engine = None
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def get_engine(self):
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if not self._engine:
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self._engine = db_session.get_engine()
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return self._engine
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def get_api(self):
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self.get_engine()
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return self.IMPL
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def get_backend(self):
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global _IMPL
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if _IMPL is None:
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with _LOCK:
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if _IMPL is None:
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_IMPL = driver.DriverManager(
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"freezer.database.migration_backend",
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cfg.CONF.database.backend).driver
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return _IMPL
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def db_sync(self, version=None, init_version=INIT_VERSION, engine=None):
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"""Migrate the database to `version` or the most recent version."""
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if not self._engine:
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self._engine = self.get_engine()
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return migration.db_sync(engine=self._engine,
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abs_path=MIGRATE_REPO_PATH,
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version=version,
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init_version=init_version)
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def db_show(self):
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if not self._engine:
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self._engine = self.get_engine()
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return models.get_tables(self._engine)
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def db_remove(self):
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if not self._engine:
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self._engine = self.get_engine()
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models.unregister_models(self._engine)
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def name(self):
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return "sqlalchemy"
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