109 lines
3.8 KiB
Python
109 lines
3.8 KiB
Python
# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# 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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from alembic import command as alembic_api
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from alembic import config as alembic_config
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from alembic.runtime import migration as alembic_migration
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from oslo_log import log as logging
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from nova.db.api import api as api_db_api
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from nova.db.main import api as main_db_api
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from nova import exception
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LOG = logging.getLogger(__name__)
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def _get_engine(database='main', context=None):
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if database == 'main':
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return main_db_api.get_engine(context=context)
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if database == 'api':
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return api_db_api.get_engine()
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def _find_alembic_conf(database='main'):
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"""Get the path for the alembic repository."""
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path = os.path.join(
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os.path.abspath(os.path.dirname(__file__)),
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database, 'alembic.ini')
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config = alembic_config.Config(path)
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# we don't want to use the logger configuration from the file, which is
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# only really intended for the CLI
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# https://stackoverflow.com/a/42691781/613428
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config.attributes['configure_logger'] = False
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return config
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def _upgrade_alembic(engine, config, version):
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# reuse the connection rather than creating a new one
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with engine.begin() as connection:
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config.attributes['connection'] = connection
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alembic_api.upgrade(config, version or 'head')
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def db_sync(version=None, database='main', context=None):
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"""Migrate the database to `version` or the most recent version."""
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if database not in ('main', 'api'):
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raise exception.Invalid('%s is not a valid database' % database)
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# if the user requested a specific version, check if it's an integer:
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# if so, we're almost certainly in sqlalchemy-migrate land and won't
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# support that
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if version is not None and version.isdigit():
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raise exception.Invalid(
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'You requested an sqlalchemy-migrate database version; this is '
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'no longer supported'
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)
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engine = _get_engine(database, context=context)
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config = _find_alembic_conf(database)
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# discard the URL stored in alembic.ini in favour of the URL configured
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# for the engine, casting from 'sqlalchemy.engine.url.URL' to str in the
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# process
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# NOTE(sean-k-mooney): the engine has already url encoded the connection
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# string using a mix of url encode styles for different parts of the url.
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# since we are updating the alembic config parser instance we need to
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# escape '%' to '%%' to account for ConfigParser's string interpolation.
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url = str(engine.url).replace('%', '%%')
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config.set_main_option('sqlalchemy.url', url)
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# apply anything later
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LOG.info('Applying migration(s)')
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_upgrade_alembic(engine, config, version)
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LOG.info('Migration(s) applied')
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def db_version(database='main', context=None):
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"""Display the current database version."""
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if database not in ('main', 'api'):
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raise exception.Invalid('%s is not a valid database' % database)
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engine = _get_engine(database, context=context)
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with engine.connect() as conn:
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m_context = alembic_migration.MigrationContext.configure(conn)
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version = m_context.get_current_revision()
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return version
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