170 lines
6.0 KiB
Python
170 lines
6.0 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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"""Database setup and migration commands."""
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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 import migration as alembic_migration
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from migrate import exceptions as migrate_exceptions
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from migrate.versioning import api as migrate_api
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from migrate.versioning import repository as migrate_repo
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from oslo_config import cfg
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from oslo_db import options
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from oslo_log import log as logging
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from cinder.db.sqlalchemy import api as db_api
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options.set_defaults(cfg.CONF)
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LOG = logging.getLogger(__name__)
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MIGRATE_INIT_VERSION = 134
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MIGRATE_MIGRATIONS_PATH = ALEMBIC_INIT_VERSION = '921e1a36b076'
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def _find_migrate_repo():
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"""Get the project's change script repository
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:returns: An instance of ``migrate.versioning.repository.Repository``
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"""
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path = os.path.join(
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os.path.abspath(os.path.dirname(__file__)), 'legacy_migrations',
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)
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return migrate_repo.Repository(path)
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def _find_alembic_conf():
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"""Get the project's alembic configuration
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:returns: An instance of ``alembic.config.Config``
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"""
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path = os.path.join(
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os.path.abspath(os.path.dirname(__file__)), 'alembic.ini')
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config = alembic_config.Config(os.path.abspath(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 _is_database_under_migrate_control(engine, repository):
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try:
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migrate_api.db_version(engine, repository)
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return True
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except migrate_exceptions.DatabaseNotControlledError:
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return False
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def _is_database_under_alembic_control(engine):
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with engine.connect() as conn:
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context = alembic_migration.MigrationContext.configure(conn)
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return bool(context.get_current_revision())
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def _init_alembic_on_legacy_database(engine, repository, config):
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"""Init alembic in an existing environment with sqlalchemy-migrate."""
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LOG.info(
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'The database is still under sqlalchemy-migrate control; '
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'applying any remaining sqlalchemy-migrate-based migrations '
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'and fake applying the initial alembic migration'
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)
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migrate_api.upgrade(engine, repository)
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# re-use 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.stamp(config, ALEMBIC_INIT_VERSION)
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def _upgrade_alembic(engine, config, version):
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# re-use 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_version():
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"""Get database version."""
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repository = _find_migrate_repo()
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engine = db_api.get_engine()
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migrate_version = None
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if _is_database_under_migrate_control(engine, repository):
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migrate_version = migrate_api.db_version(engine, repository)
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alembic_version = None
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if _is_database_under_alembic_control(engine):
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alembic_version = alembic_api.current(engine)
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return alembic_version or migrate_version
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def db_sync(version=None, engine=None):
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"""Migrate the database to `version` or the most recent version.
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We're currently straddling two migration systems, sqlalchemy-migrate and
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alembic. This handles both by ensuring we switch from one to the other at
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the appropriate moment.
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"""
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# if the user requested a specific version, check if it's an integer: if
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# so, we're almost certainly in sqlalchemy-migrate land and won't support
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# that
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if version is not None and version.isdigit():
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raise ValueError(
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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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if engine is None:
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engine = db_api.get_engine()
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repository = _find_migrate_repo()
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config = _find_alembic_conf()
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# discard the URL encoded in alembic.ini in favour of the URL configured
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# for the engine by the database fixtures, casting from
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# 'sqlalchemy.engine.url.URL' to str in the process. This returns a
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# RFC-1738 quoted URL, which means that a password like "foo@" will be
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# turned into "foo%40". This in turns causes a problem for
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# set_main_option() because that uses ConfigParser.set, which (by design)
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# uses *python* interpolation to write the string out ... where "%" is the
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# special python interpolation character! Avoid this mismatch by quoting
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# all %'s for the set below.
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engine_url = str(engine.url).replace('%', '%%')
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config.set_main_option('sqlalchemy.url', str(engine_url))
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# if we're in a deployment where sqlalchemy-migrate is already present,
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# then apply all the updates for that and fake apply the initial alembic
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# migration; if we're not then 'upgrade' will take care of everything
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# this should be a one-time operation
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if (
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_is_database_under_migrate_control(engine, repository) and
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not _is_database_under_alembic_control(engine)
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):
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_init_alembic_on_legacy_database(engine, repository, config)
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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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