246 lines
8.5 KiB
Python
246 lines
8.5 KiB
Python
# Copyright 2013 OpenStack Foundation
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# Copyright 2013 Red Hat, Inc.
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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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import sys
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import migrate
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from migrate import exceptions
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from oslo_config import cfg
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from oslo_db.sqlalchemy import migration
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from oslo_utils import importutils
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import six
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import sqlalchemy
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from keystone.common import sql
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from keystone import contrib
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from keystone import exception
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from keystone.i18n import _
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CONF = cfg.CONF
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DEFAULT_EXTENSIONS = []
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MIGRATED_EXTENSIONS = ['endpoint_policy',
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'federation',
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'oauth1',
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'revoke',
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'endpoint_filter'
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]
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# Different RDBMSs use different schemes for naming the Foreign Key
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# Constraints. SQLAlchemy does not yet attempt to determine the name
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# for the constraint, and instead attempts to deduce it from the column.
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# This fails on MySQL.
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def get_constraints_names(table, column_name):
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fkeys = [fk.name for fk in table.constraints
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if (isinstance(fk, sqlalchemy.ForeignKeyConstraint) and
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column_name in fk.columns)]
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return fkeys
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# remove_constraints and add_constraints both accept a list of dictionaries
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# that contain:
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# {'table': a sqlalchemy table. The constraint is added to dropped from
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# this table.
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# 'fk_column': the name of a column on the above table, The constraint
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# is added to or dropped from this column
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# 'ref_column':a sqlalchemy column object. This is the reference column
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# for the constraint.
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def remove_constraints(constraints):
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for constraint_def in constraints:
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constraint_names = get_constraints_names(constraint_def['table'],
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constraint_def['fk_column'])
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for constraint_name in constraint_names:
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migrate.ForeignKeyConstraint(
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columns=[getattr(constraint_def['table'].c,
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constraint_def['fk_column'])],
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refcolumns=[constraint_def['ref_column']],
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name=constraint_name).drop()
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def add_constraints(constraints):
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for constraint_def in constraints:
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if constraint_def['table'].kwargs.get('mysql_engine') == 'MyISAM':
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# Don't try to create constraint when using MyISAM because it's
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# not supported.
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continue
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ref_col = constraint_def['ref_column']
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ref_engine = ref_col.table.kwargs.get('mysql_engine')
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if ref_engine == 'MyISAM':
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# Don't try to create constraint when using MyISAM because it's
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# not supported.
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continue
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migrate.ForeignKeyConstraint(
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columns=[getattr(constraint_def['table'].c,
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constraint_def['fk_column'])],
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refcolumns=[constraint_def['ref_column']]).create()
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def rename_tables_with_constraints(renames, constraints, engine):
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"""Rename tables with foreign key constraints.
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Tables are renamed after first removing constraints. The constraints are
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replaced after the rename is complete.
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This works on databases that don't support renaming tables that have
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constraints on them (DB2).
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`renames` is a dict, mapping {'to_table_name': from_table, ...}
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"""
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if engine.name != 'sqlite':
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# SQLite doesn't support constraints, so nothing to remove.
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remove_constraints(constraints)
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for to_table_name in renames:
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from_table = renames[to_table_name]
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from_table.rename(to_table_name)
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if engine != 'sqlite':
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add_constraints(constraints)
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def find_migrate_repo(package=None, repo_name='migrate_repo'):
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package = package or sql
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path = os.path.abspath(os.path.join(
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os.path.dirname(package.__file__), repo_name))
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if os.path.isdir(path):
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return path
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raise exception.MigrationNotProvided(package.__name__, path)
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def _sync_common_repo(version):
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abs_path = find_migrate_repo()
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init_version = get_init_version()
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with sql.session_for_write() as session:
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engine = session.get_bind()
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_assert_not_schema_downgrade(version=version)
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migration.db_sync(engine, abs_path, version=version,
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init_version=init_version, sanity_check=False)
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def get_init_version(abs_path=None):
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"""Get the initial version of a migrate repository.
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:param abs_path: Absolute path to migrate repository.
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:return: initial version number or None, if DB is empty.
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"""
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if abs_path is None:
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abs_path = find_migrate_repo()
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repo = migrate.versioning.repository.Repository(abs_path)
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# Sadly, Repository has a `latest` but not an `oldest`.
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# The value is a VerNum object which needs to be converted into an int.
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oldest = int(min(repo.versions.versions))
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if oldest < 1:
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return None
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# The initial version is one less
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return oldest - 1
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def _assert_not_schema_downgrade(extension=None, version=None):
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if version is not None:
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try:
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current_ver = int(six.text_type(get_db_version(extension)))
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if int(version) < current_ver:
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raise migration.exception.DbMigrationError(
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_("Unable to downgrade schema"))
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except exceptions.DatabaseNotControlledError: # nosec
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# NOTE(morganfainberg): The database is not controlled, this action
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# cannot be a downgrade.
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pass
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def _sync_extension_repo(extension, version):
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if extension in MIGRATED_EXTENSIONS:
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raise exception.MigrationMovedFailure(extension=extension)
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with sql.session_for_write() as session:
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engine = session.get_bind()
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try:
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package_name = '.'.join((contrib.__name__, extension))
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package = importutils.import_module(package_name)
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except ImportError:
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raise ImportError(_("%s extension does not exist.")
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% package_name)
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try:
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abs_path = find_migrate_repo(package)
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try:
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migration.db_version_control(engine, abs_path)
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# Register the repo with the version control API
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# If it already knows about the repo, it will throw
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# an exception that we can safely ignore
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except exceptions.DatabaseAlreadyControlledError: # nosec
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pass
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except exception.MigrationNotProvided as e:
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print(e)
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sys.exit(1)
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_assert_not_schema_downgrade(extension=extension, version=version)
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init_version = get_init_version(abs_path=abs_path)
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migration.db_sync(engine, abs_path, version=version,
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init_version=init_version, sanity_check=False)
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def sync_database_to_version(extension=None, version=None):
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if not extension:
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_sync_common_repo(version)
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# If version is greater than 0, it is for the common
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# repository only, and only that will be synchronized.
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if version is None:
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for default_extension in DEFAULT_EXTENSIONS:
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_sync_extension_repo(default_extension, version)
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else:
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_sync_extension_repo(extension, version)
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def get_db_version(extension=None):
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if not extension:
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with sql.session_for_write() as session:
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return migration.db_version(session.get_bind(),
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find_migrate_repo(),
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get_init_version())
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try:
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package_name = '.'.join((contrib.__name__, extension))
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package = importutils.import_module(package_name)
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except ImportError:
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raise ImportError(_("%s extension does not exist.")
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% package_name)
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with sql.session_for_write() as session:
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return migration.db_version(
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session.get_bind(), find_migrate_repo(package), 0)
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def print_db_version(extension=None):
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try:
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db_version = get_db_version(extension=extension)
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print(db_version)
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except exception.MigrationNotProvided as e:
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print(e)
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sys.exit(1)
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