104 lines
3.1 KiB
Python
104 lines
3.1 KiB
Python
# Copyright 2011 OpenStack Foundation
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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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"""
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Various conveniences used for migration scripts
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"""
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import sqlalchemy.types
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import glance.openstack.common.log as logging
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LOG = logging.getLogger(__name__)
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String = lambda length: sqlalchemy.types.String(
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length=length, convert_unicode=False,
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unicode_error=None, _warn_on_bytestring=False)
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Text = lambda: sqlalchemy.types.Text(
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length=None, convert_unicode=False,
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unicode_error=None, _warn_on_bytestring=False)
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Boolean = lambda: sqlalchemy.types.Boolean(create_constraint=True, name=None)
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DateTime = lambda: sqlalchemy.types.DateTime(timezone=False)
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Integer = lambda: sqlalchemy.types.Integer()
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BigInteger = lambda: sqlalchemy.types.BigInteger()
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PickleType = lambda: sqlalchemy.types.PickleType()
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def from_migration_import(module_name, fromlist):
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"""
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Import a migration file and return the module
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:param module_name: name of migration module to import from
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(ex: 001_add_images_table)
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:param fromlist: list of items to import (ex: define_images_table)
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:retval: module object
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This bit of ugliness warrants an explanation:
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As you're writing migrations, you'll frequently want to refer to
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tables defined in previous migrations.
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In the interest of not repeating yourself, you need a way of importing
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that table into a 'future' migration.
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However, tables are bound to metadata, so what you need to import is
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really a table factory, which you can late-bind to your current
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metadata object.
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Moreover, migrations begin with a number (001...), which means they
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aren't valid Python identifiers. This means we can't perform a
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'normal' import on them (the Python lexer will 'splode). Instead, we
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need to use __import__ magic to bring the table-factory into our
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namespace.
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Example Usage:
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(define_images_table,) = from_migration_import(
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'001_add_images_table', ['define_images_table'])
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images = define_images_table(meta)
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# Refer to images table
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"""
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module_path = 'glance.db.sqlalchemy.migrate_repo.versions.%s' % module_name
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module = __import__(module_path, globals(), locals(), fromlist, -1)
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return [getattr(module, item) for item in fromlist]
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def create_tables(tables):
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for table in tables:
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LOG.info(_("creating table %(table)s") % {'table': table})
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table.create()
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def drop_tables(tables):
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for table in tables:
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LOG.info(_("dropping table %(table)s") % {'table': table})
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table.drop()
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