738 lines
26 KiB
Python
738 lines
26 KiB
Python
# Copyright 2012 New Dream Network, LLC (DreamHost)
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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 copy
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from logging import config as logging_config
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import os
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from alembic import command as alembic_command
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from alembic import config as alembic_config
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from alembic import environment
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from alembic import migration as alembic_migration
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from alembic import script as alembic_script
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from alembic import util as alembic_util
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from oslo_config import cfg
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from oslo_utils import fileutils
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from oslo_utils import importutils
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import pkg_resources
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import six
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from neutron._i18n import _
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from neutron.common import utils
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from neutron.db import migration
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from neutron.db.migration.connection import DBConnection
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HEAD_FILENAME = 'HEAD'
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HEADS_FILENAME = 'HEADS'
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CONTRACT_HEAD_FILENAME = 'CONTRACT_HEAD'
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EXPAND_HEAD_FILENAME = 'EXPAND_HEAD'
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CURRENT_RELEASE = migration.NEWTON
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RELEASES = (
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migration.LIBERTY,
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migration.MITAKA,
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migration.NEWTON,
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)
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EXPAND_BRANCH = 'expand'
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CONTRACT_BRANCH = 'contract'
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MIGRATION_BRANCHES = (EXPAND_BRANCH, CONTRACT_BRANCH)
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MIGRATION_ENTRYPOINTS = 'neutron.db.alembic_migrations'
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migration_entrypoints = {
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entrypoint.name: entrypoint
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for entrypoint in pkg_resources.iter_entry_points(MIGRATION_ENTRYPOINTS)
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}
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neutron_alembic_ini = os.path.join(os.path.dirname(__file__), 'alembic.ini')
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VALID_SERVICES = ['fwaas', 'lbaas', 'vpnaas']
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INSTALLED_SERVICES = [service_ for service_ in VALID_SERVICES
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if 'neutron-%s' % service_ in migration_entrypoints]
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INSTALLED_SUBPROJECTS = [project_ for project_ in migration_entrypoints]
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_core_opts = [
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cfg.StrOpt('core_plugin',
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default='',
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help=_('Neutron plugin provider module'),
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deprecated_for_removal=True),
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cfg.StrOpt('service',
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choices=INSTALLED_SERVICES,
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help=(_("(Deprecated. Use '--subproject neutron-SERVICE' "
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"instead.) The advanced service to execute the "
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"command against.")),
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deprecated_for_removal=True),
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cfg.StrOpt('subproject',
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choices=INSTALLED_SUBPROJECTS,
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help=(_("The subproject to execute the command against. "
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"Can be one of: '%s'.")
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% "', '".join(INSTALLED_SUBPROJECTS))),
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cfg.BoolOpt('split_branches',
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default=False,
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help=_("Enforce using split branches file structure."))
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]
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_quota_opts = [
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cfg.StrOpt('quota_driver',
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default='',
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help=_('Neutron quota driver class'),
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deprecated_for_removal=True),
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]
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_db_opts = [
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cfg.StrOpt('connection',
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deprecated_name='sql_connection',
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default='',
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secret=True,
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help=_('URL to database')),
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cfg.StrOpt('engine',
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default='',
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help=_('Database engine for which script will be generated '
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'when using offline migration.')),
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]
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CONF = cfg.ConfigOpts()
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CONF.register_cli_opts(_core_opts)
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CONF.register_cli_opts(_db_opts, 'database')
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CONF.register_opts(_quota_opts, 'QUOTAS')
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def do_alembic_command(config, cmd, revision=None, desc=None, **kwargs):
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args = []
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if revision:
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args.append(revision)
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project = config.get_main_option('neutron_project')
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if desc:
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alembic_util.msg(_('Running %(cmd)s (%(desc)s) for %(project)s ...') %
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{'cmd': cmd, 'desc': desc, 'project': project})
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else:
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alembic_util.msg(_('Running %(cmd)s for %(project)s ...') %
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{'cmd': cmd, 'project': project})
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try:
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getattr(alembic_command, cmd)(config, *args, **kwargs)
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except alembic_util.CommandError as e:
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alembic_util.err(six.text_type(e))
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alembic_util.msg(_('OK'))
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def _get_alembic_entrypoint(project):
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if project not in migration_entrypoints:
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alembic_util.err(_('Sub-project %s not installed.') % project)
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return migration_entrypoints[project]
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def do_generic_show(config, cmd):
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kwargs = {'verbose': CONF.command.verbose}
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do_alembic_command(config, cmd, **kwargs)
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def do_check_migration(config, cmd):
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do_alembic_command(config, 'branches')
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validate_revisions(config)
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validate_head_files(config)
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def add_alembic_subparser(sub, cmd):
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return sub.add_parser(cmd, help=getattr(alembic_command, cmd).__doc__)
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def add_branch_options(parser):
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group = parser.add_mutually_exclusive_group()
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group.add_argument('--expand', action='store_true')
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group.add_argument('--contract', action='store_true')
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return group
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def _find_milestone_revisions(config, milestone, branch=None):
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"""Return the revision(s) for a given milestone."""
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script = alembic_script.ScriptDirectory.from_config(config)
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return [
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(m.revision, label)
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for m in _get_revisions(script)
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for label in (m.branch_labels or [None])
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if milestone in getattr(m.module, 'neutron_milestone', []) and
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(branch is None or branch in m.branch_labels)
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]
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def do_upgrade(config, cmd):
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branch = None
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if ((CONF.command.revision or CONF.command.delta) and
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(CONF.command.expand or CONF.command.contract)):
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raise SystemExit(_(
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'Phase upgrade options do not accept revision specification'))
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if CONF.command.expand:
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branch = EXPAND_BRANCH
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revision = _get_branch_head(EXPAND_BRANCH)
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elif CONF.command.contract:
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branch = CONTRACT_BRANCH
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revision = _get_branch_head(CONTRACT_BRANCH)
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elif not CONF.command.revision and not CONF.command.delta:
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raise SystemExit(_('You must provide a revision or relative delta'))
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else:
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revision = CONF.command.revision or ''
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if '-' in revision:
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raise SystemExit(_('Negative relative revision (downgrade) not '
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'supported'))
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delta = CONF.command.delta
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if delta:
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if '+' in revision:
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raise SystemExit(_('Use either --delta or relative revision, '
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'not both'))
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if delta < 0:
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raise SystemExit(_('Negative delta (downgrade) not supported'))
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revision = '%s+%d' % (revision, delta)
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# leave branchless 'head' revision request backward compatible by
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# applying all heads in all available branches.
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if revision == 'head':
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revision = 'heads'
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if revision in migration.NEUTRON_MILESTONES:
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expand_revisions = _find_milestone_revisions(config, revision,
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EXPAND_BRANCH)
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contract_revisions = _find_milestone_revisions(config, revision,
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CONTRACT_BRANCH)
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# Expand revisions must be run before contract revisions
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revisions = expand_revisions + contract_revisions
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else:
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revisions = [(revision, branch)]
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for revision, branch in revisions:
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if not CONF.command.sql:
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run_sanity_checks(config, revision)
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do_alembic_command(config, cmd, revision=revision,
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desc=branch, sql=CONF.command.sql)
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def no_downgrade(config, cmd):
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raise SystemExit(_("Downgrade no longer supported"))
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def do_stamp(config, cmd):
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do_alembic_command(config, cmd,
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revision=CONF.command.revision,
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sql=CONF.command.sql)
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def _get_branch_head(branch):
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'''Get the latest @head specification for a branch.'''
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return '%s@head' % branch
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def _check_bootstrap_new_branch(branch, version_path, addn_kwargs):
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addn_kwargs['version_path'] = version_path
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addn_kwargs['head'] = _get_branch_head(branch)
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if not os.path.exists(version_path):
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# Bootstrap initial directory structure
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utils.ensure_dir(version_path)
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def do_revision(config, cmd):
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kwargs = {
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'message': CONF.command.message,
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'autogenerate': CONF.command.autogenerate,
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'sql': CONF.command.sql,
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}
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branches = []
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if CONF.command.expand:
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kwargs['head'] = 'expand@head'
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branches.append(EXPAND_BRANCH)
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elif CONF.command.contract:
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kwargs['head'] = 'contract@head'
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branches.append(CONTRACT_BRANCH)
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else:
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branches = MIGRATION_BRANCHES
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if not CONF.command.autogenerate:
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for branch in branches:
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args = copy.copy(kwargs)
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version_path = _get_version_branch_path(
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config, release=CURRENT_RELEASE, branch=branch)
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_check_bootstrap_new_branch(branch, version_path, args)
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do_alembic_command(config, cmd, **args)
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else:
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# autogeneration code will take care of enforcing proper directories
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do_alembic_command(config, cmd, **kwargs)
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update_head_files(config)
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def _get_release_labels(labels):
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result = set()
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for label in labels:
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# release labels were introduced Liberty for a short time and dropped
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# in that same release cycle
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result.add('%s_%s' % (migration.LIBERTY, label))
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return result
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def _compare_labels(revision, expected_labels):
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# validate that the script has expected labels only
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bad_labels = revision.branch_labels - expected_labels
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if bad_labels:
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# NOTE(ihrachyshka): this hack is temporary to accommodate those
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# projects that already initialized their branches with liberty_*
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# labels. Let's notify them about the deprecation for now and drop it
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# later.
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bad_labels_with_release = (revision.branch_labels -
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_get_release_labels(expected_labels))
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if not bad_labels_with_release:
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alembic_util.warn(
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_('Release aware branch labels (%s) are deprecated. '
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'Please switch to expand@ and contract@ '
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'labels.') % bad_labels)
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return
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script_name = os.path.basename(revision.path)
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alembic_util.err(
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_('Unexpected label for script %(script_name)s: %(labels)s') %
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{'script_name': script_name,
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'labels': bad_labels}
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)
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def _validate_single_revision_labels(script_dir, revision, label=None):
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expected_labels = set()
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if label is not None:
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expected_labels.add(label)
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_compare_labels(revision, expected_labels)
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# if it's not the root element of the branch, expect the parent of the
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# script to have the same label
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if revision.down_revision is not None:
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down_revision = script_dir.get_revision(revision.down_revision)
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_compare_labels(down_revision, expected_labels)
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def _validate_revision(script_dir, revision):
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for branch in MIGRATION_BRANCHES:
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if branch in revision.path:
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_validate_single_revision_labels(
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script_dir, revision, label=branch)
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return
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# validate script from branchless part of migration rules
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_validate_single_revision_labels(script_dir, revision)
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def validate_revisions(config):
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script_dir = alembic_script.ScriptDirectory.from_config(config)
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revisions = _get_revisions(script_dir)
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for revision in revisions:
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_validate_revision(script_dir, revision)
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branchpoints = _get_branch_points(script_dir)
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if len(branchpoints) > 1:
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branchpoints = ', '.join(p.revision for p in branchpoints)
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alembic_util.err(
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_('Unexpected number of alembic branch points: %(branchpoints)s') %
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{'branchpoints': branchpoints}
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)
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def _get_revisions(script):
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return list(script.walk_revisions(base='base', head='heads'))
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def _get_branch_points(script):
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branchpoints = []
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for revision in _get_revisions(script):
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if revision.is_branch_point:
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branchpoints.append(revision)
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return branchpoints
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def _get_heads_map(config):
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script = alembic_script.ScriptDirectory.from_config(config)
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heads = script.get_heads()
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head_map = {}
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for head in heads:
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if CONTRACT_BRANCH in script.get_revision(head).branch_labels:
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head_map[CONTRACT_BRANCH] = head
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else:
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head_map[EXPAND_BRANCH] = head
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return head_map
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def _check_head(branch_name, head_file, head):
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try:
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with open(head_file) as file_:
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observed_head = file_.read().strip()
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except IOError:
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pass
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else:
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if observed_head != head:
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alembic_util.err(
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_('%(branch)s HEAD file does not match migration timeline '
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'head, expected: %(head)s') % {'branch': branch_name.title(),
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'head': head})
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def validate_head_files(config):
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'''Check that HEAD files contain the latest head for the branch.'''
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contract_head = _get_contract_head_file_path(config)
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expand_head = _get_expand_head_file_path(config)
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if not os.path.exists(contract_head) or not os.path.exists(expand_head):
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alembic_util.warn(_("Repository does not contain HEAD files for "
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"contract and expand branches."))
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return
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head_map = _get_heads_map(config)
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_check_head(CONTRACT_BRANCH, contract_head, head_map[CONTRACT_BRANCH])
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_check_head(EXPAND_BRANCH, expand_head, head_map[EXPAND_BRANCH])
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def update_head_files(config):
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'''Update HEAD files with the latest branch heads.'''
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head_map = _get_heads_map(config)
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contract_head = _get_contract_head_file_path(config)
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expand_head = _get_expand_head_file_path(config)
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with open(contract_head, 'w+') as f:
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f.write(head_map[CONTRACT_BRANCH] + '\n')
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with open(expand_head, 'w+') as f:
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f.write(head_map[EXPAND_BRANCH] + '\n')
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old_head_file = _get_head_file_path(config)
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old_heads_file = _get_heads_file_path(config)
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for file_ in (old_head_file, old_heads_file):
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fileutils.delete_if_exists(file_)
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def _get_current_database_heads(config):
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with DBConnection(config.neutron_config.database.connection) as conn:
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opts = {
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'version_table': get_alembic_version_table(config)
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}
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context = alembic_migration.MigrationContext.configure(
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conn, opts=opts)
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return context.get_current_heads()
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def has_offline_migrations(config, cmd):
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heads_map = _get_heads_map(config)
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if heads_map[CONTRACT_BRANCH] not in _get_current_database_heads(config):
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# If there is at least one contract revision not applied to database,
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# it means we should shut down all neutron-server instances before
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# proceeding with upgrade.
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project = config.get_main_option('neutron_project')
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alembic_util.msg(_('Need to apply migrations from %(project)s '
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'contract branch. This will require all Neutron '
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'server instances to be shutdown before '
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'proceeding with the upgrade.') %
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{"project": project})
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return True
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return False
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def add_command_parsers(subparsers):
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for name in ['current', 'history', 'branches', 'heads']:
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parser = add_alembic_subparser(subparsers, name)
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parser.set_defaults(func=do_generic_show)
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parser.add_argument('--verbose',
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action='store_true',
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help='Display more verbose output for the '
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'specified command')
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help_text = (getattr(alembic_command, 'branches').__doc__ +
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' and validate head file')
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parser = subparsers.add_parser('check_migration', help=help_text)
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parser.set_defaults(func=do_check_migration)
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parser = add_alembic_subparser(subparsers, 'upgrade')
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parser.add_argument('--delta', type=int)
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parser.add_argument('--sql', action='store_true')
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parser.add_argument('revision', nargs='?')
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parser.add_argument('--mysql-engine',
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default='',
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help='Change MySQL storage engine of current '
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'existing tables')
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add_branch_options(parser)
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parser.set_defaults(func=do_upgrade)
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parser = subparsers.add_parser('downgrade', help="(No longer supported)")
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parser.add_argument('None', nargs='?', help="Downgrade not supported")
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parser.set_defaults(func=no_downgrade)
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parser = add_alembic_subparser(subparsers, 'stamp')
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parser.add_argument('--sql', action='store_true')
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parser.add_argument('revision')
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parser.set_defaults(func=do_stamp)
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parser = add_alembic_subparser(subparsers, 'revision')
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parser.add_argument('-m', '--message')
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parser.add_argument('--sql', action='store_true')
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group = add_branch_options(parser)
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group.add_argument('--autogenerate', action='store_true')
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parser.set_defaults(func=do_revision)
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parser = subparsers.add_parser(
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'has_offline_migrations',
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help='Determine whether there are pending migration scripts that '
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'require full shutdown for all services that directly access '
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'database.')
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parser.set_defaults(func=has_offline_migrations)
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command_opt = cfg.SubCommandOpt('command',
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title='Command',
|
|
help=_('Available commands'),
|
|
handler=add_command_parsers)
|
|
|
|
CONF.register_cli_opt(command_opt)
|
|
|
|
|
|
def _get_project_base(config):
|
|
'''Return the base python namespace name for a project.'''
|
|
script_location = config.get_main_option('script_location')
|
|
return script_location.split(':')[0].split('.')[0]
|
|
|
|
|
|
def _get_package_root_dir(config):
|
|
root_module = importutils.try_import(_get_project_base(config))
|
|
if not root_module:
|
|
project = config.get_main_option('neutron_project')
|
|
alembic_util.err(_("Failed to locate source for %s.") % project)
|
|
# The root_module.__file__ property is a path like
|
|
# '/opt/stack/networking-foo/networking_foo/__init__.py'
|
|
# We return just
|
|
# '/opt/stack/networking-foo'
|
|
return os.path.dirname(os.path.dirname(root_module.__file__))
|
|
|
|
|
|
def _get_root_versions_dir(config):
|
|
'''Return root directory that contains all migration rules.'''
|
|
root_dir = _get_package_root_dir(config)
|
|
script_location = config.get_main_option('script_location')
|
|
# Script location is something like:
|
|
# 'project_base.db.migration:alembic_migrations'
|
|
# Convert it to:
|
|
# 'project_base/db/migration/alembic_migrations/versions'
|
|
part1, part2 = script_location.split(':')
|
|
parts = part1.split('.') + part2.split('.') + ['versions']
|
|
# Return the absolute path to the versions dir
|
|
return os.path.join(root_dir, *parts)
|
|
|
|
|
|
def _get_head_file_path(config):
|
|
'''Return the path of the file that contains single head.'''
|
|
return os.path.join(
|
|
_get_root_versions_dir(config),
|
|
HEAD_FILENAME)
|
|
|
|
|
|
def _get_heads_file_path(config):
|
|
'''
|
|
Return the path of the file that was once used to maintain the list of
|
|
latest heads.
|
|
'''
|
|
return os.path.join(
|
|
_get_root_versions_dir(config),
|
|
HEADS_FILENAME)
|
|
|
|
|
|
def _get_contract_head_file_path(config):
|
|
'''
|
|
Return the path of the file that is used to maintain contract head
|
|
'''
|
|
return os.path.join(
|
|
_get_root_versions_dir(config),
|
|
CONTRACT_HEAD_FILENAME)
|
|
|
|
|
|
def _get_expand_head_file_path(config):
|
|
'''
|
|
Return the path of the file that is used to maintain expand head
|
|
'''
|
|
return os.path.join(
|
|
_get_root_versions_dir(config),
|
|
EXPAND_HEAD_FILENAME)
|
|
|
|
|
|
def _get_version_branch_path(config, release=None, branch=None):
|
|
version_path = _get_root_versions_dir(config)
|
|
if branch and release:
|
|
return os.path.join(version_path, release, branch)
|
|
return version_path
|
|
|
|
|
|
def _use_separate_migration_branches(config):
|
|
'''Detect whether split migration branches should be used.'''
|
|
if CONF.split_branches:
|
|
return True
|
|
|
|
script_dir = alembic_script.ScriptDirectory.from_config(config)
|
|
if _get_branch_points(script_dir):
|
|
return True
|
|
|
|
return False
|
|
|
|
|
|
def _set_version_locations(config):
|
|
'''Make alembic see all revisions in all migration branches.'''
|
|
split_branches = False
|
|
version_paths = [_get_version_branch_path(config)]
|
|
for release in RELEASES:
|
|
for branch in MIGRATION_BRANCHES:
|
|
version_path = _get_version_branch_path(config, release, branch)
|
|
if split_branches or os.path.exists(version_path):
|
|
split_branches = True
|
|
version_paths.append(version_path)
|
|
|
|
config.set_main_option('version_locations', ' '.join(version_paths))
|
|
|
|
|
|
def _get_installed_entrypoint(subproject):
|
|
'''Get the entrypoint for the subproject, which must be installed.'''
|
|
if subproject not in migration_entrypoints:
|
|
alembic_util.err(_('Package %s not installed') % subproject)
|
|
return migration_entrypoints[subproject]
|
|
|
|
|
|
def _get_subproject_script_location(subproject):
|
|
'''Get the script location for the installed subproject.'''
|
|
entrypoint = _get_installed_entrypoint(subproject)
|
|
return ':'.join([entrypoint.module_name, entrypoint.attrs[0]])
|
|
|
|
|
|
def _get_service_script_location(service):
|
|
'''Get the script location for the service, which must be installed.'''
|
|
return _get_subproject_script_location('neutron-%s' % service)
|
|
|
|
|
|
def _get_subproject_base(subproject):
|
|
'''Get the import base name for the installed subproject.'''
|
|
entrypoint = _get_installed_entrypoint(subproject)
|
|
return entrypoint.module_name.split('.')[0]
|
|
|
|
|
|
def get_alembic_version_table(config):
|
|
script_dir = alembic_script.ScriptDirectory.from_config(config)
|
|
alembic_version_table = [None]
|
|
|
|
def alembic_version_table_from_env(rev, context):
|
|
alembic_version_table[0] = context.version_table
|
|
return []
|
|
|
|
with environment.EnvironmentContext(config, script_dir,
|
|
fn=alembic_version_table_from_env):
|
|
script_dir.run_env()
|
|
|
|
return alembic_version_table[0]
|
|
|
|
|
|
def get_alembic_configs():
|
|
'''Return a list of alembic configs, one per project.
|
|
'''
|
|
|
|
# Get the script locations for the specified or installed projects.
|
|
# Which projects to get script locations for is determined by the CLI
|
|
# options as follows:
|
|
# --service X # only subproject neutron-X (deprecated)
|
|
# --subproject Y # only subproject Y (where Y can be neutron)
|
|
# (none specified) # neutron and all installed subprojects
|
|
script_locations = {}
|
|
if CONF.service:
|
|
script_location = _get_service_script_location(CONF.service)
|
|
script_locations['neutron-%s' % CONF.service] = script_location
|
|
elif CONF.subproject:
|
|
script_location = _get_subproject_script_location(CONF.subproject)
|
|
script_locations[CONF.subproject] = script_location
|
|
else:
|
|
for subproject, ep in migration_entrypoints.items():
|
|
script_locations[subproject] = _get_subproject_script_location(
|
|
subproject)
|
|
|
|
# Return a list of alembic configs from the projects in the
|
|
# script_locations dict. If neutron is in the list it is first.
|
|
configs = []
|
|
project_seq = sorted(script_locations.keys())
|
|
# Core neutron must be the first project if there is more than one
|
|
if len(project_seq) > 1 and 'neutron' in project_seq:
|
|
project_seq.insert(0, project_seq.pop(project_seq.index('neutron')))
|
|
for project in project_seq:
|
|
config = alembic_config.Config(neutron_alembic_ini)
|
|
config.set_main_option('neutron_project', project)
|
|
script_location = script_locations[project]
|
|
config.set_main_option('script_location', script_location)
|
|
_set_version_locations(config)
|
|
config.neutron_config = CONF
|
|
configs.append(config)
|
|
|
|
return configs
|
|
|
|
|
|
def get_neutron_config():
|
|
# Neutron's alembic config is always the first one
|
|
return get_alembic_configs()[0]
|
|
|
|
|
|
def run_sanity_checks(config, revision):
|
|
script_dir = alembic_script.ScriptDirectory.from_config(config)
|
|
|
|
def check_sanity(rev, context):
|
|
# TODO(ihrachyshka): here we use internal API for alembic; we may need
|
|
# alembic to expose implicit_base= argument into public
|
|
# iterate_revisions() call
|
|
for script in script_dir.revision_map.iterate_revisions(
|
|
revision, rev, implicit_base=True):
|
|
if hasattr(script.module, 'check_sanity'):
|
|
script.module.check_sanity(context.connection)
|
|
return []
|
|
|
|
with environment.EnvironmentContext(config, script_dir,
|
|
fn=check_sanity,
|
|
starting_rev=None,
|
|
destination_rev=revision):
|
|
script_dir.run_env()
|
|
|
|
|
|
def validate_cli_options():
|
|
if CONF.subproject and CONF.service:
|
|
alembic_util.err(_("Cannot specify both --service and --subproject."))
|
|
|
|
|
|
def get_engine_config():
|
|
return [obj for obj in _db_opts if obj.name == 'engine']
|
|
|
|
|
|
def main():
|
|
# Interpret the config file for Python logging.
|
|
# This line sets up loggers basically.
|
|
logging_config.fileConfig(neutron_alembic_ini)
|
|
|
|
CONF(project='neutron')
|
|
validate_cli_options()
|
|
return_val = False
|
|
for config in get_alembic_configs():
|
|
#TODO(gongysh) enable logging
|
|
return_val |= bool(CONF.command.func(config, CONF.command.name))
|
|
|
|
if CONF.command.name == 'has_offline_migrations' and not return_val:
|
|
alembic_util.msg(_('No offline migrations pending.'))
|
|
|
|
return return_val
|