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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import json
import sqlalchemy as sql
from keystone.common.sql import migration_helpers
_PROJECT_TABLE_NAME = 'project'
_DOMAIN_TABLE_NAME = 'domain'
_PARENT_ID_COLUMN_NAME = 'parent_id'
_DOMAIN_ID_COLUMN_NAME = 'domain_id'
# Above the driver level, the domain_id of a project acting as a domain is
# None. However, in order to enable sql integrity constraints to still operate
# on this column, we create a special "root of all domains" row, with an ID of
# NULL_DOMAIN_ID, which all projects acting as a domain reference in their
# domain_id attribute. This special row, as well as NULL_DOMAIN_ID, are never
# exposed outside of sql driver layer.
NULL_DOMAIN_ID = '<<keystone.domain.root>>'
def list_existing_project_constraints(project_table, domain_table):
constraints = [{'table': project_table,
'fk_column': _PARENT_ID_COLUMN_NAME,
'ref_column': project_table.c.id},
{'table': project_table,
'fk_column': _DOMAIN_ID_COLUMN_NAME,
'ref_column': domain_table.c.id}]
return constraints
def list_new_project_constraints(project_table):
constraints = [{'table': project_table,
'fk_column': _PARENT_ID_COLUMN_NAME,
'ref_column': project_table.c.id},
{'table': project_table,
'fk_column': _DOMAIN_ID_COLUMN_NAME,
'ref_column': project_table.c.id}]
return constraints
def upgrade(migrate_engine):
def _project_from_domain(domain):
# Creates a project dict with is_domain=True from the provided
# domain.
description = None
extra = {}
if domain.extra is not None:
# 'description' property is an extra attribute in domains but a
# first class attribute in projects
extra = json.loads(domain.extra)
description = extra.pop('description', None)
return {
'id': domain.id,
'name': domain.name,
'enabled': domain.enabled,
'description': description,
'domain_id': NULL_DOMAIN_ID,
'is_domain': True,
'parent_id': None,
'extra': json.dumps(extra)
}
meta = sql.MetaData()
meta.bind = migrate_engine
session = sql.orm.sessionmaker(bind=migrate_engine)()
project_table = sql.Table(_PROJECT_TABLE_NAME, meta, autoload=True)
domain_table = sql.Table(_DOMAIN_TABLE_NAME, meta, autoload=True)
# NOTE(htruta): Remove the parent_id constraint during the migration
# because for every root project inside this domain, we will set
# the project domain_id to be its parent_id. We re-enable the constraint
# in the end of this method. We also remove the domain_id constraint,
# while be recreated a FK to the project_id at the end.
migration_helpers.remove_constraints(
list_existing_project_constraints(project_table, domain_table))
# For each domain, create a project acting as a domain. We ignore the
# "root of all domains" row, since we already have one of these in the
# project table.
domains = list(domain_table.select().execute())
for domain in domains:
if domain.id == NULL_DOMAIN_ID:
continue
is_domain_project = _project_from_domain(domain)
new_entry = project_table.insert().values(**is_domain_project)
session.execute(new_entry)
session.commit()
# For each project, that has no parent (i.e. a top level project), update
# it's parent_id to point at the project acting as its domain. We ignore
# the "root of all domains" row, since its parent_id must always be None.
projects = list(project_table.select().execute())
for project in projects:
if (project.parent_id is not None or project.is_domain or
project.id == NULL_DOMAIN_ID):
continue
values = {'parent_id': project.domain_id}
update = project_table.update().where(
project_table.c.id == project.id).values(values)
session.execute(update)
session.commit()
migration_helpers.add_constraints(
list_new_project_constraints(project_table))
session.close()
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