text: # 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 sqlalchemy as sql
  
  from keystone.common.sql import migration_helpers
  
  
  def upgrade(migrate_engine):
      try:
          extension_version = migration_helpers.get_db_version(
              extension='endpoint_filter',
              engine=migrate_engine)
      except Exception:
          extension_version = 0
  
      # This migration corresponds to endpoint_filter extension migration 2. Only
      # update if it has not been run.
      if extension_version >= 2:
          return
  
      # Upgrade operations go here. Don't create your own engine; bind
      # migrate_engine to your metadata
      meta = sql.MetaData()
      meta.bind = migrate_engine
  
      EP_GROUP_ID = 'endpoint_group_id'
      PROJECT_ID = 'project_id'
  
      endpoint_filtering_table = sql.Table(
          'project_endpoint',
          meta,
          sql.Column(
              'endpoint_id',
              sql.String(64),
              primary_key=True,
              nullable=False),
          sql.Column(
              'project_id',
              sql.String(64),
              primary_key=True,
              nullable=False))
      endpoint_filtering_table.create(migrate_engine, checkfirst=True)
  
      endpoint_group_table = sql.Table(
          'endpoint_group',
          meta,
          sql.Column('id', sql.String(64), primary_key=True),
          sql.Column('name', sql.String(255), nullable=False),
          sql.Column('description', sql.Text, nullable=True),
          sql.Column('filters', sql.Text(), nullable=False))
      endpoint_group_table.create(migrate_engine, checkfirst=True)
  
      project_endpoint_group_table = sql.Table(
          'project_endpoint_group',
          meta,
          sql.Column(EP_GROUP_ID, sql.String(64),
                     sql.ForeignKey('endpoint_group.id'), nullable=False),
          sql.Column(PROJECT_ID, sql.String(64), nullable=False),
          sql.PrimaryKeyConstraint(EP_GROUP_ID, PROJECT_ID))
      project_endpoint_group_table.create(migrate_engine, checkfirst=True)
  