text: # vim: tabstop=4 shiftwidth=4 softtabstop=4
  
  # Copyright 2012 OpenStack LLC.
  # All Rights Reserved.
  #
  #    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.
  
  from sqlalchemy import Index, MetaData, Table
  from sqlalchemy.exc import IntegrityError
  
  
  def upgrade(migrate_engine):
      meta = MetaData()
      meta.bind = migrate_engine
  
      t = Table('fixed_ips', meta, autoload=True)
  
      # Based on network_get_all_by_host
      # from: nova/db/sqlalchemy/api.py
      i = Index('fixed_ips_host_idx', t.c.host)
      try:
          i.create(migrate_engine)
      except IntegrityError:
          pass
  
      # Based on fixed_ip_get_by_network_host
      # from: nova/db/sqlalchemy/api.py
      i = Index('fixed_ips_network_id_host_deleted_idx',
                t.c.network_id, t.c.host, t.c.deleted)
      try:
          i.create(migrate_engine)
      except IntegrityError:
          pass
  
      # Based on fixed_ip_associate
      # from: nova/db/sqlalchemy/api.py
      i = Index('fixed_ips_address_reserved_network_id_deleted_idx',
                t.c.address, t.c.reserved, t.c.network_id, t.c.deleted)
      try:
          i.create(migrate_engine)
      except IntegrityError:
          pass
  
  
  def downgrade(migrate_engine):
      meta = MetaData()
      meta.bind = migrate_engine
  
      t = Table('fixed_ips', meta, autoload=True)
  
      # Based on network_get_all_by_host
      # from: nova/db/sqlalchemy/api.py
      i = Index('fixed_ips_host_idx', t.c.host)
      i.drop(migrate_engine)
  
      # Based on fixed_ip_get_by_network_host
      # from: nova/db/sqlalchemy/api.py
      i = Index('fixed_ips_network_id_host_deleted_idx',
                t.c.network_id, t.c.host, t.c.deleted)
      i.drop(migrate_engine)
  
      # Based on fixed_ip_associate
      # from: nova/db/sqlalchemy/api.py
      i = Index('fixed_ips_address_reserved_network_id_deleted_idx',
                t.c.address, t.c.reserved, t.c.network_id, t.c.deleted)
      i.drop(migrate_engine)
  