text: # Copyright 2014 OpenStack Foundation
  #
  #    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.
  #
  
  """ml2_tunnel_endpoints_table
  
  Revision ID: 38495dc99731
  Revises: 57086602ca0a
  Create Date: 2014-12-22 00:03:33.643799
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '38495dc99731'
  down_revision = '57086602ca0a'
  
  from alembic import op
  import sqlalchemy as sa
  
  CONSTRAINT_NAME_GRE = 'unique_ml2_gre_endpoints0host'
  CONSTRAINT_NAME_VXLAN = 'unique_ml2_vxlan_endpoints0host'
  
  
  def upgrade():
  
      op.add_column('ml2_gre_endpoints',
                    sa.Column('host', sa.String(length=255), nullable=True))
      op.create_unique_constraint(
          constraint_name=CONSTRAINT_NAME_GRE,
          table_name='ml2_gre_endpoints',
          columns=['host']
      )
  
      op.add_column('ml2_vxlan_endpoints',
                    sa.Column('host', sa.String(length=255), nullable=True))
      op.create_unique_constraint(
          constraint_name=CONSTRAINT_NAME_VXLAN,
          table_name='ml2_vxlan_endpoints',
          columns=['host']
      )
  