old_contents: # Copyright 2015 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.
  #
  
  """add_unique_ha_router_agent_port_bindings
  
  Revision ID: 1df244e556f5
  Revises: 34af2b5c5a59
  Create Date: 2015-10-02 18:06:01.696742
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '1df244e556f5'
  down_revision = '659bf3d90664'
  
  from alembic import op
  import sqlalchemy as sa
  
  from neutron._i18n import _
  
  from neutron.common import exceptions
  
  UNIQUE_NAME = 'uniq_ha_router_agent_port_bindings0port_id0l3_agent_id'
  TABLE_NAME = 'ha_router_agent_port_bindings'
  
  ha_router_agent_port_bindings = sa.Table(
      'ha_router_agent_port_bindings', sa.MetaData(),
      sa.Column('port_id', sa.String(36)),
      sa.Column('router_id', sa.String(36)),
      sa.Column('l3_agent_id', sa.String(36)))
  
  
  class DuplicateL3HARouterAgentPortBinding(exceptions.Conflict):
      message = _("Duplicate L3HARouterAgentPortBinding is created for "
                  "router(s) %(router)s. Database cannot be upgraded. Please, "
                  "remove all duplicates before upgrading the database.")
  
  
  def upgrade():
      op.create_unique_constraint(UNIQUE_NAME, TABLE_NAME,
                                  ['router_id', 'l3_agent_id'])
  
  
  def check_sanity(connection):
      res = get_duplicate_l3_ha_port_bindings(connection)
      if res:
          raise DuplicateL3HARouterAgentPortBinding(router=", ".join(res))
  
  
  def get_duplicate_l3_ha_port_bindings(connection):
      insp = sa.engine.reflection.Inspector.from_engine(connection)
      if 'ha_router_agent_port_bindings' not in insp.get_table_names():
          return {}
      session = sa.orm.Session(bind=connection.connect())
      query = (session.query(ha_router_agent_port_bindings)
               .group_by(ha_router_agent_port_bindings.c.router_id,
                         ha_router_agent_port_bindings.c.l3_agent_id)
               .having(sa.func.count() > 1)).all()
      return [q.router_id for q in query]
  
new_contents: # Copyright 2015 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.
  #
  
  """add_unique_ha_router_agent_port_bindings
  
  Revision ID: 1df244e556f5
  Revises: 34af2b5c5a59
  Create Date: 2015-10-02 18:06:01.696742
  
  """
  
  # revision identifiers, used by Alembic.
  revision = '1df244e556f5'
  down_revision = '659bf3d90664'
  
  from alembic import op
  import sqlalchemy as sa
  
  from neutron._i18n import _
  
  from neutron.common import exceptions
  
  UNIQUE_NAME = 'uniq_ha_router_agent_port_bindings0port_id0l3_agent_id'
  TABLE_NAME = 'ha_router_agent_port_bindings'
  
  ha_router_agent_port_bindings = sa.Table(
      'ha_router_agent_port_bindings', sa.MetaData(),
      sa.Column('port_id', sa.String(36)),
      sa.Column('router_id', sa.String(36)),
      sa.Column('l3_agent_id', sa.String(36)))
  
  
  class DuplicateL3HARouterAgentPortBinding(exceptions.Conflict):
      message = _("Duplicate L3HARouterAgentPortBinding is created for "
                  "router(s) %(router)s. Database cannot be upgraded. Please, "
                  "remove all duplicates before upgrading the database.")
  
  
  def upgrade():
      op.create_unique_constraint(UNIQUE_NAME, TABLE_NAME,
                                  ['router_id', 'l3_agent_id'])
  
  
  def check_sanity(connection):
      res = get_duplicate_l3_ha_port_bindings(connection)
      if res:
          raise DuplicateL3HARouterAgentPortBinding(router=", ".join(res))
  
  
  def get_duplicate_l3_ha_port_bindings(connection):
      insp = sa.engine.reflection.Inspector.from_engine(connection)
      if 'ha_router_agent_port_bindings' not in insp.get_table_names():
          return {}
      session = sa.orm.Session(bind=connection.connect())
      query = (session.query(ha_router_agent_port_bindings.c.router_id)
               .group_by(ha_router_agent_port_bindings.c.router_id,
                         ha_router_agent_port_bindings.c.l3_agent_id)
               .having(sa.func.count() > 1)).all()
      return [q[0] for q in query]
  
subject: Fix GROUP BY usage for PostgreSQL in migrations