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# Copyright 2013 VMware, Inc. 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.
#
import sqlalchemy as sa
from sqlalchemy import sql
from neutron.db import db_base_plugin_v2
from neutron.db import l3_db
from neutron.extensions import l3
from neutron.openstack.common import log as logging
LOG = logging.getLogger(__name__)
EXTERNAL_GW_INFO = l3.EXTERNAL_GW_INFO
# Modify the Router Data Model adding the enable_snat attribute
setattr(l3_db.Router, 'enable_snat',
sa.Column(sa.Boolean, default=True, server_default=sql.true(),
nullable=False))
class L3_NAT_dbonly_mixin(l3_db.L3_NAT_dbonly_mixin):
"""Mixin class to add configurable gateway modes."""
# Register dict extend functions for ports and networks
db_base_plugin_v2.NeutronDbPluginV2.register_dict_extend_funcs(
l3.ROUTERS, ['_extend_router_dict_gw_mode'])
def _extend_router_dict_gw_mode(self, router_res, router_db):
if router_db.gw_port_id:
nw_id = router_db.gw_port['network_id']
router_res[EXTERNAL_GW_INFO] = {
'network_id': nw_id,
'enable_snat': router_db.enable_snat}
def _update_router_gw_info(self, context, router_id, info, router=None):
# Load the router only if necessary
if not router:
router = self._get_router(context, router_id)
# if enable_snat is not specified use the value
# stored in the database (default:True)
enable_snat = not info or info.get('enable_snat', router.enable_snat)
with context.session.begin(subtransactions=True):
router.enable_snat = enable_snat
# Calls superclass, pass router db object for avoiding re-loading
super(L3_NAT_dbonly_mixin, self)._update_router_gw_info(
context, router_id, info, router=router)
# Returning the router might come back useful if this
# method is overridden in child classes
return router
def _build_routers_list(self, context, routers, gw_ports):
for rtr in routers:
gw_port_id = rtr['gw_port_id']
# Collect gw ports only if available
if gw_port_id and gw_ports.get(gw_port_id):
rtr['gw_port'] = gw_ports[gw_port_id]
# Add enable_snat key
rtr['enable_snat'] = rtr[EXTERNAL_GW_INFO]['enable_snat']
return routers
class L3_NAT_db_mixin(L3_NAT_dbonly_mixin, l3_db.L3_NAT_db_mixin):
pass
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