neutron/neutron/db/external_net_db.py
Bob Melander 715b16aca7 Adds support for L3 routing/NAT as a service plugin
- Adds L3 routing/NAT service plugin
- Removes L3 routing/NAT from ML2 plugin
- Moves "router:external" attribute to new extension "External-net"
- Introduces separate RPC topic for L3 callbacks from L3 agent

Implements: blueprint quantum-l3-routing-plugin

Change-Id: Id9af10c2910f9a1730b163203a68d101ffc3b282
2013-09-11 12:12:10 +02:00

158 lines
6.0 KiB
Python

# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright (c) 2013 OpenStack Foundation.
# 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 orm
from sqlalchemy.orm import exc
from sqlalchemy.sql import expression as expr
from neutron.api.v2 import attributes
from neutron.common import constants as l3_constants
from neutron.common import exceptions as q_exc
from neutron.db import db_base_plugin_v2
from neutron.db import model_base
from neutron.db import models_v2
from neutron.extensions import external_net
DEVICE_OWNER_ROUTER_GW = l3_constants.DEVICE_OWNER_ROUTER_GW
class ExternalNetwork(model_base.BASEV2):
network_id = sa.Column(sa.String(36),
sa.ForeignKey('networks.id', ondelete="CASCADE"),
primary_key=True)
# Add a relationship to the Network model in order to instruct
# SQLAlchemy to eagerly load this association
network = orm.relationship(
models_v2.Network,
backref=orm.backref("external", lazy='joined',
uselist=False, cascade='delete'))
class External_net_db_mixin(object):
"""Mixin class to add external network methods to db_plugin_base_v2."""
def _network_model_hook(self, context, original_model, query):
query = query.outerjoin(ExternalNetwork,
(original_model.id ==
ExternalNetwork.network_id))
return query
def _network_filter_hook(self, context, original_model, conditions):
if conditions is not None and not hasattr(conditions, '__iter__'):
conditions = (conditions, )
# Apply the external network filter only in non-admin context
if not context.is_admin and hasattr(original_model, 'tenant_id'):
conditions = expr.or_(ExternalNetwork.network_id != expr.null(),
*conditions)
return conditions
def _network_result_filter_hook(self, query, filters):
vals = filters and filters.get(external_net.EXTERNAL, [])
if not vals:
return query
if vals[0]:
return query.filter((ExternalNetwork.network_id != expr.null()))
return query.filter((ExternalNetwork.network_id == expr.null()))
# TODO(salvatore-orlando): Perform this operation without explicitly
# referring to db_base_plugin_v2, as plugins that do not extend from it
# might exist in the future
db_base_plugin_v2.NeutronDbPluginV2.register_model_query_hook(
models_v2.Network,
"external_net",
'_network_model_hook',
'_network_filter_hook',
'_network_result_filter_hook')
def _network_is_external(self, context, net_id):
try:
context.session.query(ExternalNetwork).filter_by(
network_id=net_id).one()
return True
except exc.NoResultFound:
return False
def _extend_network_dict_l3(self, network_res, network_db):
# Comparing with None for converting uuid into bool
network_res[external_net.EXTERNAL] = network_db.external is not None
return network_res
# Register dict extend functions for networks
db_base_plugin_v2.NeutronDbPluginV2.register_dict_extend_funcs(
attributes.NETWORKS, ['_extend_network_dict_l3'])
def _process_l3_create(self, context, net_data, req_data):
external = req_data.get(external_net.EXTERNAL)
external_set = attributes.is_attr_set(external)
if not external_set:
return
if external:
# expects to be called within a plugin's session
context.session.add(ExternalNetwork(network_id=net_data['id']))
net_data[external_net.EXTERNAL] = external
def _process_l3_update(self, context, net_data, req_data):
new_value = req_data.get(external_net.EXTERNAL)
net_id = net_data['id']
if not attributes.is_attr_set(new_value):
return
if net_data.get(external_net.EXTERNAL) == new_value:
return
if new_value:
context.session.add(ExternalNetwork(network_id=net_id))
net_data[external_net.EXTERNAL] = True
else:
# must make sure we do not have any external gateway ports
# (and thus, possible floating IPs) on this network before
# allow it to be update to external=False
port = context.session.query(models_v2.Port).filter_by(
device_owner=DEVICE_OWNER_ROUTER_GW,
network_id=net_data['id']).first()
if port:
raise external_net.ExternalNetworkInUse(net_id=net_id)
context.session.query(ExternalNetwork).filter_by(
network_id=net_id).delete()
net_data[external_net.EXTERNAL] = False
def _filter_nets_l3(self, context, nets, filters):
vals = filters and filters.get(external_net.EXTERNAL, [])
if not vals:
return nets
ext_nets = set(en['network_id']
for en in context.session.query(ExternalNetwork))
if vals[0]:
return [n for n in nets if n['id'] in ext_nets]
else:
return [n for n in nets if n['id'] not in ext_nets]
def get_external_network_id(self, context):
nets = self.get_networks(context, {external_net.EXTERNAL: [True]})
if len(nets) > 1:
raise q_exc.TooManyExternalNetworks()
else:
return nets[0]['id'] if nets else None