neutron/neutron/db/extradhcpopt_db.py
dekehn 77aee9e715 Adds delete of a extra_dhcp_opt on a port
Add support for delete of extra_dhcp_opt(s) on a port. Where
[{'opt_name': 'opt_to_delete', 'opt_value': None}].

Closes-Bug: #1228008

Change-Id: I75baeff91575cac6546fe2cc6fcf7a0d8e92853f
2013-11-14 14:36:01 -07:00

127 lines
5.4 KiB
Python

# 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.
#
# @author: Don Kehn, dekehn@gmail.com
#
import sqlalchemy as sa
from sqlalchemy import orm
from neutron.api.v2 import attributes
from neutron.db import db_base_plugin_v2
from neutron.db import model_base
from neutron.db import models_v2
from neutron.extensions import extra_dhcp_opt as edo_ext
from neutron.openstack.common import log as logging
LOG = logging.getLogger(__name__)
class ExtraDhcpOpt(model_base.BASEV2, models_v2.HasId):
"""Represent a generic concept of extra options associated to a port.
Each port may have none to many dhcp opts associated to it that can
define specifically different or extra options to DHCP clients.
These will be written to the <network_id>/opts files, and each option's
tag will be referenced in the <network_id>/host file.
"""
port_id = sa.Column(sa.String(36),
sa.ForeignKey('ports.id', ondelete="CASCADE"),
nullable=False)
opt_name = sa.Column(sa.String(64), nullable=False)
opt_value = sa.Column(sa.String(255), nullable=False)
__table_args__ = (sa.UniqueConstraint('port_id',
'opt_name',
name='uidx_portid_optname'),)
# Add a relationship to the Port model in order to instruct SQLAlchemy to
# eagerly load extra_dhcp_opts bindings
ports = orm.relationship(
models_v2.Port,
backref=orm.backref("dhcp_opts", lazy='joined', cascade='delete'))
class ExtraDhcpOptMixin(object):
"""Mixin class to add extra options to the DHCP opts file
and associate them to a port.
"""
def _process_port_create_extra_dhcp_opts(self, context, port,
extra_dhcp_opts):
if not extra_dhcp_opts:
return port
with context.session.begin(subtransactions=True):
for dopt in extra_dhcp_opts:
if dopt['opt_value']:
db = ExtraDhcpOpt(
port_id=port['id'],
opt_name=dopt['opt_name'],
opt_value=dopt['opt_value'])
context.session.add(db)
return self._extend_port_extra_dhcp_opts_dict(context, port)
def _extend_port_extra_dhcp_opts_dict(self, context, port):
port[edo_ext.EXTRADHCPOPTS] = self._get_port_extra_dhcp_opts_binding(
context, port['id'])
def _get_port_extra_dhcp_opts_binding(self, context, port_id):
query = self._model_query(context, ExtraDhcpOpt)
binding = query.filter(ExtraDhcpOpt.port_id == port_id)
return [{'opt_name': r.opt_name, 'opt_value': r.opt_value}
for r in binding]
def _update_extra_dhcp_opts_on_port(self, context, id, port,
updated_port=None):
# It is not necessary to update in a transaction, because
# its called from within one from ovs_neutron_plugin.
dopts = port['port'].get(edo_ext.EXTRADHCPOPTS)
if dopts:
opt_db = self._model_query(
context, ExtraDhcpOpt).filter_by(port_id=id).all()
# if there are currently no dhcp_options associated to
# this port, Then just insert the new ones and be done.
with context.session.begin(subtransactions=True):
for upd_rec in dopts:
for opt in opt_db:
if opt['opt_name'] == upd_rec['opt_name']:
# to handle deleting of a opt from the port.
if upd_rec['opt_value'] is None:
context.session.delete(opt)
elif opt['opt_value'] != upd_rec['opt_value']:
opt.update(
{'opt_value': upd_rec['opt_value']})
break
else:
if upd_rec['opt_value'] is not None:
db = ExtraDhcpOpt(
port_id=id,
opt_name=upd_rec['opt_name'],
opt_value=upd_rec['opt_value'])
context.session.add(db)
if updated_port:
edolist = self._get_port_extra_dhcp_opts_binding(context, id)
updated_port[edo_ext.EXTRADHCPOPTS] = edolist
return bool(dopts)
def _extend_port_dict_extra_dhcp_opt(self, res, port):
res[edo_ext.EXTRADHCPOPTS] = [{'opt_name': dho.opt_name,
'opt_value': dho.opt_value}
for dho in port.dhcp_opts]
return res
db_base_plugin_v2.NeutronDbPluginV2.register_dict_extend_funcs(
attributes.PORTS, ['_extend_port_dict_extra_dhcp_opt'])