1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
# 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.
from neutron_lib.db import model_base
import sqlalchemy as sa
from sqlalchemy import orm
from neutron.db.models import agent as agent_model
LOWEST_BINDING_INDEX = 1
class NetworkDhcpAgentBinding(model_base.BASEV2):
"""Represents binding between neutron networks and DHCP agents."""
__table_args__ = (
sa.UniqueConstraint(
'network_id', 'binding_index',
name='uniq_network_dhcp_agent_binding0network_id0binding_index0'),
model_base.BASEV2.__table_args__
)
network_id = sa.Column(sa.String(36),
sa.ForeignKey("networks.id", ondelete='CASCADE'),
primary_key=True)
dhcp_agent = orm.relation(agent_model.Agent, lazy='subquery')
dhcp_agent_id = sa.Column(sa.String(36),
sa.ForeignKey("agents.id",
ondelete='CASCADE'),
primary_key=True)
binding_index = sa.Column(sa.Integer, nullable=False,
server_default=str(LOWEST_BINDING_INDEX))
|
