OpenStack Study: models.py

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# 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 neutron.db import model_base

from neutron.db import models_v2

from neutron.extensions import portbindings

BINDING_PROFILE_LEN = 4095

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class NetworkSegment(model_base.BASEV2, models_v2.HasId):

"""Represent persistent state of a network segment.

A network segment is a portion of a neutron network with a

specific physical realization. A neutron network can consist of

one or more segments.

"""

__tablename__ = 'ml2_network_segments'

network_id = sa.Column(sa.String(36),

sa.ForeignKey('networks.id', ondelete="CASCADE"),

nullable=False)

network_type = sa.Column(sa.String(32), nullable=False)

physical_network = sa.Column(sa.String(64))

segmentation_id = sa.Column(sa.Integer)

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class PortBinding(model_base.BASEV2):

"""Represent binding-related state of a port.

A port binding stores the port attributes required for the

portbindings extension, as well as internal ml2 state such as

which MechanismDriver and which segment are used by the port

binding.

"""

__tablename__ = 'ml2_port_bindings'

port_id = sa.Column(sa.String(36),

sa.ForeignKey('ports.id', ondelete="CASCADE"),

primary_key=True)