OpenStack Study: type_local.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.

from neutron.common import exceptions as exc

from neutron.openstack.common import log

from neutron.plugins.common import constants as p_const

from neutron.plugins.ml2 import driver_api as api

LOG = log.getLogger(__name__)

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class LocalTypeDriver(api.TypeDriver):

"""Manage state for local networks with ML2.

The LocalTypeDriver implements the 'local' network_type. Local

network segments provide connectivity between VMs and other

devices running on the same node, provided that a common local

network bridging technology is available to those devices. Local

network segments do not provide any connectivity between nodes.

"""

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    def __init__(self):

        LOG.info(_("ML2 LocalTypeDriver initialization complete"))

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    def get_type(self):

        return p_const.TYPE_LOCAL

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    def initialize(self):

        pass

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    def validate_provider_segment(self, segment):

        for key, value in segment.iteritems():

            if value and key not in [api.NETWORK_TYPE]:

                msg = _("%s prohibited for local provider network") % key

                raise exc.InvalidInput(error_message=msg)

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    def reserve_provider_segment(self, session, segment):

        # No resources to reserve

        pass

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    def allocate_tenant_segment(self, session):

        # No resources to allocate

        return {api.NETWORK_TYPE: p_const.TYPE_LOCAL}

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    def release_segment(self, session, segment):

        # No resources to release

        pass