ab44545a76
Define the Mechanism Driver interface for create/update/delete operations on networks and ports. For each of these event, the Mechanism Driver provides one method that is called within the database transaction of the ml2 plugin method, and one that is called after the transaction is completed. Support for mechanism drivers is still a work-in-progress, and the interface is subject to change in future versions before the release of Havana. However this initial version should be sufficient to enable others to start defining their own mechanism drivers. Change-Id: Ife30215589792ee27df9897d3b2bc04392638266 Implements: blueprint ml2-mechanism-drivers Fixes: bug #1199977 Fixes: bug #1199978 DocImpact
75 lines
2.6 KiB
Python
75 lines
2.6 KiB
Python
# Copyright (c) 2013 OpenStack Foundation
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from neutron.plugins.ml2 import driver_api as api
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class MechanismDriverContext(object):
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"""MechanismDriver context base class."""
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def __init__(self, plugin, plugin_context):
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self._plugin = plugin
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# This temporarily creates a reference loop, but the
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# lifetime of PortContext is limited to a single
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# method call of the plugin.
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self._plugin_context = plugin_context
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class NetworkContext(MechanismDriverContext, api.NetworkContext):
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def __init__(self, plugin, plugin_context, network,
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segments=None, original_network=None):
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super(NetworkContext, self).__init__(plugin, plugin_context)
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self._network = network
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self._original_network = original_network
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self._segments = segments
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def current(self):
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return self._network
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def original(self):
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return self._original_network
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def network_segments(self):
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if not self._segments:
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self._segments = self._plugin.get_network_segments(
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self._plugin_context, self._network['id'])
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return self._segments
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class PortContext(MechanismDriverContext, api.PortContext):
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def __init__(self, plugin, plugin_context, port,
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original_port=None):
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super(PortContext, self).__init__(plugin, plugin_context)
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self._port = port
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self._original_port = original_port
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self._network_context = None
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def current(self):
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return self._port
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def original(self):
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return self._original_port
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def network(self):
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"""Return the NetworkContext associated with this port."""
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if not self._network_context:
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network = self._plugin.get_network(self._plugin_context,
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self._port["network_id"])
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self._network_context = NetworkContext(self._plugin,
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self._plugin_context,
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network)
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return self._network_context
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