61 lines
2.1 KiB
Python
61 lines
2.1 KiB
Python
# Copyright 2016 Intel Corporation.
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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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import copy
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from neutron.agent.common import ovs_lib
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class OVSBridgeCookieMixin(object):
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'''Mixin to provide cookie retention functionality
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to the OVSAgentBridge
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'''
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def __init__(self, *args, **kwargs):
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super(OVSBridgeCookieMixin, self).__init__(*args, **kwargs)
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self._reserved_cookies = set()
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@property
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def reserved_cookies(self):
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if self._default_cookie not in self._reserved_cookies:
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self._reserved_cookies.add(self._default_cookie)
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return set(self._reserved_cookies)
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def request_cookie(self):
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if self._default_cookie not in self._reserved_cookies:
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self._reserved_cookies.add(self._default_cookie)
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uuid_stamp = ovs_lib.generate_random_cookie()
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while uuid_stamp in self._reserved_cookies:
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uuid_stamp = ovs_lib.generate_random_cookie()
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self._reserved_cookies.add(uuid_stamp)
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return uuid_stamp
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def unset_cookie(self, cookie):
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self._reserved_cookies.discard(cookie)
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def set_agent_uuid_stamp(self, val):
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self._reserved_cookies.add(val)
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if self._default_cookie in self._reserved_cookies:
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self._reserved_cookies.remove(self._default_cookie)
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super(OVSBridgeCookieMixin, self).set_agent_uuid_stamp(val)
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def clone(self):
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'''Used by OVSCookieBridge, can be overridden by subclasses if a
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behavior different from copy.copy is needed.
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'''
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return copy.copy(self)
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