75 lines
2.4 KiB
Python
75 lines
2.4 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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class OVSCookieBridge(object):
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'''Bridge restricting flow operations to its own distinct cookie
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This class creates a bridge derived from a bridge passed at init (which
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has to inherit from OVSBridgeCookieMixin), but that has its own cookie,
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registered to the underlying bridge, and that will use this cookie in all
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flow operations.
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'''
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def __new__(cls, bridge):
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cookie_bridge = bridge.clone()
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cookie_bridge.set_agent_uuid_stamp(bridge.request_cookie())
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return cookie_bridge
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def __init__(self, bridge):
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pass
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class OVSAgentExtensionAPI(object):
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'''Implements the Agent API for Open vSwitch agent.
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Extensions can gain access to this API by overriding the consume_api
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method which has been added to the AgentExtension class.
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'''
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def __init__(self, int_br, tun_br, phys_brs=None):
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super(OVSAgentExtensionAPI, self).__init__()
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self.br_int = int_br
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self.br_tun = tun_br
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self.br_phys = phys_brs or {}
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def request_int_br(self):
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"""Allows extensions to request an integration bridge to use for
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extension specific flows.
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"""
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return OVSCookieBridge(self.br_int)
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def request_tun_br(self):
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"""Allows extensions to request a tunnel bridge to use for
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extension specific flows.
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If tunneling is not enabled, this method will return None.
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"""
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if not self.br_tun:
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return None
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return OVSCookieBridge(self.br_tun)
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def request_phy_brs(self):
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"""Allows extensions to request all physical bridges to use for
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extension specific flows.
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This a generator function which returns all existing physical bridges
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in the switch.
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"""
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for phy_br in self.br_phys.values():
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yield OVSCookieBridge(phy_br)
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