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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (c) 2017 Cisco and/or its affiliates.
#
# 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.
#
class FIBEntry:
def __init__(self, prefix, next_hops = None):
if next_hops is None:
next_hops = set()
self._prefix = prefix
self._next_hops = next_hops
def update(self, next_hops = None):
if not next_hops:
return
self._next_hops |= next_hops
def remove(self, next_hops = None):
if not next_hops:
return
self._next_hops &= next_hops
class FIB:
def __init__(self):
self._entries = dict()
def add(self, prefix, next_hops = None):
self._entries[prefix] = FIBEntry(prefix, next_hops)
def update(self, prefix, next_hops = None):
entry = self._entries.get(prefix)
if not entry:
raise Exception('prefix not found')
entry.update(next_hops)
def remove(self, prefix, next_hops = None):
if next_hop:
entry = self._entries.get(prefix)
if not entry:
raise Exception('prefix not found')
entry.remove(next_hops)
return
del self._entries[prefix]
def get(self, object_name):
for entry in self._entries.values():
if entry._prefix.object_name == object_name:
return next(iter(entry._next_hops))
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