/usr/share/pyshared/melange/mac/db_based_mac_generator/generator.py is in python-melange 1:2012.1-3.
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# Copyright 2012 OpenStack LLC.
# 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 db_based_ip_generator.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 melange.db import db_api
from melange.mac.db_based_mac_generator import models
class DbBasedMacGenerator(object):
def __init__(self, mac_range):
self.mac_range = mac_range
def next_mac(self):
allocatable_address = db_api.pop_allocatable_address(
models.AllocatableMac, mac_address_range_id=self.mac_range.id)
if allocatable_address is not None:
return allocatable_address
address = self._next_eligible_address()
self.mac_range.update(next_address=address + 1)
return address
def _next_eligible_address(self):
return self.mac_range.next_address or self.mac_range.first_address()
def is_full(self):
return self._next_eligible_address() > self.mac_range.last_address()
def mac_removed(self, address):
models.AllocatableMac.create(
mac_address_range_id=self.mac_range.id,
address=address)
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