8f0a303443
H302 violation is reported by flake8 when importing separated objects from
modules instead of importing the whole module.
e.g. from package.module import function
function()
is changed to
from package import module
module.function()
Change-Id: I83372124f4fba7b94bbfb4a56a0c0ef779ee237f
Partial-Bug: #1291032
61 lines
2.0 KiB
Python
61 lines
2.0 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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#
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# Copyright 2013 Brocade Communications System, Inc.
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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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#
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# Authors:
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# Shiv Haris (sharis@brocade.com)
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# Varma Bhupatiraju (vbhupati@#brocade.com)
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"""A Vlan Bitmap class to handle allocation/de-allocation of vlan ids."""
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from six import moves
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from neutron.common import constants
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from neutron.plugins.brocade.db import models as brocade_db
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MIN_VLAN = constants.MIN_VLAN_TAG + 1
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MAX_VLAN = constants.MAX_VLAN_TAG
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class VlanBitmap(object):
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"""Setup a vlan bitmap for allocation/de-allocation."""
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# Keep track of the vlans that have been allocated/de-allocated
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# uses a bitmap to do this
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def __init__(self, ctxt):
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"""Initialize the vlan as a set."""
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self.vlans = set(int(net['vlan'])
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for net in brocade_db.get_networks(ctxt)
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if net['vlan']
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)
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def get_next_vlan(self, vlan_id=None):
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"""Try to get a specific vlan if requested or get the next vlan."""
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min_vlan_search = vlan_id or MIN_VLAN
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max_vlan_search = (vlan_id and vlan_id + 1) or MAX_VLAN
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for vlan in moves.xrange(min_vlan_search, max_vlan_search):
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if vlan not in self.vlans:
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self.vlans.add(vlan)
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return vlan
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def release_vlan(self, vlan_id):
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"""Return the vlan to the pool."""
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if vlan_id in self.vlans:
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self.vlans.remove(vlan_id)
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