46 lines
1.8 KiB
Python
46 lines
1.8 KiB
Python
# 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 random
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from six import moves
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from kuryr.lib import constants as const
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from kuryr.lib import exceptions
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DEFAULT_MAX_RETRY_COUNT = 3
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class SegmentationDriver(object):
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def __init__(self):
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self.available_local_vlans = set(moves.range(const.MIN_VLAN_TAG,
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const.MAX_VLAN_TAG + 1))
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def allocate_segmentation_id(self, allocated_ids=set()):
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self.available_local_vlans.difference_update(allocated_ids)
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for i in range(DEFAULT_MAX_RETRY_COUNT):
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try:
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allocated = random.choice(list(self.available_local_vlans))
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self.available_local_vlans.remove(allocated)
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return allocated
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except IndexError:
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raise exceptions.SegmentationIdAllocationFailure('There are '
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'no vlan ids available.')
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except KeyError:
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# Other thread obtained the same vlan_id, so a new try is
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# needed
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continue
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raise exceptions.SegmentationIdAllocationFailure('Max number of '
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'retries reached without finding an available vlan id.')
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def release_segmentation_id(self, id):
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self.available_local_vlans.add(id)
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