55 lines
1.6 KiB
Python
55 lines
1.6 KiB
Python
# -*- coding: utf-8 -*-
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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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import collections
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from delimiter import exceptions
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from delimiter import processor
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BoundedResource = collections.namedtuple('BoundedResource',
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['consumed', 'bound'])
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class UpperBoundProcessor(processor.Processor):
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"""Processes a limit given some upper bound."""
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@staticmethod
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def create(limit):
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return {
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'consumed': 0,
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'bound': limit,
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}
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@staticmethod
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def decode(details):
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return BoundedResource(details['consumed'], details['bound'])
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@staticmethod
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def update(details, limit):
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details = details.copy()
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details['bound'] = limit
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return details
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@staticmethod
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def process(details, amount):
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consumed = details['consumed']
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if consumed + amount > details['bound']:
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raise exceptions.OverLimitException(
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"Limit of '%s' can not be passed" % details['bound'])
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else:
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details = details.copy()
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details['consumed'] = consumed + amount
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return details
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