42 lines
1.4 KiB
Python
42 lines
1.4 KiB
Python
# Copyright 2016 Rackspace
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from functools import wraps
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from time import time
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from oslo_config import cfg
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import six
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CONF = cfg.CONF
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def memoize(func):
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"""Caches the result of a function call
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This is not intended to memoize functions with mutable arguments
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"""
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memoized_calls = {}
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@wraps(func)
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def decorate(*args, **kwargs):
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ttl = time() + CONF.user.token_ttl
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func_id = args, frozenset(list(six.iteritems(kwargs)))
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if memoized_calls.get(func_id):
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time_left = memoized_calls[func_id]["ttl"] - time()
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if time_left > 0:
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return memoized_calls[func_id]["ret_val"]
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memoized_calls[func_id] = {"ret_val": func(*args, **kwargs),
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"ttl": ttl}
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return memoized_calls[func_id]["ret_val"]
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return decorate
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