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55 lines
1.8 KiB
Python
55 lines
1.8 KiB
Python
# decorators.py
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#
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# Copyright 2022 brombinmirko <send@mirko.pm>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, in version 3 of the License.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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from functools import lru_cache, wraps
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from time import monotonic_ns
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def cache(_func=None, *, seconds: int = 600, maxsize: int = 128, typed: bool = False):
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"""
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Extension of functools lru_cache with a timeout
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Parameters:
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seconds (int): Timeout in seconds to clear the WHOLE cache, default = 10 minutes
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maxsize (int): Maximum Size of the Cache
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typed (bool): Same value of different type will be a different entry
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Source: <https://gist.github.com/Morreski/c1d08a3afa4040815eafd3891e16b945>
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"""
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def wrapper_cache(f):
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f = lru_cache(maxsize=maxsize, typed=typed)(f)
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f.delta = seconds * 10**9
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f.expiration = monotonic_ns() + f.delta
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@wraps(f)
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def wrapped_f(*args, **kwargs):
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if monotonic_ns() >= f.expiration:
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f.cache_clear()
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f.expiration = monotonic_ns() + f.delta
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return f(*args, **kwargs)
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wrapped_f.cache_info = f.cache_info
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wrapped_f.cache_clear = f.cache_clear
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return wrapped_f
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# To allow decorator to be used without arguments
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if _func is None:
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return wrapper_cache
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else:
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return wrapper_cache(_func)
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