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annotate sat/tools/common/async_utils.py @ 3725:9b45f0f168cf

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tools (common): new `async_utils` module with an async version of `lru_cache`
author Goffi <goffi@goffi.org>
date Tue, 25 Jan 2022 17:25:10 +0100
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children ebe45ea2df3b
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3725
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
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1 #!/usr/bin/env python3
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3
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4 # Libervia: an XMPP client
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5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 """tools to launch process in a async way (using Twisted)"""
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21
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22 from collections import OrderedDict
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23 from typing import Optional, Callable, Awaitable
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24 from sat.core.log import getLogger
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27 log = getLogger(__name__)
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30 def async_lru(maxsize: Optional[int] = None) -> Callable:
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31 """Decorator to cache async function results using LRU algorithm"""
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32 def decorator(func: Callable) -> Callable:
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33 cache = OrderedDict()
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34 async def wrapper(*args) -> Awaitable:
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35 if args in cache:
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36 log.debug(f"using result in cache for {args}")
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37 cache.move_to_end(args)
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38 result = cache[args]
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39 return result
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40 log.debug(f"caching result for {args}")
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41 result = await func(*args)
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42 cache[args] = result
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43 if maxsize is not None and len(cache) > maxsize:
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44 value = cache.popitem(False)
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45 log.debug(f"Removing LRU value: {value}")
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46 return result
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47 return wrapper
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48 return decorator