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annotate sat/tools/common/async_utils.py @ 3913:944f51f9c2b4

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core (xmpp): make `send` a blocking method, fix `sendMessageData` calls: original `send` method is blocking, and it is used as such by Wokkel and thus can't be changed to an async method easily. However, an Async method is necessary to have an async trigger at the very end of the send workflow for end-to-end encryption. To workaround that, `send` is an async method which call `a_send`, an async method which actually does the sending. This way legacy method can still call `send` while `a_send` can be await otherwise. Fix calls to `sendMessageData`: the method now being an `async` one, `ensureDeferred` had to be used in some calls.
author Goffi <goffi@goffi.org>
date Sat, 24 Sep 2022 16:31:39 +0200
parents 9b45f0f168cf
children ebe45ea2df3b
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1 #!/usr/bin/env python3
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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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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