Mercurial > libervia-backend

annotate sat/tools/common/async_utils.py @ 3886:1f88ca90c3de

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
plugin XEP-0444: Message Reactions implementation: rel 371
author Goffi <goffi@goffi.org>
date Wed, 31 Aug 2022 17:07:03 +0200
parents 9b45f0f168cf
children ebe45ea2df3b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3725
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
1 #!/usr/bin/env python3
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
2
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
3
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
4 # Libervia: an XMPP client
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
5 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
6
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
7 # This program is free software: you can redistribute it and/or modify
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
8 # it under the terms of the GNU Affero General Public License as published by
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
9 # the Free Software Foundation, either version 3 of the License, or
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
10 # (at your option) any later version.
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
11
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
12 # This program is distributed in the hope that it will be useful,
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
15 # GNU Affero General Public License for more details.
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
16
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
17 # You should have received a copy of the GNU Affero General Public License
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
19
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
20 """tools to launch process in a async way (using Twisted)"""
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
21
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
22 from collections import OrderedDict
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
23 from typing import Optional, Callable, Awaitable
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
24 from sat.core.log import getLogger
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
25
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
26
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
27 log = getLogger(__name__)
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
28
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
29
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
30 def async_lru(maxsize: Optional[int] = None) -> Callable:
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
31 """Decorator to cache async function results using LRU algorithm"""
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
32 def decorator(func: Callable) -> Callable:
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
33 cache = OrderedDict()
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
34 async def wrapper(*args) -> Awaitable:
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
35 if args in cache:
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
36 log.debug(f"using result in cache for {args}")
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
37 cache.move_to_end(args)
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
38 result = cache[args]
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
39 return result
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
40 log.debug(f"caching result for {args}")
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
41 result = await func(*args)
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
42 cache[args] = result
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
43 if maxsize is not None and len(cache) > maxsize:
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
44 value = cache.popitem(False)
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
45 log.debug(f"Removing LRU value: {value}")
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
46 return result
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
47 return wrapper
9b45f0f168cf tools (common): new `async_utils` module with an async version of `lru_cache`
Goffi <goffi@goffi.org>
parents:
diff changeset
48 return decorator