libervia-backend: libervia/backend/memory/cache.py annotate

annotate libervia/backend/memory/cache.py @ 4259:49019947cc76

component AP Gateway: implement HTTP GET signature.

author	Goffi <goffi@goffi.org>
date	Wed, 05 Jun 2024 22:34:09 +0200
parents	e11b13418ba6
children

rev	line source
3028 ab2696e34d29 Python 3 port: Goffi <goffi@goffi.org> parents: 2771 diff changeset	1 #!/usr/bin/env python3
3137 559a625a236b fixed shebangs Goffi <goffi@goffi.org> parents: 3136 diff changeset	2
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	3 # Libervia: an XMPP client
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	4 # Copyright (C) 2009-2024 Jérôme Poisson (goffi@goffi.org)
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	5
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	6 # This program is free software: you can redistribute it and/or modify
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	7 # it under the terms of the GNU Affero General Public License as published by
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	8 # the Free Software Foundation, either version 3 of the License, or
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	9 # (at your option) any later version.
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	10
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	11 # This program is distributed in the hope that it will be useful,
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	14 # GNU Affero General Public License for more details.
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	15
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	16 # You should have received a copy of the GNU Affero General Public License
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	17 # along with this program. If not, see <http://www.gnu.org/licenses/>.
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	18
3818 2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	19 from io import BufferedIOBase
3185 554b3b632378 memory (cache): purge + pathlib: Goffi <goffi@goffi.org> parents: 3137 diff changeset	20 import mimetypes
3818 2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	21 from pathlib import Path
3185 554b3b632378 memory (cache): purge + pathlib: Goffi <goffi@goffi.org> parents: 3137 diff changeset	22 import time
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	23 from typing import Any
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	24
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	25 from pydantic import BaseModel, ValidationError
3818 2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	26
4071 4b842c1fb686 refactoring: renamed `sat` package to `libervia.backend` Goffi <goffi@goffi.org> parents: 4037 diff changeset	27 from libervia.backend.core import exceptions
4b842c1fb686 refactoring: renamed `sat` package to `libervia.backend` Goffi <goffi@goffi.org> parents: 4037 diff changeset	28 from libervia.backend.core.constants import Const as C
4b842c1fb686 refactoring: renamed `sat` package to `libervia.backend` Goffi <goffi@goffi.org> parents: 4037 diff changeset	29 from libervia.backend.core.i18n import _
4b842c1fb686 refactoring: renamed `sat` package to `libervia.backend` Goffi <goffi@goffi.org> parents: 4037 diff changeset	30 from libervia.backend.core.log import getLogger
4b842c1fb686 refactoring: renamed `sat` package to `libervia.backend` Goffi <goffi@goffi.org> parents: 4037 diff changeset	31 from libervia.backend.tools.common import regex
3185 554b3b632378 memory (cache): purge + pathlib: Goffi <goffi@goffi.org> parents: 3137 diff changeset	32
2624 56f94936df1e code style reformatting using black Goffi <goffi@goffi.org> parents: 2562 diff changeset	33
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	34 log = getLogger(__name__)
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	35
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	36 CACHE_METADATA_EXT = ".cache.json"
2624 56f94936df1e code style reformatting using black Goffi <goffi@goffi.org> parents: 2562 diff changeset	37 DEFAULT_EXT = ".raw"
2509 d485e9416493 core (memory/cache): common cache: Goffi <goffi@goffi.org> parents: 2506 diff changeset	38
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	39
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	40 class CacheMetadata(BaseModel):
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	41 source: str
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	42 uid: str
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	43 filename: str
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	44 creation: int
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	45 eol: int
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	46 max_age: int = C.DEFAULT_MAX_AGE
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	47 original_filename: str \| None = None
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	48 mime_type: str \| None = None
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	49 last_access: int \| None = None
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	50
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	51
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	52 class Cache:
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	53 """Generic file caching."""
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	54
2509 d485e9416493 core (memory/cache): common cache: Goffi <goffi@goffi.org> parents: 2506 diff changeset	55 def __init__(self, host, profile):
d485e9416493 core (memory/cache): common cache: Goffi <goffi@goffi.org> parents: 2506 diff changeset	56 """
3818 2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	57 @param profile(unicode, None): name of the profile to set the cache for
2509 d485e9416493 core (memory/cache): common cache: Goffi <goffi@goffi.org> parents: 2506 diff changeset	58 if None, the cache will be common for all profiles
d485e9416493 core (memory/cache): common cache: Goffi <goffi@goffi.org> parents: 2506 diff changeset	59 """
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	60 self.profile = profile
4037 524856bd7b19 massive refactoring to switch from camelCase to snake_case: Goffi <goffi@goffi.org> parents: 3818 diff changeset	61 path_elts = [host.memory.config_get("", "local_dir"), C.CACHE_DIR]
2509 d485e9416493 core (memory/cache): common cache: Goffi <goffi@goffi.org> parents: 2506 diff changeset	62 if profile:
4037 524856bd7b19 massive refactoring to switch from camelCase to snake_case: Goffi <goffi@goffi.org> parents: 3818 diff changeset	63 path_elts.extend(["profiles", regex.path_escape(profile)])
2509 d485e9416493 core (memory/cache): common cache: Goffi <goffi@goffi.org> parents: 2506 diff changeset	64 else:
3028 ab2696e34d29 Python 3 port: Goffi <goffi@goffi.org> parents: 2771 diff changeset	65 path_elts.append("common")
3185 554b3b632378 memory (cache): purge + pathlib: Goffi <goffi@goffi.org> parents: 3137 diff changeset	66 self.cache_dir = Path(*path_elts)
554b3b632378 memory (cache): purge + pathlib: Goffi <goffi@goffi.org> parents: 3137 diff changeset	67
554b3b632378 memory (cache): purge + pathlib: Goffi <goffi@goffi.org> parents: 3137 diff changeset	68 self.cache_dir.mkdir(0o700, parents=True, exist_ok=True)
554b3b632378 memory (cache): purge + pathlib: Goffi <goffi@goffi.org> parents: 3137 diff changeset	69 self.purge()
2509 d485e9416493 core (memory/cache): common cache: Goffi <goffi@goffi.org> parents: 2506 diff changeset	70
3185 554b3b632378 memory (cache): purge + pathlib: Goffi <goffi@goffi.org> parents: 3137 diff changeset	71 def purge(self):
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	72 # Remove expired, unreadable, and unrelated files from cache
3185 554b3b632378 memory (cache): purge + pathlib: Goffi <goffi@goffi.org> parents: 3137 diff changeset	73 # TODO: this should not be called only on startup, but at regular interval
554b3b632378 memory (cache): purge + pathlib: Goffi <goffi@goffi.org> parents: 3137 diff changeset	74 # (e.g. once a day)
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	75 to_delete = set()
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	76 seen = set()
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	77 now = time.time()
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	78 for cache_data_file in self.cache_dir.glob(f"*{CACHE_METADATA_EXT}"):
3185 554b3b632378 memory (cache): purge + pathlib: Goffi <goffi@goffi.org> parents: 3137 diff changeset	79 try:
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	80 with cache_data_file.open("r") as f:
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	81 cache_data = CacheMetadata.model_validate_json(f.read())
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	82 except (IOError, ValidationError):
3185 554b3b632378 memory (cache): purge + pathlib: Goffi <goffi@goffi.org> parents: 3137 diff changeset	83 log.warning(
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	84 _("Can't read metadata file at {path}, deleting it.").format(
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	85 path=cache_data_file
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	86 )
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	87 )
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	88 to_delete.add(cache_data_file)
3185 554b3b632378 memory (cache): purge + pathlib: Goffi <goffi@goffi.org> parents: 3137 diff changeset	89 continue
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	90 else:
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	91 cached_file = self.get_path(cache_data.filename)
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	92 if not cached_file.exists():
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	93 log.warning(
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	94 f"Cache file {cache_data_file!r} references a non-existent file "
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	95 f"and will be deleted: {cache_data_file!r}."
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	96 )
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	97 to_delete.add(cache_data_file)
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	98 elif cache_data.eol < now:
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	99 log.debug(
4231 e11b13418ba6 plugin XEP-0353, XEP-0234, jingle: WebRTC data channel signaling implementation: Goffi <goffi@goffi.org> parents: 4212 diff changeset	100 f"Purging expired cache file {cache_data_file} (expired for "
e11b13418ba6 plugin XEP-0353, XEP-0234, jingle: WebRTC data channel signaling implementation: Goffi <goffi@goffi.org> parents: 4212 diff changeset	101 f"{int(time.time() - cache_data.eol)}s)"
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	102 )
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	103 to_delete.add(cache_data_file)
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	104 seen.add(cached_file)
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	105 seen.add(cache_data_file)
3185 554b3b632378 memory (cache): purge + pathlib: Goffi <goffi@goffi.org> parents: 3137 diff changeset	106
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	107 for file in to_delete:
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	108 log.debug(f"Deleting cache file: {file}")
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	109 file.unlink()
3209 f14eb24328d0 core (memory/cache): purge cache metadata when the referenced file doesn't exist Goffi <goffi@goffi.org> parents: 3198 diff changeset	110
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	111 for file in self.cache_dir.iterdir():
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	112 if file not in seen:
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	113 log.debug(f"Deleting irrelevant file in cache dir: {file}")
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	114 file.unlink()
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	115
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	116 def get_path(self, filename: str) -> Path:
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	117 """Return cached file URL.
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	118
3818 2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	119 @param filename: cached file name (cache data or actual file)
2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	120 @return: path to the cached file
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	121 """
3028 ab2696e34d29 Python 3 port: Goffi <goffi@goffi.org> parents: 2771 diff changeset	122 if not filename or "/" in filename:
2624 56f94936df1e code style reformatting using black Goffi <goffi@goffi.org> parents: 2562 diff changeset	123 log.error(
3028 ab2696e34d29 Python 3 port: Goffi <goffi@goffi.org> parents: 2771 diff changeset	124 "invalid char found in file name, hack attempt? name:{}".format(filename)
2624 56f94936df1e code style reformatting using black Goffi <goffi@goffi.org> parents: 2562 diff changeset	125 )
3028 ab2696e34d29 Python 3 port: Goffi <goffi@goffi.org> parents: 2771 diff changeset	126 raise exceptions.DataError("Invalid char found")
3185 554b3b632378 memory (cache): purge + pathlib: Goffi <goffi@goffi.org> parents: 3137 diff changeset	127 return self.cache_dir / filename
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	128
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	129 def get_metadata(self, uid: str, update_eol: bool = True) -> dict[str, Any] \| None:
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	130 """Retrieve metadata for cached data.
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	131
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	132 @param uid: unique identifier of cache metadata.
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	133 @param update_eol: True if eol must extended
3188 a15773c6c273 memory(cache): extend EOL when a file metadata is retrieved Goffi <goffi@goffi.org> parents: 3185 diff changeset	134 if True, max_age will be added to eol (only if it is not already expired)
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	135 @return: metadata, see [cache_data] for data details, an additional "path" key is
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	136 the full path to cached file.
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	137 None if file is not in cache (or cache is invalid).
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	138 """
2116 766dbbec56f2 core (memory/cache): geFilePath now return None when uid is empty Goffi <goffi@goffi.org> parents: 2109 diff changeset	139 uid = uid.strip()
766dbbec56f2 core (memory/cache): geFilePath now return None when uid is empty Goffi <goffi@goffi.org> parents: 2109 diff changeset	140 if not uid:
3028 ab2696e34d29 Python 3 port: Goffi <goffi@goffi.org> parents: 2771 diff changeset	141 raise exceptions.InternalError("uid must not be empty")
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	142 cache_url = self.get_path(f"{uid}{CACHE_METADATA_EXT}")
3188 a15773c6c273 memory(cache): extend EOL when a file metadata is retrieved Goffi <goffi@goffi.org> parents: 3185 diff changeset	143 if not cache_url.exists():
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	144 return None
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	145
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	146 try:
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	147 with cache_url.open("r") as f:
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	148 cache_data = CacheMetadata.model_validate_json(f.read())
3572 b3fa179417e7 core (memory/cache): don't crash on EOFError in getMetadata Goffi <goffi@goffi.org> parents: 3479 diff changeset	149 except (IOError, EOFError) as e:
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	150 log.warning(f"Can't read cache at {cache_url}: {e}")
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	151 return None
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	152 except ValidationError:
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	153 log.warning(f"Invalid cache found at {cache_url}")
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	154 return None
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	155 except UnicodeDecodeError as e:
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	156 log.warning(f"Invalid encoding, this is not a cache metadata file.")
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	157 return None
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	158
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	159 if cache_data.eol < time.time():
2624 56f94936df1e code style reformatting using black Goffi <goffi@goffi.org> parents: 2562 diff changeset	160 log.debug(
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	161 "removing expired cache (expired for {}s)".format(
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	162 time.time() - cache_data.eol
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	163 )
2624 56f94936df1e code style reformatting using black Goffi <goffi@goffi.org> parents: 2562 diff changeset	164 )
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	165 return None
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	166
3188 a15773c6c273 memory(cache): extend EOL when a file metadata is retrieved Goffi <goffi@goffi.org> parents: 3185 diff changeset	167 if update_eol:
3198 08151c103636 core (memory/cache): added some metadata: Goffi <goffi@goffi.org> parents: 3188 diff changeset	168 now = int(time.time())
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	169 cache_data.last_access = now
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	170 cache_data.eol = now + cache_data.max_age
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	171 with cache_url.open("w") as f:
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	172 f.write(cache_data.model_dump_json(exclude_none=True))
3188 a15773c6c273 memory(cache): extend EOL when a file metadata is retrieved Goffi <goffi@goffi.org> parents: 3185 diff changeset	173
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	174 # FIXME: we convert to dict to be compatible with former method (pre Pydantic).
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	175 # All call to get_metadata should use directly the Pydantic model in the future.
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	176 cache_data_dict = cache_data.model_dump()
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	177 cache_data_dict["path"] = self.get_path(cache_data.filename)
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	178 return cache_data_dict
2517 cd7a53c31eb6 core (memory/cache): new getMetadata method to retrieve metadata without opening the file Goffi <goffi@goffi.org> parents: 2509 diff changeset	179
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	180 def get_file_path(self, uid: str) -> Path \| None:
3185 554b3b632378 memory (cache): purge + pathlib: Goffi <goffi@goffi.org> parents: 3137 diff changeset	181 """Retrieve absolute path to file
2517 cd7a53c31eb6 core (memory/cache): new getMetadata method to retrieve metadata without opening the file Goffi <goffi@goffi.org> parents: 2509 diff changeset	182
cd7a53c31eb6 core (memory/cache): new getMetadata method to retrieve metadata without opening the file Goffi <goffi@goffi.org> parents: 2509 diff changeset	183 @param uid(unicode): unique identifier of file
cd7a53c31eb6 core (memory/cache): new getMetadata method to retrieve metadata without opening the file Goffi <goffi@goffi.org> parents: 2509 diff changeset	184 @return (unicode, None): absolute path to cached file
cd7a53c31eb6 core (memory/cache): new getMetadata method to retrieve metadata without opening the file Goffi <goffi@goffi.org> parents: 2509 diff changeset	185 None if file is not in cache (or cache is invalid)
cd7a53c31eb6 core (memory/cache): new getMetadata method to retrieve metadata without opening the file Goffi <goffi@goffi.org> parents: 2509 diff changeset	186 """
4037 524856bd7b19 massive refactoring to switch from camelCase to snake_case: Goffi <goffi@goffi.org> parents: 3818 diff changeset	187 metadata = self.get_metadata(uid)
2517 cd7a53c31eb6 core (memory/cache): new getMetadata method to retrieve metadata without opening the file Goffi <goffi@goffi.org> parents: 2509 diff changeset	188 if metadata is not None:
2624 56f94936df1e code style reformatting using black Goffi <goffi@goffi.org> parents: 2562 diff changeset	189 return metadata["path"]
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	190
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	191 def remove_from_cache(self, uid: str, metadata=None) -> None:
3210 fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	192 """Remove data from cache
fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	193
fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	194 @param uid(unicode): unique identifier cache file
fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	195 """
4037 524856bd7b19 massive refactoring to switch from camelCase to snake_case: Goffi <goffi@goffi.org> parents: 3818 diff changeset	196 cache_data = self.get_metadata(uid, update_eol=False)
3210 fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	197 if cache_data is None:
fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	198 log.debug(f"cache with uid {uid!r} has already expired or been removed")
fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	199 return
fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	200
fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	201 try:
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	202 filename = cache_data["filename"]
3210 fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	203 except KeyError:
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	204 log.warning(_("missing filename for cache {uid!r}").format(uid=uid))
3210 fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	205 else:
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	206 filepath = self.get_path(filename)
3210 fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	207 try:
fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	208 filepath.unlink()
fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	209 except FileNotFoundError:
fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	210 log.warning(
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	211 _("missing file referenced in cache {uid!r}: {filename}").format(
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	212 uid=uid, filename=filename
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	213 )
3210 fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	214 )
fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	215
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	216 cache_file = self.get_path(f"{uid}{CACHE_METADATA_EXT}")
3210 fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	217 cache_file.unlink()
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	218 log.debug(f"Cache with uid {uid!r} has been removed.")
3210 fedec192a83f core (memory/cache): new removeFromCache method Goffi <goffi@goffi.org> parents: 3209 diff changeset	219
4037 524856bd7b19 massive refactoring to switch from camelCase to snake_case: Goffi <goffi@goffi.org> parents: 3818 diff changeset	220 def cache_data(
3818 2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	221 self,
2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	222 source: str,
2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	223 uid: str,
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	224 mime_type: str \| None = None,
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	225 max_age: int = C.DEFAULT_MAX_AGE,
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	226 original_filename: str \| None = None,
3818 2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	227 ) -> BufferedIOBase:
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	228 """Create cache metadata and file object to use for actual data.
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	229
3818 2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	230 @param source: source of the cache (should be plugin's import_name)
2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	231 @param uid: an identifier of the file which must be unique
2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	232 @param mime_type: MIME type of the file to cache
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	233 it will be used notably to guess file extension
3198 08151c103636 core (memory/cache): added some metadata: Goffi <goffi@goffi.org> parents: 3188 diff changeset	234 It may be autogenerated if filename is specified
3818 2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	235 @param max_age: maximum age in seconds
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	236 the cache metadata will have an "eol" (end of life)
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	237 None to use default value
85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	238 0 to ignore cache (file will be re-downloaded on each access)
3818 2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	239 @param original_filename: if not None, will be used to retrieve file extension and
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	240 guess mime type, and stored in "original_filename"
3818 2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	241 @return: file object opened in write mode
2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	242 you have to close it yourself (hint: use ``with`` statement)
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	243 """
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	244 if original_filename is not None and mime_type is None:
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	245 # we have original_filename but not MIME type, we try to guess the later
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	246 mime_type = mimetypes.guess_type(original_filename, strict=False)[0]
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	247
3818 2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	248 if mime_type:
2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	249 ext = mimetypes.guess_extension(mime_type, strict=False)
2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	250 if ext is None:
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	251 log.warning("can't find extension for MIME type {}".format(mime_type))
3818 2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	252 ext = DEFAULT_EXT
2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	253 elif ext == ".jpe":
2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	254 ext = ".jpg"
2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	255 else:
2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	256 ext = DEFAULT_EXT
2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	257 mime_type = None
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	258
3818 2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	259 filename = uid + ext
2863345c9bbb core (memory/cache): type hints + filename fix: Goffi <goffi@goffi.org> parents: 3572 diff changeset	260 now = int(time.time())
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	261 metadata = CacheMetadata(
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	262 source=source,
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	263 uid=uid,
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	264 mime_type=mime_type,
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	265 max_age=max_age,
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	266 original_filename=original_filename,
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	267 filename=filename,
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	268 creation=now,
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	269 eol=now + max_age,
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	270 )
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	271
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	272 cache_metadata_file = self.get_path(f"{uid}{CACHE_METADATA_EXT}")
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	273 file_path = self.get_path(filename)
2109 85f3e12e984d core (memory/cache): file caching handling, first draft: Goffi <goffi@goffi.org> parents: diff changeset	274
4212 5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	275 with open(cache_metadata_file, "w") as f:
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	276 f.write(metadata.model_dump_json(exclude_none=True))
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	277
5f2d496c633f core: get rid of `pickle`: Goffi <goffi@goffi.org> parents: 4071 diff changeset	278 return open(file_path, "wb")

Mercurial > libervia-backend

annotate libervia/backend/memory/cache.py @ 4259:49019947cc76