Mercurial > libervia-backend
annotate libervia/backend/memory/cache.py @ 4242:8acf46ed7f36
frontends: remote control implementation:
This is the frontends common part of remote control implementation. It handle the creation
of WebRTC session, and management of inputs. For now the reception use freedesktop.org
Desktop portal, and works mostly with Wayland based Desktop Environments.
rel 436
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Sat, 11 May 2024 13:52:43 +0200 |
| parents | e11b13418ba6 |
| children |
| rev | line source |
|---|---|
| 3028 | 1 #!/usr/bin/env python3 |
| 3137 | 2 |
| 4212 | 3 # Libervia: an XMPP client |
| 4 # Copyright (C) 2009-2024 Jérôme Poisson (goffi@goffi.org) | |
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5 |
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6 # This program is free software: you can redistribute it and/or modify |
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7 # it under the terms of the GNU Affero General Public License as published by |
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8 # the Free Software Foundation, either version 3 of the License, or |
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9 # (at your option) any later version. |
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10 |
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11 # This program is distributed in the hope that it will be useful, |
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12 # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 # GNU Affero General Public License for more details. |
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15 |
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16 # You should have received a copy of the GNU Affero General Public License |
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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18 |
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19 from io import BufferedIOBase |
| 3185 | 20 import mimetypes |
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21 from pathlib import Path |
| 3185 | 22 import time |
| 4212 | 23 from typing import Any |
| 24 | |
| 25 from pydantic import BaseModel, ValidationError | |
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26 |
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27 from libervia.backend.core import exceptions |
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28 from libervia.backend.core.constants import Const as C |
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29 from libervia.backend.core.i18n import _ |
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30 from libervia.backend.core.log import getLogger |
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31 from libervia.backend.tools.common import regex |
| 3185 | 32 |
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33 |
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34 log = getLogger(__name__) |
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35 |
| 4212 | 36 CACHE_METADATA_EXT = ".cache.json" |
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37 DEFAULT_EXT = ".raw" |
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38 |
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39 |
| 4212 | 40 class CacheMetadata(BaseModel): |
| 41 source: str | |
| 42 uid: str | |
| 43 filename: str | |
| 44 creation: int | |
| 45 eol: int | |
| 46 max_age: int = C.DEFAULT_MAX_AGE | |
| 47 original_filename: str | None = None | |
| 48 mime_type: str | None = None | |
| 49 last_access: int | None = None | |
| 50 | |
| 51 | |
| 52 class Cache: | |
| 53 """Generic file caching.""" | |
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54 |
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55 def __init__(self, host, profile): |
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56 """ |
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57 @param profile(unicode, None): name of the profile to set the cache for |
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58 if None, the cache will be common for all profiles |
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59 """ |
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60 self.profile = profile |
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61 path_elts = [host.memory.config_get("", "local_dir"), C.CACHE_DIR] |
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62 if profile: |
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63 path_elts.extend(["profiles", regex.path_escape(profile)]) |
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64 else: |
| 3028 | 65 path_elts.append("common") |
| 3185 | 66 self.cache_dir = Path(*path_elts) |
| 67 | |
| 68 self.cache_dir.mkdir(0o700, parents=True, exist_ok=True) | |
| 69 self.purge() | |
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70 |
| 3185 | 71 def purge(self): |
| 4212 | 72 # Remove expired, unreadable, and unrelated files from cache |
| 3185 | 73 # TODO: this should not be called only on startup, but at regular interval |
| 74 # (e.g. once a day) | |
| 4212 | 75 to_delete = set() |
| 76 seen = set() | |
| 77 now = time.time() | |
| 78 for cache_data_file in self.cache_dir.glob(f"*{CACHE_METADATA_EXT}"): | |
| 3185 | 79 try: |
| 4212 | 80 with cache_data_file.open("r") as f: |
| 81 cache_data = CacheMetadata.model_validate_json(f.read()) | |
| 82 except (IOError, ValidationError): | |
| 3185 | 83 log.warning( |
| 4212 | 84 _("Can't read metadata file at {path}, deleting it.").format( |
| 85 path=cache_data_file | |
| 86 ) | |
| 87 ) | |
| 88 to_delete.add(cache_data_file) | |
| 3185 | 89 continue |
| 4212 | 90 else: |
| 91 cached_file = self.get_path(cache_data.filename) | |
| 92 if not cached_file.exists(): | |
| 93 log.warning( | |
| 94 f"Cache file {cache_data_file!r} references a non-existent file " | |
| 95 f"and will be deleted: {cache_data_file!r}." | |
| 96 ) | |
| 97 to_delete.add(cache_data_file) | |
| 98 elif cache_data.eol < now: | |
| 99 log.debug( | |
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100 f"Purging expired cache file {cache_data_file} (expired for " |
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101 f"{int(time.time() - cache_data.eol)}s)" |
| 4212 | 102 ) |
| 103 to_delete.add(cache_data_file) | |
| 104 seen.add(cached_file) | |
| 105 seen.add(cache_data_file) | |
| 3185 | 106 |
| 4212 | 107 for file in to_delete: |
| 108 log.debug(f"Deleting cache file: {file}") | |
| 109 file.unlink() | |
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110 |
| 4212 | 111 for file in self.cache_dir.iterdir(): |
| 112 if file not in seen: | |
| 113 log.debug(f"Deleting irrelevant file in cache dir: {file}") | |
| 114 file.unlink() | |
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115 |
| 4212 | 116 def get_path(self, filename: str) -> Path: |
| 117 """Return cached file URL. | |
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118 |
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119 @param filename: cached file name (cache data or actual file) |
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120 @return: path to the cached file |
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121 """ |
| 3028 | 122 if not filename or "/" in filename: |
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123 log.error( |
| 3028 | 124 "invalid char found in file name, hack attempt? name:{}".format(filename) |
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125 ) |
| 3028 | 126 raise exceptions.DataError("Invalid char found") |
| 3185 | 127 return self.cache_dir / filename |
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128 |
| 4212 | 129 def get_metadata(self, uid: str, update_eol: bool = True) -> dict[str, Any] | None: |
| 130 """Retrieve metadata for cached data. | |
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131 |
| 4212 | 132 @param uid: unique identifier of cache metadata. |
| 133 @param update_eol: True if eol must extended | |
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134 if True, max_age will be added to eol (only if it is not already expired) |
| 4212 | 135 @return: metadata, see [cache_data] for data details, an additional "path" key is |
| 136 the full path to cached file. | |
| 137 None if file is not in cache (or cache is invalid). | |
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138 """ |
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139 uid = uid.strip() |
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140 if not uid: |
| 3028 | 141 raise exceptions.InternalError("uid must not be empty") |
| 4212 | 142 cache_url = self.get_path(f"{uid}{CACHE_METADATA_EXT}") |
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143 if not cache_url.exists(): |
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144 return None |
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145 |
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146 try: |
| 4212 | 147 with cache_url.open("r") as f: |
| 148 cache_data = CacheMetadata.model_validate_json(f.read()) | |
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149 except (IOError, EOFError) as e: |
| 4212 | 150 log.warning(f"Can't read cache at {cache_url}: {e}") |
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151 return None |
| 4212 | 152 except ValidationError: |
| 153 log.warning(f"Invalid cache found at {cache_url}") | |
| 154 return None | |
| 155 except UnicodeDecodeError as e: | |
| 156 log.warning(f"Invalid encoding, this is not a cache metadata file.") | |
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157 return None |
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158 |
| 4212 | 159 if cache_data.eol < time.time(): |
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160 log.debug( |
| 4212 | 161 "removing expired cache (expired for {}s)".format( |
| 162 time.time() - cache_data.eol | |
| 163 ) | |
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164 ) |
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165 return None |
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166 |
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167 if update_eol: |
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168 now = int(time.time()) |
| 4212 | 169 cache_data.last_access = now |
| 170 cache_data.eol = now + cache_data.max_age | |
| 171 with cache_url.open("w") as f: | |
| 172 f.write(cache_data.model_dump_json(exclude_none=True)) | |
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173 |
| 4212 | 174 # FIXME: we convert to dict to be compatible with former method (pre Pydantic). |
| 175 # All call to get_metadata should use directly the Pydantic model in the future. | |
| 176 cache_data_dict = cache_data.model_dump() | |
| 177 cache_data_dict["path"] = self.get_path(cache_data.filename) | |
| 178 return cache_data_dict | |
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179 |
| 4212 | 180 def get_file_path(self, uid: str) -> Path | None: |
| 3185 | 181 """Retrieve absolute path to file |
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182 |
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183 @param uid(unicode): unique identifier of file |
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184 @return (unicode, None): absolute path to cached file |
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185 None if file is not in cache (or cache is invalid) |
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186 """ |
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187 metadata = self.get_metadata(uid) |
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188 if metadata is not None: |
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189 return metadata["path"] |
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190 |
| 4212 | 191 def remove_from_cache(self, uid: str, metadata=None) -> None: |
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192 """Remove data from cache |
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193 |
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194 @param uid(unicode): unique identifier cache file |
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195 """ |
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196 cache_data = self.get_metadata(uid, update_eol=False) |
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197 if cache_data is None: |
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198 log.debug(f"cache with uid {uid!r} has already expired or been removed") |
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199 return |
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200 |
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201 try: |
| 4212 | 202 filename = cache_data["filename"] |
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203 except KeyError: |
| 4212 | 204 log.warning(_("missing filename for cache {uid!r}").format(uid=uid)) |
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205 else: |
| 4212 | 206 filepath = self.get_path(filename) |
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207 try: |
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208 filepath.unlink() |
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209 except FileNotFoundError: |
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210 log.warning( |
| 4212 | 211 _("missing file referenced in cache {uid!r}: {filename}").format( |
| 212 uid=uid, filename=filename | |
| 213 ) | |
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214 ) |
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215 |
| 4212 | 216 cache_file = self.get_path(f"{uid}{CACHE_METADATA_EXT}") |
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217 cache_file.unlink() |
| 4212 | 218 log.debug(f"Cache with uid {uid!r} has been removed.") |
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219 |
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220 def cache_data( |
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221 self, |
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222 source: str, |
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223 uid: str, |
| 4212 | 224 mime_type: str | None = None, |
| 225 max_age: int = C.DEFAULT_MAX_AGE, | |
| 226 original_filename: str | None = None, | |
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227 ) -> BufferedIOBase: |
| 4212 | 228 """Create cache metadata and file object to use for actual data. |
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229 |
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230 @param source: source of the cache (should be plugin's import_name) |
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231 @param uid: an identifier of the file which must be unique |
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232 @param mime_type: MIME type of the file to cache |
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233 it will be used notably to guess file extension |
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234 It may be autogenerated if filename is specified |
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235 @param max_age: maximum age in seconds |
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236 the cache metadata will have an "eol" (end of life) |
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237 None to use default value |
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238 0 to ignore cache (file will be re-downloaded on each access) |
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239 @param original_filename: if not None, will be used to retrieve file extension and |
| 4212 | 240 guess mime type, and stored in "original_filename" |
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241 @return: file object opened in write mode |
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242 you have to close it yourself (hint: use ``with`` statement) |
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243 """ |
| 4212 | 244 if original_filename is not None and mime_type is None: |
| 245 # we have original_filename but not MIME type, we try to guess the later | |
| 246 mime_type = mimetypes.guess_type(original_filename, strict=False)[0] | |
| 247 | |
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248 if mime_type: |
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249 ext = mimetypes.guess_extension(mime_type, strict=False) |
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250 if ext is None: |
| 4212 | 251 log.warning("can't find extension for MIME type {}".format(mime_type)) |
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252 ext = DEFAULT_EXT |
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253 elif ext == ".jpe": |
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254 ext = ".jpg" |
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255 else: |
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256 ext = DEFAULT_EXT |
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257 mime_type = None |
| 4212 | 258 |
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259 filename = uid + ext |
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260 now = int(time.time()) |
| 4212 | 261 metadata = CacheMetadata( |
| 262 source=source, | |
| 263 uid=uid, | |
| 264 mime_type=mime_type, | |
| 265 max_age=max_age, | |
| 266 original_filename=original_filename, | |
| 267 filename=filename, | |
| 268 creation=now, | |
| 269 eol=now + max_age, | |
| 270 ) | |
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271 |
| 4212 | 272 cache_metadata_file = self.get_path(f"{uid}{CACHE_METADATA_EXT}") |
| 273 file_path = self.get_path(filename) | |
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274 |
| 4212 | 275 with open(cache_metadata_file, "w") as f: |
| 276 f.write(metadata.model_dump_json(exclude_none=True)) | |
| 277 | |
| 278 return open(file_path, "wb") |