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annotate sat/memory/cache.py @ 3855:54305ebf5b94
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| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Thu, 14 Jul 2022 12:55:30 +0200 |
| parents | 2863345c9bbb |
| children | 524856bd7b19 |
| rev | line source |
|---|---|
| 3028 | 1 #!/usr/bin/env python3 |
| 3137 | 2 |
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3 |
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4 # SAT: a jabber client |
| 3479 | 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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11 |
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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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16 |
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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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19 |
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20 from io import BufferedIOBase |
| 3185 | 21 import mimetypes |
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22 from pathlib import Path |
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23 import pickle as pickle |
| 3185 | 24 import time |
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25 from typing import Any, Dict, Optional |
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26 |
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27 from sat.core import exceptions |
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28 from sat.core.constants import Const as C |
| 3185 | 29 from sat.core.i18n import _ |
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30 from sat.core.log import getLogger |
| 3185 | 31 from sat.tools.common import regex |
| 32 | |
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33 |
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34 log = getLogger(__name__) |
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35 |
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36 DEFAULT_EXT = ".raw" |
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37 |
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38 |
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39 class Cache(object): |
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40 """generic file caching""" |
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41 |
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42 def __init__(self, host, profile): |
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43 """ |
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44 @param profile(unicode, None): name of the profile to set the cache for |
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45 if None, the cache will be common for all profiles |
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46 """ |
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47 self.profile = profile |
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48 path_elts = [host.memory.getConfig("", "local_dir"), C.CACHE_DIR] |
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49 if profile: |
| 3028 | 50 path_elts.extend(["profiles", regex.pathEscape(profile)]) |
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51 else: |
| 3028 | 52 path_elts.append("common") |
| 3185 | 53 self.cache_dir = Path(*path_elts) |
| 54 | |
| 55 self.cache_dir.mkdir(0o700, parents=True, exist_ok=True) | |
| 56 self.purge() | |
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57 |
| 3185 | 58 def purge(self): |
| 59 # remove expired files from cache | |
| 60 # TODO: this should not be called only on startup, but at regular interval | |
| 61 # (e.g. once a day) | |
| 62 purged = set() | |
| 63 # we sort files to have metadata files first | |
| 64 for cache_file in sorted(self.cache_dir.iterdir()): | |
| 65 if cache_file in purged: | |
| 66 continue | |
| 67 try: | |
| 68 with cache_file.open('rb') as f: | |
| 69 cache_data = pickle.load(f) | |
| 70 except IOError: | |
| 71 log.warning( | |
| 72 _("Can't read metadata file at {path}") | |
| 73 .format(path=cache_file)) | |
| 74 continue | |
| 75 except (pickle.UnpicklingError, EOFError): | |
| 76 log.debug(f"File at {cache_file} is not a metadata file") | |
| 77 continue | |
| 78 try: | |
| 79 eol = cache_data['eol'] | |
| 80 filename = cache_data['filename'] | |
| 81 except KeyError: | |
| 82 log.warning( | |
| 83 _("Invalid cache metadata at {path}") | |
| 84 .format(path=cache_file)) | |
| 85 continue | |
| 86 | |
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87 filepath = self.getPath(filename) |
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88 |
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89 if not filepath.exists(): |
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90 log.warning(_( |
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91 "cache {cache_file!r} references an inexisting file: {filepath!r}" |
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92 ).format(cache_file=str(cache_file), filepath=str(filepath))) |
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93 log.debug("purging cache with missing file") |
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94 cache_file.unlink() |
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95 elif eol < time.time(): |
| 3185 | 96 log.debug( |
| 97 "purging expired cache {filepath!r} (expired for {time}s)" | |
| 98 .format(filepath=str(filepath), time=int(time.time() - eol)) | |
| 99 ) | |
| 100 cache_file.unlink() | |
| 101 try: | |
| 102 filepath.unlink() | |
| 103 except FileNotFoundError: | |
| 104 log.warning( | |
| 105 _("following file is missing while purging cache: {path}") | |
| 106 .format(path=filepath) | |
| 107 ) | |
| 108 purged.add(cache_file) | |
| 109 purged.add(filepath) | |
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110 |
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111 def getPath(self, filename: str) -> Path: |
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112 """return cached file URL |
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113 |
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114 @param filename: cached file name (cache data or actual file) |
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115 @return: path to the cached file |
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116 """ |
| 3028 | 117 if not filename or "/" in filename: |
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118 log.error( |
| 3028 | 119 "invalid char found in file name, hack attempt? name:{}".format(filename) |
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120 ) |
| 3028 | 121 raise exceptions.DataError("Invalid char found") |
| 3185 | 122 return self.cache_dir / filename |
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123 |
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124 def getMetadata(self, uid: str, update_eol: bool = True) -> Optional[Dict[str, Any]]: |
| 3185 | 125 """Retrieve metadata for cached data |
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126 |
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127 @param uid(unicode): unique identifier of file |
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128 @param update_eol(bool): True if eol must extended |
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129 if True, max_age will be added to eol (only if it is not already expired) |
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130 @return (dict, None): metadata with following keys: |
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131 see [cacheData] for data details, an additional "path" key is the full path to |
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132 cached file. |
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133 None if file is not in cache (or cache is invalid) |
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134 """ |
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135 |
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136 uid = uid.strip() |
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137 if not uid: |
| 3028 | 138 raise exceptions.InternalError("uid must not be empty") |
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139 cache_url = self.getPath(uid) |
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140 if not cache_url.exists(): |
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141 return None |
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142 |
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143 try: |
| 3185 | 144 with cache_url.open("rb") as f: |
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145 cache_data = pickle.load(f) |
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146 except (IOError, EOFError) as e: |
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147 log.warning(f"can't read cache at {cache_url}: {e}") |
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148 return None |
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149 except pickle.UnpicklingError: |
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150 log.warning(f"invalid cache found at {cache_url}") |
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151 return None |
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152 |
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153 try: |
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154 eol = cache_data["eol"] |
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155 except KeyError: |
| 3028 | 156 log.warning("no End Of Life found for cached file {}".format(uid)) |
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157 eol = 0 |
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158 if eol < time.time(): |
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159 log.debug( |
| 3028 | 160 "removing expired cache (expired for {}s)".format(time.time() - eol) |
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161 ) |
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162 return None |
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163 |
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164 if update_eol: |
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165 try: |
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166 max_age = cache_data["max_age"] |
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167 except KeyError: |
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168 log.warning(f"no max_age found for cache at {cache_url}, using default") |
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169 max_age = cache_data["max_age"] = C.DEFAULT_MAX_AGE |
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170 now = int(time.time()) |
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171 cache_data["last_access"] = now |
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172 cache_data["eol"] = now + max_age |
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173 with cache_url.open("wb") as f: |
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174 pickle.dump(cache_data, f, protocol=2) |
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175 |
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176 cache_data["path"] = self.getPath(cache_data["filename"]) |
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177 return cache_data |
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178 |
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179 def getFilePath(self, uid: str) -> Path: |
| 3185 | 180 """Retrieve absolute path to file |
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181 |
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182 @param uid(unicode): unique identifier of file |
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183 @return (unicode, None): absolute path to cached file |
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184 None if file is not in cache (or cache is invalid) |
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185 """ |
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186 metadata = self.getMetadata(uid) |
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187 if metadata is not None: |
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188 return metadata["path"] |
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189 |
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190 def removeFromCache(self, uid, metadata=None): |
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191 """Remove data from cache |
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192 |
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193 @param uid(unicode): unique identifier cache file |
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194 """ |
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195 cache_data = self.getMetadata(uid, update_eol=False) |
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196 if cache_data is None: |
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197 log.debug(f"cache with uid {uid!r} has already expired or been removed") |
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198 return |
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199 |
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200 try: |
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201 filename = cache_data['filename'] |
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202 except KeyError: |
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203 log.warning(_("missing filename for cache {uid!r}") .format(uid=uid)) |
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204 else: |
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205 filepath = self.getPath(filename) |
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206 try: |
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207 filepath.unlink() |
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208 except FileNotFoundError: |
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209 log.warning( |
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210 _("missing file referenced in cache {uid!r}: {filename}") |
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211 .format(uid=uid, filename=filename) |
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212 ) |
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213 |
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214 cache_file = self.getPath(uid) |
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215 cache_file.unlink() |
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216 log.debug(f"cache with uid {uid!r} has been removed") |
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217 |
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218 def cacheData( |
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219 self, |
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220 source: str, |
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221 uid: str, |
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222 mime_type: Optional[str] = None, |
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223 max_age: Optional[int] = None, |
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224 original_filename: Optional[str] = None |
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225 ) -> BufferedIOBase: |
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226 """create cache metadata and file object to use for actual data |
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227 |
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228 @param source: source of the cache (should be plugin's import_name) |
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229 @param uid: an identifier of the file which must be unique |
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230 @param mime_type: MIME type of the file to cache |
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231 it will be used notably to guess file extension |
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232 It may be autogenerated if filename is specified |
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233 @param max_age: maximum age in seconds |
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234 the cache metadata will have an "eol" (end of life) |
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235 None to use default value |
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236 0 to ignore cache (file will be re-downloaded on each access) |
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237 @param original_filename: if not None, will be used to retrieve file extension and |
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238 guess |
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239 mime type, and stored in "original_filename" |
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240 @return: file object opened in write mode |
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241 you have to close it yourself (hint: use ``with`` statement) |
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242 """ |
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243 if max_age is None: |
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244 max_age = C.DEFAULT_MAX_AGE |
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245 cache_data = { |
| 3028 | 246 "source": source, |
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247 # we also store max_age for updating eol |
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248 "max_age": max_age, |
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249 } |
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250 cache_url = self.getPath(uid) |
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251 if original_filename is not None: |
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252 cache_data["original_filename"] = original_filename |
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253 if mime_type is None: |
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254 # we have original_filename but not MIME type, we try to guess the later |
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255 mime_type = mimetypes.guess_type(original_filename, strict=False)[0] |
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256 if mime_type: |
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257 ext = mimetypes.guess_extension(mime_type, strict=False) |
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258 if ext is None: |
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259 log.warning( |
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260 "can't find extension for MIME type {}".format(mime_type) |
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261 ) |
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262 ext = DEFAULT_EXT |
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263 elif ext == ".jpe": |
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264 ext = ".jpg" |
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265 else: |
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266 ext = DEFAULT_EXT |
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267 mime_type = None |
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268 filename = uid + ext |
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269 now = int(time.time()) |
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270 cache_data.update({ |
| 3028 | 271 "filename": filename, |
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272 "creation": now, |
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273 "eol": now + max_age, |
| 3028 | 274 "mime_type": mime_type, |
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275 }) |
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276 file_path = self.getPath(filename) |
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277 |
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278 with open(cache_url, "wb") as f: |
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core (memory/cache): file caching handling, first draft:
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parents:
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279 pickle.dump(cache_data, f, protocol=2) |
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core (memory/cache): file caching handling, first draft:
Goffi <goffi@goffi.org>
parents:
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280 |
| 3185 | 281 return file_path.open("wb") |