Mercurial > libervia-backend
annotate sat/memory/cache.py @ 3198:08151c103636
core (memory/cache): added some metadata:
- creation/last_access are now set
- use filename to guess MIME type when suitable
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Sun, 01 Mar 2020 18:31:45 +0100 |
| parents | a15773c6c273 |
| children | f14eb24328d0 |
| 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 |
| 3136 | 5 # Copyright (C) 2009-2020 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 |
| 3185 | 20 import pickle as pickle |
| 21 import mimetypes | |
| 22 import time | |
| 23 from pathlib import Path | |
| 24 from sat.core.i18n import _ | |
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25 from sat.core.log import getLogger |
| 3185 | 26 from sat.core.constants import Const as C |
| 27 from sat.core import exceptions | |
| 28 from sat.tools.common import regex | |
| 29 | |
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30 |
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31 log = getLogger(__name__) |
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32 |
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33 DEFAULT_EXT = ".raw" |
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34 |
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35 |
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36 class Cache(object): |
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37 """generic file caching""" |
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38 |
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39 def __init__(self, host, profile): |
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40 """ |
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41 @param profile(unicode, None): ame of the profile to set the cache for |
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42 if None, the cache will be common for all profiles |
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43 """ |
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44 self.profile = profile |
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45 path_elts = [host.memory.getConfig("", "local_dir"), C.CACHE_DIR] |
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46 if profile: |
| 3028 | 47 path_elts.extend(["profiles", regex.pathEscape(profile)]) |
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48 else: |
| 3028 | 49 path_elts.append("common") |
| 3185 | 50 self.cache_dir = Path(*path_elts) |
| 51 | |
| 52 self.cache_dir.mkdir(0o700, parents=True, exist_ok=True) | |
| 53 self.purge() | |
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54 |
| 3185 | 55 def purge(self): |
| 56 # remove expired files from cache | |
| 57 # TODO: this should not be called only on startup, but at regular interval | |
| 58 # (e.g. once a day) | |
| 59 purged = set() | |
| 60 # we sort files to have metadata files first | |
| 61 for cache_file in sorted(self.cache_dir.iterdir()): | |
| 62 if cache_file in purged: | |
| 63 continue | |
| 64 try: | |
| 65 with cache_file.open('rb') as f: | |
| 66 cache_data = pickle.load(f) | |
| 67 except IOError: | |
| 68 log.warning( | |
| 69 _("Can't read metadata file at {path}") | |
| 70 .format(path=cache_file)) | |
| 71 continue | |
| 72 except (pickle.UnpicklingError, EOFError): | |
| 73 log.debug(f"File at {cache_file} is not a metadata file") | |
| 74 continue | |
| 75 try: | |
| 76 eol = cache_data['eol'] | |
| 77 filename = cache_data['filename'] | |
| 78 except KeyError: | |
| 79 log.warning( | |
| 80 _("Invalid cache metadata at {path}") | |
| 81 .format(path=cache_file)) | |
| 82 continue | |
| 83 | |
| 84 if eol < time.time(): | |
| 85 filepath = self.getPath(filename) | |
| 86 log.debug( | |
| 87 "purging expired cache {filepath!r} (expired for {time}s)" | |
| 88 .format(filepath=str(filepath), time=int(time.time() - eol)) | |
| 89 ) | |
| 90 cache_file.unlink() | |
| 91 try: | |
| 92 filepath.unlink() | |
| 93 except FileNotFoundError: | |
| 94 log.warning( | |
| 95 _("following file is missing while purging cache: {path}") | |
| 96 .format(path=filepath) | |
| 97 ) | |
| 98 purged.add(cache_file) | |
| 99 purged.add(filepath) | |
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100 |
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101 def getPath(self, filename): |
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102 """return cached file URL |
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103 |
| 3185 | 104 @param filename(str): cached file name (cache data or actual file) |
| 105 @return (Path): path to the cached file | |
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106 """ |
| 3028 | 107 if not filename or "/" in filename: |
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108 log.error( |
| 3028 | 109 "invalid char found in file name, hack attempt? name:{}".format(filename) |
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110 ) |
| 3028 | 111 raise exceptions.DataError("Invalid char found") |
| 3185 | 112 return self.cache_dir / filename |
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113 |
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114 def getMetadata(self, uid, update_eol=True): |
| 3185 | 115 """Retrieve metadata for cached data |
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116 |
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117 @param uid(unicode): unique identifier of file |
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118 @param update_eol(bool): True if eol must extended |
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119 if True, max_age will be added to eol (only if it is not already expired) |
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120 @return (dict, None): metadata with following keys: |
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121 see [cacheData] for data details, an additional "path" key is the full path to |
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122 cached file. |
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123 None if file is not in cache (or cache is invalid) |
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124 """ |
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125 |
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126 uid = uid.strip() |
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127 if not uid: |
| 3028 | 128 raise exceptions.InternalError("uid must not be empty") |
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129 cache_url = self.getPath(uid) |
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130 if not cache_url.exists(): |
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131 return None |
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132 |
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133 try: |
| 3185 | 134 with cache_url.open("rb") as f: |
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135 cache_data = pickle.load(f) |
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136 except IOError as e: |
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137 log.warning(f"can't read cache at {cache_url}: {e}") |
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138 return None |
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139 except pickle.UnpicklingError: |
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140 log.warning(f"invalid cache found at {cache_url}") |
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141 return None |
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142 |
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143 try: |
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144 eol = cache_data["eol"] |
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145 except KeyError: |
| 3028 | 146 log.warning("no End Of Life found for cached file {}".format(uid)) |
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147 eol = 0 |
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148 if eol < time.time(): |
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149 log.debug( |
| 3028 | 150 "removing expired cache (expired for {}s)".format(time.time() - eol) |
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151 ) |
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152 return None |
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153 |
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154 if update_eol: |
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155 try: |
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156 max_age = cache_data["max_age"] |
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157 except KeyError: |
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158 log.warning(f"no max_age found for cache at {cache_url}, using default") |
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159 max_age = cache_data["max_age"] = C.DEFAULT_MAX_AGE |
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160 now = int(time.time()) |
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161 cache_data["last_access"] = now |
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162 cache_data["eol"] = now + max_age |
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163 with cache_url.open("wb") as f: |
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164 pickle.dump(cache_data, f, protocol=2) |
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165 |
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166 cache_data["path"] = self.getPath(cache_data["filename"]) |
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167 return cache_data |
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168 |
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169 def getFilePath(self, uid): |
| 3185 | 170 """Retrieve absolute path to file |
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171 |
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172 @param uid(unicode): unique identifier of file |
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173 @return (unicode, None): absolute path to cached file |
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174 None if file is not in cache (or cache is invalid) |
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175 """ |
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176 metadata = self.getMetadata(uid) |
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177 if metadata is not None: |
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178 return metadata["path"] |
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179 |
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180 def cacheData(self, source, uid, mime_type=None, max_age=None, filename=None): |
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181 """create cache metadata and file object to use for actual data |
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182 |
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183 @param source(unicode): source of the cache (should be plugin's import_name) |
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184 @param uid(unicode): an identifier of the file which must be unique |
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185 @param mime_type(unicode): MIME type of the file to cache |
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186 it will be used notably to guess file extension |
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187 It may be autogenerated if filename is specified |
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188 @param max_age(int, None): maximum age in seconds |
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189 the cache metadata will have an "eol" (end of life) |
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190 None to use default value |
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191 0 to ignore cache (file will be re-downloaded on each access) |
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192 @param filename: if not None, will be used as filename |
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193 else one will be generated from uid and guessed extension |
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194 @return(file): file object opened in write mode |
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195 you have to close it yourself (hint: use with statement) |
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196 """ |
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197 cache_url = self.getPath(uid) |
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198 if filename is None: |
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199 if mime_type: |
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200 ext = mimetypes.guess_extension(mime_type, strict=False) |
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201 if ext is None: |
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202 log.warning( |
| 3028 | 203 "can't find extension for MIME type {}".format(mime_type) |
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204 ) |
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205 ext = DEFAULT_EXT |
| 3028 | 206 elif ext == ".jpe": |
| 207 ext = ".jpg" | |
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208 else: |
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209 ext = DEFAULT_EXT |
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210 mime_type = None |
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211 filename = uid + ext |
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212 elif mime_type is None: |
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213 # we have filename but not MIME type, we try to guess the later |
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214 mime_type = mimetypes.guess_type(filename, strict=False)[0] |
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215 if max_age is None: |
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216 max_age = C.DEFAULT_MAX_AGE |
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217 now = int(time.time()) |
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218 cache_data = { |
| 3028 | 219 "source": source, |
| 220 "filename": filename, | |
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221 "creation": now, |
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222 "eol": now + max_age, |
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223 # we also store max_age for updating eol |
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224 "max_age": max_age, |
| 3028 | 225 "mime_type": mime_type, |
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226 } |
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227 file_path = self.getPath(filename) |
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228 |
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229 with open(cache_url, "wb") as f: |
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230 pickle.dump(cache_data, f, protocol=2) |
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231 |
| 3185 | 232 return file_path.open("wb") |