annotate sat/memory/cache.py @ 3188:a15773c6c273

memory(cache): extend EOL when a file metadata is retrieved
author Goffi <goffi@goffi.org>
date Wed, 26 Feb 2020 22:03:15 +0100
parents 554b3b632378
children 08151c103636
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #!/usr/bin/env python3
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2
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3
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4 # SAT: a jabber client
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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
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20 import pickle as pickle
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21 import mimetypes
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22 import time
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23 from pathlib import Path
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24 from sat.core.i18n import _
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25 from sat.core.log import getLogger
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26 from sat.core.constants import Const as C
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27 from sat.core import exceptions
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28 from sat.tools.common import regex
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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:
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47 path_elts.extend(["profiles", regex.pathEscape(profile)])
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48 else:
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49 path_elts.append("common")
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50 self.cache_dir = Path(*path_elts)
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51
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52 self.cache_dir.mkdir(0o700, parents=True, exist_ok=True)
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53 self.purge()
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54
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55 def purge(self):
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56 # remove expired files from cache
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57 # TODO: this should not be called only on startup, but at regular interval
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58 # (e.g. once a day)
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59 purged = set()
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60 # we sort files to have metadata files first
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61 for cache_file in sorted(self.cache_dir.iterdir()):
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62 if cache_file in purged:
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63 continue
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64 try:
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65 with cache_file.open('rb') as f:
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66 cache_data = pickle.load(f)
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67 except IOError:
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68 log.warning(
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69 _("Can't read metadata file at {path}")
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70 .format(path=cache_file))
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71 continue
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72 except (pickle.UnpicklingError, EOFError):
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73 log.debug(f"File at {cache_file} is not a metadata file")
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74 continue
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75 try:
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76 eol = cache_data['eol']
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77 filename = cache_data['filename']
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78 except KeyError:
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79 log.warning(
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80 _("Invalid cache metadata at {path}")
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81 .format(path=cache_file))
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82 continue
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83
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84 if eol < time.time():
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85 filepath = self.getPath(filename)
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86 log.debug(
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87 "purging expired cache {filepath!r} (expired for {time}s)"
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88 .format(filepath=str(filepath), time=int(time.time() - eol))
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89 )
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90 cache_file.unlink()
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91 try:
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92 filepath.unlink()
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93 except FileNotFoundError:
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94 log.warning(
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95 _("following file is missing while purging cache: {path}")
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96 .format(path=filepath)
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97 )
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98 purged.add(cache_file)
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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
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104 @param filename(str): cached file name (cache data or actual file)
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105 @return (Path): path to the cached file
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106 """
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107 if not filename or "/" in filename:
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108 log.error(
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109 "invalid char found in file name, hack attempt? name:{}".format(filename)
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110 )
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111 raise exceptions.DataError("Invalid char found")
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112 return self.cache_dir / filename
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113
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114 def getMetadata(self, uid, update_eol=True):
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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:
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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:
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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:
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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(
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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 cache_data["eol"] = int(time.time()) + max_age
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161 with cache_url.open("wb") as f:
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162 pickle.dump(cache_data, f, protocol=2)
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163
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164 cache_data["path"] = self.getPath(cache_data["filename"])
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165 return cache_data
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166
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167 def getFilePath(self, uid):
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168 """Retrieve absolute path to file
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169
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170 @param uid(unicode): unique identifier of file
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171 @return (unicode, None): absolute path to cached file
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172 None if file is not in cache (or cache is invalid)
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173 """
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174 metadata = self.getMetadata(uid)
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175 if metadata is not None:
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176 return metadata["path"]
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177
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178 def cacheData(self, source, uid, mime_type=None, max_age=None, filename=None):
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179 """create cache metadata and file object to use for actual data
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180
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181 @param source(unicode): source of the cache (should be plugin's import_name)
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182 @param uid(unicode): an identifier of the file which must be unique
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183 @param mime_type(unicode): MIME type of the file to cache
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184 it will be used notably to guess file extension
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185 @param max_age(int, None): maximum age in seconds
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186 the cache metadata will have an "eol" (end of life)
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187 None to use default value
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188 0 to ignore cache (file will be re-downloaded on each access)
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189 @param filename: if not None, will be used as filename
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190 else one will be generated from uid and guessed extension
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191 @return(file): file object opened in write mode
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192 you have to close it yourself (hint: use with statement)
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193 """
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194 cache_url = self.getPath(uid)
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195 if filename is None:
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196 if mime_type:
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197 ext = mimetypes.guess_extension(mime_type, strict=False)
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198 if ext is None:
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199 log.warning(
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200 "can't find extension for MIME type {}".format(mime_type)
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201 )
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202 ext = DEFAULT_EXT
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203 elif ext == ".jpe":
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204 ext = ".jpg"
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205 else:
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206 ext = DEFAULT_EXT
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207 mime_type = None
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208 filename = uid + ext
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209 if max_age is None:
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210 max_age = C.DEFAULT_MAX_AGE
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211 cache_data = {
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212 "source": source,
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213 "filename": filename,
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214 "eol": int(time.time()) + max_age,
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215 # we also store max_age for updating eol
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216 "max_age": max_age,
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217 "mime_type": mime_type,
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218 }
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219 file_path = self.getPath(filename)
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220
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221 with open(cache_url, "wb") as f:
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222 pickle.dump(cache_data, f, protocol=2)
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223
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224 return file_path.open("wb")