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annotate sat/memory/cache.py @ 2901:f6b0088ce247

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code (xmpp): store version after roster item update + fix item removal: roster version is now stored after roster item has been added or removed. This way if something interrupting the process happens, former item update will be received and roster should be updated correctly. Roster item removal was crashing because `load()` is not used (local PersistentDict cache is then not updated, and the key to remove is missing there). The exception is now catched and ignored to avoid loading the data only to remove an item.
author Goffi <goffi@goffi.org>
date Wed, 10 Apr 2019 21:04:41 +0200
parents 003b8b4b56a7
children ab2696e34d29
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/bin/env python2
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2019 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 sat.core.log import getLogger
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21
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22 log = getLogger(__name__)
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23 from sat.tools.common import regex
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24 from sat.core import exceptions
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25 from sat.core.constants import Const as C
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26 import cPickle as pickle
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27 import mimetypes
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28 import os.path
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29 import time
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30
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31 DEFAULT_EXT = ".raw"
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32
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33
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34 class Cache(object):
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35 """generic file caching"""
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36
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37 def __init__(self, host, profile):
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38 """
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39 @param profile(unicode, None): ame of the profile to set the cache for
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40 if None, the cache will be common for all profiles
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41 """
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42 self.profile = profile
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43 path_elts = [host.memory.getConfig("", "local_dir"), C.CACHE_DIR]
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44 if profile:
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45 path_elts.extend([u"profiles", regex.pathEscape(profile)])
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46 else:
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47 path_elts.append(u"common")
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48 self.cache_dir = os.path.join(*path_elts)
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49
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50 if not os.path.exists(self.cache_dir):
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51 os.makedirs(self.cache_dir)
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52
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53 def getPath(self, filename):
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54 """return cached file URL
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55
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56 @param filename(unicode): cached file name (cache data or actual file)
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57 """
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58 if not filename or u"/" in filename:
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59 log.error(
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60 u"invalid char found in file name, hack attempt? name:{}".format(filename)
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61 )
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62 raise exceptions.DataError(u"Invalid char found")
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63 return os.path.join(self.cache_dir, filename)
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64
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65 def getMetadata(self, uid):
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66 """retrieve metadata for cached data
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67
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68 @param uid(unicode): unique identifier of file
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69 @return (dict, None): metadata with following keys:
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70 see [cacheData] for data details, an additional "path" key is the full path to cached file.
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71 None if file is not in cache (or cache is invalid)
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72 """
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73
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74 uid = uid.strip()
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75 if not uid:
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76 raise exceptions.InternalError(u"uid must not be empty")
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77 cache_url = self.getPath(uid)
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78 if not os.path.exists(cache_url):
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79 return None
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80
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81 try:
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82 with open(cache_url, "rb") as f:
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83 cache_data = pickle.load(f)
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84 except IOError:
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85 log.warning(u"can't read cache at {}".format(cache_url))
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86 return None
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87 except pickle.UnpicklingError:
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88 log.warning(u"invalid cache found at {}".format(cache_url))
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89 return None
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90
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91 try:
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92 eol = cache_data["eol"]
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93 except KeyError:
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94 log.warning(u"no End Of Life found for cached file {}".format(uid))
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95 eol = 0
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96 if eol < time.time():
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97 log.debug(
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98 u"removing expired cache (expired for {}s)".format(time.time() - eol)
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99 )
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100 return None
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101
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102 cache_data["path"] = self.getPath(cache_data["filename"])
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103 return cache_data
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104
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105 def getFilePath(self, uid):
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106 """retrieve absolute path to file
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107
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108 @param uid(unicode): unique identifier of file
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109 @return (unicode, None): absolute path to cached file
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110 None if file is not in cache (or cache is invalid)
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111 """
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112 metadata = self.getMetadata(uid)
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113 if metadata is not None:
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114 return metadata["path"]
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115
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116 def cacheData(self, source, uid, mime_type=None, max_age=None, filename=None):
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117 """create cache metadata and file object to use for actual data
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118
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119 @param source(unicode): source of the cache (should be plugin's import_name)
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120 @param uid(unicode): an identifier of the file which must be unique
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121 @param mime_type(unicode): MIME type of the file to cache
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122 it will be used notably to guess file extension
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123 @param max_age(int, None): maximum age in seconds
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124 the cache metadata will have an "eol" (end of life)
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125 None to use default value
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126 0 to ignore cache (file will be re-downloaded on each access)
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127 @param filename: if not None, will be used as filename
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128 else one will be generated from uid and guessed extension
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129 @return(file): file object opened in write mode
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130 you have to close it yourself (hint: use with statement)
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131 """
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132 cache_url = self.getPath(uid)
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133 if filename is None:
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134 if mime_type:
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135 ext = mimetypes.guess_extension(mime_type, strict=False)
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136 if ext is None:
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137 log.warning(
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138 u"can't find extension for MIME type {}".format(mime_type)
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139 )
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140 ext = DEFAULT_EXT
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141 elif ext == u".jpe":
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142 ext = u".jpg"
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143 else:
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144 ext = DEFAULT_EXT
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145 mime_type = None
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146 filename = uid + ext
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147 if max_age is None:
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148 max_age = C.DEFAULT_MAX_AGE
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149 cache_data = {
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150 u"source": source,
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151 u"filename": filename,
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152 u"eol": int(time.time()) + max_age,
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153 u"mime_type": mime_type,
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154 }
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155 file_path = self.getPath(filename)
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156
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157 with open(cache_url, "wb") as f:
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158 pickle.dump(cache_data, f, protocol=2)
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159
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160 return open(file_path, "wb")