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annotate sat/memory/cache.py @ 2617:81b70eeb710f

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quick_frontend(contact list): refactored update: update is now called with appropriate constant value (C.UPDATE_ADD, C.UPDATE_DELETE, C.UPDATE_MODIFY and so on) when a widget change visibility according to current options. Before it was linked to cache only (C.UPDATE_ADD was only called when contact was first added to cache). This make widget handling in frontends more easy. Renamed entityToShow to entityVisible, which seems to correspond better. Started reducing lines lenght to 90 chars as a test. May become the new coding style soon.
author Goffi <goffi@goffi.org>
date Sun, 24 Jun 2018 21:59:29 +0200
parents 26edcf3a30eb
children 56f94936df1e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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) 2009-2018 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 log = getLogger(__name__)
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22 from sat.tools.common import regex
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23 from sat.core import exceptions
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24 from sat.core.constants import Const as C
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25 import cPickle as pickle
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26 import mimetypes
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27 import os.path
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28 import time
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29
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30 DEFAULT_EXT = '.raw'
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31
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32
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33 class Cache(object):
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34 """generic file caching"""
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35
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36 def __init__(self, host, profile):
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37 """
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38 @param profile(unicode, None): ame of the profile to set the cache for
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39 if None, the cache will be common for all profiles
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40 """
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41 self.profile = profile
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42 path_elts = [host.memory.getConfig('', 'local_dir'), C.CACHE_DIR]
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43 if profile:
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44 path_elts.extend([u'profiles',regex.pathEscape(profile)])
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45 else:
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46 path_elts.append(u'common')
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47 self.cache_dir = os.path.join(*path_elts)
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48
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49 if not os.path.exists(self.cache_dir):
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50 os.makedirs(self.cache_dir)
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51
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52 def getPath(self, filename):
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53 """return cached file URL
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54
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55 @param filename(unicode): cached file name (cache data or actual file)
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56 """
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57 if not filename or u'/' in filename:
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58 log.error(u"invalid char found in file name, hack attempt? name:{}".format(filename))
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59 raise exceptions.DataError(u"Invalid char found")
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60 return os.path.join(self.cache_dir, filename)
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61
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62 def getMetadata(self, uid):
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63 """retrieve metadata for cached data
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64
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65 @param uid(unicode): unique identifier of file
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66 @return (dict, None): metadata with following keys:
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67 see [cacheData] for data details, an additional "path" key is the full path to cached file.
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68 None if file is not in cache (or cache is invalid)
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69 """
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70
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71 uid = uid.strip()
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72 if not uid:
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73 raise exceptions.InternalError(u"uid must not be empty")
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74 cache_url = self.getPath(uid)
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75 if not os.path.exists(cache_url):
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76 return None
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77
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78 try:
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79 with open(cache_url, 'rb') as f:
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80 cache_data = pickle.load(f)
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81 except IOError:
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82 log.warning(u"can't read cache at {}".format(cache_url))
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83 return None
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84 except pickle.UnpicklingError:
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85 log.warning(u'invalid cache found at {}'.format(cache_url))
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86 return None
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87
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88 try:
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89 eol = cache_data['eol']
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90 except KeyError:
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91 log.warning(u'no End Of Life found for cached file {}'.format(uid))
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92 eol = 0
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93 if eol < time.time():
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94 log.debug(u"removing expired cache (expired for {}s)".format(
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95 time.time() - eol))
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96 return None
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97
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98 cache_data['path'] = self.getPath(cache_data['filename'])
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99 return cache_data
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100
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101 def getFilePath(self, uid):
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102 """retrieve absolute path to file
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103
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104 @param uid(unicode): unique identifier of file
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105 @return (unicode, None): absolute path to cached file
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106 None if file is not in cache (or cache is invalid)
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107 """
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108 metadata = self.getMetadata(uid)
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109 if metadata is not None:
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110 return metadata['path']
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111
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112 def cacheData(self, source, uid, mime_type=None, max_age=None, filename=None):
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113 """create cache metadata and file object to use for actual data
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114
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115 @param source(unicode): source of the cache (should be plugin's import_name)
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116 @param uid(unicode): an identifier of the file which must be unique
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117 @param mime_type(unicode): MIME type of the file to cache
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118 it will be used notably to guess file extension
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119 @param max_age(int, None): maximum age in seconds
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120 the cache metadata will have an "eol" (end of life)
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121 None to use default value
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122 0 to ignore cache (file will be re-downloaded on each access)
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123 @param filename: if not None, will be used as filename
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124 else one will be generated from uid and guessed extension
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125 @return(file): file object opened in write mode
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126 you have to close it yourself (hint: use with statement)
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127 """
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128 cache_url = self.getPath(uid)
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129 if filename is None:
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130 if mime_type:
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131 ext = mimetypes.guess_extension(mime_type, strict=False)
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132 if ext is None:
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133 log.warning(u"can't find extension for MIME type {}".format(mime_type))
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134 ext = DEFAULT_EXT
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135 elif ext == u'.jpe':
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136 ext = u'.jpg'
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137 else:
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138 ext = DEFAULT_EXT
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139 mime_type = None
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140 filename = uid + ext
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141 if max_age is None:
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142 max_age = C.DEFAULT_MAX_AGE
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143 cache_data = {u'source': source,
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144 u'filename': filename,
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145 u'eol': int(time.time()) + max_age,
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146 u'mime_type': mime_type,
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147 }
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148 file_path = self.getPath(filename)
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149
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150 with open(cache_url, 'wb') as f:
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151 pickle.dump(cache_data, f, protocol=2)
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152
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153 return open(file_path, 'wb')