Mercurial > libervia-backend
annotate sat/memory/persistent.py @ 3732:0fac164ff2d8
tools (xml_tools): fix `widget_args` modification in `_dataFormField2XMLUIData`:
in `textbox` widget, the first arg was modified with all values, lettings other ones
unchanger, resulting in invalid number of arguments. This has been fixed by replacing all
args with the new value.
author | Goffi <goffi@goffi.org> |
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date | Mon, 31 Jan 2022 18:35:52 +0100 |
parents | cbb988a6f507 |
children | 524856bd7b19 |
rev | line source |
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3028 | 1 #!/usr/bin/env python3 |
3137 | 2 |
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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 twisted.internet import defer |
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21 from twisted.python import failure |
771 | 22 from sat.core.i18n import _ |
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23 from sat.core.log import getLogger |
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24 |
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25 |
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26 log = getLogger(__name__) |
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27 |
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28 |
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29 class MemoryNotInitializedError(Exception): |
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30 pass |
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31 |
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32 |
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33 class PersistentDict: |
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34 r"""A dictionary which save persistently each value assigned |
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35 |
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36 /!\ be careful, each assignment means a database write |
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37 /!\ Memory must be initialised before loading/setting value with instances of this class""" |
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38 storage = None |
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39 binary = False |
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40 |
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41 def __init__(self, namespace, profile=None): |
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42 """ |
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43 |
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44 @param namespace: unique namespace for this dictionary |
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45 @param profile(unicode, None): profile which *MUST* exists, or None for general values |
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46 """ |
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47 if not self.storage: |
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48 log.error(_("PersistentDict can't be used before memory initialisation")) |
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49 raise MemoryNotInitializedError |
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50 self._cache = {} |
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51 self.namespace = namespace |
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52 self.profile = profile |
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53 |
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54 def _setCache(self, data): |
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55 self._cache = data |
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56 |
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57 def load(self): |
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58 """Load persistent data from storage. |
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59 |
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60 need to be called before any other operation |
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61 @return: defers the PersistentDict instance itself |
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62 """ |
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63 d = defer.ensureDeferred(self.storage.getPrivates( |
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64 self.namespace, binary=self.binary, profile=self.profile |
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65 )) |
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66 d.addCallback(self._setCache) |
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67 d.addCallback(lambda __: self) |
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68 return d |
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69 |
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70 def iteritems(self): |
3028 | 71 return iter(self._cache.items()) |
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72 |
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73 def items(self): |
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74 return self._cache.items() |
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75 |
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76 def __repr__(self): |
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77 return self._cache.__repr__() |
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78 |
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79 def __str__(self): |
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80 return self._cache.__str__() |
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81 |
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82 def __lt__(self, other): |
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83 return self._cache.__lt__(other) |
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84 |
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85 def __le__(self, other): |
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86 return self._cache.__le__(other) |
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87 |
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88 def __eq__(self, other): |
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89 return self._cache.__eq__(other) |
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90 |
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91 def __ne__(self, other): |
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92 return self._cache.__ne__(other) |
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93 |
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94 def __gt__(self, other): |
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95 return self._cache.__gt__(other) |
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96 |
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97 def __ge__(self, other): |
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98 return self._cache.__ge__(other) |
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99 |
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100 def __cmp__(self, other): |
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101 return self._cache.__cmp__(other) |
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102 |
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103 def __hash__(self): |
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104 return self._cache.__hash__() |
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105 |
3028 | 106 def __bool__(self): |
107 return self._cache.__len__() != 0 | |
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108 |
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109 def __contains__(self, key): |
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110 return self._cache.__contains__(key) |
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111 |
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112 def __iter__(self): |
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113 return self._cache.__iter__() |
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114 |
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115 def __getitem__(self, key): |
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116 return self._cache.__getitem__(key) |
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117 |
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118 def __setitem__(self, key, value): |
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119 defer.ensureDeferred( |
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120 self.storage.setPrivateValue( |
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121 self.namespace, key, value, self.binary, self.profile |
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122 ) |
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123 ) |
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124 return self._cache.__setitem__(key, value) |
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125 |
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126 def __delitem__(self, key): |
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127 self.storage.delPrivateValue(self.namespace, key, self.binary, self.profile) |
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128 return self._cache.__delitem__(key) |
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129 |
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130 def clear(self): |
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131 """Delete all values from this namespace""" |
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132 self._cache.clear() |
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133 return self.storage.delPrivateNamespace(self.namespace, self.binary, self.profile) |
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134 |
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135 def get(self, key, default=None): |
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136 return self._cache.get(key, default) |
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137 |
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138 def aset(self, key, value): |
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139 """Async set, return a Deferred fired when value is actually stored""" |
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140 self._cache.__setitem__(key, value) |
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141 return defer.ensureDeferred( |
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142 self.storage.setPrivateValue( |
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143 self.namespace, key, value, self.binary, self.profile |
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144 ) |
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145 ) |
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146 |
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147 def adel(self, key): |
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148 """Async del, return a Deferred fired when value is actually deleted""" |
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149 self._cache.__delitem__(key) |
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150 return self.storage.delPrivateValue( |
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151 self.namespace, key, self.binary, self.profile) |
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152 |
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153 def setdefault(self, key, default): |
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154 try: |
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155 return self._cache[key] |
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156 except: |
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157 self.__setitem__(key, default) |
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158 return default |
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159 |
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160 def force(self, name): |
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161 """Force saving of an attribute to storage |
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162 |
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163 @return: deferred fired when data is actually saved |
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164 """ |
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165 return defer.ensureDeferred( |
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166 self.storage.setPrivateValue( |
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167 self.namespace, name, self._cache[name], self.binary, self.profile |
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168 ) |
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169 ) |
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170 |
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171 |
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172 class PersistentBinaryDict(PersistentDict): |
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173 """Persistent dict where value can be any python data (instead of string only)""" |
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174 binary = True |
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175 |
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176 |
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177 class LazyPersistentBinaryDict(PersistentBinaryDict): |
3028 | 178 r"""PersistentBinaryDict which get key/value when needed |
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179 |
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180 This Persistent need more database access, it is suitable for largest data, |
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181 to save memory. |
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182 /!\ most of methods return a Deferred |
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183 """ |
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184 # TODO: missing methods should be implemented using database access |
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185 # TODO: a cache would be useful (which is deleted after a timeout) |
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186 |
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187 def load(self): |
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188 # we show a warning as calling load on LazyPersistentBinaryDict sounds like a code mistake |
3028 | 189 log.warning(_("Calling load on LazyPersistentBinaryDict while it's not needed")) |
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190 |
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191 def iteritems(self): |
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192 raise NotImplementedError |
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193 |
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194 def items(self): |
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195 d = defer.ensureDeferred(self.storage.getPrivates( |
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196 self.namespace, binary=self.binary, profile=self.profile |
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197 )) |
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198 d.addCallback(lambda data_dict: data_dict.items()) |
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199 return d |
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200 |
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201 def all(self): |
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202 return defer.ensureDeferred(self.storage.getPrivates( |
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203 self.namespace, binary=self.binary, profile=self.profile |
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204 )) |
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205 |
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206 def __repr__(self): |
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207 return self.__str__() |
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208 |
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209 def __str__(self): |
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210 return "LazyPersistentBinaryDict (namespace: {})".format(self.namespace) |
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211 |
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212 def __lt__(self, other): |
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213 raise NotImplementedError |
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214 |
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215 def __le__(self, other): |
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216 raise NotImplementedError |
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217 |
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218 def __eq__(self, other): |
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219 raise NotImplementedError |
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220 |
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221 def __ne__(self, other): |
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222 raise NotImplementedError |
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223 |
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224 def __gt__(self, other): |
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225 raise NotImplementedError |
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226 |
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227 def __ge__(self, other): |
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228 raise NotImplementedError |
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229 |
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230 def __cmp__(self, other): |
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231 raise NotImplementedError |
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232 |
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233 def __hash__(self): |
3028 | 234 return hash(str(self.__class__) + self.namespace + (self.profile or '')) |
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235 |
3028 | 236 def __bool__(self): |
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237 raise NotImplementedError |
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238 |
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239 def __contains__(self, key): |
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240 raise NotImplementedError |
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241 |
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242 def __iter__(self): |
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243 raise NotImplementedError |
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244 |
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245 def _data2value(self, data, key): |
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246 try: |
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247 return data[key] |
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248 except KeyError as e: |
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249 # we return a Failure here to avoid the jump |
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250 # into debugger in debug mode. |
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251 raise failure.Failure(e) |
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252 |
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253 def __getitem__(self, key): |
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254 """get the value as a Deferred""" |
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255 d = defer.ensureDeferred(self.storage.getPrivates( |
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256 self.namespace, keys=[key], binary=self.binary, profile=self.profile |
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257 )) |
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258 d.addCallback(self._data2value, key) |
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259 return d |
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260 |
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261 def __setitem__(self, key, value): |
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262 defer.ensureDeferred( |
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263 self.storage.setPrivateValue( |
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264 self.namespace, key, value, self.binary, self.profile |
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265 ) |
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266 ) |
432
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267 |
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268 def __delitem__(self, key): |
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269 self.storage.delPrivateValue(self.namespace, key, self.binary, self.profile) |
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270 |
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271 def _defaultOrException(self, failure_, default): |
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272 failure_.trap(KeyError) |
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273 return default |
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274 |
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275 def get(self, key, default=None): |
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276 d = self.__getitem__(key) |
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277 d.addErrback(self._defaultOrException, default=default) |
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278 return d |
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279 |
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280 def aset(self, key, value): |
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281 """Async set, return a Deferred fired when value is actually stored""" |
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282 # FIXME: redundant with force, force must be removed |
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283 # XXX: similar as PersistentDict.aset, but doesn't use cache |
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284 return defer.ensureDeferred( |
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285 self.storage.setPrivateValue( |
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286 self.namespace, key, value, self.binary, self.profile |
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287 ) |
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288 ) |
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289 |
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290 def adel(self, key): |
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291 """Async del, return a Deferred fired when value is actually deleted""" |
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292 # XXX: similar as PersistentDict.adel, but doesn't use cache |
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293 return self.storage.delPrivateValue( |
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294 self.namespace, key, self.binary, self.profile) |
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295 |
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296 def setdefault(self, key, default): |
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297 raise NotImplementedError |
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298 |
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299 def force(self, name, value): |
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300 """Force saving of an attribute to storage |
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301 |
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302 @param value(object): value is needed for LazyPersistentBinaryDict |
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303 @return: deferred fired when data is actually saved |
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304 """ |
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305 return defer.ensureDeferred( |
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306 self.storage.setPrivateValue( |
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307 self.namespace, name, value, self.binary, self.profile |
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308 ) |
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309 ) |
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310 |
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311 def remove(self, key): |
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312 """Delete a key from sotrage, and return a deferred called when it's done |
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313 |
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314 @param key(unicode): key to delete |
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315 @return (D): A deferred fired when delete is done |
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316 """ |
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317 return self.storage.delPrivateValue(self.namespace, key, self.binary, self.profile) |