Mercurial > libervia-backend
annotate sat/memory/persistent.py @ 4066:e75827204fe0
plugin XEP-0092: use `client` instead of `profile_key` in `version_get`
author | Goffi <goffi@goffi.org> |
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date | Tue, 30 May 2023 22:23:55 +0200 |
parents | 524856bd7b19 |
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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 _set_cache(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.get_privates( |
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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._set_cache) |
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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.set_private_value( |
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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.del_private_value(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.del_private_namespace(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.set_private_value( |
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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.del_private_value( |
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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.set_private_value( |
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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.get_privates( |
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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.get_privates( |
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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.get_privates( |
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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.set_private_value( |
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264 self.namespace, key, value, self.binary, self.profile |
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265 ) |
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266 ) |
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267 |
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268 def __delitem__(self, key): |
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269 self.storage.del_private_value(self.namespace, key, self.binary, self.profile) |
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270 |
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271 def _default_or_exception(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._default_or_exception, 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.set_private_value( |
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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.del_private_value( |
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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.set_private_value( |
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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.del_private_value(self.namespace, key, self.binary, self.profile) |