Mercurial > libervia-backend
annotate libervia/backend/memory/persistent.py @ 4322:00837fa13e5a default tip @
tools (common/template), cli (call/gui): use font-awesome instead of fontello:
following change in Libervia Media, code has been updated to use font-awesome now instead
of fontello.
author | Goffi <goffi@goffi.org> |
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date | Sat, 26 Oct 2024 22:42:17 +0200 |
parents | 0d7bb4df2343 |
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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 |
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22 from libervia.backend.core.i18n import _ |
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23 from libervia.backend.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 """ |
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39 |
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40 storage = None |
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41 binary = False |
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42 |
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43 def __init__(self, namespace, profile=None): |
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44 """ |
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45 |
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46 @param namespace: unique namespace for this dictionary |
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47 @param profile(unicode, None): profile which *MUST* exists, or None for general values |
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48 """ |
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49 if not self.storage: |
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50 log.error(_("PersistentDict can't be used before memory initialisation")) |
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51 raise MemoryNotInitializedError |
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52 self._cache = {} |
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53 self.namespace = namespace |
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54 self.profile = profile |
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55 |
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56 def _set_cache(self, data): |
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57 self._cache = data |
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58 |
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59 def load(self): |
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60 """Load persistent data from storage. |
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61 |
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62 need to be called before any other operation |
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63 @return: defers the PersistentDict instance itself |
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64 """ |
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65 d = defer.ensureDeferred( |
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66 self.storage.get_privates( |
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67 self.namespace, binary=self.binary, profile=self.profile |
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68 ) |
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69 ) |
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70 d.addCallback(self._set_cache) |
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71 d.addCallback(lambda __: self) |
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72 return d |
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73 |
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74 def iteritems(self): |
3028 | 75 return iter(self._cache.items()) |
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76 |
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77 def items(self): |
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78 return self._cache.items() |
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79 |
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80 def __repr__(self): |
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81 return self._cache.__repr__() |
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82 |
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83 def __str__(self): |
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84 return self._cache.__str__() |
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85 |
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86 def __lt__(self, other): |
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87 return self._cache.__lt__(other) |
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88 |
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89 def __le__(self, other): |
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90 return self._cache.__le__(other) |
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91 |
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92 def __eq__(self, other): |
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93 return self._cache.__eq__(other) |
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94 |
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95 def __ne__(self, other): |
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96 return self._cache.__ne__(other) |
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97 |
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98 def __gt__(self, other): |
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99 return self._cache.__gt__(other) |
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100 |
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101 def __ge__(self, other): |
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102 return self._cache.__ge__(other) |
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103 |
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104 def __cmp__(self, other): |
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105 return self._cache.__cmp__(other) |
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106 |
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107 def __hash__(self): |
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108 return self._cache.__hash__() |
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109 |
3028 | 110 def __bool__(self): |
111 return self._cache.__len__() != 0 | |
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112 |
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113 def __contains__(self, key): |
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114 return self._cache.__contains__(key) |
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115 |
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116 def __iter__(self): |
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117 return self._cache.__iter__() |
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118 |
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119 def __getitem__(self, key): |
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120 return self._cache.__getitem__(key) |
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121 |
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122 def __setitem__(self, key, value): |
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123 defer.ensureDeferred( |
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124 self.storage.set_private_value( |
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125 self.namespace, key, value, self.binary, self.profile |
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126 ) |
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127 ) |
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128 return self._cache.__setitem__(key, value) |
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129 |
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130 def __delitem__(self, key): |
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131 self.storage.del_private_value(self.namespace, key, self.binary, self.profile) |
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132 return self._cache.__delitem__(key) |
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133 |
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134 def clear(self): |
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135 """Delete all values from this namespace""" |
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136 self._cache.clear() |
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137 return self.storage.del_private_namespace( |
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138 self.namespace, self.binary, self.profile |
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139 ) |
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140 |
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141 def get(self, key, default=None): |
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142 return self._cache.get(key, default) |
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143 |
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144 def aset(self, key, value): |
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145 """Async set, return a Deferred fired when value is actually stored""" |
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146 self._cache.__setitem__(key, value) |
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147 return defer.ensureDeferred( |
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148 self.storage.set_private_value( |
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149 self.namespace, key, value, self.binary, self.profile |
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150 ) |
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151 ) |
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152 |
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153 def adel(self, key): |
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154 """Async del, return a Deferred fired when value is actually deleted""" |
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155 self._cache.__delitem__(key) |
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156 return self.storage.del_private_value( |
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157 self.namespace, key, self.binary, self.profile |
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158 ) |
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159 |
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160 def setdefault(self, key, default): |
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161 try: |
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162 return self._cache[key] |
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163 except: |
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164 self.__setitem__(key, default) |
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165 return default |
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166 |
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167 def force(self, name): |
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168 """Force saving of an attribute to storage |
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169 |
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170 @return: deferred fired when data is actually saved |
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171 """ |
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172 return defer.ensureDeferred( |
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173 self.storage.set_private_value( |
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174 self.namespace, name, self._cache[name], self.binary, self.profile |
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175 ) |
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176 ) |
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177 |
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178 |
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179 class PersistentBinaryDict(PersistentDict): |
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180 """Persistent dict where value can be any python data (instead of string only)""" |
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181 |
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182 binary = True |
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183 |
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184 |
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185 class LazyPersistentBinaryDict(PersistentBinaryDict): |
3028 | 186 r"""PersistentBinaryDict which get key/value when needed |
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187 |
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188 This Persistent need more database access, it is suitable for largest data, |
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189 to save memory. |
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190 /!\ most of methods return a Deferred |
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191 """ |
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192 |
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193 # TODO: missing methods should be implemented using database access |
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194 # TODO: a cache would be useful (which is deleted after a timeout) |
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195 |
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196 def load(self): |
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197 # we show a warning as calling load on LazyPersistentBinaryDict sounds like a code mistake |
3028 | 198 log.warning(_("Calling load on LazyPersistentBinaryDict while it's not needed")) |
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199 |
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200 def iteritems(self): |
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201 raise NotImplementedError |
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202 |
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203 def items(self): |
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204 d = defer.ensureDeferred( |
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205 self.storage.get_privates( |
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206 self.namespace, binary=self.binary, profile=self.profile |
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207 ) |
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208 ) |
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209 d.addCallback(lambda data_dict: data_dict.items()) |
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210 return d |
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211 |
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212 def all(self): |
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213 return defer.ensureDeferred( |
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214 self.storage.get_privates( |
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215 self.namespace, binary=self.binary, profile=self.profile |
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216 ) |
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217 ) |
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218 |
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219 def __repr__(self): |
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220 return self.__str__() |
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221 |
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222 def __str__(self): |
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223 return "LazyPersistentBinaryDict (namespace: {})".format(self.namespace) |
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224 |
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225 def __lt__(self, other): |
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226 raise NotImplementedError |
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227 |
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228 def __le__(self, other): |
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229 raise NotImplementedError |
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230 |
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231 def __eq__(self, other): |
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232 raise NotImplementedError |
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233 |
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234 def __ne__(self, other): |
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235 raise NotImplementedError |
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236 |
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237 def __gt__(self, other): |
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238 raise NotImplementedError |
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239 |
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240 def __ge__(self, other): |
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241 raise NotImplementedError |
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242 |
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243 def __cmp__(self, other): |
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244 raise NotImplementedError |
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245 |
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246 def __hash__(self): |
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247 return hash(str(self.__class__) + self.namespace + (self.profile or "")) |
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248 |
3028 | 249 def __bool__(self): |
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250 raise NotImplementedError |
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251 |
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252 def __contains__(self, key): |
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253 raise NotImplementedError |
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254 |
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255 def __iter__(self): |
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256 raise NotImplementedError |
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257 |
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258 def _data2value(self, data, key): |
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259 try: |
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260 return data[key] |
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261 except KeyError as e: |
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262 # we return a Failure here to avoid the jump |
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263 # into debugger in debug mode. |
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264 raise failure.Failure(e) |
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265 |
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266 def __getitem__(self, key): |
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267 """get the value as a Deferred""" |
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268 d = defer.ensureDeferred( |
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269 self.storage.get_privates( |
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270 self.namespace, keys=[key], binary=self.binary, profile=self.profile |
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271 ) |
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272 ) |
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273 d.addCallback(self._data2value, key) |
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274 return d |
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275 |
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276 def __setitem__(self, key, value): |
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277 defer.ensureDeferred( |
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278 self.storage.set_private_value( |
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279 self.namespace, key, value, self.binary, self.profile |
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280 ) |
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281 ) |
432
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282 |
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283 def __delitem__(self, key): |
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284 self.storage.del_private_value(self.namespace, key, self.binary, self.profile) |
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285 |
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286 def _default_or_exception(self, failure_, default): |
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287 failure_.trap(KeyError) |
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288 return default |
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289 |
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290 def get(self, key, default=None): |
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291 d = self.__getitem__(key) |
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292 d.addErrback(self._default_or_exception, default=default) |
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293 return d |
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294 |
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295 def aset(self, key, value): |
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296 """Async set, return a Deferred fired when value is actually stored""" |
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297 # FIXME: redundant with force, force must be removed |
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298 # XXX: similar as PersistentDict.aset, but doesn't use cache |
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299 return defer.ensureDeferred( |
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300 self.storage.set_private_value( |
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301 self.namespace, key, value, self.binary, self.profile |
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302 ) |
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303 ) |
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304 |
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305 def adel(self, key): |
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306 """Async del, return a Deferred fired when value is actually deleted""" |
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307 # XXX: similar as PersistentDict.adel, but doesn't use cache |
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308 return self.storage.del_private_value( |
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309 self.namespace, key, self.binary, self.profile |
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310 ) |
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311 |
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312 def setdefault(self, key, default): |
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313 raise NotImplementedError |
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314 |
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315 def force(self, name, value): |
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316 """Force saving of an attribute to storage |
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317 |
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318 @param value(object): value is needed for LazyPersistentBinaryDict |
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319 @return: deferred fired when data is actually saved |
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320 """ |
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321 return defer.ensureDeferred( |
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322 self.storage.set_private_value( |
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323 self.namespace, name, value, self.binary, self.profile |
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324 ) |
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325 ) |
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326 |
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327 def remove(self, key): |
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328 """Delete a key from sotrage, and return a deferred called when it's done |
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329 |
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330 @param key(unicode): key to delete |
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331 @return (D): A deferred fired when delete is done |
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332 """ |
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333 return self.storage.del_private_value( |
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334 self.namespace, key, self.binary, self.profile |
0d7bb4df2343
Reformatted code base using black.
Goffi <goffi@goffi.org>
parents:
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335 ) |