annotate idavoll/storage.py @ 137:aca904a41a43

Discover client_encoding parameter to pyPgSQL.
author Ralph Meijer <ralphm@ik.nu>
date Mon, 25 Apr 2005 12:58:59 +0000
parents b27a66637a10
children 812300cdbc22
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1 from zope.interface import Interface
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2 from twisted.words.protocols.jabber import jid
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3 from twisted.xish import domish
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4
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5 class Error(Exception):
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6 msg = None
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7
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8 class NodeNotFound(Error):
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9 pass
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10
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11 class NodeExists(Error):
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12 pass
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14 class SubscriptionNotFound(Error):
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15 pass
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16
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17 class SubscriptionExists(Error):
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18 pass
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19
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20 class ItemNotFound(Error):
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21 pass
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22
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23 class IStorage(Interface):
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24 """ Storage interface """
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25
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26 def get_node(self, node_id):
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27 """ Get Node.
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28
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29 @param node_id: NodeID of the desired node.
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30 @type node_id: L{str}
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31 @return: deferred that returns a L{Node} object.
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32 """
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33
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34 def get_node_ids(self):
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35 """ Return all NodeIDs.
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36
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37 @return: deferred that returns a list of NodeIDs (L{str}).
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38 """
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40 def create_node(self, node_id, owner, config = None, type='leaf'):
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41 """ Create new node.
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42
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43 The implementation should make sure, the passed owner JID is stripped
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44 of the resource (e.g. using C{owner.userhostJID()}).
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45
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46 @param node_id: NodeID of the new node.
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47 @type node_id: L{str}
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48 @param owner: JID of the new nodes's owner.
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49 @type owner: L{jid.JID}
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50 @param config: Configuration
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51 @param type: Node type. Can be either C{'leaf'} or C{'collection'}.
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52 @return: deferred that fires on creation.
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53 """
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54
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55 def delete_node(self, node_id):
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56 """ Delete a node.
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57
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58 @param node_id: NodeID of the new node.
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59 @type node_id: L{str}
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60 @return: deferred that fires on deletion.
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61 """
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63 def get_affiliations(self, entity):
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64 """ Get all affiliations for entity.
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65
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66 The implementation should make sure, the passed owner JID is stripped
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67 of the resource (e.g. using C{owner.userhostJID()}).
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68
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69 @param entity: JID of the entity.
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70 @type entity: L{jid.JID}
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71 @return: deferred that returns a L{list} of tuples of the form
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72 C{(node_id, affiliation)}, where C{node_id} is of the type
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73 L{str} and C{affiliation} is one of C{'owner'}, C{'publisher'}
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74 and C{'outcast'}.
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75 """
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76
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77 def get_subscriptions(self, entity):
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78 """ Get all subscriptions for an entity.
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79
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80 The implementation should make sure, the passed owner JID is stripped
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81 of the resource (e.g. using C{owner.userhostJID()}).
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82
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83 @param entity: JID of the entity.
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84 @type entity: L{jid.JID}
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85 @return: deferred that returns a L{list} of tuples of the form
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86 C{(node_id, subscriber, state)}, where C{node_id} is of the
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87 type L{str}, C{subscriber} of the type {jid.JID}, and
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88 C{state} is C{'subscribed'} or C{'pending'}.
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89 """
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91
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92 class INode(Interface):
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93 """ Interface to the class of objects that represent nodes. """
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94
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95 def get_type(self):
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96 """ Get node's type.
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97
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98 @return: C{'leaf'} or C{'collection'}.
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99 """
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100
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101 def get_configuration(self):
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102 """ Get node's configuration.
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103
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104 The configuration must at least have two options:
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105 C{pubsub#persist_items}, and C{pubsub#deliver_payloads}.
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106
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107 @return: L{dict} of configuration options.
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108 """
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110 def get_meta_data(self):
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111 """ Get node's meta data.
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112
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113 The meta data must be a superset of the configuration options, and
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114 also at least should have a C{pubsub#node_type} entry.
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115
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116 @return: L{dict} of meta data.
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117 """
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119 def set_configuration(self, options):
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120 """ Set node's configuration.
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121
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122 The elements of {options} will set the new values for those
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123 configuration items. This means that only changing items have to
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124 be given.
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125
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126 @param options: a dictionary of configuration options.
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127 @returns: a deferred that fires upon success.
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128 """
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130 def get_affiliation(self, entity):
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131 """ Get affiliation of entity with this node.
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132
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133 @param entity: JID of entity.
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134 @type entity: L{jid.JID}
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135 @return: deferred that returns C{'owner'}, C{'publisher'}, C{'outcast'}
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136 or C{None}.
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137 """
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138
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139 def get_subscription(self, subscriber):
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140 """ Get subscription to this node of subscriber.
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141
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142 @param subscriber: JID of the new subscriptions' entity.
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143 @type subscriber: L{jid.JID}
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144 @return: deferred that returns the subscription state (C{'subscribed'},
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145 C{'pending'} or C{None}).
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146 """
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147
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148 def add_subscription(self, subscriber, state):
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149 """ Add new subscription to this node with given state.
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150
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151 @param subscriber: JID of the new subscriptions' entity.
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152 @type subscriber: L{jid.JID}
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153 @param state: C{'subscribed'} or C{'pending'}
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154 @type state: L{str}
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155 @return: deferred that fires on subscription.
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156 """
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157
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158 def remove_subscription(self, subscriber):
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159 """ Remove subscription to this node.
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160
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161 @param subscriber: JID of the subscriptions' entity.
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162 @type subscriber: L{jid.JID}
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163 @return: deferred that fires on removal.
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164 """
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165
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166 def get_subscribers(self):
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167 """ Get list of subscribers to this node.
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168
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169 Retrieves the list of entities that have a subscription to this
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170 node. That is, having the state C{'subscribed'}.
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171
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172 @return: a deferred that returns a L{list} of L{jid.JID}s.
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173 """
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174
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175 def is_subscribed(self, subscriber):
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176 """ Returns whether subscriber has a subscription to this node.
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177
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178 Only returns C{True} when the subscription state (if present) is
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179 C{'subscribed'}.
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180
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181 @param subscriber: JID of the subscriptions' entity.
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182 @type subscriber: L{jid.JID}
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183 @return: deferred that returns a L{bool}.
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184 """
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185
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186 class ILeafNode(Interface):
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187 """ Interface to the class of objects that represent leaf nodes. """
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188
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189 def store_items(self, items, publisher):
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190 """ Store items in persistent storage for later retrieval.
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191
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192 @param items: The list of items to be stored. Each item is the
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193 L{domish} representation of the XML fragment as defined
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194 for C{<item/>} in the
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195 C{http://jabber.org/protocol/pubsub} namespace.
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196 @type items: L{list} of {domish.Element}
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197 @param publisher: JID of the publishing entity.
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198 @type publisher: L{jid.JID}
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199 @return: deferred that fires upon success.
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200 """
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201
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202 def remove_items(self, item_ids):
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203 """ Remove items by id
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204
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205 @param item_ids: L{list} of item ids.
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206 @return: deferred that fires when all given items were deleted, or
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207 a failure if one of them was not found.
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208 """
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209
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210 def get_items(self, max_items=None):
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211 """ Get items.
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212
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213 If C{max_items} is not given, all items in the node are returned,
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214 just like C{get_items_by_id}. Otherwise, C{max_items} limits
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215 the returned items to a maximum of that number of most recently
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216 published items.
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217
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218 @param max_items: if given, a natural number (>0) that limits the
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219 returned number of items.
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220 @return: deferred that fires with a C{list} of found items.
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221 """
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222
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223 def get_items_by_id(self, item_ids):
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224 """ Get items by item id.
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225
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226 Each item in the returned list is a unicode string that
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227 represent the XML of the item as it was published, including the
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228 item wrapper with item id.
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229
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230 @param item_ids: L{list} of item ids.
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231 @return: deferred that fires with a C{list} of found items.
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232 """
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233
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234 def purge(self):
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235 """ Purge node of all items in persistent storage.
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236
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237 @return: deferred that fires when the node has been purged.
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238 """
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239
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240
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241 class ISubscription(Interface):
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242 """ """