Mercurial > libervia-pubsub
annotate idavoll/backend.py @ 101:b75fcc554358
Added support for disco info meta data.
author | Ralph Meijer <ralphm@ik.nu> |
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date | Sun, 02 Jan 2005 20:10:02 +0000 |
parents | b9c449f4c167 |
children | 8d8946e67fcb |
rev | line source |
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49
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Implement SubscriptionService with separate storage.
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1 from twisted.protocols.jabber import jid |
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2 from twisted.python import components |
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3 from twisted.application import service |
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4 from twisted.xish import utility |
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5 from twisted.internet import defer |
84 | 6 import sha |
7 import time | |
2 | 8 |
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9 class Error(Exception): |
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10 msg = '' |
1 | 11 |
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12 def __str__(self): |
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13 return self.msg |
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14 |
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15 class NodeNotFound(Error): |
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16 msg = 'Node not found' |
1 | 17 |
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18 class NotAuthorized(Error): |
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19 pass |
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Added two exceptions: NoInstantNodes and NodeExists.
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20 |
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21 class PayloadExpected(Error): |
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22 msg = 'Payload expected' |
15 | 23 |
24
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24 class NoPayloadAllowed(Error): |
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25 msg = 'No payload allowed' |
2 | 26 |
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27 class NoInstantNodes(Error): |
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28 pass |
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29 |
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30 class NodeExists(Error): |
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31 pass |
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32 |
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33 class NotImplemented(Error): |
34 | 34 pass |
35 | |
36 class NotSubscribed(Error): | |
37 pass | |
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38 |
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39 class IBackendService(components.Interface): |
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40 """ Interface to a backend service of a pubsub service. """ |
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41 |
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42 def get_supported_affiliations(self): |
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43 """ Reports the list of supported affiliation types. |
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44 |
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45 @return: a list of supported affiliation types. |
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46 """ |
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47 |
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48 class INodeCreationService(components.Interface): |
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49 """ A service for creating nodes """ |
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50 |
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51 def create_node(self, node_id, requestor): |
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52 """ Create a node. |
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53 |
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54 @return: a deferred that fires when the node has been created. |
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55 """ |
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56 |
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57 class INodeDeletionService(components.Interface): |
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58 """ A service for deleting nodes. """ |
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59 |
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60 def register_pre_delete(self, pre_delete_fn): |
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61 """ Register a callback that is called just before a node deletion. |
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62 |
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63 The function C{pre_deleted_fn} is added to a list of functions |
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64 to be called just before deletion of a node. The callback |
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65 C{pre_delete_fn} is called with the C{node_id} that is about to be |
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66 deleted and should return a deferred that returns a list of deferreds |
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67 that are to be fired after deletion. The backend collects the lists |
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68 from all these callbacks before actually deleting the node in question. |
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69 After deletion all collected deferreds are fired to do post-processing. |
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70 |
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71 The idea is that you want to be able to collect data from the |
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72 node before deleting it, for example to get a list of subscribers |
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73 that have to be notified after the node has been deleted. To do this, |
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74 C{pre_delete_fn} fetches the subscriber list and passes this |
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75 list to a callback attached to a deferred that it sets up. This |
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76 deferred is returned in the list of deferreds. |
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77 """ |
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78 |
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79 def get_subscribers(self, node_id): |
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80 """ Get node subscriber list. |
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81 |
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82 @return: a deferred that fires with the list of subscribers. |
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83 """ |
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84 |
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85 def delete_node(self, node_id, requestor): |
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86 """ Delete a node. |
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87 |
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88 @return: a deferred that fires when the node has been deleted. |
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89 """ |
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90 |
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91 class IPublishService(components.Interface): |
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92 """ A service for publishing items to a node. """ |
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93 |
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94 def publish(self, node_id, items, requestor): |
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95 """ Publish items to a pubsub node. |
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96 |
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97 @return: a deferred that fires when the items have been published. |
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98 """ |
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99 class INotificationService(components.Interface): |
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100 """ A service for notification of published items. """ |
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101 |
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102 def register_notifier(self, observerfn, *args, **kwargs): |
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103 """ Register callback which is called for notification. """ |
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104 |
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105 def get_notification_list(self, node_id, items): |
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106 pass |
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107 |
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108 class ISubscriptionService(components.Interface): |
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109 """ A service for managing subscriptions. """ |
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110 |
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111 def subscribe(self, node_id, subscriber, requestor): |
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112 """ Request the subscription of an entity to a pubsub node. |
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113 |
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114 Depending on the node's configuration and possible business rules, the |
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115 C{subscriber} is added to the list of subscriptions of the node with id |
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116 C{node_id}. The C{subscriber} might be different from the C{requestor}, |
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117 and if the C{requestor} is not allowed to subscribe this entity an |
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118 exception should be raised. |
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119 |
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120 @return: a deferred that returns the subscription state |
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121 """ |
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122 |
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123 def unsubscribe(self, node_id, subscriber, requestor): |
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124 """ Cancel the subscription of an entity to a pubsub node. |
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125 |
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126 The subscription of C{subscriber} is removed from the list of |
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127 subscriptions of the node with id C{node_id}. If the C{requestor} |
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128 is not allowed to unsubscribe C{subscriber}, an an exception should |
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129 be raised. |
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130 |
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131 @return: a deferred that fires when unsubscription is complete. |
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132 """ |
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133 |
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134 class IAffiliationsService(components.Interface): |
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135 """ A service for retrieving the affiliations with this pubsub service. """ |
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136 |
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137 def get_affiliations(self, entity): |
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138 """ Report the list of current affiliations with this pubsub service. |
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139 |
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140 Report the list of the current affiliations with all nodes within this |
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141 pubsub service, along with subscriptions to such nodes, for the |
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142 C{entity}. |
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143 |
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144 @return: a deferred that returns the list of all current affiliations |
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145 and subscriptions. |
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146 """ |
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147 |
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148 class IRetractionService(components.Interface): |
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149 """ A service for retracting published items """ |
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150 |
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151 def retract_item(self, node_id, item_id, requestor): |
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152 """ Removes item in node from persistent storage """ |
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153 |
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154 def purge_node(self, node_id, requestor): |
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155 """ Removes all items in node from persistent storage """ |
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156 |
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157 class IItemRetrievalService(components.Interface): |
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158 """ A service for retrieving previously published items. """ |
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159 |
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160 def get_items(self, node_id, requestor, max_items=None, item_ids=[]): |
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161 """ Retrieve items from persistent storage |
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162 |
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163 If C{max_items} is given, return the C{max_items} last published |
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164 items, else if C{item_ids} is not empty, return the items requested. |
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165 If neither is given, return all items. |
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166 |
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167 @return: a deferred that returns the requested items |
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168 """ |
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169 |
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170 class BackendService(service.MultiService, utility.EventDispatcher): |
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171 |
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172 __implements__ = IBackendService, |
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173 |
101
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174 options = {"pubsub#persist_items": |
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175 {"type": "boolean", |
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176 "label": "Persist items to storage"}, |
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177 "pubsub#deliver_payloads": |
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178 {"type": "boolean", |
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179 "label": "Deliver payloads with event notifications"}, |
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180 } |
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181 |
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182 default_config = {"pubsub#persist_items": True, |
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183 "pubsub#deliver_payloads": True, |
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184 } |
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185 |
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186 def __init__(self, storage): |
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187 service.MultiService.__init__(self) |
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188 utility.EventDispatcher.__init__(self) |
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189 self.storage = storage |
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190 |
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191 def supports_publisher_affiliation(self): |
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192 return True |
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193 |
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194 def supports_outcast_affiliation(self): |
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195 return True |
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196 |
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197 def supports_persistent_items(self): |
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198 return True |
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199 |
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200 def get_node_type(self, node_id): |
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201 return self.storage.get_node_type(node_id) |
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202 |
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203 def get_nodes(self): |
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204 return self.storage.get_nodes() |
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205 |
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206 def get_node_meta_data(self, node_id): |
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207 d = self.storage.get_node_configuration(node_id) |
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208 |
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209 d.addCallback(self._make_meta_data) |
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210 return d |
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211 |
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212 def _make_meta_data(self, meta_data): |
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213 options = [] |
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214 for key, value in meta_data.iteritems(): |
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215 if self.options.has_key(key): |
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216 option = {"var": key} |
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217 option.update(self.options[key]) |
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218 option["value"] = value |
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219 options.append(option) |
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220 |
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221 return options |
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222 |
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223 class PublishService(service.Service): |
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224 |
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225 __implements__ = IPublishService, |
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226 |
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227 def publish(self, node_id, items, requestor): |
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228 d1 = self.parent.storage.get_node_configuration(node_id) |
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229 d2 = self.parent.storage.get_affiliation(node_id, requestor) |
92
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230 d = defer.DeferredList([d1, d2], fireOnOneErrback=1, consumeErrors=1) |
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231 d.addErrback(lambda x: x.value[0]) |
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232 d.addCallback(self._do_publish, node_id, items, requestor) |
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233 return d |
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234 |
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235 def _do_publish(self, result, node_id, items, requestor): |
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236 configuration = result[0][1] |
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237 persist_items = configuration["pubsub#persist_items"] |
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238 deliver_payloads = configuration["pubsub#deliver_payloads"] |
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239 affiliation = result[1][1] |
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240 |
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241 if affiliation not in ['owner', 'publisher']: |
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242 raise NotAuthorized |
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243 |
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244 if items and not persist_items and not deliver_payloads: |
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245 raise NoPayloadAllowed |
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246 elif not items and (persist_items or deliver_payloads): |
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247 raise PayloadExpected |
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248 |
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249 if persist_items or deliver_payloads: |
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250 for item in items: |
84 | 251 if not item.getAttribute("id"): |
252 item["id"] = sha.new(str(time.time()) + | |
253 requestor.full()).hexdigest() | |
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254 |
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255 if persist_items: |
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256 d = self.parent.storage.store_items(node_id, items, |
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257 requestor) |
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258 else: |
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259 d = defer.succeed(None) |
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260 |
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261 d.addCallback(self._do_notify, node_id, items, deliver_payloads) |
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262 |
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263 def _do_notify(self, result, node_id, items, deliver_payloads): |
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264 if items and not deliver_payloads: |
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265 for item in items: |
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266 item.children = [] |
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267 |
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268 self.parent.dispatch({ 'items': items, 'node_id': node_id }, |
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269 '//event/pubsub/notify') |
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270 |
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271 class NotificationService(service.Service): |
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272 |
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273 __implements__ = INotificationService, |
43
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274 |
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275 def get_notification_list(self, node_id, items): |
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276 d = self.parent.storage.get_subscribers(node_id) |
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277 d.addCallback(self._magic_filter, node_id, items) |
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278 return d |
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279 |
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280 def _magic_filter(self, subscribers, node_id, items): |
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281 list = {} |
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282 for subscriber in subscribers: |
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283 list[subscriber] = items |
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284 return list |
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285 |
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286 def register_notifier(self, observerfn, *args, **kwargs): |
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287 self.parent.addObserver('//event/pubsub/notify', observerfn, |
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288 *args, **kwargs) |
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289 |
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290 class SubscriptionService(service.Service): |
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291 |
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292 __implements__ = ISubscriptionService, |
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293 |
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294 def subscribe(self, node_id, subscriber, requestor): |
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295 if subscriber.userhostJID() != requestor: |
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296 raise NotAuthorized |
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297 |
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298 d1 = self.parent.storage.get_node_configuration(node_id) |
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299 d2 = self.parent.storage.get_affiliation(node_id, subscriber) |
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300 d = defer.DeferredList([d1, d2], fireOnOneErrback=1, consumeErrors=1) |
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301 d.addErrback(lambda x: x.value[0]) |
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302 d.addCallback(self._do_subscribe, node_id, subscriber) |
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303 return d |
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304 |
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305 def _do_subscribe(self, result, node_id, subscriber): |
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306 configuration = result[0][1] |
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307 affiliation = result[1][1] |
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308 |
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309 if affiliation == 'outcast': |
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310 raise NotAuthorized |
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311 |
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312 d = self.parent.storage.add_subscription(node_id, subscriber, |
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313 'subscribed') |
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314 d.addCallback(self._return_subscription, affiliation) |
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315 return d |
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316 |
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317 def _return_subscription(self, result, affiliation): |
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318 result['affiliation'] = affiliation |
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319 return result |
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320 |
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321 def unsubscribe(self, node_id, subscriber, requestor): |
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322 if subscriber.userhostJID() != requestor: |
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323 raise NotAuthorized |
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324 |
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325 d = self.parent.storage.get_node_configuration(node_id) |
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326 d.addCallback(self._do_unsubscribe, node_id, subscriber) |
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327 return d |
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328 |
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329 def _do_unsubscribe(self, result, node_id, subscriber): |
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330 return self.parent.storage.remove_subscription(node_id, |
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331 subscriber) |
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332 |
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333 class NodeCreationService(service.Service): |
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334 |
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335 __implements__ = INodeCreationService, |
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336 |
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337 def supports_instant_nodes(self): |
84 | 338 return True |
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339 |
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340 def create_node(self, node_id, requestor): |
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341 if not node_id: |
84 | 342 node_id = 'generic/%s' % sha.new(str(time.time()) + |
343 requestor.full()).hexdigest() | |
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344 |
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345 d = self.parent.storage.create_node(node_id, requestor) |
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346 d.addCallback(lambda _: node_id) |
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347 return d |
61 | 348 |
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349 def get_node_configuration(self, node_id): |
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350 if node_id: |
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351 d = self.parent.storage.get_node_configuration(node_id) |
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352 else: |
101
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353 # XXX: this is disabled in pubsub.py |
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354 d = defer.succeed(self.parent.default_config) |
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355 |
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356 d.addCallback(self._make_config) |
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357 return d |
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358 |
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359 def _make_config(self, config): |
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360 options = [] |
101
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361 for key, value in self.parent.options.iteritems(): |
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362 option = {"var": key} |
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363 option.update(value) |
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364 if config.has_key(key): |
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365 option["value"] = config[key] |
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366 options.append(option) |
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367 |
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368 return options |
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369 |
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370 def set_node_configuration(self, node_id, options, requestor): |
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371 for key in options.iterkeys(): |
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372 if not self.parent.options.has_key(key): |
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373 raise InvalidConfigurationOption |
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374 |
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375 d = self.parent.storage.get_affiliation(node_id, requestor) |
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376 d.addCallback(self._do_set_node_configuration, node_id, options) |
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377 return d |
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378 |
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379 def _do_set_node_configuration(self, affiliation, node_id, options): |
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380 if affiliation != 'owner': |
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381 raise NotAuthorized |
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382 |
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383 return self.parent.storage.set_node_configuration(node_id, options) |
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384 |
61 | 385 class AffiliationsService(service.Service): |
386 | |
387 __implements__ = IAffiliationsService, | |
388 | |
389 def get_affiliations(self, entity): | |
390 d1 = self.parent.storage.get_affiliations(entity) | |
391 d2 = self.parent.storage.get_subscriptions(entity) | |
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392 d = defer.DeferredList([d1, d2], fireOnOneErrback=1, consumeErrors=1) |
61 | 393 d.addErrback(lambda x: x.value[0]) |
394 d.addCallback(self._affiliations_result, entity) | |
395 return d | |
396 | |
397 def _affiliations_result(self, result, entity): | |
398 affiliations = result[0][1] | |
399 subscriptions = result[1][1] | |
400 | |
401 new_affiliations = {} | |
402 | |
403 for node, affiliation in affiliations: | |
404 new_affiliations[(node, entity.full())] = {'node': node, | |
405 'jid': entity, | |
406 'affiliation': affiliation, | |
407 'subscription': None | |
408 } | |
409 | |
410 for node, subscriber, subscription in subscriptions: | |
411 key = node, subscriber.full() | |
412 if new_affiliations.has_key(key): | |
413 new_affiliations[key]['subscription'] = subscription | |
414 else: | |
415 new_affiliations[key] = {'node': node, | |
416 'jid': subscriber, | |
417 'affiliation': None, | |
418 'subscription': subscription} | |
419 | |
420 return new_affiliations.values() | |
80
ec354aab3949
Implemented ItemRetrievalService.
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parents:
72
diff
changeset
|
421 |
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|
422 class ItemRetrievalService(service.Service): |
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72
diff
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|
423 |
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|
424 __implements__ = IItemRetrievalService |
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72
diff
changeset
|
425 |
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|
426 def get_items(self, node_id, requestor, max_items=None, item_ids=[]): |
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|
427 d = self.parent.storage.is_subscribed(node_id, requestor) |
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|
428 d.addCallback(self._do_get_items, node_id, max_items, item_ids) |
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Implemented ItemRetrievalService.
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72
diff
changeset
|
429 return d |
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72
diff
changeset
|
430 |
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diff
changeset
|
431 def _do_get_items(self, result, node_id, max_items, item_ids): |
ec354aab3949
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72
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|
432 if not result: |
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|
433 raise NotAuthorized |
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72
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changeset
|
434 |
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|
435 if item_ids: |
98 | 436 return self.parent.storage.get_items_by_ids(node_id, item_ids) |
80
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Ralph Meijer <ralphm@ik.nu>
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diff
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|
437 else: |
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|
438 return self.parent.storage.get_items(node_id, max_items) |
85
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Implement node retraction, with storage support for pgsql.
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|
439 |
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|
440 class RetractionService(service.Service): |
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441 |
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|
442 __implements__ = IRetractionService, |
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|
443 |
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444 def retract_item(self, node_id, item_ids, requestor): |
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445 d1 = self.parent.storage.get_node_configuration(node_id) |
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446 d2 = self.parent.storage.get_affiliation(node_id, requestor) |
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447 d = defer.DeferredList([d1, d2], fireOnOneErrback=1) |
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448 d.addErrback(lambda x: x.value[0]) |
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449 d.addCallback(self._do_retract, node_id, item_ids) |
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Implement node retraction, with storage support for pgsql.
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450 return d |
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Implement node retraction, with storage support for pgsql.
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|
451 |
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452 def _do_retract(self, result, node_id, item_ids): |
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453 configuration = result[0][1] |
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454 persist_items = configuration["persist_items"] |
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|
455 affiliation = result[1][1] |
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Implement node retraction, with storage support for pgsql.
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|
456 |
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|
457 if affiliation not in ['owner', 'publisher']: |
ec557449d1aa
Implement node retraction, with storage support for pgsql.
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|
458 raise NotAuthorized |
ec557449d1aa
Implement node retraction, with storage support for pgsql.
Ralph Meijer <ralphm@ik.nu>
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84
diff
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|
459 |
ec557449d1aa
Implement node retraction, with storage support for pgsql.
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|
460 if not persist_items: |
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|
461 raise NodeNotPersistent |
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|
462 |
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|
463 d = self.parent.storage.remove_items(node_id, item_ids) |
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464 d.addCallback(self._do_notify_retraction, node_id) |
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465 return d |
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Implement node retraction, with storage support for pgsql.
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|
466 |
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467 def _do_notify_retraction(self, result, node_id): |
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468 self.parent.dispatch({ 'item_ids': result, 'node_id': node_id }, |
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|
469 '//event/pubsub/retract') |
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|
470 |
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|
471 def purge_node(self, node_id, requestor): |
90
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472 d1 = self.parent.storage.get_node_configuration(node_id) |
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473 d2 = self.parent.storage.get_affiliation(node_id, requestor) |
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474 d = defer.DeferredList([d1, d2], fireOnOneErrback=1) |
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475 d.addErrback(lambda x: x.value[0]) |
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476 d.addCallback(self._do_purge, node_id) |
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|
477 return d |
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|
478 |
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|
479 def _do_purge(self, result, node_id): |
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|
480 configuration = result[0][1] |
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|
481 persist_items = configuration["persist_items"] |
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|
482 affiliation = result[1][1] |
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changeset
|
483 |
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|
484 if affiliation != 'owner': |
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85
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|
485 raise NotAuthorized |
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diff
changeset
|
486 |
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changeset
|
487 if not persist_items: |
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changeset
|
488 raise NodeNotPersistent |
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85
diff
changeset
|
489 |
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|
490 d = self.parent.storage.purge_node(node_id) |
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|
491 d.addCallback(self._do_notify_purge, node_id) |
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Implement node purging and node deletion.
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85
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changeset
|
492 return d |
59378610b16e
Implement node purging and node deletion.
Ralph Meijer <ralphm@ik.nu>
parents:
85
diff
changeset
|
493 |
59378610b16e
Implement node purging and node deletion.
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|
494 def _do_notify_purge(self, result, node_id): |
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|
495 self.parent.dispatch(node_id, '//event/pubsub/purge') |
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Implement node purging and node deletion.
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changeset
|
496 |
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|
497 class NodeDeletionService(service.Service): |
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diff
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|
498 |
59378610b16e
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|
499 __implements__ = INodeDeletionService, |
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parents:
85
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changeset
|
500 |
59378610b16e
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85
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|
501 def __init__(self): |
59378610b16e
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|
502 self._callback_list = [] |
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85
diff
changeset
|
503 |
59378610b16e
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|
504 def register_pre_delete(self, pre_delete_fn): |
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|
505 self._callback_list.append(pre_delete_fn) |
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changeset
|
506 |
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|
507 def get_subscribers(self, node_id): |
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|
508 return self.parent.storage.get_subscribers(node_id) |
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changeset
|
509 |
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|
510 def delete_node(self, node_id, requestor): |
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|
511 d1 = self.parent.storage.get_node_configuration(node_id) |
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|
512 d2 = self.parent.storage.get_affiliation(node_id, requestor) |
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|
513 d = defer.DeferredList([d1, d2], fireOnOneErrback=1) |
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|
514 d.addErrback(lambda x: x.value[0]) |
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|
515 d.addCallback(self._do_pre_delete, node_id) |
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|
516 return d |
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|
517 |
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|
518 def _do_pre_delete(self, result, node_id): |
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|
519 configuration = result[0][1] |
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|
520 persist_items = configuration["persist_items"] |
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diff
changeset
|
521 affiliation = result[1][1] |
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parents:
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diff
changeset
|
522 |
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|
523 if affiliation != 'owner': |
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changeset
|
524 raise NotAuthorized |
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85
diff
changeset
|
525 |
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|
526 d = defer.DeferredList([cb(node_id) for cb in self._callback_list], |
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|
527 consumeErrors=1) |
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|
528 d.addCallback(self._do_delete, node_id) |
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diff
changeset
|
529 |
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|
530 def _do_delete(self, result, node_id): |
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changeset
|
531 dl = [] |
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|
532 for succeeded, r in result: |
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|
533 if succeeded and r: |
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|
534 dl.extend(r) |
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85
diff
changeset
|
535 |
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|
536 d = self.parent.storage.delete_node(node_id) |
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|
537 d.addCallback(self._do_notify_delete, dl) |
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diff
changeset
|
538 |
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|
539 return d |
59378610b16e
Implement node purging and node deletion.
Ralph Meijer <ralphm@ik.nu>
parents:
85
diff
changeset
|
540 |
59378610b16e
Implement node purging and node deletion.
Ralph Meijer <ralphm@ik.nu>
parents:
85
diff
changeset
|
541 def _do_notify_delete(self, result, dl): |
59378610b16e
Implement node purging and node deletion.
Ralph Meijer <ralphm@ik.nu>
parents:
85
diff
changeset
|
542 for d in dl: |
59378610b16e
Implement node purging and node deletion.
Ralph Meijer <ralphm@ik.nu>
parents:
85
diff
changeset
|
543 d.callback(None) |