Mercurial > libervia-pubsub

annotate idavoll/backend.py @ 80:ec354aab3949

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Implemented ItemRetrievalService.
author Ralph Meijer <ralphm@ik.nu>
date Tue, 09 Nov 2004 14:51:32 +0000
parents a914cad421c5
children 34be83a0bd2e
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49
94e4ede2a357 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
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6
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7 class Error(Exception):
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8 msg = ''
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9
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10 def __str__(self):
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11 return self.msg
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12
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13 class NodeNotFound(Error):
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14 msg = 'Node not found'
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16 class NotAuthorized(Error):
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17 pass
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eddea65d1032 Added two exceptions: NoInstantNodes and NodeExists.
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18
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19 class PayloadExpected(Error):
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20 msg = 'Payload expected'
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21
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22 class NoPayloadAllowed(Error):
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23 msg = 'No payload allowed'
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24
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25 class NoInstantNodes(Error):
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26 pass
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884268687229 Simplify call chain by mapping incoming requests directly to method
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28 class NodeExists(Error):
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29 pass
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31 class NotImplemented(Error):
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32 pass
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34 class NotSubscribed(Error):
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35 pass
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36
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37 class IBackendService(components.Interface):
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38 """ Interface to a backend service of a pubsub service. """
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39
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40 def get_supported_affiliations(self):
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41 """ Reports the list of supported affiliation types.
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42
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43 @return: a list of supported affiliation types.
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44 """
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45
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46 class INodeCreationService(components.Interface):
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47 """ A service for creating nodes """
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48
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49 def create_node(self, node_id, requestor):
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50 """ Create a node.
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51
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52 @return: a deferred that fires when the node has been created.
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53 """
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54
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55 class IPublishService(components.Interface):
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56 """ A service for publishing items to a node. """
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57
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58 def publish(self, node_id, items, requestor):
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59 """ Publish items to a pubsub node.
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60
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61 @return: a deferred that fires when the items have been published.
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62 """
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63 class INotificationService(components.Interface):
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64 """ A service for notification of published items. """
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65
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66 def register_notifier(self, observerfn, *args, **kwargs):
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67 """ Register callback which is called for notification. """
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68
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69 def get_notification_list(self, node_id, items):
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70 pass
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71
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72 class ISubscriptionService(components.Interface):
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73 """ A service for managing subscriptions. """
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74
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75 def subscribe(self, node_id, subscriber, requestor):
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76 """ Request the subscription of an entity to a pubsub node.
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77
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78 Depending on the node's configuration and possible business rules, the
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79 C{subscriber} is added to the list of subscriptions of the node with id
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80 C{node_id}. The C{subscriber} might be different from the C{requestor},
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81 and if the C{requestor} is not allowed to subscribe this entity an
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82 exception should be raised.
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83
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84 @return: a deferred that returns the subscription state
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85 """
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86
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87 def unsubscribe(self, node_id, subscriber, requestor):
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88 """ Cancel the subscription of an entity to a pubsub node.
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89
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90 The subscription of C{subscriber} is removed from the list of
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91 subscriptions of the node with id C{node_id}. If the C{requestor}
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92 is not allowed to unsubscribe C{subscriber}, an an exception should
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93 be raised.
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94
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95 @return: a deferred that fires when unsubscription is complete.
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96 """
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97
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98 class IAffiliationsService(components.Interface):
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99 """ A service for retrieving the affiliations with this pubsub service. """
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100
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101 def get_affiliations(self, entity):
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102 """ Report the list of current affiliations with this pubsub service.
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103
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104 Report the list of the current affiliations with all nodes within this
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105 pubsub service, along with subscriptions to such nodes, for the
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106 C{entity}.
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107
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108 @return: a deferred that returns the list of all current affiliations
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109 and subscriptions.
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110 """
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111
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112 class IRetractionService(components.Interface):
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113 """ A service for retracting published items """
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114
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115 def retract_item(self, node_id, item_id, requestor):
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116 """ Removes item in node from persistent storage """
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117
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118 def purge_node(self, node_id, requestor):
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119 """ Removes all items in node from persistent storage """
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120
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121 class IItemRetrievalService(components.Interface):
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122 """ A service for retrieving previously published items. """
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123
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124 def get_items(self, node_id, requestor, max_items=None, item_ids=[]):
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125 """ Retrieve items from persistent storage
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126
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127 If C{max_items} is given, return the C{max_items} last published
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128 items, else if C{item_ids} is not empty, return the items requested.
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129 If neither is given, return all items.
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130
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131 @return: a deferred that returns the requested items
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132 """
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133
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134 class BackendService(service.MultiService, utility.EventDispatcher):
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135
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136 __implements__ = IBackendService,
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137
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138 def __init__(self, storage):
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139 service.MultiService.__init__(self)
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140 utility.EventDispatcher.__init__(self)
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141 self.storage = storage
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142
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143 def supports_publisher_affiliation(self):
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144 return True
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145
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146 def supports_outcast_affiliation(self):
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147 return True
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148
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149 def supports_persistent_items(self):
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150 return True
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151
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152 def get_node_type(self, node_id):
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153 return self.storage.get_node_type(node_id)
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154
a914cad421c5 Added get_nodes() to BackendService.
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155 def get_nodes(self):
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156 return self.storage.get_nodes()
65
d617f8d19263 Add get_node_type() to BackendService.
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157
44
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158 class PublishService(service.Service):
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159
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160 __implements__ = IPublishService,
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diff changeset
161
43
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162 def publish(self, node_id, items, requestor):
44
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163 d1 = self.parent.storage.get_node_configuration(node_id)
59
0fa161c00ed9 Use jid.JIDs everywhere in the backend.
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164 d2 = self.parent.storage.get_affiliation(node_id, requestor)
43
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165 d = defer.DeferredList([d1, d2], fireOnOneErrback=1)
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diff changeset
166 d.addErrback(lambda x: x.value[0])
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167 d.addCallback(self._do_publish, node_id, items, requestor)
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168 return d
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169
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170 def _do_publish(self, result, node_id, items, requestor):
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171 configuration = result[0][1]
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172 persist_items = configuration["persist_items"]
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173 deliver_payloads = configuration["deliver_payloads"]
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174 affiliation = result[1][1]
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175
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176 if affiliation not in ['owner', 'publisher']:
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177 raise NotAuthorized
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178
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179 if items and not persist_items and not deliver_payloads:
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180 raise NoPayloadAllowed
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181 elif not items and (persist_items or deliver_payloads):
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182 raise PayloadExpected
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183
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184 print "publish by %s to %s" % (requestor.full(), node_id)
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185
9685b7e291ef Moved common stuff out of pgsql_backend.py to backend.py.
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186 if persist_items or deliver_payloads:
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187 for item in items:
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188 if item["id"] is None:
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189 item["id"] = 'random' # FIXME
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190
9685b7e291ef Moved common stuff out of pgsql_backend.py to backend.py.
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191 if persist_items:
44
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192 d = self.parent.storage.store_items(node_id, items,
59
0fa161c00ed9 Use jid.JIDs everywhere in the backend.
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diff changeset
193 requestor)
43
9685b7e291ef Moved common stuff out of pgsql_backend.py to backend.py.
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diff changeset
194 else:
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195 d = defer.succeed(None)
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diff changeset
196
9685b7e291ef Moved common stuff out of pgsql_backend.py to backend.py.
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diff changeset
197 d.addCallback(self._do_notify, node_id, items, deliver_payloads)
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198
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199 def _do_notify(self, result, node_id, items, deliver_payloads):
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diff changeset
200 if items and not deliver_payloads:
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diff changeset
201 for item in items:
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diff changeset
202 item.children = []
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203
44
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diff changeset
204 self.parent.dispatch({ 'items': items, 'node_id': node_id },
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205 '//event/pubsub/notify')
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206
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207 class NotificationService(service.Service):
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208
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209 __implements__ = INotificationService,
43
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210
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211 def get_notification_list(self, node_id, items):
44
bc7438476a67 Removed IPersistenceService, this is a feature of the storage facility.
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212 d = self.parent.storage.get_subscribers(node_id)
43
9685b7e291ef Moved common stuff out of pgsql_backend.py to backend.py.
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diff changeset
213 d.addCallback(self._magic_filter, node_id, items)
9685b7e291ef Moved common stuff out of pgsql_backend.py to backend.py.
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diff changeset
214 return d
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215
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216 def _magic_filter(self, subscribers, node_id, items):
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217 list = {}
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218 for subscriber in subscribers:
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219 list[subscriber] = items
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220 return list
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diff changeset
221
29
d4fc29bb5381 Define interfaces of blocks of functionality.
Ralph Meijer <ralphm@ik.nu>
parents: 24
diff changeset
222 def register_notifier(self, observerfn, *args, **kwargs):
d4fc29bb5381 Define interfaces of blocks of functionality.
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diff changeset
223 self.parent.addObserver('//event/pubsub/notify', observerfn,
d4fc29bb5381 Define interfaces of blocks of functionality.
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diff changeset
224 *args, **kwargs)
49
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
225
94e4ede2a357 Implement SubscriptionService with separate storage.
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226 class SubscriptionService(service.Service):
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227
94e4ede2a357 Implement SubscriptionService with separate storage.
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228 __implements__ = ISubscriptionService,
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229
94e4ede2a357 Implement SubscriptionService with separate storage.
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230 def subscribe(self, node_id, subscriber, requestor):
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
231 if subscriber.userhostJID() != requestor:
94e4ede2a357 Implement SubscriptionService with separate storage.
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232 raise NotAuthorized
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
233
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
234 d1 = self.parent.storage.get_node_configuration(node_id)
59
0fa161c00ed9 Use jid.JIDs everywhere in the backend.
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diff changeset
235 d2 = self.parent.storage.get_affiliation(node_id, subscriber)
49
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
236 d = defer.DeferredList([d1, d2], fireOnOneErrback=1)
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
237 d.addErrback(lambda x: x.value[0])
94e4ede2a357 Implement SubscriptionService with separate storage.
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238 d.addCallback(self._do_subscribe, node_id, subscriber)
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
239 return d
94e4ede2a357 Implement SubscriptionService with separate storage.
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240
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
241 def _do_subscribe(self, result, node_id, subscriber):
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
242 configuration = result[0][1]
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
243 affiliation = result[1][1]
94e4ede2a357 Implement SubscriptionService with separate storage.
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244
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
245 if affiliation == 'outcast':
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
246 raise NotAuthorized
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
247
59
0fa161c00ed9 Use jid.JIDs everywhere in the backend.
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diff changeset
248 d = self.parent.storage.add_subscription(node_id, subscriber,
49
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
249 'subscribed')
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
250 d.addCallback(self._return_subscription, affiliation)
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
251 return d
94e4ede2a357 Implement SubscriptionService with separate storage.
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252
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
253 def _return_subscription(self, result, affiliation):
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
254 result['affiliation'] = affiliation
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
255 return result
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
256
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
257 def unsubscribe(self, node_id, subscriber, requestor):
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
258 if subscriber.userhostJID() != requestor:
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
259 raise NotAuthorized
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
260
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
261 d = self.parent.storage.get_node_configuration(node_id)
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
262 d.addCallback(self._do_unsubscribe, node_id, subscriber)
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
263 return d
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
264
94e4ede2a357 Implement SubscriptionService with separate storage.
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diff changeset
265 def _do_unsubscribe(self, result, node_id, subscriber):
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diff changeset
266 return self.parent.storage.remove_subscription(node_id,
59
0fa161c00ed9 Use jid.JIDs everywhere in the backend.
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diff changeset
267 subscriber)
53
e602ddda2d6e Implement NodeCreationService, using the create_node() method of Storage.
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diff changeset
268
e602ddda2d6e Implement NodeCreationService, using the create_node() method of Storage.
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diff changeset
269 class NodeCreationService(service.Service):
e602ddda2d6e Implement NodeCreationService, using the create_node() method of Storage.
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diff changeset
270
e602ddda2d6e Implement NodeCreationService, using the create_node() method of Storage.
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diff changeset
271 __implements__ = INodeCreationService,
e602ddda2d6e Implement NodeCreationService, using the create_node() method of Storage.
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diff changeset
272
e602ddda2d6e Implement NodeCreationService, using the create_node() method of Storage.
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diff changeset
273 def supports_instant_nodes(self):
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diff changeset
274 return False
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diff changeset
275
e602ddda2d6e Implement NodeCreationService, using the create_node() method of Storage.
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diff changeset
276 def create_node(self, node_id, requestor):
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diff changeset
277 if not node_id:
e602ddda2d6e Implement NodeCreationService, using the create_node() method of Storage.
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diff changeset
278 raise NoInstantNodes
e602ddda2d6e Implement NodeCreationService, using the create_node() method of Storage.
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diff changeset
279
59
0fa161c00ed9 Use jid.JIDs everywhere in the backend.
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diff changeset
280 d = self.parent.storage.create_node(node_id, requestor)
53
e602ddda2d6e Implement NodeCreationService, using the create_node() method of Storage.
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diff changeset
281 d.addCallback(lambda _: node_id)
e602ddda2d6e Implement NodeCreationService, using the create_node() method of Storage.
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diff changeset
282 return d
61
ad08e021b4d5 Implement AffiliationsService.
Ralph Meijer <ralphm@ik.nu>
parents: 59
diff changeset
283
ad08e021b4d5 Implement AffiliationsService.
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diff changeset
284 class AffiliationsService(service.Service):
ad08e021b4d5 Implement AffiliationsService.
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diff changeset
285
ad08e021b4d5 Implement AffiliationsService.
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diff changeset
286 __implements__ = IAffiliationsService,
ad08e021b4d5 Implement AffiliationsService.
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diff changeset
287
ad08e021b4d5 Implement AffiliationsService.
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diff changeset
288 def get_affiliations(self, entity):
ad08e021b4d5 Implement AffiliationsService.
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diff changeset
289 d1 = self.parent.storage.get_affiliations(entity)
ad08e021b4d5 Implement AffiliationsService.
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diff changeset
290 d2 = self.parent.storage.get_subscriptions(entity)
ad08e021b4d5 Implement AffiliationsService.
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diff changeset
291 d = defer.DeferredList([d1, d2], fireOnOneErrback=1)
ad08e021b4d5 Implement AffiliationsService.
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parents: 59
diff changeset
292 d.addErrback(lambda x: x.value[0])
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293 d.addCallback(self._affiliations_result, entity)
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294 return d
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295
ad08e021b4d5 Implement AffiliationsService.
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296 def _affiliations_result(self, result, entity):
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297 affiliations = result[0][1]
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298 subscriptions = result[1][1]
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299
ad08e021b4d5 Implement AffiliationsService.
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300 new_affiliations = {}
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301
ad08e021b4d5 Implement AffiliationsService.
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302 for node, affiliation in affiliations:
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303 new_affiliations[(node, entity.full())] = {'node': node,
ad08e021b4d5 Implement AffiliationsService.
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304 'jid': entity,
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305 'affiliation': affiliation,
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306 'subscription': None
ad08e021b4d5 Implement AffiliationsService.
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307 }
ad08e021b4d5 Implement AffiliationsService.
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308
ad08e021b4d5 Implement AffiliationsService.
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309 for node, subscriber, subscription in subscriptions:
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310 key = node, subscriber.full()
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311 if new_affiliations.has_key(key):
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312 new_affiliations[key]['subscription'] = subscription
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313 else:
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314 new_affiliations[key] = {'node': node,
ad08e021b4d5 Implement AffiliationsService.
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315 'jid': subscriber,
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316 'affiliation': None,
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317 'subscription': subscription}
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318
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319 return new_affiliations.values()
80
ec354aab3949 Implemented ItemRetrievalService.
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320
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321 class ItemRetrievalService(service.Service):
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322
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323 __implements__ = IItemRetrievalService
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324
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325 def get_items(self, node_id, requestor, max_items=None, item_ids=[]):
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326 d = self.parent.storage.is_subscribed(node_id, requestor)
ec354aab3949 Implemented ItemRetrievalService.
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327 d.addCallback(self._do_get_items, node_id, max_items, item_ids)
ec354aab3949 Implemented ItemRetrievalService.
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328 return d
ec354aab3949 Implemented ItemRetrievalService.
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329
ec354aab3949 Implemented ItemRetrievalService.
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330 def _do_get_items(self, result, node_id, max_items, item_ids):
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331 def q(r):
ec354aab3949 Implemented ItemRetrievalService.
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332 print r
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333 return r
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334
ec354aab3949 Implemented ItemRetrievalService.
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335 if not result:
ec354aab3949 Implemented ItemRetrievalService.
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336 raise NotAuthorized
ec354aab3949 Implemented ItemRetrievalService.
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337
ec354aab3949 Implemented ItemRetrievalService.
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338 if item_ids:
ec354aab3949 Implemented ItemRetrievalService.
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339 d = self.parent.storage.get_items_by_ids(node_id, item_ids)
ec354aab3949 Implemented ItemRetrievalService.
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340 d.addCallback(q)
ec354aab3949 Implemented ItemRetrievalService.
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341 d.addErrback(q)
ec354aab3949 Implemented ItemRetrievalService.
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342 return d
ec354aab3949 Implemented ItemRetrievalService.
Ralph Meijer <ralphm@ik.nu>
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343 else:
ec354aab3949 Implemented ItemRetrievalService.
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344 return self.parent.storage.get_items(node_id, max_items)