Mercurial > libervia-pubsub

annotate idavoll/backend.py @ 162:84cfe9fe38c5

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Comply with the access model 'open'. Currently, the only implemented access model is 'open', so we should not check for the subscription of the requestor for item retrieval. We do reject outcasts.
author Ralph Meijer <ralphm@ik.nu>
date Wed, 06 Sep 2006 12:57:53 +0000
parents 6fe78048baf9
children ef22e4150caa
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # Copyright (c) 2003-2006 Ralph Meijer
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2 # See LICENSE for details.
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3
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4 from zope.interface import Interface
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5 import storage
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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 Forbidden(Error):
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14 pass
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15
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16 class ItemForbidden(Error):
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17 pass
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18
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19 class ItemRequired(Error):
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20 pass
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22 class NoInstantNodes(Error):
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23 pass
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25 class NotSubscribed(Error):
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26 pass
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28 class InvalidConfigurationOption(Error):
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29 msg = 'Invalid configuration option'
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30
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31 class InvalidConfigurationValue(Error):
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32 msg = 'Bad configuration value'
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34 class NodeNotPersistent(Error):
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35 pass
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36
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37 class NoRootNode(Error):
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38 pass
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39
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40 class IBackendService(Interface):
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41 """ Interface to a backend service of a pubsub service. """
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42
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43 def __init__(storage):
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44 """
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45 @param storage: L{storage} object.
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46 """
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47
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48 def supports_publisher_affiliation(self):
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49 """ Reports if the backend supports the publisher affiliation.
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50
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51 @rtype: C{bool}
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52 """
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53
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54 def supports_outcast_affiliation(self):
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55 """ Reports if the backend supports the publisher affiliation.
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56
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57 @rtype: C{bool}
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58 """
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59
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60 def supports_persistent_items(self):
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61 """ Reports if the backend supports persistent items.
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108
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63 @rtype: C{bool}
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64 """
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65
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66 def get_node_type(node_id):
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67 """ Return type of a node.
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68
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69 @return: a deferred that returns either 'leaf' or 'collection'
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70 """
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71
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72 def get_nodes(self):
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73 """ Returns list of all nodes.
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74
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75 @return: a deferred that returns a C{list} of node ids.
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76 """
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77
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78 def get_node_meta_data(node_id):
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79 """ Return meta data for a node.
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80
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81 @return: a deferred that returns a C{list} of C{dict}s with the
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82 metadata.
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83 """
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84
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85 class INodeCreationService(Interface):
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86 """ A service for creating nodes """
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87
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88 def create_node(node_id, requestor):
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89 """ Create a node.
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90
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91 @return: a deferred that fires when the node has been created.
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92 """
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93
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94 class INodeDeletionService(Interface):
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95 """ A service for deleting nodes. """
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96
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97 def register_pre_delete(pre_delete_fn):
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98 """ Register a callback that is called just before a node deletion.
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99
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100 The function C{pre_deleted_fn} is added to a list of functions
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101 to be called just before deletion of a node. The callback
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102 C{pre_delete_fn} is called with the C{node_id} that is about to be
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103 deleted and should return a deferred that returns a list of deferreds
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104 that are to be fired after deletion. The backend collects the lists
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105 from all these callbacks before actually deleting the node in question.
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106 After deletion all collected deferreds are fired to do post-processing.
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107
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108 The idea is that you want to be able to collect data from the
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109 node before deleting it, for example to get a list of subscribers
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110 that have to be notified after the node has been deleted. To do this,
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111 C{pre_delete_fn} fetches the subscriber list and passes this
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112 list to a callback attached to a deferred that it sets up. This
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113 deferred is returned in the list of deferreds.
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114 """
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115
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116 def get_subscribers(node_id):
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117 """ Get node subscriber list.
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118
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119 @return: a deferred that fires with the list of subscribers.
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120 """
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121
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122 def delete_node(node_id, requestor):
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123 """ Delete a node.
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124
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125 @return: a deferred that fires when the node has been deleted.
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126 """
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127
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128 class IPublishService(Interface):
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129 """ A service for publishing items to a node. """
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130
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131 def publish(node_id, items, requestor):
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132 """ Publish items to a pubsub node.
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133
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134 @return: a deferred that fires when the items have been published.
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135 """
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136 class INotificationService(Interface):
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137 """ A service for notification of published items. """
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138
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139 def register_notifier(observerfn, *args, **kwargs):
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140 """ Register callback which is called for notification. """
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141
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142 def get_notification_list(node_id, items):
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143 pass
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144
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145 class ISubscriptionService(Interface):
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146 """ A service for managing subscriptions. """
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147
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148 def subscribe(node_id, subscriber, requestor):
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149 """ Request the subscription of an entity to a pubsub node.
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150
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151 Depending on the node's configuration and possible business rules, the
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152 C{subscriber} is added to the list of subscriptions of the node with id
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153 C{node_id}. The C{subscriber} might be different from the C{requestor},
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154 and if the C{requestor} is not allowed to subscribe this entity an
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155 exception should be raised.
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156
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157 @return: a deferred that returns the subscription state
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158 """
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159
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160 def unsubscribe(node_id, subscriber, requestor):
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161 """ Cancel the subscription of an entity to a pubsub node.
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162
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163 The subscription of C{subscriber} is removed from the list of
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164 subscriptions of the node with id C{node_id}. If the C{requestor}
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165 is not allowed to unsubscribe C{subscriber}, an an exception should
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166 be raised.
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167
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168 @return: a deferred that fires when unsubscription is complete.
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169 """
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170
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171 def get_subscriptions(entity):
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172 """ Report the list of current subscriptions with this pubsub service.
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173
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174 Report the list of the current subscriptions with all nodes within this
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175 pubsub service, for the C{entity}.
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176
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177 @return: a deferred that returns the list of all current subscriptions
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178 as tuples C{(node_id, subscriber, subscription)}.
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179 """
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180
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181 class IAffiliationsService(Interface):
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182 """ A service for retrieving the affiliations with this pubsub service. """
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183
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184 def get_affiliations(entity):
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185 """ Report the list of current affiliations with this pubsub service.
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186
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187 Report the list of the current affiliations with all nodes within this
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188 pubsub service, for the C{entity}.
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189
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190 @return: a deferred that returns the list of all current affiliations
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191 as tuples C{(node_id, affiliation)}.
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192 """
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193
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194 class IRetractionService(Interface):
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195 """ A service for retracting published items """
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196
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197 def retract_item(node_id, item_id, requestor):
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198 """ Removes item in node from persistent storage """
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199
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200 def purge_node(node_id, requestor):
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201 """ Removes all items in node from persistent storage """
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202
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203 class IItemRetrievalService(Interface):
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204 """ A service for retrieving previously published items. """
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205
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206 def get_items(node_id, requestor, max_items=None, item_ids=[]):
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207 """ Retrieve items from persistent storage
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208
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209 If C{max_items} is given, return the C{max_items} last published
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210 items, else if C{item_ids} is not empty, return the items requested.
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211 If neither is given, return all items.
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212
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213 @return: a deferred that returns the requested items
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214 """