Mercurial > moin > 1.9

annotate MoinMoin/events/__init__.py @ 2396:cf85b6916d17

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Add a PagePreSave event; abort page save if handlers return Abort.
author Karol 'grzywacz' Nowak <grzywacz@sul.uni.lodz.pl>
date Sun, 15 Jul 2007 23:40:40 +0200
parents 53fbdf5899ff
children 245181ec9fe2
rev   line source
2058
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1 # -*- coding: iso-8859-1 -*-
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2 """
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3 MoinMoin - event (notification) framework
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4
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5 This code abstracts event handling in MoinMoin,
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6 currently for notifications. It implements the observer pattern.
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7
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8 @copyright: 2007 by Karol Nowak <grywacz@gmail.com>
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9 @license: GNU GPL, see COPYING for details.
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10 """
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11
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12 import logging
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13
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14 from MoinMoin import wikiutil
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15 from MoinMoin.util import pysupport
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16 from MoinMoin.wikiutil import PluginAttributeError
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18 # Create a list of extension actions from the package directory
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19 modules = pysupport.getPackageModules(__file__)
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20
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21 # A module-wide Logger, don't use it from outside
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22 logger = logging.getLogger("events")
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23 logger.setLevel(logging.DEBUG)
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24 logger.addHandler(logging.StreamHandler())
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27 class Event(object):
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28 """A class handling information common to all events."""
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29 def __init__(self, request):
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30 self.request = request
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32
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33 class PageEvent(Event):
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34 """An event related to a page change"""
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35 def __init__(self, request):
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36 Event.__init__(self, request)
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38
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39 class PageChangedEvent(PageEvent):
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40
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41 description = u"""Page has been modified (edit, creation, deletion)"""
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42 req_superuser = False
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43
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44 def __init__(self, request, page, comment, trivial):
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45 PageEvent.__init__(self, request)
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46 self.page = page
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47 self.comment = comment
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48 self.trivial = trivial
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51 class PageRenamedEvent(PageEvent):
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52
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53 description = u"""Page has been renamed"""
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54 req_superuser = False
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55
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56 def __init__(self, request, page, old_page, comment):
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57 PageEvent.__init__(self, request)
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58 self.page = page
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59 self.old_page = old_page
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60 self.comment = comment
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62
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63 class PageDeletedEvent(PageEvent):
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65 description = u"""Page has been deleted"""
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66 req_superuser = False
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68 def __init__(self, request, page, comment):
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69 PageEvent.__init__(self, request)
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70 self.page = page
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71 self.comment = comment
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74 class PageCopiedEvent(PageEvent):
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76 description = u"""Page has been copied"""
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77 req_superuser = False
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78
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79 def __init__(self, request, page, old_page, comment):
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80 PageEvent.__init__(self, request)
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81 self.page = page
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82 self.old_page = old_page
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83 self.comment = comment
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84
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86 class FileAttachedEvent(PageEvent):
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88 description = u"""A new attachment has been added"""
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89 req_superuser = False
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90
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91 def __init__(self, request, pagename, name, size):
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92 PageEvent.__init__(self, request)
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93 self.request = request
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94 self.pagename = pagename
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95 self.name = name
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96 self.size = size
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99 class PageRevertedEvent(PageEvent):
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101 description = u"""A page has been reverted to a previous state"""
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102 req_superuser = False
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104 def __init__(self, request, pagename, previous, current):
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105 PageEvent.__init__(self, request)
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106 self.pagename = pagename
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107 self.previous = previous
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108 self.current = current
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110
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111 class SubscribedToPageEvent(PageEvent):
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112
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113 description = u"""An user has subscribed to a page"""
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114 req_superuser = True
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115
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116 def __init__(self, request, pagename, username):
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117 PageEvent.__init__(self, request)
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118 self.pagename = pagename
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119 self.username = username
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120
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121
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122 class JabberIDSetEvent(Event):
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123 """ Sent when user changes her Jabber ID """
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124
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125 def __init__(self, request, jid):
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126 Event.__init__(self, request)
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127 self.jid = jid
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128
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129 class JabberIDUnsetEvent(Event):
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130 """ Sent when Jabber ID is no longer used
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131
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132 Obviously this will be usually sent along with JabberIDSetEvent,
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133 because we require user's jabber id to be unique by default.
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134
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135 """
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136 def __init__(self, request, jid):
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137 Event.__init__(self, request)
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138 self.jid = jid
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139
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140 class UserCreatedEvent(Event):
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141 """ Sent when a new user has been created """
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142
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143 description = u"""A new account has been created"""
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144 req_superuser = True
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145
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146 def __init__(self, request, user):
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147 Event.__init__(self, request)
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148 self.user = user
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149
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150 class PagePreSaveEvent(Event):
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151 """ Event sent when a page is about to be saved
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152
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153 This can be used to abort a save, for instance,
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154 if handler returns
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155
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156 """
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157 def __init__(self, request, page_editor, new_text):
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158 Event.__init__(self, request)
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159 self.page_editor = page_editor
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160 self.new_text = new_text
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161
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162
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163 class EventResult:
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164 """ This is a base class for messages passed from event handlers """
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165 pass
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166
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167 class Abort(EventResult):
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168 """ Result returned if handler wants to abort operation that sent the event """
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169 def __init__(self, reason):
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170 """
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171 @param reason: human-readable reason of failure
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172 """
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173 self.reason = reason
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174
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175
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176 def get_handlers(cfg):
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177 """Create a list of available event handlers.
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178
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179 Each handler is a handle() function defined in an plugin,
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180 pretty much like in case of actions.
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181
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182 TODO: maybe make it less dumb? ;-)
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183
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184 """
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185 event_handlers = []
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186 names = wikiutil.getPlugins("events", cfg)
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187
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188 for name in names:
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189 try:
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190 handler = wikiutil.importPlugin(cfg, "events", name, "handle")
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191 except PluginAttributeError:
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192 handler = None
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193
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194 if handler is not None:
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195 event_handlers.append(handler)
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196
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197 return event_handlers
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198
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199
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200 def send_event(event):
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201 """Function called from outside to process an event
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202
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203 @return: a list of messages returned by handlers
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204 @rtype: list
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205 """
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206
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207 # A list of messages generated by event handlers, passed back to caller
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208 msg = []
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209 cfg = event.request.cfg
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210
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211 # Try to handle the event with each available handler (for now)
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212 for handle in cfg.event_handlers:
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213 retval = handle(event)
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214
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215 assert retval is None or isinstance(retval, EventResult)
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216
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217 if retval:
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218 msg.append(retval)
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219
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220 return msg
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221
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222 def get_subscribable_events():
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223 """Create and return a list of user-visible events
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224
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225 @return: A list of user-visible events described by dictionaries
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226 @rtype: dict
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227 """
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228 defs = globals()
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229 subscribable_events = {}
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230
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231 for ev in defs.values():
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232 if type(ev) is type and issubclass(ev, Event) and ev.__dict__.has_key("description"):
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233 subscribable_events[ev.__name__] = {'desc': ev.description,
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234 'superuser': ev.req_superuser}
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235 return subscribable_events