annotate MoinMoin/events/__init__.py @ 2628:35690680ecac

Use event's "name" attribute instead of class name.
author Karol 'grzywacz' Nowak <grzywacz@sul.uni.lodz.pl>
date Tue, 24 Jul 2007 01:12:16 +0200
parents 5b8e8e7db56f
children f42fb1ae0a38
rev   line source
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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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17
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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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25
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26 # Dummy pseudo-getText function used in event descriptions,
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27 # so that they get into .po files
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28 _ = lambda x: x
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29
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30
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31 class Event(object):
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32 """A class handling information common to all events."""
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33 def __init__(self, request):
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34 self.request = request
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35
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36
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37 class PageEvent(Event):
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38 """An event related to a page change"""
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39 def __init__(self, request):
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40 Event.__init__(self, request)
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41
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42
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43 class PageChangedEvent(PageEvent):
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44
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45 name = u"PageChangedEvent"
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46 description = _(u"""Page has been modified""")
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47 req_superuser = False
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48
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49 def __init__(self, request, page, comment):
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50 PageEvent.__init__(self, request)
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51 self.page = page
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52 self.comment = comment
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53
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54
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55 class TrivialPageChangedEvent(PageEvent):
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56
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57 name = u"TrivialPageChangedEvent"
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58 description = _(u"Page has been modified in a trivial fashion")
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59 req_superuser = False
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61 def __init__(self, request, page, comment):
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62 PageEvent.__init__(self, request)
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63 self.page = page
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64 self.comment = comment
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65
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66
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67 class PageRenamedEvent(PageEvent):
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68
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69 name = u"PageRenamedEvent"
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70 description = _(u"""Page has been renamed""")
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71 req_superuser = False
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72
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73 def __init__(self, request, page, old_page, comment=""):
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74 PageEvent.__init__(self, request)
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75 self.page = page
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76 self.old_page = old_page
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77 self.comment = comment
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78
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79
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80 class PageDeletedEvent(PageEvent):
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81
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82 name = u"PageDeletedEvent"
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83 description = _(u"""Page has been deleted""")
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84 req_superuser = False
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85
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86 def __init__(self, request, page, comment):
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87 PageEvent.__init__(self, request)
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88 self.page = page
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89 self.comment = comment
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91
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92 class PageCopiedEvent(PageEvent):
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93
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94 name = u"PageCopiedEvent"
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95 description = _(u"""Page has been copied""")
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96 req_superuser = False
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97
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98 def __init__(self, request, page, old_page, comment):
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99 PageEvent.__init__(self, request)
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100 self.page = page
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101 self.old_page = old_page
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102 self.comment = comment
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103
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104
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105 class FileAttachedEvent(PageEvent):
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106
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107 name = u"FileAttachedEvent"
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108 description = _(u"""A new attachment has been added""")
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109 req_superuser = False
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110
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111 def __init__(self, request, pagename, name, size):
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112 PageEvent.__init__(self, request)
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113 self.request = request
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114 self.pagename = pagename
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115 self.name = name
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116 self.size = size
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117
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118
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119 class PageRevertedEvent(PageEvent):
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120
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121 name = u"PageRevertedEvent"
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122 description = _(u"""A page has been reverted to a previous state""")
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123 req_superuser = False
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124
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125 def __init__(self, request, pagename, previous, current):
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126 PageEvent.__init__(self, request)
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127 self.pagename = pagename
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128 self.previous = previous
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129 self.current = current
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130
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131
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132 class SubscribedToPageEvent(PageEvent):
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133
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134 name = u"SubscribedToPageEvent"
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135 description = _(u"""A user has subscribed to a page""")
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136 req_superuser = True
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137
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138 def __init__(self, request, pagename, username):
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139 PageEvent.__init__(self, request)
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140 self.pagename = pagename
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141 self.username = username
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142
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143
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144 class JabberIDSetEvent(Event):
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145 """ Sent when user changes her Jabber ID """
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146
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147 def __init__(self, request, jid):
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148 Event.__init__(self, request)
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149 self.jid = jid
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150
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151 class JabberIDUnsetEvent(Event):
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152 """ Sent when Jabber ID is no longer used
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153
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154 Obviously this will be usually sent along with JabberIDSetEvent,
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155 because we require user's jabber id to be unique by default.
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156
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157 """
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158 def __init__(self, request, jid):
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159 Event.__init__(self, request)
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160 self.jid = jid
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161
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162 class UserCreatedEvent(Event):
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163 """ Sent when a new user has been created """
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164
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165 name = u"UserCreatedEvent"
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166 description = _(u"""A new account has been created""")
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167 req_superuser = True
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168
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169 def __init__(self, request, user):
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170 Event.__init__(self, request)
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171 self.user = user
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172
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173 class PagePreSaveEvent(Event):
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174 """ Event sent when a page is about to be saved
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175
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176 This can be used to abort a save, for instance,
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177 if handler returns
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178
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179 """
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180 def __init__(self, request, page_editor, new_text):
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181 Event.__init__(self, request)
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182 self.page_editor = page_editor
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183 self.new_text = new_text
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184
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185
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186 class EventResult:
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187 """ This is a base class for messages passed from event handlers """
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188 pass
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189
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190 class Abort(EventResult):
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191 """ Result returned if handler wants to abort operation that sent the event """
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192 def __init__(self, reason):
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193 """
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194 @param reason: human-readable reason of failure
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195 """
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196 self.reason = reason
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197
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198
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199 def get_handlers(cfg):
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200 """Create a list of available event handlers.
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201
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202 Each handler is a handle() function defined in an plugin,
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203 pretty much like in case of actions.
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204
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205 TODO: maybe make it less dumb? ;-)
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206
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207 """
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208 event_handlers = []
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209 names = wikiutil.getPlugins("events", cfg)
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210
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211 for name in names:
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212 try:
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213 handler = wikiutil.importPlugin(cfg, "events", name, "handle")
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214 except PluginAttributeError:
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215 handler = None
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216
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217 if handler is not None:
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218 event_handlers.append(handler)
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219
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220 return event_handlers
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221
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222
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223 def send_event(event):
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224 """Function called from outside to process an event
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225
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226 @return: a list of messages returned by handlers
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227 @rtype: list
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228 """
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229
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230 # A list of messages generated by event handlers, passed back to caller
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231 msg = []
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232 cfg = event.request.cfg
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233
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234 # Try to handle the event with each available handler (for now)
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235 for handle in cfg.event_handlers:
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236 retval = handle(event)
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237
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238 assert retval is None or isinstance(retval, EventResult)
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239
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240 if retval:
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241 msg.append(retval)
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242
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243 return msg
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244
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245 def get_subscribable_events():
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246 """Create and return a list of user-visible events
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247
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248 @return: A list of user-visible events described by dictionaries
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249 @rtype: dict
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250 """
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251 defs = globals()
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252 subscribable_events = {}
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253
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254 for ev in defs.values():
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255 if type(ev) is type and issubclass(ev, Event) and ev.__dict__.has_key("description") and ev.__dict__.has_key("name"):
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256 subscribable_events[ev.name] = {'desc': ev.description, 'superuser': ev.req_superuser}
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257
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258 return subscribable_events
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259
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260 # Get rid of the dummy getText so that it doesn't get imported with *
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261 del _