annotate MoinMoin/events/__init__.py @ 2095:258d6e648eca

Add a JabberIDUnsetEvent; make some private symbols internal in MoinMoin.events
author Karol 'grzywacz' Nowak <grzywacz@sul.uni.lodz.pl>
date Tue, 05 Jun 2007 00:47:10 +0200
parents 9ee68c8b409b
children 1577663f6354
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 from MoinMoin import wikiutil
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13 from MoinMoin.util import pysupport
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14 from MoinMoin.wikiutil import PluginAttributeError
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17 # A list of available event handlers
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18 _event_handlers = None
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19
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20 # Create a list of extension actions from the package directory
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21 modules = pysupport.getPackageModules(__file__)
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24 class Event:
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25 """A class handling information common to all events."""
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26 def __init__(self, request):
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27 self.request = request
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28
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30 class PageEvent(Event):
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31 """An event related to a page change"""
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32 def __init__(self, request):
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33 Event.__init__(self, request)
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35
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36 class PageChangedEvent(PageEvent):
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37 def __init__(self, request, page, comment, trivial):
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38 PageEvent.__init__(self, request)
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39 self.page = page
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40 self.comment = comment
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41 self.trivial = trivial
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42
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43
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44 class PageRenamedEvent(PageEvent):
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45 pass
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46 class PageDeletedEvent(PageEvent):
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47 pass
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48 class FileAttachedEvent(PageEvent):
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49 pass
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51
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52 class PageRevertedEvent(PageEvent):
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53 def __init__(self, request, pagename, previous, current):
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54 PageEvent.__init__(self, request)
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55 self.pagename = pagename
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56 self.previous = previous
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57 self.current = current
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59
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60 class SubscribedToPageEvent(PageEvent):
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61 def __init__(self, request, pagename, username):
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62 PageEvent.__init__(self, request)
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63 self.pagename = pagename
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64 self.username = username
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65
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66
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67 class JabberIDSetEvent(Event):
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68 """ Sent when user changes her Jabber ID """
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69 def __init__(self, request, jid):
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70 Event.__init__(self, request)
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71 self.jid = jid
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72
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73 class JabberIDUnsetEvent(Event):
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74 """ Sent when Jabber ID is no longer used
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76 Obviously this will be usually sent along with JabberIDSetEvent,
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77 because we require user's jabber id to be unique by default.
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78 """
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79 def __init__(self, request, jid):
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80 Event.__init__(self, request)
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81 self.jid = jid
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82
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83 def _register_handlers(cfg):
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84 """Create a list of available event handlers.
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86 Each handler is a handle() function defined in an plugin,
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87 pretty much like in case of actions.
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89 TODO: maybe make it less dumb? ;-)"""
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90
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91 global _event_handlers
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93 _event_handlers = []
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94 names = wikiutil.getPlugins("events", cfg)
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96 for name in names:
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97 try:
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98 handler = wikiutil.importPlugin(cfg, "events", name, "handle")
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99 except PluginAttributeError:
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100 handler = None
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101
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102 if handler is not None:
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103 _event_handlers.append(handler)
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104
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105
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106 def send_event(event):
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107 """Function called from outside to process an event"""
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108
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109 # A list of messages generated by event handlers, passed back to caller
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110 msg = []
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111
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112 # Find all available event handlers
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113 if _event_handlers is None:
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114 _register_handlers(event.request.cfg)
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115
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116 # Try to handle the event with each available handler (for now)
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117 for handle in _event_handlers:
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118 retval = handle(event)
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119 if isinstance(retval, unicode):
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120 msg.append(retval)
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121
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122 return msg