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annotate src/tools/trigger.py @ 1535:c9ef16de3f13

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core: more robust plugins loading: - avoid stopping loading remaining plugins when a plugin raise an error - new error exceptions.MissingModule allows to detect a missing third party module, and to give instructions to get it - error during instanciation are catched too
author Goffi <goffi@goffi.org>
date Tue, 29 Sep 2015 17:54:23 +0200
parents 3265a2639182
children d17772b0fe22
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1 #!/usr/bin/python
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014, 2015 Jérôme Poisson (goffi@goffi.org)
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 """Misc usefull classes"""
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22 from sat.core.i18n import _
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23 from sat.core.log import getLogger
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24 log = getLogger(__name__)
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27 class TriggerException(Exception):
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28 pass
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31 class SkipOtherTriggers(Exception):
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32 """ Exception to raise if normal behaviour must be followed instead of
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33 following triggers list """
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34 pass
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37 class TriggerManager(object):
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38 """This class manage triggers: code which interact to change the behaviour
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39 of SàT"""
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41 try: # FIXME: to be removed when a better solution is found
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42 MIN_PRIORITY = float('-inf')
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43 MAX_PRIORITY = float('+inf')
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44 except: # XXX: Pyjamas will bug if you specify ValueError here
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45 # Pyjamas uses the JS Float class
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46 MIN_PRIORITY = Number.NEGATIVE_INFINITY
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47 MAX_PRIORITY = Number.POSITIVE_INFINITY
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49 def __init__(self):
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50 self.__triggers = {}
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52 def add(self, point_name, callback, priority=0):
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53 """Add a trigger to a point
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54 @param point_name: name of the point when the trigger should be run
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55 @param callback: method to call at the trigger point
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56 @param priority: callback will be called in priority order, biggest
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57 first
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58 """
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59 if point_name not in self.__triggers:
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60 self.__triggers[point_name] = []
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61 if priority != 0 and priority in [trigger_tuple[0] for trigger_tuple in self.__triggers[point_name]]:
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62 if priority in (self.MIN_PRIORITY, self.MAX_PRIORITY):
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63 log.warning(_(u"There is already a bound priority [%s]") % point_name)
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64 else:
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65 log.debug(_(u"There is already a trigger with the same priority [%s]") % point_name)
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66 self.__triggers[point_name].append((priority, callback))
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67 self.__triggers[point_name].sort(key=lambda trigger_tuple:
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68 trigger_tuple[0], reverse=True)
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70 def remove(self, point_name, callback):
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71 """Remove a trigger from a point
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72 @param point_name: name of the point when the trigger should be run
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73 @param callback: method to remove, must exists in the trigger point"""
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74 for trigger_tuple in self.__triggers[point_name]:
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75 if trigger_tuple[1] == callback:
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76 self.__triggers[point_name].remove(trigger_tuple)
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77 return
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78 raise TriggerException("Trying to remove an unexisting trigger")
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80 def point(self, point_name, *args, **kwargs):
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81 """This put a trigger point
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82 All the trigger for that point will be run
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83 @param point_name: name of the trigger point
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84 @return: True if the action must be continued, False else"""
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85 if point_name not in self.__triggers:
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86 return True
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88 for priority, trigger in self.__triggers[point_name]:
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89 try:
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90 if not trigger(*args, **kwargs):
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91 return False
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92 except SkipOtherTriggers:
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93 break
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94 return True