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annotate src/tools/trigger.py @ 2509:d485e9416493

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core (memory/cache): common cache: host has now a common_cache attribute for data which can be shared between profiles. client.cache is for private data
author Goffi <goffi@goffi.org>
date Fri, 02 Mar 2018 17:40:09 +0100
parents af4a38ebf52a
children
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rev   line source
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2daf7b4c6756 use of /usr/bin/env instead of /usr/bin/python in shebang
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1 #!/usr/bin/env python2
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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) 2009-2018 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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19
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20 """Misc usefull classes"""
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21
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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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26
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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 following triggers list """
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33 pass
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35
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36 class TriggerManager(object):
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37 """This class manage triggers: code which interact to change the behaviour of SàT"""
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39 try: # FIXME: to be removed when a better solution is found
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40 MIN_PRIORITY = float('-inf')
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41 MAX_PRIORITY = float('+inf')
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42 except: # XXX: Pyjamas will bug if you specify ValueError here
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43 # Pyjamas uses the JS Float class
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44 MIN_PRIORITY = Number.NEGATIVE_INFINITY
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45 MAX_PRIORITY = Number.POSITIVE_INFINITY
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46
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47 def __init__(self):
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48 self.__triggers = {}
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50 def add(self, point_name, callback, priority=0):
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51 """Add a trigger to a point
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52
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53 @param point_name: name of the point when the trigger should be run
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54 @param callback: method to call at the trigger point
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55 @param priority: callback will be called in priority order, biggest
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56 first
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57 """
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58 if point_name not in self.__triggers:
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59 self.__triggers[point_name] = []
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60 if priority != 0 and priority in [trigger_tuple[0] for trigger_tuple in self.__triggers[point_name]]:
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61 if priority in (self.MIN_PRIORITY, self.MAX_PRIORITY):
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62 log.warning(_(u"There is already a bound priority [%s]") % point_name)
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63 else:
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64 log.debug(_(u"There is already a trigger with the same priority [%s]") % point_name)
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65 self.__triggers[point_name].append((priority, callback))
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66 self.__triggers[point_name].sort(key=lambda trigger_tuple:
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67 trigger_tuple[0], reverse=True)
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69 def remove(self, point_name, callback):
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70 """Remove a trigger from a point
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71
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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 """
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75 for trigger_tuple in self.__triggers[point_name]:
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76 if trigger_tuple[1] == callback:
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77 self.__triggers[point_name].remove(trigger_tuple)
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78 return
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79 raise TriggerException("Trying to remove an unexisting trigger")
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81 def point(self, point_name, *args, **kwargs):
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82 """This put a trigger point
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83
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84 All the triggers for that point will be run
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85 @param point_name: name of the trigger point
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86 @return: True if the action must be continued, False else
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87 """
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88 if point_name not in self.__triggers:
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89 return True
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90
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91 for priority, trigger in self.__triggers[point_name]:
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92 try:
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93 if not trigger(*args, **kwargs):
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94 return False
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95 except SkipOtherTriggers:
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96 break
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97 return True
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98
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99 def returnPoint(self, point_name, *args, **kwargs):
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100 """Like point but trigger must return (continue, return_value)
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101
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102 All triggers for that point must return a tuple with 2 values:
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103 - continue, same as for point, if False action must be finished
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104 - return_value: value to return ONLY IF CONTINUE IS FALSE
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105 @param point_name: name of the trigger point
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106 @return: True if the action must be continued, False else
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107 """
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108
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109 if point_name not in self.__triggers:
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110 return True
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111
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112 for priority, trigger in self.__triggers[point_name]:
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113 try:
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114 cont, ret_value = trigger(*args, **kwargs)
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115 if not cont:
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116 return False, ret_value
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117 except SkipOtherTriggers:
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118 break
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119 return True, None