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annotate libervia/backend/tools/trigger.py @ 4108:238e305f2306

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author Goffi <goffi@goffi.org>
date Thu, 06 Jul 2023 11:34:51 +0200
parents 4b842c1fb686
children 4dc00e848961
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1 #!/usr/bin/env python3
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2
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2021 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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16
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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 libervia.backend.core.i18n import _
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23 from libervia.backend.core.log import getLogger
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24
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25 log = getLogger(__name__)
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27
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28 class TriggerException(Exception):
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29 pass
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31
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32 class SkipOtherTriggers(Exception):
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33 """ Exception to raise if normal behaviour must be followed instead of following triggers list """
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34
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35 pass
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37
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38 class TriggerManager(object):
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39 """This class manage triggers: code which interact to change the behaviour 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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51
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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
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55 @param point_name: name of the point when the trigger should be run
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56 @param callback: method to call at the trigger point
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57 @param priority: callback will be called in priority order, biggest
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58 first
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59 """
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60 if point_name not in self.__triggers:
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61 self.__triggers[point_name] = []
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62 if priority != 0 and priority in [
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63 trigger_tuple[0] for trigger_tuple in self.__triggers[point_name]
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64 ]:
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65 if priority in (self.MIN_PRIORITY, self.MAX_PRIORITY):
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66 log.warning(_("There is already a bound priority [%s]") % point_name)
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67 else:
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68 log.debug(
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69 _("There is already a trigger with the same priority [%s]")
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70 % point_name
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71 )
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72 self.__triggers[point_name].append((priority, callback))
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73 self.__triggers[point_name].sort(
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74 key=lambda trigger_tuple: trigger_tuple[0], reverse=True
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75 )
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77 def remove(self, point_name, callback):
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78 """Remove a trigger from a point
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79
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80 @param point_name: name of the point when the trigger should be run
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81 @param callback: method to remove, must exists in the trigger point
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82 """
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83 for trigger_tuple in self.__triggers[point_name]:
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84 if trigger_tuple[1] == callback:
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85 self.__triggers[point_name].remove(trigger_tuple)
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86 return
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87 raise TriggerException("Trying to remove an unexisting trigger")
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89 def point(self, point_name, *args, **kwargs):
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90 """This put a trigger point
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91
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92 All the triggers for that point will be run
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93 @param point_name: name of the trigger point
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94 @param *args: args to transmit to trigger
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95 @param *kwargs: kwargs to transmit to trigger
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96 if "triggers_no_cancel" is present, it will be popup out
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97 when set to True, this argument don't let triggers stop
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98 the workflow
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99 @return: True if the action must be continued, False else
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100 """
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101 if point_name not in self.__triggers:
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102 return True
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103
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104 can_cancel = not kwargs.pop('triggers_no_cancel', False)
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105
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106 for priority, trigger in self.__triggers[point_name]:
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107 try:
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108 if not trigger(*args, **kwargs) and can_cancel:
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109 return False
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110 except SkipOtherTriggers:
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111 break
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112 return True
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113
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114 def return_point(self, point_name, *args, **kwargs):
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115 """Like point but trigger must return (continue, return_value)
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116
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117 All triggers for that point must return a tuple with 2 values:
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118 - continue, same as for point, if False action must be finished
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119 - return_value: value to return ONLY IF CONTINUE IS FALSE
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120 @param point_name: name of the trigger point
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121 @return: True if the action must be continued, False else
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122 """
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123
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124 if point_name not in self.__triggers:
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125 return True
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126
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127 for priority, trigger in self.__triggers[point_name]:
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128 try:
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129 cont, ret_value = trigger(*args, **kwargs)
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130 if not cont:
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131 return False, ret_value
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132 except SkipOtherTriggers:
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133 break
af4a38ebf52a core (trigger): new returnPoint method:
Goffi <goffi@goffi.org>
parents: 2483
diff changeset
134 return True, None