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annotate libervia/backend/tools/trigger.py @ 4249:ba46d6a0ff3a

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doc: style/typos/URL fixes
author Goffi <goffi@goffi.org>
date Fri, 31 May 2024 11:08:20 +0200
parents 4dc00e848961
children 0d7bb4df2343
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1 #!/usr/bin/env python3
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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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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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22 import inspect
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23 from typing import Callable
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24 from libervia.backend.core.i18n import _
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25 from libervia.backend.core.log import getLogger
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26 from libervia.backend.core.core_types import SatXMPPEntity
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27
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28 log = getLogger(__name__)
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31 class TriggerException(Exception):
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32 pass
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35 class SkipOtherTriggers(Exception):
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36 """ Exception to raise if normal behaviour must be followed instead of following triggers list """
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38 pass
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41 class TriggerManager(object):
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42 """This class manage triggers: code which interact to change the behaviour of SàT"""
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44 try: # FIXME: to be removed when a better solution is found
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45 MIN_PRIORITY = float("-inf")
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46 MAX_PRIORITY = float("+inf")
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47 except: # XXX: Pyjamas will bug if you specify ValueError here
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48 # Pyjamas uses the JS Float class
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49 MIN_PRIORITY = Number.NEGATIVE_INFINITY
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50 MAX_PRIORITY = Number.POSITIVE_INFINITY
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52 def __init__(self):
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53 self.__triggers = {}
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54
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55 def is_available(self, args: list):
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56 """Check if plugin used in a client context, and if it's available"""
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57 if not args or not isinstance(args[0], SatXMPPEntity):
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58 # we are not in the context of a client
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59 return True
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60 client = args[0]
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61 if not client.is_component:
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62 # plugins are always avaialble for normal clients
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63 return True
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66 def add(self, point_name, callback: Callable, priority=0):
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67 """Add a trigger to a point
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68
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69 @param point_name: name of the point when the trigger should be run
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70 @param callback: method to call at the trigger point
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71 @param priority: callback will be called in priority order, biggest
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72 first
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73 """
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74 if point_name not in self.__triggers:
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75 self.__triggers[point_name] = []
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76 if priority != 0 and priority in [
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77 trigger_tuple[0] for trigger_tuple in self.__triggers[point_name]
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78 ]:
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79 if priority in (self.MIN_PRIORITY, self.MAX_PRIORITY):
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80 log.warning(_("There is already a bound priority [%s]") % point_name)
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81 else:
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82 log.debug(
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83 _("There is already a trigger with the same priority [%s]")
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84 % point_name
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85 )
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86 self.__triggers[point_name].append((priority, callback))
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87 self.__triggers[point_name].sort(
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88 key=lambda trigger_tuple: trigger_tuple[0], reverse=True
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89 )
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91 def add_with_check(
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92 self,
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93 point_name: str,
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94 plugin,
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95 callback: Callable,
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96 priority: int=0
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97 ) -> None:
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98 """Like [Add], but check session before running the trigger
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99
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100 This method is to be used for triggers which can run in components and are
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101 expecting a ``client``: as all plugins are not run for component, a check will be
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102 added before running the trigger, if the plugin is not valid for this component,
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103 the trigger is ignored. ``client`` must be the first positional argument.
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104
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105 @param point_name: name of the trigger point
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106 @param plugin: instance of the plugin using this trigger. This is necessary to
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107 check if the plugin is available in the session.
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108 @param callback: method to call at the trigger point
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109 @param priority: callback will be called in priority order, biggest first
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110 """
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111 if inspect.iscoroutinefunction(callback):
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112 async def async_wrapper(client: SatXMPPEntity, *args, **kwargs):
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113 if client.is_component and plugin not in client.plugins:
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114 log.debug(f"Ignoring {callback} as parent plugin is not available")
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115 return True
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116 else:
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117 return await callback(client, *args, **kwargs)
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118 self.add(point_name, async_wrapper, priority)
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119 else:
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120 def sync_wrapper(client: SatXMPPEntity, *args, **kwargs):
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121 if client.is_component and plugin not in client.plugins:
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122 log.debug(f"Ignoring {callback} as parent plugin is not available")
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123 return True
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124 else:
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125 return callback(client, *args, **kwargs)
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126 self.add(point_name, sync_wrapper, priority)
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127
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128 def remove(self, point_name, callback):
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129 """Remove a trigger from a point
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130
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131 @param point_name: name of the point when the trigger should be run
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132 @param callback: method to remove, must exists in the trigger point
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133 """
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134 for trigger_tuple in self.__triggers[point_name]:
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135 if trigger_tuple[1] == callback:
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136 self.__triggers[point_name].remove(trigger_tuple)
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137 return
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138 raise TriggerException("Trying to remove an unexisting trigger")
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139
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140 def point(self, point_name, *args, **kwargs):
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141 """This put a trigger point
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142
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143 All the triggers for that point will be run
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144 @param point_name: name of the trigger point
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145 @param *args: args to transmit to trigger
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146 @param *kwargs: kwargs to transmit to trigger
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147 if "triggers_no_cancel" is present, it will be popup out
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148 when set to True, this argument don't let triggers stop
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149 the workflow
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150 @return: True if the action must be continued, False else
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151 """
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152 if point_name not in self.__triggers:
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153 return True
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154
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155 can_cancel = not kwargs.pop('triggers_no_cancel', False)
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156
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157 for priority, trigger in self.__triggers[point_name]:
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158 try:
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159 if not trigger(*args, **kwargs) and can_cancel:
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160 return False
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161 except SkipOtherTriggers:
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162 break
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163 return True
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164
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165 def return_point(self, point_name, *args, **kwargs):
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166 """Like point but trigger must return (continue, return_value)
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167
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168 All triggers for that point must return a tuple with 2 values:
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169 - continue, same as for point, if False action must be finished
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170 - return_value: value to return ONLY IF CONTINUE IS FALSE
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171 @param point_name: name of the trigger point
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172 @return: True if the action must be continued, False else
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173 """
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174
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175 if point_name not in self.__triggers:
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176 return True
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177
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178 for priority, trigger in self.__triggers[point_name]:
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179 try:
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180 cont, ret_value = trigger(*args, **kwargs)
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181 if not cont:
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182 return False, ret_value
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183 except SkipOtherTriggers:
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184 break
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185 return True, None