Mercurial > libervia-backend
annotate sat/tools/trigger.py @ 2773:b7974814dd5b
jp (pubsub/search): fixed name for node_max
author | Goffi <goffi@goffi.org> |
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date | Sat, 12 Jan 2019 16:49:23 +0100 |
parents | 003b8b4b56a7 |
children | ab2696e34d29 |
rev | line source |
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1934
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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 |
2771 | 5 # Copyright (C) 2009-2019 Jérôme Poisson (goffi@goffi.org) |
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6 |
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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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11 |
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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 |
771 | 22 from sat.core.i18n import _ |
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23 from sat.core.log import getLogger |
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24 |
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25 log = getLogger(__name__) |
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26 |
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27 |
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28 class TriggerException(Exception): |
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29 pass |
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30 |
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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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36 |
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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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40 |
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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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48 |
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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(_(u"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 _(u"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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76 |
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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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88 |
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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 returnPoint(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 |
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134 return True, None |