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annotate sat/tools/trigger.py @ 2766:93a421de0e3d

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tools (common/data_objects): metadata parsing in BlogItems: metadata are parsed to deserialise some well known values like rsm index and count, and some properties have been added to have easier access. A "complete" property (or item in metadata) is set to True if we are on the last page, False if we are not, or None if we don't have enough data to know if we are on the last page or not.
author Goffi <goffi@goffi.org>
date Fri, 11 Jan 2019 16:35:13 +0100
parents 3a8e7ec4648a
children 003b8b4b56a7
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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
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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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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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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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48
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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
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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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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 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:
af4a38ebf52a core (trigger): new returnPoint method:
Goffi <goffi@goffi.org>
parents: 2483
diff changeset
133 break
af4a38ebf52a core (trigger): new returnPoint method:
Goffi <goffi@goffi.org>
parents: 2483
diff changeset
134 return True, None