6a6f15707a
historically, Libervia (SàT before) was using camelCase as allowed by PEP8 when using a pre-PEP8 code, to use the same coding style as in Twisted. However, snake_case is more readable and it's better to follow PEP8 best practices, so it has been decided to move on full snake_case. Because Libervia has a huge codebase, this ended with a ugly mix of camelCase and snake_case. To fix that, this patch does a big refactoring by renaming every function and method (including bridge) that are not coming from Twisted or Wokkel, to use fully snake_case. This is a massive change, and may result in some bugs.
134 lines
4.9 KiB
Python
134 lines
4.9 KiB
Python
#!/usr/bin/env python3
|
|
|
|
|
|
# SAT: a jabber client
|
|
# Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
|
|
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU Affero General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU Affero General Public License for more details.
|
|
|
|
# You should have received a copy of the GNU Affero General Public License
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
"""Misc usefull classes"""
|
|
|
|
from sat.core.i18n import _
|
|
from sat.core.log import getLogger
|
|
|
|
log = getLogger(__name__)
|
|
|
|
|
|
class TriggerException(Exception):
|
|
pass
|
|
|
|
|
|
class SkipOtherTriggers(Exception):
|
|
""" Exception to raise if normal behaviour must be followed instead of following triggers list """
|
|
|
|
pass
|
|
|
|
|
|
class TriggerManager(object):
|
|
"""This class manage triggers: code which interact to change the behaviour of SàT"""
|
|
|
|
try: # FIXME: to be removed when a better solution is found
|
|
MIN_PRIORITY = float("-inf")
|
|
MAX_PRIORITY = float("+inf")
|
|
except: # XXX: Pyjamas will bug if you specify ValueError here
|
|
# Pyjamas uses the JS Float class
|
|
MIN_PRIORITY = Number.NEGATIVE_INFINITY
|
|
MAX_PRIORITY = Number.POSITIVE_INFINITY
|
|
|
|
def __init__(self):
|
|
self.__triggers = {}
|
|
|
|
def add(self, point_name, callback, priority=0):
|
|
"""Add a trigger to a point
|
|
|
|
@param point_name: name of the point when the trigger should be run
|
|
@param callback: method to call at the trigger point
|
|
@param priority: callback will be called in priority order, biggest
|
|
first
|
|
"""
|
|
if point_name not in self.__triggers:
|
|
self.__triggers[point_name] = []
|
|
if priority != 0 and priority in [
|
|
trigger_tuple[0] for trigger_tuple in self.__triggers[point_name]
|
|
]:
|
|
if priority in (self.MIN_PRIORITY, self.MAX_PRIORITY):
|
|
log.warning(_("There is already a bound priority [%s]") % point_name)
|
|
else:
|
|
log.debug(
|
|
_("There is already a trigger with the same priority [%s]")
|
|
% point_name
|
|
)
|
|
self.__triggers[point_name].append((priority, callback))
|
|
self.__triggers[point_name].sort(
|
|
key=lambda trigger_tuple: trigger_tuple[0], reverse=True
|
|
)
|
|
|
|
def remove(self, point_name, callback):
|
|
"""Remove a trigger from a point
|
|
|
|
@param point_name: name of the point when the trigger should be run
|
|
@param callback: method to remove, must exists in the trigger point
|
|
"""
|
|
for trigger_tuple in self.__triggers[point_name]:
|
|
if trigger_tuple[1] == callback:
|
|
self.__triggers[point_name].remove(trigger_tuple)
|
|
return
|
|
raise TriggerException("Trying to remove an unexisting trigger")
|
|
|
|
def point(self, point_name, *args, **kwargs):
|
|
"""This put a trigger point
|
|
|
|
All the triggers for that point will be run
|
|
@param point_name: name of the trigger point
|
|
@param *args: args to transmit to trigger
|
|
@param *kwargs: kwargs to transmit to trigger
|
|
if "triggers_no_cancel" is present, it will be popup out
|
|
when set to True, this argument don't let triggers stop
|
|
the workflow
|
|
@return: True if the action must be continued, False else
|
|
"""
|
|
if point_name not in self.__triggers:
|
|
return True
|
|
|
|
can_cancel = not kwargs.pop('triggers_no_cancel', False)
|
|
|
|
for priority, trigger in self.__triggers[point_name]:
|
|
try:
|
|
if not trigger(*args, **kwargs) and can_cancel:
|
|
return False
|
|
except SkipOtherTriggers:
|
|
break
|
|
return True
|
|
|
|
def return_point(self, point_name, *args, **kwargs):
|
|
"""Like point but trigger must return (continue, return_value)
|
|
|
|
All triggers for that point must return a tuple with 2 values:
|
|
- continue, same as for point, if False action must be finished
|
|
- return_value: value to return ONLY IF CONTINUE IS FALSE
|
|
@param point_name: name of the trigger point
|
|
@return: True if the action must be continued, False else
|
|
"""
|
|
|
|
if point_name not in self.__triggers:
|
|
return True
|
|
|
|
for priority, trigger in self.__triggers[point_name]:
|
|
try:
|
|
cont, ret_value = trigger(*args, **kwargs)
|
|
if not cont:
|
|
return False, ret_value
|
|
except SkipOtherTriggers:
|
|
break
|
|
return True, None
|