view src/tools/trigger.py @ 2144:1d3f73e065e1

core, jp: component handling + client handling refactoring: - SàT can now handle components - plugin have now a "modes" key in PLUGIN_INFO where they declare if they can be used with clients and or components. They default to be client only. - components are really similar to clients, but with some changes in behaviour: * component has "entry point", which is a special plugin with a componentStart method, which is called just after component is connected * trigger end with a different suffixes (e.g. profileConnected vs profileConnectedComponent), so a plugin which manage both clients and components can have different workflow * for clients, only triggers of plugins handling client mode are launched * for components, only triggers of plugins needed in dependencies are launched. They all must handle component mode. * component have a sendHistory attribute (False by default) which can be set to True to allow saving sent messages into history * for convenience, "client" is still used in method even if it can now be a component * a new "component" boolean attribute tells if we have a component or a client * components have to add themselve Message protocol * roster and presence protocols are not added for components * component default port is 5347 (which is Prosody's default port) - asyncCreateProfile has been renamed for profileCreate, both to follow new naming convention and to prepare the transition to fully asynchronous bridge - createProfile has a new "component" attribute. When used to create a component, it must be set to a component entry point - jp: added --component argument to profile/create - disconnect bridge method is now asynchronous, this way frontends can know when disconnection is finished - new PI_* constants for PLUGIN_INFO values (not used everywhere yet) - client/component connection workflow has been moved to their classes instead of being a host methods - host.messageSend is now client.sendMessage, and former client.sendMessage is now client.sendMessageData. - identities are now handled in client.identities list, so it can be updated dynamically by plugins (in the future, frontends should be able to update them too through bridge) - profileConnecting* profileConnected* profileDisconnected* and getHandler now all use client instead of profile
author Goffi <goffi@goffi.org>
date Sun, 12 Feb 2017 17:55:43 +0100
parents 2daf7b4c6756
children 8b37a62336c3
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#!/usr/bin/env python2
# -*- coding: utf-8 -*-

# SAT: a jabber client
# Copyright (C) 2009-2016 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(_(u"There is already a bound priority [%s]") % point_name)
            else:
                log.debug(_(u"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 trigger for that point will be run
        @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:
                if not trigger(*args, **kwargs):
                    return False
            except SkipOtherTriggers:
                break
        return True