view src/browser/sat_browser/plugin_xep_0085.py @ 979:1d558dfb32ca

server: pages redirection: when using a redirection dict, a new "page" key can be used to redirect to a named page. "args" can be added to specified named arguments to set (will be put in request.args, in addition to existing ones). The redirection is done dynamically, during the request workflow.
author Goffi <goffi@goffi.org>
date Sun, 12 Nov 2017 12:56:46 +0100
parents f8a7a046ff9c
children
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#!/usr/bin/python
# -*- coding: utf-8 -*-

# SAT plugin for Chat State Notifications Protocol (xep-0085)
# Copyright (C) 2013-2016 Adrien Cossa (souliane@mailoo.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/>.

from pyjamas.Timer import Timer


# Copy of the map from sat/src/plugins/plugin_xep_0085
TRANSITIONS = {"active": {"next_state": "inactive", "delay": 120},
               "inactive": {"next_state": "gone", "delay": 480},
               "gone": {"next_state": "", "delay": 0},
               "composing": {"next_state": "paused", "delay": 30},
               "paused": {"next_state": "inactive", "delay": 450}
               }


class ChatStateMachine:
    """This is an adapted version of the ChatStateMachine from sat/src/plugins/plugin_xep_0085
    which manage a timer on the web browser and keep it synchronized with the timer that runs
    on the backend. This is only needed to avoid calling the bridge method chatStateComposing
    too often ; accuracy is not needed so we can ignore the delay of the communication between
    the web browser and the backend (the timer on the web browser always starts a bit before).
    /!\ Keep this file up to date if you modify the one in the sat plugins directory.
    """
    def __init__(self, host, target_s):

        self.host = host
        self.target_s = target_s
        self.started = False
        self.state = None
        self.timer = None

    def _onEvent(self, state):
        # Pyjamas callback takes no extra argument so we need this trick

        # Here we should check the value of the parameter "Send chat state notifications"
        # but this costs two messages. It's even better to call chatStateComposing
        # with a doubt, it will be checked by the back-end anyway before sending
        # the actual notifications to the other client.
        if state == "composing" and not self.started:
            return
        self.started = True
        self.next_state = state
        self.__onEvent(None)

    def __onEvent(self, timer):
        state = self.next_state

        assert(state in TRANSITIONS)
        transition = TRANSITIONS[state]
        assert("next_state" in transition and "delay" in transition)

        if state != self.state and state == "composing":
            self.host.bridge.call('chatStateComposing', None, self.target_s)

        self.state = state
        if self.timer is not None:
            self.timer.cancel()

        if transition["next_state"] and transition["delay"] > 0:
            self.next_state = transition["next_state"]
            self.timer = Timer(transition["delay"] * 1000, self.__onEvent)  # pyjamas timer is in milliseconds