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annotate src/browser/sat_browser/plugin_xep_0085.py @ 544:ad18eb65b6db

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browser_side (plugin OTR): forbid to start an OTR session if the contact is not connected
author souliane <souliane@mailoo.org>
date Mon, 08 Sep 2014 15:44:11 +0200
parents 97c72fe4a5f2
children c6380dd30602
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624a87377412 browser_side, plugin XEP-0085: limit the number of bridge methods calls for "chatStateComposing".
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1 #!/usr/bin/python
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT plugin for Chat State Notifications Protocol (xep-0085)
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5 # Copyright (C) 2013, 2014 Adrien Cossa (souliane@mailoo.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 from pyjamas.Timer import Timer
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21
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22
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23 # Copy of the map from sat/src/plugins/plugin_xep_0085
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24 TRANSITIONS = {"active": {"next_state": "inactive", "delay": 120},
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25 "inactive": {"next_state": "gone", "delay": 480},
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26 "gone": {"next_state": "", "delay": 0},
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27 "composing": {"next_state": "paused", "delay": 30},
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28 "paused": {"next_state": "inactive", "delay": 450}
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29 }
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30
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31
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32 class ChatStateMachine:
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33 """This is an adapted version of the ChatStateMachine from sat/src/plugins/plugin_xep_0085
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34 which manage a timer on the web browser and keep it synchronized with the timer that runs
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35 on the backend. This is only needed to avoid calling the bridge method chatStateComposing
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36 too often ; accuracy is not needed so we can ignore the delay of the communication between
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37 the web browser and the backend (the timer on the web browser always starts a bit before).
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38 /!\ Keep this file up to date if you modify the one in the sat plugins directory.
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39 """
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40 def __init__(self, host, target_s):
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41
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42 self.host = host
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43 self.target_s = target_s
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44 self.started = False
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45 self.state = None
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46 self.timer = None
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47
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48 def _onEvent(self, state):
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49 """Pyjamas callback takes no extra argument so we need this trick"""
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50 # Here we should check the value of the parameter "Send chat state notifications"
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51 # but this costs two messages. It's even better to call chatStateComposing
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52 # with a doubt, it will be checked by the back-end anyway before sending
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53 # the actual notifications to the other client.
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54 if state == "composing" and not self.started:
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55 return
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56 self.started = True
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57 self.next_state = state
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58 self.__onEvent(None)
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59
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60 def __onEvent(self, timer):
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61 # print "on event %s" % self.next_state
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62 state = self.next_state
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63 self.next_state = ""
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64 if state != self.state and state == "composing":
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65 self.host.bridge.call('chatStateComposing', None, self.target_s)
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66 self.state = state
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67 if not self.timer is None:
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68 self.timer.cancel()
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69
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70 if not state in TRANSITIONS:
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71 return
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72 if not "next_state" in TRANSITIONS[state]:
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73 return
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74 if not "delay" in TRANSITIONS[state]:
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75 return
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76 next_state = TRANSITIONS[state]["next_state"]
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77 delay = TRANSITIONS[state]["delay"]
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78 if next_state == "" or delay < 0:
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79 return
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80 self.next_state = next_state
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81 # pyjamas timer in milliseconds
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82 self.timer = Timer(delay * 1000, self.__onEvent)