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annotate src/browser/sat_browser/plugin_xep_0085.py @ 681:3b185ccb70b4

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browser side: updated trigger import according to backend renaming (sat.tools.misc is now sat.tools.trigger)
author Goffi <goffi@goffi.org>
date Thu, 19 Mar 2015 17:27:22 +0100
parents c6380dd30602
children 9877607c719a
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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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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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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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51 # Here we should check the value of the parameter "Send chat state notifications"
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52 # but this costs two messages. It's even better to call chatStateComposing
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53 # with a doubt, it will be checked by the back-end anyway before sending
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54 # the actual notifications to the other client.
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55 if state == "composing" and not self.started:
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56 return
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57 self.started = True
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58 self.next_state = state
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59 self.__onEvent(None)
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61 def __onEvent(self, timer):
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62 state = self.next_state
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64 assert(state in TRANSITIONS)
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65 transition = TRANSITIONS[state]
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66 assert("next_state" in transition and "delay" in transition)
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68 if state != self.state and state == "composing":
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69 self.host.bridge.call('chatStateComposing', None, self.target_s)
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71 self.state = state
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72 if self.timer is not None:
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73 self.timer.cancel()
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74
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75 if transition["next_state"] and transition["delay"] > 0:
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76 self.next_state = transition["next_state"]
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77 self.timer = Timer(transition["delay"] * 1000, self.__onEvent) # pyjamas timer is in milliseconds