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| author | Kim Alvefur <zash@zash.se> |
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| date | Mon, 19 Dec 2016 07:48:48 +0100 |
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1 --- |
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2 labels: |
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3 - 'Stage-Alpha' |
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4 summary: 'XEP-0198: Reliability and fast reconnects for XMPP' |
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5 ... |
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7 Introduction |
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8 ============ |
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10 By default XMPP is as reliable as your network is. Unfortunately in some |
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11 cases that is not very reliable - in some network conditions disconnects |
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12 can be frequent and message loss can occur. |
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14 To overcome this, XMPP has an optional extension (XEP-0198: Stream |
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15 Management) which, when supported by both the client and server, can |
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16 allow a client to resume a disconnected session, and prevent message |
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17 loss. |
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19 Details |
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20 ======= |
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22 When using XEP-0198 both the client and the server keep a queue of the |
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23 most recently sent stanzas - this is cleared when the other end |
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24 acknowledges they have received the stanzas. If the client disconnects, |
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25 instead of marking the user offline the server pretends the client is |
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26 still online for a short (configurable) period of time. If the client |
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27 reconnects within this period, any stanzas in the queue that the client |
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28 did not receive are re-sent. |
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30 If the client fails to reconnect before the timeout then it is marked |
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31 offline as normal, and any stanzas in the queue are returned to the |
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32 sender as a "recipient-unavailable" error. |
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33 |
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34 If you don't want this behaviour on timeout you can use [mod_smacks_offline] |
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35 or [mod_smacks_noerror] to customize the behaviour further. |
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36 |
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37 This module also provides some events used by [mod_cloud_notify]. |
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38 These events are: "smacks-ack-delayed", "smacks-hibernation-start" and |
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39 "smacks-hibernation-end". See [mod_cloud_notify] for details on how this |
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40 events are used there. |
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41 |
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42 Configuration |
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43 ============= |
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45 Option Default Description |
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46 ------------------------------ ----------------- ----------------------------------------------------------------------------------------- |
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47 `smacks_hibernation_time` 300 (5 minutes) The number of seconds a disconnected session should stay alive for (to allow reconnect) |
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48 `smacks_enabled_s2s` false Enable Stream Management on server connections? *Experimental* |
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49 `smacks_max_unacked_stanzas` 0 How many stanzas to send before requesting acknowledgement |
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50 `smacks_max_ack_delay` 60 (1 minute) The number of seconds an ack must be unanswered to trigger an "smacks-ack-delayed" event |
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51 |
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52 Compatibility |
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53 ============= |
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55 ----- ----------------------------------- |
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56 0.10 Works |
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57 0.9 Works |
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58 0.8 Works, use version [7693724881b3] |
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59 ----- ----------------------------------- |
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60 |
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62 Clients |
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63 ======= |
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64 |
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67 - Gajim |
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68 - Swift (but not resumption, as of version 2.0 and alphas of 3.0) |
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69 - Psi (in an unreleased branch) |
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70 - Conversations |
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71 - Yaxim |
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72 |
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73 [7693724881b3]: //hg.prosody.im/prosody-modules/raw-file/7693724881b3/mod_smacks/mod_smacks.lua |
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74 [mod_smacks_offline]: //modules.prosody.im/mod_smacks_offline |
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75 [mod_smacks_noerror]: //modules.prosody.im/mod_smacks_noerror |
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76 [mod_cloud_notify]: //modules.prosody.im/mod_cloud_notify |
