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mod_smacks/README.markdown

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mod_smacks/README.markdown @ 4559:33b1b6ff23d8

mod_measure_stanza_counts: port to new metrics API See https://prosody.im/doc/developers/core/statsmanager#metric
author Jonas Schäfer <jonas@wielicki.name>
date Thu, 20 May 2021 15:25:07 +0200
parent 3967:0957ba6aeb99
child 4678:0bcbff950f14
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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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6
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7 Introduction
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8 ============
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9
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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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13
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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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18
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19 Details
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20 =======
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21
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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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29
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30 If the client fails to reconnect before the timeout it will be marked as
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31 offline like prosody does on disconnect without mod_smacks.
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32 If the client is the last one for this jid, all message stanzas are added to
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33 the offline store and all other stanzas stanzas are returned with an
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34 "recipient-unavailable" error. If the client is not the last one with an
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35 open smacks session, *all* stanzas are returned with an "recipient-unavailable" error.
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36
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37 If you deliberately disabled [mod_offline], all message stanzas of the last client
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38 are also returned with an "recipient-unavailable" error, because the can not be
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39 added to the offline storage.
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40 If you don't want this behaviour you can use [mod_nooffline_noerror] to suppress the error.
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41 This is generally only advisable, if you are sure that all your clients are using MAM!
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42
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43 This module also provides some events used by [mod_cloud_notify].
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44 These events are: "smacks-ack-delayed", "smacks-hibernation-start" and
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45 "smacks-hibernation-end". See [mod_cloud_notify] for details on how this
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46 events are used there.
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47
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48 Use prosody 0.10+ to have per user limits on allowed sessions in hibernation
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49 state and allowed sessions for which the h-value is kept even after the
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50 hibernation timed out.
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51 These are settable using `smacks_max_hibernated_sessions` and `smacks_max_old_sessions`.
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52
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53 Configuration
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54 =============
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56 Option Default Description
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57 ---------------------------------- ----------------- ------------------------------------------------------------------------------------------------------------------
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58 `smacks_hibernation_time` 600 (10 minutes) The number of seconds a disconnected session should stay alive for (to allow reconnect)
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59 `smacks_enabled_s2s` false Enable Stream Management on server connections? *Experimental*
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60 `smacks_max_unacked_stanzas` 0 How many stanzas to send before requesting acknowledgement
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61 `smacks_max_ack_delay` 30 (1/2 minute) The number of seconds an ack must be unanswered to trigger an "smacks-ack-delayed" event
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62 `smacks_max_hibernated_sessions` 10 The number of allowed sessions in hibernated state (limited per user)
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63 `smacks_max_old_sessions` 10 The number of allowed sessions with timed out hibernation for which the h-value is still kept (limited per user)
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64
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65 Compatibility
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66 =============
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67
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68 ----- -----------------------------------------------------------------------------
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69 0.10 Works
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70 0.9 Works, no per user limit of hibernated sessions
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71 0.8 Works, no per user limit of hibernated sessions, use version [7693724881b3]
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72 ----- -----------------------------------------------------------------------------
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73
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74
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75 Clients
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76 =======
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77
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78 Clients that support [XEP-0198]:
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79
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80 - Gajim (Linux, Windows, OS X)
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81 - Conversations (Android)
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82 - ChatSecure (iOS)
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83 - Swift (but not resumption, as of version 2.0 and alphas of 3.0)
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84 - Psi (in an unreleased branch)
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85 - Yaxim (Android)
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86 - Monal (iOS)
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87
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88 [7693724881b3]: //hg.prosody.im/prosody-modules/raw-file/7693724881b3/mod_smacks/mod_smacks.lua
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89 [mod_offline]: //modules.prosody.im/mod_offline
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90 [mod_nooffline_noerror]: //modules.prosody.im/mod_nooffline_noerror
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91 [mod_cloud_notify]: //modules.prosody.im/mod_cloud_notify