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author Kim Alvefur <zash@zash.se>
date Mon, 03 Apr 2017 16:15:15 +0200
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6ab46ff685d0 mod_cloud_notify: Respect Daniel's business rules and remove endpoints on error
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1 XEP-0357 Business rules implementation in prosody
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2 =================================================
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3
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4 Daniel proposed some business rules for push notifications [^1]
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5 This document describes the various implementation details involved in
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6 implementing these rules in prosody.
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7
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8 Point 3 of Daniel's mail is implemented by setting two attributes
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9 on the session table when a client enables push for a session:
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10
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11 - push_identifier: this is push_jid .. "<" .. (push_node or "")
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12 (this value is used as key of the user_push_services table)
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13 - push_settings: this is a reference to the user_push_services[push_identifier]
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14
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15
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16 Point 4 of Daniel's mail contains the actual business rules
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17 -----------------------------------------------------------
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18
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19 **a)**
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20 CSI is honoured in this scenario because messages hold back by csi don't even
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21 reach the smacks module. mod_smacks has 3 events:
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22
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23 - smacks-ack-delayed: This event is triggered when the client doesn't respond to
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24 a smacks <r> in a configurable amount of time (default: 60 seconds).
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25 Mod_cloud_notify reacts on this event and sends out push notifications
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26 to the push service registered for this session in point 3 (see above) for all
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27 stanzas in the smacks queue (the queue is given in the event).
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28
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29 - smacks-hibernation-start: This event is triggered when the smacks session
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30 is put in hibernation state. The event contains the smacks queue, too.
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31 Mod_cloud_notify uses this event to send push notifications for all
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32 stanzas not already pushed and installs a "stanzas/out"-filter to
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33 react on new stanzas coming in while the session is hibernated.
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34 The push endpoint of the hibernated session is then also notified
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35 for every new stanza.
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36 - smacks-hibernation-end: This event is triggered, when the smacks hibernation
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37 is stopped (the smacks session is resumed) and used by Mod_cloud_notify
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38 to remove the "stanzas/out"-filter.
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39
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40 **b)**
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41 Mod_mam already provides an event named "archive-message-added" which is
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42 triggered every time a stanza is saved into the mam store.
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43 Mod_cloud_notify uses this event to send out push notifications to all
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44 push services registered for the user the stanza is for, but *only*
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45 to those push services not having an active (or smacks hibernated) session.
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46 Only those stanzas are considered that contain the "for_user" event attribute
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47 of mod_mam as the user part of the jid.
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48 This is done to ensure that mam archiving rules are honoured.
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49
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50 **c)**
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51 The "message/offline/handle"-hook is used to send out push notifications to all
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52 registered push services belonging to the user the offline stanza is for.
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53 This was already implemented in the first version of mod_cloud_notify.
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54
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55
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56 Some statements to related technologies/XEPs/modules
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57 ----------------------------------------------------
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58
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59 - carbons: These are handled as usual and don't interfere with these business rules
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60 at all. Smacks events are generated for carbon copies if needed and mod_cloud_notify
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61 uses them to wake up the device in question if needed, as normal stanzas would do, too.
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62
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63 - csi: Csi is honoured also, because every stanza hold back by mod_pump or other csi
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64 modules is never seen by the smacks module, thus not added to its queue and not
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65 forwarded to mod_cloud_notify by the smacks events.
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66 Mod_cloud_notify does only notify devices having no active or smacks hibernated session
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67 of new mam stored stanzas, so stanzas filtered by csi don't get to mod_cloud_notify
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68 this way neither.
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69
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70 - other technologies: There shouldn't be any issues with other technologies imho.
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71
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72 [^1]: https://mail.jabber.org/pipermail/standards/2016-February/030925.html