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annotate mod_pubsub_subscription/README.markdown @ 4537:53ee391ca689

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mod_smacks: Fix traceback due to session being destroyed in send() Sending something can cause the OS to notice that the connection is dead and then the connection can be dead at this point. More likely if opportunistic_writes is enabled.
author Kim Alvefur <zash@zash.se>
date Thu, 01 Apr 2021 11:35:26 +0200
parents 97fac0ba0469
children
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1 # Introduction
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2
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3 This module lets you programmatically subscribe to updates from a
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4 [pubsub][xep0060] node, even if the pubsub service is remote.
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5
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6 ## Example
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7
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8 ``` {.lua}
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9 module:depends("pubsub_subscription");
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10 module:add_item("pubsub-subscription", {
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11 service = "pubsub.example.com";
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12 node = "otter_facts";
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13
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14 -- Callbacks:
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15 on_subscribed = function()
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16 module:log("info", "Otter facts incoming!");
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17 end;
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18
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19 on_item = function(event)
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20 module:log("info", "Random Otter Fact: %s", event.payload:get_text());
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21 end;
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22 });
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23 ```
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24
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25 ## Usage
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26
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27 Ensure the module is loaded and add your subscription via the
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28 `:add_item` API. The item table MUST have `service` and `node` fields
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29 and SHOULD have one or more `on_<event>` callbacks.
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30
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31 The JID of the pubsub service is given in `service` (could also be the
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32 JID of an user for advanced PEP usage) and the node is given in,
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33 unsurprisingly, the `node` field.
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34
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35 The various `on_event` callback functions, if present, gets called when
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36 new events are received. The most interesting would be `on_item`, which
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37 receives incoming items. Available events are:
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38
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39 `on_subscribed`
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40 : The subscription was successful, events may follow.
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41
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42 `on_unsubscribed`
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43 : Subscription was removed successfully, this happens if the
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44 subscription is removed, which you would normally never do.
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45
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46 `on_error`
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47 : If there was an error subscribing to the pubsub service. Receives a
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48 table with `type`, `condition`, `text`, and `extra` fields as
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49 argument.
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50
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51 `on_item`
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52 : An item publication, the payload itself available in the `payload`
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53 field in the table provided as argument. The ID of the item can be
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54 found in `item.attr.id`.
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55
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56 `on_retract`
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57 : When an item gets retracted (removed by the publisher). The ID of
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58 the item can be found in `item.attr.id` of the table argument..
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59
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60 `on_purge`
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61 : All the items were removed by the publisher.
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62
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63 `on_delete`
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64 : The entire pubsub node was removed from the pubsub service. No
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65 subscription exists after this.
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66
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67 ``` {.lua}
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68 event_payload = {
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69 -- Common prosody event entries:
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70 stanza = util.stanza;
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71 origin = util.session;
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72
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73 -- PubSub service details
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74 service = "pubsub.example.com";
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75 node = "otter_facts";
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76
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77 -- The pubsub event itself
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78 item = util.stanza; -- <item/>
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79 payload = util.stanza; -- actual payload, child of <item/>
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80 }
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81 ```
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82
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83 # Compatibility
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84
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85 Should work with Prosody \>= 0.11.x