Mercurial > prosody-modules
view mod_pubsub_subscription/README.markdown @ 5173:460f78654864
mod_muc_rtbl: also filter messages
This was a bit tricky because we don't want to run the JIDs
through SHA256 on each message. Took a while to come up with this
simple plan of just caching the SHA256 of the JIDs on the
occupants.
This will leave some dirt in the occupants after unloading the
module, but that should be ok; once they cycle the room, the
hashes will be gone.
This is direly needed, otherwise, there is a tight race between
the moderation activities and the actors joining the room.
author | Jonas Schäfer <jonas@wielicki.name> |
---|---|
date | Tue, 21 Feb 2023 21:37:27 +0100 |
parents | 97fac0ba0469 |
children |
line wrap: on
line source
# Introduction This module lets you programmatically subscribe to updates from a [pubsub][xep0060] node, even if the pubsub service is remote. ## Example ``` {.lua} module:depends("pubsub_subscription"); module:add_item("pubsub-subscription", { service = "pubsub.example.com"; node = "otter_facts"; -- Callbacks: on_subscribed = function() module:log("info", "Otter facts incoming!"); end; on_item = function(event) module:log("info", "Random Otter Fact: %s", event.payload:get_text()); end; }); ``` ## Usage Ensure the module is loaded and add your subscription via the `:add_item` API. The item table MUST have `service` and `node` fields and SHOULD have one or more `on_<event>` callbacks. The JID of the pubsub service is given in `service` (could also be the JID of an user for advanced PEP usage) and the node is given in, unsurprisingly, the `node` field. The various `on_event` callback functions, if present, gets called when new events are received. The most interesting would be `on_item`, which receives incoming items. Available events are: `on_subscribed` : The subscription was successful, events may follow. `on_unsubscribed` : Subscription was removed successfully, this happens if the subscription is removed, which you would normally never do. `on_error` : If there was an error subscribing to the pubsub service. Receives a table with `type`, `condition`, `text`, and `extra` fields as argument. `on_item` : An item publication, the payload itself available in the `payload` field in the table provided as argument. The ID of the item can be found in `item.attr.id`. `on_retract` : When an item gets retracted (removed by the publisher). The ID of the item can be found in `item.attr.id` of the table argument.. `on_purge` : All the items were removed by the publisher. `on_delete` : The entire pubsub node was removed from the pubsub service. No subscription exists after this. ``` {.lua} event_payload = { -- Common prosody event entries: stanza = util.stanza; origin = util.session; -- PubSub service details service = "pubsub.example.com"; node = "otter_facts"; -- The pubsub event itself item = util.stanza; -- <item/> payload = util.stanza; -- actual payload, child of <item/> } ``` # Compatibility Should work with Prosody \>= 0.11.x