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Temp subscriptions #237
Description
Sitting here with @jkarneges and talking about fanout and temporary subscriptions.
The node server had temp subscriptions to show realtime updates to non-auth'd users (webpage continuously updating). Incidentally it's also what Fanout uses for scaling requests.
What's involved in getting this functionality back?
Activity
lloydwatkin commentedon Sep 24, 2014
I'm not sure any of the current contributors worked on temporary subscriptions, so no idea. Do you know how they worked?
jkarneges commentedon Sep 24, 2014
Clients send directed presence to the pubsub service, and then include the pubsub#expire option when subscribing to a node. Details here:
http://xmpp.org/extensions/xep-0060.html#impl-tempsub
By the way, temporary subscriptions are useful even for authed users. They can be used to receive updates from a channel without an explicit "follow". The webclient supported this. Users could browse to any channel and see realtime updates, whether logged in or not, without having to follow first.
Schnouki commentedon Sep 24, 2014
Pretty much as described in XEP-0060:
pubsub#expireset topresencewere saved in the DB with the "temporary" flag set to TRUEunavailablepresence from the subscriberThe trickiest part was to get federated servers to notify the current servers of changed in a remote channel where the only local subscriber has a temporary subscription. I don't remember how I did that; perhaps it's a corner case that can be ignored to begin with.