this post was submitted on 15 Jun 2023
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A quick skim of the protocol documents suggests you're right: Activity Vocabulary doesn't even mention the "discovery" use case, and no allowance seems to have been made for it. I can't fathom what they were thinking.
The short-term workaround would be scraping the Web portal "Communities > Local" page of each instance periodically for a list (and cache the info centrally? Not sure.) Hopefully the raw HTML is parsable enough that you wouldn't have to involve Selenium (which I've used in my day job—it's awful) or its ilk.
The correct fix is, of course, to add the "discovery" case and messages supporting it to the protocol, either as an extension or as core for the next version. This might take years.
It might be worth asking browse.feddit.de how they get their information.
@nyan so it's not only me missing the elephant in the room. O_o
That's a pretty huge gap. Which has severe consequences all the way down the pipe...
There's a current issue with lemmy with comments not being synchronized properly. Possibly a direct consequence of the entire system replication being push with no backup pull or reconciliation in the protocol.
I'm looking into a couple directions right now, but this is completely breaking the foundational promise of the very concept of fediverse...
It's possible that if you're trying to build a Twitter substitute on top of the protocol, the issue looks like a mere Sicilian dwarf elephant, since Twitter doesn't have great discoverability either (or need it, really), and synchronization hiccups matter less for that kind of service. It's when you're trying to build a Reddit/Usenet substitute that things fall down.
But yeah, it really is a gap in the design.