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Building an ActivityPub Server (rknight.me)

submitted 2 years ago by [email protected] to c/selfhosted

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[–] [email protected] 3 points 2 years ago (1 children)

I think that would only work when the number of instances is small. Two solutions to this might be:

have instances act like relays where the home instance of a community notifies 10 instances and then each of those instances notifies 10 instances, etc.
batch updates on a timer such that once a minute all posts, comments, boosts, etc within a minutes are buffered and sent together.

[–] savjee 1 points 2 years ago

I looked at how many WebSocket connections a single server could keep open, and it seems quite high: https://unetworkingab.medium.com/millions-of-active-websockets-with-node-js-7dc575746a01

That being said, I do agree with you that it's inefficient to open a connection to every other instance.

About your proposals:

I don't think your first solution is feasible. How would an instance know which other 10 instances to notify?
I do like your idea of batching operations together! Would definitely cut back on the amount of HTTP calls and signature validations. Perhaps this can even be extended further: right now every user interaction is signed before its been sent to other instances. Would be interesting if the instance itself also has a public/private key and that it can sign a whole batch at once (rather then signing every single user interaction).