Create Webhooks listener supporting multiple clients

[morrieinmaas]

What?

The aries controller agent currently doesn't support multiple listeners for webhooks

Why?

The new multitenant feature introduced in aca-py v0.6 entails that multiple subwallet holders on the same basewallet controller want to listen to webhooks from a single agent.

Breakdown

Essentially the pub/sub mechanism should use sockets to broadcast from one webhook handler (server) to multiple listeners (clients). Or other sensible approach.

• Rewrite server to use sockets
• Rewrite clients to listen to socket connection
• ensure multiple clients can listen to the server
• ensure broadcasting to multiple clients is performant

[wip-abramson]

This would be awesome to have in before I push the course so thanks for getting cracking!

[morrieinmaas]

I've had a go at this and tbh it's not clear to me from the aca-pu docs how this is meant to work (at all).