`mix phx.routes` but for channels?

[i-n-g-m-a-r]

Question about listing channels and topics is also here:

How to get a list of all channel topics

I’ve been searching through the channels docs and the javascript client but can’t seem to find a way to retrieve all channel topics. The goal here is to create game lobbies, so for example users would be in the main lobby and have a list of joinable game lobbies. My plan was to have a channel for each of these, but I can’t seem to find a way to retrieve these channel topics, short of maybe having a genserver keep track of them, but I was hoping there would be something like Presence.

There’s definitely not a mix task for this.