Websocket server mutable HashMaps ?

[fabracht]

Hi everyone. I wrote a websocket server with actix and I would like to ask a question.
I followed a bunch of different tutorials and examples to write this. You can find it at my git repo.
https://github.com/fabracht/actix-websocket

What I want to ask is if there is a problem in not wrapping these struct values as they are:

Or should I wrap them in a Mutex. I'm having some difficulties understanding how the address:

in main on line 14 gets shared between threads.