feature/2 error when using same client id

[Joxtacy]

• feat(server): can't use already existing client id
• style: run cargo fmt

Closes #2

[svnoak]

@Joxtacy I've created a separate PR (#5) and cherry picked the commit with the style formatting changes.
Please rebase this branch to have it reflect the changes in main.

[svnoak]

Thanks for the PR!
I think it would be best to move the check of existing active websockets and the possible rejection for the given client_id to the ws_handler, before upgrading the connection. That way we wouldn't open and close unnecessary websocket connections for rejected client_ids.

[Joxtacy]

Thanks for the PR! I think it would be best to move the check of existing active websockets and the possible rejection for the given client_id to the ws_handler, before upgrading the connection. That way we wouldn't open and close unnecessary websocket connections for rejected client_ids.

Yeah, good point. I'll fix that!