rust-websocket | A WebSocket (RFC6455) library written in Rust | Websocket library

I'm trying to wrap my head around futures in Rust but I am confused by this code which is supposed to send messages arriving at rx to sink:

I want to write a webserver using Rust, Hyper and websocket-rs. The webserver must be able to handle http requests AND websocket requests on the same port. I used the official sample (async-server.rs: https://github.com/cyderize/rust-websocket/blob/master/examples/async-server.rs) and tried to modify it. My idea was to change the error handling. If the client's request is a simple http request then do not return an error, but spawn a future which handles the request instead.

Based on another SO question (How do I handle an error when using rust-websocket so that only that connection fails and not the entire program?) I changed the error handling from the sample.

This is the old code:

I am writing a Phoenix client library for Rust, taking advantage of the async websocket client from rust-websockets. Right now I am having trouble figuring out how to pass callback functions in to the thread that is handling the websocket traffic. I have a simplified struct:

I am writing a websocket server in Rust using rust-websocket and its Tokio-based async system. I can serve clients just fine, however, I can not figure out how to share mutable state between the clients. Here is some (partial) code demonstrating this issue:

I'm trying to use error-chain with the websocket crate, but running into an issue that I'm not sure how to resolve. WsUpgrade::accept has the following signature: