tungstenite 0.8.0

#[macro_use] extern crate log;
extern crate env_logger;
extern crate tungstenite;

use std::net::{TcpListener, TcpStream};
use std::thread::spawn;

use tungstenite::{accept, HandshakeError, Error, Result, Message};
use tungstenite::handshake::HandshakeRole;

fn must_not_block<Role: HandshakeRole>(err: HandshakeError<Role>) -> Error {
    match err {
        HandshakeError::Interrupted(_) => panic!("Bug: blocking socket would block"),
        HandshakeError::Failure(f) => f,
    }
}

fn handle_client(stream: TcpStream) -> Result<()> {
    let mut socket = accept(stream).map_err(must_not_block)?;
    loop {
        match socket.read_message()? {
            msg @ Message::Text(_) |
            msg @ Message::Binary(_) => {
                socket.write_message(msg)?;
            }
            Message::Ping(_) |
            Message::Pong(_) |
            Message::Close(_) => {}
        }
    }
}

fn main() {
    env_logger::init();

    let server = TcpListener::bind("127.0.0.1:9001").unwrap();

    for stream in server.incoming() {
        spawn(move || {
            match stream {
                Ok(stream) => match handle_client(stream) {
                    Ok(_) => (),
                    Err(e) => warn!("Error in client: {}", e),
                },
                Err(e) => warn!("Error accepting stream: {}", e),
            }
        });
    }
}