Starting the server

The program we just wrote does absolutely nothing, so let's update it so that it at least starts a server, using tokio. Let's write an actual body to our server() function:

use std::net::{IpAddr, Ipv4Addr, SocketAddr};

use tokio_core::reactor::Handle;
use tokio_core::net::TcpListener;

#[async]
fn server(handle: Handle) -> io::Result<()> {
    let port = 1234;
    let addr = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), port);
    let listener = TcpListener::bind(&addr, &handle)?;

    println!("Waiting clients on port {}...", port);
    #[async]
    for (stream, addr) in listener.incoming() {
        let address = format!("[address : {}]", addr);
        println!("New client: {}", address);
        handle.spawn(handle_client(stream));
        println!("Waiting another client...");
    }
    Ok(())
}

The function now takes a Handle, which will be useful to specify on which event loop the server must run. We start this function by specifying...