how to close connection immediately? about actix-net HOT 1 OPEN

type Blocklist = Arc<RwLock<HashMap<IpAddr, Instant>>>;
...
let blocklist = Blocklist::default();
...
.on_connect({
            let blocklist = blocklist.clone();
            move |conn, data| {
                if let Some(tcp_stream) = conn.downcast_ref::<TcpStream>() {
                    let peer = tcp_stream.peer_addr().unwrap();
                    if blocklist.read().unwrap().contains_key(&peer.ip()) {
                          // the ref of tcp_stream is immutable, how to shut it down? ...
                    }
                    // if possible, i need to send tcpstream object to handles and determine whether to close it
                    data.insert(ConnectionInfo {
                        bind: tcp_stream.local_addr().unwrap(),
                        peer,
                        ttl: tcp_stream.ttl().ok(),
                    });
                } else {
                    unreachable!("connection should only be plaintext since no TLS is set up");
                }
            }
        })