Is there something like join_any?

[lz1998]

Is there something like join_any, which is similar to try_join.

I want to get the first Ok(TcpStream).

If all failed, then return Err.

    async fn connect(&self, _: &Arc<Client>) -> std::io::Result<TcpStream> {
        tokio::select! {
            conn1 = TcpStream::connect(SocketAddr::new(Ipv4Addr::new(1,2,3,4).into(), 80)) => {
                return conn1 // TODO if error, not return
            }
            conn2 = TcpStream::connect(SocketAddr::new(Ipv4Addr::new(5,6,7,8).into(), 80)) => {
                return conn2 // TODO if error, not return
            }
        }
    }

[Darksonn]

Use a pattern to disable the tokio::select! branch if it returns an error.

async fn connect(&self, _: &Arc<Client>) -> std::io::Result<TcpStream> {
    tokio::select! {
        Ok(conn1) = connect1() => Ok(conn1),
        Ok(conn2) = connect2() => Ok(conn2),
        else => Err(...)
    }
}

[lz1998]

Does select support vector? What should I do if there is a lot of addresses in a Vec?

[Darksonn]

No, but there are alternatives you can use for that situation. In Tokio, there is the JoinSet and in the futures crate there is FuturesUnordered. They can both be used to implement that.