tokio/tests/stream-buffered.rs

extern crate futures;
extern crate futures_io;
extern crate futures_mio;
extern crate env_logger;

use std::sync::Arc;
use std::thread;
use std::io::{self, Read, Write};

use futures::Future;
use futures::stream::Stream;
use futures_io::copy;
use futures_mio::TcpStream;

macro_rules! t {
    ($e:expr) => (match $e {
        Ok(e) => e,
        Err(e) => panic!("{} failed with {:?}", stringify!($e), e),
    })
}

#[test]
fn echo_server() {
    drop(env_logger::init());

    let mut l = t!(futures_mio::Loop::new());
    let srv = l.handle().tcp_listen(&"127.0.0.1:0".parse().unwrap());
    let srv = t!(l.run(srv));
    let addr = t!(srv.local_addr());

    let t = thread::spawn(move || {
        use std::net::TcpStream;

        let mut s1 = t!(TcpStream::connect(&addr));
        let mut s2 = t!(TcpStream::connect(&addr));

        let msg = b"foo";
        assert_eq!(t!(s1.write(msg)), msg.len());
        assert_eq!(t!(s2.write(msg)), msg.len());
        let mut buf = [0; 1024];
        assert_eq!(t!(s1.read(&mut buf)), msg.len());
        assert_eq!(&buf[..msg.len()], msg);
        assert_eq!(t!(s2.read(&mut buf)), msg.len());
        assert_eq!(&buf[..msg.len()], msg);
    });

    let future = srv.incoming()
                    .map(|s| Arc::new(s.0))
                    .map(|i| (SocketIo(i.clone()), SocketIo(i)))
                    .map(|(a, b)| copy(a, b).map(|_| ()))
                    .buffered(10)
                    .take(2)
                    .collect();

    t!(l.run(future));

    t.join().unwrap();
}

struct SocketIo(Arc<TcpStream>);

impl Read for SocketIo {
    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
        (&*self.0).read(buf)
    }
}

impl Write for SocketIo {
    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
        (&*self.0).write(buf)
    }

    fn flush(&mut self) -> io::Result<()> {
        (&*self.0).flush()
    }
}