third_party/rust_crates/vendor/tokio/tests/uds_datagram.rs

#![warn(rust_2018_idioms)]
#![cfg(feature = "full")]
#![cfg(unix)]

use tokio::net::UnixDatagram;

use std::io;

async fn echo_server(mut socket: UnixDatagram) -> io::Result<()> {
    let mut recv_buf = vec![0u8; 1024];
    loop {
        let (len, peer_addr) = socket.recv_from(&mut recv_buf[..]).await?;
        if let Some(path) = peer_addr.as_pathname() {
            socket.send_to(&recv_buf[..len], path).await?;
        }
    }
}

#[tokio::test]
async fn echo() -> io::Result<()> {
    let dir = tempfile::tempdir().unwrap();
    let server_path = dir.path().join("server.sock");
    let client_path = dir.path().join("client.sock");

    let server_socket = UnixDatagram::bind(server_path.clone())?;

    tokio::spawn(async move {
        if let Err(e) = echo_server(server_socket).await {
            eprintln!("Error in echo server: {}", e);
        }
    });

    {
        let mut socket = UnixDatagram::bind(&client_path).unwrap();
        socket.connect(server_path)?;
        socket.send(b"ECHO").await?;
        let mut recv_buf = [0u8; 16];
        let len = socket.recv(&mut recv_buf[..]).await?;
        assert_eq!(&recv_buf[..len], b"ECHO");
    }

    Ok(())
}