echoserver 0.1.0

Echo Server
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use std::net::SocketAddr;
use std::sync::Arc;

use anyhow::Result;
use tokio::net::UdpSocket;
use tracing::{error, info, instrument};

#[instrument(skip_all, fields(
    local_addr=socket.local_addr().unwrap().to_string(),
    remote_addr=remote_addr.to_string(),
))]
async fn handle(socket: Arc<UdpSocket>, remote_addr: SocketAddr, data: &[u8]) -> Result<()> {
    info!("Read {} bytes, writing back", data.len());
    socket.send_to(data, remote_addr).await?;
    Ok(())
}

pub async fn serve(addr: SocketAddr) -> Result<()> {
    info!("Serving UDP on {}", addr);

    let socket = Arc::new(
        UdpSocket::bind(addr)
            .await
            .expect(&format!("bind TCP server on {addr}")),
    );

    loop {
        let mut buf = [0; 2048];
        match socket.recv_from(&mut buf).await {
            Ok((n, remote_addr)) => {
                handle(socket.clone(), remote_addr, &buf[0..n])
                    .await
                    .expect(&format!("echo data from UDP server {addr}"));
            }
            Err(e) => {
                error!("Failed to receive data: {}", e);
            }
        }
    }
}