tokio_read_write.rs

tokio_read_write.rs

use tokio::io::{AsyncReadExt, AsyncWriteExt};
use tokio::net::TcpListener;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let listener = TcpListener::bind("127.0.0.1:8080").await?;
    println!("Echo server listening on 127.0.0.1:8080");

    loop {
        let (mut socket, addr) = listener.accept().await?;
        println!("Accepted connection from: {}", addr);

        tokio::spawn(async move {
            let mut buf = vec![0; 1024];

            loop {
                match socket.read(&mut buf).await {
                    // Return value of `Ok(0)` signifies that the remote has closed
                    Ok(0) => return,
                    Ok(n) => {
                        // Write the data back
                        if socket.write_all(&buf[..n]).await.is_err() {
                            // We probably encountered a broken pipe.
                            break;
                        }
                    }
                    Err(e) => {
                        eprintln!("failed to read from socket; err = {:?}", e);
                        return;
                    }
                }
            }
        });
    }
}

https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=8224f5ce34421887d1b5b012e62d20cd

https://gist.github.com/RandyMcMillan/8224f5ce34421887d1b5b012e62d20cd