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| 1 | +use std::{error::Error, net::SocketAddr}; |
| 2 | +use tokio::{ |
| 3 | + io::{AsyncReadExt, AsyncWriteExt}, |
| 4 | + net::{TcpListener, ToSocketAddrs, UdpSocket}, |
| 5 | +}; |
| 6 | + |
| 7 | +/// Simple echo server. |
| 8 | +#[derive(clap::Parser, Debug, Clone, PartialEq, Eq)] |
| 9 | +#[command(author, version, about = "Simple echo server.", long_about = None)] |
| 10 | +pub struct CmdOpt { |
| 11 | + /// Echo server listen address. |
| 12 | + #[clap(short, long, value_name = "address:port", default_value = "127.0.0.1:8080")] |
| 13 | + listen_addr: SocketAddr, |
| 14 | + |
| 15 | + /// timeout for TCP connection |
| 16 | + #[clap(short, long, value_name = "seconds", default_value = "10")] |
| 17 | + tcp_timeout: u64, |
| 18 | +} |
| 19 | + |
| 20 | +async fn tcp_main<A: ToSocketAddrs>(addr: A, tcp_timeout: u64) -> std::io::Result<()> { |
| 21 | + let listener = TcpListener::bind(addr).await?; |
| 22 | + log::info!("[TCP] listening on: {}", listener.local_addr()?); |
| 23 | + loop { |
| 24 | + let (mut socket, peer) = listener.accept().await?; |
| 25 | + tokio::spawn(async move { |
| 26 | + let block = async move { |
| 27 | + let mut buf = vec![0; 1024]; |
| 28 | + log::info!("[TCP] incoming peer {}", peer); |
| 29 | + loop { |
| 30 | + let duration = std::time::Duration::from_secs(tcp_timeout); |
| 31 | + let n = tokio::time::timeout(duration, socket.read(&mut buf)).await??; |
| 32 | + if n == 0 { |
| 33 | + log::info!("[TCP] {} exit", peer); |
| 34 | + break; |
| 35 | + } |
| 36 | + let amt = socket.write(&buf[0..n]).await?; |
| 37 | + log::info!("[TCP] Echoed {}/{} bytes to {}", amt, n, peer); |
| 38 | + } |
| 39 | + Ok::<(), std::io::Error>(()) |
| 40 | + }; |
| 41 | + if let Err(err) = block.await { |
| 42 | + log::info!("[TCP] {}", err); |
| 43 | + } |
| 44 | + }); |
| 45 | + } |
| 46 | +} |
| 47 | + |
| 48 | +async fn udp_main<A: ToSocketAddrs>(addr: A) -> std::io::Result<()> { |
| 49 | + let socket = UdpSocket::bind(&addr).await?; |
| 50 | + log::info!("[UDP] Listening on: {}", socket.local_addr()?); |
| 51 | + |
| 52 | + let mut buf = vec![0; 1024]; |
| 53 | + let mut to_send = None; |
| 54 | + |
| 55 | + loop { |
| 56 | + if let Some((size, peer)) = to_send { |
| 57 | + let amt = socket.send_to(&buf[..size], &peer).await?; |
| 58 | + log::info!("[UDP] Echoed {}/{} bytes to {}", amt, size, peer); |
| 59 | + } |
| 60 | + |
| 61 | + to_send = Some(socket.recv_from(&mut buf).await?); |
| 62 | + } |
| 63 | +} |
| 64 | + |
| 65 | +#[tokio::main] |
| 66 | +async fn main() -> Result<(), Box<dyn Error + Send + Sync + 'static>> { |
| 67 | + let opt: CmdOpt = clap::Parser::parse(); |
| 68 | + |
| 69 | + env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("trace")).init(); |
| 70 | + |
| 71 | + let addr = opt.listen_addr; |
| 72 | + let _tcp = tokio::spawn(async move { |
| 73 | + tcp_main(&addr, opt.tcp_timeout).await?; |
| 74 | + Ok::<(), std::io::Error>(()) |
| 75 | + }); |
| 76 | + |
| 77 | + let _udp = tokio::spawn(async move { |
| 78 | + udp_main(&addr).await?; |
| 79 | + Ok::<(), std::io::Error>(()) |
| 80 | + }); |
| 81 | + |
| 82 | + let (tx, mut rx) = tokio::sync::mpsc::channel::<()>(1); |
| 83 | + |
| 84 | + ctrlc2::set_async_handler(async move { |
| 85 | + tx.send(()).await.unwrap(); |
| 86 | + log::info!("Ctrl-C received, shutting down..."); |
| 87 | + }) |
| 88 | + .await; |
| 89 | + |
| 90 | + rx.recv().await.unwrap(); |
| 91 | + log::info!("Exiting..."); |
| 92 | + |
| 93 | + Ok(()) |
| 94 | +} |
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