Stop wasting CPU cycles on infinite loops

src/main.rs

@@ -13,8 +13,10 @@ async fn main() -> anyhow::Result<()> {
 
     let ports: HashMap<SocketAddr, u16> = toml::from_str(&contents)?;
 
+    let mut handles = Vec::with_capacity(ports.len());
+
     for (&saddr, &port) in &ports {
-        tokio::spawn(async move {
+        let handle = tokio::spawn(async move {
             let listener = TcpListener::bind(SocketAddr::new("0.0.0.0".parse()?, port)).await?;
             loop {
                 let (stream, _) = listener.accept().await?;
@@ -30,10 +32,15 @@ async fn main() -> anyhow::Result<()> {
             #[allow(unreachable_code)]
             Ok::<(), anyhow::Error>(())
         });
+
+        handles.push(handle);
     }
 
-    #[allow(clippy::empty_loop)]
-    loop {}
+    for handle in handles {
+        handle.await??;
+    }
+
+    Ok(())
 }
 
 async fn proxy(left: TcpStream, right: TcpStream) -> anyhow::Result<()> {