Implement Some Tokio Tutorials

Tutorial/EchoCopy.rs

@@ -0,0 +1,21 @@
+#![allow(non_snake_case)]
+
+use tokio::io;
+use tokio::net::TcpListener;
+
+#[tokio::main]
+async fn main() -> io::Result<()> {
+    let mut listener = TcpListener::bind("127.0.0.1:6142").await.unwrap();
+
+    loop {
+        let (mut socket, _) = listener.accept().await?;
+
+        tokio::spawn(async move {
+            let (mut rd, mut wr) = socket.split();
+
+            if io::copy(&mut rd, &mut wr).await.is_err() {
+                eprintln!("failed to copy");
+            }
+        });
+    }
+}