Add per-connection state and async handlers

src/main.rs

@@ -1,40 +1,103 @@
 use std::io;
+use std::net::SocketAddr;
+use std::sync::atomic::{AtomicU64, Ordering};
 
 use tokio::io::{AsyncReadExt, AsyncWriteExt};
 use tokio::net::{TcpListener, TcpStream};
 
+static NEXT_CONNECTION_ID: AtomicU64 = AtomicU64::new(1);
+
 #[tokio::main]
 async fn main() -> io::Result<()> {
     let listener = TcpListener::bind("192.168.1.152:32768").await?;
 
-    println!("Сервер слушает 127.0.0.1:32768");
+    println!("Сервер слушает 192.168.1.152:32768");
 
     loop {
         let (stream, client_addr) = listener.accept().await?;
 
-        println!("Подключился клиент: {}", client_addr);
+        let connection_id =
+            NEXT_CONNECTION_ID.fetch_add(1, Ordering::Relaxed);
+
+        let connection = Connection::new(
+            connection_id,
+            client_addr,
+            stream,
+        );
 
         tokio::spawn(async move {
-            if let Err(error) = handle_client(stream).await {
-                eprintln!("Ошибка клиента {client_addr}: {error}");
+            if let Err(error) = connection.run().await {
+                eprintln!(
+                    "Обработчик {connection_id}: ошибка: {error}"
+                );
             }
-            println!("Клиент {client_addr} отключился");
         });
     }
 }
 
-async fn handle_client(mut stream:TcpStream) -> io::Result<()> {
-    let mut buffer = [0_u8; 3];
+struct Connection {
+    id: u64,
+    client_addr: SocketAddr,
+    stream: TcpStream,
+    message_count: u64,
+}
+
+impl Connection {
+    fn new(
+        id: u64,
+        client_addr: SocketAddr,
+        stream: TcpStream,
+    ) -> Self {
+        Self {
+            id,
+            client_addr,
+            stream,
+            message_count: 0,
+        }
+    }
+
+    async fn run(mut self) -> io::Result<()> {
+        println!(
+            "Обработчик {} создан для {}",
+            self.id,
+            self.client_addr
+        );
+
+        let mut buffer = [0_u8; 1024];
+
         loop {
-        let bytes_read = stream.read(&mut buffer).await?;
+            let bytes_read = self.stream.read(&mut buffer).await?;
 
             if bytes_read == 0 {
+                println!(
+                    "Обработчик {}: клиент {} отключился",
+                    self.id,
+                    self.client_addr
+                );
+
                 return Ok(());
             }
 
-        println!("получено {bytes_read} байт {:?}", String::from_utf8_lossy(&buffer[..bytes_read]));
+            self.message_count += 1;
 
-        stream.write_all(&buffer[..bytes_read]).await?;
-    }
+            let received =
+                String::from_utf8_lossy(&buffer[..bytes_read]);
 
+            println!(
+                "Обработчик {}: сообщение №{}: {:?}",
+                self.id,
+                self.message_count,
+                received
+            );
+
+            let response = format!(
+                "Обработчик {}: сообщение №{}: {}\n",
+                self.id,
+                self.message_count,
+                received
+            );
+
+            self.stream.write_all(response.as_bytes()).await?;
+        }
+    }
 }