feat: merged repos

src/main.rs

@@ -1,7 +1,7 @@
 mod netutils;
 
 use anywho::Error;
-use netutils::{Backend, proxy, proxy_connection};
+use netutils::{Backend, tunnel};
 use std::sync::Arc;
 
 use tokio::net::TcpListener;
@@ -16,32 +16,26 @@ async fn main() -> Result<(), Error> {
 
     let current_index = Arc::new(Mutex::new(0));
 
-    println!("lb starting on 0.0.0.0:8080");
+    println!("enginewhy starting on 0.0.0.0:8080");
     println!("backends: {:?}", backends);
 
     let listener = TcpListener::bind("0.0.0.0:8080").await?;
 
     loop {
-        let (socket, addr) = listener.accept().await?;
+        let (client, addr) = listener.accept().await?;
         println!("info: new connection from {}", addr);
 
-        let backends_clone = backends.clone();
-        let index_clone = current_index.clone();
-
-        tokio::spawn(async move {
-            // Round Robin
         let backend = {
-                let mut index = index_clone.lock().await;
-                let selected_backend = backends_clone[*index].clone();
-                *index = (*index + 1) % backends_clone.len();
+            let mut index = current_index.lock().await;
+            let selected_backend = backends[*index].clone();
+            *index = (*index + 1) % backends.len();
             selected_backend
         };
 
         println!("info: routing client {} to backend {}", addr, backend);
 
-            if let Err(e) = proxy_connection(socket, &backend).await {
+        if let Err(e) = tunnel(client, backend).await {
             eprintln!("error: proxy failed for {}: {}", addr, e);
         }
-        });
     }
 }

src/netutils.rs

@@ -1,6 +1,6 @@
 use std::fmt;
 use tokio::io;
-use tokio::net::{TcpListener, TcpStream};
+use tokio::net::TcpStream;
 
 use std::error::Error;
 
@@ -21,57 +21,43 @@ impl fmt::Display for Backend {
     }
 }
 
-pub async fn proxy(client_addr: String, server_addr: String) -> Result<(), Box<dyn Error>> {
-    let listener = TcpListener::bind(client_addr.clone()).await?;
-    println!("Opened {client_addr} -> {server_addr}");
-    loop {
-        let server_addr = server_addr.clone();
-        let (client, _) = listener.accept().await?;
+pub async fn tunnel(client_stream: TcpStream, backend: Backend) -> Result<(), Box<dyn Error>> {
+    let backend_address: String = backend.address.clone();
     tokio::spawn(async move {
-            let server = TcpStream::connect(server_addr).await.unwrap();
-
-            let (mut read_client, mut write_client) = client.into_split();
-            let (mut read_server, mut write_server) = server.into_split();
-
-            let forward_to_server =
-                tokio::spawn(async move { io::copy(&mut read_client, &mut write_server).await });
-
-            let forward_to_client =
-                tokio::spawn(async move { io::copy(&mut read_server, &mut write_client).await });
-
-            let _ = tokio::join!(forward_to_server, forward_to_client);
-        });
+        let backend_stream: TcpStream = match TcpStream::connect(&backend_address).await {
+            Ok(s) => {
+                println!("Connected to backend {backend_address}");
+                s
+            }
+            Err(e) => {
+                eprintln!("Failed connecting to backend {backend_address}: {e}");
+                return;
             }
-}
-
-pub async fn proxy_connection(
-    client_stream: TcpStream,
-    backend: &Backend,
-) -> Result<(), io::Error> {
-    let log_error = |e| {
-        eprintln!("error: something went wrong {}", e);
-        e
         };
 
-    println!("info: connecting to backend {}", backend);
-    let backend_stream = TcpStream::connect(&backend.address)
+        let (mut read_client, mut write_client) = client_stream.into_split();
+        let (mut read_backend, mut write_backend) = backend_stream.into_split();
+
+        let client_to_backend = tokio::spawn(async move {
+            match io::copy(&mut read_client, &mut write_backend)
                 .await
-        .map_err(log_error)?;
-    println!(
-        "info: the bluetooth device is connected successfully {}",
-        backend
-    );
+                .unwrap()
+            {
+                n => println!("{n}B ==> backend"),
+            }
+        });
 
-    let (mut client_read, mut client_write) = client_stream.into_split();
-    let (mut backend_read, mut backend_write) = backend_stream.into_split();
+        let backend_to_client = tokio::spawn(async move {
+            match io::copy(&mut read_backend, &mut write_client)
+                .await
+                .unwrap()
+            {
+                n => println!("{n}B ==> client"),
+            }
+        });
 
-    let client_to_backend = io::copy(&mut client_read, &mut backend_write);
-    let backend_to_client = io::copy(&mut backend_read, &mut client_write);
-
-    let _ = tokio::select! {
-        res_a = client_to_backend => res_a.map_err(log_error)?,
-        res_b = backend_to_client => res_b.map_err(log_error)?,
-    };
+        let _ = tokio::join!(client_to_backend, backend_to_client);
+    });
 
     Ok(())
 }