should be good to extend functionality now

src/proxy/tcp.rs

@@ -0,0 +1,26 @@
+use std::sync::Arc;
+use tokio::io;
+use tokio::net::TcpStream;
+use anywho::Error;
+use crate::backend::Backend;
+use crate::proxy::ConnectionContext;
+
+pub async fn proxy_tcp_connection(connection_id: u64, mut client_stream: TcpStream, backend: Arc<Backend>) -> Result<(), Error> {
+    let client_addr = client_stream.peer_addr()?;
+
+    let mut ctx = ConnectionContext::new(connection_id, client_addr, backend.clone());
+
+    #[cfg(debug_assertions)]
+    println!("info: conn_id={} connecting to {}", connection_id, ctx.backend.id);
+
+    let mut backend_stream = TcpStream::connect(&backend.address).await?;
+
+    let (tx, rx) = io::copy_bidirectional(
+        &mut client_stream,
+        &mut backend_stream,
+    ).await?;
+
+    ctx.bytes_transferred = tx + rx;
+
+    Ok(())
+}