tcp_listener: move controller variable into thread -> for multi switch

src/openflow/tcp_listener.rs

 use crate::Controller;
-use std::sync::{Arc, Mutex};
 use std::{io::Read, net::TcpListener, thread};
 
 use super::controller_frame::ControllerFrame;
 use crate::openflow::ofp10::{traiter::OfpMsgEvent, HelloEvent};
 
 pub fn tcp_listener_handler<OME: OfpMsgEvent>(address: &str) {
-    let controller = Arc::new(Mutex::from(Controller::new()));
     let listener = TcpListener::bind(address).unwrap();
     for stream in listener.incoming() {
         match stream {
             Ok(mut stream) => {
-                let controller_clone = controller.clone();
+                if let Ok(addr) = stream.local_addr() {
+                    println!("server has connection from {}", addr);
+                }
+
                 thread::spawn(move || {
-                    let mut ctrl = match controller_clone.lock() {
-                        Ok(guard) => guard,
-                        Err(poinsoned) => {
-                            let guard = poinsoned.into_inner();
-                            guard
-                        }
-                    };
+                    let mut ctrl = Controller::new();
                     ctrl.send_msg(HelloEvent::new(), 0, &mut stream);
                     let ofp_size = ctrl.get_ofp().header_size();
                     // let ofp = controller.lock().unwrap().get_ofp();
@@ -29,7 +24,10 @@ pub fn tcp_listener_handler<OME: OfpMsgEvent>(address: &str) {
                             Ok(v) if v > 0 => {
                                 ctrl.request_handler(&mut buffer, &mut stream);
                             }
-                            Ok(_) | Err(_) => break,
+                            Ok(_) | Err(_) => {
+                                println!("cannot read packet");
+                                break;
+                            }
                         }
                     }
                 });