fix #2 handle error instead of unwrap

src/openflow/tcp_listener.rs

@@ -14,20 +14,21 @@ pub fn tcp_listener_handler<OME: OfpMsgEvent>(address: &str, ofp_version: u8) {
             Ok(mut stream) => {
                 let controller_clone = controller.clone();
                 thread::spawn(move || {
-                    controller_clone
-                        .lock()
-                        .unwrap()
-                        .send_msg(HelloEvent::new(), 0, &mut stream);
-                    let ofp_size = controller_clone.lock().unwrap().get_ofp().header_size();
+                    let mut ctrl = match controller_clone.lock() {
+                        Ok(guard) => guard,
+                        Err(poinsoned) => {
+                            let guard = poinsoned.into_inner();
+                            guard
+                        }
+                    };
+                    ctrl.send_msg(HelloEvent::new(), 0, &mut stream);
+                    let ofp_size = ctrl.get_ofp().header_size();
                     // let ofp = controller.lock().unwrap().get_ofp();
                     let mut buffer = vec![0u8; ofp_size];
                     loop {
                         match stream.read(&mut buffer) {
                             Ok(v) if v > 0 => {
-                                controller_clone
-                                    .lock()
-                                    .unwrap()
-                                    .request_handler(&mut buffer, &mut stream);
+                                ctrl.request_handler(&mut buffer, &mut stream);
                             }
                             Ok(_) | Err(_) => break,
                         }