Refactorings/fixes for back-end

back_end/src/json_handlers.rs

@@ -10,9 +10,7 @@ pub fn handle_json(root: Value) -> Result<String, String> {
             "disconnect" => handle_disconnect(root),
             "request_board_state" => handle_request_board_state(root),
             "game_state" => handle_game_state(root),
-            _ => {
+            _ => Err("{\"type\":\"invalid_type\"}".into()),
-                Err("{\"type\":\"invalid_type\"}".into())
-            }
         }
     } else {
         Err("{\"type\":\"invalid_json\"}".into())

back_end/src/main.rs

@@ -9,16 +9,8 @@ async fn main() {
         .and(warp::body::json())
         .map(|json_value: Value| {
             let result = json_handlers::handle_json(json_value);
-            if let Ok(result_str) = result {
+            result.unwrap_or_else(|e| e)
-                result_str
-            } else if let Err(error_str) = result {
-                error_str
-            } else {
-                unreachable!()
-            }
         });
 
-    warp::serve(route)
+    warp::serve(route).run(([0, 0, 0, 0], 1237)).await;
-        .run(([0,0,0,0], 1237))
-        .await;
 }