refactor(server): implement request handlers as methods

moved request handling logic into dedicated methods on the request handler struct for better organization and readability. this includes handlers for ping, list games, get game info, and invalid requests. game file data handler is added but not yet implemented.

crates/lanspread-server/src/req.rs

@@ -44,14 +44,16 @@ impl RequestHandler {
         Ok(())
     }
 
-    pub(crate) async fn process_request(&self, request: Request, games_folder: &Path) -> Response {
-        match request {
-            Request::Ping => Response::Pong,
-            Request::ListGames => {
+    fn handle_ping() -> Response {
+        Response::Pong
+    }
+
+    async fn handle_list_games(&self) -> Response {
         let db = self.db.read().await;
         Response::ListGames(db.all_games().into_iter().cloned().collect())
     }
-            Request::GetGame { id } => {
+
+    async fn handle_get_game(&self, id: String, games_folder: &Path) -> Response {
         if self.db.read().await.get_game_by_id(&id).is_none() {
             tracing::error!("Game not found in DB: {id}");
             return Response::GameNotFound(id);
@@ -97,10 +99,22 @@ impl RequestHandler {
             file_descriptions: game_files_descs,
         }
     }
-            Request::GetGameFileData(_) => {
+
+    fn handle_get_game_file_data(&self) -> Response {
         Response::InvalidRequest(Bytes::new(), "Not implemented".to_string())
     }
-            Request::Invalid(data, err_msg) => Response::InvalidRequest(data, err_msg),
+
+    fn handle_invalid(&self, data: Bytes, err_msg: String) -> Response {
+        Response::InvalidRequest(data, err_msg)
+    }
+
+    pub(crate) async fn process_request(&self, request: Request, games_folder: &Path) -> Response {
+        match request {
+            Request::Ping => RequestHandler::handle_ping(),
+            Request::ListGames => self.handle_list_games().await,
+            Request::GetGame { id } => self.handle_get_game(id, games_folder).await,
+            Request::GetGameFileData(_) => self.handle_get_game_file_data(),
+            Request::Invalid(data, err_msg) => self.handle_invalid(data, err_msg),
         }
     }
 }