ws only computes game state if events since last time

cmd/server/ws.go

@@ -90,6 +90,7 @@ func (s *S) serveWS(w http.ResponseWriter, r *http.Request) error {
 		}
 	}()
 
+	var last time.Time
 	for {
 		select {
 		case <-ctx.Done():
@@ -97,6 +98,13 @@ func (s *S) serveWS(w http.ResponseWriter, r *http.Request) error {
 		case <-time.After(time.Second * 1):
 		}
 
+		if events, err := s.games.GameEvents(ctx, game, last); err != nil {
+			return err
+		} else if len(events) == 0 {
+			continue
+		}
+		last = time.Now()
+
 		gameState, err := s.games.GameState(ctx, game)
 		if err != nil {
 			return err