From b967bfc72c54ceafe800e44568aa4fa20fabd675 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor@ccxvii.net>
Date: Sun, 13 Feb 2022 13:14:04 +0100
Subject: Track and avoid sending no-op view changes to clients.

When state changes that cause no visible changes for a client, don't
bother sending a new view object.
---
 server.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/server.js b/server.js
index 1c8ebe8..2cc5cca 100644
--- a/server.js
+++ b/server.js
@@ -1648,7 +1648,11 @@ function send_state(socket, state) {
 		view.log = view.log.slice(view.log_start);
 		if (state.state === 'game_over')
 			view.game_over = 1;
-		send_message(socket, 'state', view);
+		view = JSON.stringify(['state', view]);
+		if (socket.last_view !== view) {
+			socket.send(view);
+			socket.last_view = view;
+		}
 	} catch (err) {
 		console.log(err);
 		return send_message(socket, 'error', err.toString());
-- 
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