From 212b5a93209741c091d2f504f3d2edac8ae98262 Mon Sep 17 00:00:00 2001
From: Carl Worth <cworth@cworth.org>
Date: Fri, 29 May 2020 20:55:30 -0700
Subject: [PATCH] tictactoe: Replay previous moves when a new client connects

This fixes the bug where a client would join a game in progress but
would see only the blank board.
---
 tictactoe.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tictactoe.js b/tictactoe.js
index 79d7350..6d4b014 100644
--- a/tictactoe.js
+++ b/tictactoe.js
@@ -27,6 +27,15 @@ class TicTacToe extends Game {
   broadcast_move(square) {
     this.broadcast_event("move", square);
   }
+
+  handle_events(request, response) {
+    super.handle_events(request, response);
+
+    /* When a new client joins, replay all previous moves to it. */
+    for (let move of this.moves) {
+      response.write(`event: move\ndata: ${move}\n\n`);
+    }
+  }
 }
 
 router.get('/', (request, response) => {
-- 
2.43.0