Bugs fixing attempt

[xogo.git] / server.js

diff --git a/server.js b/server.js
index 0382e37..7e1a99b 100644 (file)
--- a/server.js
+++ b/server.js
@@ -7,6 +7,7 @@ const wss = new WebSocket.Server({
 
 let challenges = {}; //variantName --> socketId, name
 let games = {}; //gameId --> gameInfo (vname, fen, players, options, time)
+let moveHash = {}; //gameId --> set of hashes seen so far
 let sockets = {}; //socketId --> socket
 const variants = require("./variants.js");
 const Crypto = require("crypto");
@@ -34,6 +35,7 @@ function initializeGame(vname, players, options) {
 
 // Provide seed in case of, so that both players initialize with same FEN
 function launchGame(gid) {
+  moveHash[gid] = {};
   const gameInfo = Object.assign(
     {seed: Math.floor(Math.random() * 1984), gid: gid},
     games[gid]
@@ -193,6 +195,13 @@ wss.on("connection", (socket, req) => {
         break;
       // Relay a move + update games object
       case "newmove":
+        // NOTE: still potential racing issues, but... fingers crossed
+        const hash = Crypto.createHash("md5")
+                     .update(JSON.stringify(obj.fen))
+                     .digest("hex");
+        if (moveHash[hash])
+          break;
+        moveHash[hash] = true;
         games[obj.gid].fen = obj.fen;
         games[obj.gid].time = Date.now(); //update timestamp in case of
         const playingWhite = (games[obj.gid].players[0].sid == sid);