add interfaces to retrieve cached data without a new request

js/pacosako_io.js

@@ -106,6 +106,18 @@ function onGameUpdate(gameId, callback) {
    }
 }
 
+function getCachedGame(gameId) {
+   if (gameId in games) {
+      return JSON.stringify(games[gameId].data);
+   } else {
+      return undefined;
+   }
+}
+
+function getCachedMeta() {
+   return JSON.parse(JSON.stringify(meta.games));
+}
+
 function onMetaUpdate(callback) {
    if (Object.keys(meta.listeners).length === 0) {
       startMetaPoll(meta.lastModified);
@@ -403,6 +415,8 @@ module.exports = {
    getGameMeta,
    onGameUpdate,
    onMetaUpdate,
+   getCachedGame,
+   getCachedMeta,
    sendUpdate,
    getConnectionState,
    onConnectionStateChanged,