add saverooms logging

server/server.ts

@@ -630,27 +630,39 @@ app.use('/*splat', (_req, res) => {
   );
 });
 
-function saveRooms() {
+async function saveRooms() {
   // Unload rooms that are empty and idle
   // Frees up some JS memory space when process is long-running
   // On reconnect, we'll attempt to reload the room
-  rooms.forEach(async (room, key) => {
-    if (
-      room.roster.length === 0 &&
-      !room.vBrowser &&
-      Number(room.lastUpdateTime) < Date.now() - 24 * 60 * 60 * 1000
-    ) {
-      console.log('freeing room %s from memory on shard %s', key, config.SHARD);
-      await room.saveRoom();
-      room.destroy();
-      rooms.delete(key);
-      // Unregister the namespace to avoid dupes on reload
-      io._nsps.delete(key);
-    } else if (room.roster.length) {
-      room.lastUpdateTime = new Date();
-      await room.saveRoom();
-    }
-  });
+  let saveCount = 0;
+  const start = Date.now();
+  await Promise.all(
+    Array.from(rooms.entries()).map(async ([key, room]) => {
+      if (
+        room.roster.length === 0 &&
+        !room.vBrowser &&
+        Number(room.lastUpdateTime) < Date.now() - 24 * 60 * 60 * 1000
+      ) {
+        console.log(
+          'freeing room %s from memory on shard %s',
+          key,
+          config.SHARD,
+        );
+        await room.saveRoom();
+        room.destroy();
+        rooms.delete(key);
+        saveCount += 1;
+        // Unregister the namespace to avoid dupes on reload
+        io._nsps.delete(key);
+      } else if (room.roster.length) {
+        room.lastUpdateTime = new Date();
+        await room.saveRoom();
+        saveCount += 1;
+      }
+    }),
+  );
+  const end = Date.now();
+  console.log('[SAVEROOMS] %s saved in %sms', saveCount, end - start);
 }
 
 async function release() {