Add others/scaler.mjs

others/scaler.mjs

@@ -0,0 +1,37 @@
+import chokidar from "chokidar";
+import { LRUCache } from "lru-cache";
+import path from "path";
+
+let maxKeys = 10_000;
+let cache = makeCache(maxKeys);
+
+function makeCache(maxEntries) {
+  return new LRUCache({
+    maxSize: maxEntries,
+    ttl: 60_000,
+    allowStale: false,
+    updateAgeOnGet: false,
+    updateAgeOnHas: false
+  });
+}
+
+function scaleCache() {
+  const { heapUsed, heapTotal } = process.memoryUsage();
+  const freeHeapRatio = (heapTotal - heapUsed) / heapTotal;
+  const newMax = freeHeapRatio > 0.5 ? 20_000 : freeHeapRatio < 0.2 ? 5_000 : 10_000;
+  if (newMax !== maxKeys) {
+    maxKeys = newMax;
+    cache = makeCache(maxKeys);
+    console.log(`[SCALER] freeHeap ${((heapTotal - heapUsed) / 1e6).toFixed(1)}MB → maxKeys: ${maxKeys}`);
+  }
+}
+
+setInterval(scaleCache, 60_000);
+scaleCache();
+
+const watchPath = path.join(process.cwd(), "public");
+chokidar.watch(watchPath, { ignoreInitial: true }).on("all", () => {
+  cache.clear();
+});
+
+export { cache };