add rate limiting

serve.ts

@@ -8,19 +8,42 @@ import { sleep } from "https://deno.land/x/[email protected]/mod.ts";
 //   throw new Error("Function not implemented.");
 // }
 
-const kv = await Deno.openKv();
-
 const server = new Server({
   port: 8000,
   root: `${Deno.cwd()}/_site`,
 });
 
-// Rate limiting
-server.use(async (request, next) => {
+// Rate limiting (max 10 requests per 10 seconds)
+const maxRequests = 10;
+const interval = 10000;
+const rateLimitter = {
+  requestCount: 0,
+  lastResetTime: Date.now(),
+};
+
+server.use(async (request, next, _conn) => {
   const response = await next(request);
 
-  await sleep(2);
-
+  // const remoteAddr = conn.remoteAddr;
+
+  const currentTime = Date.now();
+
+  // Reset rateLimitter after elapsing interval
+  if (currentTime - rateLimitter.lastResetTime > interval) {
+    rateLimitter.requestCount = 0;
+    rateLimitter.lastResetTime = currentTime;
+  }
+
+  // Rate limiting
+  if (rateLimitter.requestCount < maxRequests) {
+    rateLimitter.requestCount += 1;
+  } else {
+    console.log("Rate limiting: Sleep 30 seconds.");
+    await sleep(30);
+  }
+
+  await sleep(1);
+
   return response;
 })