feat: initial counter

src/lib/routes/client-api/request-counter.ts

@@ -0,0 +1,47 @@
+datefns;
+
+export default class RequestCounter {
+    private requestCache: Object;
+    private longTermCache: Object;
+    private interval: number;
+
+    constructor() {
+        this.requestCache = {};
+        this.longTermCache = [];
+
+        this.interval = setInterval(() => {
+            this.requestCache.endTime = new Date();
+
+            const longTermCacheObject = {
+                ...this.requestCache,
+                rps: this.calculateRPS(),
+            };
+
+            this.longTermCache.push(longTermCacheObject);
+
+            this.requestCache = this.createBucket();
+        }, 300000).unref();
+    }
+
+    createBucket = () => {
+        const bucket = {
+            count: 0,
+            startTime: new Date(),
+            endTime: null,
+        };
+        return bucket;
+    };
+
+    recordRequest = (appName: string): Promise<void> => {
+        if (this.requestCache[appName]) {
+            this.requestCache[count] += 1;
+        } else {
+            this.requestCache[appName] = { count: 1 };
+        }
+    };
+
+    calculateRPS = () => {
+        const { count } = this.requestCache;
+        return count / 300;
+    };
+}