add dashboard

dashboard/server/services/PerformanceService.ts

@@ -0,0 +1,36 @@
+
+
+
+class PerformanceThing {
+    public min: number = Infinity;
+    public max: number = -Infinity;
+    private things: number[] = [];
+    private slice: number = 0;
+    constructor(public id: string, private maxThings: number) { }
+    start() { this.slice = performance.now(); }
+    stop() {
+        const time = performance.now() - this.slice;
+        if (time > this.max) this.max = time;
+        if (time < this.min) this.min = time;
+        this.things.push(time);
+        if (this.things.length > this.maxThings) {
+            this.things.shift();
+        }
+        return time;
+    }
+    avg() {
+        return this.things.reduce((a, e) => a + e, 0) / this.things.length;
+    }
+
+    print() {
+        console.log(`${this.id} | Avg: ${this.avg().toFixed(0)} ms | Min: ${this.min.toFixed(0)} ms | Max: ${this.max.toFixed(0)} ms`)
+    }
+    get data() { return this.things; }
+}
+
+export class PerformanceService {
+    static create(id: string, maxThings: number = 100) {
+        const thing = new PerformanceThing(id, maxThings);
+        return thing;
+    }
+}