[feat] Create Metrics from JS

js/lib/speedboat/metrics.js

@@ -0,0 +1,40 @@
+export let CounterType = 1;
+export let GaugeType = 2;
+export let TrendType = 3;
+
+export class Metric {
+	constructor(t, name) {
+		if (!__initapi__) {
+			throw new Error("Metrics can only be created during the init phase");
+		}
+		this._impl = __initapi__.NewMetric(t, name);
+	}
+}
+
+export class Counter extends Metric {
+	constructor(name) {
+		super(CounterType, name);
+	}
+}
+
+export class Gauge extends Metric {
+	constructor(name) {
+		super(GaugeType, name);
+	}
+}
+
+export class Trend extends Metric {
+	constructor(name) {
+		super(TrendType, name);
+	}
+}
+
+export default {
+	CounterType: CounterType,
+	GaugeType: GaugeType,
+	TrendType: TrendType,
+	Metric: Metric,
+	Counter: Counter,
+	Gauge: Gauge,
+	Trend: Trend,
+}

js/runtime.go

@@ -27,6 +27,7 @@ type Runtime struct {
 	VM      *otto.Otto
 	Root    string
 	Exports map[string]otto.Value
+	Metrics map[string]*stats.Metric
 
 	lib map[string]otto.Value
 }
@@ -41,6 +42,7 @@ func New() (*Runtime, error) {
 		VM:      otto.New(),
 		Root:    wd,
 		Exports: make(map[string]otto.Value),
+		Metrics: make(map[string]*stats.Metric),
 		lib:     make(map[string]otto.Value),
 	}