MVP, no mod tools or anything but it works

vendor/gopkg.in/hlandau/easymetric.v1/cexp/cexp.go

@@ -0,0 +1,97 @@
+package cexp
+
+import "gopkg.in/hlandau/measurable.v1"
+import "sync/atomic"
+
+// Counter
+
+type Counter struct {
+	name  string
+	value int64
+}
+
+func (c *Counter) MsName() string {
+	return c.name
+}
+
+func (c *Counter) MsInt64() int64 {
+	return atomic.LoadInt64(&c.value)
+}
+
+func (c *Counter) Get() int64 {
+	return c.MsInt64()
+}
+
+// v must be non-negative.
+func (c *Counter) Add(v int64) {
+	atomic.AddInt64(&c.value, v)
+}
+
+func (c *Counter) Inc() {
+	c.Add(1)
+}
+
+func (c *Counter) MsType() measurable.Type {
+	return measurable.CounterType
+}
+
+func NewCounter(name string) *Counter {
+	c := &Counter{
+		name: name,
+	}
+
+	measurable.Register(c)
+	return c
+}
+
+// Gauge
+
+type Gauge struct {
+	name  string
+	value int64
+}
+
+func (c *Gauge) MsName() string {
+	return c.name
+}
+
+func (c *Gauge) MsInt64() int64 {
+	return atomic.LoadInt64(&c.value)
+}
+
+func (c *Gauge) Add(v int64) {
+	atomic.AddInt64(&c.value, v)
+}
+
+func (c *Gauge) Sub(v int64) {
+	c.Add(-v)
+}
+
+func (c *Gauge) Set(v int64) {
+	atomic.StoreInt64(&c.value, v)
+}
+
+func (c *Gauge) Get() int64 {
+	return c.MsInt64()
+}
+
+func (c *Gauge) Inc() {
+	c.Add(1)
+}
+
+func (c *Gauge) Dec() {
+	c.Add(-1)
+}
+
+func (c *Gauge) MsType() measurable.Type {
+	return measurable.GaugeType
+}
+
+func NewGauge(name string) *Gauge {
+	c := &Gauge{
+		name: name,
+	}
+
+	measurable.Register(c)
+	return c
+}