Add vendoring

vendor/github.com/VictoriaMetrics/metrics/counter.go

@@ -0,0 +1,86 @@
+package metrics
+
+import (
+	"fmt"
+	"io"
+	"sync/atomic"
+)
+
+// NewCounter registers and returns new counter with the given name.
+//
+// name must be valid Prometheus-compatible metric with possible labels.
+// For instance,
+//
+//   - foo
+//   - foo{bar="baz"}
+//   - foo{bar="baz",aaa="b"}
+//
+// The returned counter is safe to use from concurrent goroutines.
+func NewCounter(name string) *Counter {
+	return defaultSet.NewCounter(name)
+}
+
+// Counter is a counter.
+//
+// It may be used as a gauge if Dec and Set are called.
+type Counter struct {
+	n uint64
+}
+
+// Inc increments c.
+func (c *Counter) Inc() {
+	atomic.AddUint64(&c.n, 1)
+}
+
+// Dec decrements c.
+func (c *Counter) Dec() {
+	atomic.AddUint64(&c.n, ^uint64(0))
+}
+
+// Add adds n to c.
+func (c *Counter) Add(n int) {
+	atomic.AddUint64(&c.n, uint64(n))
+}
+
+// AddInt64 adds n to c.
+func (c *Counter) AddInt64(n int64) {
+	atomic.AddUint64(&c.n, uint64(n))
+}
+
+// Get returns the current value for c.
+func (c *Counter) Get() uint64 {
+	return atomic.LoadUint64(&c.n)
+}
+
+// Set sets c value to n.
+func (c *Counter) Set(n uint64) {
+	atomic.StoreUint64(&c.n, n)
+}
+
+// marshalTo marshals c with the given prefix to w.
+func (c *Counter) marshalTo(prefix string, w io.Writer) {
+	v := c.Get()
+	fmt.Fprintf(w, "%s %d\n", prefix, v)
+}
+
+func (c *Counter) metricType() string {
+	return "counter"
+}
+
+// GetOrCreateCounter returns registered counter with the given name
+// or creates new counter if the registry doesn't contain counter with
+// the given name.
+//
+// name must be valid Prometheus-compatible metric with possible labels.
+// For instance,
+//
+//   - foo
+//   - foo{bar="baz"}
+//   - foo{bar="baz",aaa="b"}
+//
+// The returned counter is safe to use from concurrent goroutines.
+//
+// Performance tip: prefer NewCounter instead of GetOrCreateCounter.
+func GetOrCreateCounter(name string) *Counter {
+	return defaultSet.GetOrCreateCounter(name)
+}