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package metrics
import (
"fmt"
"io"
)
// NewGauge registers and returns gauge with the given name, which calls f
// to obtain gauge value.
//
// name must be valid Prometheus-compatible metric with possible labels.
// For instance,
//
// - foo
// - foo{bar="baz"}
// - foo{bar="baz",aaa="b"}
//
// f must be safe for concurrent calls.
//
// The returned gauge is safe to use from concurrent goroutines.
//
// See also FloatCounter for working with floating-point values.
func NewGauge(name string, f func() float64) *Gauge {
return defaultSet.NewGauge(name, f)
}
// Gauge is a float64 gauge.
//
// See also Counter, which could be used as a gauge with Set and Dec calls.
type Gauge struct {
f func() float64
}
// Get returns the current value for g.
func (g *Gauge) Get() float64 {
return g.f()
}
func (g *Gauge) marshalTo(prefix string, w io.Writer) {
v := g.f()
if float64(int64(v)) == v {
// Marshal integer values without scientific notation
fmt.Fprintf(w, "%s %d\n", prefix, int64(v))
} else {
fmt.Fprintf(w, "%s %g\n", prefix, v)
}
}
// GetOrCreateGauge returns registered gauge with the given name
// or creates new gauge if the registry doesn't contain gauge 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 gauge is safe to use from concurrent goroutines.
//
// Performance tip: prefer NewGauge instead of GetOrCreateGauge.
//
// See also FloatCounter for working with floating-point values.
func GetOrCreateGauge(name string, f func() float64) *Gauge {
return defaultSet.GetOrCreateGauge(name, f)
}
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