48 lines
949 B
Go
48 lines
949 B
Go
|
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.
|
||
|
|
func NewGauge(name string, f func() float64) *Gauge {
|
||
|
|
g := &Gauge{
|
||
|
|
f: f,
|
||
|
|
}
|
||
|
|
registerMetric(name, g)
|
||
|
|
return g
|
||
|
|
}
|
||
|
|
|
||
|
|
// Gauge is a float64 gauge.
|
||
|
|
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 notations
|
||
|
|
fmt.Fprintf(w, "%s %d\n", prefix, int64(v))
|
||
|
|
} else {
|
||
|
|
fmt.Fprintf(w, "%s %g\n", prefix, v)
|
||
|
|
}
|
||
|
|
}
|