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gauge.go
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gauge.go
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package fastmetrics
import (
"github.com/go-kit/kit/metrics"
"github.com/prometheus/client_golang/prometheus"
)
// Gauge implements Gauge, via a Prometheus GaugeVec.
type Gauge struct {
gv *prometheus.GaugeVec
lvs LabelValues
labels prometheus.Labels
g prometheus.Gauge
}
// NewGaugeFrom constructs and registers a Prometheus GaugeVec,
// and returns a usable Gauge object.
func NewGaugeFrom(opts prometheus.GaugeOpts, labelNames []string) *Gauge {
gv := prometheus.NewGaugeVec(opts, labelNames)
prometheus.MustRegister(gv)
return NewGauge(gv)
}
// NewGauge wraps the GaugeVec and returns a usable Gauge object.
func NewGauge(gv *prometheus.GaugeVec) *Gauge {
gauge := &Gauge{
gv: gv,
}
gauge.labels = makeLabels(gauge.lvs...)
gauge.g, _ = gauge.gv.GetMetricWith(gauge.labels)
return gauge
}
// With implements Gauge.
func (g *Gauge) With(labelValues ...string) metrics.Gauge {
gauge := &Gauge{
gv: g.gv,
lvs: g.lvs.With(labelValues...),
}
gauge.labels = makeLabels(gauge.lvs...)
gauge.g, _ = gauge.gv.GetMetricWith(gauge.labels)
return gauge
}
// Set implements Gauge.
func (g *Gauge) Set(value float64) {
if g.g != nil {
g.g.Set(value)
} else {
g.gv.With(g.labels).Set(value)
}
}
// Add is supported by Prometheus GaugeVecs.
func (g *Gauge) Add(delta float64) {
if g.g != nil {
g.g.Add(delta)
} else {
g.gv.With(g.labels).Add(delta)
}
}