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package metrics
import "github.com/prometheus/client_golang/prometheus"
// Counter is a metrics that can only increment its current count
type Counter interface {
// Inc adds Sum(vs) to the counter. Sum(vs) must be positive.
//
// If len(vs) == 0, increments the counter by 1.
Inc(vs ...float64)
}
// LabeledCounter is counter that must have labels populated before use.
type LabeledCounter interface {
WithValues(vs ...string) Counter
}
type labeledCounter struct {
pc *prometheus.CounterVec
}
func (lc *labeledCounter) WithValues(vs ...string) Counter {
return &counter{pc: lc.pc.WithLabelValues(vs...)}
}
func (lc *labeledCounter) Describe(ch chan<- *prometheus.Desc) {
lc.pc.Describe(ch)
}
func (lc *labeledCounter) Collect(ch chan<- prometheus.Metric) {
lc.pc.Collect(ch)
}
type counter struct {
pc prometheus.Counter
}
func (c *counter) Inc(vs ...float64) {
if len(vs) == 0 {
c.pc.Inc()
}
c.pc.Add(sumFloat64(vs...))
}
func (c *counter) Describe(ch chan<- *prometheus.Desc) {
c.pc.Describe(ch)
}
func (c *counter) Collect(ch chan<- prometheus.Metric) {
c.pc.Collect(ch)
}
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