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// Package prometheus provides Prometheus implementations for metrics.
// Individual metrics are mapped to their Prometheus counterparts, and
// (depending on the constructor used) may be automatically registered in the
// global Prometheus metrics registry.
package prometheus
import (
"github.com/prometheus/client_golang/prometheus"
"github.com/go-kit/kit/metrics"
"github.com/go-kit/kit/metrics/internal/lv"
)
// Counter implements Counter, via a Prometheus CounterVec.
type Counter struct {
cv *prometheus.CounterVec
lvs lv.LabelValues
}
// NewCounterFrom constructs and registers a Prometheus CounterVec,
// and returns a usable Counter object.
func NewCounterFrom(opts prometheus.CounterOpts, labelNames []string) *Counter {
cv := prometheus.NewCounterVec(opts, labelNames)
prometheus.MustRegister(cv)
return NewCounter(cv)
}
// NewCounter wraps the CounterVec and returns a usable Counter object.
func NewCounter(cv *prometheus.CounterVec) *Counter {
return &Counter{
cv: cv,
}
}
// With implements Counter.
func (c *Counter) With(labelValues ...string) metrics.Counter {
return &Counter{
cv: c.cv,
lvs: c.lvs.With(labelValues...),
}
}
// Add implements Counter.
func (c *Counter) Add(delta float64) {
c.cv.With(makeLabels(c.lvs...)).Add(delta)
}
// Gauge implements Gauge, via a Prometheus GaugeVec.
type Gauge struct {
gv *prometheus.GaugeVec
lvs lv.LabelValues
}
// 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 {
return &Gauge{
gv: gv,
}
}
// With implements Gauge.
func (g *Gauge) With(labelValues ...string) metrics.Gauge {
return &Gauge{
gv: g.gv,
lvs: g.lvs.With(labelValues...),
}
}
// Set implements Gauge.
func (g *Gauge) Set(value float64) {
g.gv.With(makeLabels(g.lvs...)).Set(value)
}
// Add is supported by Prometheus GaugeVecs.
func (g *Gauge) Add(delta float64) {
g.gv.With(makeLabels(g.lvs...)).Add(delta)
}
// Summary implements Histogram, via a Prometheus SummaryVec. The difference
// between a Summary and a Histogram is that Summaries don't require predefined
// quantile buckets, but cannot be statistically aggregated.
type Summary struct {
sv *prometheus.SummaryVec
lvs lv.LabelValues
}
// NewSummaryFrom constructs and registers a Prometheus SummaryVec,
// and returns a usable Summary object.
func NewSummaryFrom(opts prometheus.SummaryOpts, labelNames []string) *Summary {
sv := prometheus.NewSummaryVec(opts, labelNames)
prometheus.MustRegister(sv)
return NewSummary(sv)
}
// NewSummary wraps the SummaryVec and returns a usable Summary object.
func NewSummary(sv *prometheus.SummaryVec) *Summary {
return &Summary{
sv: sv,
}
}
// With implements Histogram.
func (s *Summary) With(labelValues ...string) metrics.Histogram {
return &Summary{
sv: s.sv,
lvs: s.lvs.With(labelValues...),
}
}
// Observe implements Histogram.
func (s *Summary) Observe(value float64) {
s.sv.With(makeLabels(s.lvs...)).Observe(value)
}
// Histogram implements Histogram via a Prometheus HistogramVec. The difference
// between a Histogram and a Summary is that Histograms require predefined
// quantile buckets, and can be statistically aggregated.
type Histogram struct {
hv *prometheus.HistogramVec
lvs lv.LabelValues
}
// NewHistogramFrom constructs and registers a Prometheus HistogramVec,
// and returns a usable Histogram object.
func NewHistogramFrom(opts prometheus.HistogramOpts, labelNames []string) *Histogram {
hv := prometheus.NewHistogramVec(opts, labelNames)
prometheus.MustRegister(hv)
return NewHistogram(hv)
}
// NewHistogram wraps the HistogramVec and returns a usable Histogram object.
func NewHistogram(hv *prometheus.HistogramVec) *Histogram {
return &Histogram{
hv: hv,
}
}
// With implements Histogram.
func (h *Histogram) With(labelValues ...string) metrics.Histogram {
return &Histogram{
hv: h.hv,
lvs: h.lvs.With(labelValues...),
}
}
// Observe implements Histogram.
func (h *Histogram) Observe(value float64) {
h.hv.With(makeLabels(h.lvs...)).Observe(value)
}
func makeLabels(labelValues ...string) prometheus.Labels {
labels := prometheus.Labels{}
for i := 0; i < len(labelValues); i += 2 {
labels[labelValues[i]] = labelValues[i+1]
}
return labels
}
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