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feat(metrics): Add getters #462

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25 changes: 25 additions & 0 deletions pkg/api/prometheus/prometheus.go
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@ import (
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/client_golang/prometheus/promhttp"
io_prometheus_client "github.com/prometheus/client_model/go"
)

const (
Expand Down Expand Up @@ -60,6 +61,30 @@ func (p *PrometheusAPI) HandleRequest(w http.ResponseWriter, r *http.Request) {

var registered map[string]interface{}

// Get current value of a Counter metric
func GetCounter(name string) *float64 {
if _, ok := registered[name]; ok {
m := io_prometheus_client.Metric{}
registered[name].(prometheus.Counter).Write(&m)
return m.Counter.Value
}
return nil
}

// Get current value of an Average metric
func GetAverage(name string) *float64 {
if _, ok := registered[name]; ok {
m := io_prometheus_client.Metric{}
registered[name].(prometheus.Histogram).Write(&m)
if m.Histogram.SampleSum != nil && m.Histogram.SampleCountFloat != nil {
average := *m.Histogram.SampleSum / *m.Histogram.SampleCountFloat
return &average
}
return nil
}
return nil
}

// Increment will increment the counter.
func Increment(name string) {
if _, ok := registered[name]; ok {
Expand Down