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metrics.go
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/
metrics.go
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package setup
import (
"fmt"
"github.com/qdm12/dns/v2/pkg/metrics/prometheus"
metricsmiddleware "github.com/qdm12/dns/v2/pkg/middlewares/metrics"
noopmetrics "github.com/qdm12/dns/v2/pkg/middlewares/metrics/noop"
prometheusmetrics "github.com/qdm12/dns/v2/pkg/middlewares/metrics/prometheus"
)
func middlewareMetrics(metricsType string,
commonPrometheus prometheus.Settings) (
middleware *metricsmiddleware.Middleware, err error) {
var metrics interface {
RequestsInc()
QuestionsInc(class, qType string)
RcodeInc(rcode string)
AnswersInc(class, qType string)
ResponsesInc()
InFlightRequestsInc()
InFlightRequestsDec()
}
switch metricsType {
case noopString:
metrics = noopmetrics.New()
case prometheusString:
promSettings := prometheusmetrics.Settings{
Prometheus: commonPrometheus,
}
metrics, err = prometheusmetrics.New(promSettings)
if err != nil {
return nil, fmt.Errorf("prometheus metrics: %w", err)
}
default:
panic(fmt.Sprintf("unknown metrics type: %s", metricsType))
}
settings := metricsmiddleware.Settings{
Metrics: metrics,
}
return metricsmiddleware.New(settings)
}