79 lines
2.4 KiB
Go
79 lines
2.4 KiB
Go
package metrics
|
|
|
|
import (
|
|
"github.com/go-kit/kit/metrics"
|
|
"github.com/go-kit/kit/metrics/multi"
|
|
)
|
|
|
|
// Registry has to implemented by any system that wants to monitor and expose metrics.
|
|
type Registry interface {
|
|
// IsEnabled shows whether metrics instrumentation is enabled.
|
|
IsEnabled() bool
|
|
ReqsCounter() metrics.Counter
|
|
ReqDurationHistogram() metrics.Histogram
|
|
RetriesCounter() metrics.Counter
|
|
}
|
|
|
|
// NewMultiRegistry creates a new standardRegistry that wraps multiple Registries.
|
|
func NewMultiRegistry(registries []Registry) Registry {
|
|
reqsCounters := []metrics.Counter{}
|
|
reqDurationHistograms := []metrics.Histogram{}
|
|
retriesCounters := []metrics.Counter{}
|
|
|
|
for _, r := range registries {
|
|
reqsCounters = append(reqsCounters, r.ReqsCounter())
|
|
reqDurationHistograms = append(reqDurationHistograms, r.ReqDurationHistogram())
|
|
retriesCounters = append(retriesCounters, r.RetriesCounter())
|
|
}
|
|
|
|
return &standardRegistry{
|
|
enabled: true,
|
|
reqsCounter: multi.NewCounter(reqsCounters...),
|
|
reqDurationHistogram: multi.NewHistogram(reqDurationHistograms...),
|
|
retriesCounter: multi.NewCounter(retriesCounters...),
|
|
}
|
|
}
|
|
|
|
type standardRegistry struct {
|
|
enabled bool
|
|
reqsCounter metrics.Counter
|
|
reqDurationHistogram metrics.Histogram
|
|
retriesCounter metrics.Counter
|
|
}
|
|
|
|
func (r *standardRegistry) IsEnabled() bool {
|
|
return r.enabled
|
|
}
|
|
|
|
func (r *standardRegistry) ReqsCounter() metrics.Counter {
|
|
return r.reqsCounter
|
|
}
|
|
|
|
func (r *standardRegistry) ReqDurationHistogram() metrics.Histogram {
|
|
return r.reqDurationHistogram
|
|
}
|
|
|
|
func (r *standardRegistry) RetriesCounter() metrics.Counter {
|
|
return r.retriesCounter
|
|
}
|
|
|
|
// NewVoidRegistry is a noop implementation of metrics.Registry.
|
|
// It is used to avoid nil checking in components that do metric collections.
|
|
func NewVoidRegistry() Registry {
|
|
return &standardRegistry{
|
|
enabled: false,
|
|
reqsCounter: &voidCounter{},
|
|
reqDurationHistogram: &voidHistogram{},
|
|
retriesCounter: &voidCounter{},
|
|
}
|
|
}
|
|
|
|
type voidCounter struct{}
|
|
|
|
func (v *voidCounter) With(labelValues ...string) metrics.Counter { return v }
|
|
func (v *voidCounter) Add(delta float64) {}
|
|
|
|
type voidHistogram struct{}
|
|
|
|
func (h *voidHistogram) With(labelValues ...string) metrics.Histogram { return h }
|
|
func (h *voidHistogram) Observe(value float64) {}
|