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package tracking
import (
type instrumentingService struct {
requestCount metrics.Counter
requestLatency metrics.Histogram
// NewInstrumentingService returns an instance of an instrumenting Service.
func NewInstrumentingService(counter metrics.Counter, latency metrics.Histogram, s Service) Service {
return &instrumentingService{
requestCount: counter,
requestLatency: latency,
Service: s,
func (s *instrumentingService) Track(id string) (Cargo, error) {
defer func(begin time.Time) {
s.requestCount.With("method", "track").Add(1)
s.requestLatency.With("method", "track").Observe(time.Since(begin).Seconds())
return s.Service.Track(id)
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