package booking
import (
"time"
stdprometheus "github.com/prometheus/client_golang/prometheus"
"github.com/go-kit/kit/metrics"
kitprometheus "github.com/go-kit/kit/metrics/prometheus"
"github.com/go-kit/kit/examples/shipping/cargo"
"github.com/go-kit/kit/examples/shipping/location"
)
type instrumentingService struct {
requestCount metrics.Counter
requestLatency metrics.TimeHistogram
Service
}
// NewInstrumentingService returns an instance of an instrumenting Service.
func NewInstrumentingService(s Service) Service {
fieldKeys := []string{"method"}
requestCount := kitprometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "api",
Subsystem: "booking_service",
Name: "request_count",
Help: "Number of requests received.",
}, fieldKeys)
requestLatency := metrics.NewTimeHistogram(time.Microsecond, kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "api",
Subsystem: "booking_service",
Name: "request_latency_microseconds",
Help: "Total duration of requests in microseconds.",
}, fieldKeys))
return &instrumentingService{
requestCount: requestCount,
requestLatency: requestLatency,
Service: s,
}
}
func (s *instrumentingService) BookNewCargo(origin, destination location.UNLocode, arrivalDeadline time.Time) (cargo.TrackingID, error) {
defer func(begin time.Time) {
methodField := metrics.Field{Key: "method", Value: "book"}
s.requestCount.With(methodField).Add(1)
s.requestLatency.With(methodField).Observe(time.Since(begin))
}(time.Now())
return s.Service.BookNewCargo(origin, destination, arrivalDeadline)
}
func (s *instrumentingService) LoadCargo(id cargo.TrackingID) (c Cargo, err error) {
defer func(begin time.Time) {
methodField := metrics.Field{Key: "method", Value: "load"}
s.requestCount.With(methodField).Add(1)
s.requestLatency.With(methodField).Observe(time.Since(begin))
}(time.Now())
return s.Service.LoadCargo(id)
}
func (s *instrumentingService) RequestPossibleRoutesForCargo(id cargo.TrackingID) []cargo.Itinerary {
defer func(begin time.Time) {
methodField := metrics.Field{Key: "method", Value: "request_routes"}
s.requestCount.With(methodField).Add(1)
s.requestLatency.With(methodField).Observe(time.Since(begin))
}(time.Now())
return s.Service.RequestPossibleRoutesForCargo(id)
}
func (s *instrumentingService) AssignCargoToRoute(id cargo.TrackingID, itinerary cargo.Itinerary) (err error) {
defer func(begin time.Time) {
methodField := metrics.Field{Key: "method", Value: "assign_to_route"}
s.requestCount.With(methodField).Add(1)
s.requestLatency.With(methodField).Observe(time.Since(begin))
}(time.Now())
return s.Service.AssignCargoToRoute(id, itinerary)
}
func (s *instrumentingService) ChangeDestination(id cargo.TrackingID, l location.UNLocode) (err error) {
defer func(begin time.Time) {
methodField := metrics.Field{Key: "method", Value: "change_destination"}
s.requestCount.With(methodField).Add(1)
s.requestLatency.With(methodField).Observe(time.Since(begin))
}(time.Now())
return s.Service.ChangeDestination(id, l)
}
func (s *instrumentingService) Cargos() []Cargo {
defer func(begin time.Time) {
methodField := metrics.Field{Key: "method", Value: "list_cargos"}
s.requestCount.With(methodField).Add(1)
s.requestLatency.With(methodField).Observe(time.Since(begin))
}(time.Now())
return s.Service.Cargos()
}
func (s *instrumentingService) Locations() []Location {
defer func(begin time.Time) {
methodField := metrics.Field{Key: "method", Value: "list_locations"}
s.requestCount.With(methodField).Add(1)
s.requestLatency.With(methodField).Observe(time.Since(begin))
}(time.Now())
return s.Service.Locations()
}