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service.go
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service.go
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// Package booking provides the use-case of booking a cargo. Used by views
// facing an administrator.
package booking
import (
"errors"
"time"
"github.com/go-kit/kit/examples/shipping/cargo"
"github.com/go-kit/kit/examples/shipping/location"
"github.com/go-kit/kit/examples/shipping/routing"
)
// ErrInvalidArgument is returned when one or more arguments are invalid.
var ErrInvalidArgument = errors.New("invalid argument")
// Service is the interface that provides booking methods.
type Service interface {
// BookNewCargo registers a new cargo in the tracking system, not yet
// routed.
BookNewCargo(origin location.UNLocode, destination location.UNLocode, deadline time.Time) (cargo.TrackingID, error)
// LoadCargo returns a read model of a cargo.
LoadCargo(id cargo.TrackingID) (Cargo, error)
// RequestPossibleRoutesForCargo requests a list of itineraries describing
// possible routes for this cargo.
RequestPossibleRoutesForCargo(id cargo.TrackingID) []cargo.Itinerary
// AssignCargoToRoute assigns a cargo to the route specified by the
// itinerary.
AssignCargoToRoute(id cargo.TrackingID, itinerary cargo.Itinerary) error
// ChangeDestination changes the destination of a cargo.
ChangeDestination(id cargo.TrackingID, destination location.UNLocode) error
// Cargos returns a list of all cargos that have been booked.
Cargos() []Cargo
// Locations returns a list of registered locations.
Locations() []Location
}
type service struct {
cargos cargo.Repository
locations location.Repository
handlingEvents cargo.HandlingEventRepository
routingService routing.Service
}
func (s *service) AssignCargoToRoute(id cargo.TrackingID, itinerary cargo.Itinerary) error {
if id == "" || len(itinerary.Legs) == 0 {
return ErrInvalidArgument
}
c, err := s.cargos.Find(id)
if err != nil {
return err
}
c.AssignToRoute(itinerary)
return s.cargos.Store(c)
}
func (s *service) BookNewCargo(origin, destination location.UNLocode, deadline time.Time) (cargo.TrackingID, error) {
if origin == "" || destination == "" || deadline.IsZero() {
return "", ErrInvalidArgument
}
id := cargo.NextTrackingID()
rs := cargo.RouteSpecification{
Origin: origin,
Destination: destination,
ArrivalDeadline: deadline,
}
c := cargo.New(id, rs)
if err := s.cargos.Store(c); err != nil {
return "", err
}
return c.TrackingID, nil
}
func (s *service) LoadCargo(id cargo.TrackingID) (Cargo, error) {
if id == "" {
return Cargo{}, ErrInvalidArgument
}
c, err := s.cargos.Find(id)
if err != nil {
return Cargo{}, err
}
return assemble(c, s.handlingEvents), nil
}
func (s *service) ChangeDestination(id cargo.TrackingID, destination location.UNLocode) error {
if id == "" || destination == "" {
return ErrInvalidArgument
}
c, err := s.cargos.Find(id)
if err != nil {
return err
}
l, err := s.locations.Find(destination)
if err != nil {
return err
}
c.SpecifyNewRoute(cargo.RouteSpecification{
Origin: c.Origin,
Destination: l.UNLocode,
ArrivalDeadline: c.RouteSpecification.ArrivalDeadline,
})
if err := s.cargos.Store(c); err != nil {
return err
}
return nil
}
func (s *service) RequestPossibleRoutesForCargo(id cargo.TrackingID) []cargo.Itinerary {
if id == "" {
return nil
}
c, err := s.cargos.Find(id)
if err != nil {
return []cargo.Itinerary{}
}
return s.routingService.FetchRoutesForSpecification(c.RouteSpecification)
}
func (s *service) Cargos() []Cargo {
var result []Cargo
for _, c := range s.cargos.FindAll() {
result = append(result, assemble(c, s.handlingEvents))
}
return result
}
func (s *service) Locations() []Location {
var result []Location
for _, v := range s.locations.FindAll() {
result = append(result, Location{
UNLocode: string(v.UNLocode),
Name: v.Name,
})
}
return result
}
// NewService creates a booking service with necessary dependencies.
func NewService(cargos cargo.Repository, locations location.Repository, events cargo.HandlingEventRepository, rs routing.Service) Service {
return &service{
cargos: cargos,
locations: locations,
handlingEvents: events,
routingService: rs,
}
}
// Location is a read model for booking views.
type Location struct {
UNLocode string `json:"locode"`
Name string `json:"name"`
}
// Cargo is a read model for booking views.
type Cargo struct {
ArrivalDeadline time.Time `json:"arrival_deadline"`
Destination string `json:"destination"`
Legs []cargo.Leg `json:"legs,omitempty"`
Misrouted bool `json:"misrouted"`
Origin string `json:"origin"`
Routed bool `json:"routed"`
TrackingID string `json:"tracking_id"`
}
func assemble(c *cargo.Cargo, events cargo.HandlingEventRepository) Cargo {
return Cargo{
TrackingID: string(c.TrackingID),
Origin: string(c.Origin),
Destination: string(c.RouteSpecification.Destination),
Misrouted: c.Delivery.RoutingStatus == cargo.Misrouted,
Routed: !c.Itinerary.IsEmpty(),
ArrivalDeadline: c.RouteSpecification.ArrivalDeadline,
Legs: c.Itinerary.Legs,
}
}