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service.go
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service.go
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package types
import (
"context"
"errors"
"fmt"
"github.com/rainest/decklib/pkg/crud"
"github.com/rainest/decklib/pkg/state"
"github.com/kong/go-kong/kong"
)
// serviceCRUD implements crud.Actions interface.
type serviceCRUD struct {
client *kong.Client
}
func serviceFromStruct(arg crud.Event) *state.Service {
service, ok := arg.Obj.(*state.Service)
if !ok {
panic("unexpected type, expected *state.service")
}
return service
}
// Create creates a Service in Kong.
// The arg should be of type crud.Event, containing the service to be created,
// else the function will panic.
// It returns a the created *state.Service.
func (s *serviceCRUD) Create(ctx context.Context, arg ...crud.Arg) (crud.Arg, error) {
event := crud.EventFromArg(arg[0])
service := serviceFromStruct(event)
createdService, err := s.client.Services.Create(ctx, &service.Service)
if err != nil {
return nil, err
}
return &state.Service{Service: *createdService}, nil
}
// Delete deletes a Service in Kong.
// The arg should be of type crud.Event, containing the service to be deleted,
// else the function will panic.
// It returns a the deleted *state.Service.
func (s *serviceCRUD) Delete(ctx context.Context, arg ...crud.Arg) (crud.Arg, error) {
event := crud.EventFromArg(arg[0])
service := serviceFromStruct(event)
err := s.client.Services.Delete(ctx, service.ID)
if err != nil {
return nil, err
}
return service, nil
}
// Update updates a Service in Kong.
// The arg should be of type crud.Event, containing the service to be updated,
// else the function will panic.
// It returns a the updated *state.Service.
func (s *serviceCRUD) Update(ctx context.Context, arg ...crud.Arg) (crud.Arg, error) {
event := crud.EventFromArg(arg[0])
service := serviceFromStruct(event)
updatedService, err := s.client.Services.Create(ctx, &service.Service)
if err != nil {
return nil, err
}
return &state.Service{Service: *updatedService}, nil
}
type serviceDiffer struct {
kind crud.Kind
currentState, targetState *state.KongState
}
func (d *serviceDiffer) Deletes(handler func(crud.Event) error) error {
currentServices, err := d.currentState.Services.GetAll()
if err != nil {
return err
}
for _, service := range currentServices {
n, err := d.deleteService(service)
if err != nil {
return err
}
if n != nil {
err = handler(*n)
if err != nil {
return err
}
}
}
return nil
}
func (d *serviceDiffer) deleteService(service *state.Service) (*crud.Event, error) {
_, err := d.targetState.Services.Get(*service.ID)
if errors.Is(err, state.ErrNotFound) {
return &crud.Event{
Op: crud.Delete,
Kind: d.kind,
Obj: service,
}, nil
}
if err != nil {
return nil, fmt.Errorf("looking up service %q: %w",
service.FriendlyName(), err)
}
return nil, nil
}
func (d *serviceDiffer) CreateAndUpdates(handler func(crud.Event) error) error {
targetServices, err := d.targetState.Services.GetAll()
if err != nil {
return fmt.Errorf("error fetching services from state: %w", err)
}
for _, service := range targetServices {
n, err := d.createUpdateService(service)
if err != nil {
return err
}
if n != nil {
err = handler(*n)
if err != nil {
return err
}
}
}
return nil
}
func (d *serviceDiffer) createUpdateService(service *state.Service) (*crud.Event, error) {
serviceCopy := &state.Service{Service: *service.DeepCopy()}
currentService, err := d.currentState.Services.Get(*service.ID)
if errors.Is(err, state.ErrNotFound) {
return &crud.Event{
Op: crud.Create,
Kind: "service",
Obj: serviceCopy,
}, nil
}
if err != nil {
return nil, fmt.Errorf("error looking up service %q: %w",
*service.Name, err)
}
// found, check if update needed
if !currentService.EqualWithOpts(serviceCopy, false, true) {
return &crud.Event{
Op: crud.Update,
Kind: "service",
Obj: serviceCopy,
OldObj: currentService,
}, nil
}
return nil, nil
}
func (d *serviceDiffer) DuplicatesDeletes() ([]crud.Event, error) {
targetServices, err := d.targetState.Services.GetAll()
if err != nil {
return nil, fmt.Errorf("error fetching services from state: %w", err)
}
var events []crud.Event
for _, service := range targetServices {
serviceEvents, err := d.deleteDuplicateService(service)
if err != nil {
return nil, err
}
events = append(events, serviceEvents...)
}
return events, nil
}
func (d *serviceDiffer) deleteDuplicateService(targetService *state.Service) ([]crud.Event, error) {
if targetService == nil || targetService.Name == nil {
// Nothing to do, cannot be a duplicate with no name.
return nil, nil
}
currentService, err := d.currentState.Services.Get(*targetService.Name)
if errors.Is(err, state.ErrNotFound) {
return nil, nil
}
if err != nil {
return nil, fmt.Errorf("error looking up service %q: %w",
*targetService.Name, err)
}
if *currentService.ID != *targetService.ID {
var events []crud.Event
// We have to delete all routes beforehand as otherwise we will get a foreign key error when deleting the service
// as routes are not deleted by the cascading delete of the service.
// See https://github.com/Kong/kong/discussions/7314 for more details.
routesToDelete, err := d.currentState.Routes.GetAllByServiceID(*currentService.ID)
if err != nil {
return nil, fmt.Errorf("error looking up routes for service %q: %w",
*currentService.Name, err)
}
for _, route := range routesToDelete {
events = append(events, crud.Event{
Op: crud.Delete,
Kind: "route",
Obj: route,
})
}
return append(events, crud.Event{
Op: crud.Delete,
Kind: "service",
Obj: currentService,
}), nil
}
return nil, nil
}