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consumer.go
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consumer.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"
)
// consumerCRUD implements crud.Actions interface.
type consumerCRUD struct {
client *kong.Client
}
func consumerFromStruct(arg crud.Event) *state.Consumer {
consumer, ok := arg.Obj.(*state.Consumer)
if !ok {
panic("unexpected type, expected *state.consumer")
}
return consumer
}
// Create creates a Consumer in Kong.
// The arg should be of type crud.Event, containing the consumer to be created,
// else the function will panic.
// It returns a the created *state.Consumer.
func (s *consumerCRUD) Create(ctx context.Context, arg ...crud.Arg) (crud.Arg, error) {
event := crud.EventFromArg(arg[0])
consumer := consumerFromStruct(event)
createdConsumer, err := s.client.Consumers.Create(ctx, &consumer.Consumer)
if err != nil {
return nil, err
}
return &state.Consumer{Consumer: *createdConsumer}, nil
}
// Delete deletes a Consumer in Kong.
// The arg should be of type crud.Event, containing the consumer to be deleted,
// else the function will panic.
// It returns a the deleted *state.Consumer.
func (s *consumerCRUD) Delete(ctx context.Context, arg ...crud.Arg) (crud.Arg, error) {
event := crud.EventFromArg(arg[0])
consumer := consumerFromStruct(event)
err := s.client.Consumers.Delete(ctx, consumer.ID)
if err != nil {
return nil, err
}
return consumer, nil
}
// Update updates a Consumer in Kong.
// The arg should be of type crud.Event, containing the consumer to be updated,
// else the function will panic.
// It returns a the updated *state.Consumer.
func (s *consumerCRUD) Update(ctx context.Context, arg ...crud.Arg) (crud.Arg, error) {
event := crud.EventFromArg(arg[0])
consumer := consumerFromStruct(event)
updatedConsumer, err := s.client.Consumers.Create(ctx, &consumer.Consumer)
if err != nil {
return nil, err
}
return &state.Consumer{Consumer: *updatedConsumer}, nil
}
type consumerDiffer struct {
kind crud.Kind
currentState, targetState *state.KongState
}
func (d *consumerDiffer) Deletes(handler func(crud.Event) error) error {
currentConsumers, err := d.currentState.Consumers.GetAll()
if err != nil {
return fmt.Errorf("error fetching consumers from state: %w", err)
}
for _, consumer := range currentConsumers {
n, err := d.deleteConsumer(consumer)
if err != nil {
return err
}
if n != nil {
err = handler(*n)
if err != nil {
return err
}
}
}
return nil
}
func (d *consumerDiffer) deleteConsumer(consumer *state.Consumer) (*crud.Event, error) {
_, err := d.targetState.Consumers.GetByIDOrUsername(*consumer.ID)
if errors.Is(err, state.ErrNotFound) {
return &crud.Event{
Op: crud.Delete,
Kind: d.kind,
Obj: consumer,
}, nil
}
if err != nil {
return nil, fmt.Errorf("looking up consumer %q: %w",
consumer.FriendlyName(), err)
}
return nil, nil
}
func (d *consumerDiffer) CreateAndUpdates(handler func(crud.Event) error) error {
targetConsumers, err := d.targetState.Consumers.GetAll()
if err != nil {
return fmt.Errorf("error fetching consumers from state: %w", err)
}
for _, consumer := range targetConsumers {
n, err := d.createUpdateConsumer(consumer)
if err != nil {
return err
}
if n != nil {
err = handler(*n)
if err != nil {
return err
}
}
}
return nil
}
func (d *consumerDiffer) createUpdateConsumer(consumer *state.Consumer) (*crud.Event, error) {
consumerCopy := &state.Consumer{Consumer: *consumer.DeepCopy()}
currentConsumer, err := d.currentState.Consumers.GetByIDOrUsername(*consumer.ID)
if errors.Is(err, state.ErrNotFound) {
// consumer not present, create it
return &crud.Event{
Op: crud.Create,
Kind: d.kind,
Obj: consumerCopy,
}, nil
}
if err != nil {
return nil, fmt.Errorf("error looking up consumer %q: %w",
consumer.FriendlyName(), err)
}
// found, check if update needed
if !currentConsumer.EqualWithOpts(consumerCopy, false, true) {
return &crud.Event{
Op: crud.Update,
Kind: d.kind,
Obj: consumerCopy,
OldObj: currentConsumer,
}, nil
}
return nil, nil
}
func (d *consumerDiffer) DuplicatesDeletes() ([]crud.Event, error) {
targetConsumers, err := d.targetState.Consumers.GetAll()
if err != nil {
return nil, fmt.Errorf("error fetching consumers from state: %w", err)
}
var events []crud.Event
for _, targetConsumer := range targetConsumers {
event, err := d.deleteDuplicateConsumer(targetConsumer)
if err != nil {
return nil, err
}
if event != nil {
events = append(events, *event)
}
}
return events, nil
}
func (d *consumerDiffer) deleteDuplicateConsumer(targetConsumer *state.Consumer) (*crud.Event, error) {
var (
idOrUsername string
currentConsumer *state.Consumer
err error
)
if targetConsumer.Username != nil {
idOrUsername = *targetConsumer.Username
} else if targetConsumer.ID != nil {
idOrUsername = *targetConsumer.ID
}
if idOrUsername != "" {
currentConsumer, err = d.currentState.Consumers.GetByIDOrUsername(idOrUsername)
}
if errors.Is(err, state.ErrNotFound) || idOrUsername == "" {
if targetConsumer.CustomID != nil {
currentConsumer, err = d.currentState.Consumers.GetByCustomID(*targetConsumer.CustomID)
if errors.Is(err, state.ErrNotFound) {
return nil, nil
}
if err != nil {
return nil, fmt.Errorf("error looking up consumer by custom_id %q: %w",
*targetConsumer.Username, err)
}
} else {
return nil, nil
}
}
if err != nil {
return nil, fmt.Errorf("error looking up consumer by username or id %q: %w",
*targetConsumer.Username, err)
}
if *currentConsumer.ID != *targetConsumer.ID {
return &crud.Event{
Op: crud.Delete,
Kind: "consumer",
Obj: currentConsumer,
}, nil
}
return nil, nil
}