update

cmd/backoffice/main.go

@@ -94,7 +94,7 @@ func main() {
 
 	_ = os.MkdirAll(dataDir, 0755)
 
-	reg := cart.NewCartMultationRegistry()
+	reg := cart.NewCartMultationRegistry(nil)
 	diskStorage := actor.NewDiskStorage[cart.CartGrain](dataDir, reg)
 
 	fs := NewFileServer(dataDir, diskStorage)

pkg/cart/cart-mutation-helper.go

@@ -1,21 +1,56 @@
 package cart
 
 import (
+	"context"
+
 	"git.k6n.net/go-cart-actor/pkg/actor"
 	messages "git.k6n.net/go-cart-actor/pkg/messages"
+	"github.com/matst80/go-redis-inventory/pkg/inventory"
 )
 
-func NewCartMultationRegistry() actor.MutationRegistry {
+type CartMutationContext struct {
+	reservationService inventory.CartReservationService
+}
+
+func NewCartMutationContext(reservationService inventory.CartReservationService) CartMutationContext {
+	return CartMutationContext{
+		reservationService: reservationService,
+	}
+}
+
+func (c *CartMutationContext) ReserveItem(ctx context.Context, cartId CartId, sku string, locationId string, quantity int) error {
+	if quantity <= 0 || c.reservationService == nil {
+		return nil
+	}
+	return c.reservationService.ReserveForCart(ctx, inventory.CartReserveRequest{
+		CartID: inventory.CartID(cartId.String()),
+		InventoryReference: &inventory.InventoryReference{
+			SKU:        inventory.SKU(sku),
+			LocationID: inventory.LocationID(locationId),
+		},
+
+		Quantity: uint32(quantity),
+	})
+}
+
+func (c *CartMutationContext) ReleaseItem(ctx context.Context, cartId CartId, sku string, locationId string) error {
+	if c.reservationService == nil {
+		return nil
+	}
+	return c.reservationService.ReleaseForCart(ctx, inventory.SKU(sku), inventory.LocationID(locationId), inventory.CartID(cartId.String()))
+}
+
+func NewCartMultationRegistry(context *CartMutationContext) actor.MutationRegistry {
 
 	reg := actor.NewMutationRegistry()
 	reg.RegisterMutations(
-		actor.NewMutation(AddItem, func() *messages.AddItem {
+		actor.NewMutation(context.AddItem, func() *messages.AddItem {
 			return &messages.AddItem{}
 		}),
-		actor.NewMutation(ChangeQuantity, func() *messages.ChangeQuantity {
+		actor.NewMutation(context.ChangeQuantity, func() *messages.ChangeQuantity {
 			return &messages.ChangeQuantity{}
 		}),
-		actor.NewMutation(RemoveItem, func() *messages.RemoveItem {
+		actor.NewMutation(context.RemoveItem, func() *messages.RemoveItem {
 			return &messages.RemoveItem{}
 		}),
 		actor.NewMutation(InitializeCheckout, func() *messages.InitializeCheckout {
@@ -45,7 +80,7 @@ func NewCartMultationRegistry() actor.MutationRegistry {
 		actor.NewMutation(UpsertSubscriptionDetails, func() *messages.UpsertSubscriptionDetails {
 			return &messages.UpsertSubscriptionDetails{}
 		}),
-		actor.NewMutation(InventoryReserved, func() *messages.InventoryReserved {
+		actor.NewMutation(context.InventoryReserved, func() *messages.InventoryReserved {
 			return &messages.InventoryReserved{}
 		}),
 		actor.NewMutation(PreConditionFailed, func() *messages.PreConditionFailed {

pkg/cart/mutation_add_item.go

@@ -20,7 +20,7 @@ import (
 // NOTE: Any future field additions in messages.AddItem that affect pricing / tax
 // must keep this handler in sync.
 
-func AddItem(g *CartGrain, m *messages.AddItem) error {
+func (c *CartMutationContext) AddItem(g *CartGrain, m *messages.AddItem) error {
 	if m == nil {
 		return fmt.Errorf("AddItem: nil payload")
 	}

pkg/cart/mutation_change_quantity.go

@@ -26,7 +26,7 @@ import (
 //     (If strict locking is required around every mutation, wrap logic in
 //     an explicit g.mu.Lock()/Unlock(), but current model mirrors prior code.)
 
-func ChangeQuantity(g *CartGrain, m *messages.ChangeQuantity) error {
+func (c *CartMutationContext) ChangeQuantity(g *CartGrain, m *messages.ChangeQuantity) error {
 	if m == nil {
 		return fmt.Errorf("ChangeQuantity: nil payload")
 	}

pkg/cart/mutation_inventory_reserved.go

@@ -2,7 +2,7 @@ package cart
 
 import "git.k6n.net/go-cart-actor/pkg/messages"
 
-func InventoryReserved(g *CartGrain, m *messages.InventoryReserved) error {
+func (c *CartMutationContext) InventoryReserved(g *CartGrain, m *messages.InventoryReserved) error {
 	g.InventoryReserved = true
 	return nil
 }

pkg/cart/mutation_remove_item.go

@@ -22,7 +22,7 @@ import (
 //   - If multiple lines somehow shared the same Id (should not happen), only
 //     the first match would be removed—data integrity relies on unique line Ids.
 
-func RemoveItem(g *CartGrain, m *messages.RemoveItem) error {
+func (c *CartMutationContext) RemoveItem(g *CartGrain, m *messages.RemoveItem) error {
 	if m == nil {
 		return fmt.Errorf("RemoveItem: nil payload")
 	}

pkg/cart/mutation_test.go

@@ -11,6 +11,7 @@ import (
 	"time"
 
 	"github.com/gogo/protobuf/proto"
+	"github.com/matst80/go-redis-inventory/pkg/inventory"
 	"google.golang.org/protobuf/types/known/anypb"
 
 	"git.k6n.net/go-cart-actor/pkg/actor"
@@ -25,8 +26,28 @@ func newTestGrain() *CartGrain {
 	return NewCartGrain(123, time.Now())
 }
 
+type MockReservationService struct {
+}
+
+func (m *MockReservationService) ReserveForCart(ctx context.Context, req inventory.CartReserveRequest) error {
+	return nil
+}
+
+func (m *MockReservationService) ReleaseForCart(ctx context.Context, sku inventory.SKU, locationID inventory.LocationID, cartID inventory.CartID) error {
+	return nil
+}
+
+func (m *MockReservationService) GetAvailableInventory(ctx context.Context, sku inventory.SKU, locationID inventory.LocationID) (uint32, error) {
+	return 1000, nil
+}
+
 func newRegistry() actor.MutationRegistry {
-	return NewCartMultationRegistry()
+	cartCtx := &CartMutationContext{
+		reservationService: &MockReservationService{
+			reservations: []messages.Reservation{},
+		},
+	}
+	return NewCartMultationRegistry(cartCtx)
 }
 
 func msgAddItem(sku string, price int64, qty int32, storePtr *string) *messages.AddItem {