initial inventory service

cmd/inventory/main.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/redis/go-redis/v9"
+	"github.com/redis/go-redis/v9/maintnotifications"
+)
+
+func main() {
+	var ctx = context.Background()
+	rdb := redis.NewClient(&redis.Options{
+		Addr:     "10.10.3.18:6379",
+		Password: "slaskredis", // no password set
+		DB:       0,            // use default DB
+		MaintNotificationsConfig: &maintnotifications.Config{
+			Mode: maintnotifications.ModeDisabled,
+		},
+	})
+
+	err := rdb.Set(ctx, "key", "value", 0).Err()
+	if err != nil {
+		panic(err)
+	}
+
+	val, err := rdb.Get(ctx, "key").Result()
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("key", val)
+
+	val2, err := rdb.Get(ctx, "key2").Result()
+	if err == redis.Nil {
+		fmt.Println("key2 does not exist")
+	} else if err != nil {
+		panic(err)
+	} else {
+		fmt.Println("key2", val2)
+	}
+}

go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/matst80/slask-finder v0.0.0-20251023104024-f788e5a51d68
 	github.com/prometheus/client_golang v1.23.2
 	github.com/rabbitmq/amqp091-go v1.10.0
+	github.com/redis/go-redis/v9 v9.16.0
 	google.golang.org/grpc v1.76.0
 	google.golang.org/protobuf v1.36.10
 	k8s.io/api v0.34.1
@@ -21,6 +22,7 @@ require (
 	github.com/bits-and-blooms/bitset v1.24.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
+	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/dprotaso/go-yit v0.0.0-20220510233725-9ba8df137936 // indirect
 	github.com/emicklei/go-restful/v3 v3.13.0 // indirect
 	github.com/fxamacker/cbor/v2 v2.9.0 // indirect

go.sum

@@ -4,6 +4,10 @@ github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/bits-and-blooms/bitset v1.24.1 h1:hqnfFbjjk3pxGa5E9Ho3hjoU7odtUuNmJ9Ao+Bo8s1c=
 github.com/bits-and-blooms/bitset v1.24.1/go.mod h1:7hO7Gc7Pp1vODcmWvKMRA9BNmbv6a/7QIWpPxHddWR8=
+github.com/bsm/ginkgo/v2 v2.12.0 h1:Ny8MWAHyOepLGlLKYmXG4IEkioBysk6GpaRTLC8zwWs=
+github.com/bsm/ginkgo/v2 v2.12.0/go.mod h1:SwYbGRRDovPVboqFv0tPTcG1sN61LM1Z4ARdbAV9g4c=
+github.com/bsm/gomega v1.27.10 h1:yeMWxP2pV2fG3FgAODIY8EiRE3dy0aeFYt4l7wh6yKA=
+github.com/bsm/gomega v1.27.10/go.mod h1:JyEr/xRbxbtgWNi8tIEVPUYZ5Dzef52k01W3YH0H+O0=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
@@ -13,6 +17,8 @@ github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
+github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
 github.com/dprotaso/go-yit v0.0.0-20191028211022-135eb7262960/go.mod h1:9HQzr9D/0PGwMEbC3d5AB7oi67+h4TsQqItC1GVYG58=
 github.com/dprotaso/go-yit v0.0.0-20220510233725-9ba8df137936 h1:PRxIJD8XjimM5aTknUK9w6DHLDox2r2M3DI4i2pnd3w=
 github.com/dprotaso/go-yit v0.0.0-20220510233725-9ba8df137936/go.mod h1:ttYvX5qlB+mlV1okblJqcSMtR4c52UKxDiX9GRBS8+Q=
@@ -168,6 +174,8 @@ github.com/prometheus/procfs v0.18.0 h1:2QTA9cKdznfYJz7EDaa7IiJobHuV7E1WzeBwcrhk
 github.com/prometheus/procfs v0.18.0/go.mod h1:M0aotyiemPhBCM0z5w87kL22CxfcH05ZpYlu+b4J7mw=
 github.com/rabbitmq/amqp091-go v1.10.0 h1:STpn5XsHlHGcecLmMFCtg7mqq0RnD+zFr4uzukfVhBw=
 github.com/rabbitmq/amqp091-go v1.10.0/go.mod h1:Hy4jKW5kQART1u+JkDTF9YYOQUHXqMuhrgxOEeS7G4o=
+github.com/redis/go-redis/v9 v9.16.0 h1:OotgqgLSRCmzfqChbQyG1PHC3tLNR89DG4jdOERSEP4=
+github.com/redis/go-redis/v9 v9.16.0/go.mod h1:u410H11HMLoB+TP67dz8rL9s6QW2j76l0//kSOd3370=
 github.com/rogpeppe/go-internal v1.13.1 h1:KvO1DLK/DRN07sQ1LQKScxyZJuNnedQ5/wKSR38lUII=
 github.com/rogpeppe/go-internal v1.13.1/go.mod h1:uMEvuHeurkdAXX61udpOXGD/AzZDWNMNyH2VO9fmH0o=
 github.com/sergi/go-diff v1.1.0 h1:we8PVUC3FE2uYfodKH/nBHMSetSfHDR6scGdBi+erh0=

pkg/actor/mutation_registry_test.go

@@ -21,8 +21,8 @@ func TestRegisteredMutationBasics(t *testing.T) {
 		func(state *cartState, msg *messages.AddItem) error {
 			state.calls++
 			// copy to avoid external mutation side-effects (not strictly necessary for the test)
-			cp := *msg
-			state.lastAdded = &cp
+			cp := msg
+			state.lastAdded = cp
 			return nil
 		},
 		func() *messages.AddItem { return &messages.AddItem{} },

pkg/inventory/memory_service.go

@@ -0,0 +1,47 @@
+package inventory
+
+import (
+	"errors"
+	"sync"
+)
+
+type MemoryInventoryService struct {
+	warehouses map[LocationID]*Warehouse
+	mu         sync.RWMutex
+}
+
+func NewMemoryInventoryService() *MemoryInventoryService {
+	return &MemoryInventoryService{
+		warehouses: make(map[LocationID]*Warehouse),
+	}
+}
+
+func (s *MemoryInventoryService) AddWarehouse(warehouse *Warehouse) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.warehouses[warehouse.ID] = warehouse
+}
+
+func (s *MemoryInventoryService) GetInventory(sku SKU, locationID LocationID) (*InventoryItem, error) {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	warehouse, ok := s.warehouses[locationID]
+	if !ok {
+		return nil, errors.New("warehouse not found")
+	}
+
+	for _, item := range warehouse.Inventory {
+		if item.SKU == sku {
+			return &item, nil
+		}
+	}
+	return nil, errors.New("sku not found in warehouse")
+}
+
+func (s *MemoryInventoryService) ReserveInventory(req ...ReserveRequest) error {
+	// We'll implement the reservation logic using Lua script execution here
+
+	// For now, let's just return an error indicating it's not implemented
+	return errors.New("reservation not implemented yet")
+}

pkg/inventory/redis_service.go

@@ -0,0 +1,107 @@
+package inventory
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+
+	"github.com/redis/go-redis/v9"
+)
+
+type RedisInventoryService struct {
+	client     *redis.Client
+	ctx        context.Context
+	luaScripts map[string]*redis.Script
+}
+
+func NewRedisInventoryService(client *redis.Client, ctx context.Context) (*RedisInventoryService, error) {
+	rdb := client
+
+	// Ping Redis to check connection
+	_, err := rdb.Ping(ctx).Result()
+	if err != nil {
+		return nil, err
+	}
+
+	return &RedisInventoryService{
+		client:     rdb,
+		ctx:        ctx,
+		luaScripts: make(map[string]*redis.Script),
+	}, nil
+}
+
+func (s *RedisInventoryService) LoadLuaScript(key string) error {
+	// Get the script from Redis
+	script, err := s.client.Get(s.ctx, key).Result()
+	if err != nil {
+		return err
+	}
+
+	// Load the script into the luaScripts cache
+	s.luaScripts[key] = redis.NewScript(script)
+	return nil
+}
+
+func (s *RedisInventoryService) AddWarehouse(warehouse *Warehouse) error {
+	// Convert warehouse to Redis-friendly format
+	data := map[string]interface{}{
+		"id":        string(warehouse.ID),
+		"name":      warehouse.Name,
+		"inventory": warehouse.Inventory,
+	}
+
+	// Store in Redis with a key pattern like "warehouse:<ID>"
+	key := "warehouse:" + string(warehouse.ID)
+	_, err := s.client.HMSet(s.ctx, key, data).Result()
+	return err
+}
+
+func (s *RedisInventoryService) GetInventory(sku SKU, locationID LocationID) (*InventoryItem, error) {
+	// Get the warehouse from Redis
+	key := "warehouse:" + string(locationID)
+	result, err := s.client.HGetAll(s.ctx, key).Result()
+	if err != nil {
+		return nil, err
+	}
+
+	// Parse the inventory items
+	var inventoryItems []InventoryItem
+	for _, itemData := range result {
+		var item InventoryItem
+		if err := json.Unmarshal([]byte(itemData), &item); err == nil {
+			inventoryItems = append(inventoryItems, item)
+		}
+	}
+
+	// Find the requested SKU
+	for _, item := range inventoryItems {
+		if item.SKU == sku {
+			return &item, nil
+		}
+	}
+
+	return nil, errors.New("sku not found in warehouse")
+}
+
+func (s *RedisInventoryService) ReserveInventory(req ReserveRequest) error {
+	return nil
+	// Get the Lua script from Redis
+	// key := "lua:reserve_inventory"
+	// script, err := s.client.Get(s.ctx, key).Result()
+	// if err != nil {
+	// 	return err
+	// }
+
+	// luaScript := redis.NewScript(script)
+
+	// // Prepare arguments for the Lua script
+	// args := []interface{}{
+	// 	string(req.LocationID),
+	// 	string(req.SKU),
+	// 	req.Quantity,
+	// }
+
+	// // Execute the Lua script
+	// cmd := s.client.Eval(s.ctx, luaScript, len(args), args...)
+	//return err
+}

pkg/inventory/types.go

@@ -0,0 +1,30 @@
+package inventory
+
+import "time"
+
+type SKU string
+
+type LocationID string
+
+type InventoryItem struct {
+	SKU        SKU
+	Quantity   int
+	LastUpdate time.Time
+}
+
+type Warehouse struct {
+	ID        LocationID
+	Name      string
+	Inventory []InventoryItem
+}
+
+type InventoryService interface {
+	GetInventory(sku SKU, locationID LocationID) (uint32, error)
+	ReserveInventory(req ...ReserveRequest) error
+}
+
+type ReserveRequest struct {
+	SKU        SKU
+	LocationID LocationID
+	Quantity   uint32
+}