implement redis inventory with threadsafe reservation

cmd/inventory/main.go

@@ -2,8 +2,9 @@ package main
 
 import (
 	"context"
-	"fmt"
+	"log"
 
+	"git.tornberg.me/go-cart-actor/pkg/inventory"
 	"github.com/redis/go-redis/v9"
 	"github.com/redis/go-redis/v9/maintnotifications"
 )
@@ -18,24 +19,36 @@ func main() {
 			Mode: maintnotifications.ModeDisabled,
 		},
 	})
-
-	err := rdb.Set(ctx, "key", "value", 0).Err()
+	s, err := inventory.NewRedisInventoryService(rdb, ctx)
 	if err != nil {
-		panic(err)
+		log.Fatalf("Unable to connect to inventory redis", err)
+		return
 	}
-
-	val, err := rdb.Get(ctx, "key").Result()
+	rdb.Pipelined(ctx, func(p redis.Pipeliner) error {
+		s.UpdateInventory(p, "1", "1", 10)
+		s.UpdateInventory(p, "2", "2", 20)
+		s.UpdateInventory(p, "3", "3", 30)
+		s.UpdateInventory(p, "4", "4", 40)
+		return nil
+	})
+	err = s.ReserveInventory(inventory.ReserveRequest{
+		SKU:        "1",
+		LocationID: "1",
+		Quantity:   3,
+	}, inventory.ReserveRequest{
+		SKU:        "2",
+		LocationID: "2",
+		Quantity:   15,
+	})
 	if err != nil {
-		panic(err)
+		log.Printf("Unable to reserve inventory: %v", err)
+		return
 	}
-	fmt.Println("key", val)
+	v, err := s.GetInventory("1", "1")
+	if err != nil {
+		log.Printf("Unable to get inventory: %v", err)
+		return
+	}
+	log.Printf("Inventory after reservation: %v", v)
 
-	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)
-	}
 }