1 files changed, 29 insertions, 0 deletions
diff --git a/src/frontend/gateways/rpc/Cart.gateway.ts b/src/frontend/gateways/rpc/Cart.gateway.ts
new file mode 100644
index 0000000..25dfc87
--- /dev/null
+++ b/src/frontend/gateways/rpc/Cart.gateway.ts
@@ -0,0 +1,29 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+import { ChannelCredentials } from '@grpc/grpc-js';
+import { Cart, CartItem, CartServiceClient, Empty } from '../../protos/demo';
+
+const { CART_ADDR = '' } = process.env;
+
+const client = new CartServiceClient(CART_ADDR, ChannelCredentials.createInsecure());
+
+const CartGateway = () => ({
+  getCart(userId: string) {
+    return new Promise<Cart>((resolve, reject) =>
+      client.getCart({ userId }, (error, response) => (error ? reject(error) : resolve(response)))
+    );
+  },
+  addItem(userId: string, item: CartItem) {
+    return new Promise<Empty>((resolve, reject) =>
+      client.addItem({ userId, item }, (error, response) => (error ? reject(error) : resolve(response)))
+    );
+  },
+  emptyCart(userId: string) {
+    return new Promise<Empty>((resolve, reject) =>
+      client.emptyCart({ userId }, (error, response) => (error ? reject(error) : resolve(response)))
+    );
+  },
+});
+
+export default CartGateway();