From 82e03978b89938219958032efb1448cc76baa181 Mon Sep 17 00:00:00 2001
From: Saumit <justsaumit@protonmail.com>
Date: Sat, 27 Sep 2025 02:14:26 +0530
Subject: Initial snapshot - OpenTelemetry demo 2.1.3 -f

---
 src/frontend/gateways/Api.gateway.ts | 119 +++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 src/frontend/gateways/Api.gateway.ts

(limited to 'src/frontend/gateways/Api.gateway.ts')

diff --git a/src/frontend/gateways/Api.gateway.ts b/src/frontend/gateways/Api.gateway.ts
new file mode 100644
index 0000000..eb9438c
--- /dev/null
+++ b/src/frontend/gateways/Api.gateway.ts
@@ -0,0 +1,119 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+import { Ad, Address, Cart, CartItem, Money, PlaceOrderRequest, Product } from '../protos/demo';
+import { IProductCart, IProductCartItem, IProductCheckout } from '../types/Cart';
+import request from '../utils/Request';
+import { AttributeNames } from '../utils/enums/AttributeNames';
+import SessionGateway from './Session.gateway';
+import { context, propagation } from "@opentelemetry/api";
+
+const { userId } = SessionGateway.getSession();
+
+const basePath = '/api';
+
+const Apis = () => ({
+  getCart(currencyCode: string) {
+    return request<IProductCart>({
+      url: `${basePath}/cart`,
+      queryParams: { sessionId: userId, currencyCode },
+    });
+  },
+  addCartItem({ currencyCode, ...item }: CartItem & { currencyCode: string }) {
+    return request<Cart>({
+      url: `${basePath}/cart`,
+      body: { item, userId },
+      queryParams: { currencyCode },
+      method: 'POST',
+    });
+  },
+  emptyCart() {
+    return request<undefined>({
+      url: `${basePath}/cart`,
+      method: 'DELETE',
+      body: { userId },
+    });
+  },
+
+  getSupportedCurrencyList() {
+    return request<string[]>({
+      url: `${basePath}/currency`,
+    });
+  },
+
+  getShippingCost(itemList: IProductCartItem[], currencyCode: string, address: Address) {
+    return request<Money>({
+      url: `${basePath}/shipping`,
+      queryParams: {
+        itemList: JSON.stringify(itemList.map(({ productId, quantity }) => ({ productId, quantity }))),
+        currencyCode,
+        address: JSON.stringify(address),
+      },
+    });
+  },
+
+  placeOrder({ currencyCode, ...order }: PlaceOrderRequest & { currencyCode: string }) {
+    return request<IProductCheckout>({
+      url: `${basePath}/checkout`,
+      method: 'POST',
+      queryParams: { currencyCode },
+      body: order,
+    });
+  },
+
+  listProducts(currencyCode: string) {
+    return request<Product[]>({
+      url: `${basePath}/products`,
+      queryParams: { currencyCode },
+    });
+  },
+  getProduct(productId: string, currencyCode: string) {
+    return request<Product>({
+      url: `${basePath}/products/${productId}`,
+      queryParams: { currencyCode },
+    });
+  },
+  listRecommendations(productIds: string[], currencyCode: string) {
+    return request<Product[]>({
+      url: `${basePath}/recommendations`,
+      queryParams: {
+        productIds,
+        sessionId: userId,
+        currencyCode,
+      },
+    });
+  },
+  listAds(contextKeys: string[]) {
+    return request<Ad[]>({
+      url: `${basePath}/data`,
+      queryParams: {
+        contextKeys,
+      },
+    });
+  },
+});
+
+/**
+ * Extends all the API calls to set baggage automatically.
+ */
+const ApiGateway = new Proxy(Apis(), {
+  get(target, prop, receiver) {
+    const originalFunction = Reflect.get(target, prop, receiver);
+
+    if (typeof originalFunction !== 'function') {
+      return originalFunction;
+    }
+
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    return function (...args: any[]) {
+      const baggage = propagation.getActiveBaggage() || propagation.createBaggage();
+      const newBaggage = baggage.setEntry(AttributeNames.SESSION_ID, { value: userId });
+      const newContext = propagation.setBaggage(context.active(), newBaggage);
+      return context.with(newContext, () => {
+        return Reflect.apply(originalFunction, undefined, args);
+      });
+    };
+  },
+});
+
+export default ApiGateway;
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