Retry price preview before failing

Author: synzen

services/backend-api/client/src/contexts/PaddleContext.tsx

@@ -16,6 +16,7 @@ import { useUserMe } from "../features/discordUser";
 import { pages, PRODUCT_NAMES, ProductKey } from "../constants";
 import { CheckoutSummaryData } from "../types/CheckoutSummaryData";
 import { PricePreview } from "../types/PricePreview";
+import { retryPromise } from "../utils/retryPromise";
 
 const pwAuth = import.meta.env.VITE_PADDLE_PW_AUTH;
 const clientToken = import.meta.env.VITE_PADDLE_CLIENT_TOKEN;
@@ -173,9 +174,11 @@ export const PaddleContextProvider = ({ children }: PropsWithChildren<{}>) => {
       > = {};
 
       try {
-        const previewData = await paddle.PricePreview({
-          items: priceIdsToGet.map((priceId) => ({ priceId, quantity: 1 })),
-        });
+        const previewData = await retryPromise(async () =>
+          paddle.PricePreview({
+            items: priceIdsToGet.map((priceId) => ({ priceId, quantity: 1 })),
+          })
+        );
 
         const { details, currencyCode } = previewData.data;
 

services/backend-api/client/src/utils/retryPromise.ts

@@ -0,0 +1,24 @@
+/**
+ * A function to retry a promise with exponential backoff
+ */
+export const retryPromise = async <T>(
+  promise: () => Promise<T>,
+  retries = 3,
+  delay = 1000
+): Promise<T> => {
+  try {
+    return await promise();
+  } catch (error) {
+    if (retries <= 0) {
+      throw error;
+    }
+
+    await new Promise<void>((resolve) => {
+      setTimeout(() => {
+        resolve();
+      }, delay);
+    });
+
+    return retryPromise(promise, retries - 1, delay * 2);
+  }
+};