feat(prerender): support retry and retryDelay (#1534)

docs/content/3.config.md

@@ -347,7 +347,9 @@ Default:
   failOnError: false,
   crawlLinks: false,
   ignore: [],
-  routes: []
+  routes: [],
+  retries: 3,
+  retryDelay: 500
 }
 ```
 
@@ -372,6 +374,8 @@ Set `autoSubfolderIndex` lets you control how to generate the files in the `.out
 
 This option is useful when your hosting provider does not give you an option regarding the trailing slash.
 
+The prerenderer will attempt to render pages 3 times with a delay of 500ms. Use `retry` and `retryDelay` to change this behavior.
+
 ## Directories
 
 ### `rootDir`

src/options.ts

@@ -79,6 +79,8 @@ const NitroDefaults: NitroConfig = {
     autoSubfolderIndex: true,
     concurrency: 1,
     interval: 0,
+    retry: 3,
+    retryDelay: 500,
     failOnError: false,
     crawlLinks: false,
     ignore: [],

src/prerender.ts

@@ -5,6 +5,7 @@ import chalk from "chalk";
 import { createRouter as createRadixRouter, toRouteMatcher } from "radix3";
 import { defu } from "defu";
 import mime from "mime";
+import type { $Fetch } from "ofetch";
 import { createNitro } from "./nitro";
 import { build } from "./build";
 import type { Nitro, NitroRouteRules, PrerenderRoute } from "./types";
@@ -77,7 +78,9 @@ export async function prerender(nitro: Nitro) {
     nitroRenderer.options.output.serverDir,
     "index.mjs"
   );
-  const { localFetch } = await import(pathToFileURL(serverEntrypoint).href);
+  const { localFetch } = (await import(
+    pathToFileURL(serverEntrypoint).href
+  )) as { localFetch: $Fetch };
 
   // Create route rule matcher
   const _routeRulesMatcher = toRouteMatcher(
@@ -164,13 +167,15 @@ export async function prerender(nitro: Nitro) {
 
     // Fetch the route
     const encodedRoute = encodeURI(route);
-    const res = await (localFetch(
+
+    const res = await localFetch<Response>(
       withBase(encodedRoute, nitro.options.baseURL),
       {
         headers: { "x-nitro-prerender": encodedRoute },
+        retry: nitro.options.prerender.retry,
+        retryDelay: nitro.options.prerender.retryDelay,
       }
-    ) as ReturnType<typeof fetch>);
-
+    );
     // Data will be removed as soon as written to the disk
     let dataBuff: Buffer | undefined = Buffer.from(await res.arrayBuffer());
 

src/types/nitro.ts

@@ -297,6 +297,16 @@ export interface NitroOptions extends PresetOptions {
     failOnError: boolean;
     ignore: string[];
     routes: string[];
+    /**
+     * Amount of retries. Pass Infinity to retry indefinitely.
+     * @default 3
+     */
+    retry: number;
+    /**
+     * Delay between each retry in ms.
+     * @default 500
+     */
+    retryDelay: number;
   };
 
   // Rollup