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Fix fetch cache for isr (#783)
* patch for the fetch cache with ISR * update rule for unstable_cache * add e2e test * fix linting * changeset & review * remove patchAsyncStorage on next 14.2+ * fix linting
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‎.changeset/khaki-rice-applaud.md‎

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---
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"@opennextjs/aws": patch
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---
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fix fetch and unstable_cache not working for ISR requests

‎examples/app-router/app/isr-data-cache/page.tsx‎

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import { unstable_cache } from "next/cache";
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async function getTime() {
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return new Date().toISOString();
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}
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const cachedTime = unstable_cache(getTime, { revalidate: false });
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export const revalidate = 10;
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export default async function ISR() {
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const responseOpenNext = await fetch("https://opennext.js.org", {
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cache: "force-cache",
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});
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const dateInOpenNext = responseOpenNext.headers.get("date");
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const cachedTimeValue = await cachedTime();
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const time = getTime();
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return (
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<div>
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<h1>Date from from OpenNext</h1>
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<p data-testid="fetched-date">
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Date from from OpenNext: {dateInOpenNext}
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</p>
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<h1>Cached Time</h1>
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<p data-testid="cached-date">Cached Time: {cachedTimeValue}</p>
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<h1>Time</h1>
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<p data-testid="time">Time: {time}</p>
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</div>
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);
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}

‎examples/app-router/next.config.ts‎

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@@ -9,6 +9,10 @@ const nextConfig: NextConfig = {
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eslint: {
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ignoreDuringBuilds: true,
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},
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//TODO: remove this when i'll figure out why it fails locally
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typescript: {
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ignoreBuildErrors: true,
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},
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images: {
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remotePatterns: [
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{

‎packages/open-next/src/build/createServerBundle.ts‎

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@@ -17,6 +17,10 @@ import { generateEdgeBundle } from "./edge/createEdgeBundle.js";
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import * as buildHelper from "./helper.js";
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import { installDependencies } from "./installDeps.js";
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import { type CodePatcher, applyCodePatches } from "./patch/codePatcher.js";
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import {
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patchFetchCacheForISR,
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patchUnstableCacheForISR,
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} from "./patch/patchFetchCacheISR.js";
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import { patchFetchCacheSetMissingWaitUntil } from "./patch/patchFetchCacheWaitUntil.js";
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interface CodeCustomization {
@@ -181,6 +185,8 @@ async function generateBundle(
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await applyCodePatches(options, tracedFiles, manifests, [
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patchFetchCacheSetMissingWaitUntil,
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patchFetchCacheForISR,
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patchUnstableCacheForISR,
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...additionalCodePatches,
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]);
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@@ -206,6 +212,12 @@ async function generateBundle(
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"14.1",
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);
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const isAfter142 = buildHelper.compareSemver(
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options.nextVersion,
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">=",
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"14.2",
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);
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const disableRouting = isBefore13413 || config.middleware?.external;
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const updater = new ContentUpdater(options);
@@ -221,6 +233,7 @@ async function generateBundle(
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deletes: [
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...(disableNextPrebundledReact ? ["applyNextjsPrebundledReact"] : []),
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...(disableRouting ? ["withRouting"] : []),
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...(isAfter142 ? ["patchAsyncStorage"] : []),
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],
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}),
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openNextReplacementPlugin({

‎packages/open-next/src/build/patch/patchFetchCacheISR.ts‎

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import { Lang } from "@ast-grep/napi";
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import { getCrossPlatformPathRegex } from "utils/regex.js";
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import { createPatchCode } from "./astCodePatcher.js";
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import type { CodePatcher } from "./codePatcher";
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export const fetchRule = `
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rule:
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kind: member_expression
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pattern: $WORK_STORE.isOnDemandRevalidate
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inside:
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kind: ternary_expression
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all:
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- has: {kind: 'null'}
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- has:
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kind: await_expression
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has:
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kind: call_expression
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all:
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- has:
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kind: member_expression
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has:
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kind: property_identifier
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field: property
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regex: get
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- has:
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kind: arguments
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has:
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kind: object
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has:
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kind: pair
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all:
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- has:
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kind: property_identifier
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field: key
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regex: softTags
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inside:
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kind: variable_declarator
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fix:
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($WORK_STORE.isOnDemandRevalidate && !globalThis.__openNextAls?.getStore()?.isISRRevalidation)
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`;
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export const unstable_cacheRule = `
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rule:
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kind: member_expression
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pattern: $STORE_OR_CACHE.isOnDemandRevalidate
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inside:
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kind: if_statement
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stopBy: end
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has:
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kind: statement_block
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has:
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kind: variable_declarator
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has:
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kind: await_expression
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has:
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kind: call_expression
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all:
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- has:
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kind: member_expression
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has:
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kind: property_identifier
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field: property
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regex: get
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- has:
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kind: arguments
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has:
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kind: object
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has:
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kind: pair
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all:
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- has:
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kind: property_identifier
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field: key
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regex: softTags
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stopBy: end
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fix:
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($STORE_OR_CACHE.isOnDemandRevalidate && !globalThis.__openNextAls?.getStore()?.isISRRevalidation)
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`;
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export const patchFetchCacheForISR: CodePatcher = {
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name: "patch-fetch-cache-for-isr",
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patches: [
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{
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versions: ">=14.0.0",
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field: {
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pathFilter: getCrossPlatformPathRegex(
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String.raw`(server/chunks/.*\.js|.*\.runtime\..*\.js|patch-fetch\.js)$`,
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{ escape: false },
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),
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contentFilter: /\.isOnDemandRevalidate/,
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patchCode: createPatchCode(fetchRule, Lang.JavaScript),
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},
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},
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],
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};
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export const patchUnstableCacheForISR: CodePatcher = {
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name: "patch-unstable-cache-for-isr",
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patches: [
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{
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versions: ">=14.2.0",
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field: {
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pathFilter: getCrossPlatformPathRegex(
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String.raw`(server/chunks/.*\.js|.*\.runtime\..*\.js|spec-extension/unstable-cache\.js)$`,
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{ escape: false },
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),
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contentFilter: /\.isOnDemandRevalidate/,
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patchCode: createPatchCode(unstable_cacheRule, Lang.JavaScript),
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},
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},
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],
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};

‎packages/open-next/src/core/requestHandler.ts‎

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@@ -31,7 +31,9 @@ import { requestHandler, setNextjsPrebundledReact } from "./util";
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// This is used to identify requests in the cache
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globalThis.__openNextAls = new AsyncLocalStorage();
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//#override patchAsyncStorage
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patchAsyncStorage();
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//#endOverride
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export async function openNextHandler(
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internalEvent: InternalEvent,

‎packages/tests-e2e/tests/appRouter/isr.test.ts‎

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@@ -61,3 +61,35 @@ test("headers", async ({ page }) => {
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await page.reload();
6262
}
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});
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test("Incremental Static Regeneration with data cache", async ({ page }) => {
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test.setTimeout(45000);
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await page.goto("/isr-data-cache");
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const originalFetchedDate = await page
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.getByTestId("fetched-date")
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.textContent();
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const originalCachedDate = await page
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.getByTestId("cached-date")
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.textContent();
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const originalTime = await page.getByTestId("time").textContent();
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await page.reload();
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let finalTime = originalTime;
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let finalCachedDate = originalCachedDate;
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let finalFetchedDate = originalFetchedDate;
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// Wait 10 + 1 seconds for ISR to regenerate time
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await page.waitForTimeout(11000);
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do {
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await page.waitForTimeout(2000);
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finalTime = await page.getByTestId("time").textContent();
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finalCachedDate = await page.getByTestId("cached-date").textContent();
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finalFetchedDate = await page.getByTestId("fetched-date").textContent();
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await page.reload();
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} while (originalTime === finalTime);
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expect(originalTime).not.toEqual(finalTime);
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expect(originalCachedDate).toEqual(finalCachedDate);
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expect(originalFetchedDate).toEqual(finalFetchedDate);
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});

‎packages/tests-unit/tests/build/patch/patchFetchCacheISR.test.ts‎

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import { patchCode } from "@opennextjs/aws/build/patch/astCodePatcher.js";
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import {
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fetchRule,
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unstable_cacheRule,
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} from "@opennextjs/aws/build/patch/patchFetchCacheISR.js";
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import { describe } from "vitest";
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const unstable_cacheCode = `
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if (// when we are nested inside of other unstable_cache's
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// we should bypass cache similar to fetches
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!isNestedUnstableCache && workStore.fetchCache !== 'force-no-store' && !workStore.isOnDemandRevalidate && !incrementalCache.isOnDemandRevalidate && !workStore.isDraftMode) {
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// We attempt to get the current cache entry from the incremental cache.
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const cacheEntry = await incrementalCache.get(cacheKey, {
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kind: _responsecache.IncrementalCacheKind.FETCH,
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revalidate: options.revalidate,
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tags,
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softTags: implicitTags,
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fetchIdx,
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fetchUrl
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});
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}
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else {
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noStoreFetchIdx += 1;
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// We are in Pages Router or were called outside of a render. We don't have a store
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// so we just call the callback directly when it needs to run.
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// If the entry is fresh we return it. If the entry is stale we return it but revalidate the entry in
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// the background. If the entry is missing or invalid we generate a new entry and return it.
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if (!incrementalCache.isOnDemandRevalidate) {
29+
// We aren't doing an on demand revalidation so we check use the cache if valid
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const implicitTags = !workUnitStore || workUnitStore.type === 'unstable-cache' ? [] : workUnitStore.implicitTags;
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const cacheEntry = await incrementalCache.get(cacheKey, {
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kind: _responsecache.IncrementalCacheKind.FETCH,
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revalidate: options.revalidate,
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tags,
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fetchIdx,
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fetchUrl,
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softTags: implicitTags
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});
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}
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`;
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const patchFetchCacheCodeUnMinified = `
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const entry = workStore.isOnDemandRevalidate ? null : await incrementalCache.get(cacheKey, {
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kind: _responsecache.IncrementalCacheKind.FETCH,
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revalidate: finalRevalidate,
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fetchUrl,
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fetchIdx,
48+
tags,
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softTags: implicitTags
50+
});
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`;
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const patchFetchCacheCodeMinifiedNext15 = `
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let t=P.isOnDemandRevalidate?null:await V.get(n,{kind:l.IncrementalCacheKind.FETCH,revalidate:_,fetchUrl:y,fetchIdx:X,tags:N,softTags:C});
55+
`;
56+
57+
describe("patchUnstableCacheForISR", () => {
58+
test("on unminified code", async () => {
59+
expect(
60+
patchCode(unstable_cacheCode, unstable_cacheRule),
61+
).toMatchInlineSnapshot(`
62+
"if (// when we are nested inside of other unstable_cache's
63+
// we should bypass cache similar to fetches
64+
!isNestedUnstableCache && workStore.fetchCache !== 'force-no-store' && !(workStore.isOnDemandRevalidate && !globalThis.__openNextAls?.getStore()?.isISRRevalidation) && !(incrementalCache.isOnDemandRevalidate && !globalThis.__openNextAls?.getStore()?.isISRRevalidation) && !workStore.isDraftMode) {
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// We attempt to get the current cache entry from the incremental cache.
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const cacheEntry = await incrementalCache.get(cacheKey, {
67+
kind: _responsecache.IncrementalCacheKind.FETCH,
68+
revalidate: options.revalidate,
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tags,
70+
softTags: implicitTags,
71+
fetchIdx,
72+
fetchUrl
73+
});
74+
}
75+
else {
76+
noStoreFetchIdx += 1;
77+
// We are in Pages Router or were called outside of a render. We don't have a store
78+
// so we just call the callback directly when it needs to run.
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// If the entry is fresh we return it. If the entry is stale we return it but revalidate the entry in
80+
// the background. If the entry is missing or invalid we generate a new entry and return it.
81+
if (!(incrementalCache.isOnDemandRevalidate && !globalThis.__openNextAls?.getStore()?.isISRRevalidation)) {
82+
// We aren't doing an on demand revalidation so we check use the cache if valid
83+
const implicitTags = !workUnitStore || workUnitStore.type === 'unstable-cache' ? [] : workUnitStore.implicitTags;
84+
const cacheEntry = await incrementalCache.get(cacheKey, {
85+
kind: _responsecache.IncrementalCacheKind.FETCH,
86+
revalidate: options.revalidate,
87+
tags,
88+
fetchIdx,
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fetchUrl,
90+
softTags: implicitTags
91+
});
92+
}
93+
"
94+
`);
95+
});
96+
});
97+
98+
describe("patchFetchCacheISR", () => {
99+
describe("Next 15", () => {
100+
test("on unminified code", async () => {
101+
expect(
102+
patchCode(patchFetchCacheCodeUnMinified, fetchRule),
103+
).toMatchInlineSnapshot(`
104+
"const entry = (workStore.isOnDemandRevalidate && !globalThis.__openNextAls?.getStore()?.isISRRevalidation) ? null : await incrementalCache.get(cacheKey, {
105+
kind: _responsecache.IncrementalCacheKind.FETCH,
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revalidate: finalRevalidate,
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fetchUrl,
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fetchIdx,
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tags,
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softTags: implicitTags
111+
});
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"
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`);
114+
});
115+
116+
test("on minified code", async () => {
117+
expect(
118+
patchCode(patchFetchCacheCodeMinifiedNext15, fetchRule),
119+
).toMatchInlineSnapshot(`
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"let t=(P.isOnDemandRevalidate && !globalThis.__openNextAls?.getStore()?.isISRRevalidation)?null:await V.get(n,{kind:l.IncrementalCacheKind.FETCH,revalidate:_,fetchUrl:y,fetchIdx:X,tags:N,softTags:C});
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"
122+
`);
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});
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});
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//TODO: Add test for Next 14.2.24
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});

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