Fix missing api/auth, api/guides pages (#9153)

The `api/auth` route added for the changelog conflicts with the `api/auth` docs
page that would normally be handled by the catchall `[[...path]]` route.
Move it under the `changelog` path to fix the route conflict.

Even so, the pages continued to 404.

Commit 680c7c4 added memoized the fetch for OpenAPI JSON in the
`resolveOpenAPI` function, but that particular implementation caused some
problems with the build output. Some of the pages in the API section went
missing.

The previous implementation was susceptible to a bit of a race condition, since
the cached value wasn't set until after several async calls. When Next tries to
aggressively build pages, multiple calls could have gotten through to do live
calls, and then all of them would have tried to set the cache variable. I don't
know the exact pathway to the issue but I suspect this had something to do with
the missing pages (some sort of data corruption?). Sorry, I know this is handwavy.

Anyway, replacing that implementation with a more robust one - one that caches
a promise on the first call, and reuses that promise on all future calls - will
definitely only fetch once per process. When the fetch completes, everyone
waiting on the promise will awaken, and then future callers of the method will
get a resolved promise for immediate results.

And, most importantly, this method of caching doesn't cause the `api/auth` and
`api/guides` pages to go missing.

app/changelog/%5Fadmin/layout.tsx

@@ -1,5 +1,5 @@
 import {type ReactNode, Suspense} from 'react';
-import {GET} from 'app/api/auth/[...nextauth]/route';
+import {GET} from 'app/changelog/api/auth/[...nextauth]/route';
 import {getServerSession} from 'next-auth/next';
 
 import LoginButton from 'sentry-docs/components/changelog/loginButton';

app/changelog/%5Fadmin/upload/route.tsx

@@ -1,7 +1,7 @@
 import crypto from 'crypto';
 
 import {Storage} from '@google-cloud/storage';
-import {GET as sessionHandler} from 'app/api/auth/[...nextauth]/route';
+import {GET as sessionHandler} from 'app/changelog/api/auth/[...nextauth]/route';
 import {NextRequest} from 'next/server';
 import {getServerSession} from 'next-auth/next';
 

app/changelog/[slug]/page.tsx

@@ -1,7 +1,7 @@
 import {Fragment, Suspense} from 'react';
 import {type Category, type Changelog} from '@prisma/client';
 import * as Sentry from '@sentry/nextjs';
-import {GET} from 'app/api/auth/[...nextauth]/route';
+import {GET} from 'app/changelog/api/auth/[...nextauth]/route';
 import type {Metadata, ResolvingMetadata} from 'next';
 import Link from 'next/link';
 import {getServerSession} from 'next-auth/next';

src/actions/changelog.ts

@@ -1,6 +1,6 @@
 'use server';
 
-import {GET as handler} from 'app/api/auth/[...nextauth]/route';
+import {GET as handler} from 'app/changelog/api/auth/[...nextauth]/route';
 import {revalidatePath} from 'next/cache';
 import {redirect} from 'next/navigation';
 import {getServerSession} from 'next-auth/next';

src/build/resolveOpenAPI.ts

@@ -4,8 +4,6 @@
 
 import {promises as fs} from 'fs';
 
-import {cache} from 'react';
-
 import {DeRefedOpenAPI} from './open-api/types';
 
 // SENTRY_API_SCHEMA_SHA is used in the sentry-docs GHA workflow in getsentry/sentry-api-schema.
@@ -14,8 +12,6 @@ const SENTRY_API_SCHEMA_SHA = '78a8da372a1912d69e27b7f36603017cd29b6815';
 
 const activeEnv = process.env.GATSBY_ENV || process.env.NODE_ENV || 'development';
 
-let cachedResonse: DeRefedOpenAPI | null = null;
-
 async function resolveOpenAPI(): Promise<DeRefedOpenAPI> {
   if (activeEnv === 'development' && process.env.OPENAPI_LOCAL_PATH) {
     try {
@@ -29,16 +25,10 @@ async function resolveOpenAPI(): Promise<DeRefedOpenAPI> {
       );
     }
   }
-
-  if (cachedResonse) {
-    return cachedResonse;
-  }
   const response = await fetch(
-    `https://raw.githubusercontent.com/getsentry/sentry-api-schema/${SENTRY_API_SCHEMA_SHA}/openapi-derefed.json`,
-    {cache: 'no-store'}
+    `https://raw.githubusercontent.com/getsentry/sentry-api-schema/${SENTRY_API_SCHEMA_SHA}/openapi-derefed.json`
   );
-  cachedResonse = await response.json();
-  return cachedResonse!;
+  return await response.json();
 }
 
 export type APIParameter = {
@@ -85,7 +75,17 @@ function slugify(s: string): string {
     .toLowerCase();
 }
 
-export const apiCategories = cache(async (): Promise<APICategory[]> => {
+let apiCategoriesCache: Promise<APICategory[]> | undefined;
+
+export function apiCategories(): Promise<APICategory[]> {
+  if (apiCategoriesCache) {
+    return apiCategoriesCache;
+  }
+  apiCategoriesCache = apiCategoriesUncached();
+  return apiCategoriesCache;
+}
+
+async function apiCategoriesUncached(): Promise<APICategory[]> {
   const data = await resolveOpenAPI();
 
   const categoryMap: {[name: string]: APICategory} = {};
@@ -150,7 +150,7 @@ export const apiCategories = cache(async (): Promise<APICategory[]> => {
     c.apis.sort((a, b) => a.name.localeCompare(b.name));
   });
   return categories;
-});
+}
 
 function getBodyParameters(apiData): APIParameter[] {
   const content = apiData.requestBody?.content;