Revert "Merge branch 'rework-cache' into 'main'"

This reverts merge request !156

src/app.ts

@@ -134,7 +134,7 @@ app.get('/users/:username', actorController);
 
 app.get('/nodeinfo/:version', nodeInfoSchemaController);
 
-app.get('/api/v1/instance', cache({ expires: Time.minutes(5) }), instanceController);
+app.get('/api/v1/instance', cache({ cacheName: 'web', expires: Time.minutes(5) }), instanceController);
 
 app.get('/api/v1/apps/verify_credentials', appCredentialsController);
 app.post('/api/v1/apps', createAppController);
@@ -185,10 +185,10 @@ app.get('/api/v1/preferences', preferencesController);
 app.get('/api/v1/search', searchController);
 app.get('/api/v2/search', searchController);
 
-app.get('/api/pleroma/frontend_configurations', cache({ expires: Time.minutes(5) }), frontendConfigController);
+app.get('/api/pleroma/frontend_configurations', frontendConfigController);
 
-app.get('/api/v1/trends/tags', cache({ expires: Time.minutes(15) }), trendingTagsController);
-app.get('/api/v1/trends', cache({ expires: Time.minutes(15) }), trendingTagsController);
+app.get('/api/v1/trends/tags', cache({ cacheName: 'web', expires: Time.minutes(15) }), trendingTagsController);
+app.get('/api/v1/trends', cache({ cacheName: 'web', expires: Time.minutes(15) }), trendingTagsController);
 
 app.get('/api/v1/notifications', requirePubkey, notificationsController);
 app.get('/api/v1/favourites', requirePubkey, favouritesController);

src/middleware/cache.ts

@@ -1,45 +1,26 @@
 import { Debug, type MiddlewareHandler } from '@/deps.ts';
+import ExpiringCache from '@/utils/expiring-cache.ts';
 
 const debug = Debug('ditto:middleware:cache');
 
-interface CacheOpts {
-  expires: number;
-}
-
-/** In-memory cache middleware. */
-export const cache = (opts: CacheOpts): MiddlewareHandler => {
-  let response: Response | undefined;
-  let expires = Date.now() + opts.expires;
-
+export const cache = (options: {
+  cacheName: string;
+  expires?: number;
+}): MiddlewareHandler => {
   return async (c, next) => {
-    const now = Date.now();
-    const expired = now > expires;
-
-    async function updateCache() {
-      await next();
-      const res = c.res.clone();
-      if (res.status < 500) {
-        const old = response;
-        response = res;
-        old?.text(); // Prevent memory leaks.
-      }
-      return res;
-    }
-
-    if (response && !expired) {
-      debug('Serving page from cache', c.req.url);
-      return response.clone();
-    } else {
-      expires = Date.now() + opts.expires;
-      if (response && expired) {
-        debug('Serving stale cache, rebuilding', c.req.url);
-        const stale = response.clone();
-        updateCache();
-        await new Promise((resolve) => setTimeout(resolve, 0));
-        return stale;
-      }
+    const key = c.req.url.replace('http://', 'https://');
+    const cache = new ExpiringCache(await caches.open(options.cacheName));
+    const response = await cache.match(key);
+    if (!response) {
       debug('Building cache for page', c.req.url);
-      return await updateCache();
+      await next();
+      const response = c.res.clone();
+      if (response.status < 500) {
+        await cache.putExpiring(key, response, options.expires ?? 0);
+      }
+    } else {
+      debug('Serving page from cache', c.req.url);
+      return response;
     }
   };
 };

src/utils/expiring-cache.test.ts

@@ -0,0 +1,18 @@
+import { assert } from '@/deps-test.ts';
+
+import ExpiringCache from './expiring-cache.ts';
+
+Deno.test('ExpiringCache', async () => {
+  const cache = new ExpiringCache(await caches.open('test'));
+
+  await cache.putExpiring('http://mostr.local/1', new Response('hello world'), 300);
+  await cache.putExpiring('http://mostr.local/2', new Response('hello world'), -1);
+
+  // const resp1 = await cache.match('http://mostr.local/1');
+  const resp2 = await cache.match('http://mostr.local/2');
+
+  // assert(resp1!.headers.get('Expires'));
+  assert(!resp2);
+
+  // await resp1!.text();
+});

src/utils/expiring-cache.ts

@@ -0,0 +1,68 @@
+class ExpiringCache implements Cache {
+  #cache: Cache;
+
+  constructor(cache: Cache) {
+    this.#cache = cache;
+  }
+
+  add(request: RequestInfo | URL): Promise<void> {
+    return this.#cache.add(request);
+  }
+
+  addAll(requests: RequestInfo[]): Promise<void> {
+    return this.#cache.addAll(requests);
+  }
+
+  keys(request?: RequestInfo | URL | undefined, options?: CacheQueryOptions | undefined): Promise<readonly Request[]> {
+    return this.#cache.keys(request, options);
+  }
+
+  matchAll(
+    request?: RequestInfo | URL | undefined,
+    options?: CacheQueryOptions | undefined,
+  ): Promise<readonly Response[]> {
+    return this.#cache.matchAll(request, options);
+  }
+
+  put(request: RequestInfo | URL, response: Response): Promise<void> {
+    return this.#cache.put(request, response);
+  }
+
+  putExpiring(request: RequestInfo | URL, response: Response, expiresIn: number): Promise<void> {
+    const expires = Date.now() + expiresIn;
+
+    const clone = new Response(response.body, {
+      status: response.status,
+      headers: {
+        expires: new Date(expires).toUTCString(),
+        ...Object.fromEntries(response.headers.entries()),
+      },
+    });
+
+    return this.#cache.put(request, clone);
+  }
+
+  async match(request: RequestInfo | URL, options?: CacheQueryOptions | undefined): Promise<Response | undefined> {
+    const response = await this.#cache.match(request, options);
+    const expires = response?.headers.get('Expires');
+
+    if (response && expires) {
+      if (new Date(expires).getTime() > Date.now()) {
+        return response;
+      } else {
+        await Promise.all([
+          this.delete(request),
+          response.text(), // Prevent memory leaks
+        ]);
+      }
+    } else if (response) {
+      return response;
+    }
+  }
+
+  delete(request: RequestInfo | URL, options?: CacheQueryOptions | undefined): Promise<boolean> {
+    return this.#cache.delete(request, options);
+  }
+}
+
+export default ExpiringCache;