Fix trends cache

src/app.ts

@@ -194,12 +194,8 @@ app.get('/api/v2/search', searchController);
 
 app.get('/api/pleroma/frontend_configurations', frontendConfigController);
 
-app.get(
-  '/api/v1/trends/tags',
-  cacheMiddleware({ cacheName: 'web', expires: Time.minutes(15) }),
-  trendingTagsController,
-);
-app.get('/api/v1/trends', cacheMiddleware({ cacheName: 'web', expires: Time.minutes(15) }), trendingTagsController);
+app.get('/api/v1/trends/tags', trendingTagsController);
+app.get('/api/v1/trends', trendingTagsController);
 
 app.get('/api/v1/suggestions', suggestionsV1Controller);
 app.get('/api/v2/suggestions', suggestionsV2Controller);

src/controllers/api/trends.ts

@@ -10,10 +10,20 @@ await TrendsWorker.open('data/trends.sqlite3');
 
 const limitSchema = z.coerce.number().catch(10).transform((value) => Math.min(Math.max(value, 0), 20));
 
+let cache = getTrends();
+
+Deno.cron('update trends cache', { minute: { every: 15 } }, async () => {
+  const trends = await getTrends();
+  cache = Promise.resolve(trends);
+});
+
 const trendingTagsController: AppController = async (c) => {
   const limit = limitSchema.parse(c.req.query('limit'));
-  if (limit < 1) return c.json([]);
+  const trends = await cache;
+  return c.json(trends.slice(0, limit));
+};
 
+async function getTrends() {
   const now = new Date();
   const yesterday = new Date(now.getTime() - Time.days(1));
   const lastWeek = new Date(now.getTime() - Time.days(7));
@@ -22,11 +32,10 @@ const trendingTagsController: AppController = async (c) => {
   const tags = await TrendsWorker.getTrendingTags({
     since: yesterday,
     until: now,
-    limit,
+    limit: 20,
   });
 
-  return c.json(
-    await Promise.all(tags.map(async ({ tag, uses, accounts }) => ({
+  return Promise.all(tags.map(async ({ tag, uses, accounts }) => ({
     name: tag,
     url: Conf.local(`/tags/${tag}`),
     history: [
@@ -50,8 +59,7 @@ const trendingTagsController: AppController = async (c) => {
         uses: String(history.uses),
       })),
     ],
-    }))),
-  );
-};
+  })));
+}
 
 export { trendingTagsController };