Prewarm card cache in pipeline

src/config.ts

@@ -334,7 +334,7 @@ class Conf {
     /** Link preview cache settings. */
     get linkPreview(): { max: number; ttl: number } {
       return {
-        max: Number(Deno.env.get('DITTO_CACHE_LINK_PREVIEW_MAX') || 1000),
+        max: Number(Deno.env.get('DITTO_CACHE_LINK_PREVIEW_MAX') || 3000),
         ttl: Number(Deno.env.get('DITTO_CACHE_LINK_PREVIEW_TTL') || 12 * 60 * 60 * 1000),
       };
     },

src/pipeline.ts

@@ -19,9 +19,11 @@ import { getAmount } from '@/utils/bolt11.ts';
 import { faviconCache } from '@/utils/favicon.ts';
 import { errorJson } from '@/utils/log.ts';
 import { nip05Cache } from '@/utils/nip05.ts';
+import { parseNoteContent, stripimeta } from '@/utils/note.ts';
 import { purifyEvent } from '@/utils/purify.ts';
 import { updateStats } from '@/utils/stats.ts';
 import { getTagSet } from '@/utils/tags.ts';
+import { unfurlCardCached } from '@/utils/unfurl.ts';
 import { renderWebPushNotification } from '@/views/mastodon/push.ts';
 import { policyWorker } from '@/workers/policy.ts';
 import { verifyEventWorker } from '@/workers/verify.ts';
@@ -122,6 +124,7 @@ async function handleEvent(event: DittoEvent, opts: PipelineOpts): Promise<void>
     Promise.allSettled([
       handleZaps(kysely, event),
       updateAuthorData(event, opts.signal),
+      prewarmLinkPreview(event, opts.signal),
       generateSetEvents(event),
     ])
       .then(() =>
@@ -268,6 +271,13 @@ async function updateAuthorData(event: NostrEvent, signal: AbortSignal): Promise
   }
 }
 
+async function prewarmLinkPreview(event: NostrEvent, signal: AbortSignal): Promise<void> {
+  const { firstUrl } = parseNoteContent(stripimeta(event.content, event.tags), []);
+  if (firstUrl) {
+    await unfurlCardCached(firstUrl, signal);
+  }
+}
+
 /** Determine if the event is being received in a timely manner. */
 function isFresh(event: NostrEvent): boolean {
   return eventAge(event) < Time.minutes(1);

src/views/mastodon/statuses.ts

@@ -46,7 +46,7 @@ async function renderStatus(event: DittoEvent, opts: RenderStatusOpts): Promise<
 
   const [card, relatedEvents] = await Promise
     .all([
-      firstUrl ? unfurlCardCached(firstUrl) : null,
+      firstUrl ? unfurlCardCached(firstUrl, AbortSignal.timeout(500)) : null,
       viewerPubkey
         ? await store.query([
           { kinds: [6], '#e': [event.id], authors: [viewerPubkey], limit: 1 },