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Code Issues Projects Releases Packages Wiki Activity Actions

factor our cache logic into a separate method

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Hazelnoot 2025-05-19 18:18:55 -04:00
parent 3936807184
commit 3a3f8770d9
1 changed files with 37 additions and 27 deletions
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64
packages/backend/src/server/web/UrlPreviewService.ts
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@ -161,32 +161,8 @@ export class UrlPreviewService {
}
const cacheKey = `${url}@${lang}@${cacheFormatVersion}`;
const cached = await this.previewCache.get(cacheKey);
if (cached !== undefined) {
if (cached.activityPub && !cached.haveNoteLocally) {
// Avoid duplicate checks in case inferActivityPubLink already set this.
const exists = await this.noteExists(cached.activityPub, fetch);
// Remove the AP flag if we encounter a permanent error fetching the note.
if (exists === false) {
cached.activityPub = null;
cached.haveNoteLocally = undefined;
} else {
cached.haveNoteLocally = exists ?? false;
}
// Persist the result once we finalize the result
if (!cached.activityPub || cached.haveNoteLocally) {
await this.previewCache.set(cacheKey, cached);
}
}
// Cache 1 day (matching redis), but not if the note could be fetched later
if (!cached.activityPub || cached.haveNoteLocally) {
reply.header('Cache-Control', 'public, max-age=86400');
}
return reply.code(200).send(cached);
if (await this.sendCachedPreview(cacheKey, reply, fetch)) {
return;
}
try {
@ -233,7 +209,7 @@ export class UrlPreviewService {
// Await this to avoid hammering redis when a bunch of URLs are fetched at once
await this.previewCache.set(cacheKey, summary);
// Cache 1 day (matching redis), but not if the note could be fetched later
// Cache 1 day (matching redis), but only once we finalize the result
if (!summary.activityPub || summary.haveNoteLocally) {
reply.header('Cache-Control', 'public, max-age=86400');
}
@ -253,6 +229,40 @@ export class UrlPreviewService {
}
}
private async sendCachedPreview(cacheKey: string, reply: FastifyReply, fetch: boolean): Promise<boolean> {
const summary = await this.previewCache.get(cacheKey);
if (summary === undefined) {
return false;
}
// Check if note has loaded since we last cached the preview
if (summary.activityPub && !summary.haveNoteLocally) {
// Avoid duplicate checks in case inferActivityPubLink already set this.
const exists = await this.noteExists(summary.activityPub, fetch);
// Remove the AP flag if we encounter a permanent error fetching the note.
if (exists === false) {
summary.activityPub = null;
summary.haveNoteLocally = undefined;
} else {
summary.haveNoteLocally = exists ?? false;
}
// Persist the result once we finalize the result
if (!summary.activityPub || summary.haveNoteLocally) {
await this.previewCache.set(cacheKey, summary);
}
}
// Cache 1 day (matching redis), but only once we finalize the result
if (!summary.activityPub || summary.haveNoteLocally) {
reply.header('Cache-Control', 'public, max-age=86400');
}
reply.code(200).send(summary);
return true;
}
private fetchSummary(url: string, meta: MiMeta, lang?: string): Promise<SummalyResult> {
const agent = this.config.proxy
? {