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Cache server snapshots for 5 minutes and profiles for an hour

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This commit is contained in:
dtonon 2026-08-20 11:20:04 +01:00
parent 9ab145f816
commit 7883e6df8a
1 changed files with 17 additions and 6 deletions
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23
src/lib/ssr/relay.ts
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@ -8,12 +8,17 @@ import type { Query } from "$lib/forum/query";
// Anonymous relay access for server rendering. The server has no signer, so
// it only ever sees what the relay serves the public; members get their
// private rooms once the client takes over. Every query is bounded so a slow
// relay degrades to an empty page, never a hung request, and results are
// cached briefly to absorb crawler bursts.
// relay degrades to an empty page, never a hung request.
//
// Results are cached in memory. Freshness only matters to crawlers and cold
// refreshes — the browser always refetches live data after hydration — so
// forum data lives as long as the edge cache (CACHE_CONTROL's s-maxage) and
// profiles, which rarely change, for an hour.
const QUERY_TIMEOUT = 2500;
const PROFILE_TIMEOUT = 1500;
const CONNECT_TIMEOUT = 1500;
const CACHE_TTL = 30_000;
const FORUM_TTL = 5 * 60_000;
const PROFILE_TTL = 60 * 60_000;
const DEAD_RELAY_TTL = 5 * 60_000;
const CACHE_MAX = 2000;
@ -89,11 +94,12 @@ function cachedQuery(
relays: string[],
filter: Filter,
maxWait: number,
ttl: number,
): Promise<Event[]> {
const key = relays.join(",") + "|" + JSON.stringify(filter);
const now = Date.now();
const hit = cache.get(key);
if (hit && now - hit.at < CACHE_TTL) return hit.result;
if (hit && now - hit.at < ttl) return hit.result;
if (cache.size >= CACHE_MAX) cache.clear();
const result = boundedQuery(relays, filter, maxWait);
cache.set(key, { at: now, result });
@ -101,9 +107,14 @@ function cachedQuery(
}
export const forumQuery: Query = (filter) =>
cachedQuery([RELAY_URL], filter, QUERY_TIMEOUT);
cachedQuery([RELAY_URL], filter, QUERY_TIMEOUT, FORUM_TTL);
// Profiles mostly live off the forum relay; ask it too for members who only
// published there.
export const profileQuery: Query = (filter) =>
cachedQuery([RELAY_URL, ...PROFILE_RELAYS], filter, PROFILE_TIMEOUT);
cachedQuery(
[RELAY_URL, ...PROFILE_RELAYS],
filter,
PROFILE_TIMEOUT,
PROFILE_TTL,
);