openhands
203399aab7
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The in-process cache was a FIFO of 500 entries that was never touched on a read, so a key polled on every request could be evicted by an unrelated burst of dynamic keys. That looked exactly like the cache being cleared at random, and it is what made the site fall back to the database unpredictably. - Evict least-recently-used instead, and raise the default budget to 2000 (CACHE_MEMORY_MAX_ENTRIES). Reading a key now marks it as used, so a hot key only leaves when a hotter one takes its place. - Add opt-in stale-while-revalidate (CachedOptions.staleMs). The grace window lives on the entry, so one call site opting in protects every reader of that key. A failed background refresh keeps serving the last good value instead of falling through to the origin, and is reported once rather than per read. - Invalidate across processes. invalidateKey() now clears memory, deletes the Redis key and publishes a signal, so a value written by one process is no longer served stale by the others for the rest of its TTL. A failed Redis delete no longer skips the broadcast. - Guard against a refresh that started before an invalidation writing its outdated result back into the cache. - Read the news revision at most once a second per process instead of on every call, with a pub/sub signal to drop the local copy when it rotates. A Redis outage now degrades to the in-process cache rather than to no cache at all. - Warm the hot public keys on boot, so the first visitors after a deploy do not each pay for a miss. - Count hits, misses, stale serves, errors and evictions per key, exposed at GET /api/admin/devops/cache. Without it a wrong REDIS_URL, a full budget and a dead origin all look identical from the outside. - Enforce the imaging cache budget for real: records are .img/.json pairs, so the old cap counted files and never removed anything while entries were fresh. Sweeps are throttled per directory and prune to a low-water mark. - Cap the JWT version map, and stop per-test scratch roots from littering the runtime imaging cache. Public read-only endpoints get grace windows; admin, account and auth data deliberately stays fresh. Redis TTLs get a little jitter so keys written together no longer expire together. 3209 tests pass. next build could not be verified on this host: the optimized build is OOM-killed before prerender, so this has not run in a real Next runtime yet.
50 lines
1.4 KiB
TypeScript
50 lines
1.4 KiB
TypeScript
import { eq } from "drizzle-orm";
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import { apiJson } from "@/lib/api";
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import { db, User } from "@/lib/db";
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import { apiCacheKey, redisCache } from "@/lib/redis-cache";
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import { siteSettings } from "@/lib/services/site-settings";
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// Current on-air DJ. The DJ is set manually via the radio_current_dj_id setting
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// (Manual DJ user ID). When set, resolve that user's username/look; otherwise
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// there is no DJ on air. Mirrors the AtomCMS radio "on air" widget.
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// The radio widget polls this endpoint frequently — a short cache avoids a DB
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// hit per poll. The DJ only changes when a moderator switches it manually.
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const GET_TTL_SECONDS = 5;
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export async function GET(_req: Request) {
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try {
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const dj = await redisCache(
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apiCacheKey("radio:current-dj"),
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GET_TTL_SECONDS,
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async () => {
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const raw = await siteSettings.get("radio_current_dj_id", "");
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const id = Number(raw);
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// No DJ configured (empty / non-numeric / zero).
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if (!raw || !Number.isFinite(id) || id <= 0) {
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return null;
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}
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const [user] = await db
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.select({ username: User.username, look: User.look })
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.from(User)
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.where(eq(User.id, id))
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.limit(1);
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if (!user) {
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return null;
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}
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return { username: user.username, look: user.look };
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},
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{ staleMs: 30_000 },
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);
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return apiJson({ dj });
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} catch {
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// DB / settings unavailable — no DJ rather than a 500.
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return apiJson({ dj: null }, { status: 200 });
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}
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}
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