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fix: cache 0-prefix validate results only 90s to prevent stale data from RIPE Stat blips

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When RIPE Stat briefly returns empty prefixes, the validateResultCache
was storing this bad result for 15 minutes. Now 0-prefix results expire
after 90 seconds so the next request gets a fresh fetch.

Adds optional ttlMs parameter to resultCacheSet/resultCacheGet for
per-entry TTL control.
This commit is contained in:
Rene Fichtmueller 2026-04-29 22:14:01 +02:00
parent d3611a8169
commit 4cf1673e21
1 changed files with 8 additions and 4 deletions
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12
server.js
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@ -553,12 +553,13 @@ const validateResultCache = new Map();
const RESULT_CACHE_TTL = 15 * 60 * 1000; // 15 minutes
function resultCacheGet(map, key) {
const e = map.get(String(key));
if (e && (Date.now() - e.ts) < RESULT_CACHE_TTL) return e.data;
const ttl = e && e.ttl ? e.ttl : RESULT_CACHE_TTL;
if (e && (Date.now() - e.ts) < ttl) return e.data;
return undefined;
}
function resultCacheSet(map, key, data) {
function resultCacheSet(map, key, data, ttlMs) {
if (map.size > 2000) map.delete(map.keys().next().value);
map.set(String(key), { data, ts: Date.now() });
map.set(String(key), { data, ts: Date.now(), ttl: ttlMs || RESULT_CACHE_TTL });
}
// ============================================================
@ -3372,7 +3373,10 @@ const server = http.createServer(async (req, res) => {
note: "left=upstream providers, right=downstream customers, uncertain=peers. Sorted by power score.",
},
};
resultCacheSet(validateResultCache, rawAsn, validateResult);
// Cache 0-prefix results only briefly (90s) — they may be due to temporary API failures
// Full results with prefixes are cached for the standard 15 minutes
const validateCacheTTL = allPrefixes.length === 0 ? 90 * 1000 : RESULT_CACHE_TTL;
resultCacheSet(validateResultCache, rawAsn, validateResult, validateCacheTTL);
return res.end(JSON.stringify(validateResult, null, 2));
} catch (err) {
res.writeHead(500);