38 lines
940 B
JavaScript
38 lines
940 B
JavaScript
import fs from "fs";
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import path from "path";
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import { LRUCache } from "lru-cache";
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let maxKeys = 10_000;
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let cache = makeCache(maxKeys);
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function makeCache(maxEntries) {
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return new LRUCache({
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maxSize: maxEntries,
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ttl: 60_000,
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allowStale: false,
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updateAgeOnGet: false,
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updateAgeOnHas: false
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});
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}
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function scaleCache() {
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const { heapUsed, heapTotal } = process.memoryUsage();
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const freeHeapRatio = (heapTotal - heapUsed) / heapTotal;
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const newMax = freeHeapRatio > 0.5 ? 20_000 : freeHeapRatio < 0.2 ? 5_000 : 10_000;
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if (newMax !== maxKeys) {
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maxKeys = newMax;
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cache = makeCache(maxKeys);
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console.log(`[SCALER] freeHeap ${((heapTotal - heapUsed) / 1e6).toFixed(1)}MB → maxKeys: ${maxKeys}`);
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}
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}
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setInterval(scaleCache, 60_000);
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scaleCache();
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const watchPath = path.join(process.cwd(), "public");
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fs.watch(watchPath, { recursive: true }, () => {
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cache.clear();
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});
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export { cache };
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