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'use strict' const { LRUCache } = require('lru-cache') const dns = require('dns') // this is a factory so that each request can have its own opts (i.e. ttl) // while still sharing the cache across all requests const cache = new LRUCache({ max: 50 }) const getOptions = ({ family = 0, hints = dns.ADDRCONFIG, all = false, verbatim = undefined, ttl = 5 * 60 * 1000, lookup = dns.lookup, }) => ({ // hints and lookup are returned since both are top level properties to (net|tls).connect hints, lookup: (hostname, ...args) => { const callback = args.pop() // callback is always last arg const lookupOptions = args[0] ?? {} const options = { family, hints, all, verbatim, ...(typeof lookupOptions === 'number' ? { family: lookupOptions } : lookupOptions), } const key = JSON.stringify({ hostname, ...options }) if (cache.has(key)) { const cached = cache.get(key) return process.nextTick(callback, null, ...cached) } lookup(hostname, options, (err, ...result) => { if (err) { return callback(err) } cache.set(key, result, { ttl }) return callback(null, ...result) }) }, }) module.exports = { cache, getOptions, }