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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,49 @@ | ||
const LRUCache = require('lru-cache') | ||
const dns = require('dns') | ||
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const defaultOptions = exports.defaultOptions = { | ||
family: undefined, | ||
hints: dns.ADDRCONFIG, | ||
all: false, | ||
verbatim: true, | ||
} | ||
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const lookupCache = exports.lookupCache = new LRUCache({ max: 50 }) | ||
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// this is a factory so that each request can have its own opts (i.e. ttl) | ||
// while still sharing the cache across all requests | ||
exports.getLookup = (dnsOptions) => { | ||
return (hostname, options, callback) => { | ||
if (typeof options === 'function') { | ||
callback = options | ||
options = null | ||
} else if (typeof options === 'number') { | ||
options = { family: options } | ||
} | ||
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options = { ...defaultOptions, ...options } | ||
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const key = JSON.stringify({ | ||
hostname, | ||
family: options.family, | ||
hints: options.hints, | ||
all: options.all, | ||
verbatim: options.verbatim, | ||
}) | ||
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if (lookupCache.has(key)) { | ||
const [address, family] = lookupCache.get(key) | ||
process.nextTick(callback, null, address, family) | ||
return | ||
} | ||
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dnsOptions.lookup(hostname, options, (err, address, family) => { | ||
if (err) { | ||
return callback(err) | ||
} | ||
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lookupCache.set(key, [address, family], { ttl: dnsOptions.ttl }) | ||
return callback(null, address, family) | ||
}) | ||
} | ||
} |
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