'use strict'
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const LRU = require('lru-cache')
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const MAX_SIZE = 50 * 1024 * 1024 // 50MB
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const MAX_AGE = 3 * 60 * 1000
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let MEMOIZED = new LRU({
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max: MAX_SIZE,
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maxAge: MAX_AGE,
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length: (entry, key) => {
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if (key.startsWith('key:')) {
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return entry.data.length
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} else if (key.startsWith('digest:')) {
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return entry.length
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}
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}
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})
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module.exports.clearMemoized = clearMemoized
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function clearMemoized () {
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const old = {}
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MEMOIZED.forEach((v, k) => {
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old[k] = v
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})
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MEMOIZED.reset()
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return old
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}
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module.exports.put = put
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function put (cache, entry, data, opts) {
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pickMem(opts).set(`key:${cache}:${entry.key}`, { entry, data })
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putDigest(cache, entry.integrity, data, opts)
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}
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module.exports.put.byDigest = putDigest
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function putDigest (cache, integrity, data, opts) {
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pickMem(opts).set(`digest:${cache}:${integrity}`, data)
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}
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module.exports.get = get
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function get (cache, key, opts) {
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return pickMem(opts).get(`key:${cache}:${key}`)
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}
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module.exports.get.byDigest = getDigest
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function getDigest (cache, integrity, opts) {
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return pickMem(opts).get(`digest:${cache}:${integrity}`)
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}
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class ObjProxy {
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constructor (obj) {
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this.obj = obj
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}
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get (key) { return this.obj[key] }
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set (key, val) { this.obj[key] = val }
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}
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function pickMem (opts) {
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if (!opts || !opts.memoize) {
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return MEMOIZED
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} else if (opts.memoize.get && opts.memoize.set) {
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return opts.memoize
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} else if (typeof opts.memoize === 'object') {
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return new ObjProxy(opts.memoize)
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} else {
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return MEMOIZED
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}
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}
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