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