File Explorer

1'use strict'2 3const { LRUCache } = require('lru-cache')4 5const MEMOIZED = new LRUCache({6  max: 500,7  maxSize: 50 * 1024 * 1024, // 50MB8  ttl: 3 * 60 * 1000, // 3 minutes9  sizeCalculation: (entry, key) => key.startsWith('key:') ? entry.data.length : entry.length,10})11 12module.exports.clearMemoized = clearMemoized13 14function clearMemoized () {15  const old = {}16  MEMOIZED.forEach((v, k) => {17    old[k] = v18  })19  MEMOIZED.clear()20  return old21}22 23module.exports.put = put24 25function put (cache, entry, data, opts) {26  pickMem(opts).set(`key:${cache}:${entry.key}`, { entry, data })27  putDigest(cache, entry.integrity, data, opts)28}29 30module.exports.put.byDigest = putDigest31 32function putDigest (cache, integrity, data, opts) {33  pickMem(opts).set(`digest:${cache}:${integrity}`, data)34}35 36module.exports.get = get37 38function get (cache, key, opts) {39  return pickMem(opts).get(`key:${cache}:${key}`)40}41 42module.exports.get.byDigest = getDigest43 44function getDigest (cache, integrity, opts) {45  return pickMem(opts).get(`digest:${cache}:${integrity}`)46}47 48class ObjProxy {49  constructor (obj) {50    this.obj = obj51  }52 53  get (key) {54    return this.obj[key]55  }56 57  set (key, val) {58    this.obj[key] = val59  }60}61 62function pickMem (opts) {63  if (!opts || !opts.memoize) {64    return MEMOIZED65  } else if (opts.memoize.get && opts.memoize.set) {66    return opts.memoize67  } else if (typeof opts.memoize === 'object') {68    return new ObjProxy(opts.memoize)69  } else {70    return MEMOIZED71  }72}73