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2 years ago
'use strict'
const LRU = require('lru-cache')
const MAX_SIZE = 50 * 1024 * 1024 // 50MB
const MAX_AGE = 3 * 60 * 1000
const MEMOIZED = new LRU({
max: MAX_SIZE,
maxAge: MAX_AGE,
length: (entry, key) => key.startsWith('key:') ? entry.data.length : 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
}