晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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DIR:/lib/node_modules/npm/node_modules/pacote/lib/fetchers/registry/
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Current File : //lib/node_modules/npm/node_modules/pacote/lib/fetchers/registry/packument.js
'use strict'

const BB = require('bluebird')

const fetch = require('npm-registry-fetch')
const LRU = require('lru-cache')
const optCheck = require('../../util/opt-check')

// Corgis are cute. 🐕🐶
const CORGI_DOC = 'application/vnd.npm.install-v1+json; q=1.0, application/json; q=0.8, */*'
const JSON_DOC = 'application/json'

module.exports = packument
function packument (spec, opts) {
  opts = optCheck(opts)

  const registry = fetch.pickRegistry(spec, opts)
  const uri = registry.replace(/\/?$/, '/') + spec.escapedName

  return fetchPackument(uri, registry, spec, opts)
}

const MEMO = new LRU({
  length: m => m._contentLength,
  max: 200 * 1024 * 1024, // 200MB
  maxAge: 30 * 1000 // 30s
})

module.exports.clearMemoized = clearMemoized
function clearMemoized () {
  MEMO.reset()
}

function fetchPackument (uri, registry, spec, opts) {
  const mem = pickMem(opts)
  const accept = opts.fullMetadata ? JSON_DOC : CORGI_DOC
  const memoKey = `${uri}~(${accept})`
  if (mem && !opts.preferOnline && mem.has(memoKey)) {
    return BB.resolve(mem.get(memoKey))
  }

  return fetch(uri, opts.concat({
    headers: {
      'pacote-req-type': 'packument',
      'pacote-pkg-id': `registry:${spec.name}`,
      accept
    },
    spec
  }, opts, {
    // Force integrity to null: we never check integrity hashes for manifests
    integrity: null
  })).then(res => res.json().then(packument => {
    packument._cached = res.headers.has('x-local-cache')
    packument._contentLength = +res.headers.get('content-length')
    // NOTE - we need to call pickMem again because proxy
    //        objects get reused!
    const mem = pickMem(opts)
    if (mem) {
      mem.set(memoKey, packument)
    }
    return packument
  })).catch(err => {
    if (err.code === 'E404' && !opts.fullMetadata) {
      return fetchPackument(uri, registry, spec, opts.concat({
        fullMetadata: true
      }))
    } else {
      throw err
    }
  })
}

class ObjProxy {
  get (key) { return this.obj[key] }
  set (key, val) { this.obj[key] = val }
}

// This object is used synchronously and immediately, so
// we can safely reuse it instead of consing up new ones
const PROX = new ObjProxy()
function pickMem (opts) {
  if (!opts || !opts.memoize) {
    return MEMO
  } else if (opts.memoize.get && opts.memoize.set) {
    return opts.memoize
  } else if (typeof opts.memoize === 'object') {
    PROX.obj = opts.memoize
    return PROX
  } else {
    return null
  }
}