const LRU = require('lru-cache')
const microCache = LRU({
 max: 100, // 最大緩存的數(shù)目
 maxAge: 1000 // 重要提示：條目在 1 秒后過(guò)期。
})
const isCacheable = req => {
 //判斷是否需要頁(yè)面緩存
　　if (req.url && req.url === '/') {
 　　 return req.url
　　} else {
 　　return false
　　}
}
app.get('*', (req, res) => {
const cacheable = isCacheable(req)
　　if (cacheable) {
　　　　const hit = microCache.get(req.url)
 　　　　if (hit) {
  　　return res.end(hit)
　　}
　}
const errorHandler = err => {
 if (err && err.code === 404) {
  // 未找到頁(yè)面
  res.status(404).sendfile('public/404.html');
 } else {
  // 頁(yè)面渲染錯(cuò)誤
  res.status(500).end('500 - Internal Server Error')
  console.error(`error during render : ${req.url}`)
  console.error(err)
 }
}
const context = {
 title: 'vue',
 keywords: 'vue-ssr服務(wù)端腳手架',
 description: 'vue-ssr-template, vue-server-renderer',
 version: v,
 url: req.url,
 cookies: req.cookies
}
renderer.renderToString(context, (err, html) => {
 if (err) {
  return errorHandler(err)
 }
 res.end(html)
 microCache.set(req.url, html) // 設(shè)置當(dāng)前緩存頁(yè)面的內(nèi)容
})
})

function createRenderer(bundle, template) {
 return require('vue-server-renderer').createBundleRenderer(bundle, {
  template,
  cache: LRU({
   max: 1000,
   maxAge: 1000 * 60 * 5 // 組建緩存時(shí)間
  })
 })
}
let renderer
if (isProd) {
 // 生產(chǎn)環(huán)境使用本地打包文件來(lái)渲染
 const bundle = require('./output/vue-ssr-bundle.json')
 const template = fs.readFileSync(resolve('./output/index.html'), 'utf-8')
 renderer = createRenderer(bundle, template)
} else {
 // 開(kāi)發(fā)環(huán)境使用webpack熱更新服務(wù)
 require('./build/dev-server')(app, (bundle, template) => {
  renderer = createRenderer(bundle, template)
 })
}

export default {
 name: 'Home',
 title() {
  return {
   title: 'vue-ssr',
   keywords: 'vue-ssr服務(wù)端腳手架, home',
   description: 'vue-ssr-template, vue-server-renderer, home'
  }
 },
 created() {
 },
 computed: {},
 asyncData({ store }) {},
 methods: {},
 serverCacheKey: props => props.id
}

import qs from 'qs'
import axios from 'axios'
import md5 from 'md5'
import LRU from 'lru-cache'
const microCache = LRU({ 
　　max: 100,
　　maxAge: 5000 // 設(shè)置數(shù)據(jù)多久過(guò)期
})
export function createAPI({baseUrl, timeout}) {
let api
if (process.__API__) { api = process.__API__ } else {
// 定義全局變量 process.__API__
  api = process.__API__ = {
   get(url, params = {}) {
    const key = md5(url + JSON.stringify(params))
    // 判斷是否有緩存,直接返回緩存結(jié)果
    if (params.cache && microCache.get(key)) {
     console.log('返回緩存')
     return Promise.resolve(microCache.get(key))
    }
    return new Promise((resolve, reject) => {
     axios({
      url,
      params,
      headers: {
       'X-Requested-With': 'XMLHttpRequest'
       // 'Cookie': parseCookie(SSR.cookies)
      },
      method: 'get'
     }).then(res => {
      // 判斷是否需要緩存 如果需要緩存緩存數(shù)據(jù)
      if (params.cache && microCache) {
       microCache.set(key, res.data)
      }
      console.log('返回新數(shù)據(jù)')
      resolve(res.data)
     }).catch(error => {
      reject(error)
     })
    })
   },
   post(url, params = {}) {
    const key = md5(url + JSON.stringify(params))
    // 判斷是否有緩存,直接返回緩存結(jié)果
    if (params.cache && microCache.get(key)) {
     return Promise.resolve(microCache.get(key))
    }
    return new Promise((resolve, reject) => {
     axios({
      url,
      data: qs.stringify(params),
      method: 'post',
      headers: {
       'X-Requested-With': 'XMLHttpRequest',
       'Content-Type': 'application/x-www-form-urlencoded'
       // 'Cookie': parseCookie(SSR.cookies)
      }
     }).then(res => {
      // 判斷是否需要緩存 如果需要緩存緩存數(shù)據(jù)
      if (params.cache && microCache) {
       microCache.set(key, res.data)
      }
      resolve(res.data)
     }).catch(error => {
      reject(error)
     })
    })
   }
  }
 }
return api
}