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server.js
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server.js
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const fs = require('fs')
const path = require('path')
const Koa = require('koa2')
const KoaRuoter = require('koa-router')
const KoaServe = require('./build/serve')
const serialize = require('serialize-javascript')
const resolve = file => path.resolve(__dirname, file)
const isProd = process.env.NODE_ENV === 'production'
const serverInfo = `koa2/${require('koa2/package.json').version}` +
`vue-server-renderer/${require('vue-server-renderer/package.json').version}`
const app = new Koa()
const router = new KoaRuoter()
const api_router = new KoaRuoter()
const serve = (url, path, cache) => KoaServe(url, {
root: resolve(path),
maxAge: cache && isProd ? 60 * 60 * 24 * 30 : 0
})
// 模拟api
app.use(serve('/api/topstories.json', './public/api/topstories.json'))
app.use(serve('/api/newstories.json', './public/api/newstories.json'))
api_router.get('/api/item/:id.json', (ctx, next) => {
const id = ctx.params.id
const time = parseInt(Math.random()*(1487396700-1400000000+1)+1400000000)
const item = {
by: "zero" + id,
descendants: 0,
id: id,
score: id - 13664000,
time: time,
title: `测试Item:${id} - ${time}`,
type: 'story',
url: `/api/item/${id}.json`
}
ctx.body = item
})
app.use(api_router.routes()).use(api_router.allowedMethods())
let indexHTML
let renderer
if (isProd) {
renderer = createRenderer(fs.readFileSync(resolve('./dist/server-bundle.js'), 'utf-8'))
indexHTML = parseIndex(fs.readFileSync(resolve('./dist/index.html'), 'utf-8'))
} else {
require('./build/setup-dev-server')(app, {
bundleUpdated: bundle => {
renderer = createRenderer(bundle)
},
indexUpdated: index => {
indexHTML = parseIndex(index)
}
})
}
function createRenderer (bundle) {
return require('vue-server-renderer').createBundleRenderer(bundle, {
cache: require('lru-cache')({
max: 1000,
maxAge: 1000 * 60 * 15
})
})
}
function parseIndex (template) {
const contentMarker = '<!-- APP -->'
const i = template.indexOf(contentMarker)
return {
head: template.slice(0, i),
tail: template.slice(i + contentMarker.length)
}
}
// 加载和设置static
//app.use(compression({ threshold: 0}))
//app.use(favicon('./public/logo-48.png'))
app.use(serve('/service-worker.js', './dist/servivce-worker.js'))
app.use(serve('/dist', './dist'))
app.use(serve('/public', './public'))
// historyApiFallback and ssr
router.get('*', (ctx, next) => {
if (!renderer) {
return ctx.body ='waiting for compilation.. refresh in a moment.'
}
ctx.set("Content-Type", "text/html")
ctx.set("Server", serverInfo)
const s = Date.now()
const context = { url: ctx.url }
const renderStream = renderer.renderToStream(context)
const res = ctx.res
return new Promise(function(resolve){
renderStream.once('data', () => {
res.statusCode = 200
res.write(indexHTML.head)
})
renderStream.on('data', chunk => {
res.write(chunk)
})
renderStream.on('end', () => {
if (context.initialState) {
res.write(
`<script>window.__INSTAL_STATE__=${
serialize(context.initialState)
}</script>`
)
}
res.end(indexHTML.tail)
resolve()
console.log(`whole request: ${Date.now() - s}ms`)
})
renderStream.on('error', err => {
if (err && err.code === '404') {
res.statusCode = 404
res.end('404 | Page Not Found')
resolve()
return
}
res.statusCode = 500
res.end('Internal Error 500')
resolve()
console.error(`error during render : ${ctx.url}`)
console.error(err)
})
})
})
app.use(router.routes()).use(router.allowedMethods())
const port = process.env.PORT || 8089
app.listen(port, () => {
console.log(`server started at localhost:${port}`)
})