mirror of
https://github.com/nuxt/nuxt.git
synced 2024-11-23 22:25:12 +00:00
355 lines
11 KiB
JavaScript
355 lines
11 KiB
JavaScript
import ansiHTML from 'ansi-html'
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import serialize from 'serialize-javascript'
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import generateETag from 'etag'
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import fresh from 'fresh'
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import Tapable from 'tappable'
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import pify from 'pify'
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import serveStatic from 'serve-static'
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import compression from 'compression'
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import _ from 'lodash'
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import { resolve, join } from 'path'
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import fs from 'fs-extra'
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import { createBundleRenderer } from 'vue-server-renderer'
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import { getContext, setAnsiColors, encodeHtml } from 'utils'
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import Debug from 'debug'
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const debug = Debug('nuxt:render')
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debug.color = 4 // Force blue color
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setAnsiColors(ansiHTML)
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let jsdom = null
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const parseTemplate = templateStr => _.template(templateStr, {
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interpolate: /{{([\s\S]+?)}}/g
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})
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export default class Renderer extends Tapable {
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constructor (nuxt) {
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super()
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this.nuxt = nuxt
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this.options = nuxt.options
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// Will be set by createRenderer
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this.bundleRenderer = null
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// Will be available on dev
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this.webpackDevMiddleware = null
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this.webpackHotMiddleware = null
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// Renderer runtime resources
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this.resources = {
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clientManifest: null,
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serverBundle: null,
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appTemplate: null,
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errorTemplate: parseTemplate('<pre>{{ stack }}</pre>') // Will be loaded on ready
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}
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// Initialize
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if (nuxt.initialized) {
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// If nuxt already initialized
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this._ready = this.ready().catch(this.nuxt.errorHandler)
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} else {
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// Wait for hook
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this.nuxt.plugin('afterInit', () => {
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this._ready = this.ready()
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return this._ready
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})
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}
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}
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async ready () {
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if (this._ready) {
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return this._ready
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}
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// For serving static/ files to /
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this.serveStatic = pify(serveStatic(resolve(this.options.srcDir, 'static'), this.options.render.static))
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// For serving .nuxt/dist/ files
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this.serveStaticNuxt = pify(serveStatic(resolve(this.options.buildDir, 'dist'), {
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maxAge: (this.options.dev ? 0 : '1y') // 1 year in production
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}))
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// GZIP middleware for production
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if (!this.options.dev && this.options.render.gzip) {
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this.gzipMiddleware = pify(compression(this.options.render.gzip))
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}
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const errorTemplatePath = resolve(this.options.buildDir, 'views/error.html')
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if (fs.existsSync(errorTemplatePath)) {
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this.resources.errorTemplate = parseTemplate(fs.readFileSync(errorTemplatePath, 'utf8'))
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}
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// Load resources from fs
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if (!this.options.dev) {
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await this.loadResources()
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}
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return this
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}
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async loadResources (_fs = fs, isServer) {
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let distPath = resolve(this.options.buildDir, 'dist')
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const resourceMap = {
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clientManifest: {
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path: join(distPath, 'vue-ssr-client-manifest.json'),
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transform: JSON.parse
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},
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serverBundle: {
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path: join(distPath, 'server-bundle.json'),
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transform: JSON.parse
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},
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appTemplate: {
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path: join(distPath, 'index.html'),
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transform: parseTemplate
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}
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}
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let updated = []
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Object.keys(resourceMap).forEach(resourceKey => {
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let { path, transform } = resourceMap[resourceKey]
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let rawKey = '$$' + resourceKey
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let rawData, data
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if (!_fs.existsSync(path)) {
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return // Resource not exists
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}
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rawData = _fs.readFileSync(path, 'utf8')
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if (!rawData || rawData === this.resources[rawKey]) {
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return // No changes
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}
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this.resources[rawKey] = rawData
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data = transform(rawData)
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if (!data) {
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return // Invalid data ?
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}
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this.resources[resourceKey] = data
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updated.push(resourceKey)
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})
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if (updated.length > 0) {
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// debug('Updated', updated.join(', '), isServer)
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this.createRenderer()
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}
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}
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createRenderer () {
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// If resources are not yet provided
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if (!this.resources.serverBundle || !this.resources.clientManifest) {
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return
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}
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// Create bundle renderer for SSR
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this.bundleRenderer = createBundleRenderer(this.resources.serverBundle, Object.assign({
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clientManifest: this.resources.clientManifest,
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runInNewContext: false,
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basedir: this.options.rootDir
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}, this.options.render.ssr))
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// Promisify renderToString
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this.bundleRenderer.renderToString = pify(this.bundleRenderer.renderToString)
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}
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async render (req, res) {
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// Get context
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const context = getContext(req, res)
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res.statusCode = 200
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try {
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// Gzip middleware for production
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if (this.gzipMiddleware) {
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await this.gzipMiddleware(req, res)
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}
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// If base in req.url, remove it for the middleware and vue-router
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if (this.options.router.base !== '/' && req.url.indexOf(this.options.router.base) === 0) {
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// Compatibility with base url for dev server
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req.url = req.url.replace(this.options.router.base, '/')
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}
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// Call webpack middleware only in development
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if (this.webpackDevMiddleware) {
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await this.webpackDevMiddleware(req, res)
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}
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if (this.webpackHotMiddleware) {
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await this.webpackHotMiddleware(req, res)
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}
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// Serve static/ files
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await this.serveStatic(req, res)
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// Serve .nuxt/dist/ files (only for production)
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const isValidExtension = (req.url.slice(-3) === '.js') || (req.url.slice(-4) === '.css') || (req.url.slice(-4) === '.map')
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if (!this.options.dev && isValidExtension) {
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const url = req.url
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if (req.url.indexOf(this.options.build.publicPath) === 0) {
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req.url = req.url.replace(this.options.build.publicPath, '/')
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}
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await this.serveStaticNuxt(req, res)
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/* istanbul ignore next */
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req.url = url
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}
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if (this.options.dev && req.url.indexOf(this.options.build.publicPath) === 0 && req.url.includes('.hot-update.json')) {
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res.statusCode = 404
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return res.end()
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}
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const { html, error, redirected, resourceHints } = await this.renderRoute(req.url, context)
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if (redirected) {
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return html
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}
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if (error) {
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res.statusCode = context.nuxt.error.statusCode || 500
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}
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// ETag header
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if (!error && this.options.render.etag) {
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const etag = generateETag(html, this.options.render.etag)
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if (fresh(req.headers, { etag })) {
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res.statusCode = 304
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res.end()
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return
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}
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res.setHeader('ETag', etag)
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}
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// HTTP2 push headers
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if (!error && this.options.render.http2.push) {
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// Parse resourceHints to extract HTTP.2 prefetch/push headers
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// https://w3c.github.io/preload/#server-push-http-2
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const regex = /link rel="([^"]*)" href="([^"]*)" as="([^"]*)"/g
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const pushAssets = []
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let m
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while (m = regex.exec(resourceHints)) { // eslint-disable-line no-cond-assign
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const [_, rel, href, as] = m // eslint-disable-line no-unused-vars
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if (rel === 'preload') {
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pushAssets.push(`<${href}>; rel=${rel}; as=${as}`)
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}
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}
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// Pass with single Link header
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// https://blog.cloudflare.com/http-2-server-push-with-multiple-assets-per-link-header
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res.setHeader('Link', pushAssets.join(','))
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}
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// Send response
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res.setHeader('Content-Type', 'text/html; charset=utf-8')
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res.setHeader('Content-Length', Buffer.byteLength(html))
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res.end(html, 'utf8')
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return html
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} catch (err) {
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/* istanbul ignore if */
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if (context.redirected) {
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console.error(err) // eslint-disable-line no-console
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return err
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}
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// Render error template
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const html = this.resources.errorTemplate({
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/* istanbul ignore if */
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error: err,
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stack: ansiHTML(encodeHtml(err.stack))
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})
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// Send response
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res.statusCode = 500
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res.setHeader('Content-Type', 'text/html; charset=utf-8')
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res.setHeader('Content-Length', Buffer.byteLength(html))
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res.end(html, 'utf8')
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return err
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}
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}
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async renderRoute (url, context = {}) {
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/* istanbul ignore if */
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if (!this.bundleRenderer || !this.resources.appTemplate) {
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return new Promise(resolve => {
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setTimeout(() => resolve(this.renderRoute(url, context)), 1000)
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})
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}
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// Log rendered url
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debug(`Rendering url ${url}`)
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// Add url and isSever to the context
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context.url = url
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context.isServer = true
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// Call renderToString from the bundleRenderer and generate the HTML (will update the context as well)
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let APP = await this.bundleRenderer.renderToString(context)
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if (!context.nuxt.serverRendered) {
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APP = '<div id="__nuxt"></div>'
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}
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const m = context.meta.inject()
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let HEAD = m.meta.text() + m.title.text() + m.link.text() + m.style.text() + m.script.text() + m.noscript.text()
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if (this.options._routerBaseSpecified) {
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HEAD += `<base href="${this.options.router.base}">`
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}
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const resourceHints = context.renderResourceHints()
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HEAD += resourceHints + context.renderStyles()
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APP += `<script type="text/javascript">window.__NUXT__=${serialize(context.nuxt, { isJSON: true })}</script>`
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APP += context.renderScripts()
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const html = this.resources.appTemplate({
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HTML_ATTRS: 'data-n-head-ssr ' + m.htmlAttrs.text(),
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BODY_ATTRS: m.bodyAttrs.text(),
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HEAD,
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APP
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})
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return {
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html,
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resourceHints,
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error: context.nuxt.error,
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redirected: context.redirected
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}
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}
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async renderAndGetWindow (url, opts = {}) {
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/* istanbul ignore if */
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if (!jsdom) {
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try {
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jsdom = require('jsdom')
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} catch (e) /* istanbul ignore next */ {
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console.error('Fail when calling nuxt.renderAndGetWindow(url)') // eslint-disable-line no-console
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console.error('jsdom module is not installed') // eslint-disable-line no-console
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console.error('Please install jsdom with: npm install --save-dev jsdom') // eslint-disable-line no-console
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throw e
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}
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}
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let options = {
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resources: 'usable', // load subresources (https://github.com/tmpvar/jsdom#loading-subresources)
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runScripts: 'dangerously',
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beforeParse (window) {
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// Mock window.scrollTo
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window.scrollTo = () => {
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}
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}
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}
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if (opts.virtualConsole !== false) {
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options.virtualConsole = new jsdom.VirtualConsole().sendTo(console)
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}
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url = url || 'http://localhost:3000'
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const { window } = await jsdom.JSDOM.fromURL(url, options)
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// If Nuxt could not be loaded (error from the server-side)
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const nuxtExists = window.document.body.innerHTML.includes('window.__NUXT__')
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if (!nuxtExists) {
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/* istanbul ignore next */
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let error = new Error('Could not load the nuxt app')
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/* istanbul ignore next */
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error.body = window.document.body.innerHTML
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throw error
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}
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// Used by nuxt.js to say when the components are loaded and the app ready
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await new Promise((resolve) => {
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window._onNuxtLoaded = () => resolve(window)
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})
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// Send back window object
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return window
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}
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}
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