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next.js/server/render.js

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import { join } from 'path'
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import { createElement } from 'react'
import { renderToString, renderToStaticMarkup } from 'react-dom/server'
import send from 'send'
import generateETag from 'etag'
import fresh from 'fresh'
import requirePage from './require'
import { Router } from '../lib/router'
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import { loadGetInitialProps, isResSent } from '../lib/utils'
import { getAvailableChunks } from './utils'
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import Head, { defaultHead } from '../lib/head'
import ErrorDebug from '../lib/error-debug'
import { flushChunks } from '../lib/dynamic'
import { BUILD_MANIFEST } from '../lib/constants'
const logger = console
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export async function render (req, res, pathname, query, opts) {
const html = await renderToHTML(req, res, pathname, query, opts)
sendHTML(req, res, html, req.method, opts)
}
export function renderToHTML (req, res, pathname, query, opts) {
return doRender(req, res, pathname, query, opts)
}
export async function renderError (err, req, res, pathname, query, opts) {
const html = await renderErrorToHTML(err, req, res, query, opts)
sendHTML(req, res, html, req.method, opts)
}
export function renderErrorToHTML (err, req, res, pathname, query, opts = {}) {
return doRender(req, res, pathname, query, { ...opts, err, page: '/_error' })
}
async function doRender (req, res, pathname, query, {
err,
page,
buildId,
hotReloader,
assetPrefix,
runtimeConfig,
availableChunks,
dist,
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dir = process.cwd(),
dev = false,
staticMarkup = false,
nextExport = false
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} = {}) {
page = page || pathname
if (hotReloader) { // In dev mode we use on demand entries to compile the page before rendering
await ensurePage(page, { dir, hotReloader })
}
Universal Webpack (#3578) * Speed up next build * Document webpack config * Speed up next build * Remove comment * Add comment * Clean up rules * Add comments * Run in parallel * Push plugins seperately * Create a new chunk for react * Don’t uglify react since it’s already uglified. Move react to commons in development * Use the minified version directly * Re-add globpattern * Move loaders into a separate variable * Add comment linking to Dan’s explanation * Remove dot * Add universal webpack * Initial dev support * Fix linting * Add changes from Arunoda's work * Made next dev works. But super slow and no HMR support. * Fix client side hot reload * Server side hmr * Only in dev * Add on-demand-entries client + hot-middleware * Add .babelrc support * Speed up on demand entries by running in parallel * Serve static generated files * Add missing config in dev * Add sass support * Add support for .map * Add cssloader config and fix .jsx support * Rename * use same defaults as css-loader. Fix linting * Add NoEmitErrorsPlugin * Add clientBootstrap * Use webpackhotmiddleware on the multi compiler * alpha.3 * Use babel 16.2.x * Fix reloading after error * Remove comment * Release 5.0.0-univeral-alpha.1 * Remove check for React 16 * Release 5.0.0-universal-alpha.2 * React hot loader v4 * Use our static file rendering machanism to serve pages. This should work well since the file path for a page is predictable. * Release 5.0.0-universal-alpha.3 * Remove optional loaders * Release 5.0.0-universal-alpha.4 * Remove clientBootstrap * Remove renderScript * Make sure pages bundles are served correctly * Remove unused import * Revert to using the same code as canary * Fix hot loader * Release 5.0.0-universal-alpha.5 * Check if externals dir exist before applying config * Add typescript support * Add support for transpiling certain packages in node_modules Thanks to @giuseppeg’s work in https://github.com/zeit/next.js/pull/3319 * Add BABEL_DISABLE_CACHE support * Make sourcemaps in production opt-in * Revert "Add support for transpiling certain packages in node_modules" This reverts commit d4b1d9babfb4b9ed4f4b12d56d52dee233e862da. In favor of a better api around this. * Support typescript through next.config.js * Remove comments * Bring back commons.js calculation * Remove unused dependencies * Move base.config.js to webpack.js * Make sure to only invalidate webpackDevMiddleware one after other. * Allow babel-loder caching by default. * Add comment about preact support * Bring back buildir replace * Remove obsolete plugin * Remove build replace, speed up build * Resolve page entries like pages/day/index.js to pages/day.js * Add componentDidCatch back * Compile to bundles * Use config.distDir everywhere * Make sure the file is an array * Remove console.log * Apply optimization to uglifyjs * Add comment pointing to source * Create entries the same way in dev and production * Remove unused and broken pagesGlobPattern * day/index.js is automatically turned into day.js at build time * Remove poweredByHeader option * Load pages with the correct path. * Release 5.0.0-universal-alpha.6 * Make sure react-dom/server can be overwritten by module-alias * Only add react-hot-loader babel plugin in dev * Release 5.0.0-universal-alpha.7 * Revert tests * Release 5.0.0-universal-alpha.10 * Make sure next/head is working properly. * Add wepack alias for 'next' back. * Make sure overriding className in next/head works * Alias react too * Add missing r * Fragment fallback has to wrap the children * Use min.js * Remove css.js * Remove wallaby.js * Release 5.0.0-universal-alpha.11 * Resolve relative to workdir instead of next * Make sure we touch the right file * Resolve next modules * Remove dotjsx removal plugins since we use webpack on the server * Revert "Resolve relative to workdir instead of next" This reverts commit a13f3e4ab565df9e2c9a3dfc8eb4009c0c2e02ed. * Externalize any locally loaded module lives outside of app dir. * Remove server aliases * Check node_modules reliably * Add symlink to next for tests * Make sure dynamic imports work locally. This is why we need it: https://github.com/webpack/webpack/blob/b545b519b2024e3f8be3041385bd326bf5d24449/lib/MainTemplate.js#L68 We need to have the finally clause in the above in __webpack_require__. webpack output option strictModuleExceptionHandling does that. * dynmaic -> dynamic * Remove webpack-node-externals * Make sure dynamic imports support SSR. * Remove css support in favor of next-css * Make sure we load path from `/` since it’s included in the path matching * Catch when ensurepage couldn’t be fulfilled for `.js.map` * Register require cache flusher for both client and server * Add comment explaining this is to facilitate hot reloading * Only load module when needed * Remove unused modules * Release 5.0.0-universal-alpha.12 * Only log the `found babel` message once * Make sure ondemand entries working correctly. Now we are just using a single instance of OnDemandEntryHandler. * Better sourcemaps * Release 5.0.0-universal-alpha.13 * Lock uglify version to 1.1.6 * Release 5.0.0-universal-alpha.14 * Fix a typo. * Introduce multi-zones support for mircofrontends * Add section on css
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const documentPath = join(dir, dist, 'dist', 'bundles', 'pages', '_document')
const appPath = join(dir, dist, 'dist', 'bundles', 'pages', '_app')
const buildManifest = require(join(dir, dist, BUILD_MANIFEST))
let [Component, Document, App] = await Promise.all([
requirePage(page, {dir, dist}),
require(documentPath),
require(appPath)
])
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Component = Component.default || Component
if (typeof Component !== 'function') {
throw new Error(`The default export is not a React Component in page: "${pathname}"`)
}
App = App.default || App
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Document = Document.default || Document
const asPath = req.url
const ctx = { err, req, res, pathname, query, asPath }
const router = new Router(pathname, query, asPath)
const props = await loadGetInitialProps(App, {Component, router, ctx})
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// the response might be finshed on the getinitialprops call
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if (isResSent(res)) return
const renderPage = (enhancer = Page => Page) => {
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const app = createElement(App, {
Component: enhancer(Component),
router,
...props
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})
const render = staticMarkup ? renderToStaticMarkup : renderToString
let html
let head
let errorHtml = ''
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try {
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if (err && dev) {
errorHtml = render(createElement(ErrorDebug, { error: err }))
} else if (err) {
errorHtml = render(app)
} else {
html = render(app)
}
} finally {
head = Head.rewind() || defaultHead()
}
const chunks = loadChunks({ dev, dir, dist, availableChunks })
return { html, head, errorHtml, chunks, buildManifest }
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}
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const docProps = await loadGetInitialProps(Document, { ...ctx, renderPage })
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if (isResSent(res)) return
if (!Document.prototype || !Document.prototype.isReactComponent) throw new Error('_document.js is not exporting a React element')
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const doc = createElement(Document, {
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__NEXT_DATA__: {
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props,
page, // the rendered page
pathname, // the requested path
query,
buildId,
assetPrefix,
runtimeConfig,
nextExport,
err: (err) ? serializeError(dev, err) : null
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},
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dev,
dir,
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staticMarkup,
buildManifest,
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...docProps
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})
return '<!DOCTYPE html>' + renderToStaticMarkup(doc)
}
export async function renderScriptError (req, res, page, error) {
// Asks CDNs and others to not to cache the errored page
res.setHeader('Cache-Control', 'no-store, must-revalidate')
if (error.code === 'ENOENT' || error.message === 'INVALID_BUILD_ID') {
res.statusCode = 404
res.end('404 - Not Found')
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return
}
logger.error(error.stack)
res.statusCode = 500
res.end('500 - Internal Error')
}
export function sendHTML (req, res, html, method, { dev, generateEtags }) {
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if (isResSent(res)) return
const etag = generateEtags && generateETag(html)
if (fresh(req.headers, { etag })) {
res.statusCode = 304
res.end()
return
}
if (dev) {
// In dev, we should not cache pages for any reason.
// That's why we do this.
res.setHeader('Cache-Control', 'no-store, must-revalidate')
}
if (etag) {
res.setHeader('ETag', etag)
}
if (!res.getHeader('Content-Type')) {
res.setHeader('Content-Type', 'text/html; charset=utf-8')
}
res.setHeader('Content-Length', Buffer.byteLength(html))
res.end(method === 'HEAD' ? null : html)
}
export function sendJSON (res, obj, method) {
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if (isResSent(res)) return
const json = JSON.stringify(obj)
res.setHeader('Content-Type', 'application/json')
res.setHeader('Content-Length', Buffer.byteLength(json))
res.end(method === 'HEAD' ? null : json)
}
function errorToJSON (err) {
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const { name, message, stack } = err
const json = { name, message, stack }
if (err.module) {
// rawRequest contains the filename of the module which has the error.
const { rawRequest } = err.module
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json.module = { rawRequest }
}
return json
}
function serializeError (dev, err) {
if (dev) {
return errorToJSON(err)
}
return { message: '500 - Internal Server Error.' }
}
export function serveStatic (req, res, path) {
return new Promise((resolve, reject) => {
send(req, path)
.on('directory', () => {
// We don't allow directories to be read.
const err = new Error('No directory access')
err.code = 'ENOENT'
reject(err)
})
.on('error', reject)
.pipe(res)
.on('finish', resolve)
})
}
async function ensurePage (page, { dir, hotReloader }) {
if (page === '/_error') return
await hotReloader.ensurePage(page)
}
function loadChunks ({ dev, dir, dist, availableChunks }) {
const flushedChunks = flushChunks()
const response = {
names: [],
filenames: []
}
if (dev) {
availableChunks = getAvailableChunks(dir, dist)
}
for (var chunk of flushedChunks) {
const filename = availableChunks[chunk]
if (filename) {
response.names.push(chunk)
response.filenames.push(filename)
}
}
return response
}