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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 fs from 'mz/fs'
import send from 'send'
import accepts from 'accepts'
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import requireModule from './require'
import readPage from './read-page'
import { Router } from '../lib/router'
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import Head, { defaultHead } from '../lib/head'
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import App from '../lib/app'
export async function render (req, res, pathname, query, opts) {
const html = await renderToHTML(req, res, pathname, opts)
sendHTML(res, html)
}
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(res, html)
}
export function renderErrorToHTML (err, req, res, pathname, query, opts = {}) {
const page = err && opts.dev ? '/_error-debug' : '/_error'
return doRender(req, res, pathname, query, { ...opts, err, page })
}
async function doRender (req, res, pathname, query, {
err,
page,
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dir = process.cwd(),
dev = false,
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staticMarkup = false
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} = {}) {
page = page || pathname
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let [Component, Document] = await Promise.all([
requireModule(join(dir, '.next', 'dist', 'pages', page)),
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requireModule(join(dir, '.next', 'dist', 'pages', '_document'))
])
Component = Component.default || Component
Document = Document.default || Document
const ctx = { err, req, res, pathname, query }
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const [
props,
component,
errorComponent
] = await Promise.all([
Component.getInitialProps ? Component.getInitialProps(ctx) : {},
readPage(join(dir, '.next', 'bundles', 'pages', page)),
readPage(join(dir, '.next', 'bundles', 'pages', dev ? '_error-debug' : '_error'))
])
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// the response might be finshed on the getinitialprops call
if (res.finished) return
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const renderPage = () => {
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const app = createElement(App, {
Component,
props,
router: new Router(pathname, query)
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})
const render = staticMarkup ? renderToStaticMarkup : renderToString
let html
let head
try {
html = render(app)
} finally {
head = Head.rewind() || defaultHead()
}
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return { html, head }
}
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const docProps = await Document.getInitialProps({ ...ctx, renderPage })
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const doc = createElement(Document, {
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__NEXT_DATA__: {
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component,
errorComponent,
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props,
pathname,
query,
err: (err && dev) ? errorToJSON(err) : null
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},
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dev,
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staticMarkup,
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...docProps
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})
return '<!DOCTYPE html>' + renderToStaticMarkup(doc)
}
export async function renderJSON (req, res, page, { dir = process.cwd() } = {}) {
const pagePath = join(dir, '.next', 'bundles', 'pages', `${page}.json`)
return serveStaticWithGzip(req, res, pagePath)
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}
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export async function renderErrorJSON (err, req, res, { dir = process.cwd(), dev = false } = {}) {
const page = err && dev ? '/_error-debug' : '/_error'
const component = await readPage(join(dir, '.next', 'bundles', 'pages', page))
sendJSON(res, {
component,
err: err && dev ? errorToJSON(err) : null
})
}
export function sendHTML (res, html) {
if (res.finished) return
res.setHeader('Content-Type', 'text/html')
res.setHeader('Content-Length', Buffer.byteLength(html))
res.end(html)
}
export function sendJSON (res, obj) {
if (res.finished) return
const json = JSON.stringify(obj)
res.setHeader('Content-Type', 'application/json')
res.setHeader('Content-Length', Buffer.byteLength(json))
res.end(json)
}
function errorToJSON (err) {
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const { name, message, stack } = err
const json = { name, message, stack }
if (name === 'ModuleBuildError') {
// webpack compilation error
const { module: { rawRequest } } = err
json.module = { rawRequest }
}
return json
}
export async function serveStaticWithGzip (req, res, path) {
const encoding = accepts(req).encodings(['gzip'])
if (encoding !== 'gzip') {
return serveStatic(req, res, path)
}
try {
const gzipPath = `${path}.gz`
// fs.access before a file read is not recommeded due to race conditions.
// But in this case, this is totally fine because we know
// it's impossible to have a race condition like that.
// (Since we gzip AOT when called `next build`)
await fs.access(gzipPath, fs.constants.R_OK)
res.setHeader('Content-Encoding', 'gzip')
return serveStatic(req, res, gzipPath)
} catch (ex) {
if (ex.code === 'ENOENT') {
return serveStatic(req, res, path)
}
throw ex
}
}
export function serveStatic (req, res, path) {
return new Promise((resolve, reject) => {
send(req, path)
.on('error', (err) => {
if (err.code === 'ENOENT') {
res.statusCode = 404
res.end('Not Found')
resolve()
} else {
reject(err)
}
})
.pipe(res)
.on('finish', resolve)
})
}