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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'
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import requireModule from './require'
import getConfig from './config'
import resolvePath from './resolve'
import readPage from './read-page'
import { Router } from '../lib/router'
import { loadGetInitialProps } from '../lib/utils'
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import Head, { defaultHead } from '../lib/head'
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import App from '../lib/app'
import ErrorDebug from '../lib/error-debug'
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export async function render (req, res, pathname, query, opts) {
const html = await renderToHTML(req, res, pathname, opts)
sendHTML(res, html, req.method)
}
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, req.method)
}
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,
buildStats,
hotReloader,
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dir = process.cwd(),
dev = false,
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staticMarkup = false
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} = {}) {
page = page || pathname
await ensurePage(page, { dir, hotReloader })
const dist = getConfig(dir).distDir
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let [Component, Document] = await Promise.all([
requireModule(join(dir, dist, 'dist', 'pages', page)),
requireModule(join(dir, dist, 'dist', 'pages', '_document'))
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])
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([
loadGetInitialProps(Component, ctx),
readPage(join(dir, dist, 'bundles', 'pages', page)),
readPage(join(dir, dist, 'bundles', 'pages', '_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
let errorHtml = ''
try {
html = render(app)
} finally {
head = Head.rewind() || defaultHead()
}
if (err && dev) {
errorHtml = render(createElement(ErrorDebug, { error: err }))
}
return { html, head, errorHtml }
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}
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const docProps = await loadGetInitialProps(Document, { ...ctx, renderPage })
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if (res.finished) return
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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,
buildId,
buildStats,
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(), hotReloader } = {}) {
const dist = getConfig(dir).distDir
await ensurePage(page, { dir, hotReloader })
const pagePath = await resolvePath(join(dir, dist, 'bundles', 'pages', page))
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return serveStatic(req, res, pagePath)
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}
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export async function renderErrorJSON (err, req, res, { dir = process.cwd(), dev = false } = {}) {
const dist = getConfig(dir).distDir
const component = await readPage(join(dir, dist, 'bundles', 'pages', '_error'))
sendJSON(res, {
component,
err: err && dev ? errorToJSON(err) : null
}, req.method)
}
export function sendHTML (res, html, method) {
if (res.finished) return
res.setHeader('Content-Type', 'text/html')
res.setHeader('Content-Length', Buffer.byteLength(html))
res.end(method === 'HEAD' ? null : html)
}
export function sendJSON (res, obj, method) {
if (res.finished) 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
}
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 (!hotReloader) return
if (page === '_error' || page === '_document') return
await hotReloader.ensurePage(page)
}