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next.js/server/render.js
2017-02-08 05:43:25 +05:30

196 lines
5.3 KiB
JavaScript

import { join } from 'path'
import { createElement } from 'react'
import { renderToString, renderToStaticMarkup } from 'react-dom/server'
import send from 'send'
import fs from 'mz/fs'
import accepts from 'accepts'
import mime from 'mime-types'
import requireModule from './require'
import resolvePath from './resolve'
import readPage from './read-page'
import { Router } from '../lib/router'
import { loadGetInitialProps } from '../lib/utils'
import Head, { defaultHead } from '../lib/head'
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, 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,
dir = process.cwd(),
dev = false,
staticMarkup = false
} = {}) {
page = page || pathname
let [Component, Document] = await Promise.all([
requireModule(join(dir, '.next', 'dist', 'pages', page)),
requireModule(join(dir, '.next', 'dist', 'pages', '_document'))
])
Component = Component.default || Component
Document = Document.default || Document
const ctx = { err, req, res, pathname, query }
const [
props,
component,
errorComponent
] = await Promise.all([
loadGetInitialProps(Component, ctx),
readPage(join(dir, '.next', 'bundles', 'pages', page)),
readPage(join(dir, '.next', 'bundles', 'pages', '_error'))
])
// the response might be finshed on the getinitialprops call
if (res.finished) return
const renderPage = () => {
const app = createElement(App, {
Component,
props,
err,
router: new Router(pathname, query)
})
const render = staticMarkup ? renderToStaticMarkup : renderToString
let html
let head
try {
html = render(app)
} finally {
head = Head.rewind() || defaultHead()
}
return { html, head }
}
const docProps = await loadGetInitialProps(Document, { ...ctx, renderPage })
if (res.finished) return
const doc = createElement(Document, {
__NEXT_DATA__: {
component,
errorComponent,
props,
pathname,
query,
buildId,
err: (err && dev) ? errorToJSON(err) : null
},
dev,
staticMarkup,
...docProps
})
return '<!DOCTYPE html>' + renderToStaticMarkup(doc)
}
export async function renderJSON (req, res, page, { dir = process.cwd() } = {}) {
const pagePath = await resolvePath(join(dir, '.next', 'bundles', 'pages', page))
return serveStaticWithGzip(req, res, pagePath)
}
export async function renderErrorJSON (err, req, res, { dir = process.cwd(), dev = false } = {}) {
const component = await readPage(join(dir, '.next', '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) {
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)
}
const gzipPath = `${path}.gz`
try {
// We need to check the existance of the gzipPath.
// Getting `ENOENT` error from the `serveStatic` is inconsistent and
// didn't work on all the cases.
//
// And this won't give us a race condition because we know that
// we don't add gzipped files at runtime.
await fs.stat(gzipPath)
} catch (ex) {
// Handles the error thrown by fs.stat
if (ex.code === 'ENOENT') {
// Seems like there's no gzipped file. Let's serve the uncompressed file.
return serveStatic(req, res, path)
}
throw ex
}
const contentType = mime.lookup(path) || 'application/octet-stream'
res.setHeader('Content-Type', contentType)
res.setHeader('Content-Encoding', 'gzip')
return serveStatic(req, res, gzipPath)
}
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)
})
}