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next.js/server/index.js

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import { resolve, join } from 'path'
import { parse } from 'url'
import http from 'http'
import {
renderToHTML,
renderErrorToHTML,
renderJSON,
renderErrorJSON,
sendHTML,
serveStatic,
serveStaticWithGzip
} from './render'
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import Router from './router'
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import HotReloader from './hot-reloader'
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import { resolveFromList } from './resolve'
import getConfig from './config'
// We need to go up one more level since we are in the `dist` directory
import pkg from '../../package'
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export default class Server {
constructor ({ dir = '.', dev = false, staticMarkup = false, quiet = false } = {}) {
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this.dir = resolve(dir)
this.dev = dev
this.quiet = quiet
this.renderOpts = { dir: this.dir, dev, staticMarkup }
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this.router = new Router()
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this.hotReloader = dev ? new HotReloader(this.dir, { quiet }) : null
this.http = null
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this.config = getConfig(this.dir)
this.defineRoutes()
}
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getRequestHandler () {
return (req, res) => {
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this.run(req, res)
.catch((err) => {
if (!this.quiet) console.error(err)
res.statusCode = 500
res.end('error')
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})
}
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}
async prepare () {
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if (this.hotReloader) {
await this.hotReloader.start()
}
}
async close () {
if (this.hotReloader) {
await this.hotReloader.stop()
}
}
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defineRoutes () {
this.router.get('/_next-prefetcher.js', async (req, res, params) => {
const p = join(__dirname, '../client/next-prefetcher-bundle.js')
await serveStatic(req, res, p)
})
this.router.get('/_next/main.js', async (req, res, params) => {
const p = join(this.dir, '.next/main.js')
await serveStaticWithGzip(req, res, p)
})
this.router.get('/_next/commons.js', async (req, res, params) => {
const p = join(this.dir, '.next/commons.js')
await serveStaticWithGzip(req, res, p)
})
this.router.get('/_next/pages/:path*', async (req, res, params) => {
const paths = params.path || ['index']
const pathname = `/${paths.join('/')}`
await this.renderJSON(req, res, pathname)
})
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this.router.get('/_next/:path+', async (req, res, params) => {
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const p = join(__dirname, '..', 'client', ...(params.path || []))
await serveStatic(req, res, p)
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})
this.router.get('/static/:path+', async (req, res, params) => {
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const p = join(this.dir, 'static', ...(params.path || []))
await serveStatic(req, res, p)
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})
this.router.get('/:path*', async (req, res) => {
const { pathname, query } = parse(req.url, true)
await this.render(req, res, pathname, query)
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})
}
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async start (port) {
await this.prepare()
this.http = http.createServer(this.getRequestHandler())
await new Promise((resolve, reject) => {
this.http.listen(port, (err) => {
if (err) return reject(err)
resolve()
})
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})
}
async run (req, res) {
if (this.hotReloader) {
await this.hotReloader.run(req, res)
}
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const fn = this.router.match(req, res)
if (fn) {
await fn()
} else {
await this.render404(req, res)
}
}
async render (req, res, pathname, query) {
if (this.config.poweredByHeader) {
res.setHeader('X-Powered-By', `Next.js ${pkg.version}`)
}
const html = await this.renderToHTML(req, res, pathname, query)
sendHTML(res, html)
}
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async renderToHTML (req, res, pathname, query) {
if (this.dev) {
const compilationErr = this.getCompilationError(pathname)
if (compilationErr) {
res.statusCode = 500
return this.renderErrorToHTML(compilationErr, req, res, pathname, query)
}
}
try {
return await renderToHTML(req, res, pathname, query, this.renderOpts)
} catch (err) {
if (err.code === 'ENOENT') {
res.statusCode = 404
return this.renderErrorToHTML(null, req, res, pathname, query)
} else {
if (!this.quiet) console.error(err)
res.statusCode = 500
return this.renderErrorToHTML(err, req, res, pathname, query)
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}
}
}
async renderError (err, req, res, pathname, query) {
const html = await this.renderErrorToHTML(err, req, res, pathname, query)
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sendHTML(res, html)
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}
async renderErrorToHTML (err, req, res, pathname, query) {
if (this.dev) {
const compilationErr = this.getCompilationError('/_error')
if (compilationErr) {
res.statusCode = 500
return renderErrorToHTML(compilationErr, req, res, pathname, query, this.renderOpts)
}
}
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try {
return await renderErrorToHTML(err, req, res, pathname, query, this.renderOpts)
} catch (err2) {
if (this.dev) {
if (!this.quiet) console.error(err2)
res.statusCode = 500
return renderErrorToHTML(err2, req, res, pathname, query, this.renderOpts)
} else {
throw err2
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}
}
}
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async render404 (req, res) {
const { pathname, query } = parse(req.url, true)
res.statusCode = 404
this.renderErrorToHTML(null, req, res, pathname, query)
}
async renderJSON (req, res, page) {
if (this.dev) {
const compilationErr = this.getCompilationError(page)
if (compilationErr) {
return this.renderErrorJSON(compilationErr, req, res)
}
}
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try {
await renderJSON(req, res, page, this.renderOpts)
} catch (err) {
if (err.code === 'ENOENT') {
res.statusCode = 404
return this.renderErrorJSON(null, req, res)
} else {
if (!this.quiet) console.error(err)
res.statusCode = 500
return this.renderErrorJSON(err, req, res)
}
}
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}
async renderErrorJSON (err, req, res) {
if (this.dev) {
const compilationErr = this.getCompilationError('/_error')
if (compilationErr) {
res.statusCode = 500
return renderErrorJSON(compilationErr, req, res, this.renderOpts)
}
}
return renderErrorJSON(err, req, res, this.renderOpts)
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}
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getCompilationError (page) {
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if (!this.hotReloader) return
const errors = this.hotReloader.getCompilationErrors()
if (!errors.size) return
const id = join(this.dir, '.next', 'bundles', 'pages', page)
const p = resolveFromList(id, errors.keys())
if (p) return errors.get(p)[0]
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}
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}