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next.js/packages/next/server/next-dev-server.js

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import Server from 'next-server/dist/server/next-server'
import { join } from 'path'
import HotReloader from './hot-reloader'
2018-10-01 22:55:31 +00:00
import {route} from 'next-server/dist/server/router'
import {PHASE_DEVELOPMENT_SERVER} from 'next-server/constants'
export default class DevServer extends Server {
constructor (options) {
super(options)
this.hotReloader = new HotReloader(this.dir, { config: this.nextConfig, buildId: this.buildId })
this.renderOpts.dev = true
}
currentPhase () {
return PHASE_DEVELOPMENT_SERVER
}
readBuildId () {
return 'development'
}
async addExportPathMapRoutes () {
// Makes `next export` exportPathMap work in development mode.
// So that the user doesn't have to define a custom server reading the exportPathMap
if (this.nextConfig.exportPathMap) {
console.log('Defining routes from exportPathMap')
const exportPathMap = await this.nextConfig.exportPathMap({}, {dev: true, dir: this.dir, outDir: null, distDir: this.distDir, buildId: this.buildId}) // In development we can't give a default path mapping
for (const path in exportPathMap) {
const {page, query = {}} = exportPathMap[path]
// We use unshift so that we're sure the routes is defined before Next's default routes
this.router.add({
match: route(path),
fn: async (req, res, params, parsedUrl) => {
const { query: urlQuery } = parsedUrl
Object.keys(urlQuery)
.filter(key => query[key] === undefined)
.forEach(key => console.warn(`Url defines a query parameter '${key}' that is missing in exportPathMap`))
const mergedQuery = {...urlQuery, ...query}
await this.render(req, res, page, mergedQuery, parsedUrl)
}
})
}
}
}
async prepare () {
await super.prepare()
await this.addExportPathMapRoutes()
await this.hotReloader.start()
}
async close () {
await this.hotReloader.stop()
}
async run (req, res, parsedUrl) {
const {finished} = await this.hotReloader.run(req, res, parsedUrl)
if (finished) {
return
}
return super.run(req, res, parsedUrl)
}
generateRoutes () {
const routes = super.generateRoutes()
// In development we expose all compiled files for react-error-overlay's line show feature
// We use unshift so that we're sure the routes is defined before Next's default routes
routes.unshift({
match: route('/_next/development/:path*'),
fn: async (req, res, params) => {
const p = join(this.distDir, ...(params.path || []))
await this.serveStatic(req, res, p)
}
})
return routes
}
async renderToHTML (req, res, pathname, query) {
const compilationErr = await this.getCompilationError(pathname)
if (compilationErr) {
res.statusCode = 500
return this.renderErrorToHTML(compilationErr, req, res, pathname, query)
}
// In dev mode we use on demand entries to compile the page before rendering
try {
await this.hotReloader.ensurePage(pathname)
} catch (err) {
if (err.code === 'ENOENT') {
res.statusCode = 404
return this.renderErrorToHTML(null, req, res, pathname, query)
}
if (!this.quiet) console.error(err)
}
return super.renderToHTML(req, res, pathname, query)
}
async renderErrorToHTML (err, req, res, pathname, query) {
const compilationErr = await this.getCompilationError(pathname)
if (compilationErr) {
res.statusCode = 500
return super.renderErrorToHTML(compilationErr, req, res, pathname, query)
}
try {
const out = await super.renderErrorToHTML(err, req, res, pathname, query)
return out
} catch (err2) {
if (!this.quiet) console.error(err2)
res.statusCode = 500
return super.renderErrorToHTML(err2, req, res, pathname, query)
}
}
sendHTML (req, res, html) {
// In dev, we should not cache pages for any reason.
res.setHeader('Cache-Control', 'no-store, must-revalidate')
return super.sendHTML(req, res, html)
}
setImmutableAssetCacheControl (res) {
res.setHeader('Cache-Control', 'no-store, must-revalidate')
}
async getCompilationError (page) {
const errors = await this.hotReloader.getCompilationErrors(page)
if (errors.length === 0) return
// Return the very first error we found.
return errors[0]
}
}