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hot-reloader.ts
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hot-reloader.ts
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import { getOverlayMiddleware } from 'next/dist/compiled/@next/react-dev-overlay/middleware'
import { IncomingMessage, ServerResponse } from 'http'
import { WebpackHotMiddleware } from './hot-middleware'
import { join, relative, isAbsolute } from 'path'
import { UrlObject } from 'url'
import { webpack } from 'next/dist/compiled/webpack/webpack'
import type { webpack5 } from 'next/dist/compiled/webpack/webpack'
import {
createEntrypoints,
createPagesMapping,
finalizeEntrypoint,
PagesMapping,
} from '../../build/entries'
import { watchCompilers } from '../../build/output'
import getBaseWebpackConfig from '../../build/webpack-config'
import { API_ROUTE, MIDDLEWARE_ROUTE } from '../../lib/constants'
import { recursiveDelete } from '../../lib/recursive-delete'
import { BLOCKED_PAGES } from '../../shared/lib/constants'
import { __ApiPreviewProps } from '../api-utils'
import { route } from '../router'
import { findPageFile } from '../lib/find-page-file'
import onDemandEntryHandler, {
entries,
BUILDING,
} from './on-demand-entry-handler'
import { denormalizePagePath, normalizePathSep } from '../normalize-page-path'
import getRouteFromEntrypoint from '../get-route-from-entrypoint'
import { fileExists } from '../../lib/file-exists'
import { ClientPagesLoaderOptions } from '../../build/webpack/loaders/next-client-pages-loader'
import { ssrEntries } from '../../build/webpack/plugins/middleware-plugin'
import { stringify } from 'querystring'
import {
difference,
isCustomErrorPage,
isFlightPage,
isReservedPage,
} from '../../build/utils'
import { NextConfigComplete } from '../config-shared'
import { CustomRoutes } from '../../lib/load-custom-routes'
import { DecodeError } from '../../shared/lib/utils'
import { Span, trace } from '../../trace'
import isError from '../../lib/is-error'
import ws from 'next/dist/compiled/ws'
const wsServer = new ws.Server({ noServer: true })
export async function renderScriptError(
res: ServerResponse,
error: Error,
{ verbose = true } = {}
) {
// Asks CDNs and others to not to cache the errored page
res.setHeader(
'Cache-Control',
'no-cache, no-store, max-age=0, must-revalidate'
)
if ((error as any).code === 'ENOENT') {
res.statusCode = 404
res.end('404 - Not Found')
return
}
if (verbose) {
console.error(error.stack)
}
res.statusCode = 500
res.end('500 - Internal Error')
}
function addCorsSupport(req: IncomingMessage, res: ServerResponse) {
const isApiRoute = req.url!.match(API_ROUTE)
// API routes handle their own CORS headers
if (isApiRoute) {
return { preflight: false }
}
if (!req.headers.origin) {
return { preflight: false }
}
res.setHeader('Access-Control-Allow-Origin', req.headers.origin)
res.setHeader('Access-Control-Allow-Methods', 'OPTIONS, GET')
// Based on https://github.com/primus/access-control/blob/4cf1bc0e54b086c91e6aa44fb14966fa5ef7549c/index.js#L158
if (req.headers['access-control-request-headers']) {
res.setHeader(
'Access-Control-Allow-Headers',
req.headers['access-control-request-headers'] as string
)
}
if (req.method === 'OPTIONS') {
res.writeHead(200)
res.end()
return { preflight: true }
}
return { preflight: false }
}
const matchNextPageBundleRequest = route(
'/_next/static/chunks/pages/:path*.js(\\.map|)'
)
// Recursively look up the issuer till it ends up at the root
function findEntryModule(issuer: any): any {
if (issuer.issuer) {
return findEntryModule(issuer.issuer)
}
return issuer
}
function erroredPages(compilation: webpack5.Compilation) {
const failedPages: { [page: string]: any[] } = {}
for (const error of compilation.errors) {
if (!error.module) {
continue
}
const entryModule = findEntryModule(error.module)
const { name } = entryModule
if (!name) {
continue
}
// Only pages have to be reloaded
const enhancedName = getRouteFromEntrypoint(name)
if (!enhancedName) {
continue
}
if (!failedPages[enhancedName]) {
failedPages[enhancedName] = []
}
failedPages[enhancedName].push(error)
}
return failedPages
}
export default class HotReloader {
private dir: string
private buildId: string
private middlewares: any[]
private pagesDir: string
private webpackHotMiddleware?: WebpackHotMiddleware
private config: NextConfigComplete
private webServerRuntime: boolean
private hasServerComponents: boolean
public clientStats: webpack5.Stats | null
public serverStats: webpack5.Stats | null
private clientError: Error | null = null
private serverError: Error | null = null
private serverPrevDocumentHash: string | null
private prevChunkNames?: Set<any>
private onDemandEntries?: ReturnType<typeof onDemandEntryHandler>
private previewProps: __ApiPreviewProps
private watcher: any
private rewrites: CustomRoutes['rewrites']
private fallbackWatcher: any
private hotReloaderSpan: Span
private pagesMapping: PagesMapping = {}
constructor(
dir: string,
{
config,
pagesDir,
buildId,
previewProps,
rewrites,
}: {
config: NextConfigComplete
pagesDir: string
buildId: string
previewProps: __ApiPreviewProps
rewrites: CustomRoutes['rewrites']
}
) {
this.buildId = buildId
this.dir = dir
this.middlewares = []
this.pagesDir = pagesDir
this.clientStats = null
this.serverStats = null
this.serverPrevDocumentHash = null
this.config = config
this.webServerRuntime = !!config.experimental.concurrentFeatures
this.hasServerComponents = !!(
config.experimental.concurrentFeatures &&
config.experimental.serverComponents
)
this.previewProps = previewProps
this.rewrites = rewrites
this.hotReloaderSpan = trace('hot-reloader', undefined, {
version: process.env.__NEXT_VERSION as string,
})
// Ensure the hotReloaderSpan is flushed immediately as it's the parentSpan for all processing
// of the current `next dev` invocation.
this.hotReloaderSpan.stop()
}
public async run(
req: IncomingMessage,
res: ServerResponse,
parsedUrl: UrlObject
): Promise<{ finished?: true }> {
// Usually CORS support is not needed for the hot-reloader (this is dev only feature)
// With when the app runs for multi-zones support behind a proxy,
// the current page is trying to access this URL via assetPrefix.
// That's when the CORS support is needed.
const { preflight } = addCorsSupport(req, res)
if (preflight) {
return {}
}
// When a request comes in that is a page bundle, e.g. /_next/static/<buildid>/pages/index.js
// we have to compile the page using on-demand-entries, this middleware will handle doing that
// by adding the page to on-demand-entries, waiting till it's done
// and then the bundle will be served like usual by the actual route in server/index.js
const handlePageBundleRequest = async (
pageBundleRes: ServerResponse,
parsedPageBundleUrl: UrlObject
): Promise<{ finished?: true }> => {
const { pathname } = parsedPageBundleUrl
const params: { path: string[] } | null =
matchNextPageBundleRequest(pathname)
if (!params) {
return {}
}
let decodedPagePath: string
try {
decodedPagePath = `/${params.path
.map((param) => decodeURIComponent(param))
.join('/')}`
} catch (_) {
throw new DecodeError('failed to decode param')
}
const page = denormalizePagePath(decodedPagePath)
if (page === '/_error' || BLOCKED_PAGES.indexOf(page) === -1) {
try {
await this.ensurePage(page, true)
} catch (error) {
await renderScriptError(
pageBundleRes,
isError(error) ? error : new Error(JSON.stringify(error))
)
return { finished: true }
}
const errors = await this.getCompilationErrors(page)
if (errors.length > 0) {
await renderScriptError(pageBundleRes, errors[0], { verbose: false })
return { finished: true }
}
}
return {}
}
const { finished } = await handlePageBundleRequest(res, parsedUrl)
for (const fn of this.middlewares) {
await new Promise<void>((resolve, reject) => {
fn(req, res, (err: Error) => {
if (err) return reject(err)
resolve()
})
})
}
return { finished }
}
public onHMR(req: IncomingMessage, _res: ServerResponse, head: Buffer) {
wsServer.handleUpgrade(req, req.socket, head, (client) => {
this.webpackHotMiddleware?.onHMR(client)
this.onDemandEntries?.onHMR(client)
})
}
private async clean(span: Span): Promise<void> {
return span
.traceChild('clean')
.traceAsyncFn(() =>
recursiveDelete(join(this.dir, this.config.distDir), /^cache/)
)
}
private async getWebpackConfig(span: Span) {
const webpackConfigSpan = span.traceChild('get-webpack-config')
return webpackConfigSpan.traceAsyncFn(async () => {
const pagePaths = await webpackConfigSpan
.traceChild('get-page-paths')
.traceAsyncFn(() =>
Promise.all([
findPageFile(this.pagesDir, '/_app', this.config.pageExtensions),
findPageFile(
this.pagesDir,
'/_document',
this.config.pageExtensions
),
])
)
this.pagesMapping = webpackConfigSpan
.traceChild('create-pages-mapping')
.traceFn(() =>
createPagesMapping(
pagePaths.filter((i) => i !== null) as string[],
this.config.pageExtensions,
{
isDev: true,
hasConcurrentFeatures: this.webServerRuntime,
hasServerComponents: this.hasServerComponents,
}
)
)
const entrypoints = webpackConfigSpan
.traceChild('create-entrypoints')
.traceFn(() =>
createEntrypoints(
this.pagesMapping,
'server',
this.buildId,
this.previewProps,
this.config,
[]
)
)
return webpackConfigSpan
.traceChild('generate-webpack-config')
.traceAsyncFn(() =>
Promise.all(
[
getBaseWebpackConfig(this.dir, {
dev: true,
isServer: false,
config: this.config,
buildId: this.buildId,
pagesDir: this.pagesDir,
rewrites: this.rewrites,
entrypoints: entrypoints.client,
runWebpackSpan: this.hotReloaderSpan,
}),
getBaseWebpackConfig(this.dir, {
dev: true,
isServer: true,
config: this.config,
buildId: this.buildId,
pagesDir: this.pagesDir,
rewrites: this.rewrites,
entrypoints: entrypoints.server,
runWebpackSpan: this.hotReloaderSpan,
}),
this.webServerRuntime
? getBaseWebpackConfig(this.dir, {
dev: true,
isServer: true,
webServerRuntime: true,
config: this.config,
buildId: this.buildId,
pagesDir: this.pagesDir,
rewrites: this.rewrites,
entrypoints: entrypoints.serverWeb,
runWebpackSpan: this.hotReloaderSpan,
})
: null,
].filter(Boolean) as webpack.Configuration[]
)
)
})
}
public async buildFallbackError(): Promise<void> {
if (this.fallbackWatcher) return
const fallbackConfig = await getBaseWebpackConfig(this.dir, {
runWebpackSpan: this.hotReloaderSpan,
dev: true,
isServer: false,
config: this.config,
buildId: this.buildId,
pagesDir: this.pagesDir,
rewrites: {
beforeFiles: [],
afterFiles: [],
fallback: [],
},
isDevFallback: true,
entrypoints: createEntrypoints(
{
'/_app': 'next/dist/pages/_app',
'/_error': 'next/dist/pages/_error',
},
'server',
this.buildId,
this.previewProps,
this.config,
[]
).client,
})
const fallbackCompiler = webpack(fallbackConfig)
this.fallbackWatcher = await new Promise((resolve) => {
let bootedFallbackCompiler = false
fallbackCompiler.watch(
// @ts-ignore webpack supports an array of watchOptions when using a multiCompiler
fallbackConfig.watchOptions,
// Errors are handled separately
(_err: any) => {
if (!bootedFallbackCompiler) {
bootedFallbackCompiler = true
resolve(true)
}
}
)
})
}
public async start(): Promise<void> {
const startSpan = this.hotReloaderSpan.traceChild('start')
startSpan.stop() // Stop immediately to create an artificial parent span
await this.clean(startSpan)
const configs = await this.getWebpackConfig(startSpan)
for (const config of configs) {
const defaultEntry = config.entry
config.entry = async (...args) => {
// @ts-ignore entry is always a function
const entrypoints = await defaultEntry(...args)
const isClientCompilation = config.name === 'client'
const isServerCompilation = config.name === 'server'
const isServerWebCompilation = config.name === 'server-web'
await Promise.all(
Object.keys(entries).map(async (pageKey) => {
const isClientKey = pageKey.startsWith('client')
const isServerWebKey = pageKey.startsWith('server-web')
if (isClientKey !== isClientCompilation) return
if (isServerWebKey !== isServerWebCompilation) return
const page = pageKey.slice(
isClientKey
? 'client'.length
: isServerWebKey
? 'server-web'.length
: 'server'.length
)
const isMiddleware = !!page.match(MIDDLEWARE_ROUTE)
if (isClientCompilation && page.match(API_ROUTE) && !isMiddleware) {
return
}
const isApiRoute = page.match(API_ROUTE)
if (!isClientCompilation && isMiddleware) {
return
}
const { bundlePath, absolutePagePath, dispose } = entries[pageKey]
const pageExists = !dispose && (await fileExists(absolutePagePath))
if (!pageExists) {
// page was removed or disposed
delete entries[pageKey]
return
}
const isCustomError = isCustomErrorPage(page)
const isReserved = isReservedPage(page)
const isServerComponent =
this.hasServerComponents &&
isFlightPage(this.config, absolutePagePath)
if (
isServerCompilation &&
this.webServerRuntime &&
!isApiRoute &&
!isCustomError
) {
return
}
entries[pageKey].status = BUILDING
const pageLoaderOpts: ClientPagesLoaderOptions = {
page,
absolutePagePath,
}
if (isClientCompilation && isMiddleware) {
entrypoints[bundlePath] = finalizeEntrypoint({
name: bundlePath,
value: `next-middleware-loader?${stringify(pageLoaderOpts)}!`,
isServer: false,
isMiddleware: true,
})
} else if (isClientCompilation) {
entrypoints[bundlePath] = finalizeEntrypoint({
name: bundlePath,
value: `next-client-pages-loader?${stringify(pageLoaderOpts)}!`,
isServer: false,
})
if (isServerComponent) {
ssrEntries.set(bundlePath, { requireFlightManifest: true })
} else if (
this.webServerRuntime &&
!isReserved &&
!isCustomError
) {
ssrEntries.set(bundlePath, { requireFlightManifest: false })
}
} else if (isServerWebCompilation) {
if (!isReserved) {
entrypoints[bundlePath] = finalizeEntrypoint({
name: '[name].js',
value: `next-middleware-ssr-loader?${stringify({
page,
absoluteAppPath: this.pagesMapping['/_app'],
absoluteDocumentPath: this.pagesMapping['/_document'],
absoluteErrorPath: this.pagesMapping['/_error'],
absolute404Path: this.pagesMapping['/404'] || '',
absolutePagePath,
isServerComponent,
buildId: this.buildId,
basePath: this.config.basePath,
assetPrefix: this.config.assetPrefix,
generateEtags: this.config.generateEtags,
poweredByHeader: this.config.poweredByHeader,
canonicalBase: this.config.amp.canonicalBase,
i18n: this.config.i18n,
previewProps: this.previewProps,
} as any)}!`,
isServer: false,
isServerWeb: true,
})
}
} else {
let request = relative(config.context!, absolutePagePath)
if (!isAbsolute(request) && !request.startsWith('../')) {
request = `./${request}`
}
entrypoints[bundlePath] = finalizeEntrypoint({
name: bundlePath,
value: request,
isServer: true,
})
}
})
)
return entrypoints
}
}
// Enable building of client compilation before server compilation in development
// @ts-ignore webpack 5
configs.parallelism = 1
const multiCompiler = webpack(configs) as unknown as webpack5.MultiCompiler
watchCompilers(
multiCompiler.compilers[0],
multiCompiler.compilers[1],
multiCompiler.compilers[2] || null
)
// Watch for changes to client/server page files so we can tell when just
// the server file changes and trigger a reload for GS(S)P pages
const changedClientPages = new Set<string>()
const changedServerPages = new Set<string>()
const prevClientPageHashes = new Map<string, string>()
const prevServerPageHashes = new Map<string, string>()
const trackPageChanges =
(pageHashMap: Map<string, string>, changedItems: Set<string>) =>
(stats: webpack5.Compilation) => {
stats.entrypoints.forEach((entry, key) => {
if (key.startsWith('pages/')) {
// TODO this doesn't handle on demand loaded chunks
entry.chunks.forEach((chunk: any) => {
if (chunk.id === key) {
const prevHash = pageHashMap.get(key)
if (prevHash && prevHash !== chunk.hash) {
changedItems.add(key)
}
pageHashMap.set(key, chunk.hash)
}
})
}
})
}
multiCompiler.compilers[0].hooks.emit.tap(
'NextjsHotReloaderForClient',
trackPageChanges(prevClientPageHashes, changedClientPages)
)
multiCompiler.compilers[1].hooks.emit.tap(
'NextjsHotReloaderForServer',
trackPageChanges(prevServerPageHashes, changedServerPages)
)
// This plugin watches for changes to _document.js and notifies the client side that it should reload the page
multiCompiler.compilers[1].hooks.failed.tap(
'NextjsHotReloaderForServer',
(err: Error) => {
this.serverError = err
this.serverStats = null
}
)
multiCompiler.compilers[1].hooks.done.tap(
'NextjsHotReloaderForServer',
(stats) => {
this.serverError = null
this.serverStats = stats
const { compilation } = stats
// We only watch `_document` for changes on the server compilation
// the rest of the files will be triggered by the client compilation
const documentChunk = compilation.namedChunks.get('pages/_document')
// If the document chunk can't be found we do nothing
if (!documentChunk) {
console.warn('_document.js chunk not found')
return
}
// Initial value
if (this.serverPrevDocumentHash === null) {
this.serverPrevDocumentHash = documentChunk.hash || null
return
}
// If _document.js didn't change we don't trigger a reload
if (documentChunk.hash === this.serverPrevDocumentHash) {
return
}
// Notify reload to reload the page, as _document.js was changed (different hash)
this.send('reloadPage')
this.serverPrevDocumentHash = documentChunk.hash || null
}
)
multiCompiler.hooks.done.tap('NextjsHotReloaderForServer', () => {
const serverOnlyChanges = difference<string>(
changedServerPages,
changedClientPages
)
const middlewareChanges = Array.from(changedClientPages).filter((name) =>
name.match(MIDDLEWARE_ROUTE)
)
changedClientPages.clear()
changedServerPages.clear()
if (middlewareChanges.length > 0) {
this.send({
event: 'middlewareChanges',
})
}
if (serverOnlyChanges.length > 0) {
this.send({
event: 'serverOnlyChanges',
pages: serverOnlyChanges.map((pg) =>
denormalizePagePath(pg.substr('pages'.length))
),
})
}
})
multiCompiler.compilers[0].hooks.failed.tap(
'NextjsHotReloaderForClient',
(err: Error) => {
this.clientError = err
this.clientStats = null
}
)
multiCompiler.compilers[0].hooks.done.tap(
'NextjsHotReloaderForClient',
(stats) => {
this.clientError = null
this.clientStats = stats
const { compilation } = stats
const chunkNames = new Set(
[...compilation.namedChunks.keys()].filter(
(name) => !!getRouteFromEntrypoint(name)
)
)
if (this.prevChunkNames) {
// detect chunks which have to be replaced with a new template
// e.g, pages/index.js <-> pages/_error.js
const addedPages = diff(chunkNames, this.prevChunkNames!)
const removedPages = diff(this.prevChunkNames!, chunkNames)
if (addedPages.size > 0) {
for (const addedPage of addedPages) {
const page = getRouteFromEntrypoint(addedPage)
this.send('addedPage', page)
}
}
if (removedPages.size > 0) {
for (const removedPage of removedPages) {
const page = getRouteFromEntrypoint(removedPage)
this.send('removedPage', page)
}
}
}
this.prevChunkNames = chunkNames
}
)
this.webpackHotMiddleware = new WebpackHotMiddleware(
multiCompiler.compilers
)
let booted = false
this.watcher = await new Promise((resolve) => {
const watcher = multiCompiler.watch(
// @ts-ignore webpack supports an array of watchOptions when using a multiCompiler
configs.map((config) => config.watchOptions!),
// Errors are handled separately
(_err: any) => {
if (!booted) {
booted = true
resolve(watcher)
}
}
)
})
this.onDemandEntries = onDemandEntryHandler(this.watcher, multiCompiler, {
pagesDir: this.pagesDir,
nextConfig: this.config,
...(this.config.onDemandEntries as {
maxInactiveAge: number
pagesBufferLength: number
}),
})
this.middlewares = [
getOverlayMiddleware({
rootDirectory: this.dir,
stats: () => this.clientStats,
serverStats: () => this.serverStats,
}),
]
}
public async stop(): Promise<void> {
await new Promise((resolve, reject) => {
this.watcher.close((err: any) => (err ? reject(err) : resolve(true)))
})
if (this.fallbackWatcher) {
await new Promise((resolve, reject) => {
this.fallbackWatcher.close((err: any) =>
err ? reject(err) : resolve(true)
)
})
}
}
public async getCompilationErrors(page: string) {
const normalizedPage = normalizePathSep(page)
if (this.clientError || this.serverError) {
return [this.clientError || this.serverError]
} else if (this.clientStats?.hasErrors()) {
const { compilation } = this.clientStats
const failedPages = erroredPages(compilation)
// If there is an error related to the requesting page we display it instead of the first error
if (
failedPages[normalizedPage] &&
failedPages[normalizedPage].length > 0
) {
return failedPages[normalizedPage]
}
// If none were found we still have to show the other errors
return this.clientStats.compilation.errors
} else if (this.serverStats?.hasErrors()) {
const { compilation } = this.serverStats
const failedPages = erroredPages(compilation)
// If there is an error related to the requesting page we display it instead of the first error
if (
failedPages[normalizedPage] &&
failedPages[normalizedPage].length > 0
) {
return failedPages[normalizedPage]
}
// If none were found we still have to show the other errors
return this.serverStats.compilation.errors
}
return []
}
public send(action?: string | any, ...args: any[]): void {
this.webpackHotMiddleware!.publish(
action && typeof action === 'object' ? action : { action, data: args }
)
}
public async ensurePage(page: string, clientOnly: boolean = false) {
// Make sure we don't re-build or dispose prebuilt pages
if (page !== '/_error' && BLOCKED_PAGES.indexOf(page) !== -1) {
return
}
const error = clientOnly
? this.clientError
: this.serverError || this.clientError
if (error) {
return Promise.reject(error)
}
return this.onDemandEntries?.ensurePage(page, clientOnly) as any
}
}
function diff(a: Set<any>, b: Set<any>) {
return new Set([...a].filter((v) => !b.has(v)))
}