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{ EventEmitter } from 'events'\nimport { IncomingMessage, ServerResponse } from 'http'\nimport { join, posix } from 'path'\nimport { parse } from 'url'\nimport { webpack, isWebpack5 } from 'next/dist/compiled/webpack/webpack'\nimport * as Log from '../build/output/log'\nimport {\n normalizePagePath,\n normalizePathSep,\n} from '../next-server/server/normalize-page-path'\nimport { pageNotFoundError } from '../next-server/server/require'\nimport { findPageFile } from './lib/find-page-file'\nimport getRouteFromEntrypoint from '../next-server/server/get-route-from-entrypoint'\n\nexport const ADDED = Symbol('added')\nexport const BUILDING = Symbol('building')\nexport const BUILT = Symbol('built')\n\nexport let entries: {\n [page: string]: {\n serverBundlePath: string\n clientBundlePath: string\n absolutePagePath: string\n status?: typeof ADDED | typeof BUILDING | typeof BUILT\n lastActiveTime?: number\n }\n} = {}\n\nexport default function onDemandEntryHandler(\n watcher: any,\n multiCompiler: webpack.MultiCompiler,\n {\n pagesDir,\n pageExtensions,\n maxInactiveAge,\n pagesBufferLength,\n }: {\n pagesDir: string\n pageExtensions: string[]\n maxInactiveAge: number\n pagesBufferLength: number\n }\n) {\n const { compilers } = multiCompiler\n const invalidator = new Invalidator(watcher, multiCompiler)\n\n let lastAccessPages = ['']\n let doneCallbacks: EventEmitter | null = new EventEmitter()\n\n for (const compiler of compilers) {\n compiler.hooks.make.tap(\n 'NextJsOnDemandEntries',\n (_compilation: webpack.compilation.Compilation) => {\n invalidator.startBuilding()\n }\n )\n }\n\n function getPagePathsFromEntrypoints(entrypoints: any): string[] {\n const pagePaths = []\n for (const entrypoint of entrypoints.values()) {\n const page = getRouteFromEntrypoint(entrypoint.name)\n if (page) {\n pagePaths.push(page)\n }\n }\n\n return pagePaths\n }\n\n multiCompiler.hooks.done.tap('NextJsOnDemandEntries', (multiStats) => {\n const [clientStats, serverStats] = multiStats.stats\n const pagePaths = new Set([\n ...getPagePathsFromEntrypoints(clientStats.compilation.entrypoints),\n ...getPagePathsFromEntrypoints(serverStats.compilation.entrypoints),\n ])\n\n for (const page of pagePaths) {\n const entry = entries[page]\n if (!entry) {\n continue\n }\n\n if (entry.status !== BUILDING) {\n continue\n }\n\n entry.status = BUILT\n entry.lastActiveTime = Date.now()\n doneCallbacks!.emit(page)\n }\n\n invalidator.doneBuilding()\n })\n\n const disposeHandler = setInterval(function () {\n disposeInactiveEntries(watcher, lastAccessPages, maxInactiveAge)\n }, 5000)\n\n disposeHandler.unref()\n\n function handlePing(pg: string) {\n const page = normalizePathSep(pg)\n const entryInfo = entries[page]\n let toSend\n\n // If there's no entry, it may have been invalidated and needs to be re-built.\n if (!entryInfo) {\n // if (page !== lastEntry) client pings, but there's no entry for page\n return { invalid: true }\n }\n\n // 404 is an on demand entry but when a new page is added we have to refresh the page\n if (page === '/_error') {\n toSend = { invalid: true }\n } else {\n toSend = { success: true }\n }\n\n // We don't need to maintain active state of anything other than BUILT entries\n if (entryInfo.status !== BUILT) return\n\n // If there's an entryInfo\n if (!lastAccessPages.includes(page)) {\n lastAccessPages.unshift(page)\n\n // Maintain the buffer max length\n if (lastAccessPages.length > pagesBufferLength) {\n lastAccessPages.pop()\n }\n }\n entryInfo.lastActiveTime = Date.now()\n return toSend\n }\n\n return {\n async ensurePage(page: string) {\n let normalizedPagePath: string\n try {\n normalizedPagePath = normalizePagePath(page)\n } catch (err) {\n console.error(err)\n throw pageNotFoundError(page)\n }\n\n let pagePath = await findPageFile(\n pagesDir,\n normalizedPagePath,\n pageExtensions\n )\n\n // Default the /_error route to the Next.js provided default page\n if (page === '/_error' && pagePath === null) {\n pagePath = 'next/dist/pages/_error'\n }\n\n if (pagePath === null) {\n throw pageNotFoundError(normalizedPagePath)\n }\n\n let pageUrl = pagePath.replace(/\\\\/g, '/')\n\n pageUrl = `${pageUrl[0] !== '/' ? '/' : ''}${pageUrl\n .replace(new RegExp(`\\\\.+(?:${pageExtensions.join('|')})$`), '')\n .replace(/\\/index$/, '')}`\n\n pageUrl = pageUrl === '' ? '/' : pageUrl\n\n const bundleFile = normalizePagePath(pageUrl)\n const serverBundlePath = posix.join('pages', bundleFile)\n const clientBundlePath = posix.join('pages', bundleFile)\n const absolutePagePath = pagePath.startsWith('next/dist/pages')\n ? require.resolve(pagePath)\n : join(pagesDir, pagePath)\n\n page = posix.normalize(pageUrl)\n\n return new Promise<void>((resolve, reject) => {\n // Makes sure the page that is being kept in on-demand-entries matches the webpack output\n const normalizedPage = normalizePathSep(page)\n const entryInfo = entries[normalizedPage]\n\n if (entryInfo) {\n if (entryInfo.status === BUILT) {\n resolve()\n return\n }\n\n if (entryInfo.status === BUILDING) {\n doneCallbacks!.once(normalizedPage, handleCallback)\n return\n }\n }\n\n Log.event(`build page: ${normalizedPage}`)\n\n entries[normalizedPage] = {\n serverBundlePath,\n clientBundlePath,\n absolutePagePath,\n status: ADDED,\n }\n doneCallbacks!.once(normalizedPage, handleCallback)\n\n invalidator.invalidate()\n\n function handleCallback(err: Error) {\n if (err) return reject(err)\n resolve()\n }\n })\n },\n\n middleware(req: IncomingMessage, res: ServerResponse, next: Function) {\n if (!req.url?.startsWith('/_next/webpack-hmr')) return next()\n\n const { query } = parse(req.url!, true)\n const page = query.page\n if (!page) return next()\n\n const runPing = () => {\n const data = handlePing(query.page as string)\n if (!data) return\n res.write('data: ' + JSON.stringify(data) + '\\n\\n')\n }\n const pingInterval = setInterval(() => runPing(), 5000)\n\n req.on('close', () => {\n clearInterval(pingInterval)\n })\n next()\n },\n }\n}\n\nfunction disposeInactiveEntries(\n watcher: any,\n lastAccessPages: any,\n maxInactiveAge: number\n) {\n const disposingPages: any = []\n\n Object.keys(entries).forEach((page) => {\n const { lastActiveTime, status } = entries[page]\n\n // This means this entry is currently building or just added\n // We don't need to dispose those entries.\n if (status !== BUILT) return\n\n // We should not build the last accessed page even we didn't get any pings\n // Sometimes, it's possible our XHR ping to wait before completing other requests.\n // In that case, we should not dispose the current viewing page\n if (lastAccessPages.includes(page)) return\n\n if (lastActiveTime && Date.now() - lastActiveTime > maxInactiveAge) {\n disposingPages.push(page)\n }\n })\n\n if (disposingPages.length > 0) {\n disposingPages.forEach((page: any) => {\n delete entries[page]\n })\n // disposing inactive page(s)\n watcher.invalidate()\n }\n}\n\n// Make sure only one invalidation happens at a time\n// Otherwise, webpack hash gets changed and it'll force the client to reload.\nclass Invalidator {\n private multiCompiler: webpack.MultiCompiler\n private watcher: any\n private building: boolean\n private rebuildAgain: boolean\n\n constructor(watcher: any, multiCompiler: webpack.MultiCompiler) {\n this.multiCompiler = multiCompiler\n this.watcher = watcher\n // contains an array of types of compilers currently building\n this.building = false\n this.rebuildAgain = false\n }\n\n invalidate() {\n // If there's a current build is processing, we won't abort it by invalidating.\n // (If aborted, it'll cause a client side hard reload)\n // But let it to invalidate just after the completion.\n // So, it can re-build the queued pages at once.\n if (this.building) {\n this.rebuildAgain = true\n return\n }\n\n this.building = true\n if (!isWebpack5) {\n // Work around a bug in webpack, calling `invalidate` on Watching.js\n // doesn't trigger the invalid call used to keep track of the `.done` hook on multiCompiler\n for (const compiler of this.multiCompiler.compilers) {\n compiler.hooks.invalid.call()\n }\n }\n\n this.watcher.invalidate()\n }\n\n startBuilding() {\n this.building = true\n }\n\n doneBuilding() {\n this.building = false\n\n if (this.rebuildAgain) {\n this.rebuildAgain = false\n this.invalidate()\n }\n }\n}\n"]} |