| 1 | 'use strict'; |
| 2 | |
| 3 | // This is a server to host CDN distributed resources like Webpack bundles and SSR |
| 4 | |
| 5 | const path = require('path'); |
| 6 | |
| 7 | // Do this as the first thing so that any code reading it knows the right env. |
| 8 | process.env.BABEL_ENV = process.env.NODE_ENV; |
| 9 | |
| 10 | const babelRegister = require('@babel/register'); |
| 11 | babelRegister({ |
| 12 | babelrc: false, |
| 13 | ignore: [ |
| 14 | /\/(build|node_modules)\//, |
| 15 | function (file) { |
| 16 | if ((path.dirname(file) + '/').startsWith(__dirname + '/')) { |
| 17 | // Ignore everything in this folder |
| 18 | // because it's a mix of CJS and ESM |
| 19 | // and working with raw code is easier. |
| 20 | return true; |
| 21 | } |
| 22 | return false; |
| 23 | }, |
| 24 | ], |
| 25 | presets: ['@babel/preset-react'], |
| 26 | }); |
| 27 | |
| 28 | // Ensure environment variables are read. |
| 29 | require('../config/env'); |
| 30 | |
| 31 | const fs = require('fs').promises; |
| 32 | const compress = require('compression'); |
| 33 | const chalk = require('chalk'); |
| 34 | const express = require('express'); |
| 35 | const http = require('http'); |
| 36 | const React = require('react'); |
| 37 | |
| 38 | const {renderToPipeableStream} = require('react-dom/server'); |
| 39 | const {createFromNodeStream} = require('react-server-dom-unbundled/client'); |
| 40 | const {PassThrough} = require('stream'); |
| 41 | |
| 42 | const app = express(); |
| 43 | |
| 44 | app.use(compress()); |
| 45 | |
| 46 | if (process.env.NODE_ENV === 'development') { |
| 47 | // In development we host the Webpack server for live bundling. |
| 48 | const webpack = require('webpack'); |
| 49 | const webpackMiddleware = require('webpack-dev-middleware'); |
| 50 | const webpackHotMiddleware = require('webpack-hot-middleware'); |
| 51 | const paths = require('../config/paths'); |
| 52 | const configFactory = require('../config/webpack.config'); |
| 53 | const getClientEnvironment = require('../config/env'); |
| 54 | |
| 55 | const env = getClientEnvironment(paths.publicUrlOrPath.slice(0, -1)); |
| 56 | |
| 57 | const config = configFactory('development'); |
| 58 | const protocol = process.env.HTTPS === 'true' ? 'https' : 'http'; |
| 59 | const appName = require(paths.appPackageJson).name; |
| 60 | |
| 61 | // Create a webpack compiler that is configured with custom messages. |
| 62 | const compiler = webpack(config); |
| 63 | app.use( |
| 64 | webpackMiddleware(compiler, { |
| 65 | publicPath: paths.publicUrlOrPath.slice(0, -1), |
| 66 | serverSideRender: true, |
| 67 | headers: () => { |
| 68 | return { |
| 69 | 'Cache-Control': 'no-store, must-revalidate', |
| 70 | }; |
| 71 | }, |
| 72 | }) |
| 73 | ); |
| 74 | app.use(webpackHotMiddleware(compiler)); |
| 75 | } |
| 76 | |
| 77 | function request(options, body) { |
| 78 | return new Promise((resolve, reject) => { |
| 79 | const req = http.request(options, res => { |
| 80 | resolve(res); |
| 81 | }); |
| 82 | req.on('error', e => { |
| 83 | reject(e); |
| 84 | }); |
| 85 | body.pipe(req); |
| 86 | }); |
| 87 | } |
| 88 | |
| 89 | async function renderApp(req, res, next) { |
| 90 | // Proxy the request to the regional server. |
| 91 | const proxiedHeaders = { |
| 92 | 'X-Forwarded-Host': req.hostname, |
| 93 | 'X-Forwarded-For': req.ips, |
| 94 | 'X-Forwarded-Port': 3000, |
| 95 | 'X-Forwarded-Proto': req.protocol, |
| 96 | }; |
| 97 | // Proxy other headers as desired. |
| 98 | if (req.get('rsc-action')) { |
| 99 | proxiedHeaders['Content-type'] = req.get('Content-type'); |
| 100 | proxiedHeaders['rsc-action'] = req.get('rsc-action'); |
| 101 | } else if (req.get('Content-type')) { |
| 102 | proxiedHeaders['Content-type'] = req.get('Content-type'); |
| 103 | } |
| 104 | if (req.headers['cache-control']) { |
| 105 | proxiedHeaders['Cache-Control'] = req.get('cache-control'); |
| 106 | } |
| 107 | if (req.get('rsc-request-id')) { |
| 108 | proxiedHeaders['rsc-request-id'] = req.get('rsc-request-id'); |
| 109 | } |
| 110 | |
| 111 | const requestsPrerender = req.path === '/prerender'; |
| 112 | |
| 113 | const promiseForData = request( |
| 114 | { |
| 115 | host: '127.0.0.1', |
| 116 | port: 3001, |
| 117 | method: req.method, |
| 118 | path: requestsPrerender ? '/?prerender=1' : '/', |
| 119 | headers: proxiedHeaders, |
| 120 | }, |
| 121 | req |
| 122 | ); |
| 123 | |
| 124 | if (req.accepts('text/html')) { |
| 125 | try { |
| 126 | const rscResponse = await promiseForData; |
| 127 | |
| 128 | let virtualFs; |
| 129 | let buildPath; |
| 130 | if (process.env.NODE_ENV === 'development') { |
| 131 | const {devMiddleware} = res.locals.webpack; |
| 132 | virtualFs = devMiddleware.outputFileSystem.promises; |
| 133 | buildPath = devMiddleware.stats.toJson().outputPath; |
| 134 | } else { |
| 135 | virtualFs = fs; |
| 136 | buildPath = path.join(__dirname, '../build/'); |
| 137 | } |
| 138 | // Read the module map from the virtual file system. |
| 139 | const serverConsumerManifest = JSON.parse( |
| 140 | await virtualFs.readFile( |
| 141 | path.join(buildPath, 'react-ssr-manifest.json'), |
| 142 | 'utf8' |
| 143 | ) |
| 144 | ); |
| 145 | |
| 146 | // Read the entrypoints containing the initial JS to bootstrap everything. |
| 147 | // For other pages, the chunks in the RSC payload are enough. |
| 148 | const mainJSChunks = JSON.parse( |
| 149 | await virtualFs.readFile( |
| 150 | path.join(buildPath, 'entrypoint-manifest.json'), |
| 151 | 'utf8' |
| 152 | ) |
| 153 | ).main.js; |
| 154 | // For HTML, we're a "client" emulator that runs the client code, |
| 155 | // so we start by consuming the RSC payload. This needs a module |
| 156 | // map that reverse engineers the client-side path to the SSR path. |
| 157 | |
| 158 | // We need to get the formState before we start rendering but we also |
| 159 | // need to run the Flight client inside the render to get all the preloads. |
| 160 | // The API is ambivalent about what's the right one so we need two for now. |
| 161 | |
| 162 | // Tee the response into two streams so that we can do both. |
| 163 | const rscResponse1 = new PassThrough(); |
| 164 | const rscResponse2 = new PassThrough(); |
| 165 | |
| 166 | rscResponse.pipe(rscResponse1); |
| 167 | rscResponse.pipe(rscResponse2); |
| 168 | |
| 169 | const {formState} = await createFromNodeStream( |
| 170 | rscResponse1, |
| 171 | serverConsumerManifest |
| 172 | ); |
| 173 | rscResponse1.end(); |
| 174 | |
| 175 | let cachedResult; |
| 176 | let Root = () => { |
| 177 | if (!cachedResult) { |
| 178 | // Read this stream inside the render. |
| 179 | cachedResult = createFromNodeStream( |
| 180 | rscResponse2, |
| 181 | serverConsumerManifest |
| 182 | ); |
| 183 | } |
| 184 | return React.use(cachedResult).root; |
| 185 | }; |
| 186 | // Render it into HTML by resolving the client components |
| 187 | res.set('Content-type', 'text/html'); |
| 188 | const {pipe} = renderToPipeableStream(React.createElement(Root), { |
| 189 | bootstrapScripts: mainJSChunks, |
| 190 | formState: formState, |
| 191 | onShellReady() { |
| 192 | pipe(res); |
| 193 | }, |
| 194 | onShellError(error) { |
| 195 | const {pipe: pipeError} = renderToPipeableStream( |
| 196 | React.createElement('html', null, React.createElement('body')), |
| 197 | { |
| 198 | bootstrapScripts: mainJSChunks, |
| 199 | } |
| 200 | ); |
| 201 | pipeError(res); |
| 202 | }, |
| 203 | }); |
| 204 | } catch (e) { |
| 205 | console.error(`Failed to SSR: ${e.stack}`); |
| 206 | res.statusCode = 500; |
| 207 | res.end(); |
| 208 | } |
| 209 | } else { |
| 210 | try { |
| 211 | const rscResponse = await promiseForData; |
| 212 | // For other request, we pass-through the RSC payload. |
| 213 | res.set('Content-type', 'text/x-component'); |
| 214 | rscResponse.on('data', data => { |
| 215 | res.write(data); |
| 216 | res.flush(); |
| 217 | }); |
| 218 | rscResponse.on('end', data => { |
| 219 | res.end(); |
| 220 | }); |
| 221 | } catch (e) { |
| 222 | console.error(`Failed to proxy request: ${e.stack}`); |
| 223 | res.statusCode = 500; |
| 224 | res.end(); |
| 225 | } |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | app.all('/', renderApp); |
| 230 | app.all('/prerender', renderApp); |
| 231 | |
| 232 | if (process.env.NODE_ENV === 'development') { |
| 233 | app.use(express.static('public')); |
| 234 | |
| 235 | app.get('/source-maps', async function (req, res, next) { |
| 236 | // Proxy the request to the regional server. |
| 237 | const proxiedHeaders = { |
| 238 | 'X-Forwarded-Host': req.hostname, |
| 239 | 'X-Forwarded-For': req.ips, |
| 240 | 'X-Forwarded-Port': 3000, |
| 241 | 'X-Forwarded-Proto': req.protocol, |
| 242 | }; |
| 243 | |
| 244 | const promiseForData = request( |
| 245 | { |
| 246 | host: '127.0.0.1', |
| 247 | port: 3001, |
| 248 | method: req.method, |
| 249 | path: req.originalUrl, |
| 250 | headers: proxiedHeaders, |
| 251 | }, |
| 252 | req |
| 253 | ); |
| 254 | |
| 255 | try { |
| 256 | const rscResponse = await promiseForData; |
| 257 | res.set('Content-type', 'application/json'); |
| 258 | rscResponse.on('data', data => { |
| 259 | res.write(data); |
| 260 | res.flush(); |
| 261 | }); |
| 262 | rscResponse.on('end', data => { |
| 263 | res.end(); |
| 264 | }); |
| 265 | } catch (e) { |
| 266 | console.error(`Failed to proxy request: ${e.stack}`); |
| 267 | res.statusCode = 500; |
| 268 | res.end(); |
| 269 | } |
| 270 | }); |
| 271 | } else { |
| 272 | // In production we host the static build output. |
| 273 | app.use(express.static('build')); |
| 274 | } |
| 275 | |
| 276 | app.listen(3000, () => { |
| 277 | console.log('Global Fizz/Webpack Server listening on port 3000...'); |
| 278 | }); |
| 279 | |
| 280 | app.on('error', function (error) { |
| 281 | if (error.syscall !== 'listen') { |
| 282 | throw error; |
| 283 | } |
| 284 | |
| 285 | switch (error.code) { |
| 286 | case 'EACCES': |
| 287 | console.error('port 3000 requires elevated privileges'); |
| 288 | process.exit(1); |
| 289 | break; |
| 290 | case 'EADDRINUSE': |
| 291 | console.error('Port 3000 is already in use'); |
| 292 | process.exit(1); |
| 293 | break; |
| 294 | default: |
| 295 | throw error; |
| 296 | } |
| 297 | }); |