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react-code-dataset / spectrum /hyperion /renderer /index.js
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 // @flow
// Server-side renderer for our React code
const debug = require('debug')('hyperion:renderer');
import React from 'react';
// $FlowIssue
import { renderToNodeStream } from 'react-dom/server';
import { ServerStyleSheet } from 'styled-components';
import { ApolloProvider, getDataFromTree } from 'react-apollo';
import { ApolloClient } from 'apollo-client';
import { SchemaLink } from 'apollo-link-schema';
import schema from 'api/schema';
import createLoaders from 'api/loaders';
import { createHttpLink } from 'apollo-link-http';
import {
InMemoryCache,
IntrospectionFragmentMatcher,
} from 'apollo-cache-inmemory';
import { StaticRouter } from 'react-router';
import { Provider } from 'react-redux';
import { HelmetProvider } from 'react-helmet-async';
import Loadable from 'react-loadable';
import { getBundles } from 'react-loadable/webpack';
import Raven from 'shared/raven';
import introspectionQueryResultData from 'shared/graphql/schema.json';
// $FlowIssue
import stats from '../../build/react-loadable.json';
import getSharedApolloClientOptions from 'shared/graphql/apollo-client-options';
import { getFooter, getHeader } from './html-template';
// Browser shim has to come before any client imports
import './browser-shim';
const Routes = require('../../src/routes').default;
import { initStore } from '../../src/store';
const IN_MAINTENANCE_MODE =
process.env.REACT_APP_MAINTENANCE_MODE === 'enabled';
const IS_PROD = process.env.NODE_ENV === 'production';
const FORCE_DEV = process.env.FORCE_DEV;
const FIVE_MINUTES = 300;
const ONE_HOUR = 3600;
if (!IS_PROD || FORCE_DEV) debug('Querying API at localhost:3001/api');
const renderer = (req: express$Request, res: express$Response) => {
res.setHeader('Content-Type', 'text/html; charset=utf-8');
if (IN_MAINTENANCE_MODE) {
res.status(500);
res.send(
`<!DOCTYPE html><html><head><title>Spectrum</title> <style>body{margin: 0;}html{-webkit-font-smoothing: antialiased; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';}h1, p{line-height: 1.5;}.container{background: rgb(56,24,229);background: linear-gradient(90deg, rgba(56,24,229,1) 0%, rgba(56,24,229,0.8029586834733894) 52%, rgba(56,24,229,1) 100%); width: 100%; display: flex; height: 100vh; justify-content: center;}.item{color: white; font-weight: bold; align-self: center; text-align: center;}a{color: white;}span{font-size: 40px; padding: 0; margin: 0;}</style></head><body> <div class="container"> <div class="item"> <span>🛠</span> <h1>We are currently undergoing maintenance.</h1> <p>We'll be back shortly. Follow <a href="https://twitter.com/withspectrum">@withspectrum on Twitter</a> to stay up to date. </p></div></div></body></html>`
);
return;
}
debug(`server-side render ${req.url}`);
debug(`querying API at https://${req.hostname}/api`);
const schemaLink = new SchemaLink({
schema,
context: {
user: req.user || null,
loaders: createLoaders(),
},
});
const cache = new InMemoryCache({
fragmentMatcher: new IntrospectionFragmentMatcher({
introspectionQueryResultData,
}),
...getSharedApolloClientOptions(),
});
// Get the nonce attached to every request
// This nonce is generated by our security middleware
const nonce =
typeof res.locals.nonce === 'string' ? res.locals.nonce : undefined;
if (!nonce) throw new Error('Security nonce not set.');
// Create an Apollo Client with a local network interface
const client = new ApolloClient({
ssrMode: true,
link: schemaLink,
cache,
});
// Define the initial redux state
const { t } = req.query;
const initialReduxState = {};
// Create the Redux store
const store = initStore(initialReduxState);
let modules = [];
const report = moduleName => {
modules.push(moduleName);
};
let routerContext = {};
let helmetContext = {};
// Initialise the styled-components stylesheet and wrap the app with it
const sheet = new ServerStyleSheet();
const frontend = sheet.collectStyles(
<Loadable.Capture report={report}>
<ApolloProvider client={client}>
<HelmetProvider context={helmetContext}>
<Provider store={store}>
<StaticRouter location={req.url} context={routerContext}>
<Routes maintenanceMode={IN_MAINTENANCE_MODE} />
</StaticRouter>
</Provider>
</HelmetProvider>
</ApolloProvider>
</Loadable.Capture>
);
debug('get data from tree');
getDataFromTree(frontend)
.then(() => {
debug('got data from tree');
if (routerContext.url) {
debug('found redirect on frontend, redirecting');
// Somewhere a `<Redirect>` was rendered, so let's redirect server-side
res.redirect(301, routerContext.url);
return;
}
// maintenance mode
if (IN_MAINTENANCE_MODE) {
debug('maintenance mode enabled, sending 503');
res.status(503);
res.set('Retry-After', '3600');
} else {
res.status(200);
}
const state = store.getState();
const data = client.extract();
const { helmet } = helmetContext;
debug('write header');
// Use now's CDN to cache the rendered pages in CloudFlare for half an hour
// Ref https://vercel.co/docs/features/cdn
if (!req.user) {
res.setHeader(
'Cache-Control',
`s-maxage=${ONE_HOUR}, stale-while-revalidate=${FIVE_MINUTES}, must-revalidate`
);
} else {
res.setHeader('Cache-Control', 's-maxage=0, private');
}
res.write(
getHeader({
metaTags:
helmet.title.toString() +
helmet.meta.toString() +
helmet.link.toString(),
nonce: nonce,
})
);
const stream = sheet.interleaveWithNodeStream(
renderToNodeStream(frontend)
);
stream.pipe(
res,
{ end: false }
);
const bundles = getBundles(stats, modules)
// Create <script defer> tags from bundle objects
.map(bundle => `/${bundle.file.replace(/\.map$/, '')}`)
// Make sure only unique bundles are included
.filter((value, index, self) => self.indexOf(value) === index);
debug('bundles used:', bundles.join(','));
stream.on('end', () =>
res.end(
getFooter({
state,
data,
bundles,
nonce: nonce,
})
)
);
})
.catch(err => {
// Avoid memory leaks, see https://github.com/styled-components/styled-components/issues/1624#issuecomment-425382979
sheet.seal();
console.error(err);
const sentryId =
process.env.NODE_ENV === 'production'
? Raven.captureException(err)
: 'Only output in production.';
res.status(500);
res.send(
`<!DOCTYPE html><html><head><title>Spectrum</title> <style>body{margin: 0;}html{-webkit-font-smoothing: antialiased; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';}h1, p{line-height: 1.5;}.container{background: rgb(56,24,229);background: linear-gradient(90deg, rgba(56,24,229,1) 0%, rgba(56,24,229,0.8029586834733894) 52%, rgba(56,24,229,1) 100%); width: 100%; display: flex; height: 100vh; justify-content: center;}.item{color: white; font-weight: bold; align-self: center; text-align: center;}a{color: white;}span{font-size: 40px; padding: 0; margin: 0;}</style></head><body> <div class="container"> <div class="item"> <span>😢</span> <h1>Oops, something went wrong. Sorry!</h1> <p>Please refresh the page.</p></div></div></body></html>`
);
});
};
export default renderer;