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index.js
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/* eslint-disable no-console */
const fs = require('fs'),
path = require('path'),
polka = require('polka'),
serveStatic = require('serve-static'),
serveFavicon = require('serve-favicon'),
// safely serializes any data including functions
serialize = require('serialize-javascript'),
vueSR = require('vue-server-renderer');
// application variables
const port = process.env.PORT || 8080,
production = process.env.NODE_ENV === 'production',
config = {
production,
port,
apiBaseUrl: {
server: process.env.API_BASE_SSR && (process.env.API_BASE_SSR.replace(/\/$/, '') + '/') || `http://localhost:${port}/`,
client: process.env.API_BASE_CLIENT && (process.env.API_BASE_CLIENT.replace(/\/$/, '') + '/') || '/',
},
proxyEnabled: process.env.PROXY_ENABLED || !production,
};
let pe;
if (!production) pe = new (require('pretty-error'))();
const formatError = production ? err => err.stack : err => pe.render(err);
let layout, renderer;
/**
* Split layout HTML allowing server renderer to inject component output, store data, meta tags, etc.
* @param {string} html layout HTML
* @return {[function,string]} [
* function({string} meta tags, {string} attributes for <html>, {string} attributes for body),
* {string} page ending
* ]
*/
function parseLayout(html) {
let layout = html.split('<html>');
const start = layout[0] + '<html';
layout = layout[1].split('</head>');
const head = '>' + layout[0];
layout = layout[1].split('<body>');
const body = '</head>' + layout[0] + '<body';
layout = layout[1].split('<!--APP-->');
const afterBody = '>' + layout[0];
const end = layout[1];
return [
// before app layout
(headMeta, htmlAttrs, bodyAttrs) => {
headMeta = headMeta || '';
htmlAttrs = htmlAttrs.replace('data-meta=""', '');
bodyAttrs = bodyAttrs.replace('data-meta=""', '');
htmlAttrs = ' data-meta-ssr' + (htmlAttrs ? (' ' + htmlAttrs) : '');
bodyAttrs = bodyAttrs ? (' ' + bodyAttrs.replace('data-meta=""', '')) : '';
return start + htmlAttrs +
head + headMeta +
body + bodyAttrs +
afterBody;
},
// after app layout
end,
];
}
console.log('Starting app server...');
const app = polka();
if (config.proxyEnabled) require('./setup-proxy')(app, config);
if (config.production) {
layout = parseLayout(fs.readFileSync(path.resolve('./dist/index.html'), 'utf-8'));
renderer = vueSR.createBundleRenderer(path.resolve('./dist/server/vue-ssr-server-bundle.json'), {
runInNewContext: false,
clientManifest: require('./dist/vue-ssr-client-manifest.json'),
});
app.use('/dist', serveStatic('./dist/public'));
}
else {
require('./build/setup-dev-server')(app, {
bundleUpdated(bundle) {
renderer = vueSR.createBundleRenderer(bundle);
},
layoutUpdated(html) {
layout = parseLayout(html);
},
});
}
app.use(serveFavicon(path.join(process.cwd(), 'favicon.ico')));
app.get('*', (req, res) => {
if (!renderer || !layout) return res.end('Compiling app, refresh in a moment...');
res.setHeader('Content-Type', 'text/html');
req.envConfig = {
apiBaseUrl: config.apiBaseUrl.server,
};
const clientEnvConfig = {
apiBaseUrl: config.apiBaseUrl.client,
};
const context = req,
stream = renderer.renderToStream(context);
let body = [],
errorOccurred = false;
stream.once('data', () => {
try {
// get head data from the vue-meta plugin
const {
meta, title, link, style, script, noscript,
htmlAttrs,
bodyAttrs,
} = context.meta.inject();
body.push(layout[0](
// <head> ...
[meta, title, link, style, script, noscript].reduce((acc, el) => acc + el.text(), '') +
context.renderResourceHints() + context.renderStyles(),
// <html ATTRS>
htmlAttrs.text(),
// <body ATTRS>
bodyAttrs.text()
));
}
catch (err) {
stream.destroy(err);
}
});
stream.on('data', chunk => {
if (errorOccurred) return;
body.push(chunk);
});
stream.on('end', () => {
if (errorOccurred) return;
if (context.storeState && context.storeState.serverError)
// let application handle server error if possible
console.error(context.storeState.serverError);
res.statusCode = context.statusCode || 200;
body.forEach(chunk => { res.write(chunk); });
const injectData = { cfg: clientEnvConfig };
if (context.storeState) injectData.state = context.storeState;
if (context.componentStates) injectData.cmp = context.componentStates;
res.write(`<script>window.__APP__=${serialize(injectData)}</script>`);
res.write(context.renderScripts());
res.end(layout[1]);
});
stream.on('error', err => {
errorOccurred = true;
res.statusCode = 500;
console.error(formatError(err));
res.end(config.production ? 'Something went wrong...' : `<pre>${err.stack}\n\n<b>Watch console for more information</b></pre>`);
});
});
app.listen(config.port);
console.log('Server listening on port ' + config.port);
// handle system signals
if (config.production) {
const signals = {
SIGHUP: 1,
SIGINT: 2,
SIGTERM: 15,
};
Object.keys(signals).forEach((signal) => {
process.on(signal, () => {
console.log(`Received ${signal} ${signals[signal]}, shutting down the server...`);
app.server.close(() => {
console.log('Server stopped');
process.exit(128 + signals[signal]);
});
});
});
}