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server.js
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server.js
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const cacheableResponse = require('cacheable-response');
const express = require('express');
const next = require('next');
const config = require('config');
const { Mutex } = require('async-mutex');
const cookieParser = require('cookie-parser');
const port = parseInt(process.env.PORT, 10);
const app = next({ dev: false }); // only for prod mode
const handle = app.getRequestHandler();
const mutexMap = {};
const getSrrCache = (ttl) => cacheableResponse({
ttl,
get: async ({ req, res }) => {
const data = await app.renderToHTML(req, res, req.path, {
...req.query,
...req.params,
});
if (res.statusCode === 404) {
res.end(data);
return {};
}
return { data };
},
send: ({ data, res }) => res.send(data),
});
const noStaticCache = getSrrCache(config.TTL_NO_STATIC);
const lockWrapper = async (req, res, typeCash) => {
if (!mutexMap[req.originalUrl]) {
mutexMap[req.originalUrl] = new Mutex();
}
const release = await mutexMap[req.originalUrl].acquire();
try {
await typeCash({ req, res });
} finally {
release();
}
};
app.prepare().then(() => {
const server = express();
server.use(cookieParser());
server.get('/', (req, res) => lockWrapper(req, res, noStaticCache));
server.get('*', (req, res) => handle(req, res));
server.listen(port, (err) => {
if (err) throw err;
// eslint-disable-next-line no-console
console.log(`> Ready on: ${port}`);
});
});