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next.js/examples/ssr-caching/server.js

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const express = require('express')
const next = require('next')
const LRUCache = require('lru-cache')
const dev = process.env.NODE_ENV !== 'production'
const app = next({ dir: '.', dev })
const handle = app.getRequestHandler()
// This is where we cache our rendered HTML pages
const ssrCache = new LRUCache({
max: 100,
maxAge: 1000 * 60 * 60 // 1hour
})
app.prepare()
.then(() => {
const server = express()
// Use the `renderAndCache` utility defined below to serve pages
server.get('/', (req, res) => {
renderAndCache(req, res, '/')
})
server.get('/blog/:id', (req, res) => {
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const queryParams = { id: req.params.id }
renderAndCache(req, res, '/blog', queryParams)
})
server.get('*', (req, res) => {
return handle(req, res)
})
server.listen(3000, (err) => {
if (err) throw err
console.log('> Ready on http://localhost:3000')
})
})
function renderAndCache (req, res, pagePath, queryParams) {
// If we have a page in the cache, let's serve it
if (ssrCache.has(req.url)) {
console.log(`CACHE HIT: ${req.url}`)
res.send(ssrCache.get(req.url))
return
}
// If not let's render the page into HTML
app.renderToHTML(req, res, pagePath, queryParams)
.then((html) => {
// Let's cache this page
console.log(`CACHE MISS: ${req.url}`)
ssrCache.set(req.url, html)
res.send(html)
})
.catch((err) => {
app.renderError(err, req, res, pagePath, queryParams)
})
}