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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 port = parseInt(process.env.PORT, 10) || 3000
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) => {
const queryParams = { id: req.params.id }
renderAndCache(req, res, '/blog', queryParams)
})
server.get('*', (req, res) => {
return handle(req, res)
})
server.listen(port, (err) => {
if (err) throw err
console.log(`> Ready on http://localhost:${port}`)
})
})
/*
* NB: make sure to modify this to take into account anything that should trigger
* an immediate page change (e.g a locale stored in req.session)
*/
function getCacheKey (req) {
return `${req.url}`
}
async function renderAndCache (req, res, pagePath, queryParams) {
const key = getCacheKey(req)
// If we have a page in the cache, let's serve it
if (ssrCache.has(key)) {
res.setHeader('x-cache', 'HIT')
res.send(ssrCache.get(key))
return
}
try {
// If not let's render the page into HTML
const html = await app.renderToHTML(req, res, pagePath, queryParams)
// Something is wrong with the request, let's skip the cache
if (res.statusCode !== 200) {
res.send(html)
return
}
// Let's cache this page
ssrCache.set(key, html)
res.setHeader('x-cache', 'MISS')
res.send(html)
} catch (err) {
app.renderError(err, req, res, pagePath, queryParams)
}
}