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![Olivier Tassinari](/assets/img/avatar_default.png)
* [ssr-caching] Only cache 200 requests I'm assuming caching an error page is a bad pattern. * Update server.js
77 lines
1.8 KiB
JavaScript
77 lines
1.8 KiB
JavaScript
const express = require('express')
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const next = require('next')
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const LRUCache = require('lru-cache')
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const port = parseInt(process.env.PORT, 10) || 3000
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const dev = process.env.NODE_ENV !== 'production'
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const app = next({ dir: '.', dev })
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const handle = app.getRequestHandler()
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// This is where we cache our rendered HTML pages
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const ssrCache = new LRUCache({
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max: 100,
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maxAge: 1000 * 60 * 60 // 1hour
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})
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app.prepare()
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.then(() => {
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const server = express()
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// Use the `renderAndCache` utility defined below to serve pages
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server.get('/', (req, res) => {
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renderAndCache(req, res, '/')
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})
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server.get('/blog/:id', (req, res) => {
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const queryParams = { id: req.params.id }
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renderAndCache(req, res, '/blog', queryParams)
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})
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server.get('*', (req, res) => {
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return handle(req, res)
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})
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server.listen(port, (err) => {
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if (err) throw err
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console.log(`> Ready on http://localhost:${port}`)
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})
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})
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/*
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* NB: make sure to modify this to take into account anything that should trigger
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* an immediate page change (e.g a locale stored in req.session)
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*/
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function getCacheKey (req) {
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return `${req.url}`
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}
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async function renderAndCache (req, res, pagePath, queryParams) {
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const key = getCacheKey(req)
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// If we have a page in the cache, let's serve it
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if (ssrCache.has(key)) {
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res.setHeader('x-cache', 'HIT')
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res.send(ssrCache.get(key))
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return
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}
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try {
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// If not let's render the page into HTML
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const html = await app.renderToHTML(req, res, pagePath, queryParams)
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// Something is wrong with the request, let's skip the cache
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if (res.statusCode !== 200) {
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res.send(html)
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return
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}
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// Let's cache this page
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ssrCache.set(key, html)
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res.setHeader('x-cache', 'MISS')
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res.send(html)
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} catch (err) {
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app.renderError(err, req, res, pagePath, queryParams)
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}
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}
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