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Node.js page caching

Is there an easy way to cache pages in Express, preferably Memcached? I am using Jade as my templating system. I am looking to cache specific pages for visitors in about 30 seconds. He uses it preferably express.render

, but I'm open to suggestions. Thank!

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2 answers


You need to process the rendering result.

var cache = {};

var getPageFromCache(url, callback) {
    if (cache[url]) {
        // Get page from cache
        callback(undefined, cache[url]);
    } else {
        // Get nothing
        callback();
    }
};

var setPageToCache(url, content) {
    // Save to cache
    cache[url] = content;
};

app.get('/', function(req, res){
    getPageFromCache(req.url, function(err, content) {
        if (err) return req.next(err);
        if (content) {
            res.send(content);
        } else {
            res.render('index.jade', { title: 'My Site' }, function(err, content) {
                // Render handler
                if (err) return req.next(err);
                setPageToCache(req.url, page);
                res.send(content);
            });
        }
    });
});


Implement getPageFromCache and setPageToCache to work with memcached if you need.

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I am using a simple package: cacher , this is an explicit middleware page caching supported by memcached.

Usage example:



var Cacher = require("cacher")
var cacher = new Cacher("myhost:11211")

// as a global middleware
app.use(cacher.cacheHourly())
// or per route
app.get("/long-cache", cacher.cacheDaily(), ...)
app.get("/short-cache", cacher.cacheOneMinute(), ...)
app.get("/no-cache", ...)

// listen for events
cacher.on("hit", function(url) {
  console.log("woohoo!", url)
})

cacher.on("miss", function(url) {
  console.log("doh!", url)
})

cacher.on("error", function(err) {
  console.log(err)
})

See also the project on GitHub

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