Forked from markselby/node-express-redis-cache.js
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August 29, 2015 13:56
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var zlib = require('zlib'); | |
var redis = require('redis'); | |
var redisClient = redis.createClient(); | |
var crypto = require('crypto'); | |
// Our custom caching write function | |
function cached(body, lifetime, type) { | |
var key = this.req.originalUrl; | |
var res = this; | |
var etag, len; | |
if (typeof body === 'object') { | |
body = JSON.stringify(body); | |
} | |
zlib.gzip(body, function(err, result) { | |
if (err) return; | |
len = result.length; | |
etag = crypto.createHash('md5').update(result).digest('hex'); | |
// Send the result to the client first | |
res.setHeader('ETag', etag); | |
res.setHeader('Cache-Control', 'max-age=' + lifetime); | |
res.setHeader('Content-Encoding', 'gzip'); | |
res.setHeader('Content-Length', len); | |
res.setHeader('Content-Type', type); | |
res.end(result, 'binary'); | |
// Add the result to the Redis cache | |
var hash = { | |
etag: etag, | |
max_age: lifetime, | |
content_type: type, | |
content_length: len, | |
content_encoding: 'gzip' | |
}; | |
redisClient.hmset(key + '-meta', hash, redis.print); | |
redisClient.set(key + '-content', result, redis.print); | |
redisClient.expire(key + '-meta', lifetime); | |
redisClient.expire(key + '-content', lifetime); | |
}); | |
}; | |
// Now configure Express to know about the caching function | |
var express = require('express'); | |
var response = express.response; | |
response.cached = cached; | |
// An example of using this for a request, 300 being the number of seconds that Redis will keep it for. | |
function someRoute(req, res) { | |
var content = "blah, blah, blah"; | |
res.cached(content, 300, 'text/html'); | |
} |
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