Storing Counters In Redis

redis-counters.js

// Additional code in node-http-proxy.js

var crypto = require('crypto');
var redis = require('redis');

var client = redis.createClient(config.opt.redis_port, 'cloudno.de');
client.auth(config.opt.redis_auth, function(result) {
	util.log("Redis authenticated.");
})

client.on("error", function (err) {
    util.log("Redis error: " + err);
});

// .. code to process the request ..

  // log to redis
  if (client && client.connected) {
	var appName = lookup_app(options.port);
	
	if (appName) {
	    var ip = req.headers["x-forwarded-for"];
	    var referer = req.headers.referer;
	    var date = new Date();
	    var month = date.getUTCMonth() + 1;
	    var day = date.getUTCFullYear() + "-" + month + "-" + date.getUTCDate();
	    var urlhash;
		
	    var keys = [
	    	"hits-by-app:" + appName,
	    	"hits-by-day:" + day,
		"hits-by-app-by-day:" + appName + ':' + day,
		"hits-by-app-by-month:" + appName + ':' + month, 
		"hits-by-ip:" + ip,
		"hits-by-ip-by-day:" + ip + ':' + day
	    ];

	    if (referer) {
	 	urlhash = crypto.createHash("md5").update(referer).digest("hex");
		keys.push("hits-by-url:" + urlhash); 
		keys.push("hits-by-url-by-day:" + urlhash + ":" + day);
		client.set("url:" + urlhash, referer);
	    }
		
	    for (i in keys) {
	    	client.incr(keys[i]);
	    }
	}
  }