redis-plus-lru-cache/index.js

LRU Cache & Redis Middleware

var LRU = require("lru-cache");
var redis = require("redis");
var jsonify = require('redis-jsonify');
var lrucache;
var client;
//lrucache.reset();

var x = function (options) {
    console.log("options.flag",options.flag)
    if(options.flag){

        lrucache = LRU(options.lruCache);
        client = jsonify(redis.createClient(options.redis.port, options.redis.servers, {}));
        if(options.hasOwnProperty('prefix'))
            prefix = options.prefix
        else
            prefix = ""
        return {
            get: function (key, callback) {
                var error = null;
                if (lrucache.has(prefix + key)) {
                    return callback(error, lrucache.get(prefix + key));
                } else {
                    client.get(prefix + key, function (error, data) {
                        if (data) {
                            lrucache.set(prefix + key, data);
                            return callback(error, data);
                        } else {
                            return callback(error, null);
                        }
                    });
                }
            },
            set: function (key, data,callback) {
                lrucache.set(prefix + key, data);
                client.set(prefix + key, data, function () {
                    if (typeof callback == "function")
                        callback();
                });
            },
            flushLRUCache:function(){
                lrucache.reset();
            },
            flushRedis: function(){
                client.send_command("FLUSHALL", null, function(){
                    console.log("Redis Flushed")
                })
            },
            flushAll: function(){
                lrucache.reset();
                client.send_command("FLUSHALL", [], function(){
                    console.log("Redis Flushed")
                })
            },
            flushByPrefix: function(delPrefix){
                //client.send_command("COMMAND GETKEYS",["SET"],function(keys){
                //    console.log(keys+"key")
                //})
                lrucache.forEach(function(value,key,cache){
                    if(key.indexOf(delPrefix) == 0 )
                        lrucache.del( key)
                })

            }

        }
    } else {
        console.log("blank")
        return {
            get: function (key, callback) {
                var error = null;
                return callback(error, null);
            },
            set: function (key, data,callback) {
                var error = null;
                if (typeof callback == "function")
                    callback();

            }
        }

    }

};

module.exports = x