/**
 * Redis客户端封装。
 *
 * 注意Redis使用Promises保证调用流程。
 *
 * https://github.com/NodeRedis/node_redis
 *
 * author: linzhuo
 * since: 2016/12/09
 */
"use strict";
let redis = require('redis');
let Promise = require('bluebird');
let configFile = require('../../include/commons').CONFIG_FILE;
let config = require('../../resources/config/' + configFile);
let log = require("../../util/log.js");

let redisClient = null;

// 启用promises
Promise.promisifyAll(redis.RedisClient.prototype);
Promise.promisifyAll(redis.Multi.prototype);

class RedisClient {
    constructor() {
        this._connection = redis.createClient(
            config.redisConfig
        );

        this._connection.on('ready', function (res) {
            log.info('Redis is ready.');
        });
    }

    get connection() {
        return this._connection;
    }

    static redisClient() {
        if (redisClient == null) {
            redisClient = new RedisClient();
        }

        return redisClient;
    }
}

module.exports = RedisClient;