@aarconada/urserver/redis.js

Basic Server definitions to develope REST API with a node + express Server

/**
 * Created by ubuntu on 16/08/18.
 */
'use strict';
const _                     = require('lodash');
const promise               = require('bluebird');
const redis                 = require('redis');
const server                = require('./server')();
var client;

function openRedisConnection() {
    if(client && client.connected) return client;
    if(client) client.end();
    client = redis.createClient(server.configuration.redis.connection.port, server.configuration.redis.connection.host, server.configuration.redis.connection.options);
    client.on('error', (err) => {
        server.debug('REDIS ERROR', err);
        server.utils.throwError(server.defaultResponses.redis_connection_error);
    });
    client.on('connection', () => {
        server.debug('REDIS CONNECTED');
    });
    //if(server.configuration.redis.allowConfig === true) {
    //    client.config("SET", "notify-keyspace-events", "Ex");
    //}
    return client;
}

function getExpiryTime(key) {
    return server.configuration.redis.expiration;
}

//*** Get Key-Value pair ***/
module.exports.getRedisValue = function(key){
    return new promise((resolve, reject) => {
        openRedisConnection().get(key, function(err, value) {
            resolve([value], err);
        });
    });

};
//*** Set Key-Value pair ***/
module.exports.setRedisValue = function(key, value) {
    return new promise((resolve, reject) => {
        openRedisConnection().set(key, value, function(err, value) {
            if(!_.isUndefined(err) && !_.isNull(err)) reject(err);
            else resolve(value);
        });
    });
};
module.exports.removeRedisValue = function(key) {
    return new promise((resolve, reject) => {
        openRedisConnection().del(key, function(err, value) {
            if(!_.isUndefined(err) && !_.isNull(err)) reject(err);
            else resolve(value);
        });
    });
};