@coolgk/utils/cache.js

javascript, typescript utility and wrapper functions and classes: array, string, base64, ampq, bcrypt, cache, captcha, csv, email, jwt, number, pdf, tmp, token, unit conversion, url params, session, form data, google sign in, facebook sign in

/*!
 * @package @coolgk/utils
 * @version 3.1.4
 * @link https://github.com/coolgk/node-utils
 * @license MIT
 * @author Daniel Gong <daniel.k.gong@gmail.com>
 *
 * Copyright (c) 2017 Daniel Gong <daniel.k.gong@gmail.com>. All rights reserved.
 * Licensed under the MIT License.
 */

"use strict";
/*!
 *  Copyright (c) 2017 Daniel Gong <daniel.k.gong@gmail.com>. All rights reserved.
 *  Licensed under the MIT License.
 */
Object.defineProperty(exports, "__esModule", { value: true });
class Cache {
    constructor(options) {
        this._redisClient = options.redisClient;
    }
    set(name, value, expiry = 0) {
        const stringValue = JSON.stringify(value);
        return expiry ? this.command('setex', name, expiry, stringValue) : this.command('set', name, stringValue);
    }
    get(name) {
        return this.command('get', name).then((value) => JSON.parse(value));
    }
    delete(name) {
        return this.command('del', name);
    }
    getSetIfNull(name, callback, expiry = 0) {
        return this.get(name).then((cachedValue) => {
            if (null === cachedValue) {
                return Promise.resolve(callback()).then((value) => this.set(name, value, expiry).then(() => value));
            }
            return cachedValue;
        });
    }
    command(command, ...params) {
        return new Promise((resolve, reject) => {
            params.push((error, response) => {
                error ? reject(error) : resolve(response);
            });
            this._redisClient[command](...params);
        });
    }
}
exports.Cache = Cache;
exports.default = Cache;