brussell98/Mirai

/**
 * Manages external connections to and from the bot
 * @abstract
 */
class AbstractMiddleware {
    /**
     * Creates a new AbstractMiddleware
     * @abstract
     */
    constructor() {
        if (this.constructor === AbstractMiddleware)
            throw new Error("Can't instantiate an abstract class!");
    }

    /**
     * The name of the middleware
     * @type {String}
     * @abstract
     */
    get name() {
        throw new Error('name must be overwritten');
    }

    /**
     * Loads the middleware
     * @param {Bot} bot The main client
     * @returns {Promise} Resolves with `this`
     */
    load(bot) {
        this.logger = bot.logger;
        this.bot = bot;
        return Promise.resolve(this);
    }

    /**
     * Destroys/unloads the middleware
     * @returns {Promise} Resolves with no value
     */
    destroy() {
        this.logger = undefined;
        this.bot = undefined;
        return Promise.resolve();
    }
}

module.exports = AbstractMiddleware;