tesjs/lib/events.js

A module to streamline the use of Twitch EventSub in Node.js and Web applications

// Copyright (c) 2020 Mitchell Adair
//
// This software is released under the MIT License.
// https://opensource.org/licenses/MIT

const logger = require("./logger");

class EventManager {
    constructor() {
        EventManager._instance = this;
        this._events = this._events || {};
        this._subscriptionQueue = this._subscriptionQueue || {};
    }

    fire(sub, data) {
        const handler = this._events[sub.type];
        if (!handler) {
            logger.warn(`Recieved event for unhandled type: ${sub.type}`);
            return false;
        } else {
            handler.call(this, data, sub);
            return true;
        }
    }

    addListener(type, handler) {
        if (typeof handler !== "function") {
            throw TypeError("Event handler must be a function");
        }

        this._events[type] = handler;
        return this;
    }

    removeListener(type) {
        if (this._events[type]) {
            delete this._events[type];
        }

        return this;
    }

    removeAllListeners() {
        this._events = {};
        return this;
    }

    queueSubscription(data, resolve, reject) {
        const id = data.data[0].id;
        this._subscriptionQueue[id] = {
            data,
            resolve,
            timeout: setTimeout(() => {
                reject({
                    message: "Subscription verification timed out, this will need to be cleaned up",
                    subscriptionID: id,
                });
                delete this._subscriptionQueue[id];
            }, 600000),
        };
        return this;
    }

    resolveSubscription(id) {
        if (!this._subscriptionQueue[id]) {
            return this;
        }

        const { resolve, timeout, data } = this._subscriptionQueue[id];
        clearTimeout(timeout);
        resolve(data);
        delete this._subscriptionQueue[id];
        return this;
    }
}

const instance = new EventManager();
module.exports = instance;