node-schedule-queue/lib/scheduleQueue.js

Promise queue with schedule

"use strict";
const Queue = require("promise-queue");
const Schedule = require("node-schedule");
const EventEmitter = require("events").EventEmitter;

function create(name, cron, job, pending=1) {

	const queue = new Queue(pending, Infinity);
	const eventEmitter = new EventEmitter();
	const emit = eventEmitter.emit.bind(eventEmitter);

	function invoke() {
		return new Promise((resolve, reject) => {
			queue.add(async function () {
				try {
					const data = await job(emit);
					return resolve(data);
				} catch (error) {
					return reject(error);
				}
			});
		});
	}

	Schedule.scheduleJob(name, cron, invoke);

	return {
		name,
		createAt: Date.now(),
		invoke,
		on: eventEmitter.on.bind(eventEmitter),
		emit
	};
}

module.exports = {
	create
};