alvarocastro/backoff

const Backoff = function (options = {}) {
    this.min = options.min || 1000;
    this.max = options.max || 60000;
    this.factor = options.factor || 2;
    this.jitter = options.jitter || 0;
    this.attempts = 0;
};

Backoff.prototype.duration = function () {
    let time = this.min * (this.factor ** this.attempts);

    this.attempts++;
    if (this.jitter) {
        const deviation = Math.round(Math.random() * this.jitter * this.min * 2);
        time += (this.jitter * this.min) - deviation;
    }

    return Math.floor(Math.min(time, this.max));
};

Backoff.prototype.reset = function () {
    this.attempts = 0;
};

module.exports = Backoff;