93 lines
1.8 KiB
JavaScript
93 lines
1.8 KiB
JavaScript
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'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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// copied from discord_app/lib because including from there is broken.
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class Backoff {
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/**
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* Create a backoff instance can automatically backoff retries.
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*/
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constructor(min = 500, max = null, jitter = true) {
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this.min = min;
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this.max = max != null ? max : min * 10;
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this.jitter = jitter;
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this._current = min;
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this._timeoutId = null;
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this._fails = 0;
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}
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/**
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* Return the number of failures.
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*/
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get fails() {
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return this._fails;
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}
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/**
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* Current backoff value in milliseconds.
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*/
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get current() {
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return this._current;
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}
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/**
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* A callback is going to fire.
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*/
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get pending() {
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return this._timeoutId != null;
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}
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/**
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* Clear any pending callbacks and reset the backoff.
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*/
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succeed() {
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this.cancel();
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this._fails = 0;
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this._current = this.min;
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}
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/**
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* Increment the backoff and schedule a callback if provided.
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*/
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fail(callback) {
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this._fails += 1;
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let delay = this._current * 2;
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if (this.jitter) {
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delay *= Math.random();
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}
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this._current = Math.min(this._current + delay, this.max);
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if (callback != null) {
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if (this._timeoutId != null) {
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throw new Error('callback already pending');
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}
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this._timeoutId = setTimeout(() => {
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try {
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if (callback != null) {
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callback();
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}
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} finally {
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this._timeoutId = null;
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}
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}, this._current);
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}
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return this._current;
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}
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/**
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* Clear any pending callbacks.
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*/
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cancel() {
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if (this._timeoutId != null) {
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clearTimeout(this._timeoutId);
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this._timeoutId = null;
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}
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}
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}
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exports.default = Backoff;
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module.exports = exports['default'];
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