138 lines
3.4 KiB
JavaScript
138 lines
3.4 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports["default"] = void 0;
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
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function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
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function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
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var Backoff = /*#__PURE__*/function () {
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/**
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* Create a backoff instance can automatically backoff retries.
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*/
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function Backoff() {
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var min = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 500;
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var max = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;
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var jitter = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : true;
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_classCallCheck(this, Backoff);
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this._fails = 0;
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if (min <= 0) {
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throw Error("Backoff min value must be greater than zero or backoff will never back-off.");
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}
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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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}
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/**
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* Return the number of failures.
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*/
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_createClass(Backoff, [{
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key: "succeed",
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/**
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* Clear any pending callbacks and reset the backoff.
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*/
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value: function 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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* Incremet the backoff and schedule a callback if provided.
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*/
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}, {
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key: "fail",
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value: function fail(callback) {
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var _this = this;
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this._fails += 1;
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var 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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if (this._callback !== callback) {
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throw new Error('callback already pending');
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} else {
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// If the callback is the same, just cancel it and re-schedule.
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this.cancel();
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}
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}
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this._callback = callback;
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this._timeoutId = setTimeout(function () {
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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.cancel();
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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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}, {
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key: "cancel",
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value: function cancel() {
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this._callback = null;
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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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key: "fails",
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get: function get() {
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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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}, {
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key: "current",
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get: function get() {
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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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}, {
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key: "pending",
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get: function get() {
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return this._timeoutId != null;
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}
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}]);
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return Backoff;
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}();
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exports["default"] = Backoff;
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module.exports = exports.default;
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