asarfuckery/appasar/stable/common/Backoff.js
2019-01-17 19:22:05 +01:00

127 lines
No EOL
3.2 KiB
JavaScript

'use strict';
Object.defineProperty(exports, "__esModule", {
value: true
});
var _createClass = function () { 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); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
// copied from discord_app/lib because including from there is broken.
var Backoff = function () {
/**
* Create a backoff instance can automatically backoff retries.
*/
function Backoff() {
var min = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 500;
var max = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : null;
var jitter = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : true;
_classCallCheck(this, Backoff);
this.min = min;
this.max = max != null ? max : min * 10;
this.jitter = jitter;
this._current = min;
this._timeoutId = null;
this._fails = 0;
}
/**
* Return the number of failures.
*/
_createClass(Backoff, [{
key: 'succeed',
/**
* Clear any pending callbacks and reset the backoff.
*/
value: function succeed() {
this.cancel();
this._fails = 0;
this._current = this.min;
}
/**
* Increment the backoff and schedule a callback if provided.
*/
}, {
key: 'fail',
value: function fail(callback) {
var _this = this;
this._fails += 1;
var delay = this._current * 2;
if (this.jitter) {
delay *= Math.random();
}
this._current = Math.min(this._current + delay, this.max);
if (callback != null) {
if (this._timeoutId != null) {
throw new Error('callback already pending');
}
this._timeoutId = setTimeout(function () {
try {
if (callback != null) {
callback();
}
} finally {
_this._timeoutId = null;
}
}, this._current);
}
return this._current;
}
/**
* Clear any pending callbacks.
*/
}, {
key: 'cancel',
value: function cancel() {
if (this._timeoutId != null) {
clearTimeout(this._timeoutId);
this._timeoutId = null;
}
}
}, {
key: 'fails',
get: function get() {
return this._fails;
}
/**
* Current backoff value in milliseconds.
*/
}, {
key: 'current',
get: function get() {
return this._current;
}
/**
* A callback is going to fire.
*/
}, {
key: 'pending',
get: function get() {
return this._timeoutId != null;
}
}]);
return Backoff;
}();
exports.default = Backoff;
module.exports = exports['default'];