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VIDEO-9282 - Migrate SDK from using node.js util. (#1752)
* VIDEO-9282 - Removing all references to node dependencies. Co-authored-by: Makarand Patwardhan <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
|
|
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| /** | ||
| * Expose `Backoff`. | ||
| */ | ||
|
|
||
| class Backoff { | ||
| /** | ||
| * Construct a {@link Backoff}. | ||
| * @param {object} options | ||
| * @property {number} min - Initial timeout in milliseconds [100] | ||
| * @property {number} max - Max timeout [10000] | ||
| * @property {boolean} jitter - Apply jitter [0] | ||
| * @property {number} factor - Multiplication factor for Backoff operation [2] | ||
| */ | ||
| constructor(options) { | ||
| Object.defineProperties(this, { | ||
| _min: { | ||
| value: options.min || 100 | ||
| }, | ||
| _max: { | ||
| value: options.max || 10000 | ||
| }, | ||
| _jitter: { | ||
| value: options.jitter > 0 && options.jitter <= 1 ? options.jitter : 0 | ||
| }, | ||
| _factor: { | ||
| value: options.factor || 2 | ||
| }, | ||
| _attempts: { | ||
| value: 0, | ||
| writable: true | ||
| }, | ||
| _duration: { | ||
| enumerable: false, | ||
| get() { | ||
| let ms = this._min * Math.pow(this._factor, this._attempts); | ||
| if (this._jitter) { | ||
| const rand = Math.random(); | ||
| const deviation = Math.floor(rand * this._jitter * ms); | ||
| ms = (Math.floor(rand * 10) & 1) === 0 ? ms - deviation : ms + deviation; | ||
| } | ||
| return Math.min(ms, this._max) | 0; | ||
| } | ||
| }, | ||
| _timeoutID: { | ||
| value: null, | ||
| writable: true | ||
| } | ||
| }); | ||
| } | ||
|
|
||
| /** | ||
| * Start the backoff operation. | ||
| * @param {function} fn - Function to call | ||
| * @return {void} | ||
| * @api public | ||
| */ | ||
| backoff(fn) { | ||
| let duration = this._duration; | ||
| if (this._timeoutID) { | ||
| clearTimeout(this._timeoutID); | ||
| this._timeoutID = null; | ||
| } | ||
| this._timeoutID = setTimeout(() => { | ||
| this._attempts++; | ||
| fn(); | ||
| }, duration); | ||
| } | ||
|
|
||
| /** | ||
| * Reset the number of attempts and clear the timer. | ||
| * | ||
| * @return {void} | ||
| * @api public | ||
| */ | ||
| reset() { | ||
| this._attempts = 0; | ||
| if (this._timeoutID) { | ||
| clearTimeout(this._timeoutID); | ||
| this._timeoutID = null; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| module.exports = Backoff; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| /** | ||
| * Copyright (c) 2011-2022 Isaac Z. Schlueter | ||
| * Licensed under the ISC License. | ||
| * | ||
| * Copied from https://github.com/isaacs/inherits (2.0.4) | ||
| */ | ||
|
|
||
| module.exports = function inherits(ctor, superCtor) { | ||
| if (ctor && superCtor) { | ||
| ctor.super_ = superCtor; | ||
| if (typeof Object.create === 'function') { | ||
| // implementation from standard node.js 'util' module | ||
| ctor.prototype = Object.create(superCtor.prototype, { | ||
| constructor: { | ||
| value: ctor, | ||
| enumerable: false, | ||
| writable: true, | ||
| configurable: true | ||
| } | ||
| }); | ||
| } else { | ||
| // old school shim for old browsers | ||
| class TempCtor { | ||
| constructor() { } | ||
| } | ||
| TempCtor.prototype = superCtor.prototype; | ||
| ctor.prototype = new TempCtor(); | ||
| ctor.prototype.constructor = ctor; | ||
| } | ||
| } | ||
| }; |
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