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Original file line number | Diff line number | Diff line change |
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/*! @license | ||
* Shaka Player | ||
* Copyright 2016 Google LLC | ||
* SPDX-License-Identifier: Apache-2.0 | ||
*/ | ||
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goog.provide('shaka.polyfill.AbortController'); | ||
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goog.require('shaka.polyfill'); | ||
goog.require('shaka.util.FakeEvent'); | ||
goog.require('shaka.util.FakeEventTarget'); | ||
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/** | ||
* @summary A polyfill for systems that do not implement AbortController. | ||
* This is used both with the fetch API for HTTP requests and inside the HLS | ||
* parser. | ||
* @export | ||
* @extends AbortController | ||
*/ | ||
shaka.polyfill.AbortController = class { | ||
/** | ||
* Install the polyfill if needed. | ||
* @export | ||
*/ | ||
static install() { | ||
if (window.AbortController) { | ||
// Not needed. | ||
return; | ||
} | ||
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window.AbortController = shaka.polyfill.AbortController; | ||
window.AbortSignal = shaka.polyfill.AbortController.AbortSignal; | ||
} | ||
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/** */ | ||
constructor() { | ||
/** @private {!shaka.polyfill.AbortController.AbortSignal} */ | ||
this.signal_ = new shaka.polyfill.AbortController.AbortSignal(); | ||
} | ||
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/** | ||
* @override | ||
* @suppress {const|duplicate} Since the original is defined as "const", we | ||
* need this suppression to override it. | ||
*/ | ||
get signal() { | ||
return this.signal_; | ||
} | ||
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/** | ||
* @param {*=} reason | ||
* @override | ||
*/ | ||
abort(reason) { | ||
this.signal_.doAbort_(reason); | ||
} | ||
}; | ||
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/** | ||
* @summary A polyfill for AbortSignal, part of the AbortController API. | ||
* @implements {AbortSignal} | ||
*/ | ||
shaka.polyfill.AbortController.AbortSignal = | ||
class extends shaka.util.FakeEventTarget { | ||
/** */ | ||
constructor() { | ||
super(); | ||
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/** @private {boolean} */ | ||
this.aborted_ = false; | ||
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/** @private {*} */ | ||
this.reason_ = undefined; | ||
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/** @type {?function(!Event)} */ | ||
this.onabort = null; | ||
} | ||
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/** @override */ | ||
get aborted() { | ||
return this.aborted_; | ||
} | ||
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/** @return {*} */ | ||
get reason() { | ||
return this.reason_; | ||
} | ||
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/** | ||
* @param {*} reason | ||
* @private | ||
*/ | ||
doAbort_(reason) { | ||
if (this.aborted_) { | ||
return; | ||
} | ||
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this.aborted_ = true; | ||
this.reason_ = reason; | ||
if (this.reason_ === undefined) { | ||
// This is equivalent to a native implementation. | ||
this.reason_ = new DOMException( | ||
'signal is aborted without reason', 'AbortError'); | ||
} | ||
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// According to MDN: | ||
// "Event type - A generic Event with no added properties." | ||
const event = new shaka.util.FakeEvent('abort'); | ||
if (this.onabort) { | ||
this.onabort(event); | ||
} | ||
this.dispatchEvent(event); | ||
} | ||
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/** | ||
* @param {*=} reason | ||
* @return {!AbortSignal} | ||
*/ | ||
static abort(reason) { | ||
const signal = new shaka.polyfill.AbortController.AbortSignal(); | ||
signal.doAbort_(reason); | ||
return signal; | ||
} | ||
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/** | ||
* @param {number} timeMs | ||
* @return {!AbortSignal} | ||
*/ | ||
static timeout(timeMs) { | ||
const signal = new shaka.polyfill.AbortController.AbortSignal(); | ||
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window.setTimeout(() => { | ||
// This is equivalent to a native implementation. | ||
signal.doAbort_(new DOMException('signal timed out', 'TimeoutError')); | ||
}, timeMs); | ||
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return signal; | ||
} | ||
}; | ||
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shaka.polyfill.register(shaka.polyfill.AbortController.install); |
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