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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
// @ts-check
/// <reference path="../../core/internal.d.ts" />
import * as webidl from "ext:deno_webidl/00_webidl.js";
import {
defineEventHandler,
Event,
EventTarget,
listenerCount,
setIsTrusted,
} from "ext:deno_web/02_event.js";
const primordials = globalThis.__bootstrap.primordials;
const {
SafeArrayIterator,
SafeSet,
SafeSetIterator,
SetPrototypeAdd,
SetPrototypeDelete,
Symbol,
TypeError,
} = primordials;
import { refTimer, setTimeout, unrefTimer } from "ext:deno_web/02_timers.js";
const add = Symbol("[[add]]");
const signalAbort = Symbol("[[signalAbort]]");
const remove = Symbol("[[remove]]");
const abortReason = Symbol("[[abortReason]]");
const abortAlgos = Symbol("[[abortAlgos]]");
const signal = Symbol("[[signal]]");
const timerId = Symbol("[[timerId]]");
const illegalConstructorKey = Symbol("illegalConstructorKey");
class AbortSignal extends EventTarget {
static abort(reason = undefined) {
if (reason !== undefined) {
reason = webidl.converters.any(reason);
}
const signal = new AbortSignal(illegalConstructorKey);
signal[signalAbort](reason);
return signal;
}
static timeout(millis) {
const prefix = "Failed to call 'AbortSignal.timeout'";
webidl.requiredArguments(arguments.length, 1, prefix);
millis = webidl.converters["unsigned long long"](
millis,
prefix,
"Argument 1",
{
enforceRange: true,
},
);
const signal = new AbortSignal(illegalConstructorKey);
signal[timerId] = setTimeout(
() => {
signal[timerId] = null;
signal[signalAbort](
new DOMException("Signal timed out.", "TimeoutError"),
);
},
millis,
);
unrefTimer(signal[timerId]);
return signal;
}
[add](algorithm) {
if (this.aborted) {
return;
}
if (this[abortAlgos] === null) {
this[abortAlgos] = new SafeSet();
}
SetPrototypeAdd(this[abortAlgos], algorithm);
}
[signalAbort](
reason = new DOMException("The signal has been aborted", "AbortError"),
) {
if (this.aborted) {
return;
}
this[abortReason] = reason;
const algos = this[abortAlgos];
this[abortAlgos] = null;
const event = new Event("abort");
setIsTrusted(event, true);
this.dispatchEvent(event);
if (algos !== null) {
for (const algorithm of new SafeSetIterator(algos)) {
algorithm();
}
}
}
[remove](algorithm) {
this[abortAlgos] && SetPrototypeDelete(this[abortAlgos], algorithm);
}
constructor(key = null) {
if (key != illegalConstructorKey) {
throw new TypeError("Illegal constructor.");
}
super();
this[abortReason] = undefined;
this[abortAlgos] = null;
this[timerId] = null;
this[webidl.brand] = webidl.brand;
}
get aborted() {
webidl.assertBranded(this, AbortSignalPrototype);
return this[abortReason] !== undefined;
}
get reason() {
webidl.assertBranded(this, AbortSignalPrototype);
return this[abortReason];
}
throwIfAborted() {
webidl.assertBranded(this, AbortSignalPrototype);
if (this[abortReason] !== undefined) {
throw this[abortReason];
}
}
// `addEventListener` and `removeEventListener` have to be overridden in
// order to have the timer block the event loop while there are listeners.
// `[add]` and `[remove]` don't ref and unref the timer because they can
// only be used by Deno internals, which use it to essentially cancel async
// ops which would block the event loop.
addEventListener(...args) {
super.addEventListener(...new SafeArrayIterator(args));
if (this[timerId] !== null && listenerCount(this, "abort") > 0) {
refTimer(this[timerId]);
}
}
removeEventListener(...args) {
super.removeEventListener(...new SafeArrayIterator(args));
if (this[timerId] !== null && listenerCount(this, "abort") === 0) {
unrefTimer(this[timerId]);
}
}
}
defineEventHandler(AbortSignal.prototype, "abort");
webidl.configurePrototype(AbortSignal);
const AbortSignalPrototype = AbortSignal.prototype;
class AbortController {
[signal] = new AbortSignal(illegalConstructorKey);
constructor() {
this[webidl.brand] = webidl.brand;
}
get signal() {
webidl.assertBranded(this, AbortControllerPrototype);
return this[signal];
}
abort(reason) {
webidl.assertBranded(this, AbortControllerPrototype);
this[signal][signalAbort](reason);
}
}
webidl.configurePrototype(AbortController);
const AbortControllerPrototype = AbortController.prototype;
webidl.converters["AbortSignal"] = webidl.createInterfaceConverter(
"AbortSignal",
AbortSignal.prototype,
);
function newSignal() {
return new AbortSignal(illegalConstructorKey);
}
function follow(followingSignal, parentSignal) {
if (followingSignal.aborted) {
return;
}
if (parentSignal.aborted) {
followingSignal[signalAbort](parentSignal.reason);
} else {
parentSignal[add](() => followingSignal[signalAbort](parentSignal.reason));
}
}
export {
AbortController,
AbortSignal,
AbortSignalPrototype,
add,
follow,
newSignal,
remove,
signalAbort,
timerId,
};
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