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LibWeb: Add the ability for an AbortSignal to follow another

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Following another abort signal basically means to make an abort signal
abort when another abort signal is aborted, unless the following signal
is already aborted.
This commit is contained in:
Luke Wilde 2022-10-26 18:15:46 +01:00 committed by Linus Groh
parent 07e3bb729d
commit dce6327ae7
Notes: sideshowbarker 2024-07-17 09:39:38 +09:00 
Author: https://github.com/Lubrsi
Commit: https://github.com/SerenityOS/serenity/commit/dce6327ae7
Pull-request: https://github.com/SerenityOS/serenity/pull/15815
2 changed files with 25 additions and 0 deletions
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23
Userland/Libraries/LibWeb/DOM/AbortSignal.cpp
View file

@ -84,4 +84,27 @@ void AbortSignal::visit_edges(JS::Cell::Visitor& visitor)
visitor.visit(m_abort_reason);
}
// https://dom.spec.whatwg.org/#abortsignal-follow
void AbortSignal::follow(JS::NonnullGCPtr<AbortSignal> parent_signal)
{
// A followingSignal (an AbortSignal) is made to follow a parentSignal (an AbortSignal) by running these steps:
// 1. If followingSignal is aborted, then return.
if (aborted())
return;
// 2. If parentSignal is aborted, then signal abort on followingSignal with parentSignal’s abort reason.
if (parent_signal->aborted()) {
signal_abort(parent_signal->reason());
return;
}
// 3. Otherwise, add the following abort steps to parentSignal:
// NOTE: `this` and `parent_signal` are protected by AbortSignal using JS::SafeFunction.
parent_signal->add_abort_algorithm([this, parent_signal]() mutable {
// 1. Signal abort on followingSignal with parentSignal’s abort reason.
signal_abort(parent_signal->reason());
});
}
}

2
Userland/Libraries/LibWeb/DOM/AbortSignal.h
View file

@ -38,6 +38,8 @@ public:
JS::ThrowCompletionOr<void> throw_if_aborted() const;
void follow(JS::NonnullGCPtr<AbortSignal> parent_signal);
private:
explicit AbortSignal(JS::Realm&);