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LibWeb: Propagate OOM in Body::fully_read() through its error callback

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Fetched bodies can be on the order of gigabytes, so rather than crashing
when we hit OOM here, we can simply invoke the error callback with a DOM
exception. We use "UnknownError" here as the spec directly supports this
for OOM errors:

    UnknownError: The operation failed for an unknown transient reason
                  (e.g. out of memory).

This is still an ad-hoc implementation. We should be using streams, and
we do have the AOs available to do so. But they need to be massaged to
be compatible with callers of Body::fully_read. And once we do use
streams, this function will become infallible - so making it infallible
here is at least a step in the right direction.
This commit is contained in:
Timothy Flynn 2024-04-26 14:57:40 -04:00 • committed by Andreas Kling
commit 1ffda6a805
Notes: sideshowbarker 2024-07-16 18:03:21 +09:00
10 changed files with 39 additions and 42 deletions
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2
Userland/Libraries/LibWeb/Fetch/Body.cpp
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@ -201,7 +201,7 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::Promise>> consume_body(JS::Realm& realm
}
// 6. Otherwise, fully read object’s body given successSteps, errorSteps, and object’s relevant global object.
else {
TRY(body->fully_read(realm, success_steps, error_steps, JS::NonnullGCPtr { HTML::relevant_global_object(object.as_platform_object()) }));
body->fully_read(realm, success_steps, error_steps, JS::NonnullGCPtr { HTML::relevant_global_object(object.as_platform_object()) });
}
// 7. Return promise.