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LibWeb: Mark most stream callbacks as infallible

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There are a number of script-provided stream callbacks for various
stream operations, such as `start`, `pull`, `cancel`, etc. Out of all of
these, only the `start` callback can actually throw. And when it does,
the exception is realized immediately in the corresponding stream
constructor.

All other callbacks have spec text of the form:

    Throwing an exception is treated the same as returning a rejected
    promise.

And indeed this is internally handled by the streams spec. Thus all of
those callbacks can be specified as returning only a promise, rather
than a WebIDL::ExceptionOr<Promise>.
This commit is contained in:
Timothy Flynn 2024-04-29 16:17:32 -04:00 • committed by Andreas Kling
commit bbe6b84bd6
Notes: sideshowbarker 2024-07-17 03:19:14 +09:00
6 changed files with 106 additions and 112 deletions
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4
Userland/Libraries/LibWeb/Streams/TransformStream.cpp
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@ -62,9 +62,9 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<TransformStream>> TransformStream::construc
TRY(set_up_transform_stream_default_controller_from_transformer(*stream, transformer, transformer_dict));
// 12. If transformerDict["start"] exists, then resolve startPromise with the result of invoking
// transformerDict["start"] with argument list « this.[[controller]] » and callback this value transformer.
// transformerDict["start"] with argument list « this.[[controller]] » and callback this value transformer.
if (transformer_dict.start) {
auto result = MUST_OR_THROW_OOM(WebIDL::invoke_callback(*transformer_dict.start, transformer, stream->controller())).release_value();
auto result = TRY(WebIDL::invoke_callback(*transformer_dict.start, transformer, stream->controller())).release_value();
WebIDL::resolve_promise(realm, start_promise, result);
}
// 13. Otherwise, resolve startPromise with undefined.