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LibWeb: Update steps for transform_stream_default_sink_abort_algorithm
Updating these steps enables the writable side of a TransformStream to raise the cancel callback when it's aborted.
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Notes:
sideshowbarker
2024-07-17 02:57:43 +09:00
Author: https://github.com/kennethmyhra Commit: https://github.com/LadybirdBrowser/ladybird/commit/6d7885e250 Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/95
@ -4947,11 +4947,60 @@ JS::NonnullGCPtr<WebIDL::Promise> transform_stream_default_sink_abort_algorithm(
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{
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auto& realm = stream.realm();
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// 1. Perform ! TransformStreamError(stream, reason).
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transform_stream_error(stream, reason);
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// 1. Let controller be stream.[[controller]].
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auto controller = stream.controller();
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VERIFY(controller);
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// 2. Return a promise resolved with undefined.
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return WebIDL::create_resolved_promise(realm, JS::js_undefined());
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// 2. If controller.[[finishPromise]] is not undefined, return controller.[[finishPromise]].
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if (controller->finish_promise())
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return JS::NonnullGCPtr { *controller->finish_promise() };
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// 3. Let readable be stream.[[readable]].
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auto readable = stream.readable();
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// 4. Let controller.[[finishPromise]] be a new promise.
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controller->set_finish_promise(WebIDL::create_promise(realm));
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// 5. Let cancelPromise be the result of performing controller.[[cancelAlgorithm]], passing reason.
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auto cancel_promise = controller->cancel_algorithm()->function()(reason);
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// 6. Perform ! TransformStreamDefaultControllerClearAlgorithms(controller).
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transform_stream_default_controller_clear_algorithms(*controller);
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// 7. React to cancelPromise:
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WebIDL::react_to_promise(
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*cancel_promise,
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// 1. If cancelPromise was fulfilled, then:
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JS::create_heap_function(realm.heap(), [&realm, readable, controller](JS::Value reason) -> WebIDL::ExceptionOr<JS::Value> {
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// 1. If readable.[[state]] is "errored", reject controller.[[finishPromise]] with readable.[[storedError]].
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if (readable->state() == ReadableStream::State::Errored) {
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WebIDL::reject_promise(realm, *controller->finish_promise(), readable->stored_error());
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}
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// 2. Otherwise:
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else {
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VERIFY(readable->controller().has_value() && readable->controller()->has<JS::NonnullGCPtr<ReadableStreamDefaultController>>());
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// 1. Perform ! ReadableStreamDefaultControllerError(readable.[[controller]], reason).
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readable_stream_default_controller_error(readable->controller()->get<JS::NonnullGCPtr<ReadableStreamDefaultController>>(), reason);
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// 2. Resolve controller.[[finishPromise]] with undefined.
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WebIDL::resolve_promise(realm, *controller->finish_promise(), JS::js_undefined());
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}
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return JS::js_undefined();
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}),
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// 2. If cancelPromise was rejected with reason r, then:
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JS::create_heap_function(realm.heap(), [&realm, readable, controller](JS::Value reason) -> WebIDL::ExceptionOr<JS::Value> {
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VERIFY(readable->controller().has_value() && readable->controller()->has<JS::NonnullGCPtr<ReadableStreamDefaultController>>());
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// 1. Perform ! ReadableStreamDefaultControllerError(readable.[[controller]], r).
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readable_stream_default_controller_error(readable->controller()->get<JS::NonnullGCPtr<ReadableStreamDefaultController>>(), reason);
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// 2. Reject controller.[[finishPromise]] with r.
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WebIDL::reject_promise(realm, *controller->finish_promise(), reason);
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return JS::js_undefined();
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}));
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// 8. Return controller.[[finishPromise]].
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return JS::NonnullGCPtr { *controller->finish_promise() };
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}
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// https://streams.spec.whatwg.org/#transform-stream-default-sink-close-algorithm
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