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64abc6101d
Our structured serialization implementation had its own bespoke encoder and decoder to serialize JS values. It also used a u32 buffer under the hood, which made using its structures a bit awkward. We had previously worked around its data structures in transferable streams, which nested transfers of MessagePort instances. We basically had to add hooks into the MessagePort to route to the correct transfer receiving steps, and we could not invoke the correct AOs directly as the spec dictates. We now use IPC mechanics to encode and decode data. This works because, although we are encoding JS values, we are only ultimately encoding primitive and basic AK types. The resulting data structures actually enforce that we implement transferable streams exactly as the spec is worded (I had planned to do that in a separate commit, but the fallout of this patch actually required that change).
83 lines
3.4 KiB
C++
83 lines
3.4 KiB
C++
/*
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* Copyright (c) 2023, Kenneth Myhra <kennethmyhra@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibJS/Forward.h>
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#include <LibWeb/Bindings/PlatformObject.h>
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#include <LibWeb/Bindings/Transferable.h>
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#include <LibWeb/Forward.h>
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#include <LibWeb/Streams/Algorithms.h>
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#include <LibWeb/Streams/QueuingStrategy.h>
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#include <LibWeb/WebIDL/Promise.h>
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namespace Web::Streams {
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class TransformStream final
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: public Bindings::PlatformObject
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, public Bindings::Transferable {
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WEB_PLATFORM_OBJECT(TransformStream, Bindings::PlatformObject);
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GC_DECLARE_ALLOCATOR(TransformStream);
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public:
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virtual ~TransformStream() override;
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static WebIDL::ExceptionOr<GC::Ref<TransformStream>> construct_impl(JS::Realm&, Optional<GC::Root<JS::Object>> transformer_object = {}, QueuingStrategy const& writable_strategy = {}, QueuingStrategy const& readable_strategy = {});
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// https://streams.spec.whatwg.org/#ts-readable
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GC::Ref<ReadableStream> readable() { return *m_readable; }
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void set_readable(ReadableStream& readable) { m_readable = readable; }
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// https://streams.spec.whatwg.org/#ts-writable
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GC::Ref<WritableStream> writable() { return *m_writable; }
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void set_writable(WritableStream& writable) { m_writable = writable; }
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Optional<bool> backpressure() const { return m_backpressure; }
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void set_backpressure(Optional<bool> value) { m_backpressure = move(value); }
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GC::Ptr<WebIDL::Promise> backpressure_change_promise() const { return m_backpressure_change_promise; }
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void set_backpressure_change_promise(GC::Ptr<WebIDL::Promise> value) { m_backpressure_change_promise = value; }
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GC::Ptr<TransformStreamDefaultController> controller() const { return m_controller; }
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void set_controller(GC::Ptr<TransformStreamDefaultController> value) { m_controller = value; }
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void set_up(GC::Ref<TransformAlgorithm>, GC::Ptr<FlushAlgorithm> = {}, GC::Ptr<CancelAlgorithm> = {});
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void enqueue(JS::Value chunk);
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// ^Transferable
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virtual WebIDL::ExceptionOr<void> transfer_steps(HTML::TransferDataEncoder&) override;
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virtual WebIDL::ExceptionOr<void> transfer_receiving_steps(HTML::TransferDataDecoder&) override;
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virtual HTML::TransferType primary_interface() const override { return HTML::TransferType::TransformStream; }
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private:
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explicit TransformStream(JS::Realm& realm);
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virtual void initialize(JS::Realm&) override;
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virtual void visit_edges(Cell::Visitor&) override;
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// https://streams.spec.whatwg.org/#transformstream-backpressure
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// Whether there was backpressure on [[readable]] the last time it was observed
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Optional<bool> m_backpressure { false };
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// https://streams.spec.whatwg.org/#transformstream-backpressurechangepromise
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// A promise which is fulfilled and replaced every time the value of [[backpressure]] changes
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GC::Ptr<WebIDL::Promise> m_backpressure_change_promise;
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// https://streams.spec.whatwg.org/#transformstream-controller
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// A TransformStreamDefaultController created with the ability to control [[readable]] and [[writable]]
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GC::Ptr<TransformStreamDefaultController> m_controller;
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// https://streams.spec.whatwg.org/#transformstream-readable
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// The ReadableStream instance controlled by this object
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GC::Ptr<ReadableStream> m_readable;
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// https://streams.spec.whatwg.org/#transformstream-writable
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// The WritableStream instance controlled by this object
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GC::Ptr<WritableStream> m_writable;
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};
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}
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