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46f9a49bd8
This algorithm is used by ReadableStreamDefaultReader to read all bytes from a given stream. Currently the algorithm used is somewhat naive as it is recursive, but given the initial use of this reader, it should not be a problem.
83 lines
2.4 KiB
C++
83 lines
2.4 KiB
C++
/*
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* Copyright (c) 2023, Matthew Olsson <mattco@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 <AK/Function.h>
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#include <AK/SinglyLinkedList.h>
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#include <LibJS/Forward.h>
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#include <LibWeb/Bindings/PlatformObject.h>
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#include <LibWeb/Forward.h>
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#include <LibWeb/Streams/ReadableStreamGenericReader.h>
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namespace Web::Streams {
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struct ReadableStreamReadResult {
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JS::Value value;
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bool done;
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};
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class ReadRequest : public RefCounted<ReadRequest> {
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public:
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virtual ~ReadRequest() = default;
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virtual void on_chunk(JS::Value chunk) = 0;
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virtual void on_close() = 0;
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virtual void on_error(JS::Value error) = 0;
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};
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class ReadLoopReadRequest : public ReadRequest {
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public:
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// successSteps, which is an algorithm accepting a byte sequence
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using SuccessSteps = JS::SafeFunction<void(ByteBuffer)>;
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// failureSteps, which is an algorithm accepting a JavaScript value
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using FailureSteps = JS::SafeFunction<void(JS::Value error)>;
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ReadLoopReadRequest(JS::VM& vm, JS::Realm& realm, ReadableStreamDefaultReader& reader, SuccessSteps success_steps, FailureSteps failure_steps);
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virtual void on_chunk(JS::Value chunk) override;
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virtual void on_close() override;
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virtual void on_error(JS::Value error) override;
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private:
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JS::VM& m_vm;
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JS::Realm& m_realm;
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ReadableStreamDefaultReader& m_reader;
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ByteBuffer m_bytes;
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SuccessSteps m_success_steps;
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FailureSteps m_failure_steps;
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};
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// https://streams.spec.whatwg.org/#readablestreamdefaultreader
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class ReadableStreamDefaultReader final
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: public Bindings::PlatformObject
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, public ReadableStreamGenericReaderMixin {
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WEB_PLATFORM_OBJECT(ReadableStreamDefaultReader, Bindings::PlatformObject);
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public:
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static WebIDL::ExceptionOr<JS::NonnullGCPtr<ReadableStreamDefaultReader>> construct_impl(JS::Realm&, JS::NonnullGCPtr<ReadableStream>);
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virtual ~ReadableStreamDefaultReader() override = default;
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WebIDL::ExceptionOr<JS::NonnullGCPtr<JS::Promise>> read();
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WebIDL::ExceptionOr<void> release_lock();
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SinglyLinkedList<NonnullRefPtr<ReadRequest>>& read_requests() { return m_read_requests; }
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private:
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explicit ReadableStreamDefaultReader(JS::Realm&);
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virtual JS::ThrowCompletionOr<void> initialize(JS::Realm&) override;
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virtual void visit_edges(Cell::Visitor&) override;
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SinglyLinkedList<NonnullRefPtr<ReadRequest>> m_read_requests;
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};
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}
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