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183 lines
8.5 KiB
C++
183 lines
8.5 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/Optional.h>
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#include <AK/SinglyLinkedList.h>
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#include <LibWeb/Bindings/PlatformObject.h>
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#include <LibWeb/Streams/AbstractOperations.h>
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namespace Web::Streams {
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enum class ReaderType {
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Default,
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Byob,
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None,
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};
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// https://streams.spec.whatwg.org/#pull-into-descriptor
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struct PullIntoDescriptor {
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// https://streams.spec.whatwg.org/#pull-into-descriptor-buffer
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// An ArrayBuffer
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JS::NonnullGCPtr<JS::ArrayBuffer> buffer;
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// https://streams.spec.whatwg.org/#pull-into-descriptor-buffer-byte-length
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// A positive integer representing the initial byte length of buffer
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u32 buffer_byte_length;
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// https://streams.spec.whatwg.org/#pull-into-descriptor-byte-offset
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// A nonnegative integer byte offset into the buffer where the underlying byte source will start writing
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u32 byte_offset;
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// https://streams.spec.whatwg.org/#pull-into-descriptor-byte-length
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// A positive integer number of bytes which can be written into the buffer
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u32 byte_length;
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// https://streams.spec.whatwg.org/#pull-into-descriptor-bytes-filled
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// A nonnegative integer number of bytes that have been written into the buffer so far
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u32 bytes_filled;
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// https://streams.spec.whatwg.org/#pull-into-descriptor-element-size
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// A positive integer representing the number of bytes that can be written into the buffer at a time, using views of the type described by the view constructor
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u32 element_size;
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// https://streams.spec.whatwg.org/#pull-into-descriptor-view-constructor
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// A typed array constructor or %DataView%, which will be used for constructing a view with which to write into the buffer
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JS::NonnullGCPtr<JS::NativeFunction> view_constructor;
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// https://streams.spec.whatwg.org/#pull-into-descriptor-reader-type
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// Either "default" or "byob", indicating what type of readable stream reader initiated this request, or "none" if the initiating reader was released
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ReaderType reader_type;
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};
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// https://streams.spec.whatwg.org/#readable-byte-stream-queue-entry
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struct ReadableByteStreamQueueEntry {
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// https://streams.spec.whatwg.org/#readable-byte-stream-queue-entry-buffer
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// An ArrayBuffer, which will be a transferred version of the one originally supplied by the underlying byte source
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JS::NonnullGCPtr<JS::ArrayBuffer> buffer;
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// https://streams.spec.whatwg.org/#readable-byte-stream-queue-entry-byte-offset
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// A nonnegative integer number giving the byte offset derived from the view originally supplied by the underlying byte source
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u32 byte_offset;
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// https://streams.spec.whatwg.org/#readable-byte-stream-queue-entry-byte-length
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// A nonnegative integer number giving the byte length derived from the view originally supplied by the underlying byte source
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u32 byte_length;
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};
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// https://streams.spec.whatwg.org/#readablebytestreamcontroller
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class ReadableByteStreamController : public Bindings::PlatformObject {
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WEB_PLATFORM_OBJECT(ReadableByteStreamController, Bindings::PlatformObject);
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public:
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virtual ~ReadableByteStreamController() override = default;
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JS::GCPtr<ReadableStreamBYOBRequest> byob_request() { return m_byob_request; }
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void set_byob_request(JS::GCPtr<ReadableStreamBYOBRequest> request) { m_byob_request = request; }
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Optional<double> desired_size() const;
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WebIDL::ExceptionOr<void> close();
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Optional<u32> const& auto_allocate_chunk_size() { return m_auto_allocate_chunk_size; }
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void set_auto_allocate_chunk_size(Optional<u32> value) { m_auto_allocate_chunk_size = value; }
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auto& cancel_algorithm() { return m_cancel_algorithm; }
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void set_cancel_algorithm(Optional<CancelAlgorithm> value) { m_cancel_algorithm = move(value); }
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bool close_requested() const { return m_close_requested; }
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void set_close_requested(bool value) { m_close_requested = value; }
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bool pull_again() const { return m_pull_again; }
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void set_pull_again(bool value) { m_pull_again = value; }
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auto& pull_algorithm() { return m_pull_algorithm; }
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void set_pull_algorithm(Optional<PullAlgorithm> value) { m_pull_algorithm = move(value); }
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bool pulling() const { return m_pulling; }
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void set_pulling(bool value) { m_pulling = value; }
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SinglyLinkedList<PullIntoDescriptor>& pending_pull_intos() { return m_pending_pull_intos; }
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SinglyLinkedList<ReadableByteStreamQueueEntry>& queue() { return m_queue; }
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u32 queue_total_size() const { return m_queue_total_size; }
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void set_queue_total_size(u32 size) { m_queue_total_size = size; }
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bool started() const { return m_started; }
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void set_started(bool value) { m_started = value; }
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u32 strategy_hwm() const { return m_strategy_hwm; }
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void set_strategy_hwm(u32 value) { m_strategy_hwm = value; }
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JS::GCPtr<ReadableStream const> stream() const { return m_stream; }
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JS::GCPtr<ReadableStream> stream() { return m_stream; }
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void set_stream(JS::GCPtr<ReadableStream> stream) { m_stream = stream; }
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WebIDL::ExceptionOr<JS::NonnullGCPtr<WebIDL::Promise>> cancel_steps(JS::Value reason);
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WebIDL::ExceptionOr<void> pull_steps(NonnullRefPtr<ReadRequest>);
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WebIDL::ExceptionOr<void> release_steps();
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private:
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explicit ReadableByteStreamController(JS::Realm&);
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virtual void visit_edges(Cell::Visitor&) override;
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// https://streams.spec.whatwg.org/#readablebytestreamcontroller-autoallocatechunksize
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// A positive integer, when the automatic buffer allocation feature is enabled. In that case, this value specifies the size of buffer to allocate. It is undefined otherwise.
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Optional<u32> m_auto_allocate_chunk_size;
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// https://streams.spec.whatwg.org/#readablebytestreamcontroller-byobrequest
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// A ReadableStreamBYOBRequest instance representing the current BYOB pull request, or null if there are no pending requests
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JS::GCPtr<ReadableStreamBYOBRequest> m_byob_request;
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// https://streams.spec.whatwg.org/#readablestreamdefaultcontroller-cancelalgorithm
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// A promise-returning algorithm, taking one argument (the cancel reason), which communicates a requested cancelation to the underlying source
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Optional<CancelAlgorithm> m_cancel_algorithm;
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// https://streams.spec.whatwg.org/#readablestreamdefaultcontroller-closerequested
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// A boolean flag indicating whether the stream has been closed by its underlying source, but still has chunks in its internal queue that have not yet been read
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bool m_close_requested { false };
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// https://streams.spec.whatwg.org/#readablestreamdefaultcontroller-pullagain
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// A boolean flag set to true if the stream’s mechanisms requested a call to the underlying source's pull algorithm to pull more data, but the pull could not yet be done since a previous call is still executing
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bool m_pull_again { false };
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// https://streams.spec.whatwg.org/#readablestreamdefaultcontroller-pullalgorithm
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// A promise-returning algorithm that pulls data from the underlying source
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Optional<PullAlgorithm> m_pull_algorithm;
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// https://streams.spec.whatwg.org/#readablestreamdefaultcontroller-pulling
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// A boolean flag set to true while the underlying source's pull algorithm is executing and the returned promise has not yet fulfilled, used to prevent reentrant calls
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bool m_pulling { false };
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// https://streams.spec.whatwg.org/#readablebytestreamcontroller-pendingpullintos
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// A list of pull-into descriptors
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SinglyLinkedList<PullIntoDescriptor> m_pending_pull_intos;
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// https://streams.spec.whatwg.org/#readablestreamdefaultcontroller-queue
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// A list representing the stream’s internal queue of chunks
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SinglyLinkedList<ReadableByteStreamQueueEntry> m_queue;
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// https://streams.spec.whatwg.org/#readablestreamdefaultcontroller-queuetotalsize
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// The total size of all the chunks stored in [[queue]]
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u32 m_queue_total_size { 0 };
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// https://streams.spec.whatwg.org/#readablestreamdefaultcontroller-started
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// A boolean flag indicating whether the underlying source has finished starting
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bool m_started { false };
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// https://streams.spec.whatwg.org/#readablestreamdefaultcontroller-strategyhwm
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// A number supplied to the constructor as part of the stream’s queuing strategy, indicating the point at which the stream will apply backpressure to its underlying source
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u32 m_strategy_hwm { 0 };
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// https://streams.spec.whatwg.org/#readablestreamdefaultcontroller-stream
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// The ReadableStream instance controlled
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JS::GCPtr<ReadableStream> m_stream;
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};
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}
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