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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_TEE_ENGINE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_TEE_ENGINE_H_
#include <array>
#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
#include "third_party/blink/renderer/bindings/core/v8/to_v8_traits.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/heap/member.h"
#include "third_party/blink/renderer/platform/heap/visitor.h"
#include "v8/include/v8.h"
namespace blink {
class ExceptionState;
class ReadableStream;
class ReadableStreamDefaultController;
class ReadableStreamDefaultReader;
class ScriptState;
// Implementation of "ReadableStreamDefaultTee()" from the standard.
// https://streams.spec.whatwg.org/#abstract-opdef-readablestreamdefaulttee
class TeeEngine final : public GarbageCollected<TeeEngine> {
public:
TeeEngine() = default;
TeeEngine(const TeeEngine&) = delete;
TeeEngine& operator=(const TeeEngine&) = delete;
// Create the streams and start copying data.
void Start(ScriptState*,
ReadableStream*,
bool clone_for_branch2,
ExceptionState&);
// Branch1() and Branch2() are null until Start() is called.
ReadableStream* Branch1() const { return branch_[0].Get(); }
ReadableStream* Branch2() const { return branch_[1].Get(); }
void Trace(Visitor* visitor) const {
visitor->Trace(stream_);
visitor->Trace(reader_);
visitor->Trace(reason_[0]);
visitor->Trace(reason_[1]);
visitor->Trace(branch_[0]);
visitor->Trace(branch_[1]);
visitor->Trace(controller_[0]);
visitor->Trace(controller_[1]);
visitor->Trace(cancel_promise_);
}
private:
class PullAlgorithm;
class CancelAlgorithm;
// https://streams.spec.whatwg.org/#abstract-opdef-structuredclone
v8::MaybeLocal<v8::Value> StructuredClone(ScriptState*,
v8::Local<v8::Value> chunk,
ExceptionState&);
Member<ReadableStream> stream_;
Member<ReadableStreamDefaultReader> reader_;
Member<ScriptPromiseResolver<IDLUndefined>> cancel_promise_;
bool reading_ = false;
bool read_again_ = false;
bool clone_for_branch2_ = false;
// The standard contains a number of pairs of variables with one for each
// stream. These are implemented as arrays here. While they are 1-indexed in
// the standard, they are 0-indexed here; ie. "canceled_[0]" here corresponds
// to "canceled1" in the standard.
std::array<bool, 2> canceled_ = {false, false};
std::array<TraceWrapperV8Reference<v8::Value>, 2> reason_;
std::array<Member<ReadableStream>, 2> branch_;
std::array<Member<ReadableStreamDefaultController>, 2> controller_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_TEE_ENGINE_H_
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