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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "TeeState.h"
#include "ReadableStreamTee.h"
#include "js/Value.h"
#include "mozilla/HoldDropJSObjects.h"
#include "mozilla/dom/ReadableStream.h"
#include "mozilla/dom/Promise.h"
namespace mozilla::dom {
using namespace streams_abstract;
NS_IMPL_CYCLE_COLLECTION_WITH_JS_MEMBERS(TeeState,
(mStream, mReader, mBranch1, mBranch2,
mCancelPromise),
(mReason1, mReason2))
NS_IMPL_CYCLE_COLLECTING_ADDREF(TeeState)
NS_IMPL_CYCLE_COLLECTING_RELEASE(TeeState)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TeeState)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
TeeState::TeeState(ReadableStream* aStream, bool aCloneForBranch2)
: mStream(aStream),
mReason1(JS::NullValue()),
mReason2(JS::NullValue()),
mCloneForBranch2(aCloneForBranch2) {
mozilla::HoldJSObjects(this);
MOZ_RELEASE_ASSERT(!aCloneForBranch2,
"cloneForBranch2 path is not implemented.");
}
already_AddRefed<TeeState> TeeState::Create(ReadableStream* aStream,
bool aCloneForBranch2,
ErrorResult& aRv) {
RefPtr<TeeState> teeState = new TeeState(aStream, aCloneForBranch2);
RefPtr<ReadableStreamDefaultReader> reader =
AcquireReadableStreamDefaultReader(teeState->GetStream(), aRv);
if (aRv.Failed()) {
return nullptr;
}
teeState->SetReader(reader);
RefPtr<Promise> promise =
Promise::CreateInfallible(teeState->GetStream()->GetParentObject());
teeState->SetCancelPromise(promise);
return teeState.forget();
}
// https://streams.spec.whatwg.org/#abstract-opdef-readablestreamdefaulttee
// Pull Algorithm Steps:
void TeeState::PullCallback(JSContext* aCx, nsIGlobalObject* aGlobal,
ErrorResult& aRv) {
// Step 13.1: If reading is true,
if (Reading()) {
// Step 13.1.1: Set readAgain to true.
SetReadAgain(true);
// Step 13.1.2: Return a promise resolved with undefined.
// (The caller will create it if necessary)
return;
}
// Step 13.2: Set reading to true.
SetReading(true);
// Step 13.3: Let readRequest be a read request with the following items:
RefPtr<ReadRequest> readRequest =
new ReadableStreamDefaultTeeReadRequest(this);
// Step 13.4: Perform ! ReadableStreamDefaultReaderRead(reader, readRequest).
RefPtr<ReadableStreamGenericReader> reader = GetReader();
ReadableStreamDefaultReaderRead(aCx, reader, readRequest, aRv);
// Step 13.5: Return a promise resolved with undefined.
// (The caller will create it if necessary)
}
} // namespace mozilla::dom
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