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