mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-08 10:44:56 +00:00
d8983d750a
Differential Revision: https://phabricator.services.mozilla.com/D167782
88 lines
3.0 KiB
C++
88 lines
3.0 KiB
C++
/* -*- 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
|