Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 811 insertions, 0 deletions

diff --git a/dom/streams/WritableStream.cpp b/dom/streams/WritableStream.cpp
new file mode 100644
index 0000000000..8dab9a564e
--- /dev/null
+++ b/dom/streams/WritableStream.cpp
@@ -0,0 +1,811 @@
+/* -*- 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 "mozilla/dom/WritableStream.h"
+
+#include "StreamUtils.h"
+#include "js/Array.h"
+#include "js/PropertyAndElement.h"
+#include "js/TypeDecls.h"
+#include "js/Value.h"
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/CycleCollectedJSContext.h"
+#include "mozilla/HoldDropJSObjects.h"
+#include "mozilla/dom/AbortSignal.h"
+#include "mozilla/dom/BindingCallContext.h"
+#include "mozilla/dom/QueueWithSizes.h"
+#include "mozilla/dom/QueuingStrategyBinding.h"
+#include "mozilla/dom/ReadRequest.h"
+#include "mozilla/dom/RootedDictionary.h"
+#include "mozilla/dom/UnderlyingSinkBinding.h"
+#include "mozilla/dom/WritableStreamBinding.h"
+#include "mozilla/dom/WritableStreamDefaultController.h"
+#include "mozilla/dom/WritableStreamDefaultWriter.h"
+#include "nsCOMPtr.h"
+
+#include "mozilla/dom/Promise-inl.h"
+#include "nsIGlobalObject.h"
+#include "nsISupports.h"
+
+namespace mozilla::dom {
+
+using namespace streams_abstract;
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_WITH_JS_MEMBERS(
+    WritableStream,
+    (mGlobal, mCloseRequest, mController, mInFlightWriteRequest,
+     mInFlightCloseRequest, mPendingAbortRequestPromise, mWriter,
+     mWriteRequests),
+    (mPendingAbortRequestReason, mStoredError))
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(WritableStream)
+NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_LAST_RELEASE(WritableStream,
+                                                   LastRelease())
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(WritableStream)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+WritableStream::WritableStream(nsIGlobalObject* aGlobal,
+                               HoldDropJSObjectsCaller aHoldDropCaller)
+    : mGlobal(aGlobal), mHoldDropCaller(aHoldDropCaller) {
+  if (mHoldDropCaller == HoldDropJSObjectsCaller::Implicit) {
+    mozilla::HoldJSObjects(this);
+  }
+}
+
+WritableStream::WritableStream(const GlobalObject& aGlobal,
+                               HoldDropJSObjectsCaller aHoldDropCaller)
+    : mGlobal(do_QueryInterface(aGlobal.GetAsSupports())),
+      mHoldDropCaller(aHoldDropCaller) {
+  if (mHoldDropCaller == HoldDropJSObjectsCaller::Implicit) {
+    mozilla::HoldJSObjects(this);
+  }
+}
+
+WritableStream::~WritableStream() {
+  if (mHoldDropCaller == HoldDropJSObjectsCaller::Implicit) {
+    mozilla::DropJSObjects(this);
+  }
+}
+
+JSObject* WritableStream::WrapObject(JSContext* aCx,
+                                     JS::Handle<JSObject*> aGivenProto) {
+  return WritableStream_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+// https://streams.spec.whatwg.org/#writable-stream-deal-with-rejection
+void WritableStream::DealWithRejection(JSContext* aCx,
+                                       JS::Handle<JS::Value> aError,
+                                       ErrorResult& aRv) {
+  // Step 1. Let state be stream.[[state]].
+  // Step 2. If state is "writable",
+  if (mState == WriterState::Writable) {
+    // Step 2.1. Perform ! WritableStreamStartErroring(stream, error).
+    StartErroring(aCx, aError, aRv);
+
+    // Step 2.2. Return.
+    return;
+  }
+
+  // Step 3. Assert: state is "erroring".
+  MOZ_ASSERT(mState == WriterState::Erroring);
+
+  // Step 4. Perform ! WritableStreamFinishErroring(stream).
+  FinishErroring(aCx, aRv);
+}
+
+// https://streams.spec.whatwg.org/#writable-stream-finish-erroring
+void WritableStream::FinishErroring(JSContext* aCx, ErrorResult& aRv) {
+  // Step 1. Assert: stream.[[state]] is "erroring".
+  MOZ_ASSERT(mState == WriterState::Erroring);
+
+  // Step 2. Assert: ! WritableStreamHasOperationMarkedInFlight(stream) is
+  // false.
+  MOZ_ASSERT(!HasOperationMarkedInFlight());
+
+  // Step 3. Set stream.[[state]] to "errored".
+  mState = WriterState::Errored;
+
+  // Step 4. Perform ! stream.[[controller]].[[ErrorSteps]]().
+  Controller()->ErrorSteps();
+
+  // Step 5. Let storedError be stream.[[storedError]].
+  JS::Rooted<JS::Value> storedError(aCx, mStoredError);
+
+  // Step 6. For each writeRequest of stream.[[writeRequests]]:
+  for (const RefPtr<Promise>& writeRequest : mWriteRequests) {
+    // Step 6.1. Reject writeRequest with storedError.
+    writeRequest->MaybeReject(storedError);
+  }
+
+  // Step 7. Set stream.[[writeRequests]] to an empty list.
+  mWriteRequests.Clear();
+
+  // Step 8. If stream.[[pendingAbortRequest]] is undefined,
+  if (!mPendingAbortRequestPromise) {
+    // Step 8.1. Perform !
+    // WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream).
+    RejectCloseAndClosedPromiseIfNeeded();
+
+    // Step 8.2. Return.
+    return;
+  }
+
+  // Step 9. Let abortRequest be stream.[[pendingAbortRequest]].
+  RefPtr<Promise> abortPromise = mPendingAbortRequestPromise;
+  JS::Rooted<JS::Value> abortReason(aCx, mPendingAbortRequestReason);
+  bool abortWasAlreadyErroring = mPendingAbortRequestWasAlreadyErroring;
+
+  // Step 10. Set stream.[[pendingAbortRequest]] to undefined.
+  SetPendingAbortRequest(nullptr, JS::UndefinedHandleValue, false);
+
+  // Step 11. If abortRequest’s was already erroring is true,
+  if (abortWasAlreadyErroring) {
+    // Step 11.1. Reject abortRequest’s promise with storedError.
+    abortPromise->MaybeReject(storedError);
+
+    // Step 11.2. Perform !
+    // WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream).
+    RejectCloseAndClosedPromiseIfNeeded();
+
+    // Step 11.3. Return.
+    return;
+  }
+
+  // Step 12. Let promise be !
+  // stream.[[controller]].[[AbortSteps]](abortRequest’s reason).
+  RefPtr<WritableStreamDefaultController> controller = mController;
+  RefPtr<Promise> promise = controller->AbortSteps(aCx, abortReason, aRv);
+  if (aRv.Failed()) {
+    return;
+  }
+
+  // Step 13 + 14.
+  promise->AddCallbacksWithCycleCollectedArgs(
+      [](JSContext* aCx, JS::Handle<JS::Value> aValue, ErrorResult& aRv,
+         Promise* aAbortRequestPromise, WritableStream* aStream) {
+        // Step 13. Upon fulfillment of promise,
+        // Step 13.1. Resolve abortRequest’s promise with undefined.
+        aAbortRequestPromise->MaybeResolveWithUndefined();
+
+        // Step 13.2. Perform !
+        // WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream).
+        aStream->RejectCloseAndClosedPromiseIfNeeded();
+      },
+      [](JSContext* aCx, JS::Handle<JS::Value> aValue, ErrorResult& aRv,
+         Promise* aAbortRequestPromise, WritableStream* aStream) {
+        // Step 14. Upon rejection of promise with reason reason,
+        // Step 14.1. Reject abortRequest’s promise with reason.
+        aAbortRequestPromise->MaybeReject(aValue);
+
+        // Step 14.2. Perform !
+        // WritableStreamRejectCloseAndClosedPromiseIfNeeded(stream).
+        aStream->RejectCloseAndClosedPromiseIfNeeded();
+      },
+      RefPtr(abortPromise), RefPtr(this));
+}
+
+// https://streams.spec.whatwg.org/#writable-stream-finish-in-flight-close
+void WritableStream::FinishInFlightClose() {
+  // Step 1. Assert: stream.[[inFlightCloseRequest]] is not undefined.
+  MOZ_ASSERT(mInFlightCloseRequest);
+
+  // Step 2. Resolve stream.[[inFlightCloseRequest]] with undefined.
+  mInFlightCloseRequest->MaybeResolveWithUndefined();
+
+  // Step 3. Set stream.[[inFlightCloseRequest]] to undefined.
+  mInFlightCloseRequest = nullptr;
+
+  // Step 4. Let state be stream.[[state]].
+  // Step 5. Assert: stream.[[state]] is "writable" or "erroring".
+  MOZ_ASSERT(mState == WriterState::Writable ||
+             mState == WriterState::Erroring);
+
+  // Step 6. If state is "erroring",
+  if (mState == WriterState::Erroring) {
+    // Step 6.1. Set stream.[[storedError]] to undefined.
+    mStoredError.setUndefined();
+
+    // Step 6.2. If stream.[[pendingAbortRequest]] is not undefined,
+    if (mPendingAbortRequestPromise) {
+      // Step 6.2.1. Resolve stream.[[pendingAbortRequest]]'s promise with
+      // undefined.
+      mPendingAbortRequestPromise->MaybeResolveWithUndefined();
+
+      // Step 6.2.2. Set stream.[[pendingAbortRequest]] to undefined.
+      SetPendingAbortRequest(nullptr, JS::UndefinedHandleValue, false);
+    }
+  }
+
+  // Step 7. Set stream.[[state]] to "closed".
+  mState = WriterState::Closed;
+
+  // Step 8. Let writer be stream.[[writer]].
+  // Step 9. If writer is not undefined, resolve writer.[[closedPromise]] with
+  // undefined.
+  if (mWriter) {
+    mWriter->ClosedPromise()->MaybeResolveWithUndefined();
+  }
+
+  // Step 10. Assert: stream.[[pendingAbortRequest]] is undefined.
+  MOZ_ASSERT(!mPendingAbortRequestPromise);
+  // Assert: stream.[[storedError]] is undefined.
+  MOZ_ASSERT(mStoredError.isUndefined());
+}
+
+// https://streams.spec.whatwg.org/#writable-stream-finish-in-flight-close-with-error
+void WritableStream::FinishInFlightCloseWithError(JSContext* aCx,
+                                                  JS::Handle<JS::Value> aError,
+                                                  ErrorResult& aRv) {
+  // Step 1. Assert: stream.[[inFlightCloseRequest]] is not undefined.
+  MOZ_ASSERT(mInFlightCloseRequest);
+
+  // Step 2. Reject stream.[[inFlightCloseRequest]] with error.
+  mInFlightCloseRequest->MaybeReject(aError);
+
+  // Step 3. Set stream.[[inFlightCloseRequest]] to undefined.
+  mInFlightCloseRequest = nullptr;
+
+  // Step 4. Assert: stream.[[state]] is "writable" or "erroring".
+  MOZ_ASSERT(mState == WriterState::Writable ||
+             mState == WriterState::Erroring);
+
+  // Step 5. If stream.[[pendingAbortRequest]] is not undefined,
+  if (mPendingAbortRequestPromise) {
+    // Step 5.1. Reject stream.[[pendingAbortRequest]]'s promise with error.
+    mPendingAbortRequestPromise->MaybeReject(aError);
+
+    // Step 5.2. Set stream.[[pendingAbortRequest]] to undefined.
+    SetPendingAbortRequest(nullptr, JS::UndefinedHandleValue, false);
+  }
+
+  // Step 6. Perform ! WritableStreamDealWithRejection(stream, error).
+  DealWithRejection(aCx, aError, aRv);
+}
+
+// https://streams.spec.whatwg.org/#writable-stream-finish-in-flight-write
+void WritableStream::FinishInFlightWrite() {
+  // Step 1. Assert: stream.[[inFlightWriteRequest]] is not undefined.
+  MOZ_ASSERT(mInFlightWriteRequest);
+
+  // Step 2. Resolve stream.[[inFlightWriteRequest]] with undefined.
+  mInFlightWriteRequest->MaybeResolveWithUndefined();
+
+  // Step 3. Set stream.[[inFlightWriteRequest]] to undefined.
+  mInFlightWriteRequest = nullptr;
+}
+
+// https://streams.spec.whatwg.org/#writable-stream-finish-in-flight-write-with-error
+void WritableStream::FinishInFlightWriteWithError(JSContext* aCx,
+                                                  JS::Handle<JS::Value> aError,
+                                                  ErrorResult& aRv) {
+  // Step 1. Assert: stream.[[inFlightWriteRequest]] is not undefined.
+  MOZ_ASSERT(mInFlightWriteRequest);
+
+  // Step 2. Reject stream.[[inFlightWriteRequest]] with error.
+  mInFlightWriteRequest->MaybeReject(aError);
+
+  // Step 3. Set stream.[[inFlightWriteRequest]] to undefined.
+  mInFlightWriteRequest = nullptr;
+
+  // Step 4. Assert: stream.[[state]] is "writable" or "erroring".
+  MOZ_ASSERT(mState == WriterState::Writable ||
+             mState == WriterState::Erroring);
+
+  // Step 5. Perform ! WritableStreamDealWithRejection(stream, error).
+  DealWithRejection(aCx, aError, aRv);
+}
+
+// https://streams.spec.whatwg.org/#writable-stream-mark-close-request-in-flight
+void WritableStream::MarkCloseRequestInFlight() {
+  // Step 1. Assert: stream.[[inFlightCloseRequest]] is undefined.
+  MOZ_ASSERT(!mInFlightCloseRequest);
+
+  // Step 2. Assert: stream.[[closeRequest]] is not undefined.
+  MOZ_ASSERT(mCloseRequest);
+
+  // Step 3. Set stream.[[inFlightCloseRequest]] to stream.[[closeRequest]].
+  mInFlightCloseRequest = mCloseRequest;
+
+  // Step 4. Set stream.[[closeRequest]] to undefined.
+  mCloseRequest = nullptr;
+}
+
+// https://streams.spec.whatwg.org/#writable-stream-mark-first-write-request-in-flight
+void WritableStream::MarkFirstWriteRequestInFlight() {
+  // Step 1. Assert: stream.[[inFlightWriteRequest]] is undefined.
+  MOZ_ASSERT(!mInFlightWriteRequest);
+
+  // Step 2. Assert: stream.[[writeRequests]] is not empty.
+  MOZ_ASSERT(!mWriteRequests.IsEmpty());
+
+  // Step 3. Let writeRequest be stream.[[writeRequests]][0].
+  RefPtr<Promise> writeRequest = mWriteRequests.ElementAt(0);
+
+  // Step 4. Remove writeRequest from stream.[[writeRequests]].
+  mWriteRequests.RemoveElementAt(0);
+
+  // Step 5. Set stream.[[inFlightWriteRequest]] to writeRequest.
+  mInFlightWriteRequest = writeRequest;
+}
+
+// https://streams.spec.whatwg.org/#writable-stream-reject-close-and-closed-promise-if-needed
+void WritableStream::RejectCloseAndClosedPromiseIfNeeded() {
+  // Step 1. Assert: stream.[[state]] is "errored".
+  MOZ_ASSERT(mState == WriterState::Errored);
+
+  JS::Rooted<JS::Value> storedError(RootingCx(), mStoredError);
+  // Step 2. If stream.[[closeRequest]] is not undefined,
+  if (mCloseRequest) {
+    // Step 2.1. Assert: stream.[[inFlightCloseRequest]] is undefined.
+    MOZ_ASSERT(!mInFlightCloseRequest);
+
+    // Step 2.2. Reject stream.[[closeRequest]] with stream.[[storedError]].
+    mCloseRequest->MaybeReject(storedError);
+
+    // Step 2.3. Set stream.[[closeRequest]] to undefined.
+    mCloseRequest = nullptr;
+  }
+
+  // Step 3. Let writer be stream.[[writer]].
+  RefPtr<WritableStreamDefaultWriter> writer = mWriter;
+
+  // Step 4. If writer is not undefined,
+  if (writer) {
+    // Step 4.1. Reject writer.[[closedPromise]] with stream.[[storedError]].
+    RefPtr<Promise> closedPromise = writer->ClosedPromise();
+    closedPromise->MaybeReject(storedError);
+
+    // Step 4.2. Set writer.[[closedPromise]].[[PromiseIsHandled]] to true.
+    closedPromise->SetSettledPromiseIsHandled();
+  }
+}
+
+// https://streams.spec.whatwg.org/#writable-stream-start-erroring
+void WritableStream::StartErroring(JSContext* aCx,
+                                   JS::Handle<JS::Value> aReason,
+                                   ErrorResult& aRv) {
+  // Step 1. Assert: stream.[[storedError]] is undefined.
+  MOZ_ASSERT(mStoredError.isUndefined());
+
+  // Step 2. Assert: stream.[[state]] is "writable".
+  MOZ_ASSERT(mState == WriterState::Writable);
+
+  // Step 3. Let controller be stream.[[controller]].
+  RefPtr<WritableStreamDefaultController> controller = mController;
+  // Step 4. Assert: controller is not undefined.
+  MOZ_ASSERT(controller);
+
+  // Step 5. Set stream.[[state]] to "erroring".
+  mState = WriterState::Erroring;
+
+  // Step 6. Set stream.[[storedError]] to reason.
+  mStoredError = aReason;
+
+  // Step 7. Let writer be stream.[[writer]].
+  RefPtr<WritableStreamDefaultWriter> writer = mWriter;
+  // Step 8. If writer is not undefined, perform !
+  // WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, reason).
+  if (writer) {
+    WritableStreamDefaultWriterEnsureReadyPromiseRejected(writer, aReason);
+  }
+
+  // Step 9. If ! WritableStreamHasOperationMarkedInFlight(stream) is false
+  // and controller.[[started]] is true,
+  // perform !WritableStreamFinishErroring(stream).
+  if (!HasOperationMarkedInFlight() && controller->Started()) {
+    FinishErroring(aCx, aRv);
+  }
+}
+
+// https://streams.spec.whatwg.org/#writable-stream-update-backpressure
+void WritableStream::UpdateBackpressure(bool aBackpressure) {
+  // Step 1. Assert: stream.[[state]] is "writable".
+  MOZ_ASSERT(mState == WriterState::Writable);
+  // Step 2. Assert: ! WritableStreamCloseQueuedOrInFlight(stream) is false.
+  MOZ_ASSERT(!CloseQueuedOrInFlight());
+
+  // Step 3. Let writer be stream.[[writer]].
+  RefPtr<WritableStreamDefaultWriter> writer = mWriter;
+
+  // Step 4. If writer is not undefined and backpressure is not
+  // stream.[[backpressure]],
+  if (writer && aBackpressure != mBackpressure) {
+    // Step 4.1. If backpressure is true, set writer.[[readyPromise]] to a new
+    // promise.
+    if (aBackpressure) {
+      RefPtr<Promise> promise =
+          Promise::CreateInfallible(writer->GetParentObject());
+      writer->SetReadyPromise(promise);
+    } else {
+      // Step 4.2. Otherwise,
+      // Step 4.2.1. Assert: backpressure is false.
+      // Step 4.2.2. Resolve writer.[[readyPromise]] with undefined.
+      writer->ReadyPromise()->MaybeResolveWithUndefined();
+    }
+  }
+
+  // Step 5. Set stream.[[backpressure]] to backpressure.
+  mBackpressure = aBackpressure;
+}
+
+// https://streams.spec.whatwg.org/#ws-constructor
+already_AddRefed<WritableStream> WritableStream::Constructor(
+    const GlobalObject& aGlobal,
+    const Optional<JS::Handle<JSObject*>>& aUnderlyingSink,
+    const QueuingStrategy& aStrategy, ErrorResult& aRv) {
+  // Step 1. If underlyingSink is missing, set it to null.
+  JS::Rooted<JSObject*> underlyingSinkObj(
+      aGlobal.Context(),
+      aUnderlyingSink.WasPassed() ? aUnderlyingSink.Value() : nullptr);
+
+  // Step 2. Let underlyingSinkDict be underlyingSink, converted to
+  //         an IDL value of type UnderlyingSink.
+  RootedDictionary<UnderlyingSink> underlyingSinkDict(aGlobal.Context());
+  if (underlyingSinkObj) {
+    JS::Rooted<JS::Value> objValue(aGlobal.Context(),
+                                   JS::ObjectValue(*underlyingSinkObj));
+    dom::BindingCallContext callCx(aGlobal.Context(),
+                                   "WritableStream.constructor");
+    aRv.MightThrowJSException();
+    if (!underlyingSinkDict.Init(callCx, objValue)) {
+      aRv.StealExceptionFromJSContext(aGlobal.Context());
+      return nullptr;
+    }
+  }
+
+  // Step 3. If underlyingSinkDict["type"] exists, throw a RangeError exception.
+  if (!underlyingSinkDict.mType.isUndefined()) {
+    aRv.ThrowRangeError("Implementation preserved member 'type'");
+    return nullptr;
+  }
+
+  // Step 4. Perform ! InitializeWritableStream(this).
+  RefPtr<WritableStream> writableStream =
+      new WritableStream(aGlobal, HoldDropJSObjectsCaller::Implicit);
+
+  // Step 5. Let sizeAlgorithm be ! ExtractSizeAlgorithm(strategy).
+  //
+  // Implementation Note: The specification demands that if the size doesn't
+  // exist, we instead would provide an algorithm that returns 1. Instead, we
+  // will teach callers that a missing callback should simply return 1, rather
+  // than gin up a fake callback here.
+  //
+  // This decision may need to be revisited if the default action ever diverges
+  // within the specification.
+  RefPtr<QueuingStrategySize> sizeAlgorithm =
+      aStrategy.mSize.WasPassed() ? &aStrategy.mSize.Value() : nullptr;
+
+  // Step 6. Let highWaterMark be ? ExtractHighWaterMark(strategy, 1).
+  double highWaterMark = ExtractHighWaterMark(aStrategy, 1, aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  // Step 7. Perform ? SetUpWritableStreamDefaultControllerFromUnderlyingSink(
+  // this, underlyingSink, underlyingSinkDict, highWaterMark, sizeAlgorithm).
+  SetUpWritableStreamDefaultControllerFromUnderlyingSink(
+      aGlobal.Context(), writableStream, underlyingSinkObj, underlyingSinkDict,
+      highWaterMark, sizeAlgorithm, aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  return writableStream.forget();
+}
+
+namespace streams_abstract {
+// https://streams.spec.whatwg.org/#writable-stream-abort
+already_AddRefed<Promise> WritableStreamAbort(JSContext* aCx,
+                                              WritableStream* aStream,
+                                              JS::Handle<JS::Value> aReason,
+                                              ErrorResult& aRv) {
+  // Step 1. If stream.[[state]] is "closed" or "errored", return a promise
+  // resolved with undefined.
+  if (aStream->State() == WritableStream::WriterState::Closed ||
+      aStream->State() == WritableStream::WriterState::Errored) {
+    RefPtr<Promise> promise =
+        Promise::CreateInfallible(aStream->GetParentObject());
+    promise->MaybeResolveWithUndefined();
+    return promise.forget();
+  }
+
+  // Step 2. Signal abort on stream.[[controller]].[[signal]] with reason.
+  RefPtr<WritableStreamDefaultController> controller = aStream->Controller();
+  controller->Signal()->SignalAbort(aReason);
+
+  // Step 3. Let state be stream.[[state]].
+  WritableStream::WriterState state = aStream->State();
+
+  // Step 4. If state is "closed" or "errored", return a promise resolved with
+  // undefined. Note: We re-check the state because signaling abort runs author
+  // code and that might have changed the state.
+  if (aStream->State() == WritableStream::WriterState::Closed ||
+      aStream->State() == WritableStream::WriterState::Errored) {
+    RefPtr<Promise> promise =
+        Promise::CreateInfallible(aStream->GetParentObject());
+    promise->MaybeResolveWithUndefined();
+    return promise.forget();
+  }
+
+  // Step 5. If stream.[[pendingAbortRequest]] is not undefined, return
+  // stream.[[pendingAbortRequest]]'s promise.
+  if (aStream->GetPendingAbortRequestPromise()) {
+    RefPtr<Promise> promise = aStream->GetPendingAbortRequestPromise();
+    return promise.forget();
+  }
+
+  // Step 6. Assert: state is "writable" or "erroring".
+  MOZ_ASSERT(state == WritableStream::WriterState::Writable ||
+             state == WritableStream::WriterState::Erroring);
+
+  // Step 7. Let wasAlreadyErroring be false.
+  bool wasAlreadyErroring = false;
+
+  // Step 8. If state is "erroring",
+  JS::Rooted<JS::Value> reason(aCx, aReason);
+  if (state == WritableStream::WriterState::Erroring) {
+    // Step 8.1. Set wasAlreadyErroring to true.
+    wasAlreadyErroring = true;
+    // Step 8.2. Set reason to undefined.
+    reason.setUndefined();
+  }
+
+  // Step 9. Let promise be a new promise.
+  RefPtr<Promise> promise =
+      Promise::CreateInfallible(aStream->GetParentObject());
+
+  // Step 10. Set stream.[[pendingAbortRequest]] to a new pending abort request
+  // whose promise is promise, reason is reason, and was already erroring is
+  // wasAlreadyErroring.
+  aStream->SetPendingAbortRequest(promise, reason, wasAlreadyErroring);
+
+  // Step 11. If wasAlreadyErroring is false, perform !
+  // WritableStreamStartErroring(stream, reason).
+  if (!wasAlreadyErroring) {
+    aStream->StartErroring(aCx, reason, aRv);
+    if (aRv.Failed()) {
+      return nullptr;
+    }
+  }
+
+  // Step 12. Return promise.
+  return promise.forget();
+}
+}  // namespace streams_abstract
+
+// https://streams.spec.whatwg.org/#ws-abort
+already_AddRefed<Promise> WritableStream::Abort(JSContext* aCx,
+                                                JS::Handle<JS::Value> aReason,
+                                                ErrorResult& aRv) {
+  // Step 1. If ! IsWritableStreamLocked(this) is true, return a promise
+  // rejected with a TypeError exception.
+  if (Locked()) {
+    return Promise::CreateRejectedWithTypeError(
+        GetParentObject(), "Canceled Locked Stream"_ns, aRv);
+  }
+
+  // Step 2. Return ! WritableStreamAbort(this, reason).
+  RefPtr<WritableStream> thisRefPtr = this;
+  return WritableStreamAbort(aCx, thisRefPtr, aReason, aRv);
+}
+
+namespace streams_abstract {
+// https://streams.spec.whatwg.org/#writable-stream-close
+already_AddRefed<Promise> WritableStreamClose(JSContext* aCx,
+                                              WritableStream* aStream,
+                                              ErrorResult& aRv) {
+  // Step 1. Let state be stream.[[state]].
+  WritableStream::WriterState state = aStream->State();
+
+  // Step 2. If state is "closed" or "errored", return a promise rejected with a
+  // TypeError exception.
+  if (state == WritableStream::WriterState::Closed ||
+      state == WritableStream::WriterState::Errored) {
+    return Promise::CreateRejectedWithTypeError(
+        aStream->GetParentObject(),
+        "Can not close stream after closing or error"_ns, aRv);
+  }
+
+  // Step 3. Assert: state is "writable" or "erroring".
+  MOZ_ASSERT(state == WritableStream::WriterState::Writable ||
+             state == WritableStream::WriterState::Erroring);
+
+  // Step 4. Assert: ! WritableStreamCloseQueuedOrInFlight(stream) is false.
+  MOZ_ASSERT(!aStream->CloseQueuedOrInFlight());
+
+  // Step 5. Let promise be a new promise.
+  RefPtr<Promise> promise =
+      Promise::CreateInfallible(aStream->GetParentObject());
+
+  // Step 6. Set stream.[[closeRequest]] to promise.
+  aStream->SetCloseRequest(promise);
+
+  // Step 7. Let writer be stream.[[writer]].
+  RefPtr<WritableStreamDefaultWriter> writer = aStream->GetWriter();
+
+  // Step 8. If writer is not undefined, and stream.[[backpressure]] is true,
+  // and state is "writable", resolve writer.[[readyPromise]] with undefined.
+  if (writer && aStream->Backpressure() &&
+      state == WritableStream::WriterState::Writable) {
+    writer->ReadyPromise()->MaybeResolveWithUndefined();
+  }
+
+  // Step 9.
+  // Perform ! WritableStreamDefaultControllerClose(stream.[[controller]]).
+  RefPtr<WritableStreamDefaultController> controller = aStream->Controller();
+  WritableStreamDefaultControllerClose(aCx, controller, aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  // Step 10. Return promise.
+  return promise.forget();
+}
+}  // namespace streams_abstract
+
+// https://streams.spec.whatwg.org/#ws-close
+already_AddRefed<Promise> WritableStream::Close(JSContext* aCx,
+                                                ErrorResult& aRv) {
+  // Step 1. If ! IsWritableStreamLocked(this) is true, return a promise
+  // rejected with a TypeError exception.
+  if (Locked()) {
+    return Promise::CreateRejectedWithTypeError(
+        GetParentObject(), "Can not close locked stream"_ns, aRv);
+  }
+
+  // Step 2. If ! WritableStreamCloseQueuedOrInFlight(this) is true, return a
+  // promise rejected with a TypeError exception.
+  if (CloseQueuedOrInFlight()) {
+    return Promise::CreateRejectedWithTypeError(
+        GetParentObject(), "Stream is already closing"_ns, aRv);
+  }
+
+  // Step 3. Return ! WritableStreamClose(this).
+  RefPtr<WritableStream> thisRefPtr = this;
+  return WritableStreamClose(aCx, thisRefPtr, aRv);
+}
+
+namespace streams_abstract {
+// https://streams.spec.whatwg.org/#acquire-writable-stream-default-writer
+already_AddRefed<WritableStreamDefaultWriter>
+AcquireWritableStreamDefaultWriter(WritableStream* aStream, ErrorResult& aRv) {
+  // Step 1. Let writer be a new WritableStreamDefaultWriter.
+  RefPtr<WritableStreamDefaultWriter> writer =
+      new WritableStreamDefaultWriter(aStream->GetParentObject());
+
+  // Step 2. Perform ? SetUpWritableStreamDefaultWriter(writer, stream).
+  SetUpWritableStreamDefaultWriter(writer, aStream, aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  // Step 3. Return writer.
+  return writer.forget();
+}
+}  // namespace streams_abstract
+
+// https://streams.spec.whatwg.org/#create-writable-stream
+already_AddRefed<WritableStream> WritableStream::CreateAbstract(
+    JSContext* aCx, nsIGlobalObject* aGlobal,
+    UnderlyingSinkAlgorithmsBase* aAlgorithms, double aHighWaterMark,
+    QueuingStrategySize* aSizeAlgorithm, ErrorResult& aRv) {
+  // Step 1: Assert: ! IsNonNegativeNumber(highWaterMark) is true.
+  MOZ_ASSERT(IsNonNegativeNumber(aHighWaterMark));
+
+  // Step 2: Let stream be a new WritableStream.
+  // Step 3: Perform ! InitializeWritableStream(stream).
+  RefPtr<WritableStream> stream = new WritableStream(
+      aGlobal, WritableStream::HoldDropJSObjectsCaller::Implicit);
+
+  // Step 4: Let controller be a new WritableStreamDefaultController.
+  auto controller =
+      MakeRefPtr<WritableStreamDefaultController>(aGlobal, *stream);
+
+  // Step 5: Perform ? SetUpWritableStreamDefaultController(stream, controller,
+  // startAlgorithm, writeAlgorithm, closeAlgorithm, abortAlgorithm,
+  // highWaterMark, sizeAlgorithm).
+  SetUpWritableStreamDefaultController(aCx, stream, controller, aAlgorithms,
+                                       aHighWaterMark, aSizeAlgorithm, aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  // Step 6: Return stream.
+  return stream.forget();
+}
+
+already_AddRefed<WritableStreamDefaultWriter> WritableStream::GetWriter(
+    ErrorResult& aRv) {
+  return AcquireWritableStreamDefaultWriter(this, aRv);
+}
+
+namespace streams_abstract {
+// https://streams.spec.whatwg.org/#writable-stream-add-write-request
+already_AddRefed<Promise> WritableStreamAddWriteRequest(
+    WritableStream* aStream) {
+  // Step 1. Assert: ! IsWritableStreamLocked(stream) is true.
+  MOZ_ASSERT(IsWritableStreamLocked(aStream));
+
+  // Step 2. Assert: stream.[[state]] is "writable".
+  MOZ_ASSERT(aStream->State() == WritableStream::WriterState::Writable);
+
+  // Step 3. Let promise be a new promise.
+  RefPtr<Promise> promise =
+      Promise::CreateInfallible(aStream->GetParentObject());
+
+  // Step 4. Append promise to stream.[[writeRequests]].
+  aStream->AppendWriteRequest(promise);
+
+  // Step 5. Return promise.
+  return promise.forget();
+}
+}  // namespace streams_abstract
+
+// https://streams.spec.whatwg.org/#writablestream-set-up
+// _BOUNDARY because `aAlgorithms->StartCallback` (called by
+// SetUpWritableStreamDefaultController below) should not be able to run script
+// in this case.
+MOZ_CAN_RUN_SCRIPT_BOUNDARY void WritableStream::SetUpNative(
+    JSContext* aCx, UnderlyingSinkAlgorithmsWrapper& aAlgorithms,
+    Maybe<double> aHighWaterMark, QueuingStrategySize* aSizeAlgorithm,
+    ErrorResult& aRv) {
+  // an optional number highWaterMark (default 1)
+  double highWaterMark = aHighWaterMark.valueOr(1);
+  // and if given, highWaterMark must be a non-negative, non-NaN number.
+  MOZ_ASSERT(IsNonNegativeNumber(highWaterMark));
+
+  // Step 1: Let startAlgorithm be an algorithm that returns undefined.
+  // Step 2: Let closeAlgorithmWrapper be an algorithm that runs these steps:
+  // Step 3: Let abortAlgorithmWrapper be an algorithm that runs these steps:
+  // (Covered by UnderlyingSinkAlgorithmsWrapper)
+
+  // Step 4: If sizeAlgorithm was not given, then set it to an algorithm that
+  // returns 1. (Callers will treat nullptr as such, see
+  // WritableStream::Constructor for details)
+
+  // Step 5: Perform ! InitializeWritableStream(stream).
+  // (Covered by the constructor)
+
+  // Step 6: Let controller be a new WritableStreamDefaultController.
+  auto controller =
+      MakeRefPtr<WritableStreamDefaultController>(GetParentObject(), *this);
+
+  // Step 7: Perform ! SetUpWritableStreamDefaultController(stream, controller,
+  // startAlgorithm, writeAlgorithm, closeAlgorithmWrapper,
+  // abortAlgorithmWrapper, highWaterMark, sizeAlgorithm).
+  SetUpWritableStreamDefaultController(aCx, this, controller, &aAlgorithms,
+                                       highWaterMark, aSizeAlgorithm, aRv);
+}
+
+already_AddRefed<WritableStream> WritableStream::CreateNative(
+    JSContext* aCx, nsIGlobalObject& aGlobal,
+    UnderlyingSinkAlgorithmsWrapper& aAlgorithms, Maybe<double> aHighWaterMark,
+    QueuingStrategySize* aSizeAlgorithm, ErrorResult& aRv) {
+  RefPtr<WritableStream> stream = new WritableStream(
+      &aGlobal, WritableStream::HoldDropJSObjectsCaller::Implicit);
+  stream->SetUpNative(aCx, aAlgorithms, aHighWaterMark, aSizeAlgorithm, aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+  return stream.forget();
+}
+
+// https://streams.spec.whatwg.org/#writablestream-error
+// To error a WritableStream stream given a JavaScript value e, perform !
+// WritableStreamDefaultControllerErrorIfNeeded(stream.[[controller]], e).
+void WritableStream::ErrorNative(JSContext* aCx, JS::Handle<JS::Value> aError,
+                                 ErrorResult& aRv) {
+  // MOZ_KnownLive here instead of MOZ_KNOWN_LIVE at the field, because
+  // mController is set outside of the constructor
+  WritableStreamDefaultControllerErrorIfNeeded(aCx, MOZ_KnownLive(mController),
+                                               aError, aRv);
+}
+
+}  // namespace mozilla::dom