Quelle BodyConsumer.cpp Sprache: C

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "BodyConsumer.h"

#include "mozilla/dom/BlobBinding.h"
#include "mozilla/dom/BlobImpl.h"
#include "mozilla/dom/BlobURLProtocolHandler.h"
#include "mozilla/dom/BodyUtil.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/FileBinding.h"
#include "mozilla/dom/FileCreatorHelper.h"
#include "mozilla/dom/MutableBlobStreamListener.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/PromiseNativeHandler.h"
#include "mozilla/dom/WorkerCommon.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "mozilla/dom/WorkerRef.h"
#include "mozilla/dom/WorkerRunnable.h"
#include "mozilla/dom/WorkerScope.h"
#include "mozilla/ipc/PBackgroundSharedTypes.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/TaskQueue.h"
#include "nsComponentManagerUtils.h"
#include "nsIFile.h"
#include "nsIThreadRetargetableRequest.h"
#include "nsIStreamLoader.h"
#include "nsNetUtil.h"
#include "nsProxyRelease.h"
#include "nsIInputStream.h"

// Undefine the macro of CreateFile to avoid FileCreatorHelper#CreateFile being
// replaced by FileCreatorHelper#CreateFileW.
#ifdef CreateFile
#  undef CreateFile
#endif

namespace mozilla::dom {

namespace {

class BeginConsumeBodyRunnable final : public Runnable {
public:
  BeginConsumeBodyRunnable(BodyConsumer* aConsumer,
                           ThreadSafeWorkerRef* aWorkerRef)
      : Runnable("BeginConsumeBodyRunnable"),
        mBodyConsumer(aConsumer),
        mWorkerRef(aWorkerRef) {}

  NS_IMETHOD
  Run() override {
    mBodyConsumer->BeginConsumeBodyMainThread(mWorkerRef);
    return NS_OK;
  }

private:
  RefPtr<BodyConsumer> mBodyConsumer;
  RefPtr<ThreadSafeWorkerRef> mWorkerRef;
};

/*
* Called on successfully reading the complete stream.
*/
class ContinueConsumeBodyRunnable final : public MainThreadWorkerRunnable {
  RefPtr<BodyConsumer> mBodyConsumer;
  nsresult mStatus;
  uint32_t mLength;
  uint8_t* mResult;

public:
  ContinueConsumeBodyRunnable(BodyConsumer* aBodyConsumer,
                              WorkerPrivate* aWorkerPrivate, nsresult aStatus,
                              uint32_t aLength, uint8_t* aResult)
      : MainThreadWorkerRunnable("ContinueConsumeBodyRunnable"),
        mBodyConsumer(aBodyConsumer),
        mStatus(aStatus),
        mLength(aLength),
        mResult(aResult) {
    MOZ_ASSERT(NS_IsMainThread());
  }

  bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
    mBodyConsumer->ContinueConsumeBody(mStatus, mLength, mResult);
    return true;
  }
};

// ControlRunnable used to complete the releasing of resources on the worker
// thread when already shutting down.
class AbortConsumeBodyControlRunnable final
    : public MainThreadWorkerControlRunnable {
  RefPtr<BodyConsumer> mBodyConsumer;

public:
  AbortConsumeBodyControlRunnable(BodyConsumer* aBodyConsumer,
                                  WorkerPrivate* aWorkerPrivate)
      : MainThreadWorkerControlRunnable("AbortConsumeBodyControlRunnable"),
        mBodyConsumer(aBodyConsumer) {
    MOZ_ASSERT(NS_IsMainThread());
  }

  bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
    mBodyConsumer->ContinueConsumeBody(NS_BINDING_ABORTED, 0, nullptr,
                                       true /* shutting down */);
    return true;
  }
};

/*
* In case of failure to create a stream pump or dispatch stream completion to
* worker, ensure we cleanup properly. Thread agnostic.
*/
class MOZ_STACK_CLASS AutoFailConsumeBody final {
public:
  AutoFailConsumeBody(BodyConsumer* aBodyConsumer,
                      ThreadSafeWorkerRef* aWorkerRef)
      : mBodyConsumer(aBodyConsumer), mWorkerRef(aWorkerRef) {}

  ~AutoFailConsumeBody() {
    AssertIsOnMainThread();

    if (!mBodyConsumer) {
      return;
    }

    // Web Worker
    if (mWorkerRef) {
      RefPtr<AbortConsumeBodyControlRunnable> r =
          new AbortConsumeBodyControlRunnable(mBodyConsumer,
                                              mWorkerRef->Private());
      if (!r->Dispatch(mWorkerRef->Private())) {
        MOZ_CRASH("We are going to leak");
      }
      return;
    }

    // Main-thread
    mBodyConsumer->ContinueConsumeBody(NS_ERROR_FAILURE, 0, nullptr);
  }

  void DontFail() { mBodyConsumer = nullptr; }

private:
  RefPtr<BodyConsumer> mBodyConsumer;
  RefPtr<ThreadSafeWorkerRef> mWorkerRef;
};

/*
* Called on successfully reading the complete stream for Blob.
*/
class ContinueConsumeBlobBodyRunnable final : public MainThreadWorkerRunnable {
  RefPtr<BodyConsumer> mBodyConsumer;
  RefPtr<BlobImpl> mBlobImpl;

public:
  ContinueConsumeBlobBodyRunnable(BodyConsumer* aBodyConsumer,
                                  WorkerPrivate* aWorkerPrivate,
                                  BlobImpl* aBlobImpl)
      : MainThreadWorkerRunnable("ContinueConsumeBlobBodyRunnable"),
        mBodyConsumer(aBodyConsumer),
        mBlobImpl(aBlobImpl) {
    MOZ_ASSERT(NS_IsMainThread());
    MOZ_ASSERT(mBlobImpl);
  }

  bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
    mBodyConsumer->ContinueConsumeBlobBody(mBlobImpl);
    return true;
  }
};

// ControlRunnable used to complete the releasing of resources on the worker
// thread when already shutting down.
class AbortConsumeBlobBodyControlRunnable final
    : public MainThreadWorkerControlRunnable {
  RefPtr<BodyConsumer> mBodyConsumer;

public:
  AbortConsumeBlobBodyControlRunnable(BodyConsumer* aBodyConsumer,
                                      WorkerPrivate* aWorkerPrivate)
      : MainThreadWorkerControlRunnable("AbortConsumeBlobBodyControlRunnable"),
        mBodyConsumer(aBodyConsumer) {
    MOZ_ASSERT(NS_IsMainThread());
  }

  bool WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override {
    mBodyConsumer->ContinueConsumeBlobBody(nullptr, true /* shutting down */);
    return true;
  }
};

class ConsumeBodyDoneObserver final : public nsIStreamLoaderObserver,
                                      public MutableBlobStorageCallback {
public:
  NS_DECL_THREADSAFE_ISUPPORTS

  ConsumeBodyDoneObserver(BodyConsumer* aBodyConsumer,
                          ThreadSafeWorkerRef* aWorkerRef)
      : mBodyConsumer(aBodyConsumer), mWorkerRef(aWorkerRef) {}

  NS_IMETHOD
  OnStreamComplete(nsIStreamLoader* aLoader, nsISupports* aCtxt,
                   nsresult aStatus, uint32_t aResultLength,
                   const uint8_t* aResult) override {
    MOZ_ASSERT(NS_IsMainThread());

    // The loading is completed. Let's nullify the pump before continuing the
    // consuming of the body.
    mBodyConsumer->NullifyConsumeBodyPump();

    uint8_t* nonconstResult = const_cast<uint8_t*>(aResult);

    // Main-thread.
    if (!mWorkerRef) {
      mBodyConsumer->ContinueConsumeBody(aStatus, aResultLength,
                                         nonconstResult);
      // The caller is responsible for data.
      return NS_SUCCESS_ADOPTED_DATA;
    }

    // Web Worker.
    {
      RefPtr<ContinueConsumeBodyRunnable> r = new ContinueConsumeBodyRunnable(
          mBodyConsumer, mWorkerRef->Private(), aStatus, aResultLength,
          nonconstResult);
      if (r->Dispatch(mWorkerRef->Private())) {
        // The caller is responsible for data.
        return NS_SUCCESS_ADOPTED_DATA;
      }
    }

    // The worker is shutting down. Let's use a control runnable to complete the
    // shutting down procedure.

    RefPtr<AbortConsumeBodyControlRunnable> r =
        new AbortConsumeBodyControlRunnable(mBodyConsumer,
                                            mWorkerRef->Private());
    if (NS_WARN_IF(!r->Dispatch(mWorkerRef->Private()))) {
      return NS_ERROR_FAILURE;
    }

    // We haven't taken ownership of the data.
    return NS_OK;
  }

  virtual void BlobStoreCompleted(MutableBlobStorage* aBlobStorage,
                                  BlobImpl* aBlobImpl, nsresult aRv) override {
    // On error.
    if (NS_FAILED(aRv)) {
      OnStreamComplete(nullptr, nullptr, aRv, 0, nullptr);
      return;
    }

    // The loading is completed. Let's nullify the pump before continuing the
    // consuming of the body.
    mBodyConsumer->NullifyConsumeBodyPump();

    mBodyConsumer->OnBlobResult(aBlobImpl, mWorkerRef);
  }

private:
  ~ConsumeBodyDoneObserver() = default;

  RefPtr<BodyConsumer> mBodyConsumer;
  RefPtr<ThreadSafeWorkerRef> mWorkerRef;
};

NS_IMPL_ISUPPORTS(ConsumeBodyDoneObserver, nsIStreamLoaderObserver)

}  // namespace

/* static */ already_AddRefed<Promise> BodyConsumer::Create(
    nsIGlobalObject* aGlobal, nsISerialEventTarget* aMainThreadEventTarget,
    nsIInputStream* aBodyStream, AbortSignalImpl* aSignalImpl,
    ConsumeType aType, const nsACString& aBodyBlobURISpec,
    const nsAString& aBodyLocalPath, const nsACString& aBodyMimeType,
    const nsACString& aMixedCaseMimeType,
    MutableBlobStorage::MutableBlobStorageType aBlobStorageType,
    ErrorResult& aRv) {
  MOZ_ASSERT(aBodyStream);
  MOZ_ASSERT(aMainThreadEventTarget);

  RefPtr<Promise> promise = Promise::Create(aGlobal, aRv);
  if (aRv.Failed()) {
    return nullptr;
  }

  RefPtr<BodyConsumer> consumer =
      new BodyConsumer(aMainThreadEventTarget, aGlobal, aBodyStream, promise,
                       aType, aBodyBlobURISpec, aBodyLocalPath, aBodyMimeType,
                       aMixedCaseMimeType, aBlobStorageType);

  RefPtr<ThreadSafeWorkerRef> workerRef;

  if (!NS_IsMainThread()) {
    WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
    MOZ_ASSERT(workerPrivate);

    RefPtr<StrongWorkerRef> strongWorkerRef =
        StrongWorkerRef::Create(workerPrivate, "BodyConsumer", [consumer]() {
          consumer->mConsumePromise = nullptr;
          consumer->mBodyConsumed = true;
          consumer->ReleaseObject();
          consumer->ShutDownMainThreadConsuming();
        });
    if (NS_WARN_IF(!strongWorkerRef)) {
      aRv.Throw(NS_ERROR_FAILURE);
      return nullptr;
    }

    workerRef = new ThreadSafeWorkerRef(strongWorkerRef);
  } else {
    consumer->GlobalTeardownObserver::BindToOwner(aGlobal);
    consumer->GlobalFreezeObserver::BindToOwner(aGlobal);
  }

  nsCOMPtr<nsIRunnable> r = new BeginConsumeBodyRunnable(consumer, workerRef);
  aRv = aMainThreadEventTarget->Dispatch(r.forget(), NS_DISPATCH_NORMAL);
  if (NS_WARN_IF(aRv.Failed())) {
    return nullptr;
  }

  if (aSignalImpl) {
    consumer->Follow(aSignalImpl);
  }

  return promise.forget();
}

void BodyConsumer::ReleaseObject() {
  AssertIsOnTargetThread();

  if (NS_IsMainThread()) {
    GlobalTeardownObserver::DisconnectFromOwner();
    DisconnectFreezeObserver();
  }

  mGlobal = nullptr;

  Unfollow();
}

BodyConsumer::BodyConsumer(
    nsISerialEventTarget* aMainThreadEventTarget,
    nsIGlobalObject* aGlobalObject, nsIInputStream* aBodyStream,
    Promise* aPromise, ConsumeType aType, const nsACString& aBodyBlobURISpec,
    const nsAString& aBodyLocalPath, const nsACString& aBodyMimeType,
    const nsACString& aMixedCaseMimeType,
    MutableBlobStorage::MutableBlobStorageType aBlobStorageType)
    : mTargetThread(NS_GetCurrentThread()),
      mMainThreadEventTarget(aMainThreadEventTarget),
      mBodyStream(aBodyStream),
      mBlobStorageType(aBlobStorageType),
      mBodyMimeType(aBodyMimeType),
      mMixedCaseMimeType(aMixedCaseMimeType),
      mBodyBlobURISpec(aBodyBlobURISpec),
      mBodyLocalPath(aBodyLocalPath),
      mGlobal(aGlobalObject),
      mConsumeType(aType),
      mConsumePromise(aPromise),
      mBodyConsumed(false),
      mShuttingDown(false) {
  MOZ_ASSERT(aMainThreadEventTarget);
  MOZ_ASSERT(aBodyStream);
  MOZ_ASSERT(aPromise);
}

BodyConsumer::~BodyConsumer() = default;

void BodyConsumer::AssertIsOnTargetThread() const {
  MOZ_ASSERT(NS_GetCurrentThread() == mTargetThread);
}

namespace {

class FileCreationHandler final : public PromiseNativeHandler {
public:
  NS_DECL_THREADSAFE_ISUPPORTS

  static void Create(Promise* aPromise, BodyConsumer* aConsumer,
                     ThreadSafeWorkerRef* aWorkerRef) {
    AssertIsOnMainThread();
    MOZ_ASSERT(aPromise);

    RefPtr<FileCreationHandler> handler =
        new FileCreationHandler(aConsumer, aWorkerRef);
    aPromise->AppendNativeHandler(handler);
  }

  void ResolvedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
                        ErrorResult& aRv) override {
    AssertIsOnMainThread();

    if (NS_WARN_IF(!aValue.isObject())) {
      mConsumer->OnBlobResult(nullptr, mWorkerRef);
      return;
    }

    RefPtr<Blob> blob;
    if (NS_WARN_IF(NS_FAILED(UNWRAP_OBJECT(Blob, &aValue.toObject(), blob)))) {
      mConsumer->OnBlobResult(nullptr, mWorkerRef);
      return;
    }

    mConsumer->OnBlobResult(blob->Impl(), mWorkerRef);
  }

  void RejectedCallback(JSContext* aCx, JS::Handle<JS::Value> aValue,
                        ErrorResult& aRv) override {
    AssertIsOnMainThread();

    mConsumer->OnBlobResult(nullptr, mWorkerRef);
  }

private:
  FileCreationHandler(BodyConsumer* aConsumer, ThreadSafeWorkerRef* aWorkerRef)
      : mConsumer(aConsumer), mWorkerRef(aWorkerRef) {
    AssertIsOnMainThread();
    MOZ_ASSERT(aConsumer);
  }

  ~FileCreationHandler() = default;

  RefPtr<BodyConsumer> mConsumer;
  RefPtr<ThreadSafeWorkerRef> mWorkerRef;
};

NS_IMPL_ISUPPORTS0(FileCreationHandler)

}  // namespace

nsresult BodyConsumer::GetBodyLocalFile(nsIFile** aFile) const {
  AssertIsOnMainThread();

  if (!mBodyLocalPath.Length()) {
    return NS_OK;
  }

  nsCOMPtr<nsIFile> file;
  MOZ_TRY(NS_NewLocalFile(mBodyLocalPath, getter_AddRefs(file)));

  bool exists;
  MOZ_TRY(file->Exists(&exists));
  if (!exists) {
    return NS_ERROR_FILE_NOT_FOUND;
  }

  bool isDir;
  MOZ_TRY(file->IsDirectory(&isDir));
  if (isDir) {
    return NS_ERROR_FILE_IS_DIRECTORY;
  }

  file.forget(aFile);
  return NS_OK;
}

/*
* BeginConsumeBodyMainThread() will automatically reject the consume promise
* and clean up on any failures, so there is no need for callers to do so,
* reflected in a lack of error return code.
*/
void BodyConsumer::BeginConsumeBodyMainThread(ThreadSafeWorkerRef* aWorkerRef) {
  AssertIsOnMainThread();

  AutoFailConsumeBody autoReject(this, aWorkerRef);

  if (mShuttingDown) {
    // We haven't started yet, but we have been terminated. AutoFailConsumeBody
    // will dispatch a runnable to release resources.
    return;
  }

  if (mConsumeType == ConsumeType::Blob) {
    nsresult rv;

    // If we're trying to consume a blob, and the request was for a blob URI,
    // then just consume that URI's blob instance.
    if (!mBodyBlobURISpec.IsEmpty()) {
      RefPtr<BlobImpl> blobImpl;
      rv = NS_GetBlobForBlobURISpec(mBodyBlobURISpec, getter_AddRefs(blobImpl));
      if (NS_WARN_IF(NS_FAILED(rv)) || !blobImpl) {
        return;
      }
      autoReject.DontFail();
      DispatchContinueConsumeBlobBody(blobImpl, aWorkerRef);
      return;
    }

    // If we're trying to consume a blob, and the request was for a local
    // file, then generate and return a File blob.
    nsCOMPtr<nsIFile> file;
    rv = GetBodyLocalFile(getter_AddRefs(file));
    if (!NS_WARN_IF(NS_FAILED(rv)) && file && !aWorkerRef) {
      ChromeFilePropertyBag bag;
      CopyUTF8toUTF16(mBodyMimeType, bag.mType);

      ErrorResult error;
      RefPtr<Promise> promise =
          FileCreatorHelper::CreateFile(mGlobal, file, bag, true, error);
      if (NS_WARN_IF(error.Failed())) {
        return;
      }

      autoReject.DontFail();
      FileCreationHandler::Create(promise, this, aWorkerRef);
      return;
    }
  }

  nsCOMPtr<nsIInputStreamPump> pump;
  nsresult rv =
      NS_NewInputStreamPump(getter_AddRefs(pump), mBodyStream.forget(), 0, 0,
                            false, mMainThreadEventTarget);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return;
  }

  RefPtr<ConsumeBodyDoneObserver> p =
      new ConsumeBodyDoneObserver(this, aWorkerRef);

  nsCOMPtr<nsIStreamListener> listener;
  if (mConsumeType == ConsumeType::Blob) {
    listener = new MutableBlobStreamListener(mBlobStorageType, mBodyMimeType, p,
                                             mMainThreadEventTarget);
  } else {
    nsCOMPtr<nsIStreamLoader> loader;
    rv = NS_NewStreamLoader(getter_AddRefs(loader), p);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      return;
    }

    listener = loader;
  }

  rv = pump->AsyncRead(listener);
  if (NS_WARN_IF(NS_FAILED(rv))) {
    return;
  }

  // Now that everything succeeded, we can assign the pump to a pointer that
  // stays alive for the lifetime of the BodyConsumer.
  mConsumeBodyPump = pump;

  // It is ok for retargeting to fail and reads to happen on the main thread.
  autoReject.DontFail();

  // Try to retarget, otherwise fall back to main thread.
  nsCOMPtr<nsIThreadRetargetableRequest> rr = do_QueryInterface(pump);
  if (rr) {
    nsCOMPtr<nsIEventTarget> sts =
        do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
    RefPtr<TaskQueue> queue =
        TaskQueue::Create(sts.forget(), "BodyConsumer STS Delivery Queue");
    rv = rr->RetargetDeliveryTo(queue);
    if (NS_FAILED(rv)) {
      NS_WARNING("Retargeting failed");
    }
  }
}

/*
* OnBlobResult() is called when a blob body is ready to be consumed (when its
* network transfer completes in BeginConsumeBodyRunnable or its local File has
* been wrapped by FileCreationHandler). The blob is sent to the target thread
* and ContinueConsumeBody is called.
*/
void BodyConsumer::OnBlobResult(BlobImpl* aBlobImpl,
                                ThreadSafeWorkerRef* aWorkerRef) {
  AssertIsOnMainThread();

  DispatchContinueConsumeBlobBody(aBlobImpl, aWorkerRef);
}

void BodyConsumer::DispatchContinueConsumeBlobBody(
    BlobImpl* aBlobImpl, ThreadSafeWorkerRef* aWorkerRef) {
  AssertIsOnMainThread();

  // Main-thread.
  if (!aWorkerRef) {
    if (aBlobImpl) {
      ContinueConsumeBlobBody(aBlobImpl);
    } else {
      ContinueConsumeBody(NS_ERROR_DOM_ABORT_ERR, 0, nullptr);
    }
    return;
  }

  // Web Worker.
  if (aBlobImpl) {
    RefPtr<ContinueConsumeBlobBodyRunnable> r =
        new ContinueConsumeBlobBodyRunnable(this, aWorkerRef->Private(),
                                            aBlobImpl);

    if (r->Dispatch(aWorkerRef->Private())) {
      return;
    }
  } else {
    RefPtr<ContinueConsumeBodyRunnable> r = new ContinueConsumeBodyRunnable(
        this, aWorkerRef->Private(), NS_ERROR_DOM_ABORT_ERR, 0, nullptr);

    if (r->Dispatch(aWorkerRef->Private())) {
      return;
    }
  }

  // The worker is shutting down. Let's use a control runnable to complete the
  // shutting down procedure.

  RefPtr<AbortConsumeBlobBodyControlRunnable> r =
      new AbortConsumeBlobBodyControlRunnable(this, aWorkerRef->Private());

  Unused << NS_WARN_IF(!r->Dispatch(aWorkerRef->Private()));
}

/*
* ContinueConsumeBody() is to be called on the target thread whenever the
* final result of the fetch is known. The fetch promise is resolved or
* rejected based on whether the fetch succeeded, and the body can be
* converted into the expected type of JS object.
*/
void BodyConsumer::ContinueConsumeBody(nsresult aStatus, uint32_t aResultLength,
                                       uint8_t* aResult, bool aShuttingDown) {
  AssertIsOnTargetThread();

  // This makes sure that we free the data correctly.
  UniquePtr<uint8_t[], JS::FreePolicy> resultPtr{aResult};

  if (mBodyConsumed) {
    return;
  }
  mBodyConsumed = true;

  MOZ_ASSERT(mConsumePromise);
  RefPtr<Promise> localPromise = std::move(mConsumePromise);

  RefPtr<BodyConsumer> self = this;
  auto autoReleaseObject =
      mozilla::MakeScopeExit([self] { self->ReleaseObject(); });

  if (aShuttingDown) {
    // If shutting down, we don't want to resolve any promise.
    return;
  }

  if (NS_WARN_IF(NS_FAILED(aStatus))) {
    // Per
    // https://streams.spec.whatwg.org/#readablestreamdefaultreader-read-all-bytes
    // Decoding errors should reject with a TypeError
    if (aStatus == NS_ERROR_INVALID_CONTENT_ENCODING) {
      localPromise->MaybeRejectWithTypeError<MSG_DOM_DECODING_FAILED>();
    } else if (aStatus == NS_ERROR_DOM_WRONG_TYPE_ERR) {
      localPromise->MaybeRejectWithTypeError<MSG_FETCH_BODY_WRONG_TYPE>();
    } else if (aStatus == NS_ERROR_NET_PARTIAL_TRANSFER) {
      localPromise->MaybeRejectWithTypeError<MSG_FETCH_PARTIAL>();
    } else {
      localPromise->MaybeReject(NS_ERROR_DOM_ABORT_ERR);
    }

    return;
  }

  // Finish successfully consuming body according to type.
  MOZ_ASSERT(resultPtr);

  AutoJSAPI jsapi;
  if (!jsapi.Init(mGlobal)) {
    localPromise->MaybeReject(NS_ERROR_UNEXPECTED);
    return;
  }

  JSContext* cx = jsapi.cx();
  ErrorResult error;

  switch (mConsumeType) {
    case ConsumeType::ArrayBuffer: {
      JS::Rooted<JSObject*> arrayBuffer(cx);
      BodyUtil::ConsumeArrayBuffer(cx, &arrayBuffer, aResultLength,
                                   std::move(resultPtr), error);
      if (!error.Failed()) {
        JS::Rooted<JS::Value> val(cx, JS::ObjectValue(*arrayBuffer));
        localPromise->MaybeResolve(val);
      }
      break;
    }
    case ConsumeType::Blob: {
      MOZ_CRASH("This should not happen.");
      break;
    }
    case ConsumeType::Bytes: {
      JS::Rooted<JSObject*> bytes(cx);
      BodyUtil::ConsumeBytes(cx, &bytes, aResultLength, std::move(resultPtr),
                             error);
      if (!error.Failed()) {
        JS::Rooted<JS::Value> val(cx, JS::ObjectValue(*bytes));
        localPromise->MaybeResolve(val);
      }
      break;
    }
    case ConsumeType::FormData: {
      nsCString data;
      data.Adopt(reinterpret_cast<char*>(resultPtr.release()), aResultLength);

      RefPtr<dom::FormData> fd = BodyUtil::ConsumeFormData(
          mGlobal, mBodyMimeType, mMixedCaseMimeType, data, error);
      if (!error.Failed()) {
        localPromise->MaybeResolve(fd);
      }
      break;
    }
    case ConsumeType::Text:
      // fall through handles early exit.
    case ConsumeType::JSON: {
      nsString decoded;
      if (NS_SUCCEEDED(
              BodyUtil::ConsumeText(aResultLength, resultPtr.get(), decoded))) {
        if (mConsumeType == ConsumeType::Text) {
          localPromise->MaybeResolve(decoded);
        } else {
          JS::Rooted<JS::Value> json(cx);
          BodyUtil::ConsumeJson(cx, &json, decoded, error);
          if (!error.Failed()) {
            localPromise->MaybeResolve(json);
          }
        }
      };
      break;
    }
    default:
      MOZ_ASSERT_UNREACHABLE("Unexpected consume body type");
  }

  error.WouldReportJSException();
  if (error.Failed()) {
    localPromise->MaybeReject(std::move(error));
  }
}

void BodyConsumer::ContinueConsumeBlobBody(BlobImpl* aBlobImpl,
                                           bool aShuttingDown) {
  AssertIsOnTargetThread();
  MOZ_ASSERT(mConsumeType == ConsumeType::Blob);

  if (mBodyConsumed) {
    return;
  }
  mBodyConsumed = true;

  MOZ_ASSERT(mConsumePromise);
  RefPtr<Promise> localPromise = std::move(mConsumePromise);

  if (!aShuttingDown) {
    RefPtr<dom::Blob> blob = dom::Blob::Create(mGlobal, aBlobImpl);
    if (NS_WARN_IF(!blob)) {
      localPromise->MaybeReject(NS_ERROR_FAILURE);
      return;
    }

    localPromise->MaybeResolve(blob);
  }

  ReleaseObject();
}

void BodyConsumer::ShutDownMainThreadConsuming() {
  if (!NS_IsMainThread()) {
    RefPtr<BodyConsumer> self = this;

    nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
        "BodyConsumer::ShutDownMainThreadConsuming",
        [self]() { self->ShutDownMainThreadConsuming(); });

    mMainThreadEventTarget->Dispatch(r.forget(), NS_DISPATCH_NORMAL);
    return;
  }

  // We need this because maybe, mConsumeBodyPump has not been created yet. We
  // must be sure that we don't try to do it.
  mShuttingDown = true;

  if (mConsumeBodyPump) {
    mConsumeBodyPump->CancelWithReason(
        NS_BINDING_ABORTED, "BodyConsumer::ShutDownMainThreadConsuming"_ns);
    mConsumeBodyPump = nullptr;
  }
}

void BodyConsumer::MaybeAbortConsumption() {
  AssertIsOnMainThread();

  ContinueConsumeBody(NS_BINDING_ABORTED, 0, nullptr);
}

void BodyConsumer::RunAbortAlgorithm() {
  AssertIsOnTargetThread();
  ShutDownMainThreadConsuming();
  ContinueConsumeBody(NS_ERROR_DOM_ABORT_ERR, 0, nullptr);
}

NS_IMPL_ADDREF(BodyConsumer)
NS_IMPL_RELEASE(BodyConsumer)
NS_INTERFACE_TABLE_HEAD(BodyConsumer)
  NS_INTERFACE_TABLE_BEGIN
    NS_INTERFACE_TABLE_ENTRY_AMBIGUOUS(BodyConsumer, nsISupports,
                                       GlobalTeardownObserver)
  NS_INTERFACE_TABLE_END
NS_INTERFACE_TABLE_TAIL

}  // namespace mozilla::dom

quality100%

¤ Dauer der Verarbeitung: 0.19 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.