diff options
Diffstat (limited to 'dom/base/BodyConsumer.cpp')
| -rw-r--r-- | dom/base/BodyConsumer.cpp | 823 |
1 files changed, 823 insertions, 0 deletions
diff --git a/dom/base/BodyConsumer.cpp b/dom/base/BodyConsumer.cpp new file mode 100644 index 0000000000..8d271b1c05 --- /dev/null +++ b/dom/base/BodyConsumer.cpp @@ -0,0 +1,823 @@ +/* -*- 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 "nsComponentManagerUtils.h" +#include "nsIFile.h" +#include "nsIThreadRetargetableRequest.h" +#include "nsIStreamLoader.h" +#include "nsNetUtil.h" +#include "nsProxyRelease.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(aWorkerPrivate), + 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(aWorkerPrivate), + 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()) { + 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(aWorkerPrivate), + 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(aWorkerPrivate), + 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()) { + // 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())) { + 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, nsIEventTarget* aMainThreadEventTarget, + nsIInputStream* aBodyStream, AbortSignalImpl* aSignalImpl, + ConsumeType aType, const nsACString& aBodyBlobURISpec, + const nsAString& aBodyLocalPath, const nsACString& aBodyMimeType, + 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, 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->mShuttingDown = true; + consumer->ReleaseObject(); + consumer->ShutDownMainThreadConsuming(); + }); + if (NS_WARN_IF(!strongWorkerRef)) { + aRv.Throw(NS_ERROR_FAILURE); + return nullptr; + } + + workerRef = new ThreadSafeWorkerRef(strongWorkerRef); + } else { + nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService(); + if (NS_WARN_IF(!os)) { + aRv.Throw(NS_ERROR_FAILURE); + return nullptr; + } + + aRv = os->AddObserver(consumer, DOM_WINDOW_DESTROYED_TOPIC, true); + if (NS_WARN_IF(aRv.Failed())) { + return nullptr; + } + + aRv = os->AddObserver(consumer, DOM_WINDOW_FROZEN_TOPIC, true); + if (NS_WARN_IF(aRv.Failed())) { + return nullptr; + } + } + + 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()) { + nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService(); + if (os) { + os->RemoveObserver(this, DOM_WINDOW_DESTROYED_TOPIC); + os->RemoveObserver(this, DOM_WINDOW_FROZEN_TOPIC); + } + } + + mGlobal = nullptr; + + Unfollow(); +} + +BodyConsumer::BodyConsumer( + nsIEventTarget* aMainThreadEventTarget, nsIGlobalObject* aGlobalObject, + nsIInputStream* aBodyStream, Promise* aPromise, ConsumeType aType, + const nsACString& aBodyBlobURISpec, const nsAString& aBodyLocalPath, + const nsACString& aBodyMimeType, + MutableBlobStorage::MutableBlobStorageType aBlobStorageType) + : mTargetThread(NS_GetCurrentThread()), + mMainThreadEventTarget(aMainThreadEventTarget), + mBodyStream(aBodyStream), + mBlobStorageType(aBlobStorageType), + mBodyMimeType(aBodyMimeType), + 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) 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) 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; + } + + nsresult rv; + nsCOMPtr<nsIFile> file = do_CreateInstance("@mozilla.org/file/local;1", &rv); + if (NS_FAILED(rv)) { + return rv; + } + + rv = file->InitWithPath(mBodyLocalPath); + NS_ENSURE_SUCCESS(rv, rv); + + bool exists; + rv = file->Exists(&exists); + NS_ENSURE_SUCCESS(rv, rv); + if (!exists) { + return NS_ERROR_FILE_NOT_FOUND; + } + + bool isDir; + rv = file->IsDirectory(&isDir); + NS_ENSURE_SUCCESS(rv, rv); + 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 == CONSUME_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 == CONSUME_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); + rv = rr->RetargetDeliveryTo(sts); + 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()) { + return; + } + } else { + RefPtr<ContinueConsumeBodyRunnable> r = new ContinueConsumeBodyRunnable( + this, aWorkerRef->Private(), NS_ERROR_DOM_ABORT_ERR, 0, nullptr); + + if (r->Dispatch()) { + 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()); +} + +/* + * 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. + auto autoFree = mozilla::MakeScopeExit([&] { free(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://fetch.spec.whatwg.org/#concept-read-all-bytes-from-readablestream + // Decoding errors should reject with a TypeError + if (aStatus == NS_ERROR_INVALID_CONTENT_ENCODING) { + localPromise->MaybeRejectWithTypeError<MSG_DOM_DECODING_FAILED>(); + } else { + localPromise->MaybeReject(NS_ERROR_DOM_ABORT_ERR); + } + } + + // Don't warn here since we warned above. + if (NS_FAILED(aStatus)) { + return; + } + + // Finish successfully consuming body according to type. + MOZ_ASSERT(aResult); + + AutoJSAPI jsapi; + if (!jsapi.Init(mGlobal)) { + localPromise->MaybeReject(NS_ERROR_UNEXPECTED); + return; + } + + JSContext* cx = jsapi.cx(); + ErrorResult error; + + switch (mConsumeType) { + case CONSUME_ARRAYBUFFER: { + JS::Rooted<JSObject*> arrayBuffer(cx); + BodyUtil::ConsumeArrayBuffer(cx, &arrayBuffer, aResultLength, aResult, + error); + + if (!error.Failed()) { + JS::Rooted<JS::Value> val(cx); + val.setObjectOrNull(arrayBuffer); + + localPromise->MaybeResolve(val); + // ArrayBuffer takes over ownership. + aResult = nullptr; + } + break; + } + case CONSUME_BLOB: { + MOZ_CRASH("This should not happen."); + break; + } + case CONSUME_FORMDATA: { + nsCString data; + data.Adopt(reinterpret_cast<char*>(aResult), aResultLength); + aResult = nullptr; + + RefPtr<dom::FormData> fd = + BodyUtil::ConsumeFormData(mGlobal, mBodyMimeType, data, error); + if (!error.Failed()) { + localPromise->MaybeResolve(fd); + } + break; + } + case CONSUME_TEXT: + // fall through handles early exit. + case CONSUME_JSON: { + nsString decoded; + if (NS_SUCCEEDED( + BodyUtil::ConsumeText(aResultLength, aResult, decoded))) { + if (mConsumeType == CONSUME_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 == CONSUME_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->Cancel(NS_BINDING_ABORTED); + mConsumeBodyPump = nullptr; + } +} + +NS_IMETHODIMP BodyConsumer::Observe(nsISupports* aSubject, const char* aTopic, + const char16_t* aData) { + AssertIsOnMainThread(); + + MOZ_ASSERT((strcmp(aTopic, DOM_WINDOW_FROZEN_TOPIC) == 0) || + (strcmp(aTopic, DOM_WINDOW_DESTROYED_TOPIC) == 0)); + + nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(mGlobal); + if (SameCOMIdentity(aSubject, window)) { + ContinueConsumeBody(NS_BINDING_ABORTED, 0, nullptr); + } + + return NS_OK; +} + +void BodyConsumer::RunAbortAlgorithm() { + AssertIsOnTargetThread(); + ShutDownMainThreadConsuming(); + ContinueConsumeBody(NS_ERROR_DOM_ABORT_ERR, 0, nullptr); +} + +NS_IMPL_ISUPPORTS(BodyConsumer, nsIObserver, nsISupportsWeakReference) + +} // namespace mozilla::dom |