Add m-esr52 at 52.6.0

1 files changed, 705 insertions, 0 deletions

diff --git a/dom/fetch/FetchConsumer.cpp b/dom/fetch/FetchConsumer.cpp
new file mode 100644
index 000000000..42dfcbaba
--- /dev/null
+++ b/dom/fetch/FetchConsumer.cpp
@@ -0,0 +1,705 @@
+/* -*- 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 "Fetch.h"
+#include "FetchConsumer.h"
+
+#include "nsIInputStreamPump.h"
+#include "nsProxyRelease.h"
+#include "WorkerPrivate.h"
+#include "WorkerRunnable.h"
+#include "WorkerScope.h"
+#include "Workers.h"
+
+namespace mozilla {
+namespace dom {
+
+using namespace workers;
+
+namespace {
+
+template <class Derived>
+class FetchBodyWorkerHolder final : public workers::WorkerHolder
+{
+  RefPtr<FetchBodyConsumer<Derived>> mConsumer;
+  bool mWasNotified;
+
+public:
+  explicit FetchBodyWorkerHolder(FetchBodyConsumer<Derived>* aConsumer)
+    : mConsumer(aConsumer)
+    , mWasNotified(false)
+  {
+    MOZ_ASSERT(aConsumer);
+  }
+
+  ~FetchBodyWorkerHolder() = default;
+
+  bool Notify(workers::Status aStatus) override
+  {
+    MOZ_ASSERT(aStatus > workers::Running);
+    if (!mWasNotified) {
+      mWasNotified = true;
+      mConsumer->ShutDownMainThreadConsuming();
+    }
+
+    return true;
+  }
+};
+
+template <class Derived>
+class BeginConsumeBodyRunnable final : public Runnable
+{
+  RefPtr<FetchBodyConsumer<Derived>> mFetchBodyConsumer;
+
+public:
+  explicit BeginConsumeBodyRunnable(FetchBodyConsumer<Derived>* aConsumer)
+    : mFetchBodyConsumer(aConsumer)
+  { }
+
+  NS_IMETHOD
+  Run() override
+  {
+    mFetchBodyConsumer->BeginConsumeBodyMainThread();
+    return NS_OK;
+  }
+};
+
+/*
+ * Called on successfully reading the complete stream.
+ */
+template <class Derived>
+class ContinueConsumeBodyRunnable final : public MainThreadWorkerRunnable
+{
+  RefPtr<FetchBodyConsumer<Derived>> mFetchBodyConsumer;
+  nsresult mStatus;
+  uint32_t mLength;
+  uint8_t* mResult;
+
+public:
+  ContinueConsumeBodyRunnable(FetchBodyConsumer<Derived>* aFetchBodyConsumer,
+                              nsresult aStatus, uint32_t aLength,
+                              uint8_t* aResult)
+    : MainThreadWorkerRunnable(aFetchBodyConsumer->GetWorkerPrivate())
+    , mFetchBodyConsumer(aFetchBodyConsumer)
+    , mStatus(aStatus)
+    , mLength(aLength)
+    , mResult(aResult)
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+  }
+
+  bool
+  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
+  {
+    mFetchBodyConsumer->ContinueConsumeBody(mStatus, mLength, mResult);
+    return true;
+  }
+};
+
+template <class Derived>
+class FailConsumeBodyWorkerRunnable : public MainThreadWorkerControlRunnable
+{
+  RefPtr<FetchBodyConsumer<Derived>> mBodyConsumer;
+
+public:
+  explicit FailConsumeBodyWorkerRunnable(FetchBodyConsumer<Derived>* aBodyConsumer)
+    : MainThreadWorkerControlRunnable(aBodyConsumer->GetWorkerPrivate())
+    , mBodyConsumer(aBodyConsumer)
+  {
+    AssertIsOnMainThread();
+  }
+
+  bool
+  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
+  {
+    mBodyConsumer->ContinueConsumeBody(NS_ERROR_FAILURE, 0, nullptr);
+    return true;
+  }
+};
+
+/*
+ * In case of failure to create a stream pump or dispatch stream completion to
+ * worker, ensure we cleanup properly. Thread agnostic.
+ */
+template <class Derived>
+class MOZ_STACK_CLASS AutoFailConsumeBody final
+{
+  RefPtr<FetchBodyConsumer<Derived>> mBodyConsumer;
+
+public:
+  explicit AutoFailConsumeBody(FetchBodyConsumer<Derived>* aBodyConsumer)
+    : mBodyConsumer(aBodyConsumer)
+  {}
+
+  ~AutoFailConsumeBody()
+  {
+    AssertIsOnMainThread();
+
+    if (mBodyConsumer) {
+      if (mBodyConsumer->GetWorkerPrivate()) {
+        RefPtr<FailConsumeBodyWorkerRunnable<Derived>> r =
+          new FailConsumeBodyWorkerRunnable<Derived>(mBodyConsumer);
+        if (!r->Dispatch()) {
+          MOZ_CRASH("We are going to leak");
+        }
+      } else {
+        mBodyConsumer->ContinueConsumeBody(NS_ERROR_FAILURE, 0, nullptr);
+      }
+    }
+  }
+
+  void
+  DontFail()
+  {
+    mBodyConsumer = nullptr;
+  }
+};
+
+/*
+ * Called on successfully reading the complete stream for Blob.
+ */
+template <class Derived>
+class ContinueConsumeBlobBodyRunnable final : public MainThreadWorkerRunnable
+{
+  RefPtr<FetchBodyConsumer<Derived>> mFetchBodyConsumer;
+  RefPtr<BlobImpl> mBlobImpl;
+
+public:
+  ContinueConsumeBlobBodyRunnable(FetchBodyConsumer<Derived>* aFetchBodyConsumer,
+                                  BlobImpl* aBlobImpl)
+    : MainThreadWorkerRunnable(aFetchBodyConsumer->GetWorkerPrivate())
+    , mFetchBodyConsumer(aFetchBodyConsumer)
+    , mBlobImpl(aBlobImpl)
+  {
+    MOZ_ASSERT(NS_IsMainThread());
+    MOZ_ASSERT(mBlobImpl);
+  }
+
+  bool
+  WorkerRun(JSContext* aCx, WorkerPrivate* aWorkerPrivate) override
+  {
+    mFetchBodyConsumer->ContinueConsumeBlobBody(mBlobImpl);
+    return true;
+  }
+};
+
+template <class Derived>
+class ConsumeBodyDoneObserver : public nsIStreamLoaderObserver
+                              , public MutableBlobStorageCallback
+{
+  RefPtr<FetchBodyConsumer<Derived>> mFetchBodyConsumer;
+
+public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  explicit ConsumeBodyDoneObserver(FetchBodyConsumer<Derived>* aFetchBodyConsumer)
+    : mFetchBodyConsumer(aFetchBodyConsumer)
+  { }
+
+  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.
+    mFetchBodyConsumer->NullifyConsumeBodyPump();
+
+    uint8_t* nonconstResult = const_cast<uint8_t*>(aResult);
+    if (mFetchBodyConsumer->GetWorkerPrivate()) {
+      RefPtr<ContinueConsumeBodyRunnable<Derived>> r =
+        new ContinueConsumeBodyRunnable<Derived>(mFetchBodyConsumer,
+                                                 aStatus,
+                                                 aResultLength,
+                                                 nonconstResult);
+      if (!r->Dispatch()) {
+        NS_WARNING("Could not dispatch ConsumeBodyRunnable");
+        // Return failure so that aResult is freed.
+        return NS_ERROR_FAILURE;
+      }
+    } else {
+      mFetchBodyConsumer->ContinueConsumeBody(aStatus, aResultLength,
+                                              nonconstResult);
+    }
+
+    // FetchBody is responsible for data.
+    return NS_SUCCESS_ADOPTED_DATA;
+  }
+
+  virtual void BlobStoreCompleted(MutableBlobStorage* aBlobStorage,
+                                  Blob* aBlob,
+                                  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.
+    mFetchBodyConsumer->NullifyConsumeBodyPump();
+
+    MOZ_ASSERT(aBlob);
+
+    if (mFetchBodyConsumer->GetWorkerPrivate()) {
+      RefPtr<ContinueConsumeBlobBodyRunnable<Derived>> r =
+        new ContinueConsumeBlobBodyRunnable<Derived>(mFetchBodyConsumer,
+                                                     aBlob->Impl());
+
+      if (!r->Dispatch()) {
+        NS_WARNING("Could not dispatch ConsumeBlobBodyRunnable");
+        return;
+      }
+    } else {
+      mFetchBodyConsumer->ContinueConsumeBlobBody(aBlob->Impl());
+    }
+  }
+
+private:
+  virtual ~ConsumeBodyDoneObserver()
+  { }
+};
+
+template <class Derived>
+NS_IMPL_ADDREF(ConsumeBodyDoneObserver<Derived>)
+template <class Derived>
+NS_IMPL_RELEASE(ConsumeBodyDoneObserver<Derived>)
+template <class Derived>
+NS_INTERFACE_MAP_BEGIN(ConsumeBodyDoneObserver<Derived>)
+  NS_INTERFACE_MAP_ENTRY(nsIStreamLoaderObserver)
+  NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIStreamLoaderObserver)
+NS_INTERFACE_MAP_END
+
+} // anonymous
+
+template <class Derived>
+/* static */ already_AddRefed<Promise>
+FetchBodyConsumer<Derived>::Create(nsIGlobalObject* aGlobal,
+                                   FetchBody<Derived>* aBody,
+                                   FetchConsumeType aType,
+                                   ErrorResult& aRv)
+{
+  MOZ_ASSERT(aBody);
+
+  nsCOMPtr<nsIInputStream> bodyStream;
+  aBody->DerivedClass()->GetBody(getter_AddRefs(bodyStream));
+  if (!bodyStream) {
+    aRv = NS_NewCStringInputStream(getter_AddRefs(bodyStream), EmptyCString());
+    if (NS_WARN_IF(aRv.Failed())) {
+      return nullptr;
+    }
+  }
+
+  RefPtr<Promise> promise = Promise::Create(aGlobal, aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  WorkerPrivate* workerPrivate = nullptr;
+  if (!NS_IsMainThread()) {
+    workerPrivate = GetCurrentThreadWorkerPrivate();
+    MOZ_ASSERT(workerPrivate);
+  }
+
+  RefPtr<FetchBodyConsumer<Derived>> consumer =
+    new FetchBodyConsumer<Derived>(aGlobal, workerPrivate, aBody, bodyStream,
+                                   promise, aType);
+
+  if (!NS_IsMainThread()) {
+    MOZ_ASSERT(workerPrivate);
+    if (NS_WARN_IF(!consumer->RegisterWorkerHolder())) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return nullptr;
+    }
+  } 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<Derived>(consumer);
+
+  if (workerPrivate) {
+    aRv = workerPrivate->DispatchToMainThread(r.forget());
+  } else {
+    aRv = NS_DispatchToMainThread(r.forget());
+  }
+
+  if (NS_WARN_IF(aRv.Failed())) {
+    return nullptr;
+  }
+
+  return promise.forget();
+}
+
+template <class Derived>
+void
+FetchBodyConsumer<Derived>::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;
+  mWorkerHolder = nullptr;
+
+#ifdef DEBUG
+  mBody = nullptr;
+#endif
+}
+
+template <class Derived>
+FetchBodyConsumer<Derived>::FetchBodyConsumer(nsIGlobalObject* aGlobalObject,
+                                              WorkerPrivate* aWorkerPrivate,
+                                              FetchBody<Derived>* aBody,
+                                              nsIInputStream* aBodyStream,
+                                              Promise* aPromise,
+                                              FetchConsumeType aType)
+  : mTargetThread(NS_GetCurrentThread())
+#ifdef DEBUG
+  , mBody(aBody)
+#endif
+  , mBodyStream(aBodyStream)
+  , mBlobStorageType(MutableBlobStorage::eOnlyInMemory)
+  , mGlobal(aGlobalObject)
+  , mWorkerPrivate(aWorkerPrivate)
+  , mConsumeType(aType)
+  , mConsumePromise(aPromise)
+  , mBodyConsumed(false)
+  , mShuttingDown(false)
+{
+  MOZ_ASSERT(aBody);
+  MOZ_ASSERT(aBodyStream);
+  MOZ_ASSERT(aPromise);
+
+  const mozilla::UniquePtr<mozilla::ipc::PrincipalInfo>& principalInfo =
+    aBody->DerivedClass()->GetPrincipalInfo();
+  // We support temporary file for blobs only if the principal is known and
+  // it's system or content not in private Browsing.
+  if (principalInfo &&
+      (principalInfo->type() == mozilla::ipc::PrincipalInfo::TSystemPrincipalInfo ||
+       (principalInfo->type() == mozilla::ipc::PrincipalInfo::TContentPrincipalInfo &&
+        principalInfo->get_ContentPrincipalInfo().attrs().mPrivateBrowsingId == 0))) {
+    mBlobStorageType = MutableBlobStorage::eCouldBeInTemporaryFile;
+  }
+
+  mBodyMimeType = aBody->MimeType();
+}
+
+template <class Derived>
+FetchBodyConsumer<Derived>::~FetchBodyConsumer()
+{
+}
+
+template <class Derived>
+void
+FetchBodyConsumer<Derived>::AssertIsOnTargetThread() const
+{
+  MOZ_ASSERT(NS_GetCurrentThread() == mTargetThread);
+}
+
+template <class Derived>
+bool
+FetchBodyConsumer<Derived>::RegisterWorkerHolder()
+{
+  MOZ_ASSERT(mWorkerPrivate);
+  mWorkerPrivate->AssertIsOnWorkerThread();
+
+  MOZ_ASSERT(!mWorkerHolder);
+  mWorkerHolder.reset(new FetchBodyWorkerHolder<Derived>(this));
+
+  if (!mWorkerHolder->HoldWorker(mWorkerPrivate, Closing)) {
+    NS_WARNING("Failed to add workerHolder");
+    mWorkerHolder = nullptr;
+    return false;
+  }
+
+  return true;
+}
+
+/*
+ * 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.
+ */
+template <class Derived>
+void
+FetchBodyConsumer<Derived>::BeginConsumeBodyMainThread()
+{
+  AssertIsOnMainThread();
+
+  AutoFailConsumeBody<Derived> autoReject(this);
+
+  if (mShuttingDown) {
+    // We haven't started yet, but we have been terminated. AutoFailConsumeBody
+    // will dispatch a runnable to release resources.
+    return;
+  }
+
+  nsCOMPtr<nsIInputStreamPump> pump;
+  nsresult rv = NS_NewInputStreamPump(getter_AddRefs(pump),
+                                      mBodyStream, -1, -1, 0, 0, false);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return;
+  }
+
+  RefPtr<ConsumeBodyDoneObserver<Derived>> p =
+   new ConsumeBodyDoneObserver<Derived>(this);
+
+  nsCOMPtr<nsIStreamListener> listener;
+  if (mConsumeType == CONSUME_BLOB) {
+    listener = new MutableBlobStreamListener(mBlobStorageType, nullptr,
+                                             mBodyMimeType, p);
+  } 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, nullptr);
+  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 FetchConsumer.
+  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_WARN_IF(NS_FAILED(rv))) {
+      NS_WARNING("Retargeting failed");
+    }
+  }
+}
+
+template <class Derived>
+void
+FetchBodyConsumer<Derived>::ContinueConsumeBody(nsresult aStatus,
+                                                uint32_t aResultLength,
+                                                uint8_t* aResult)
+{
+  AssertIsOnTargetThread();
+
+  if (mBodyConsumed) {
+    return;
+  }
+  mBodyConsumed = true;
+
+  // Just a precaution to ensure ContinueConsumeBody is not called out of
+  // sync with a body read.
+  MOZ_ASSERT(mBody->BodyUsed());
+
+  auto autoFree = mozilla::MakeScopeExit([&] {
+    free(aResult);
+  });
+
+  MOZ_ASSERT(mConsumePromise);
+  RefPtr<Promise> localPromise = mConsumePromise.forget();
+
+  RefPtr<FetchBodyConsumer<Derived>> self = this;
+  auto autoReleaseObject = mozilla::MakeScopeExit([&] {
+    self->ReleaseObject();
+  });
+
+  if (NS_WARN_IF(NS_FAILED(aStatus))) {
+    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(cx, 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(cx, json);
+          }
+        }
+      };
+      break;
+    }
+    default:
+      NS_NOTREACHED("Unexpected consume body type");
+  }
+
+  error.WouldReportJSException();
+  if (error.Failed()) {
+    localPromise->MaybeReject(error);
+  }
+}
+
+template <class Derived>
+void
+FetchBodyConsumer<Derived>::ContinueConsumeBlobBody(BlobImpl* aBlobImpl)
+{
+  AssertIsOnTargetThread();
+  MOZ_ASSERT(mConsumeType == CONSUME_BLOB);
+
+  if (mBodyConsumed) {
+    return;
+  }
+  mBodyConsumed = true;
+
+  // Just a precaution to ensure ContinueConsumeBody is not called out of
+  // sync with a body read.
+  MOZ_ASSERT(mBody->BodyUsed());
+
+  MOZ_ASSERT(mConsumePromise);
+  RefPtr<Promise> localPromise = mConsumePromise.forget();
+
+  RefPtr<dom::Blob> blob = dom::Blob::Create(mGlobal, aBlobImpl);
+  MOZ_ASSERT(blob);
+
+  localPromise->MaybeResolve(blob);
+
+  ReleaseObject();
+}
+
+template <class Derived>
+void
+FetchBodyConsumer<Derived>::ShutDownMainThreadConsuming()
+{
+  if (!NS_IsMainThread()) {
+    RefPtr<FetchBodyConsumer<Derived>> self = this;
+
+    nsCOMPtr<nsIRunnable> r = NS_NewRunnableFunction(
+      [self] () { self->ShutDownMainThreadConsuming(); });
+
+    WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
+    MOZ_ASSERT(workerPrivate);
+    workerPrivate->DispatchToMainThread(r.forget());
+    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;
+  }
+}
+
+template <class Derived>
+NS_IMETHODIMP
+FetchBodyConsumer<Derived>::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;
+}
+
+template <class Derived>
+NS_IMPL_ADDREF(FetchBodyConsumer<Derived>)
+
+template <class Derived>
+NS_IMPL_RELEASE(FetchBodyConsumer<Derived>)
+
+template <class Derived>
+NS_IMPL_QUERY_INTERFACE(FetchBodyConsumer<Derived>,
+                        nsIObserver,
+                        nsISupportsWeakReference)
+
+} // namespace dom
+} // namespace mozilla