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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#ifndef mozilla_dom_FetchConsumer_h
#define mozilla_dom_FetchConsumer_h
#include "Fetch.h"
#include "nsIInputStream.h"
#include "nsIObserver.h"
#include "nsWeakReference.h"
#include "mozilla/dom/AbortSignal.h"
#include "mozilla/dom/MutableBlobStorage.h"
class nsIThread;
class nsIInputStreamPump;
namespace mozilla {
namespace dom {
class Promise;
namespace workers {
class WorkerPrivate;
class WorkerHolder;
}
template <class Derived> class FetchBody;
// FetchBody is not thread-safe but we need to move it around threads.
// In order to keep it alive all the time, we use a WorkerHolder, if created on
// workers, plus a this consumer.
template <class Derived>
class FetchBodyConsumer final : public nsIObserver
, public nsSupportsWeakReference
, public AbortSignal::Follower
{
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIOBSERVER
static already_AddRefed<Promise>
Create(nsIGlobalObject* aGlobal,
FetchBody<Derived>* aBody,
AbortSignal* aSignal,
FetchConsumeType aType,
ErrorResult& aRv);
void
ReleaseObject();
void
BeginConsumeBodyMainThread();
void
ContinueConsumeBody(nsresult aStatus, uint32_t aLength, uint8_t* aResult);
void
ContinueConsumeBlobBody(BlobImpl* aBlobImpl);
void
ShutDownMainThreadConsuming();
workers::WorkerPrivate*
GetWorkerPrivate() const
{
return mWorkerPrivate;
}
void
NullifyConsumeBodyPump()
{
mShuttingDown = true;
mConsumeBodyPump = nullptr;
}
// Override AbortSignal::Follower::Aborted
void Aborted() override;
private:
FetchBodyConsumer(nsIGlobalObject* aGlobalObject,
workers::WorkerPrivate* aWorkerPrivate,
FetchBody<Derived>* aBody,
nsIInputStream* aBodyStream,
Promise* aPromise,
FetchConsumeType aType);
~FetchBodyConsumer();
void
AssertIsOnTargetThread() const;
bool
RegisterWorkerHolder();
nsCOMPtr<nsIThread> mTargetThread;
#ifdef DEBUG
// This is used only to check if the body has been correctly consumed.
RefPtr<FetchBody<Derived>> mBody;
#endif
nsCOMPtr<nsIInputStream> mBodyStream;
MutableBlobStorage::MutableBlobStorageType mBlobStorageType;
nsCString mBodyMimeType;
// Set when consuming the body is attempted on a worker.
// Unset when consumption is done/aborted.
// This WorkerHolder keeps alive the consumer via a cycle.
UniquePtr<workers::WorkerHolder> mWorkerHolder;
nsCOMPtr<nsIGlobalObject> mGlobal;
// Always set whenever the FetchBodyConsumer is created on the worker thread.
workers::WorkerPrivate* mWorkerPrivate;
// Touched on the main-thread only.
nsCOMPtr<nsIInputStreamPump> mConsumeBodyPump;
// Only ever set once, always on target thread.
FetchConsumeType mConsumeType;
RefPtr<Promise> mConsumePromise;
// touched only on the target thread.
bool mBodyConsumed;
// touched only on the main-thread.
bool mShuttingDown;
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_FetchConsumer_h
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