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/* -*- 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/. */
#ifndef mozilla_RemoteLazyInputStream_h
#define mozilla_RemoteLazyInputStream_h
#include "mozilla/Mutex.h"
#include "mozIRemoteLazyInputStream.h"
#include "nsIAsyncInputStream.h"
#include "nsICloneableInputStream.h"
#include "nsIFileStreams.h"
#include "nsIIPCSerializableInputStream.h"
#include "nsIInputStreamLength.h"
#include "nsCOMPtr.h"
namespace mozilla {
class RemoteLazyInputStreamChild;
class RemoteLazyInputStream final : public nsIAsyncInputStream,
public nsIInputStreamCallback,
public nsICloneableInputStreamWithRange,
public nsIIPCSerializableInputStream,
public nsIAsyncFileMetadata,
public nsIInputStreamLength,
public nsIAsyncInputStreamLength,
public mozIRemoteLazyInputStream {
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIINPUTSTREAM
NS_DECL_NSIASYNCINPUTSTREAM
NS_DECL_NSIINPUTSTREAMCALLBACK
NS_DECL_NSICLONEABLEINPUTSTREAM
NS_DECL_NSICLONEABLEINPUTSTREAMWITHRANGE
NS_DECL_NSIIPCSERIALIZABLEINPUTSTREAM
NS_DECL_NSIFILEMETADATA
NS_DECL_NSIASYNCFILEMETADATA
NS_DECL_NSIINPUTSTREAMLENGTH
NS_DECL_NSIASYNCINPUTSTREAMLENGTH
explicit RemoteLazyInputStream(RemoteLazyInputStreamChild* aActor);
void StreamReady(already_AddRefed<nsIInputStream> aInputStream);
void LengthReady(int64_t aLength);
// mozIRemoteLazyInputStream
NS_IMETHOD_(nsIInputStream*) GetInternalStream() override {
if (mRemoteStream) {
return mRemoteStream;
}
if (mAsyncRemoteStream) {
return mAsyncRemoteStream;
}
return nullptr;
}
private:
~RemoteLazyInputStream();
nsresult EnsureAsyncRemoteStream(const MutexAutoLock& aProofOfLock);
void InitWithExistingRange(uint64_t aStart, uint64_t aLength,
const MutexAutoLock& aProofOfLock);
RefPtr<RemoteLazyInputStreamChild> mActor;
// This is the list of possible states.
enum {
// The initial state. Only ::Available() can be used without receiving an
// error. The available size is known by the actor.
eInit,
// AsyncWait() has been called for the first time. SendStreamNeeded() has
// been called and we are waiting for the 'real' inputStream.
ePending,
// When the child receives the stream from the parent, we move to this
// state. The received stream is stored in mRemoteStream. From now on, any
// method call will be forwared to mRemoteStream.
eRunning,
// If Close() or CloseWithStatus() is called, we move to this state.
// mRemoveStream is released and any method will return
// NS_BASE_STREAM_CLOSED.
eClosed,
} mState;
uint64_t mStart;
uint64_t mLength;
// Set to true if the stream is used via Read/ReadSegments or Close.
bool mConsumed;
nsCOMPtr<nsIInputStream> mRemoteStream;
nsCOMPtr<nsIAsyncInputStream> mAsyncRemoteStream;
// These 2 values are set only if mState is ePending.
nsCOMPtr<nsIInputStreamCallback> mInputStreamCallback;
nsCOMPtr<nsIEventTarget> mInputStreamCallbackEventTarget;
// These 2 values are set only if mState is ePending.
nsCOMPtr<nsIFileMetadataCallback> mFileMetadataCallback;
nsCOMPtr<nsIEventTarget> mFileMetadataCallbackEventTarget;
// These 2 values are set only when nsIAsyncInputStreamLength::asyncWait() is
// called.
nsCOMPtr<nsIInputStreamLengthCallback> mLengthCallback;
nsCOMPtr<nsIEventTarget> mLengthCallbackEventTarget;
// Any member of this class is protected by mutex because touched on
// multiple threads.
Mutex mMutex;
};
} // namespace mozilla
#endif // mozilla_RemoteLazyInputStream_h
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