File: FetchStream.h

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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_dom_FetchStream_h
#define mozilla_dom_FetchStream_h

#include "Fetch.h"
#include "jsapi.h"
#include "nsIAsyncInputStream.h"
#include "nsIObserver.h"
#include "nsISupportsImpl.h"
#include "nsWeakReference.h"

class nsIGlobalObject;

class nsIInputStream;

namespace mozilla {
namespace dom {

class FetchStreamHolder;
class WorkerHolder;

class FetchStream final : public nsIInputStreamCallback,
                          public nsIObserver,
                          public nsSupportsWeakReference {
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIINPUTSTREAMCALLBACK
  NS_DECL_NSIOBSERVER

  static void Create(JSContext* aCx, FetchStreamHolder* aStreamHolder,
                     nsIGlobalObject* aGlobal, nsIInputStream* aInputStream,
                     JS::MutableHandle<JSObject*> aStream, ErrorResult& aRv);

  void Close();

  static nsresult RetrieveInputStream(void* aUnderlyingReadableStreamSource,
                                      nsIInputStream** aInputStream);

 private:
  FetchStream(nsIGlobalObject* aGlobal, FetchStreamHolder* aStreamHolder,
              nsIInputStream* aInputStream);
  ~FetchStream();

  static void RequestDataCallback(JSContext* aCx, JS::HandleObject aStream,
                                  void* aUnderlyingSource, uint8_t aFlags,
                                  size_t aDesiredSize);

  static void WriteIntoReadRequestCallback(
      JSContext* aCx, JS::HandleObject aStream, void* aUnderlyingSource,
      uint8_t aFlags, void* aBuffer, size_t aLength, size_t* aByteWritten);

  static JS::Value CancelCallback(JSContext* aCx, JS::HandleObject aStream,
                                  void* aUnderlyingSource, uint8_t aFlags,
                                  JS::HandleValue aReason);

  static void ClosedCallback(JSContext* aCx, JS::HandleObject aStream,
                             void* aUnderlyingSource, uint8_t aFlags);

  static void ErroredCallback(JSContext* aCx, JS::HandleObject aStream,
                              void* aUnderlyingSource, uint8_t aFlags,
                              JS::HandleValue reason);

  static void FinalizeCallback(void* aUnderlyingSource, uint8_t aFlags);

  void ErrorPropagation(JSContext* aCx, JS::HandleObject aStream, nsresult aRv);

  void CloseAndReleaseObjects(JSContext* aCx, JS::HandleObject aSteam);

  void ReleaseObjects();

  // Common methods

  enum State {
    // RequestDataCallback has not been called yet. We haven't started to read
    // data from the stream yet.
    eWaiting,

    // We are reading data in a separate I/O thread.
    eReading,

    // We are ready to write something in the JS Buffer.
    eWriting,

    // After a writing, we want to check if the stream is closed. After the
    // check, we go back to eWaiting. If a reading request happens in the
    // meantime, we move to eReading state.
    eChecking,

    // Operation completed.
    eClosed,
  };

  // Touched only on the target thread.
  State mState;

  nsCOMPtr<nsIGlobalObject> mGlobal;
  RefPtr<FetchStreamHolder> mStreamHolder;
  nsCOMPtr<nsIEventTarget> mOwningEventTarget;

  // This is the original inputStream received during the CTOR. It will be
  // converted into an nsIAsyncInputStream and stored into mInputStream at the
  // first use.
  nsCOMPtr<nsIInputStream> mOriginalInputStream;
  nsCOMPtr<nsIAsyncInputStream> mInputStream;

  UniquePtr<WorkerHolder> mWorkerHolder;
};

}  // namespace dom
}  // namespace mozilla

#endif  // mozilla_dom_FetchStream_h