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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_cache_ReadStream_h
#define mozilla_dom_cache_ReadStream_h
#include "mozilla/RefPtr.h"
#include "mozilla/dom/SafeRefPtr.h"
#include "mozilla/ipc/FileDescriptor.h"
#include "nsCOMPtr.h"
#include "nsID.h"
#include "nsIInputStream.h"
#include "nsISupportsImpl.h"
#include "nsTArrayForwardDeclare.h"
namespace mozilla {
class ErrorResult;
namespace dom::cache {
class CacheReadStream;
class PCacheStreamControlParent;
// IID for the dom::cache::ReadStream interface
#define NS_DOM_CACHE_READSTREAM_IID \
{0x8e5da7c9, 0x0940, 0x4f1d, {0x97, 0x25, 0x5c, 0x59, 0x38, 0xdd, 0xb9, 0x9f}}
// Custom stream class for Request and Response bodies being read from
// a Cache. The main purpose of this class is to report back to the
// Cache's Manager when the stream is closed. This allows the Cache to
// accurately determine when the underlying body file can be deleted,
// etc.
//
// The ReadStream class also provides us with a convenient QI'able
// interface that we can use to pass additional meta-data with the
// stream channel. For example, Cache.put() can detect that the content
// script is passing a Cache-originated-stream back into the Cache
// again. This enables certain optimizations.
class ReadStream final : public nsIInputStream {
public:
// Interface that lets the StreamControl classes interact with
// our private inner stream.
class Controllable : public AtomicSafeRefCounted<Controllable> {
public:
virtual ~Controllable() = default;
// Closes the stream, notifies the stream control, and then forgets
// the stream control.
virtual void CloseStream() = 0;
// Closes the stream and then forgets the stream control. Does not
// notify.
virtual void CloseStreamWithoutReporting() = 0;
virtual bool HasEverBeenRead() const = 0;
MOZ_DECLARE_REFCOUNTED_TYPENAME(ReadStream::Controllable);
};
static already_AddRefed<ReadStream> Create(
const Maybe<CacheReadStream>& aMaybeReadStream);
static already_AddRefed<ReadStream> Create(
const CacheReadStream& aReadStream);
static already_AddRefed<ReadStream> Create(
PCacheStreamControlParent* aControl, const nsID& aId,
nsIInputStream* aStream);
void Serialize(Maybe<CacheReadStream>* aReadStreamOut, ErrorResult& aRv);
void Serialize(CacheReadStream* aReadStreamOut, ErrorResult& aRv);
private:
class Inner;
~ReadStream();
// Hold a strong ref to an inner class that actually implements the
// majority of the stream logic. Before releasing this ref the outer
// ReadStream guarantees it will call Close() on the inner stream.
// This is essential for the inner stream to avoid dealing with the
// implicit close that can happen when a stream is destroyed.
SafeRefPtr<ReadStream::Inner> mInner;
public:
explicit ReadStream(SafeRefPtr<ReadStream::Inner> aInner);
NS_INLINE_DECL_STATIC_IID(NS_DOM_CACHE_READSTREAM_IID);
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIINPUTSTREAM
};
} // namespace dom::cache
} // namespace mozilla
#endif // mozilla_dom_cache_ReadStream_h
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