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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/core/utils/stream/ResponseStream.h>
#include <aws/core/utils/memory/stl/AWSStringStream.h>
#include <aws/core/utils/logging/LogMacros.h>
#if defined(_GLIBCXX_FULLY_DYNAMIC_STRING) && _GLIBCXX_FULLY_DYNAMIC_STRING == 0 && defined(__ANDROID__)
#include <aws/core/utils/stream/SimpleStreamBuf.h>
using DefaultStreamBufType = Aws::Utils::Stream::SimpleStreamBuf;
#else
using DefaultStreamBufType = Aws::StringBuf;
#endif
using namespace Aws::Utils::Stream;
const int ResponseStream::ResponseStream::xindex = std::ios_base::xalloc();
ResponseStream::ResponseStream(void) :
m_underlyingStream(nullptr)
{
}
ResponseStream::ResponseStream(Aws::IOStream* underlyingStreamToManage) :
m_underlyingStream(underlyingStreamToManage)
{
RegisterStream();
}
ResponseStream::ResponseStream(const Aws::IOStreamFactory& factory) :
m_underlyingStream(factory())
{
RegisterStream();
}
ResponseStream::ResponseStream(ResponseStream&& toMove) : m_underlyingStream(toMove.m_underlyingStream)
{
toMove.DeregisterStream();
toMove.m_underlyingStream = nullptr;
RegisterStream();
}
ResponseStream& ResponseStream::operator=(ResponseStream&& toMove)
{
if(m_underlyingStream == toMove.m_underlyingStream)
{
return *this;
}
ReleaseStream();
toMove.DeregisterStream();
m_underlyingStream = toMove.m_underlyingStream;
toMove.m_underlyingStream = nullptr;
RegisterStream();
return *this;
}
Aws::IOStream& ResponseStream::GetUnderlyingStream() const
{
if (!m_underlyingStream)
{
assert(m_underlyingStream);
AWS_LOGSTREAM_FATAL("ResponseStream", "Unexpected nullptr m_underlyingStream");
static DefaultUnderlyingStream fallbackStream; // we are already in UB, let's just not crash existing apps
return fallbackStream;
}
return *m_underlyingStream;
}
ResponseStream::~ResponseStream()
{
ReleaseStream();
}
void ResponseStream::ReleaseStream()
{
if (m_underlyingStream)
{
DeregisterStream();
Aws::Delete(m_underlyingStream);
}
m_underlyingStream = nullptr;
}
void ResponseStream::RegisterStream()
{
if (m_underlyingStream)
{
ResponseStream* pThat = static_cast<ResponseStream*>(m_underlyingStream->pword(ResponseStream::xindex));
if (pThat != nullptr)
{
// callback is already registered
assert(pThat != this); // Underlying stream must not be owned by more than one ResponseStream
}
else
{
m_underlyingStream->register_callback(ResponseStream::StreamCallback, ResponseStream::xindex);
}
m_underlyingStream->pword(ResponseStream::xindex) = this;
}
}
void ResponseStream::DeregisterStream()
{
if (m_underlyingStream)
{
assert(static_cast<ResponseStream*>(m_underlyingStream->pword(ResponseStream::xindex)) == this); // Attempt to deregister another ResponseStream's stream
m_underlyingStream->pword(ResponseStream::xindex) = nullptr; // ios does not support deregister, so just erasing the context
}
}
void ResponseStream::StreamCallback(Aws::IOStream::event evt, std::ios_base& stream, int idx)
{
if (evt == std::ios_base::erase_event)
{
ResponseStream* pThis = static_cast<ResponseStream*>(stream.pword(idx));
if (pThis)
{
// m_underlyingStream is being destructed, let's avoid double destruction or having a dangling pointer
pThis->m_underlyingStream = nullptr;
}
}
}
static const char *DEFAULT_STREAM_TAG = "DefaultUnderlyingStream";
DefaultUnderlyingStream::DefaultUnderlyingStream() :
Base( Aws::New< DefaultStreamBufType >( DEFAULT_STREAM_TAG ) )
{}
DefaultUnderlyingStream::DefaultUnderlyingStream(Aws::UniquePtr<std::streambuf> buf) :
Base(buf.release())
{}
DefaultUnderlyingStream::~DefaultUnderlyingStream()
{
if( rdbuf() )
{
Aws::Delete( rdbuf() );
}
}
static const char* RESPONSE_STREAM_FACTORY_TAG = "ResponseStreamFactory";
Aws::IOStream* Aws::Utils::Stream::DefaultResponseStreamFactoryMethod()
{
return Aws::New<Aws::Utils::Stream::DefaultUnderlyingStream>(RESPONSE_STREAM_FACTORY_TAG);
}
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