// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

#pragma once

#include <aws/core/utils/memory/stl/AWSStreamFwd.h>

#include <aws/core/utils/stream/PreallocatedStreamBuf.h>

namespace doris {

// A non-copying iostream.

// See https://stackoverflow.com/questions/35322033/aws-c-sdk-uploadpart-times-out

// https://stackoverflow.com/questions/13059091/creating-an-input-stream-from-constant-memory

class StringViewStream : Aws::Utils::Stream::PreallocatedStreamBuf, public std::iostream {

public:

    StringViewStream(const void* buf, int64_t nbytes)

            : Aws::Utils::Stream::PreallocatedStreamBuf(

                      reinterpret_cast<unsigned char*>(const_cast<void*>(buf)),

                      static_cast<size_t>(nbytes)),

              std::iostream(this) {}

};

// By default, the AWS SDK reads object data into an auto-growing StringStream.

// To avoid copies, read directly into our preallocated buffer instead.

// See https://github.com/aws/aws-sdk-cpp/issues/64 for an alternative but

// functionally similar recipe.

inline Aws::IOStreamFactory AwsWriteableStreamFactory(void* buf, int64_t nbytes) {

    return [=]() { return Aws::New<StringViewStream>("", buf, nbytes); };

}

} // namespace doris