util/serialization/util.hpp

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// Copyright (c) 2021 MIT Digital Currency Initiative,
//                    Federal Reserve Bank of Boston
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#ifndef OPENCBDC_TX_SRC_SERIALIZATION_UTIL_H_
#define OPENCBDC_TX_SRC_SERIALIZATION_UTIL_H_
 
#include "buffer_serializer.hpp"
#include "size_serializer.hpp"
 
#include <memory>
 
namespace cbdc {
    template<typename T>
    auto serialized_size(const T& obj) -> size_t {
        auto ser = size_serializer();
        ser << obj;
        return ser.size();
    }
 
    template<typename T, typename B = buffer>
    auto make_buffer(const T& obj)
        -> std::enable_if_t<std::is_same_v<B, buffer>, cbdc::buffer> {
        auto sz = serialized_size(obj);
        auto pkt = cbdc::buffer();
        pkt.extend(sz);
        auto ser = cbdc::buffer_serializer(pkt);
        ser << obj;
        return pkt;
    }
 
    template<typename T>
    auto make_shared_buffer(const T& obj) -> std::shared_ptr<cbdc::buffer> {
        auto sz = serialized_size(obj);
        auto buf = std::make_shared<cbdc::buffer>();
        buf->extend(sz);
        auto ser = cbdc::buffer_serializer(*buf);
        ser << obj;
        return buf;
    }
 
    template<typename T>
    auto from_buffer(cbdc::buffer& buf) -> std::optional<T> {
        auto deser = cbdc::buffer_serializer(buf);
        T ret{};
        if(!(deser >> ret)) {
            return std::nullopt;
        }
        return ret;
    }
}
 
#endif // OPENCBDC_TX_SRC_SERIALIZATION_UTIL_H_