type-message.h

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// Copyright (c) 2025 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#ifndef MP_PROXY_TYPE_MESSAGE_H
#define MP_PROXY_TYPE_MESSAGE_H
 
#include <mp/util.h>
 
namespace mp {
template <typename LocalType, typename Value, typename Output>
void CustomBuildField(TypeList<LocalType>, Priority<2>, InvokeContext& invoke_context, Value&& value, Output&& output,
                      decltype(CustomBuildMessage(invoke_context, value, std::move(output.get())))* enable = nullptr)
{
    CustomBuildMessage(invoke_context, value, std::move(output.init()));
}
 
template <typename LocalType, typename Reader, typename ReadDest>
decltype(auto) CustomReadField(TypeList<LocalType>, Priority<2>, InvokeContext& invoke_context, Reader&& reader,
                               ReadDest&& read_dest,
                               decltype(CustomReadMessage(invoke_context, reader.get(),
                                                          std::declval<LocalType&>()))* enable = nullptr)
{
    return read_dest.update([&](auto& value) { if (reader.has()) CustomReadMessage(invoke_context, reader.get(), value); });
}
 
template <typename Accessor, typename Message>
decltype(auto) MaybeInit(Message&& message, decltype(Accessor::get(message))* enable = nullptr)
{
    return Accessor::init(message);
}
 
template <typename Accessor>
::capnp::Void MaybeInit(...)
{
    return {};
}
 
template <typename Accessor, typename... LocalTypes, typename ServerContext, typename Fn, typename... Args>
auto CustomPassField(TypeList<LocalTypes...>, ServerContext& server_context, Fn&& fn, Args&&... args)
    -> decltype(CustomPassMessage(server_context, MaybeGet<Accessor>(server_context.call_context.getParams()),
                                  MaybeGet<Accessor>(server_context.call_context.getResults()), nullptr))
{
    CustomPassMessage(server_context, MaybeGet<Accessor>(server_context.call_context.getParams()),
                      MaybeInit<Accessor>(server_context.call_context.getResults()),
                      [&](LocalTypes... param) { fn.invoke(server_context, std::forward<Args>(args)..., param...); });
}
} // namespace mp
 
#endif // MP_PROXY_TYPE_MESSAGE_H