block_header.hpp

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#pragma once
#include <sysio/chain/block_timestamp.hpp>
#include <sysio/chain/producer_schedule.hpp>
#include <sysio/chain/protocol_feature_activation.hpp>
#include <sysio/chain/s_root_extension.hpp>
#include <type_traits>
 
namespace sysio { namespace chain {
 
   namespace detail {
      template<typename... Ts>
      struct block_header_extension_types {
         using block_header_extension_t = std::variant< Ts... >;
         using decompose_t = decompose< Ts... >;
      };
   }
 
   using block_header_extension_types = detail::block_header_extension_types<
      protocol_feature_activation, // 0
      producer_schedule_change_extension, // 1
      s_root_extension // 2 out new acceptable type 
   >;
 
   using block_header_extension = block_header_extension_types::block_header_extension_t;
 
   struct block_header
   {
      block_timestamp_type             timestamp;
      account_name                     producer;
 
      uint16_t                         confirmed = 1;
 
      block_id_type                    previous;
 
      checksum256_type                 transaction_mroot; 
      checksum256_type                 action_mroot; 
 
      using new_producers_type = std::optional<legacy::producer_schedule_type>;
 
      uint32_t                          schedule_version = 0;
      new_producers_type                new_producers;
      extensions_type                   header_extensions;
 
 
      block_header() = default;
 
      digest_type       digest()const;
      block_id_type     calculate_id() const;
      uint32_t          block_num() const { return num_from_id(previous) + 1; }
      static uint32_t   num_from_id(const block_id_type& id);
 
      flat_multimap<uint16_t, block_header_extension> validate_and_extract_header_extensions()const;
   };
 
 
   struct signed_block_header : public block_header
   {
      signature_type    producer_signature;
   };
 
} } 
 
FC_REFLECT(sysio::chain::block_header,
           (timestamp)(producer)(confirmed)(previous)
           (transaction_mroot)(action_mroot)
           (schedule_version)(new_producers)(header_extensions))
 
FC_REFLECT_DERIVED(sysio::chain::signed_block_header, (sysio::chain::block_header), (producer_signature))