block_loader.hpp

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#ifndef IROHA_BLOCK_LOADER_HPP
#define IROHA_BLOCK_LOADER_HPP

#include <memory>
#include <variant>

#include "interfaces/common_objects/types.hpp"
#include "interfaces/iroha_internal/block.hpp"

namespace iroha {
  namespace network {
    class BlockReader {
     public:
      struct iteration_complete {};
      virtual std::variant<
          iteration_complete,
          std::shared_ptr<const shared_model::interface::Block>,
          std::string>
      read() = 0;

      virtual ~BlockReader() = default;
    };

    class BlockLoader {
     public:
      virtual expected::Result<std::unique_ptr<BlockReader>> retrieveBlocks(
          const shared_model::interface::types::HeightType height,
          shared_model::interface::types::PublicKeyHexStringView
              peer_pubkey) = 0;

      virtual iroha::expected::Result<
          std::unique_ptr<shared_model::interface::Block>,
          std::string>
      retrieveBlock(
          shared_model::interface::types::PublicKeyHexStringView peer_pubkey,
          shared_model::interface::types::HeightType block_height) = 0;

      virtual ~BlockLoader() = default;
    };
  }  // namespace network
}  // namespace iroha

#endif  // IROHA_BLOCK_LOADER_HPP