block_header_repository.hpp

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#ifndef KAGOME_CORE_BLOCKCHAIN_BLOCK_HEADER_REPOSITORY_HPP
#define KAGOME_CORE_BLOCKCHAIN_BLOCK_HEADER_REPOSITORY_HPP

#include <optional>

#include "common/blob.hpp"
#include "common/visitor.hpp"
#include "outcome/outcome.hpp"
#include "primitives/block_header.hpp"
#include "primitives/block_id.hpp"

namespace kagome::blockchain {

  enum class BlockStatus { InChain, Unknown };

  class BlockHeaderRepository {
   public:
    virtual ~BlockHeaderRepository() = default;

    virtual outcome::result<primitives::BlockNumber> getNumberByHash(
        const common::Hash256 &hash) const = 0;

    virtual outcome::result<common::Hash256> getHashByNumber(
        const primitives::BlockNumber &number) const = 0;

    virtual outcome::result<primitives::BlockHeader> getBlockHeader(
        const primitives::BlockId &id) const = 0;

    virtual outcome::result<kagome::blockchain::BlockStatus> getBlockStatus(
        const primitives::BlockId &id) const = 0;

    outcome::result<primitives::BlockNumber> getNumberById(
        const primitives::BlockId &id) const {
      return visit_in_place(
          id,
          [](const primitives::BlockNumber &n) { return n; },
          [this](const common::Hash256 &hash) {
            return getNumberByHash(hash);
          });
    }

    outcome::result<common::Hash256> getHashById(
        const primitives::BlockId &id) const {
      return visit_in_place(
          id,
          [this](const primitives::BlockNumber &n) {
            return getHashByNumber(n);
          },
          [](const common::Hash256 &hash) { return hash; });
    }
  };

}  // namespace kagome::blockchain

#endif  // KAGOME_CORE_BLOCKCHAIN_BLOCK_HEADER_REPOSITORY_HPP