offchain_storage.hpp

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#ifndef KAGOME_OFFCHAIN_OFFCHAINSTORAGE
#define KAGOME_OFFCHAIN_OFFCHAINSTORAGE

#include <boost/optional.hpp>

#include "common/buffer.hpp"
#include "outcome/outcome.hpp"

namespace kagome::offchain {

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

    virtual outcome::result<void> set(const common::BufferView &key,
                                      common::Buffer value) = 0;

    virtual outcome::result<void> clear(const common::BufferView &key) = 0;

    virtual outcome::result<bool> compare_and_set(
        const common::BufferView &key,
        const std::optional<common::BufferView> &expected,
        common::Buffer value) = 0;

    virtual outcome::result<common::Buffer> get(
        const common::BufferView &key) = 0;
  };

}  // namespace kagome::offchain

#endif  // KAGOME_OFFCHAIN_OFFCHAINSTORAGE