text: // Copyright (c) 2018, Triton Developers
  // 
  // All rights reserved.
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  // Redistribution and use in source and binary forms, with or without modification, are
  // permitted provided that the following conditions are met:
  // 
  // 1. Redistributions of source code must retain the above copyright notice, this list of
  //    conditions and the following disclaimer.
  // 
  // 2. Redistributions in binary form must reproduce the above copyright notice, this list
  //    of conditions and the following disclaimer in the documentation and/or other
  //    materials provided with the distribution.
  // 
  // 3. Neither the name of the copyright holder nor the names of its contributors may be
  //    used to endorse or promote products derived from this software without specific
  //    prior written permission.
  // 
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
  // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
  // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #pragma once
  
  #include <string>
  #include <vector>
  #include <lmdb.h>
  #include "wipeable_string.h"
  #include "crypto/crypto.h"
  #include "cryptonote_basic/cryptonote_basic.h"
  
  namespace tools
  {
    class ringdb
    {
    public:
      ringdb(std::string filename, const std::string &genesis);
      void close();
      ~ringdb();
  
      bool add_rings(const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx);
      bool remove_rings(const crypto::chacha_key &chacha_key, const cryptonote::transaction_prefix &tx);
      bool get_ring(const crypto::chacha_key &chacha_key, const crypto::key_image &key_image, std::vector<uint64_t> &outs);
      bool set_ring(const crypto::chacha_key &chacha_key, const crypto::key_image &key_image, const std::vector<uint64_t> &outs, bool relative);
  
      bool blackball(const std::pair<uint64_t, uint64_t> &output);
      bool blackball(const std::vector<std::pair<uint64_t, uint64_t>> &outputs);
      bool unblackball(const std::pair<uint64_t, uint64_t> &output);
      bool blackballed(const std::pair<uint64_t, uint64_t> &output);
      bool clear_blackballs();
  
    private:
      bool blackball_worker(const std::vector<std::pair<uint64_t, uint64_t>> &outputs, int op);
  
    private:
      std::string filename;
      MDB_env *env;
      MDB_dbi dbi_rings;
      MDB_dbi dbi_blackballs;
    };
  }
  