text: // Copyright (c) 2014-2018, The Monero Project
  // Copyright (c) 2018, SUMOKOIN
  // Copyright (c) 2014-2018, Saronite Project
  // Copyright (c) 2018, Agio Project
  //
  // All rights reserved.
  //
  // 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.
  
  #include <atomic>
  #include <cstdio>
  #include <algorithm>
  #include <fstream>
  
  #include <boost/filesystem.hpp>
  #include "bootstrap_file.h"
  #include "bootstrap_serialization.h"
  #include "cryptonote_core/cryptonote_format_utils.h"
  #include "serialization/binary_utils.h" // dump_binary(), parse_binary()
  #include "serialization/json_utils.h" // dump_json()
  #include "include_base_utils.h"
  #include "blockchain_db/db_types.h"
  
  #include <lmdb.h> // for db flag arguments
  
  #include "fake_core.h"
  
  namespace
  {
  // CONFIG
  bool opt_batch   = true;
  bool opt_verify  = true; // use add_new_block, which does verification before calling add_block
  bool opt_resume  = true;
  bool opt_testnet = true;
  
  // number of blocks per batch transaction
  // adjustable through command-line argument according to available RAM
  #if ARCH_WIDTH != 32
  uint64_t db_batch_size = 20000;
  #else
  // set a lower default batch size, pending possible LMDB issue with large transaction size
  uint64_t db_batch_size = 100;
  #endif
  
  // when verifying, use a smaller default batch size so progress is more
  // frequently saved
  uint64_t db_batch_size_verify = 5000;
  
  std::string refresh_string = "\r                                    \r";
  }
  
  
  
  namespace po = boost::program_options;
  
  using namespace cryptonote;
  using namespace epee;
  
  
  std::string join_set_strings(const std::unordered_set<std::string>& db_types_all, const char* delim)
  {
    std::string result;
    std::ostringstream s;
    std::copy(db_types_all.begin(), db_types_all.end(), std::ostream_iterator<std::string>(s, delim));
    result = s.str();
    if (result.length() > 0)
      result.erase(result.end()-strlen(delim), result.end());
    return result;
  }
  
  // db_type: lmdb, berkeley
  // db_mode: safe, fast, fastest
  int get_db_flags_from_mode(const std::string& db_type, const std::string& db_mode)
  {
    uint64_t BDB_FAST_MODE = 0;
    uint64_t BDB_FASTEST_MODE = 0;
    uint64_t BDB_SAFE_MODE = 0;
  
  #if defined(BERKELEY_DB)
    BDB_FAST_MODE = DB_TXN_WRITE_NOSYNC;
    BDB_FASTEST_MODE = DB_TXN_NOSYNC;
    BDB_SAFE_MODE = DB_TXN_SYNC;
  #endif
  
    int db_flags = 0;
    bool islmdb = db_type == "lmdb";
    if (db_mode == "safe")
      db_flags = islmdb ? MDB_NORDAHEAD : BDB_SAFE_MODE;
    else if (db_mode == "fast")
      db_flags = islmdb ? MDB_NOMETASYNC | MDB_NOSYNC | MDB_NORDAHEAD : BDB_FAST_MODE;
    else if (db_mode == "fastest")
      db_flags = islmdb ? MDB_WRITEMAP | MDB_MAPASYNC | MDB_NORDAHEAD | MDB_NOMETASYNC | MDB_NOSYNC : BDB_FASTEST_MODE;
    return db_flags;
  }
  
  int parse_db_arguments(const std::string& db_arg_str, std::string& db_type, int& db_flags)
  {
    std::vector<std::string> db_args;
    boost::split(db_args, db_arg_str, boost::is_any_of("#"));
    db_type = db_args.front();
    boost::algorithm::trim(db_type);
  
    if (db_args.size() == 1)
    {
      return 0;
    }
    else if (db_args.size() > 2)
    {
      std::cerr << "unrecognized database argument format: " << db_arg_str << ENDL;
      return 1;
    }
  
  #if !defined(BERKELEY_DB)
    if (db_type == "berkeley")
    {
      LOG_ERROR("BerkeleyDB support disabled.");
      return false;
    }
  #endif
  
    std::string db_arg_str2 = db_args[1];
    boost::split(db_args, db_arg_str2, boost::is_any_of(","));
  
    // optionally use a composite mode instead of individual flags
    const std::unordered_set<std::string> db_modes {"safe", "fast", "fastest"};
    std::string db_mode;
    if (db_args.size() == 1)
    {
      if (db_modes.count(db_args[0]) > 0)
      {
        db_mode = db_args[0];
      }
    }
    if (! db_mode.empty())
    {
      db_flags = get_db_flags_from_mode(db_type, db_mode);
    }
    else
    {
      for (auto& it : db_args)
      {
        boost::algorithm::trim(it);
        if (it.empty())
  	continue;
        if (db_type == "lmdb")
        {
  	LOG_PRINT_L1("LMDB flag: " << it);
  	if (it == "nosync")
  	  db_flags |= MDB_NOSYNC;
  	else if (it == "nometasync")
  	  db_flags |= MDB_NOMETASYNC;
  	else if (it == "writemap")
  	  db_flags |= MDB_WRITEMAP;
  	else if (it == "mapasync")
  	  db_flags |= MDB_MAPASYNC;
  	else if (it == "nordahead")
  	  db_flags |= MDB_NORDAHEAD;
  	else
  	{
  	  std::cerr << "unrecognized database flag: " << it << ENDL;
  	  return 1;
  	}
        }
  #if defined(BERKELEY_DB)
        else if (db_type == "berkeley")
        {
  	if (it == "txn_write_nosync")
  	  db_flags = DB_TXN_WRITE_NOSYNC;
  	else if (it == "txn_nosync")
  	  db_flags = DB_TXN_NOSYNC;
  	else if (it == "txn_sync")
  	  db_flags = DB_TXN_SYNC;
  	else
  	{
  	  std::cerr << "unrecognized database flag: " << it << ENDL;
  	  return 1;
  	}
        }
  #endif
      }
    }
    return 0;
  }
  
  
  template <typename FakeCore>
  int pop_blocks(FakeCore& simple_core, int num_blocks)
  {
    bool use_batch = false;
    if (opt_batch)
    {
      if (simple_core.support_batch)
        use_batch = true;
      else
        LOG_PRINT_L0("WARNING: batch transactions enabled but unsupported or unnecessary for this database type - ignoring");
    }
  
    if (use_batch)
      simple_core.batch_start();
  
    int quit = 0;
    block popped_block;
    std::vector<transaction> popped_txs;
    for (int i=0; i < num_blocks; ++i)
    {
      // simple_core.m_storage.pop_block_from_blockchain() is private, so call directly through db
      simple_core.m_storage.get_db().pop_block(popped_block, popped_txs);
      quit = 1;
    }
  
  
  
    if (use_batch)
    {
      if (quit > 1)
      {
        // There was an error, so don't commit pending data.
        // Destructor will abort write txn.
      }
      else
      {
        simple_core.batch_stop();
      }
      simple_core.m_storage.get_db().show_stats();
    }
  
    return num_blocks;
  }
  
  template <typename FakeCore>
  int import_from_file(FakeCore& simple_core, const std::string& import_file_path, uint64_t block_stop=0)
  {
    if (std::is_same<fake_core_db, FakeCore>::value)
    {
      // Reset stats, in case we're using newly created db, accumulating stats
      // from addition of genesis block.
      // This aligns internal db counts with importer counts.
      simple_core.m_storage.get_db().reset_stats();
    }
    boost::filesystem::path fs_import_file_path(import_file_path);
    boost::system::error_code ec;
    if (!boost::filesystem::exists(fs_import_file_path, ec))
    {
      LOG_PRINT_L0("bootstrap file not found: " << fs_import_file_path);
      return false;
    }
  
    BootstrapFile bootstrap;
    // BootstrapFile bootstrap(import_file_path);
    uint64_t total_source_blocks = bootstrap.count_blocks(import_file_path);
    LOG_PRINT_L0("bootstrap file last block number: " << total_source_blocks-1 << " (zero-based height)  total blocks: " << total_source_blocks);
  
    std::cout << ENDL;
    std::cout << "Preparing to read blocks..." << ENDL;
    std::cout << ENDL;
  
    std::ifstream import_file;
    import_file.open(import_file_path, std::ios_base::binary | std::ifstream::in);
  
    uint64_t h = 0;
    uint64_t num_imported = 0;
    if (import_file.fail())
    {
      LOG_PRINT_L0("import_file.open() fail");
      return false;
    }
  
    // 4 byte magic + (currently) 1024 byte header structures
    bootstrap.seek_to_first_chunk(import_file);
  
    std::string str1;
    char buffer1[1024];
    char buffer_block[BUFFER_SIZE];
    block b;
    transaction tx;
    int quit = 0;
    uint64_t bytes_read = 0;
  
    uint64_t start_height = 1;
    if (opt_resume)
      start_height = simple_core.m_storage.get_current_blockchain_height();
  
    // Note that a new blockchain will start with block number 0 (total blocks: 1)
    // due to genesis block being added at initialization.
  
    if (! block_stop)
    {
      block_stop = total_source_blocks - 1;
    }
  
    // These are what we'll try to use, and they don't have to be a determination
    // from source and destination blockchains, but those are the defaults.
    LOG_PRINT_L0("start block: " << start_height << "  stop block: " <<
        block_stop);
  
    bool use_batch = false;
    if (opt_batch)
    {
      if (simple_core.support_batch)
        use_batch = true;
      else
        LOG_PRINT_L0("WARNING: batch transactions enabled but unsupported or unnecessary for this database type - ignoring");
    }
  
    if (use_batch)
      simple_core.batch_start(db_batch_size);
  
    LOG_PRINT_L0("Reading blockchain from bootstrap file...");
    std::cout << ENDL;
  
    // Within the loop, we skip to start_height before we start adding.
    // TODO: Not a bottleneck, but we can use what's done in count_blocks() and
    // only do the chunk size reads, skipping the chunk content reads until we're
    // at start_height.
    while (! quit)
    {
      uint32_t chunk_size;
      import_file.read(buffer1, sizeof(chunk_size));
      // TODO: bootstrap.read_chunk();
      if (! import_file) {
        std::cout << refresh_string;
        LOG_PRINT_L0("End of file reached");
        quit = 1;
        break;
      }
      bytes_read += sizeof(chunk_size);
  
      str1.assign(buffer1, sizeof(chunk_size));
      if (! ::serialization::parse_binary(str1, chunk_size))
      {
        throw std::runtime_error("Error in deserialization of chunk size");
      }
      LOG_PRINT_L3("chunk_size: " << chunk_size);
  
      if (chunk_size > BUFFER_SIZE)
      {
        LOG_PRINT_L0("WARNING: chunk_size " << chunk_size << " > BUFFER_SIZE " << BUFFER_SIZE);
        throw std::runtime_error("Aborting: chunk size exceeds buffer size");
      }
      if (chunk_size > 100000)
      {
        LOG_PRINT_L0("NOTE: chunk_size " << chunk_size << " > 100000");
      }
      else if (chunk_size == 0) {
        LOG_PRINT_L0("ERROR: chunk_size == 0");
        return 2;
      }
      import_file.read(buffer_block, chunk_size);
      if (! import_file) {
        LOG_PRINT_L0("ERROR: unexpected end of file: bytes read before error: "
            << import_file.gcount() << " of chunk_size " << chunk_size);
        return 2;
      }
      bytes_read += chunk_size;
      LOG_PRINT_L3("Total bytes read: " << bytes_read);
  
      if (h + NUM_BLOCKS_PER_CHUNK < start_height + 1)
      {
        h += NUM_BLOCKS_PER_CHUNK;
        continue;
      }
      if (h > block_stop)
      {
        std::cout << refresh_string << "block " << h-1
          << " / " << block_stop
          << std::flush;
        std::cout << ENDL << ENDL;
        LOG_PRINT_L0("Specified block number reached - stopping.  block: " << h-1 << "  total blocks: " << h);
        quit = 1;
        break;
      }
  
      try
      {
        str1.assign(buffer_block, chunk_size);
        bootstrap::block_package bp;
        if (! ::serialization::parse_binary(str1, bp))
          throw std::runtime_error("Error in deserialization of chunk");
  
        int display_interval = 1000;
        int progress_interval = 10;
        // NOTE: use of NUM_BLOCKS_PER_CHUNK is a placeholder in case multi-block chunks are later supported.
        for (int chunk_ind = 0; chunk_ind < NUM_BLOCKS_PER_CHUNK; ++chunk_ind)
        {
          ++h;
          if ((h-1) % display_interval == 0)
          {
            std::cout << refresh_string;
            LOG_PRINT_L0("loading block number " << h-1);
          }
          else
          {
            LOG_PRINT_L3("loading block number " << h-1);
          }
          b = bp.block;
          LOG_PRINT_L2("block prev_id: " << b.prev_id << ENDL);
  
          if ((h-1) % progress_interval == 0)
          {
            std::cout << refresh_string << "block " << h-1
              << " / " << block_stop
              << std::flush;
          }
  
          std::vector<transaction> txs;
          std::vector<transaction> archived_txs;
  
          archived_txs = bp.txs;
  
          // std::cout << refresh_string;
          // LOG_PRINT_L1("txs: " << archived_txs.size());
  
          // if archived_txs is invalid
          // {
          //   std::cout << refresh_string;
          //   LOG_PRINT_RED_L0("exception while de-archiving txs, height=" << h);
          //   quit = 1;
          //   break;
          // }
  
          // tx number 1: coinbase tx
          // tx number 2 onwards: archived_txs
          unsigned int tx_num = 1;
          for (const transaction& tx : archived_txs)
          {
            ++tx_num;
            // if tx is invalid
            // {
            //   LOG_PRINT_RED_L0("exception while indexing tx from txs, height=" << h <<", tx_num=" << tx_num);
            //   quit = 1;
            //   break;
            // }
  
            // std::cout << refresh_string;
            // LOG_PRINT_L1("tx hash: " << get_transaction_hash(tx));
  
            // crypto::hash hsh = null_hash;
            // size_t blob_size = 0;
            // NOTE: all tx hashes except for coinbase tx are available in the block data
            // get_transaction_hash(tx, hsh, blob_size);
            // LOG_PRINT_L0("tx " << tx_num << "  " << hsh << " : " << ENDL);
            // LOG_PRINT_L0(obj_to_json_str(tx) << ENDL);
  
            // add blocks with verification.
            // for Blockchain and blockchain_storage add_new_block().
            if (opt_verify)
            {
              // crypto::hash hsh = null_hash;
              // size_t blob_size = 0;
              // get_transaction_hash(tx, hsh, blob_size);
  
  
              uint8_t version = simple_core.m_storage.get_current_hard_fork_version();
              tx_verification_context tvc = AUTO_VAL_INIT(tvc);
              bool r = true;
              r = simple_core.m_pool.add_tx(tx, tvc, true, true, version);
              if (!r)
              {
                LOG_PRINT_RED_L0("failed to add transaction to transaction pool, height=" << h <<", tx_num=" << tx_num);
                quit = 1;
                break;
              }
            }
            else
            {
              // for add_block() method, without (much) processing.
              // don't add coinbase transaction to txs.
              //
              // because add_block() calls
              // add_transaction(blk_hash, blk.miner_tx) first, and
              // then a for loop for the transactions in txs.
              txs.push_back(tx);
            }
          }
  
          if (opt_verify)
          {
            block_verification_context bvc = boost::value_initialized<block_verification_context>();
            simple_core.m_storage.add_new_block(b, bvc);
  
            if (bvc.m_verifivation_failed)
            {
              LOG_PRINT_L0("Failed to add block to blockchain, verification failed, height = " << h);
              LOG_PRINT_L0("skipping rest of file");
              // ok to commit previously batched data because it failed only in
              // verification of potential new block with nothing added to batch
              // yet
              quit = 1;
              break;
            }
            if (! bvc.m_added_to_main_chain)
            {
              LOG_PRINT_L0("Failed to add block to blockchain, height = " << h);
              LOG_PRINT_L0("skipping rest of file");
              // make sure we don't commit partial block data
              quit = 2;
              break;
            }
          }
          else
          {
            size_t block_size;
            difficulty_type cumulative_difficulty;
            uint64_t coins_generated;
  
            block_size = bp.block_size;
            cumulative_difficulty = bp.cumulative_difficulty;
            coins_generated = bp.coins_generated;
  
            // std::cout << refresh_string;
            // LOG_PRINT_L2("block_size: " << block_size);
            // LOG_PRINT_L2("cumulative_difficulty: " << cumulative_difficulty);
            // LOG_PRINT_L2("coins_generated: " << coins_generated);
  
            try
            {
              simple_core.add_block(b, block_size, cumulative_difficulty, coins_generated, txs);
            }
            catch (const std::exception& e)
            {
              std::cout << refresh_string;
              LOG_PRINT_RED_L0("Error adding block to blockchain: " << e.what());
              quit = 2; // make sure we don't commit partial block data
              break;
            }
          }
          ++num_imported;
  
          if (use_batch)
          {
            if ((h-1) % db_batch_size == 0)
            {
              std::cout << refresh_string;
              // zero-based height
              std::cout << ENDL << "[- batch commit at height " << h-1 << " -]" << ENDL;
              simple_core.batch_stop();
              simple_core.batch_start(db_batch_size);
              std::cout << ENDL;
              simple_core.m_storage.get_db().show_stats();
            }
          }
        }
      }
      catch (const std::exception& e)
      {
        std::cout << refresh_string;
        LOG_PRINT_RED_L0("exception while reading from file, height=" << h << ": " << e.what());
        return 2;
      }
    } // while
  
    import_file.close();
  
    if (use_batch)
    {
      if (quit > 1)
      {
        // There was an error, so don't commit pending data.
        // Destructor will abort write txn.
      }
      else
      {
        simple_core.batch_stop();
      }
      simple_core.m_storage.get_db().show_stats();
      LOG_PRINT_L0("Number of blocks imported: " << num_imported);
      if (h > 0)
        // TODO: if there was an error, the last added block is probably at zero-based height h-2
        LOG_PRINT_L0("Finished at block: " << h-1 << "  total blocks: " << h);
    }
    std::cout << ENDL;
    return 0;
  }
  
  int main(int argc, char* argv[])
  {
    std::string default_db_type = "lmdb";
    std::string default_db_engine_compiled = "blockchain_db";
  
    std::unordered_set<std::string> db_types_all = cryptonote::blockchain_db_types;
    db_types_all.insert("memory");
  
    std::string available_dbs = join_set_strings(db_types_all, ", ");
    available_dbs = "available: " + available_dbs;
  
    uint32_t log_level = LOG_LEVEL_0;
    uint64_t num_blocks = 0;
    uint64_t block_stop = 0;
    std::string m_config_folder;
    std::string db_arg_str;
  
    tools::sanitize_locale();
  
    boost::filesystem::path default_data_path {tools::get_default_data_dir()};
    boost::filesystem::path default_testnet_data_path {default_data_path / "testnet"};
    std::string import_file_path;
  
    po::options_description desc_cmd_only("Command line options");
    po::options_description desc_cmd_sett("Command line options and settings options");
    const command_line::arg_descriptor<std::string> arg_input_file = {"input-file", "Specify input file", "", true};
    const command_line::arg_descriptor<uint32_t> arg_log_level   = {"log-level",  "", log_level};
    const command_line::arg_descriptor<uint64_t> arg_block_stop  = {"block-stop", "Stop at block number", block_stop};
    const command_line::arg_descriptor<uint64_t> arg_batch_size  = {"batch-size", "", db_batch_size};
    const command_line::arg_descriptor<uint64_t> arg_pop_blocks  = {"pop-blocks", "Remove blocks from end of blockchain", num_blocks};
    const command_line::arg_descriptor<bool>        arg_drop_hf  = {"drop-hard-fork", "Drop hard fork subdbs", false};
    const command_line::arg_descriptor<bool>     arg_testnet_on  = {
      "testnet"
        , "Run on testnet."
        , false
    };
    const command_line::arg_descriptor<bool>     arg_count_blocks = {
      "count-blocks"
        , "Count blocks in bootstrap file and exit"
        , false
    };
    const command_line::arg_descriptor<std::string> arg_database = {
      "database", available_dbs.c_str(), default_db_type
    };
    const command_line::arg_descriptor<bool> arg_verify =  {"verify",
      "Verify blocks and transactions during import", true};
    const command_line::arg_descriptor<bool> arg_batch  =  {"batch",
      "Batch transactions for faster import", true};
    const command_line::arg_descriptor<bool> arg_resume =  {"resume",
      "Resume from current height if output database already exists", true};
  
    command_line::add_arg(desc_cmd_sett, command_line::arg_data_dir, default_data_path.string());
    command_line::add_arg(desc_cmd_sett, command_line::arg_testnet_data_dir, default_testnet_data_path.string());
    command_line::add_arg(desc_cmd_sett, arg_input_file);
    command_line::add_arg(desc_cmd_sett, arg_testnet_on);
    command_line::add_arg(desc_cmd_sett, arg_log_level);
    command_line::add_arg(desc_cmd_sett, arg_database);
    command_line::add_arg(desc_cmd_sett, arg_batch_size);
    command_line::add_arg(desc_cmd_sett, arg_block_stop);
  
    command_line::add_arg(desc_cmd_only, arg_count_blocks);
    command_line::add_arg(desc_cmd_only, arg_pop_blocks);
    command_line::add_arg(desc_cmd_only, arg_drop_hf);
    command_line::add_arg(desc_cmd_only, command_line::arg_help);
  
    // call add_options() directly for these arguments since
    // command_line helpers support only boolean switch, not boolean argument
    desc_cmd_sett.add_options()
      (arg_verify.name, make_semantic(arg_verify), arg_verify.description)
      (arg_batch.name,  make_semantic(arg_batch),  arg_batch.description)
      (arg_resume.name, make_semantic(arg_resume), arg_resume.description)
      ;
  
    po::options_description desc_options("Allowed options");
    desc_options.add(desc_cmd_only).add(desc_cmd_sett);
  
    po::variables_map vm;
    bool r = command_line::handle_error_helper(desc_options, [&]()
    {
      po::store(po::parse_command_line(argc, argv, desc_options), vm);
      po::notify(vm);
      return true;
    });
    if (! r)
      return 1;
  
    log_level     = command_line::get_arg(vm, arg_log_level);
    opt_verify    = command_line::get_arg(vm, arg_verify);
    opt_batch     = command_line::get_arg(vm, arg_batch);
    opt_resume    = command_line::get_arg(vm, arg_resume);
    block_stop    = command_line::get_arg(vm, arg_block_stop);
    db_batch_size = command_line::get_arg(vm, arg_batch_size);
  
    if (command_line::get_arg(vm, command_line::arg_help))
    {
      std::cout << "Agio '" << AGIO_RELEASE_NAME << "' (v" << AGIO_VERSION_FULL << ")" << ENDL << ENDL;
      std::cout << desc_options << std::endl;
      return 1;
    }
  
    if (! opt_batch && ! vm["batch-size"].defaulted())
    {
      std::cerr << "Error: batch-size set, but batch option not enabled" << ENDL;
      return 1;
    }
    if (! db_batch_size)
    {
      std::cerr << "Error: batch-size must be > 0" << ENDL;
      return 1;
    }
    if (opt_verify && vm["batch-size"].defaulted())
    {
      // usually want batch size default lower if verify on, so progress can be
      // frequently saved.
      //
      // currently, with Windows, default batch size is low, so ignore
      // default db_batch_size_verify unless it's even lower
      if (db_batch_size > db_batch_size_verify)
      {
        db_batch_size = db_batch_size_verify;
      }
    }
  
    opt_testnet = command_line::get_arg(vm, arg_testnet_on);
    auto data_dir_arg = opt_testnet ? command_line::arg_testnet_data_dir : command_line::arg_data_dir;
    m_config_folder = command_line::get_arg(vm, data_dir_arg);
    db_arg_str = command_line::get_arg(vm, arg_database);
  
    log_space::get_set_log_detalisation_level(true, log_level);
    log_space::log_singletone::add_logger(LOGGER_CONSOLE, NULL, NULL);
    LOG_PRINT_L0("Starting...");
    LOG_PRINT_L0("Setting log level = " << log_level);
  
    boost::filesystem::path fs_import_file_path;
  
    if (command_line::has_arg(vm, arg_input_file))
      fs_import_file_path = boost::filesystem::path(command_line::get_arg(vm, arg_input_file));
    else
      fs_import_file_path = boost::filesystem::path(m_config_folder) / "export" / BLOCKCHAIN_RAW;
  
    import_file_path = fs_import_file_path.string();
  
    if (command_line::has_arg(vm, arg_count_blocks))
    {
      BootstrapFile bootstrap;
      bootstrap.count_blocks(import_file_path);
      return 0;
    }
  
  
    std::string db_type;
    std::string db_engine_compiled;
    int db_flags = 0;
    int res = 0;
    res = parse_db_arguments(db_arg_str, db_type, db_flags);
    if (res)
    {
      std::cerr << "Error parsing database argument(s)" << ENDL;
      return 1;
    }
  
    if (db_types_all.count(db_type) == 0)
    {
      std::cerr << "Invalid database type: " << db_type << std::endl;
      return 1;
    }
  
    if ((db_type == "lmdb") || (db_type == "berkeley"))
    {
      db_engine_compiled = "blockchain_db";
    }
    else
    {
      db_engine_compiled = "memory";
    }
  
    LOG_PRINT_L0("database: " << db_type);
    LOG_PRINT_L0("database flags: " << db_flags);
    LOG_PRINT_L0("verify:  " << std::boolalpha << opt_verify << std::noboolalpha);
    if (opt_batch)
    {
      LOG_PRINT_L0("batch:   " << std::boolalpha << opt_batch << std::noboolalpha
          << "  batch size: " << db_batch_size);
    }
    else
    {
      LOG_PRINT_L0("batch:   " << std::boolalpha << opt_batch << std::noboolalpha);
    }
    LOG_PRINT_L0("resume:  " << std::boolalpha << opt_resume  << std::noboolalpha);
    LOG_PRINT_L0("testnet: " << std::boolalpha << opt_testnet << std::noboolalpha);
  
    LOG_PRINT_L0("bootstrap file path: " << import_file_path);
    LOG_PRINT_L0("database path:       " << m_config_folder);
  
    try
    {
  
    // fake_core needed for verification to work when enabled.
    //
    // NOTE: don't need fake_core method of doing things when we're going to call
    // BlockchainDB add_block() directly and have available the 3 block
    // properties to do so. Both ways work, but fake core isn't necessary in that
    // circumstance.
  
    // for multi_db_runtime:
    if (db_type == "lmdb" || db_type == "berkeley")
    {
      fake_core_db simple_core(m_config_folder, opt_testnet, opt_batch, db_type, db_flags);
      import_from_file(simple_core, import_file_path, block_stop);
    }
    else
    {
      std::cerr << "database type unrecognized" << ENDL;
      return 1;
    }
  
    // for multi_db_compile:
    fake_core_db simple_core(m_config_folder, opt_testnet, opt_batch, db_type, db_flags);
  
    if (! vm["pop-blocks"].defaulted())
    {
      num_blocks = command_line::get_arg(vm, arg_pop_blocks);
      LOG_PRINT_L0("height: " << simple_core.m_storage.get_current_blockchain_height());
      pop_blocks(simple_core, num_blocks);
      LOG_PRINT_L0("height: " << simple_core.m_storage.get_current_blockchain_height());
      return 0;
    }
  
    if (! vm["drop-hard-fork"].defaulted())
    {
      LOG_PRINT_L0("Dropping hard fork tables...");
      simple_core.m_storage.get_db().drop_hard_fork_info();
      return 0;
    }
  
    import_from_file(simple_core, import_file_path, block_stop);
  
    }
    catch (const DB_ERROR& e)
    {
      std::cout << std::string("Error loading blockchain db: ") + e.what() + " -- shutting down now" << ENDL;
      return 1;
    }
  
    // destructors called at exit:
    //
    // ensure db closed
    //   - transactions properly checked and handled
    //   - disk sync if needed
    //
    // fake_core object's destructor is called when it goes out of scope. For an
    // LMDB fake_core, it calls Blockchain::deinit() on its object, which in turn
    // calls delete on its BlockchainDB derived class' object, which closes its
    // files.
    return 0;
  }
  