blockchain_export can now export to a blocks.dat format

Also make the number of blocks endian independant, and add
support for testnet

1 files changed, 170 insertions, 0 deletions

diff --git a/src/blockchain_utilities/blocksdat_file.cpp b/src/blockchain_utilities/blocksdat_file.cpp
new file mode 100644
index 000000000..f7de2a480
--- /dev/null
+++ b/src/blockchain_utilities/blocksdat_file.cpp
@@ -0,0 +1,170 @@
+// Copyright (c) 2014-2015, The Monero 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 "blocksdat_file.h"
+
+
+namespace po = boost::program_options;
+
+using namespace cryptonote;
+using namespace epee;
+
+namespace
+{
+  std::string refresh_string = "\r                                    \r";
+}
+
+
+
+bool BlocksdatFile::open_writer(const boost::filesystem::path& file_path, uint64_t block_stop)
+{
+  const boost::filesystem::path dir_path = file_path.parent_path();
+  if (!dir_path.empty())
+  {
+    if (boost::filesystem::exists(dir_path))
+    {
+      if (!boost::filesystem::is_directory(dir_path))
+      {
+        LOG_PRINT_RED_L0("export directory path is a file: " << dir_path);
+        return false;
+      }
+    }
+    else
+    {
+      if (!boost::filesystem::create_directory(dir_path))
+      {
+        LOG_PRINT_RED_L0("Failed to create directory " << dir_path);
+        return false;
+      }
+    }
+  }
+
+  m_raw_data_file = new std::ofstream();
+
+  uint64_t num_blocks = 0;
+
+  LOG_PRINT_L0("creating file");
+
+  m_raw_data_file->open(file_path.string(), std::ios_base::binary | std::ios_base::out | std::ios::trunc);
+  if (m_raw_data_file->fail())
+    return false;
+
+  initialize_file(block_stop);
+
+  return true;
+}
+
+
+bool BlocksdatFile::initialize_file(uint64_t block_stop)
+{
+  const uint32_t nblocks = block_stop + 1;
+  unsigned char nblocksc[4];
+
+  nblocksc[0] = nblocks & 0xff;
+  nblocksc[1] = (nblocks >> 8) & 0xff;
+  nblocksc[2] = (nblocks >> 16) & 0xff;
+  nblocksc[3] = (nblocks >> 24) & 0xff;
+
+  // 4 bytes little endian
+  *m_raw_data_file << nblocksc[0];
+  *m_raw_data_file << nblocksc[1];
+  *m_raw_data_file << nblocksc[2];
+  *m_raw_data_file << nblocksc[3];
+
+  return true;
+}
+
+void BlocksdatFile::write_block(const crypto::hash& block_hash)
+{
+  const std::string data(block_hash.data, sizeof(block_hash));
+  *m_raw_data_file << data;
+}
+
+bool BlocksdatFile::close()
+{
+  if (m_raw_data_file->fail())
+    return false;
+
+  m_raw_data_file->flush();
+  delete m_raw_data_file;
+  return true;
+}
+
+
+#if SOURCE_DB == DB_MEMORY
+bool BlocksdatFile::store_blockchain_raw(blockchain_storage* _blockchain_storage, tx_memory_pool* _tx_pool, boost::filesystem::path& output_file, uint64_t requested_block_stop)
+#else
+bool BlocksdatFile::store_blockchain_raw(Blockchain* _blockchain_storage, tx_memory_pool* _tx_pool, boost::filesystem::path& output_file, uint64_t requested_block_stop)
+#endif
+{
+  uint64_t num_blocks_written = 0;
+  m_blockchain_storage = _blockchain_storage;
+  uint64_t progress_interval = 100;
+  block b;
+
+  uint64_t block_start = 0;
+  uint64_t block_stop = 0;
+  LOG_PRINT_L0("source blockchain height: " <<  m_blockchain_storage->get_current_blockchain_height()-1);
+  if ((requested_block_stop > 0) && (requested_block_stop < m_blockchain_storage->get_current_blockchain_height()))
+  {
+    LOG_PRINT_L0("Using requested block height: " << requested_block_stop);
+    block_stop = requested_block_stop;
+  }
+  else
+  {
+    block_stop = m_blockchain_storage->get_current_blockchain_height() - 1;
+    LOG_PRINT_L0("Using block height of source blockchain: " << block_stop);
+  }
+  LOG_PRINT_L0("Storing blocks raw data...");
+  if (!BlocksdatFile::open_writer(output_file, block_stop))
+  {
+    LOG_PRINT_RED_L0("failed to open raw file for write");
+    return false;
+  }
+  for (m_cur_height = block_start; m_cur_height <= block_stop; ++m_cur_height)
+  {
+    // this method's height refers to 0-based height (genesis block = height 0)
+    crypto::hash hash = m_blockchain_storage->get_block_id_by_height(m_cur_height);
+    write_block(hash);
+    if (m_cur_height % NUM_BLOCKS_PER_CHUNK == 0) {
+      num_blocks_written += NUM_BLOCKS_PER_CHUNK;
+    }
+    if (m_cur_height % progress_interval == 0) {
+      std::cout << refresh_string;
+      std::cout << "block " << m_cur_height << "/" << block_stop << std::flush;
+    }
+  }
+  // print message for last block, which may not have been printed yet due to progress_interval
+  std::cout << refresh_string;
+  std::cout << "block " << m_cur_height-1 << "/" << block_stop << ENDL;
+
+  LOG_PRINT_L0("Number of blocks exported: " << num_blocks_written);
+
+  return BlocksdatFile::close();
+}
+