Method LoadBlockIndexDB

src/node/blockstorage.cpp:548–608

}

bool BlockManager::LoadBlockIndexDB(const std::optional<uint256>& snapshot_blockhash)
{
    AssertLockHeld(::cs_main);
    if (!LoadBlockIndex(snapshot_blockhash)) {
        return false;
    }
    int max_blockfile_num{0};

    // Load block file info
    m_block_tree_db->ReadLastBlockFile(max_blockfile_num);
    m_blockfile_info.resize(max_blockfile_num + 1);
    LogInfo("Loading block index db: last block file = %i", max_blockfile_num);
    for (int nFile = 0; nFile <= max_blockfile_num; nFile++) {
        m_block_tree_db->ReadBlockFileInfo(nFile, m_blockfile_info[nFile]);
    }
    LogInfo("Loading block index db: last block file info: %s", m_blockfile_info[max_blockfile_num].ToString());
    for (int nFile = max_blockfile_num + 1; true; nFile++) {
        CBlockFileInfo info;
        if (m_block_tree_db->ReadBlockFileInfo(nFile, info)) {
            m_blockfile_info.push_back(info);
        } else {
            break;
        }
    }

    // Check presence of blk files
    LogInfo("Checking all blk files are present...");
    std::set<int> setBlkDataFiles;
    for (const auto& [_, block_index] : m_block_index) {
        if (block_index.nStatus & BLOCK_HAVE_DATA) {
            setBlkDataFiles.insert(block_index.nFile);
        }
    }
    for (std::set<int>::iterator it = setBlkDataFiles.begin(); it != setBlkDataFiles.end(); it++) {
        FlatFilePos pos(*it, 0);
        if (OpenBlockFile(pos, /*fReadOnly=*/true).IsNull()) {
            return false;
        }
    }

    {
        // Initialize the blockfile cursors.
        for (size_t i = 0; i < m_blockfile_info.size(); ++i) {
            const auto last_height_in_file = m_blockfile_info[i].nHeightLast;
            m_blockfile_cursors[BlockfileTypeForHeight(last_height_in_file)] = {static_cast<int>(i), 0};
        }
    }

    // Check whether we have ever pruned block & undo files
    m_block_tree_db->ReadFlag("prunedblockfiles", m_have_pruned);
    if (m_have_pruned) {
        LogInfo("Loading block index db: Block files have previously been pruned");
    }

    // Check whether we need to continue reindexing
    bool fReindexing = false;
    m_block_tree_db->ReadReindexing(fReindexing);
    if (fReindexing) m_blockfiles_indexed = false;