Allow BlockchainLMDB to be opened in read-only mode
Have blockchain_export use read-only mode when source is BlockchainLMDB.
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2 changed files with 11 additions and 4 deletions
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@ -678,9 +678,13 @@ void BlockchainLMDB::open(const std::string& filename, const int mdb_flags)
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if (auto result = mdb_env_open(m_env, filename.c_str(), mdb_flags, 0644))
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throw0(DB_ERROR(std::string("Failed to open lmdb environment: ").append(mdb_strerror(result)).c_str()));
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// get a read/write MDB_txn
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int txn_flags = 0;
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if (mdb_flags & MDB_RDONLY)
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txn_flags |= MDB_RDONLY;
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// get a read/write MDB_txn, depending on mdb_flags
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mdb_txn_safe txn;
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if (mdb_txn_begin(m_env, NULL, 0, txn))
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if (mdb_txn_begin(m_env, NULL, txn_flags, txn))
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throw0(DB_ERROR("Failed to create a transaction for the db"));
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// open necessary databases, and set properties as needed
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@ -129,11 +129,14 @@ int main(int argc, char* argv[])
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BlockchainDB* db = new BlockchainLMDB();
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boost::filesystem::path folder(m_config_folder);
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folder /= db->get_db_name();
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LOG_PRINT_L0("Loading blockchain from folder " << folder.string() << " ...");
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int lmdb_flags = 0;
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lmdb_flags |= MDB_RDONLY;
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const std::string filename = folder.string();
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LOG_PRINT_L0("Loading blockchain from folder " << filename << " ...");
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try
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{
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db->open(filename);
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db->open(filename, lmdb_flags);
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}
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catch (const std::exception& e)
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{
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