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Allow BlockchainLMDB to be opened in read-only mode

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Have blockchain_export use read-only mode when source is BlockchainLMDB.
This commit is contained in:
warptangent 2015-05-16 01:29:02 -07:00
parent 73d3511412
commit d35bffb950
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2 changed files with 11 additions and 4 deletions
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8
src/blockchain_db/lmdb/db_lmdb.cpp
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@ -678,9 +678,13 @@ void BlockchainLMDB::open(const std::string& filename, const int mdb_flags)
if (auto result = mdb_env_open(m_env, filename.c_str(), mdb_flags, 0644)) if (auto result = mdb_env_open(m_env, filename.c_str(), mdb_flags, 0644))
throw0(DB_ERROR(std::string("Failed to open lmdb environment: ").append(mdb_strerror(result)).c_str())); throw0(DB_ERROR(std::string("Failed to open lmdb environment: ").append(mdb_strerror(result)).c_str()));
// get a read/write MDB_txn int txn_flags = 0;
if (mdb_flags & MDB_RDONLY)
txn_flags |= MDB_RDONLY;
// get a read/write MDB_txn, depending on mdb_flags
mdb_txn_safe txn; mdb_txn_safe txn;
if (mdb_txn_begin(m_env, NULL, 0, txn)) if (mdb_txn_begin(m_env, NULL, txn_flags, txn))
throw0(DB_ERROR("Failed to create a transaction for the db")); throw0(DB_ERROR("Failed to create a transaction for the db"));
// open necessary databases, and set properties as needed // open necessary databases, and set properties as needed

7
src/blockchain_utilities/blockchain_export.cpp
View file

@ -129,11 +129,14 @@ int main(int argc, char* argv[])
BlockchainDB* db = new BlockchainLMDB(); BlockchainDB* db = new BlockchainLMDB();
boost::filesystem::path folder(m_config_folder); boost::filesystem::path folder(m_config_folder);
folder /= db->get_db_name(); folder /= db->get_db_name();
LOG_PRINT_L0("Loading blockchain from folder " << folder.string() << " ..."); int lmdb_flags = 0;
lmdb_flags |= MDB_RDONLY;
const std::string filename = folder.string(); const std::string filename = folder.string();
LOG_PRINT_L0("Loading blockchain from folder " << filename << " ...");
try try
{ {
db->open(filename); db->open(filename, lmdb_flags);
} }
catch (const std::exception& e) catch (const std::exception& e)
{ {