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BlockchainLMDB: Deal with DB exceptions at block level with particularity

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Add another DB error exception type to distinguish failed txn setup from
general use of txn.

This keeps the error handling flow the same as before the block-level
txn setup changes that moved control up a layer to BlockchainDB.
This commit is contained in:
warptangent 2016-02-13 04:10:27 -08:00
parent c16cc204d3
commit 1995923559
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GPG key ID: 0E490BEBFBE4E92D
2 changed files with 21 additions and 2 deletions
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8
src/blockchain_db/blockchain_db.h
View file

@ -175,6 +175,14 @@ class DB_ERROR : public DB_EXCEPTION
DB_ERROR(const char* s) : DB_EXCEPTION(s) { }
};
// For distinguishing errors trying to set up a DB txn from other errors
class DB_ERROR_TXN_START : public DB_EXCEPTION
{
public:
DB_ERROR_TXN_START() : DB_EXCEPTION("DB Error in starting txn") { }
DB_ERROR_TXN_START(const char* s) : DB_EXCEPTION(s) { }
};
class DB_OPEN_FAILURE : public DB_EXCEPTION
{
public:

15
src/blockchain_db/lmdb/db_lmdb.cpp
View file

@ -2199,8 +2199,15 @@ void BlockchainLMDB::set_batch_transactions(bool batch_transactions)
void BlockchainLMDB::block_txn_start()
{
LOG_PRINT_L3("BlockchainLMDB::" << __func__);
// Distinguish the exceptions here from exceptions that would be thrown while
// using the txn and committing it.
//
// If an exception is thrown in this setup, we don't want the caller to catch
// it and proceed as if there were an existing write txn, such as trying to
// call block_txn_abort(). It also indicates a serious issue which will
// probably be thrown up another layer.
if (! m_batch_active && m_write_txn)
throw0(DB_ERROR((std::string("Attempted to start new write txn when write txn already exists in ")+__FUNCTION__).c_str()));
throw0(DB_ERROR_TXN_START((std::string("Attempted to start new write txn when write txn already exists in ")+__FUNCTION__).c_str()));
if (! m_batch_active)
{
m_write_txn = new mdb_txn_safe();
@ -2208,7 +2215,7 @@ void BlockchainLMDB::block_txn_start()
{
delete m_write_txn;
m_write_txn = nullptr;
throw0(DB_ERROR(lmdb_error("Failed to create a transaction for the db: ", mdb_res).c_str()));
throw0(DB_ERROR_TXN_START(lmdb_error("Failed to create a transaction for the db: ", mdb_res).c_str()));
}
}
}
@ -2270,6 +2277,10 @@ uint64_t BlockchainLMDB::add_block(const block& blk, const size_t& block_size, c
{
BlockchainDB::add_block(blk, block_size, cumulative_difficulty, coins_generated, txs);
}
catch (DB_ERROR_TXN_START& e)
{
throw;
}
catch (...)
{
m_num_outputs = num_outputs;