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Fix data refs in read-only txns

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Data is only guaranteed to be valid within the lifetime of a txn.
You cannot use data returned from LMDB after the txn ends.
Also, fixed a missing txn.commit BlockchainLMDB::get_tx_unlock_time()
This commit is contained in:
Howard Chu 2015-12-10 01:42:36 +00:00
parent e175205e6e
commit d98d5e79cb
1 changed files with 42 additions and 16 deletions
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58
src/blockchain_db/lmdb/db_lmdb.cpp
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@ -1238,6 +1238,7 @@ uint64_t BlockchainLMDB::get_block_height(const crypto::hash& h) const
LOG_PRINT_L3("BlockchainLMDB::" << __func__); LOG_PRINT_L3("BlockchainLMDB::" << __func__);
check_open(); check_open();
uint64_t ret;
mdb_txn_safe txn; mdb_txn_safe txn;
if (mdb_txn_begin(m_env, NULL, MDB_RDONLY, txn)) if (mdb_txn_begin(m_env, NULL, MDB_RDONLY, txn))
throw0(DB_ERROR("Failed to create a transaction for the db")); throw0(DB_ERROR("Failed to create a transaction for the db"));
@ -1250,8 +1251,9 @@ uint64_t BlockchainLMDB::get_block_height(const crypto::hash& h) const
else if (get_result) else if (get_result)
throw0(DB_ERROR("Error attempting to retrieve a block height from the db")); throw0(DB_ERROR("Error attempting to retrieve a block height from the db"));
ret = *(const uint64_t *)result.mv_data;
txn.commit(); txn.commit();
return *(const uint64_t*)result.mv_data; return ret;
} }
block_header BlockchainLMDB::get_block_header(const crypto::hash& h) const block_header BlockchainLMDB::get_block_header(const crypto::hash& h) const
@ -1282,8 +1284,6 @@ block BlockchainLMDB::get_block_from_height(const uint64_t& height) const
else if (get_result) else if (get_result)
throw0(DB_ERROR("Error attempting to retrieve a block from the db")); throw0(DB_ERROR("Error attempting to retrieve a block from the db"));
txn.commit();
blobdata bd; blobdata bd;
bd.assign(reinterpret_cast<char*>(result.mv_data), result.mv_size); bd.assign(reinterpret_cast<char*>(result.mv_data), result.mv_size);
@ -1291,6 +1291,8 @@ block BlockchainLMDB::get_block_from_height(const uint64_t& height) const
if (!parse_and_validate_block_from_blob(bd, b)) if (!parse_and_validate_block_from_blob(bd, b))
throw0(DB_ERROR("Failed to parse block from blob retrieved from the db")); throw0(DB_ERROR("Failed to parse block from blob retrieved from the db"));
txn.commit();
return b; return b;
} }
@ -1299,6 +1301,7 @@ uint64_t BlockchainLMDB::get_block_timestamp(const uint64_t& height) const
LOG_PRINT_L3("BlockchainLMDB::" << __func__); LOG_PRINT_L3("BlockchainLMDB::" << __func__);
check_open(); check_open();
uint64_t ret;
mdb_txn_safe txn; mdb_txn_safe txn;
mdb_txn_safe* txn_ptr = &txn; mdb_txn_safe* txn_ptr = &txn;
if (m_batch_active) if (m_batch_active)
@ -1318,9 +1321,10 @@ uint64_t BlockchainLMDB::get_block_timestamp(const uint64_t& height) const
else if (get_result) else if (get_result)
throw0(DB_ERROR("Error attempting to retrieve a timestamp from the db")); throw0(DB_ERROR("Error attempting to retrieve a timestamp from the db"));
ret = *(const uint64_t *)result.mv_data;
if (! m_batch_active) if (! m_batch_active)
txn.commit(); txn.commit();
return *(const uint64_t*)result.mv_data; return ret;
} }
uint64_t BlockchainLMDB::get_top_block_timestamp() const uint64_t BlockchainLMDB::get_top_block_timestamp() const
@ -1352,6 +1356,7 @@ size_t BlockchainLMDB::get_block_size(const uint64_t& height) const
throw0(DB_ERROR("Failed to create a transaction for the db")); throw0(DB_ERROR("Failed to create a transaction for the db"));
} }
size_t ret;
MDB_val_copy<uint64_t> key(height); MDB_val_copy<uint64_t> key(height);
MDB_val result; MDB_val result;
auto get_result = mdb_get(*txn_ptr, m_block_sizes, &key, &result); auto get_result = mdb_get(*txn_ptr, m_block_sizes, &key, &result);
@ -1362,9 +1367,10 @@ size_t BlockchainLMDB::get_block_size(const uint64_t& height) const
else if (get_result) else if (get_result)
throw0(DB_ERROR("Error attempting to retrieve a block size from the db")); throw0(DB_ERROR("Error attempting to retrieve a block size from the db"));
ret = *(const size_t *)result.mv_data;
if (! m_batch_active) if (! m_batch_active)
txn.commit(); txn.commit();
return *(const size_t*)result.mv_data; return ret;
} }
difficulty_type BlockchainLMDB::get_block_cumulative_difficulty(const uint64_t& height) const difficulty_type BlockchainLMDB::get_block_cumulative_difficulty(const uint64_t& height) const
@ -1372,6 +1378,7 @@ difficulty_type BlockchainLMDB::get_block_cumulative_difficulty(const uint64_t&
LOG_PRINT_L3("BlockchainLMDB::" << __func__ << " height: " << height); LOG_PRINT_L3("BlockchainLMDB::" << __func__ << " height: " << height);
check_open(); check_open();
difficulty_type ret;
mdb_txn_safe txn; mdb_txn_safe txn;
mdb_txn_safe* txn_ptr = &txn; mdb_txn_safe* txn_ptr = &txn;
if (m_batch_active) if (m_batch_active)
@ -1391,9 +1398,10 @@ difficulty_type BlockchainLMDB::get_block_cumulative_difficulty(const uint64_t&
else if (get_result) else if (get_result)
throw0(DB_ERROR("Error attempting to retrieve a cumulative difficulty from the db")); throw0(DB_ERROR("Error attempting to retrieve a cumulative difficulty from the db"));
ret = *(difficulty_type*)result.mv_data;
if (! m_batch_active) if (! m_batch_active)
txn.commit(); txn.commit();
return *(difficulty_type*)result.mv_data; return ret;
} }
difficulty_type BlockchainLMDB::get_block_difficulty(const uint64_t& height) const difficulty_type BlockchainLMDB::get_block_difficulty(const uint64_t& height) const
@ -1418,6 +1426,7 @@ uint64_t BlockchainLMDB::get_block_already_generated_coins(const uint64_t& heigh
LOG_PRINT_L3("BlockchainLMDB::" << __func__); LOG_PRINT_L3("BlockchainLMDB::" << __func__);
check_open(); check_open();
uint64_t ret;
mdb_txn_safe txn; mdb_txn_safe txn;
mdb_txn_safe* txn_ptr = &txn; mdb_txn_safe* txn_ptr = &txn;
if (m_batch_active) if (m_batch_active)
@ -1438,9 +1447,10 @@ uint64_t BlockchainLMDB::get_block_already_generated_coins(const uint64_t& heigh
else if (get_result) else if (get_result)
throw0(DB_ERROR("Error attempting to retrieve a total generated coins from the db")); throw0(DB_ERROR("Error attempting to retrieve a total generated coins from the db"));
ret = *(const uint64_t*)result.mv_data;
if (! m_batch_active) if (! m_batch_active)
txn.commit(); txn.commit();
return *(const uint64_t*)result.mv_data; return ret;
} }
crypto::hash BlockchainLMDB::get_block_hash_from_height(const uint64_t& height) const crypto::hash BlockchainLMDB::get_block_hash_from_height(const uint64_t& height) const
@ -1448,6 +1458,7 @@ crypto::hash BlockchainLMDB::get_block_hash_from_height(const uint64_t& height)
LOG_PRINT_L3("BlockchainLMDB::" << __func__); LOG_PRINT_L3("BlockchainLMDB::" << __func__);
check_open(); check_open();
crypto::hash ret;
mdb_txn_safe txn; mdb_txn_safe txn;
mdb_txn_safe* txn_ptr = &txn; mdb_txn_safe* txn_ptr = &txn;
if (m_batch_active) if (m_batch_active)
@ -1469,9 +1480,10 @@ crypto::hash BlockchainLMDB::get_block_hash_from_height(const uint64_t& height)
throw0(DB_ERROR(std::string("Error attempting to retrieve a block hash from the db: "). throw0(DB_ERROR(std::string("Error attempting to retrieve a block hash from the db: ").
append(mdb_strerror(get_result)).c_str())); append(mdb_strerror(get_result)).c_str()));
ret = *(crypto::hash*)result.mv_data;
if (! m_batch_active) if (! m_batch_active)
txn.commit(); txn.commit();
return *(crypto::hash*)result.mv_data; return ret;
} }
std::vector<block> BlockchainLMDB::get_blocks_range(const uint64_t& h1, const uint64_t& h2) const std::vector<block> BlockchainLMDB::get_blocks_range(const uint64_t& h1, const uint64_t& h2) const
@ -1558,10 +1570,10 @@ bool BlockchainLMDB::tx_exists(const crypto::hash& h) const
auto get_result = mdb_get(*txn_ptr, m_txs, &key, &result); auto get_result = mdb_get(*txn_ptr, m_txs, &key, &result);
TIME_MEASURE_FINISH(time1); TIME_MEASURE_FINISH(time1);
time_tx_exists += time1; time_tx_exists += time1;
if (! m_batch_active)
txn.commit();
if (get_result == MDB_NOTFOUND) if (get_result == MDB_NOTFOUND)
{ {
if (! m_batch_active)
txn.commit();
LOG_PRINT_L1("transaction with hash " << epee::string_tools::pod_to_hex(h) << " not found in db"); LOG_PRINT_L1("transaction with hash " << epee::string_tools::pod_to_hex(h) << " not found in db");
return false; return false;
} }
@ -1576,6 +1588,7 @@ uint64_t BlockchainLMDB::get_tx_unlock_time(const crypto::hash& h) const
LOG_PRINT_L3("BlockchainLMDB::" << __func__); LOG_PRINT_L3("BlockchainLMDB::" << __func__);
check_open(); check_open();
uint64_t ret;
mdb_txn_safe txn; mdb_txn_safe txn;
if (mdb_txn_begin(m_env, NULL, MDB_RDONLY, txn)) if (mdb_txn_begin(m_env, NULL, MDB_RDONLY, txn))
throw0(DB_ERROR("Failed to create a transaction for the db")); throw0(DB_ERROR("Failed to create a transaction for the db"));
@ -1588,7 +1601,9 @@ uint64_t BlockchainLMDB::get_tx_unlock_time(const crypto::hash& h) const
else if (get_result) else if (get_result)
throw0(DB_ERROR("DB error attempting to fetch tx unlock time from hash")); throw0(DB_ERROR("DB error attempting to fetch tx unlock time from hash"));
return *(const uint64_t*)result.mv_data; ret = *(const uint64_t*)result.mv_data;
txn.commit();
return ret;
} }
transaction BlockchainLMDB::get_tx(const crypto::hash& h) const transaction BlockchainLMDB::get_tx(const crypto::hash& h) const
@ -1663,6 +1678,7 @@ uint64_t BlockchainLMDB::get_tx_block_height(const crypto::hash& h) const
LOG_PRINT_L3("BlockchainLMDB::" << __func__); LOG_PRINT_L3("BlockchainLMDB::" << __func__);
check_open(); check_open();
uint64_t ret;
mdb_txn_safe txn; mdb_txn_safe txn;
mdb_txn_safe* txn_ptr = &txn; mdb_txn_safe* txn_ptr = &txn;
if (m_batch_active) if (m_batch_active)
@ -1683,10 +1699,11 @@ uint64_t BlockchainLMDB::get_tx_block_height(const crypto::hash& h) const
else if (get_result) else if (get_result)
throw0(DB_ERROR("DB error attempting to fetch tx height from hash")); throw0(DB_ERROR("DB error attempting to fetch tx height from hash"));
ret = *(const uint64_t*)result.mv_data;
if (! m_batch_active) if (! m_batch_active)
txn.commit(); txn.commit();
return *(const uint64_t*)result.mv_data; return ret;
} }
uint64_t BlockchainLMDB::get_num_outputs(const uint64_t& amount) const uint64_t BlockchainLMDB::get_num_outputs(const uint64_t& amount) const
@ -1723,6 +1740,7 @@ output_data_t BlockchainLMDB::get_output_key(const uint64_t &global_index) const
LOG_PRINT_L3("BlockchainLMDB::" << __func__); LOG_PRINT_L3("BlockchainLMDB::" << __func__);
check_open(); check_open();
output_data_t ret;
mdb_txn_safe txn; mdb_txn_safe txn;
if (mdb_txn_begin(m_env, NULL, MDB_RDONLY, txn)) if (mdb_txn_begin(m_env, NULL, MDB_RDONLY, txn))
throw0(DB_ERROR("Failed to create a transaction for the db")); throw0(DB_ERROR("Failed to create a transaction for the db"));
@ -1734,8 +1752,9 @@ output_data_t BlockchainLMDB::get_output_key(const uint64_t &global_index) const
throw1(OUTPUT_DNE("Attempting to get output pubkey by global index, but key does not exist")); throw1(OUTPUT_DNE("Attempting to get output pubkey by global index, but key does not exist"));
else if (get_result) else if (get_result)
throw0(DB_ERROR("Error attempting to retrieve an output pubkey from the db")); throw0(DB_ERROR("Error attempting to retrieve an output pubkey from the db"));
ret = *(output_data_t *) v.mv_data;
txn.commit(); txn.commit();
return *(output_data_t *) v.mv_data; return ret;
} }
output_data_t BlockchainLMDB::get_output_key(const uint64_t& amount, const uint64_t& index) output_data_t BlockchainLMDB::get_output_key(const uint64_t& amount, const uint64_t& index)
@ -1752,6 +1771,7 @@ tx_out_index BlockchainLMDB::get_output_tx_and_index_from_global(const uint64_t&
LOG_PRINT_L3("BlockchainLMDB::" << __func__); LOG_PRINT_L3("BlockchainLMDB::" << __func__);
check_open(); check_open();
tx_out_index ret;
mdb_txn_safe txn; mdb_txn_safe txn;
mdb_txn_safe* txn_ptr = &txn; mdb_txn_safe* txn_ptr = &txn;
if (m_batch_active) if (m_batch_active)
@ -1777,10 +1797,12 @@ tx_out_index BlockchainLMDB::get_output_tx_and_index_from_global(const uint64_t&
throw1(OUTPUT_DNE("output with given index not in db")); throw1(OUTPUT_DNE("output with given index not in db"));
else if (get_result) else if (get_result)
throw0(DB_ERROR("DB error attempting to fetch output tx index")); throw0(DB_ERROR("DB error attempting to fetch output tx index"));
ret = tx_out_index(tx_hash, *(const uint64_t *)v.mv_data);
if (! m_batch_active) if (! m_batch_active)
txn.commit(); txn.commit();
return tx_out_index(tx_hash, *(const uint64_t *)v.mv_data); return ret;
} }
tx_out_index BlockchainLMDB::get_output_tx_and_index(const uint64_t& amount, const uint64_t& index) tx_out_index BlockchainLMDB::get_output_tx_and_index(const uint64_t& amount, const uint64_t& index)
@ -2519,6 +2541,7 @@ uint64_t BlockchainLMDB::get_hard_fork_starting_height(uint8_t version) const
LOG_PRINT_L3("BlockchainLMDB::" << __func__); LOG_PRINT_L3("BlockchainLMDB::" << __func__);
check_open(); check_open();
uint64_t ret;
mdb_txn_safe txn; mdb_txn_safe txn;
mdb_txn_safe* txn_ptr = &txn; mdb_txn_safe* txn_ptr = &txn;
if (m_batch_active) if (m_batch_active)
@ -2538,9 +2561,10 @@ uint64_t BlockchainLMDB::get_hard_fork_starting_height(uint8_t version) const
if (result) if (result)
throw0(DB_ERROR("Error attempting to retrieve a hard fork starting height from the db")); throw0(DB_ERROR("Error attempting to retrieve a hard fork starting height from the db"));
ret = *(const uint64_t*)val_ret.mv_data;
if (!m_batch_active) if (!m_batch_active)
txn.commit(); txn.commit();
return *(const uint64_t*)val_ret.mv_data; return ret;
} }
void BlockchainLMDB::set_hard_fork_version(uint64_t height, uint8_t version) void BlockchainLMDB::set_hard_fork_version(uint64_t height, uint8_t version)
@ -2574,6 +2598,7 @@ uint8_t BlockchainLMDB::get_hard_fork_version(uint64_t height) const
LOG_PRINT_L3("BlockchainLMDB::" << __func__); LOG_PRINT_L3("BlockchainLMDB::" << __func__);
check_open(); check_open();
uint8_t ret;
mdb_txn_safe txn; mdb_txn_safe txn;
mdb_txn_safe* txn_ptr = &txn; mdb_txn_safe* txn_ptr = &txn;
if (m_batch_active) if (m_batch_active)
@ -2591,9 +2616,10 @@ uint8_t BlockchainLMDB::get_hard_fork_version(uint64_t height) const
if (result == MDB_NOTFOUND || result) if (result == MDB_NOTFOUND || result)
throw0(DB_ERROR("Error attempting to retrieve a hard fork version from the db")); throw0(DB_ERROR("Error attempting to retrieve a hard fork version from the db"));
ret = *(const uint8_t*)val_ret.mv_data;
if (!m_batch_active) if (!m_batch_active)
txn.commit(); txn.commit();
return *(const uint8_t*)val_ret.mv_data; return ret;
} }
void BlockchainLMDB::fixup() void BlockchainLMDB::fixup()