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Fix use of rtxn without a mdb_txn_safe wrapper

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This commit is contained in:
Howard Chu 2022-06-07 20:27:11 +01:00
parent b6a029f222
commit c0f3c5b577
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GPG key ID: FD2A70B44AB11BA7
2 changed files with 55 additions and 47 deletions
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16
src/blockchain_db/blockchain_db.h
View file

@ -1883,16 +1883,18 @@ public:
}
virtual ~db_txn_guard()
{
if (active)
stop();
stop();
}
void stop()
{
if (readonly)
db->block_rtxn_stop();
else
db->block_wtxn_stop();
active = false;
if (active)
{
if (readonly)
db->block_rtxn_stop();
else
db->block_wtxn_stop();
active = false;
}
}
void abort()
{

86
src/blockchain_db/lmdb/db_lmdb.cpp
View file

@ -465,6 +465,32 @@ void mdb_txn_safe::increment_txns(int i)
num_active_txns += i;
}
#define TXN_PREFIX(flags); \
mdb_txn_safe auto_txn; \
mdb_txn_safe* txn_ptr = &auto_txn; \
if (m_batch_active) \
txn_ptr = m_write_txn; \
else \
{ \
if (auto mdb_res = lmdb_txn_begin(m_env, NULL, flags, auto_txn)) \
throw0(DB_ERROR(lmdb_error(std::string("Failed to create a transaction for the db in ")+__FUNCTION__+": ", mdb_res).c_str())); \
} \
#define TXN_PREFIX_RDONLY() \
MDB_txn *m_txn; \
mdb_txn_cursors *m_cursors; \
mdb_txn_safe auto_txn; \
bool my_rtxn = block_rtxn_start(&m_txn, &m_cursors); \
if (my_rtxn) auto_txn.m_tinfo = m_tinfo.get(); \
else auto_txn.uncheck()
#define TXN_POSTFIX_RDONLY()
#define TXN_POSTFIX_SUCCESS() \
do { \
if (! m_batch_active) \
auto_txn.commit(); \
} while(0)
void lmdb_resized(MDB_env *env, int isactive)
{
mdb_txn_safe::prevent_new_txns();
@ -713,21 +739,20 @@ uint64_t BlockchainLMDB::get_estimated_batch_size(uint64_t batch_num_blocks, uin
}
else
{
MDB_txn *rtxn;
mdb_txn_cursors *rcurs;
bool my_rtxn = block_rtxn_start(&rtxn, &rcurs);
for (uint64_t block_num = block_start; block_num <= block_stop; ++block_num)
{
// we have access to block weight, which will be greater or equal to block size,
// so use this as a proxy. If it's too much off, we might have to check actual size,
// which involves reading more data, so is not really wanted
size_t block_weight = get_block_weight(block_num);
total_block_size += block_weight;
// Track number of blocks being totalled here instead of assuming, in case
// some blocks were to be skipped for being outliers.
++num_blocks_used;
TXN_PREFIX_RDONLY();
for (uint64_t block_num = block_start; block_num <= block_stop; ++block_num)
{
// we have access to block weight, which will be greater or equal to block size,
// so use this as a proxy. If it's too much off, we might have to check actual size,
// which involves reading more data, so is not really wanted
size_t block_weight = get_block_weight(block_num);
total_block_size += block_weight;
// Track number of blocks being totalled here instead of assuming, in case
// some blocks were to be skipped for being outliers.
++num_blocks_used;
}
}
if (my_rtxn) block_rtxn_stop();
avg_block_size = total_block_size / (num_blocks_used ? num_blocks_used : 1);
MDEBUG("average block size across recent " << num_blocks_used << " blocks: " << avg_block_size);
}
@ -1678,32 +1703,6 @@ void BlockchainLMDB::unlock()
check_open();
}
#define TXN_PREFIX(flags); \
mdb_txn_safe auto_txn; \
mdb_txn_safe* txn_ptr = &auto_txn; \
if (m_batch_active) \
txn_ptr = m_write_txn; \
else \
{ \
if (auto mdb_res = lmdb_txn_begin(m_env, NULL, flags, auto_txn)) \
throw0(DB_ERROR(lmdb_error(std::string("Failed to create a transaction for the db in ")+__FUNCTION__+": ", mdb_res).c_str())); \
} \
#define TXN_PREFIX_RDONLY() \
MDB_txn *m_txn; \
mdb_txn_cursors *m_cursors; \
mdb_txn_safe auto_txn; \
bool my_rtxn = block_rtxn_start(&m_txn, &m_cursors); \
if (my_rtxn) auto_txn.m_tinfo = m_tinfo.get(); \
else auto_txn.uncheck()
#define TXN_POSTFIX_RDONLY()
#define TXN_POSTFIX_SUCCESS() \
do { \
if (! m_batch_active) \
auto_txn.commit(); \
} while(0)
// The below two macros are for DB access within block add/remove, whether
// regular batch txn is in use or not. m_write_txn is used as a batch txn, even
@ -3923,13 +3922,20 @@ void BlockchainLMDB::block_rtxn_stop() const
LOG_PRINT_L3("BlockchainLMDB::" << __func__);
mdb_txn_reset(m_tinfo->m_ti_rtxn);
memset(&m_tinfo->m_ti_rflags, 0, sizeof(m_tinfo->m_ti_rflags));
/* cancel out the increment from rtxn_start */
mdb_txn_safe::increment_txns(-1);
}
bool BlockchainLMDB::block_rtxn_start() const
{
MDB_txn *mtxn;
mdb_txn_cursors *mcur;
return block_rtxn_start(&mtxn, &mcur);
/* auto_txn is only used for the create gate */
mdb_txn_safe auto_txn;
bool ret = block_rtxn_start(&mtxn, &mcur);
if (ret)
auto_txn.increment_txns(1); /* remember there is an active readtxn */
return ret;
}
void BlockchainLMDB::block_wtxn_start()