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/*
* Copyright (C) 2008-2018 TrinityCore <https://www.trinitycore.org/>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Transaction.h"
#include "MySQLConnection.h"
#include "PreparedStatement.h"
#include <mysqld_error.h>
std::mutex TransactionTask::_deadlockLock;
//- Append a raw ad-hoc query to the transaction
void Transaction::Append(const char* sql)
{
SQLElementData data;
data.type = SQL_ELEMENT_RAW;
data.element.query = strdup(sql);
m_queries.push_back(data);
}
//- Append a prepared statement to the transaction
void Transaction::Append(PreparedStatement* stmt)
{
SQLElementData data;
data.type = SQL_ELEMENT_PREPARED;
data.element.stmt = stmt;
m_queries.push_back(data);
}
void Transaction::Cleanup()
{
// This might be called by explicit calls to Cleanup or by the auto-destructor
if (_cleanedUp)
return;
for (SQLElementData const &data : m_queries)
{
switch (data.type)
{
case SQL_ELEMENT_PREPARED:
delete data.element.stmt;
break;
case SQL_ELEMENT_RAW:
free((void*)(data.element.query));
break;
}
}
m_queries.clear();
_cleanedUp = true;
}
bool TransactionTask::Execute()
{
int errorCode = m_conn->ExecuteTransaction(m_trans);
if (!errorCode)
return true;
if (errorCode == ER_LOCK_DEADLOCK)
{
// Make sure only 1 async thread retries a transaction so they don't keep dead-locking each other
std::lock_guard<std::mutex> lock(_deadlockLock);
uint8 loopBreaker = 5; // Handle MySQL Errno 1213 without extending deadlock to the core itself
for (uint8 i = 0; i < loopBreaker; ++i)
if (!m_conn->ExecuteTransaction(m_trans))
return true;
}
// Clean up now.
m_trans->Cleanup();
return false;
}
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