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/*
* This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
*
* 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 "Errors.h"
#include "Log.h"
#include "MySQLConnection.h"
#include "PreparedStatement.h"
#include "Timer.h"
#include <mysqld_error.h>
#include <sstream>
#include <thread>
#include <cstring>
std::mutex TransactionTask::_deadlockLock;
#define DEADLOCK_MAX_RETRY_TIME_MS 60000
//- Append a raw ad-hoc query to the transaction
void TransactionBase::Append(char const* sql)
{
ASSERT(sql);
m_queries.emplace_back(std::in_place_type<std::string>, sql);
}
//- Append a prepared statement to the transaction
void TransactionBase::AppendPreparedStatement(PreparedStatementBase* stmt)
{
ASSERT(stmt);
m_queries.emplace_back(std::in_place_type<std::unique_ptr<PreparedStatementBase>>, stmt);
}
void TransactionBase::Cleanup()
{
// This might be called by explicit calls to Cleanup or by the auto-destructor
if (_cleanedUp)
return;
m_queries.clear();
_cleanedUp = true;
}
bool TransactionTask::Execute(MySQLConnection* conn, std::shared_ptr<TransactionBase> trans)
{
int errorCode = TryExecute(conn, trans);
if (!errorCode)
return true;
if (errorCode == ER_LOCK_DEADLOCK)
{
std::string threadId = []()
{
// wrapped in lambda to fix false positive analysis warning C26115
std::ostringstream threadIdStream;
threadIdStream << std::this_thread::get_id();
return threadIdStream.str();
}();
// 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);
for (uint32 loopDuration = 0, startMSTime = getMSTime(); loopDuration <= DEADLOCK_MAX_RETRY_TIME_MS; loopDuration = GetMSTimeDiffToNow(startMSTime))
{
if (!TryExecute(conn, trans))
return true;
TC_LOG_WARN("sql.sql", "Deadlocked SQL Transaction, retrying. Loop timer: {} ms, Thread Id: {}", loopDuration, threadId);
}
TC_LOG_ERROR("sql.sql", "Fatal deadlocked SQL Transaction, it will not be retried anymore. Thread Id: {}", threadId);
}
// Clean up now.
trans->Cleanup();
return false;
}
int TransactionTask::TryExecute(MySQLConnection* conn, std::shared_ptr<TransactionBase> trans)
{
return conn->ExecuteTransaction(trans);
}
bool TransactionCallback::InvokeIfReady()
{
if (m_future.valid() && m_future.wait_for(std::chrono::seconds(0)) == std::future_status::ready)
{
m_callback(m_future.get());
return true;
}
return false;
}
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