1 files changed, 87 insertions, 0 deletions
diff --git a/src/server/database/Database/Transaction.cpp b/src/server/database/Database/Transaction.cpp
new file mode 100644
index 00000000000..f657411f716
--- /dev/null
+++ b/src/server/database/Database/Transaction.cpp
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2008-2015 TrinityCore <http://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 "DatabaseEnv.h"
+#include "Transaction.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;
+
+    while (!m_queries.empty())
+    {
+        SQLElementData const &data = m_queries.front();
+        switch (data.type)
+        {
+            case SQL_ELEMENT_PREPARED:
+                delete data.element.stmt;
+            break;
+            case SQL_ELEMENT_RAW:
+                free((void*)(data.element.query));
+            break;
+        }
+
+        m_queries.pop_front();
+    }
+
+    _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;
+}