Core/DBLayer: Implement async transaction completion callbacks

src/server/game/Server/WorldSession.cpp

@@ -244,7 +244,7 @@ void WorldSession::SendPacket(WorldPacket const* packet, bool forced /*= false*/
     {
         if (packet->GetConnection() != CONNECTION_TYPE_INSTANCE && IsInstanceOnlyOpcode(packet->GetOpcode()))
         {
-            TC_LOG_ERROR("network.opcode", "Prevented sending of instance only opcode %u with connection type %u to %s", packet->GetOpcode(), packet->GetConnection(), GetPlayerInfo().c_str());
+            TC_LOG_ERROR("network.opcode", "Prevented sending of instance only opcode %u with connection type %u to %s", packet->GetOpcode(), uint32(packet->GetConnection()), GetPlayerInfo().c_str());
             return;
         }
 
@@ -253,7 +253,7 @@ void WorldSession::SendPacket(WorldPacket const* packet, bool forced /*= false*/
 
     if (!m_Socket[conIdx])
     {
-        TC_LOG_ERROR("network.opcode", "Prevented sending of %s to non existent socket %u to %s", GetOpcodeNameForLogging(static_cast<OpcodeServer>(packet->GetOpcode())).c_str(), conIdx, GetPlayerInfo().c_str());
+        TC_LOG_ERROR("network.opcode", "Prevented sending of %s to non existent socket %u to %s", GetOpcodeNameForLogging(static_cast<OpcodeServer>(packet->GetOpcode())).c_str(), uint32(conIdx), GetPlayerInfo().c_str());
         return;
     }
 
@@ -1122,7 +1122,8 @@ void WorldSession::SetPlayer(Player* player)
 
 void WorldSession::ProcessQueryCallbacks()
 {
-    _queryProcessor.ProcessReadyQueries();
+    _queryProcessor.ProcessReadyCallbacks();
+    _transactionCallbacks.ProcessReadyCallbacks();
 
     if (_realmAccountLoginCallback.valid() && _realmAccountLoginCallback.wait_for(std::chrono::seconds(0)) == std::future_status::ready)
         InitializeSessionCallback(static_cast<LoginDatabaseQueryHolder*>(_realmAccountLoginCallback.get()));
@@ -1132,6 +1133,11 @@ void WorldSession::ProcessQueryCallbacks()
         HandlePlayerLogin(reinterpret_cast<LoginQueryHolder*>(_charLoginCallback.get()));
 }
 
+TransactionCallback& WorldSession::AddTransactionCallback(TransactionCallback&& callback)
+{
+    return _transactionCallbacks.AddCallback(std::move(callback));
+}
+
 void WorldSession::InitWarden(BigNumber* k, std::string const& os)
 {
     if (os == "Win")