start_read_only.c (1850B)
1 /* 2 This file is part of TALER 3 Copyright (C) 2022 Taler Systems SA 4 5 TALER is free software; you can redistribute it and/or modify it under the 6 terms of the GNU General Public License as published by the Free Software 7 Foundation; either version 3, or (at your option) any later version. 8 9 TALER is distributed in the hope that it will be useful, but WITHOUT ANY 10 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 11 A PARTICULAR PURPOSE. See the GNU General Public License for more details. 12 13 You should have received a copy of the GNU General Public License along with 14 TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/> 15 */ 16 /** 17 * @file exchangedb/start_read_only.c 18 * @brief Implementation of the start_read_only function for Postgres 19 * @author Christian Grothoff 20 */ 21 #include "exchange-database/start_read_only.h" 22 #include "exchange-database/preflight.h" 23 #include "helper.h" 24 25 enum GNUNET_GenericReturnValue 26 TALER_TALER_EXCHANGEDB_start_read_only (struct 27 TALER_EXCHANGEDB_PostgresContext *pg, 28 const char *name) 29 { 30 struct GNUNET_PQ_ExecuteStatement es[] = { 31 GNUNET_PQ_make_execute ( 32 "START TRANSACTION ISOLATION LEVEL SERIALIZABLE READ ONLY"), 33 GNUNET_PQ_EXECUTE_STATEMENT_END 34 }; 35 36 GNUNET_assert (NULL != name); 37 if (GNUNET_SYSERR == 38 TALER_EXCHANGEDB_preflight (pg)) 39 return GNUNET_SYSERR; 40 GNUNET_log (GNUNET_ERROR_TYPE_INFO, 41 "Starting READ ONLY transaction `%s`\n", 42 name); 43 if (GNUNET_OK != 44 GNUNET_PQ_exec_statements (pg->conn, 45 es)) 46 { 47 TALER_LOG_ERROR ("Failed to start transaction\n"); 48 GNUNET_break (0); 49 return GNUNET_SYSERR; 50 } 51 pg->transaction_name = name; 52 return GNUNET_OK; 53 }