Line data    Source code

       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/pg_start_read_only.c
      18              :  * @brief Implementation of the start_read_only function for Postgres
      19              :  * @author Christian Grothoff
      20              :  */
      21              : #include "taler/platform.h"
      22              : #include "taler/taler_error_codes.h"
      23              : #include "taler/taler_dbevents.h"
      24              : #include "taler/taler_pq_lib.h"
      25              : #include "pg_start_read_only.h"
      26              : #include "pg_preflight.h"
      27              : #include "pg_helper.h"
      28              : 
      29              : enum GNUNET_GenericReturnValue
      30            0 : TEH_PG_start_read_only (void *cls,
      31              :                         const char *name)
      32              : {
      33            0 :   struct PostgresClosure *pg = cls;
      34            0 :   struct GNUNET_PQ_ExecuteStatement es[] = {
      35            0 :     GNUNET_PQ_make_execute (
      36              :       "START TRANSACTION ISOLATION LEVEL SERIALIZABLE READ ONLY"),
      37              :     GNUNET_PQ_EXECUTE_STATEMENT_END
      38              :   };
      39              : 
      40            0 :   GNUNET_assert (NULL != name);
      41            0 :   if (GNUNET_SYSERR ==
      42            0 :       TEH_PG_preflight (pg))
      43            0 :     return GNUNET_SYSERR;
      44            0 :   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
      45              :               "Starting READ ONLY transaction `%s`\n",
      46              :               name);
      47            0 :   if (GNUNET_OK !=
      48            0 :       GNUNET_PQ_exec_statements (pg->conn,
      49              :                                  es))
      50              :   {
      51            0 :     TALER_LOG_ERROR ("Failed to start transaction\n");
      52            0 :     GNUNET_break (0);
      53            0 :     return GNUNET_SYSERR;
      54              :   }
      55            0 :   pg->transaction_name = name;
      56            0 :   return GNUNET_OK;
      57              : }