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pg_start_read_only.c (1869B)

      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 donaudb/pg_start_read_only.c
     18  * @brief Implementation of the start_read_only function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include <donau_config.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 DH_PG_start_read_only (void *cls,
     31                        const char *name)
     32 {
     33   struct PostgresClosure *pg = cls;
     34   struct GNUNET_PQ_ExecuteStatement es[] = {
     35     GNUNET_PQ_make_execute (
     36       "START TRANSACTION ISOLATION LEVEL SERIALIZABLE READ ONLY"),
     37     GNUNET_PQ_EXECUTE_STATEMENT_END
     38   };
     39 
     40   GNUNET_assert (NULL != name);
     41   if (GNUNET_SYSERR ==
     42       DH_PG_preflight (pg))
     43     return GNUNET_SYSERR;
     44   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
     45               "Starting READ ONLY transaction `%s`\n",
     46               name);
     47   if (GNUNET_OK !=
     48       GNUNET_PQ_exec_statements (pg->conn,
     49                                  es))
     50   {
     51     TALER_LOG_ERROR ("Failed to start transaction\n");
     52     GNUNET_break (0);
     53     return GNUNET_SYSERR;
     54   }
     55   pg->transaction_name = name;
     56   return GNUNET_OK;
     57 }