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Base system with REST service to issue digital coins, run by the payment service provider
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pg_delete_generic.c (2534B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2024 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 #include "taler/platform.h"
     17 #include "taler/taler_pq_lib.h"
     18 #include "pg_helper.h"
     19 #include "pg_delete_generic.h"
     20 
     21 struct Preparations
     22 {
     23   /**
     24    * Database reconnect counter.
     25    */
     26   unsigned long long cnt;
     27 
     28   /**
     29    * Which DB did we do prepare for.
     30    */
     31   struct PostgresClosure *pg;
     32 
     33 };
     34 
     35 enum GNUNET_DB_QueryStatus
     36 TAH_PG_delete_generic (
     37   void *cls,
     38   enum TALER_AUDITORDB_DeletableSuppressableTables table,
     39   uint64_t row_id)
     40 {
     41   struct PostgresClosure *pg = cls;
     42   struct GNUNET_PQ_QueryParam params[] = {
     43     GNUNET_PQ_query_param_uint64 (&row_id),
     44     GNUNET_PQ_query_param_end
     45   };
     46   static struct Preparations preps[
     47     TALER_AUDITORDB_DELETABLESUPPRESSABLE_TABLES_MAX];
     48 
     49   struct Preparations *prep = &preps[table];
     50   const char *table_name = TAH_PG_get_deletable_suppressable_table_name (table);
     51   char statement_name[256];
     52 
     53   GNUNET_snprintf (statement_name,
     54                    sizeof (statement_name),
     55                    "delete_%s",
     56                    table_name);
     57   if ( (pg != prep->pg) ||
     58        (prep->cnt < pg->prep_gen) )
     59   {
     60     char sql[256];
     61     struct GNUNET_PQ_PreparedStatement ps[] = {
     62       GNUNET_PQ_make_prepare (statement_name,
     63                               sql),
     64       GNUNET_PQ_PREPARED_STATEMENT_END
     65     };
     66 
     67     GNUNET_snprintf (sql,
     68                      sizeof (sql),
     69                      "DELETE FROM %s"
     70                      " WHERE row_id=$1",
     71                      table_name);
     72     if (GNUNET_OK !=
     73         GNUNET_PQ_prepare_statements (pg->conn,
     74                                       ps))
     75     {
     76       GNUNET_break (0);
     77       return GNUNET_DB_STATUS_HARD_ERROR;
     78     }
     79     prep->pg = pg;
     80     prep->cnt = pg->prep_gen;
     81   }
     82   return GNUNET_PQ_eval_prepared_non_select (pg->conn,
     83                                              statement_name,
     84                                              params);
     85 }