exchange

Base system with REST service to issue digital coins, run by the payment service provider
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get_purses.c (4518B)

      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/taler_pq_lib.h"
     17 #include "pg_helper.h"
     18 #include "auditor-database/get_purses.h"
     19 
     20 
     21 struct PursesContext
     22 {
     23 
     24   /**
     25    * Function to call for each bad sig loss.
     26    */
     27   TALER_AUDITORDB_PursesCallback cb;
     28 
     29   /**
     30    * Closure for @e cb
     31    */
     32   void *cb_cls;
     33 
     34   /**
     35    * Plugin context.
     36    */
     37   struct TALER_AUDITORDB_PostgresContext *pg;
     38 
     39   /**
     40    * Query status to return.
     41    */
     42   enum GNUNET_DB_QueryStatus qs;
     43 };
     44 
     45 
     46 /**
     47  * Helper function for #TALER_AUDITORDB_get_purses().
     48  * To be called with the results of a SELECT statement
     49  * that has returned @a num_results results.
     50  *
     51  * @param cls closure of type `struct PursesContext *`
     52  * @param result the postgres result
     53  * @param num_results the number of results in @a result
     54  */
     55 static void
     56 purses_cb (void *cls,
     57            PGresult *result,
     58            unsigned int num_results)
     59 {
     60   struct PursesContext *dcc = cls;
     61   struct TALER_AUDITORDB_PostgresContext *pg = dcc->pg;
     62 
     63   for (unsigned int i = 0; i < num_results; i++)
     64   {
     65     struct TALER_AUDITORDB_Purses dc;
     66     struct GNUNET_PQ_ResultSpec rs[] = {
     67       GNUNET_PQ_result_spec_uint64 ("auditor_purses_rowid",
     68                                     &dc.auditor_purses_rowid),
     69       GNUNET_PQ_result_spec_auto_from_type ("purse_pub",
     70                                             &dc.purse_pub),
     71       TALER_PQ_RESULT_SPEC_AMOUNT ("balance",
     72                                    &dc.balance),
     73       TALER_PQ_RESULT_SPEC_AMOUNT ("target",
     74                                    &dc.target),
     75       GNUNET_PQ_result_spec_absolute_time ("expiration_date",
     76                                            &dc.expiration_date),
     77       GNUNET_PQ_result_spec_end
     78     };
     79     enum GNUNET_GenericReturnValue rval;
     80 
     81     if (GNUNET_OK !=
     82         GNUNET_PQ_extract_result (result,
     83                                   rs,
     84                                   i))
     85     {
     86       GNUNET_break (0);
     87       dcc->qs = GNUNET_DB_STATUS_HARD_ERROR;
     88       return;
     89     }
     90     dcc->qs = i + 1;
     91     rval = dcc->cb (dcc->cb_cls,
     92                     dc.auditor_purses_rowid,
     93                     &dc);
     94     GNUNET_PQ_cleanup_result (rs);
     95     if (GNUNET_OK != rval)
     96       break;
     97   }
     98 }
     99 
    100 
    101 enum GNUNET_DB_QueryStatus
    102 TALER_AUDITORDB_get_purses (struct TALER_AUDITORDB_PostgresContext *pg,
    103                             int64_t limit,
    104                             uint64_t offset,
    105                             TALER_AUDITORDB_PursesCallback cb,
    106                             void *cb_cls)
    107 {
    108   uint64_t plimit = (uint64_t) ((limit < 0) ? -limit : limit);
    109   struct GNUNET_PQ_QueryParam params[] = {
    110     GNUNET_PQ_query_param_uint64 (&offset),
    111     GNUNET_PQ_query_param_uint64 (&plimit),
    112     GNUNET_PQ_query_param_end
    113   };
    114   struct PursesContext dcc = {
    115     .cb = cb,
    116     .cb_cls = cb_cls,
    117     .pg = pg
    118   };
    119   enum GNUNET_DB_QueryStatus qs;
    120 
    121   PREPARE (pg,
    122            "auditor_purses_get_desc",
    123            "SELECT"
    124            " auditor_purses_rowid,"
    125            " purse_pub,"
    126            " balance,"
    127            " target,"
    128            " expiration_date"
    129            " FROM auditor_purses"
    130            " WHERE (auditor_purses_rowid < $1)"
    131            " ORDER BY auditor_purses_rowid DESC"
    132            " LIMIT $2"
    133            );
    134   PREPARE (pg,
    135            "auditor_purses_get_asc",
    136            "SELECT"
    137            " auditor_purses_rowid,"
    138            " purse_pub,"
    139            " balance,"
    140            " target,"
    141            " expiration_date"
    142            " FROM auditor_purses"
    143            " WHERE (auditor_purses_rowid > $1)"
    144            " ORDER BY auditor_purses_rowid ASC"
    145            " LIMIT $2"
    146            );
    147   qs = GNUNET_PQ_eval_prepared_multi_select (
    148     pg->conn,
    149     (limit > 0)
    150     ? "auditor_purses_get_asc"
    151     : "auditor_purses_get_desc",
    152     params,
    153     &purses_cb,
    154     &dcc);
    155 
    156   if (qs > 0)
    157     return dcc.qs;
    158   GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR != qs);
    159   return qs;
    160 }