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Base system with REST service to issue digital coins, run by the payment service provider
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pg_get_purses.c (4455B)

      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_error_codes.h"
     18 #include "taler/taler_dbevents.h"
     19 #include "taler/taler_pq_lib.h"
     20 #include "pg_helper.h"
     21 #include "pg_get_purses.h"
     22 
     23 
     24 struct PursesContext
     25 {
     26 
     27   /**
     28    * Function to call for each bad sig loss.
     29    */
     30   TALER_AUDITORDB_PursesCallback cb;
     31 
     32   /**
     33    * Closure for @e cb
     34    */
     35   void *cb_cls;
     36 
     37   /**
     38    * Plugin context.
     39    */
     40   struct PostgresClosure *pg;
     41 
     42   /**
     43    * Query status to return.
     44    */
     45   enum GNUNET_DB_QueryStatus qs;
     46 };
     47 
     48 
     49 /**
     50  * Helper function for #TAH_PG_get_purses().
     51  * To be called with the results of a SELECT statement
     52  * that has returned @a num_results results.
     53  *
     54  * @param cls closure of type `struct PursesContext *`
     55  * @param result the postgres result
     56  * @param num_results the number of results in @a result
     57  */
     58 static void
     59 purses_cb (void *cls,
     60            PGresult *result,
     61            unsigned int num_results)
     62 {
     63   struct PursesContext *dcc = cls;
     64   struct PostgresClosure *pg = dcc->pg;
     65 
     66   for (unsigned int i = 0; i < num_results; i++)
     67   {
     68     struct TALER_AUDITORDB_Purses dc;
     69     struct GNUNET_PQ_ResultSpec rs[] = {
     70       GNUNET_PQ_result_spec_uint64 ("auditor_purses_rowid",
     71                                     &dc.auditor_purses_rowid),
     72       GNUNET_PQ_result_spec_auto_from_type ("purse_pub",
     73                                             &dc.purse_pub),
     74       TALER_PQ_RESULT_SPEC_AMOUNT ("balance",
     75                                    &dc.balance),
     76       TALER_PQ_RESULT_SPEC_AMOUNT ("target",
     77                                    &dc.target),
     78       GNUNET_PQ_result_spec_absolute_time ("expiration_date",
     79                                            &dc.expiration_date),
     80       GNUNET_PQ_result_spec_end
     81     };
     82     enum GNUNET_GenericReturnValue rval;
     83 
     84     if (GNUNET_OK !=
     85         GNUNET_PQ_extract_result (result,
     86                                   rs,
     87                                   i))
     88     {
     89       GNUNET_break (0);
     90       dcc->qs = GNUNET_DB_STATUS_HARD_ERROR;
     91       return;
     92     }
     93     dcc->qs = i + 1;
     94     rval = dcc->cb (dcc->cb_cls,
     95                     dc.auditor_purses_rowid,
     96                     &dc);
     97     GNUNET_PQ_cleanup_result (rs);
     98     if (GNUNET_OK != rval)
     99       break;
    100   }
    101 }
    102 
    103 
    104 enum GNUNET_DB_QueryStatus
    105 TAH_PG_get_purses (
    106   void *cls,
    107   int64_t limit,
    108   uint64_t offset,
    109   TALER_AUDITORDB_PursesCallback cb,
    110   void *cb_cls)
    111 {
    112   struct PostgresClosure *pg = cls;
    113   uint64_t plimit = (uint64_t) ((limit < 0) ? -limit : limit);
    114   struct GNUNET_PQ_QueryParam params[] = {
    115     GNUNET_PQ_query_param_uint64 (&offset),
    116     GNUNET_PQ_query_param_uint64 (&plimit),
    117     GNUNET_PQ_query_param_end
    118   };
    119   struct PursesContext dcc = {
    120     .cb = cb,
    121     .cb_cls = cb_cls,
    122     .pg = pg
    123   };
    124   enum GNUNET_DB_QueryStatus qs;
    125 
    126   PREPARE (pg,
    127            "auditor_purses_get_desc",
    128            "SELECT"
    129            " auditor_purses_rowid,"
    130            " purse_pub,"
    131            " balance,"
    132            " target,"
    133            " expiration_date"
    134            " FROM auditor_purses"
    135            " WHERE (auditor_purses_rowid < $1)"
    136            " ORDER BY auditor_purses_rowid DESC"
    137            " LIMIT $2"
    138            );
    139   PREPARE (pg,
    140            "auditor_purses_get_asc",
    141            "SELECT"
    142            " auditor_purses_rowid,"
    143            " purse_pub,"
    144            " balance,"
    145            " target,"
    146            " expiration_date"
    147            " FROM auditor_purses"
    148            " WHERE (auditor_purses_rowid > $1)"
    149            " ORDER BY auditor_purses_rowid ASC"
    150            " LIMIT $2"
    151            );
    152   qs = GNUNET_PQ_eval_prepared_multi_select (
    153     pg->conn,
    154     (limit > 0)
    155     ? "auditor_purses_get_asc"
    156     : "auditor_purses_get_desc",
    157     params,
    158     &purses_cb,
    159     &dcc);
    160 
    161   if (qs > 0)
    162     return dcc.qs;
    163   GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR != qs);
    164   return qs;
    165 }