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Base system with REST service to issue digital coins, run by the payment service provider
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select_purse_expired.c (4144B)

      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 src/auditordb/select_purse_expired.c
     18  * @brief Implementation of the select_purse_expired function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include "taler/taler_pq_lib.h"
     22 #include "auditor-database/select_purse_expired.h"
     23 #include "pg_helper.h"
     24 
     25 
     26 /**
     27  * Closure for #purse_expired_cb().
     28  */
     29 struct PurseExpiredContext
     30 {
     31 
     32   /**
     33    * Function to call for each expired purse.
     34    */
     35   TALER_AUDITORDB_ExpiredPurseCallback cb;
     36 
     37   /**
     38    * Closure for @e cb
     39    */
     40   void *cb_cls;
     41 
     42   /**
     43    * Plugin context.
     44    */
     45   struct TALER_AUDITORDB_PostgresContext *pg;
     46 
     47   /**
     48    * Query status to return.
     49    */
     50   enum GNUNET_DB_QueryStatus qs;
     51 };
     52 
     53 
     54 /**
     55  * Helper function for #TALER_AUDITORDB_select_purse_expired().
     56  * To be called with the results of a SELECT statement
     57  * that has returned @a num_results results.
     58  *
     59  * @param cls closure of type `struct PurseExpiredContext *`
     60  * @param result the postgres result
     61  * @param num_results the number of results in @a result
     62  */
     63 static void
     64 purse_expired_cb (void *cls,
     65                   PGresult *result,
     66                   unsigned int num_results)
     67 {
     68   struct PurseExpiredContext *eic = cls;
     69   struct TALER_AUDITORDB_PostgresContext *pg = eic->pg;
     70 
     71   for (unsigned int i = 0; i < num_results; i++)
     72   {
     73     struct TALER_PurseContractPublicKeyP purse_pub;
     74     struct GNUNET_TIME_Timestamp expiration_date;
     75     struct TALER_Amount balance;
     76     struct GNUNET_PQ_ResultSpec rs[] = {
     77       GNUNET_PQ_result_spec_auto_from_type ("purse_pub",
     78                                             &purse_pub),
     79       TALER_PQ_RESULT_SPEC_AMOUNT ("balance",
     80                                    &balance),
     81       GNUNET_PQ_result_spec_timestamp ("expiration_date",
     82                                        &expiration_date),
     83       GNUNET_PQ_result_spec_end
     84     };
     85 
     86     if (GNUNET_OK !=
     87         GNUNET_PQ_extract_result (result,
     88                                   rs,
     89                                   i))
     90     {
     91       GNUNET_break (0);
     92       eic->qs = GNUNET_DB_STATUS_HARD_ERROR;
     93       return;
     94     }
     95     eic->qs = i + 1;
     96     if (GNUNET_OK !=
     97         eic->cb (eic->cb_cls,
     98                  &purse_pub,
     99                  &balance,
    100                  expiration_date))
    101       break;
    102   }
    103 }
    104 
    105 
    106 enum GNUNET_DB_QueryStatus
    107 TALER_AUDITORDB_select_purse_expired (struct TALER_AUDITORDB_PostgresContext *pg
    108                                       ,
    109                                       TALER_AUDITORDB_ExpiredPurseCallback cb,
    110                                       void *cb_cls)
    111 {
    112   struct GNUNET_TIME_Timestamp now
    113     = GNUNET_TIME_timestamp_get ();
    114   struct GNUNET_PQ_QueryParam params[] = {
    115     GNUNET_PQ_query_param_timestamp (&now),
    116     GNUNET_PQ_query_param_end
    117   };
    118   struct PurseExpiredContext eic = {
    119     .cb = cb,
    120     .cb_cls = cb_cls,
    121     .pg = pg
    122   };
    123   enum GNUNET_DB_QueryStatus qs;
    124 
    125   PREPARE (pg,
    126            "auditor_select_expired_purses",
    127            "SELECT"
    128            " purse_pub"
    129            ",expiration_date"
    130            ",balance"
    131            " FROM auditor_purses"
    132            " WHERE expiration_date<$1;");
    133   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    134                                              "auditor_select_expired_purses",
    135                                              params,
    136                                              &purse_expired_cb,
    137                                              &eic);
    138   if (qs > 0)
    139     return eic.qs;
    140   GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR != qs);
    141   return qs;
    142 }