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Base system with REST service to issue digital coins, run by the payment service provider
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pg_select_purse_expired.c (4073B)

      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 auditordb/pg_select_purse_expired.c
     18  * @brief Implementation of the select_purse_expired function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include "taler/platform.h"
     22 #include "taler/taler_error_codes.h"
     23 #include "taler/taler_dbevents.h"
     24 #include "taler/taler_pq_lib.h"
     25 #include "pg_select_purse_expired.h"
     26 #include "pg_helper.h"
     27 
     28 
     29 /**
     30  * Closure for #purse_expired_cb().
     31  */
     32 struct PurseExpiredContext
     33 {
     34 
     35   /**
     36    * Function to call for each expired purse.
     37    */
     38   TALER_AUDITORDB_ExpiredPurseCallback cb;
     39 
     40   /**
     41    * Closure for @e cb
     42    */
     43   void *cb_cls;
     44 
     45   /**
     46    * Plugin context.
     47    */
     48   struct PostgresClosure *pg;
     49 
     50   /**
     51    * Query status to return.
     52    */
     53   enum GNUNET_DB_QueryStatus qs;
     54 };
     55 
     56 
     57 /**
     58  * Helper function for #TAH_PG_select_purse_expired().
     59  * To be called with the results of a SELECT statement
     60  * that has returned @a num_results results.
     61  *
     62  * @param cls closure of type `struct PurseExpiredContext *`
     63  * @param result the postgres result
     64  * @param num_results the number of results in @a result
     65  */
     66 static void
     67 purse_expired_cb (void *cls,
     68                   PGresult *result,
     69                   unsigned int num_results)
     70 {
     71   struct PurseExpiredContext *eic = cls;
     72   struct PostgresClosure *pg = eic->pg;
     73 
     74   for (unsigned int i = 0; i < num_results; i++)
     75   {
     76     struct TALER_PurseContractPublicKeyP purse_pub;
     77     struct GNUNET_TIME_Timestamp expiration_date;
     78     struct TALER_Amount balance;
     79     struct GNUNET_PQ_ResultSpec rs[] = {
     80       GNUNET_PQ_result_spec_auto_from_type ("purse_pub",
     81                                             &purse_pub),
     82       TALER_PQ_RESULT_SPEC_AMOUNT ("balance",
     83                                    &balance),
     84       GNUNET_PQ_result_spec_timestamp ("expiration_date",
     85                                        &expiration_date),
     86       GNUNET_PQ_result_spec_end
     87     };
     88 
     89     if (GNUNET_OK !=
     90         GNUNET_PQ_extract_result (result,
     91                                   rs,
     92                                   i))
     93     {
     94       GNUNET_break (0);
     95       eic->qs = GNUNET_DB_STATUS_HARD_ERROR;
     96       return;
     97     }
     98     eic->qs = i + 1;
     99     if (GNUNET_OK !=
    100         eic->cb (eic->cb_cls,
    101                  &purse_pub,
    102                  &balance,
    103                  expiration_date))
    104       break;
    105   }
    106 }
    107 
    108 
    109 enum GNUNET_DB_QueryStatus
    110 TAH_PG_select_purse_expired (
    111   void *cls,
    112   TALER_AUDITORDB_ExpiredPurseCallback cb,
    113   void *cb_cls)
    114 {
    115   struct PostgresClosure *pg = cls;
    116   struct GNUNET_TIME_Timestamp now
    117     = GNUNET_TIME_timestamp_get ();
    118   struct GNUNET_PQ_QueryParam params[] = {
    119     GNUNET_PQ_query_param_timestamp (&now),
    120     GNUNET_PQ_query_param_end
    121   };
    122   struct PurseExpiredContext eic = {
    123     .cb = cb,
    124     .cb_cls = cb_cls,
    125     .pg = pg
    126   };
    127   enum GNUNET_DB_QueryStatus qs;
    128 
    129   PREPARE (pg,
    130            "auditor_select_expired_purses",
    131            "SELECT"
    132            " purse_pub"
    133            ",expiration_date"
    134            ",balance"
    135            " FROM auditor_purses"
    136            " WHERE expiration_date<$1;");
    137   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    138                                              "auditor_select_expired_purses",
    139                                              params,
    140                                              &purse_expired_cb,
    141                                              &eic);
    142   if (qs > 0)
    143     return eic.qs;
    144   GNUNET_break (GNUNET_DB_STATUS_HARD_ERROR != qs);
    145   return qs;
    146 }