exchange

Base system with REST service to issue digital coins, run by the payment service provider
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iterate_reserve_close_info.c (4103B)

      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 iterate_reserve_close_info.c
     18  * @brief Low-level (statement-level) Postgres database access for the exchange
     19  * @author Christian Grothoff
     20  */
     21 #include "taler/taler_pq_lib.h"
     22 #include "exchange-database/iterate_reserve_close_info.h"
     23 #include "helper.h"
     24 
     25 /**
     26  * Closure for #iterate_reserve_close_info_cb()
     27  */
     28 struct IteratorContext
     29 {
     30   /**
     31    * Function to call with the results.
     32    */
     33   TALER_KYCLOGIC_KycAmountCallback cb;
     34 
     35   /**
     36    * Closure to pass to @e cb
     37    */
     38   void *cb_cls;
     39 
     40   /**
     41    * Plugin context.
     42    */
     43   struct TALER_EXCHANGEDB_PostgresContext *pg;
     44 
     45   /**
     46    * Flag set to #GNUNET_OK as long as everything is fine.
     47    */
     48   enum GNUNET_GenericReturnValue status;
     49 };
     50 
     51 
     52 /**
     53  * Helper function for #TALER_EXCHANGEDB_iterate_reserve_close_info().
     54  * Calls the callback with each denomination key.
     55  *
     56  * @param cls a `struct IteratorContext`
     57  * @param result db results
     58  * @param num_results number of results in @a result
     59  */
     60 static void
     61 iterate_reserve_close_info_cb (void *cls,
     62                                PGresult *result,
     63                                unsigned int num_results)
     64 {
     65   struct IteratorContext *ic = cls;
     66   struct TALER_EXCHANGEDB_PostgresContext *pg = ic->pg;
     67 
     68   for (unsigned int i = 0; i<num_results; i++)
     69   {
     70     struct TALER_Amount amount;
     71     struct GNUNET_TIME_Absolute ts;
     72     struct GNUNET_PQ_ResultSpec rs[] = {
     73       GNUNET_PQ_result_spec_absolute_time ("execution_date",
     74                                            &ts),
     75       TALER_PQ_RESULT_SPEC_AMOUNT ("amount",
     76                                    &amount),
     77       GNUNET_PQ_result_spec_end
     78     };
     79     enum GNUNET_GenericReturnValue ret;
     80 
     81     if (GNUNET_OK !=
     82         GNUNET_PQ_extract_result (result,
     83                                   rs,
     84                                   i))
     85     {
     86       GNUNET_break (0);
     87       ic->status = GNUNET_SYSERR;
     88       return;
     89     }
     90     ret = ic->cb (ic->cb_cls,
     91                   &amount,
     92                   ts);
     93     switch (ret)
     94     {
     95     case GNUNET_OK:
     96       continue;
     97     case GNUNET_NO:
     98       break;
     99     case GNUNET_SYSERR:
    100       ic->status = GNUNET_SYSERR;
    101       break;
    102     }
    103     break;
    104   }
    105 }
    106 
    107 
    108 enum GNUNET_DB_QueryStatus
    109 TALER_EXCHANGEDB_iterate_reserve_close_info (
    110   struct TALER_EXCHANGEDB_PostgresContext *pg,
    111   const struct TALER_NormalizedPaytoHashP *h_payto,
    112   struct GNUNET_TIME_Absolute time_limit,
    113   TALER_KYCLOGIC_KycAmountCallback kac,
    114   void *kac_cls)
    115 {
    116   struct GNUNET_PQ_QueryParam params[] = {
    117     GNUNET_PQ_query_param_auto_from_type (h_payto),
    118     GNUNET_PQ_query_param_absolute_time (&time_limit),
    119     GNUNET_PQ_query_param_end
    120   };
    121   struct IteratorContext ic = {
    122     .cb = kac,
    123     .cb_cls = kac_cls,
    124     .pg = pg,
    125     .status = GNUNET_OK
    126   };
    127   enum GNUNET_DB_QueryStatus qs;
    128 
    129   PREPARE (pg,
    130            "iterate_reserve_close_info",
    131            "SELECT amount"
    132            "      ,execution_date"
    133            "  FROM reserves_close"
    134            " WHERE wire_target_h_payto IN ("
    135            "   SELECT wire_target_h_payto"
    136            "     FROM wire_targets"
    137            "    WHERE h_normalized_payto=$1"
    138            "   )"
    139            "   AND execution_date >= $2"
    140            " ORDER BY execution_date DESC");
    141   qs = GNUNET_PQ_eval_prepared_multi_select (
    142     pg->conn,
    143     "iterate_reserve_close_info",
    144     params,
    145     &iterate_reserve_close_info_cb,
    146     &ic);
    147   if (GNUNET_OK != ic.status)
    148     return GNUNET_DB_STATUS_HARD_ERROR;
    149   return qs;
    150 }