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Base system with REST service to issue digital coins, run by the payment service provider
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select_aggregation_amounts_for_kyc_check.c (4133B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2022, 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 /**
     17  * @file exchangedb/select_aggregation_amounts_for_kyc_check.c
     18  * @brief Implementation of the select_aggregation_amounts_for_kyc_check function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include "taler/taler_pq_lib.h"
     22 #include "exchange-database/select_aggregation_amounts_for_kyc_check.h"
     23 #include "helper.h"
     24 
     25 
     26 /**
     27  * Closure for #get_kyc_amounts_cb().
     28  */
     29 struct KycAmountCheckContext
     30 {
     31   /**
     32    * Function to call per result.
     33    */
     34   TALER_KYCLOGIC_KycAmountCallback cb;
     35 
     36   /**
     37    * Closure for @e cb.
     38    */
     39   void *cb_cls;
     40 
     41   /**
     42    * Plugin context.
     43    */
     44   struct TALER_EXCHANGEDB_PostgresContext *pg;
     45 
     46   /**
     47    * Flag set to #GNUNET_OK as long as everything is fine.
     48    */
     49   enum GNUNET_GenericReturnValue status;
     50 
     51 };
     52 
     53 
     54 /**
     55  * Invoke the callback for each result.
     56  *
     57  * @param cls a `struct KycAmountCheckContext *`
     58  * @param result SQL result
     59  * @param num_results number of rows in @a result
     60  */
     61 static void
     62 get_kyc_amounts_cb (void *cls,
     63                     PGresult *result,
     64                     unsigned int num_results)
     65 {
     66   struct KycAmountCheckContext *ctx = cls;
     67   struct TALER_EXCHANGEDB_PostgresContext *pg = ctx->pg;
     68 
     69   for (unsigned int i = 0; i < num_results; i++)
     70   {
     71     struct GNUNET_TIME_Absolute date;
     72     struct TALER_Amount amount;
     73     struct GNUNET_PQ_ResultSpec rs[] = {
     74       TALER_PQ_RESULT_SPEC_AMOUNT ("amount",
     75                                    &amount),
     76       GNUNET_PQ_result_spec_absolute_time ("date",
     77                                            &date),
     78       GNUNET_PQ_result_spec_end
     79     };
     80     enum GNUNET_GenericReturnValue ret;
     81 
     82     if (GNUNET_OK !=
     83         GNUNET_PQ_extract_result (result,
     84                                   rs,
     85                                   i))
     86     {
     87       GNUNET_break (0);
     88       ctx->status = GNUNET_SYSERR;
     89       return;
     90     }
     91     ret = ctx->cb (ctx->cb_cls,
     92                    &amount,
     93                    date);
     94     GNUNET_PQ_cleanup_result (rs);
     95     switch (ret)
     96     {
     97     case GNUNET_OK:
     98       continue;
     99     case GNUNET_NO:
    100       break;
    101     case GNUNET_SYSERR:
    102       ctx->status = GNUNET_SYSERR;
    103       break;
    104     }
    105     break;
    106   }
    107 }
    108 
    109 
    110 enum GNUNET_DB_QueryStatus
    111 TALER_EXCHANGEDB_select_aggregation_amounts_for_kyc_check (
    112   struct TALER_EXCHANGEDB_PostgresContext *pg,
    113   const struct TALER_NormalizedPaytoHashP *h_payto,
    114   struct GNUNET_TIME_Absolute time_limit,
    115   TALER_KYCLOGIC_KycAmountCallback kac,
    116   void *kac_cls)
    117 {
    118   struct GNUNET_PQ_QueryParam params[] = {
    119     GNUNET_PQ_query_param_auto_from_type (h_payto),
    120     GNUNET_PQ_query_param_absolute_time (&time_limit),
    121     GNUNET_PQ_query_param_end
    122   };
    123   struct KycAmountCheckContext ctx = {
    124     .cb = kac,
    125     .cb_cls = kac_cls,
    126     .pg = pg,
    127     .status = GNUNET_OK
    128   };
    129   enum GNUNET_DB_QueryStatus qs;
    130 
    131   PREPARE (pg,
    132            "select_kyc_relevant_aggregation_events",
    133            "SELECT"
    134            " amount"
    135            ",execution_date AS date"
    136            " FROM wire_out"
    137            " WHERE wire_target_h_payto IN"
    138            "   (SELECT wire_target_h_payto"
    139            "      FROM wire_targets"
    140            "     WHERE h_normalized_payto=$1"
    141            "   )"
    142            "  AND execution_date >= $2"
    143            " ORDER BY execution_date DESC");
    144 
    145   qs = GNUNET_PQ_eval_prepared_multi_select (
    146     pg->conn,
    147     "select_kyc_relevant_aggregation_events",
    148     params,
    149     &get_kyc_amounts_cb,
    150     &ctx);
    151   if (GNUNET_OK != ctx.status)
    152     return GNUNET_DB_STATUS_HARD_ERROR;
    153   return qs;
    154 }