exchange

Base system with REST service to issue digital coins, run by the payment service provider
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pg_select_deposit_amounts_for_kyc_check.c (4288B)

      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 /**
     17  * @file exchangedb/pg_select_deposit_amounts_for_kyc_check.c
     18  * @brief Implementation of the select_deposit_amounts_for_kyc_check 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_deposit_amounts_for_kyc_check.h"
     26 #include "pg_helper.h"
     27 
     28 /**
     29  * Closure for #get_kyc_amounts_cb().
     30  */
     31 struct KycAmountCheckContext
     32 {
     33   /**
     34    * Function to call per result.
     35    */
     36   TALER_EXCHANGEDB_KycAmountCallback cb;
     37 
     38   /**
     39    * Closure for @e cb.
     40    */
     41   void *cb_cls;
     42 
     43   /**
     44    * Plugin context.
     45    */
     46   struct PostgresClosure *pg;
     47 
     48   /**
     49    * Flag set to #GNUNET_OK as long as everything is fine.
     50    */
     51   enum GNUNET_GenericReturnValue status;
     52 
     53 };
     54 
     55 /**
     56  * Invoke the callback for each result.
     57  *
     58  * @param cls a `struct KycAmountCheckContext *`
     59  * @param result SQL result
     60  * @param num_results number of rows in @a result
     61  */
     62 static void
     63 get_kyc_amounts_cb (void *cls,
     64                     PGresult *result,
     65                     unsigned int num_results)
     66 {
     67   struct KycAmountCheckContext *ctx = cls;
     68   struct PostgresClosure *pg = ctx->pg;
     69 
     70   for (unsigned int i = 0; i < num_results; i++)
     71   {
     72     struct GNUNET_TIME_Absolute date;
     73     struct TALER_Amount amount;
     74     struct GNUNET_PQ_ResultSpec rs[] = {
     75       TALER_PQ_RESULT_SPEC_AMOUNT ("amount",
     76                                    &amount),
     77       GNUNET_PQ_result_spec_absolute_time ("date",
     78                                            &date),
     79       GNUNET_PQ_result_spec_end
     80     };
     81     enum GNUNET_GenericReturnValue ret;
     82 
     83     if (GNUNET_OK !=
     84         GNUNET_PQ_extract_result (result,
     85                                   rs,
     86                                   i))
     87     {
     88       GNUNET_break (0);
     89       ctx->status = GNUNET_SYSERR;
     90       return;
     91     }
     92     ret = ctx->cb (ctx->cb_cls,
     93                    &amount,
     94                    date);
     95     GNUNET_PQ_cleanup_result (rs);
     96     switch (ret)
     97     {
     98     case GNUNET_OK:
     99       continue;
    100     case GNUNET_NO:
    101       break;
    102     case GNUNET_SYSERR:
    103       ctx->status = GNUNET_SYSERR;
    104       break;
    105     }
    106     break;
    107   }
    108 }
    109 
    110 
    111 enum GNUNET_DB_QueryStatus
    112 TEH_PG_select_deposit_amounts_for_kyc_check (
    113   void *cls,
    114   const struct TALER_NormalizedPaytoHashP *h_payto,
    115   struct GNUNET_TIME_Absolute time_limit,
    116   TALER_EXCHANGEDB_KycAmountCallback kac,
    117   void *kac_cls)
    118 {
    119   struct PostgresClosure *pg = cls;
    120   struct GNUNET_PQ_QueryParam params[] = {
    121     GNUNET_PQ_query_param_auto_from_type (h_payto),
    122     GNUNET_PQ_query_param_absolute_time (&time_limit),
    123     GNUNET_PQ_query_param_end
    124   };
    125   struct KycAmountCheckContext ctx = {
    126     .cb = kac,
    127     .cb_cls = kac_cls,
    128     .pg = pg,
    129     .status = GNUNET_OK
    130   };
    131   enum GNUNET_DB_QueryStatus qs;
    132 
    133   PREPARE (pg,
    134            "select_kyc_relevant_deposit_events",
    135            "SELECT"
    136            " cd.amount_with_fee AS amount"
    137            ",bd.exchange_timestamp AS date"
    138            " FROM batch_deposits bd"
    139            " JOIN coin_deposits cd"
    140            "   USING (batch_deposit_serial_id)"
    141            " WHERE wire_target_h_payto IN ("
    142            "   SELECT wire_target_h_payto"
    143            "     FROM wire_targets"
    144            "    WHERE h_normalized_payto=$1"
    145            "   )"
    146            "   AND bd.exchange_timestamp >= $2"
    147            " ORDER BY bd.exchange_timestamp DESC");
    148   qs = GNUNET_PQ_eval_prepared_multi_select (
    149     pg->conn,
    150     "select_kyc_relevant_deposit_events",
    151     params,
    152     &get_kyc_amounts_cb,
    153     &ctx);
    154   if (GNUNET_OK != ctx.status)
    155     return GNUNET_DB_STATUS_HARD_ERROR;
    156   return qs;
    157 }