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pg_select_merge_amounts_for_kyc_check.c (4213B)

      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/pg_select_merge_amounts_for_kyc_check.c
     18  * @brief Implementation of the select_merge_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_merge_amounts_for_kyc_check.h"
     26 #include "pg_helper.h"
     27 
     28 
     29 /**
     30  * Closure for #get_kyc_amounts_cb().
     31  */
     32 struct KycAmountCheckContext
     33 {
     34   /**
     35    * Function to call per result.
     36    */
     37   TALER_EXCHANGEDB_KycAmountCallback cb;
     38 
     39   /**
     40    * Closure for @e cb.
     41    */
     42   void *cb_cls;
     43 
     44   /**
     45    * Plugin context.
     46    */
     47   struct PostgresClosure *pg;
     48 
     49   /**
     50    * Flag set to #GNUNET_OK as long as everything is fine.
     51    */
     52   enum GNUNET_GenericReturnValue status;
     53 
     54 };
     55 
     56 /**
     57  * Invoke the callback for each result.
     58  *
     59  * @param cls a `struct KycAmountCheckContext *`
     60  * @param result SQL result
     61  * @param num_results number of rows in @a result
     62  */
     63 static void
     64 get_kyc_amounts_cb (void *cls,
     65                     PGresult *result,
     66                     unsigned int num_results)
     67 {
     68   struct KycAmountCheckContext *ctx = cls;
     69   struct PostgresClosure *pg = ctx->pg;
     70 
     71   for (unsigned int i = 0; i < num_results; i++)
     72   {
     73     struct GNUNET_TIME_Absolute date;
     74     struct TALER_Amount amount;
     75     struct GNUNET_PQ_ResultSpec rs[] = {
     76       TALER_PQ_RESULT_SPEC_AMOUNT ("amount",
     77                                    &amount),
     78       GNUNET_PQ_result_spec_absolute_time ("date",
     79                                            &date),
     80       GNUNET_PQ_result_spec_end
     81     };
     82     enum GNUNET_GenericReturnValue ret;
     83 
     84     if (GNUNET_OK !=
     85         GNUNET_PQ_extract_result (result,
     86                                   rs,
     87                                   i))
     88     {
     89       GNUNET_break (0);
     90       ctx->status = GNUNET_SYSERR;
     91       return;
     92     }
     93     ret = ctx->cb (ctx->cb_cls,
     94                    &amount,
     95                    date);
     96     GNUNET_PQ_cleanup_result (rs);
     97     switch (ret)
     98     {
     99     case GNUNET_OK:
    100       continue;
    101     case GNUNET_NO:
    102       break;
    103     case GNUNET_SYSERR:
    104       ctx->status = GNUNET_SYSERR;
    105       break;
    106     }
    107     break;
    108   }
    109 }
    110 
    111 
    112 enum GNUNET_DB_QueryStatus
    113 TEH_PG_select_merge_amounts_for_kyc_check (
    114   void *cls,
    115   const struct TALER_NormalizedPaytoHashP *h_payto,
    116   struct GNUNET_TIME_Absolute time_limit,
    117   TALER_EXCHANGEDB_KycAmountCallback kac,
    118   void *kac_cls)
    119 {
    120   struct PostgresClosure *pg = cls;
    121   struct GNUNET_PQ_QueryParam params[] = {
    122     GNUNET_PQ_query_param_auto_from_type (h_payto),
    123     GNUNET_PQ_query_param_absolute_time (&time_limit),
    124     GNUNET_PQ_query_param_end
    125   };
    126   struct KycAmountCheckContext ctx = {
    127     .cb = kac,
    128     .cb_cls = kac_cls,
    129     .pg = pg,
    130     .status = GNUNET_OK
    131   };
    132   enum GNUNET_DB_QueryStatus qs;
    133 
    134   PREPARE (pg,
    135            "select_kyc_relevant_merge_events",
    136            "SELECT"
    137            " amount_with_fee AS amount"
    138            ",merge_timestamp AS date"
    139            " FROM account_merges"
    140            " JOIN purse_merges USING (purse_pub)"
    141            " JOIN purse_requests USING (purse_pub)"
    142            " JOIN purse_decision USING (purse_pub)"
    143            " WHERE wallet_h_payto=$1"
    144            "   AND merge_timestamp >= $2"
    145            "   AND NOT refunded"
    146            " ORDER BY merge_timestamp DESC");
    147   qs = GNUNET_PQ_eval_prepared_multi_select (
    148     pg->conn,
    149     "select_kyc_relevant_merge_events",
    150     params,
    151     &get_kyc_amounts_cb,
    152     &ctx);
    153   if (GNUNET_OK != ctx.status)
    154     return GNUNET_DB_STATUS_HARD_ERROR;
    155   return qs;
    156 }