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Base system with REST service to issue digital coins, run by the payment service provider
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select_aml_statistics.c (3985B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2024, 2025 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_aml_statistics.c
     18  * @brief Implementation of the select_aml_statistics function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include "taler/taler_pq_lib.h"
     22 #include "exchange-database/select_aml_statistics.h"
     23 #include "helper.h"
     24 
     25 
     26 /**
     27  * Closure for #get_statistics_cb().
     28  */
     29 struct GetStatisticsContext
     30 {
     31   /**
     32    * Function to call per result.
     33    */
     34   TALER_EXCHANGEDB_AmlStatisticsCallback 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 GetStatisticsContext *`
     58  * @param result SQL result
     59  * @param num_results number of rows in @a result
     60  */
     61 static void
     62 get_statistics_cb (void *cls,
     63                    PGresult *result,
     64                    unsigned int num_results)
     65 {
     66   struct GetStatisticsContext *ctx = cls;
     67 
     68   for (unsigned int i = 0; i < num_results; i++)
     69   {
     70     uint64_t val;
     71     char *name;
     72     struct GNUNET_PQ_ResultSpec rs[] = {
     73       GNUNET_PQ_result_spec_string ("name",
     74                                     &name),
     75       GNUNET_PQ_result_spec_uint64 ("value",
     76                                     &val),
     77       GNUNET_PQ_result_spec_end
     78     };
     79 
     80     if (GNUNET_OK !=
     81         GNUNET_PQ_extract_result (result,
     82                                   rs,
     83                                   i))
     84     {
     85       GNUNET_break (0);
     86       ctx->status = GNUNET_SYSERR;
     87       return;
     88     }
     89     ctx->cb (ctx->cb_cls,
     90              name,
     91              val);
     92     GNUNET_PQ_cleanup_result (rs);
     93   }
     94 }
     95 
     96 
     97 enum GNUNET_DB_QueryStatus
     98 TALER_EXCHANGEDB_select_aml_statistics (
     99   struct TALER_EXCHANGEDB_PostgresContext *pg,
    100   size_t num_names,
    101   const char *names[static num_names],
    102   struct GNUNET_TIME_Timestamp start_date,
    103   struct GNUNET_TIME_Timestamp end_date,
    104   TALER_EXCHANGEDB_AmlStatisticsCallback cb,
    105   void *cb_cls)
    106 {
    107   struct GetStatisticsContext ctx = {
    108     .cb = cb,
    109     .cb_cls = cb_cls,
    110     .pg = pg,
    111     .status = GNUNET_OK
    112   };
    113   struct GNUNET_PQ_QueryParam params[] = {
    114     GNUNET_PQ_query_param_array_ptrs_string (num_names,
    115                                              names,
    116                                              pg->conn),
    117     GNUNET_PQ_query_param_timestamp (&start_date),
    118     GNUNET_PQ_query_param_timestamp (&end_date),
    119     GNUNET_PQ_query_param_end
    120   };
    121   enum GNUNET_DB_QueryStatus qs;
    122 
    123   PREPARE (pg,
    124            "select_aml_statistics",
    125            "SELECT "
    126            " event_type AS name"
    127            ",COUNT(*) AS value"
    128            " FROM kyc_events"
    129            " WHERE event_type = ANY ($1)"
    130            "   AND event_timestamp >= $2"
    131            "   AND event_timestamp < $3"
    132            " GROUP BY event_type;");
    133   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    134                                              "select_aml_statistics",
    135                                              params,
    136                                              &get_statistics_cb,
    137                                              &ctx);
    138   GNUNET_PQ_cleanup_query_params_closures (params);
    139   if (GNUNET_OK != ctx.status)
    140     return GNUNET_DB_STATUS_HARD_ERROR;
    141   return qs;
    142 }