exchange

Base system with REST service to issue digital coins, run by the payment service provider
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select_historic_reserve_revenue.c (4680B)

      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 select_historic_reserve_revenue.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 "auditor-database/select_historic_reserve_revenue.h"
     23 #include "pg_helper.h"
     24 
     25 
     26 /**
     27  * Closure for #historic_reserve_revenue_cb().
     28  */
     29 struct HistoricReserveRevenueContext
     30 {
     31   /**
     32    * Function to call for each result.
     33    */
     34   TALER_AUDITORDB_HistoricReserveRevenueDataCallback cb;
     35 
     36   /**
     37    * Closure for @e cb.
     38    */
     39   void *cb_cls;
     40 
     41   /**
     42    * Plugin context.
     43    */
     44   struct TALER_AUDITORDB_PostgresContext *pg;
     45 
     46   /**
     47    * Number of results processed.
     48    */
     49   enum GNUNET_DB_QueryStatus qs;
     50 };
     51 
     52 
     53 /**
     54  * Helper function for #TALER_AUDITORDB_select_historic_reserve_revenue().
     55  * To be called with the results of a SELECT statement
     56  * that has returned @a num_results results.
     57  *
     58  * @param cls closure of type `struct HistoricRevenueContext *`
     59  * @param result the postgres result
     60  * @param num_results the number of results in @a result
     61  */
     62 static void
     63 historic_reserve_revenue_cb (void *cls,
     64                              PGresult *result,
     65                              unsigned int num_results)
     66 {
     67   struct HistoricReserveRevenueContext *hrc = cls;
     68   struct TALER_AUDITORDB_PostgresContext *pg = hrc->pg;
     69 
     70   for (unsigned int i = 0; i < num_results; i++)
     71   {
     72     uint64_t rowid;
     73     struct GNUNET_TIME_Timestamp start_date;
     74     struct GNUNET_TIME_Timestamp end_date;
     75     struct TALER_Amount reserve_profits;
     76     struct GNUNET_PQ_ResultSpec rs[] = {
     77       GNUNET_PQ_result_spec_uint64 ("row_id",
     78                                     &rowid),
     79       GNUNET_PQ_result_spec_timestamp ("start_date",
     80                                        &start_date),
     81       GNUNET_PQ_result_spec_timestamp ("end_date",
     82                                        &end_date),
     83       TALER_PQ_RESULT_SPEC_AMOUNT ("reserve_profits",
     84                                    &reserve_profits),
     85       GNUNET_PQ_result_spec_end
     86     };
     87 
     88     if (GNUNET_OK !=
     89         GNUNET_PQ_extract_result (result,
     90                                   rs,
     91                                   i))
     92     {
     93       GNUNET_break (0);
     94       hrc->qs = GNUNET_DB_STATUS_HARD_ERROR;
     95       return;
     96     }
     97     hrc->qs = i + 1;
     98     if (GNUNET_OK !=
     99         hrc->cb (hrc->cb_cls,
    100                  rowid,
    101                  start_date,
    102                  end_date,
    103                  &reserve_profits))
    104       break;
    105   }
    106 }
    107 
    108 
    109 enum GNUNET_DB_QueryStatus
    110 TALER_AUDITORDB_select_historic_reserve_revenue (
    111   struct TALER_AUDITORDB_PostgresContext *pg,
    112   int64_t limit,
    113   uint64_t offset,
    114   TALER_AUDITORDB_HistoricReserveRevenueDataCallback cb,
    115   void *cb_cls)
    116 {
    117   uint64_t ulimit = (limit > 0) ? limit : -limit;
    118   struct GNUNET_PQ_QueryParam params[] = {
    119     GNUNET_PQ_query_param_uint64 (&offset),
    120     GNUNET_PQ_query_param_uint64 (&ulimit),
    121     GNUNET_PQ_query_param_end
    122   };
    123   enum GNUNET_DB_QueryStatus qs;
    124   struct HistoricReserveRevenueContext hrc = {
    125     .cb = cb,
    126     .cb_cls = cb_cls,
    127     .pg = pg
    128   };
    129 
    130   PREPARE (pg,
    131            "auditor_historic_reserve_summary_select_inc",
    132            "SELECT"
    133            " row_id"
    134            ",start_date"
    135            ",end_date"
    136            ",reserve_profits"
    137            " FROM auditor_historic_reserve_summary"
    138            " WHERE row_id > $1"
    139            " ORDER BY row_id ASC"
    140            " LIMIT $2");
    141   PREPARE (pg,
    142            "auditor_historic_reserve_summary_select_dec",
    143            "SELECT"
    144            " row_id"
    145            ",start_date"
    146            ",end_date"
    147            ",reserve_profits"
    148            " FROM auditor_historic_reserve_summary"
    149            " WHERE row_id < $1"
    150            " ORDER BY row_id DESC"
    151            " LIMIT $2");
    152   qs = GNUNET_PQ_eval_prepared_multi_select (
    153     pg->conn,
    154     limit > 0
    155     ? "auditor_historic_reserve_summary_select_inc"
    156     : "auditor_historic_reserve_summary_select_dec",
    157     params,
    158     &historic_reserve_revenue_cb,
    159     &hrc);
    160   if (0 >= qs)
    161     return qs;
    162   return hrc.qs;
    163 }