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Base system with REST service to issue digital coins, run by the payment service provider
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select_aggregations_above_serial.c (4155B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2023, 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_aggregations_above_serial.c
     18  * @brief Implementation of the select_aggregations_above_serial function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include "taler/taler_pq_lib.h"
     22 #include "exchange-database/select_aggregations_above_serial.h"
     23 #include "helper.h"
     24 
     25 /**
     26  * Closure for #aggregation_serial_helper_cb().
     27  */
     28 struct AggregationSerialContext
     29 {
     30 
     31   /**
     32    * Callback to call.
     33    */
     34   TALER_EXCHANGEDB_AggregationCallback 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    * Status code, set to #GNUNET_SYSERR on hard errors.
     48    */
     49   enum GNUNET_GenericReturnValue status;
     50 };
     51 
     52 
     53 /**
     54  * Helper function to be called with the results of a SELECT statement
     55  * that has returned @a num_results results.
     56  *
     57  * @param cls closure of type `struct AggregationSerialContext`
     58  * @param result the postgres result
     59  * @param num_results the number of results in @a result
     60  */
     61 static void
     62 aggregation_serial_helper_cb (void *cls,
     63                               PGresult *result,
     64                               unsigned int num_results)
     65 {
     66   struct AggregationSerialContext *dsc = cls;
     67   struct TALER_EXCHANGEDB_PostgresContext *pg = dsc->pg;
     68 
     69   for (unsigned int i = 0; i<num_results; i++)
     70   {
     71     uint64_t tracking_rowid;
     72     uint64_t batch_deposit_serial_id;
     73     struct TALER_Amount amount;
     74     struct GNUNET_PQ_ResultSpec rs[] = {
     75       TALER_PQ_RESULT_SPEC_AMOUNT ("total_amount",
     76                                    &amount),
     77       GNUNET_PQ_result_spec_uint64 ("aggregation_serial_id",
     78                                     &tracking_rowid),
     79       GNUNET_PQ_result_spec_uint64 ("batch_deposit_serial_id",
     80                                     &batch_deposit_serial_id),
     81       GNUNET_PQ_result_spec_end
     82     };
     83 
     84     if (GNUNET_OK !=
     85         GNUNET_PQ_extract_result (result,
     86                                   rs,
     87                                   i))
     88     {
     89       GNUNET_break (0);
     90       dsc->status = GNUNET_SYSERR;
     91       return;
     92     }
     93     dsc->cb (dsc->cb_cls,
     94              &amount,
     95              tracking_rowid,
     96              batch_deposit_serial_id);
     97     GNUNET_PQ_cleanup_result (rs);
     98   }
     99 }
    100 
    101 
    102 enum GNUNET_DB_QueryStatus
    103 TALER_EXCHANGEDB_select_aggregations_above_serial (
    104   struct TALER_EXCHANGEDB_PostgresContext *pg,
    105   uint64_t min_tracking_serial_id,
    106   TALER_EXCHANGEDB_AggregationCallback cb,
    107   void *cb_cls)
    108 {
    109   struct GNUNET_PQ_QueryParam params[] = {
    110     GNUNET_PQ_query_param_uint64 (&min_tracking_serial_id),
    111     GNUNET_PQ_query_param_end
    112   };
    113   struct AggregationSerialContext asc = {
    114     .cb = cb,
    115     .cb_cls = cb_cls,
    116     .pg = pg,
    117     .status = GNUNET_OK
    118   };
    119   enum GNUNET_DB_QueryStatus qs;
    120 
    121   /* Fetch aggregations with rowid '\geq' the given parameter */
    122   PREPARE (pg,
    123            "select_aggregations_above_serial",
    124            "SELECT"
    125            " aggregation_serial_id"
    126            ",batch_deposit_serial_id"
    127            ",total_amount"
    128            " FROM exchange_do_select_aggregations_above_serial($1);");
    129   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    130                                              "select_aggregations_above_serial",
    131                                              params,
    132                                              &aggregation_serial_helper_cb,
    133                                              &asc);
    134   if (GNUNET_OK != asc.status)
    135     return GNUNET_DB_STATUS_HARD_ERROR;
    136   return qs;
    137 }