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Base system with REST service to issue digital coins, run by the payment service provider
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pg_get_wire_fees.c (4147B)

      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 exchangedb/pg_get_wire_fees.c
     18  * @brief Implementation of the get_wire_fees 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_get_wire_fees.h"
     26 #include "pg_helper.h"
     27 
     28 /**
     29  * Closure for #get_wire_fees_cb().
     30  */
     31 struct GetWireFeesContext
     32 {
     33   /**
     34    * Function to call per result.
     35    */
     36   TALER_EXCHANGEDB_WireFeeCallback 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 /**
     57  * Invoke the callback for each result.
     58  *
     59  * @param cls a `struct GetWireFeesContext *`
     60  * @param result SQL result
     61  * @param num_results number of rows in @a result
     62  */
     63 static void
     64 get_wire_fees_cb (void *cls,
     65                   PGresult *result,
     66                   unsigned int num_results)
     67 {
     68   struct GetWireFeesContext *ctx = cls;
     69   struct PostgresClosure *pg = ctx->pg;
     70 
     71   for (unsigned int i = 0; i < num_results; i++)
     72   {
     73     struct TALER_MasterSignatureP master_sig;
     74     struct TALER_WireFeeSet fees;
     75     struct GNUNET_TIME_Timestamp start_date;
     76     struct GNUNET_TIME_Timestamp end_date;
     77     struct GNUNET_PQ_ResultSpec rs[] = {
     78       TALER_PQ_RESULT_SPEC_AMOUNT ("wire_fee",
     79                                    &fees.wire),
     80       TALER_PQ_RESULT_SPEC_AMOUNT ("closing_fee",
     81                                    &fees.closing),
     82       GNUNET_PQ_result_spec_timestamp ("start_date",
     83                                        &start_date),
     84       GNUNET_PQ_result_spec_timestamp ("end_date",
     85                                        &end_date),
     86       GNUNET_PQ_result_spec_auto_from_type ("master_sig",
     87                                             &master_sig),
     88       GNUNET_PQ_result_spec_end
     89     };
     90 
     91     if (GNUNET_OK !=
     92         GNUNET_PQ_extract_result (result,
     93                                   rs,
     94                                   i))
     95     {
     96       GNUNET_break (0);
     97       ctx->status = GNUNET_SYSERR;
     98       return;
     99     }
    100     ctx->cb (ctx->cb_cls,
    101              &fees,
    102              start_date,
    103              end_date,
    104              &master_sig);
    105     GNUNET_PQ_cleanup_result (rs);
    106   }
    107 }
    108 
    109 
    110 enum GNUNET_DB_QueryStatus
    111 TEH_PG_get_wire_fees (void *cls,
    112                       const char *wire_method,
    113                       TALER_EXCHANGEDB_WireFeeCallback cb,
    114                       void *cb_cls)
    115 {
    116   struct PostgresClosure *pg = cls;
    117   struct GNUNET_PQ_QueryParam params[] = {
    118     GNUNET_PQ_query_param_string (wire_method),
    119     GNUNET_PQ_query_param_end
    120   };
    121   struct GetWireFeesContext ctx = {
    122     .cb = cb,
    123     .cb_cls = cb_cls,
    124     .pg = pg,
    125     .status = GNUNET_OK
    126   };
    127   enum GNUNET_DB_QueryStatus qs;
    128 
    129   PREPARE (pg,
    130            "get_wire_fees",
    131            "SELECT"
    132            " wire_fee"
    133            ",closing_fee"
    134            ",start_date"
    135            ",end_date"
    136            ",master_sig"
    137            " FROM wire_fee"
    138            " WHERE wire_method=$1");
    139   qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
    140                                              "get_wire_fees",
    141                                              params,
    142                                              &get_wire_fees_cb,
    143                                              &ctx);
    144   if (GNUNET_OK != ctx.status)
    145     return GNUNET_DB_STATUS_HARD_ERROR;
    146   return qs;
    147 }