Line data    Source code

       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/get_wire_fee_by_time.c
      18              :  * @brief Implementation of the get_wire_fee_by_time function for Postgres
      19              :  * @author Christian Grothoff
      20              :  */
      21              : #include "taler/taler_pq_lib.h"
      22              : #include "exchange-database/get_wire_fee_by_time.h"
      23              : #include "helper.h"
      24              : 
      25              : 
      26              : /**
      27              :  * Closure for #wire_fee_by_time_helper()
      28              :  */
      29              : struct WireFeeLookupContext
      30              : {
      31              : 
      32              :   /**
      33              :    * Set to the wire fees. Set to invalid if fees conflict over
      34              :    * the given time period.
      35              :    */
      36              :   struct TALER_WireFeeSet *fees;
      37              : 
      38              :   /**
      39              :    * Plugin context.
      40              :    */
      41              :   struct TALER_EXCHANGEDB_PostgresContext *pg;
      42              : };
      43              : 
      44              : 
      45              : /**
      46              :  * Helper function for #TALER_EXCHANGEDB_get_wire_fee_by_time().
      47              :  * Calls the callback with the wire fee structure.
      48              :  *
      49              :  * @param cls a `struct WireFeeLookupContext`
      50              :  * @param result db results
      51              :  * @param num_results number of results in @a result
      52              :  */
      53              : static void
      54           47 : wire_fee_by_time_helper (void *cls,
      55              :                          PGresult *result,
      56              :                          unsigned int num_results)
      57              : {
      58           47 :   struct WireFeeLookupContext *wlc = cls;
      59           47 :   struct TALER_EXCHANGEDB_PostgresContext *pg = wlc->pg;
      60              : 
      61           56 :   for (unsigned int i = 0; i<num_results; i++)
      62              :   {
      63              :     struct TALER_WireFeeSet fs;
      64           10 :     struct GNUNET_PQ_ResultSpec rs[] = {
      65           10 :       TALER_PQ_RESULT_SPEC_AMOUNT ("wire_fee",
      66              :                                    &fs.wire),
      67           10 :       TALER_PQ_RESULT_SPEC_AMOUNT ("closing_fee",
      68              :                                    &fs.closing),
      69              :       GNUNET_PQ_result_spec_end
      70              :     };
      71              : 
      72           10 :     if (GNUNET_OK !=
      73           10 :         GNUNET_PQ_extract_result (result,
      74              :                                   rs,
      75              :                                   i))
      76              :     {
      77            0 :       GNUNET_break (0);
      78              :       /* invalidate */
      79            0 :       memset (wlc->fees,
      80              :               0,
      81              :               sizeof (struct TALER_WireFeeSet));
      82            1 :       return;
      83              :     }
      84           10 :     if (0 == i)
      85              :     {
      86            7 :       *wlc->fees = fs;
      87            7 :       continue;
      88              :     }
      89            3 :     if (0 !=
      90            3 :         TALER_wire_fee_set_cmp (&fs,
      91            3 :                                 wlc->fees))
      92              :     {
      93              :       /* invalidate */
      94            1 :       memset (wlc->fees,
      95              :               0,
      96              :               sizeof (struct TALER_WireFeeSet));
      97            1 :       return;
      98              :     }
      99              :   }
     100              : }
     101              : 
     102              : 
     103              : enum GNUNET_DB_QueryStatus
     104           47 : TALER_EXCHANGEDB_get_wire_fee_by_time (
     105              :   struct TALER_EXCHANGEDB_PostgresContext *pg,
     106              :   const char *wire_method,
     107              :   struct GNUNET_TIME_Timestamp start_time,
     108              :   struct GNUNET_TIME_Timestamp end_time,
     109              :   struct TALER_WireFeeSet *fees)
     110              : {
     111           47 :   struct GNUNET_PQ_QueryParam params[] = {
     112           47 :     GNUNET_PQ_query_param_string (wire_method),
     113           47 :     GNUNET_PQ_query_param_timestamp (&start_time),
     114           47 :     GNUNET_PQ_query_param_timestamp (&end_time),
     115              :     GNUNET_PQ_query_param_end
     116              :   };
     117           47 :   struct WireFeeLookupContext wlc = {
     118              :     .fees = fees,
     119              :     .pg = pg
     120              :   };
     121              : 
     122           47 :   PREPARE (pg,
     123              :            "get_wire_fee_by_time",
     124              :            "SELECT"
     125              :            " wire_fee"
     126              :            ",closing_fee"
     127              :            " FROM wire_fee"
     128              :            " WHERE wire_method=$1"
     129              :            " AND end_date > $2"
     130              :            " AND start_date < $3;");
     131           47 :   return GNUNET_PQ_eval_prepared_multi_select (pg->conn,
     132              :                                                "get_wire_fee_by_time",
     133              :                                                params,
     134              :                                                &wire_fee_by_time_helper,
     135              :                                                &wlc);
     136              : }