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/pg_lookup_wire_fee_by_time.c
      18             :  * @brief Implementation of the lookup_wire_fee_by_time 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_lookup_wire_fee_by_time.h"
      26             : #include "pg_helper.h"
      27             : 
      28             : 
      29             : /**
      30             :  * Closure for #wire_fee_by_time_helper()
      31             :  */
      32             : struct WireFeeLookupContext
      33             : {
      34             : 
      35             :   /**
      36             :    * Set to the wire fees. Set to invalid if fees conflict over
      37             :    * the given time period.
      38             :    */
      39             :   struct TALER_WireFeeSet *fees;
      40             : 
      41             :   /**
      42             :    * Plugin context.
      43             :    */
      44             :   struct PostgresClosure *pg;
      45             : };
      46             : 
      47             : 
      48             : /**
      49             :  * Helper function for #TEH_PG_lookup_wire_fee_by_time().
      50             :  * Calls the callback with the wire fee structure.
      51             :  *
      52             :  * @param cls a `struct WireFeeLookupContext`
      53             :  * @param result db results
      54             :  * @param num_results number of results in @a result
      55             :  */
      56             : static void
      57          27 : wire_fee_by_time_helper (void *cls,
      58             :                          PGresult *result,
      59             :                          unsigned int num_results)
      60             : {
      61          27 :   struct WireFeeLookupContext *wlc = cls;
      62          27 :   struct PostgresClosure *pg = wlc->pg;
      63             : 
      64          31 :   for (unsigned int i = 0; i<num_results; i++)
      65             :   {
      66             :     struct TALER_WireFeeSet fs;
      67           4 :     struct GNUNET_PQ_ResultSpec rs[] = {
      68           4 :       TALER_PQ_RESULT_SPEC_AMOUNT ("wire_fee",
      69             :                                    &fs.wire),
      70           4 :       TALER_PQ_RESULT_SPEC_AMOUNT ("closing_fee",
      71             :                                    &fs.closing),
      72             :       GNUNET_PQ_result_spec_end
      73             :     };
      74             : 
      75           4 :     if (GNUNET_OK !=
      76           4 :         GNUNET_PQ_extract_result (result,
      77             :                                   rs,
      78             :                                   i))
      79             :     {
      80           0 :       GNUNET_break (0);
      81             :       /* invalidate */
      82           0 :       memset (wlc->fees,
      83             :               0,
      84             :               sizeof (struct TALER_WireFeeSet));
      85           0 :       return;
      86             :     }
      87           4 :     if (0 == i)
      88             :     {
      89           4 :       *wlc->fees = fs;
      90           4 :       continue;
      91             :     }
      92           0 :     if (0 !=
      93           0 :         TALER_wire_fee_set_cmp (&fs,
      94           0 :                                 wlc->fees))
      95             :     {
      96             :       /* invalidate */
      97           0 :       memset (wlc->fees,
      98             :               0,
      99             :               sizeof (struct TALER_WireFeeSet));
     100           0 :       return;
     101             :     }
     102             :   }
     103             : }
     104             : 
     105             : 
     106             : /**
     107             :  * Lookup information about known wire fees.  Finds all applicable
     108             :  * fees in the given range. If they are identical, returns the
     109             :  * respective @a fees. If any of the fees
     110             :  * differ between @a start_time and @a end_time, the transaction
     111             :  * succeeds BUT returns an invalid amount for both fees.
     112             :  *
     113             :  * @param cls closure
     114             :  * @param wire_method the wire method to lookup fees for
     115             :  * @param start_time starting time of fee
     116             :  * @param end_time end time of fee
     117             :  * @param[out] fees wire fees for that time period; if
     118             :  *             different fees exists within this time
     119             :  *             period, an 'invalid' amount is returned.
     120             :  * @return transaction status code
     121             :  */
     122             : enum GNUNET_DB_QueryStatus
     123          27 : TEH_PG_lookup_wire_fee_by_time (
     124             :   void *cls,
     125             :   const char *wire_method,
     126             :   struct GNUNET_TIME_Timestamp start_time,
     127             :   struct GNUNET_TIME_Timestamp end_time,
     128             :   struct TALER_WireFeeSet *fees)
     129             : {
     130          27 :   struct PostgresClosure *pg = cls;
     131          27 :   struct GNUNET_PQ_QueryParam params[] = {
     132          27 :     GNUNET_PQ_query_param_string (wire_method),
     133          27 :     GNUNET_PQ_query_param_timestamp (&start_time),
     134          27 :     GNUNET_PQ_query_param_timestamp (&end_time),
     135             :     GNUNET_PQ_query_param_end
     136             :   };
     137          27 :   struct WireFeeLookupContext wlc = {
     138             :     .fees = fees,
     139             :     .pg = pg
     140             :   };
     141             : 
     142          27 :   PREPARE (pg,
     143             :            "lookup_wire_fee_by_time",
     144             :            "SELECT"
     145             :            " wire_fee"
     146             :            ",closing_fee"
     147             :            " FROM wire_fee"
     148             :            " WHERE wire_method=$1"
     149             :            " AND end_date > $2"
     150             :            " AND start_date < $3;");
     151          27 :   return GNUNET_PQ_eval_prepared_multi_select (pg->conn,
     152             :                                                "lookup_wire_fee_by_time",
     153             :                                                params,
     154             :                                                &wire_fee_by_time_helper,
     155             :                                                &wlc);
     156             : }