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 src/backenddb/insert_exchange_wire_fee.c
      18              :  * @brief Implementation of the insert_exchange_wire_fee function for Postgres
      19              :  * @author Christian Grothoff
      20              :  */
      21              : #include "platform.h"
      22              : #include <taler/taler_pq_lib.h>
      23              : #include "merchant-database/insert_exchange_wire_fee.h"
      24              : #include "helper.h"
      25              : 
      26              : 
      27              : enum GNUNET_DB_QueryStatus
      28           32 : TALER_MERCHANTDB_insert_exchange_wire_fee (
      29              :   struct TALER_MERCHANTDB_PostgresContext *pg,
      30              :   const struct TALER_MasterPublicKeyP *master_pub,
      31              :   const struct GNUNET_HashCode *h_wire_method,
      32              :   const struct TALER_WireFeeSet *fees,
      33              :   struct GNUNET_TIME_Timestamp start_date,
      34              :   struct GNUNET_TIME_Timestamp end_date,
      35              :   const struct TALER_MasterSignatureP *master_sig)
      36              : {
      37           32 :   struct GNUNET_PQ_QueryParam params[] = {
      38           32 :     GNUNET_PQ_query_param_auto_from_type (master_pub),
      39           32 :     GNUNET_PQ_query_param_auto_from_type (h_wire_method),
      40           32 :     TALER_PQ_query_param_amount_with_currency (pg->conn,
      41              :                                                &fees->wire),
      42           32 :     TALER_PQ_query_param_amount_with_currency (pg->conn,
      43              :                                                &fees->closing),
      44           32 :     GNUNET_PQ_query_param_timestamp (&start_date),
      45           32 :     GNUNET_PQ_query_param_timestamp (&end_date),
      46           32 :     GNUNET_PQ_query_param_auto_from_type (master_sig),
      47              :     GNUNET_PQ_query_param_end
      48              :   };
      49              :   bool inserted;
      50              :   bool identical;
      51           32 :   struct GNUNET_PQ_ResultSpec rs[] = {
      52           32 :     GNUNET_PQ_result_spec_bool ("inserted",
      53              :                                 &inserted),
      54           32 :     GNUNET_PQ_result_spec_bool ("identical",
      55              :                                 &identical),
      56              :     GNUNET_PQ_result_spec_end
      57              :   };
      58              :   enum GNUNET_DB_QueryStatus qs;
      59              : 
      60              :   /* no preflight check here, run in its own transaction by the caller */
      61              :   /* Note: a bare 'ON CONFLICT DO NOTHING' would silently discard a
      62              :      *changed* fee for an existing (master_pub, h_wire_method,
      63              :      start_date), leaving us computing with the stale one.  The CTE
      64              :      therefore also reports whether the row that is already there is the
      65              :      one we were asked to store; if it is not, the exchange contradicted
      66              :      a fee it signed earlier and the caller must not proceed. */
      67           32 :   PREPARE (pg,
      68              :            "insert_exchange_wire_fee",
      69              :            "WITH ins AS ("
      70              :            " INSERT INTO merchant.merchant_exchange_wire_fees"
      71              :            " (master_pub"
      72              :            " ,h_wire_method"
      73              :            " ,wire_fee"
      74              :            " ,closing_fee"
      75              :            " ,start_date"
      76              :            " ,end_date"
      77              :            " ,master_sig)"
      78              :            " VALUES "
      79              :            " ($1, $2, $3, $4, $5, $6, $7)"
      80              :            " ON CONFLICT (master_pub,h_wire_method,start_date)"
      81              :            "   DO NOTHING"
      82              :            " RETURNING 1)"
      83              :            "SELECT"
      84              :            " EXISTS (SELECT 1 FROM ins) AS inserted"
      85              :            ",EXISTS (SELECT 1"
      86              :            "           FROM merchant.merchant_exchange_wire_fees"
      87              :            "          WHERE master_pub=$1"
      88              :            "            AND h_wire_method=$2"
      89              :            "            AND start_date=$5"
      90              :            "            AND end_date=$6"
      91              :            "            AND wire_fee=$3"
      92              :            "            AND closing_fee=$4"
      93              :            "            AND master_sig=$7) AS identical");
      94           32 :   GNUNET_log (GNUNET_ERROR_TYPE_INFO,
      95              :               "Storing wire fee for %s starting at %s of %s\n",
      96              :               TALER_B2S (master_pub),
      97              :               GNUNET_TIME_timestamp2s (start_date),
      98              :               TALER_amount2s (&fees->wire));
      99           32 :   qs = GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
     100              :                                                  "insert_exchange_wire_fee",
     101              :                                                  params,
     102              :                                                  rs);
     103           32 :   if (qs < 0)
     104            0 :     return qs;
     105           32 :   GNUNET_break (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs);
     106           32 :   if (inserted)
     107           30 :     return GNUNET_DB_STATUS_SUCCESS_ONE_RESULT;
     108            2 :   if (identical)
     109            1 :     return GNUNET_DB_STATUS_SUCCESS_NO_RESULTS;
     110              :   /* FIXME: should properly distinguish this error from
     111              :      actual database failures; change signature of function eventually! */
     112            1 :   GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
     113              :               "Exchange %s signed a different wire fee for the same wire method and start date %s; keeping the fee we already have on file\n",
     114              :               TALER_B2S (master_pub),
     115              :               GNUNET_TIME_timestamp2s (start_date));
     116            1 :   GNUNET_break (0);
     117            1 :   return GNUNET_DB_STATUS_HARD_ERROR;
     118              : }