merchant

Merchant backend to process payments, run by merchants
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insert_exchange_wire_fee.c (4942B)

      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 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   struct GNUNET_PQ_QueryParam params[] = {
     38     GNUNET_PQ_query_param_auto_from_type (master_pub),
     39     GNUNET_PQ_query_param_auto_from_type (h_wire_method),
     40     TALER_PQ_query_param_amount_with_currency (pg->conn,
     41                                                &fees->wire),
     42     TALER_PQ_query_param_amount_with_currency (pg->conn,
     43                                                &fees->closing),
     44     GNUNET_PQ_query_param_timestamp (&start_date),
     45     GNUNET_PQ_query_param_timestamp (&end_date),
     46     GNUNET_PQ_query_param_auto_from_type (master_sig),
     47     GNUNET_PQ_query_param_end
     48   };
     49   bool inserted;
     50   bool identical;
     51   struct GNUNET_PQ_ResultSpec rs[] = {
     52     GNUNET_PQ_result_spec_bool ("inserted",
     53                                 &inserted),
     54     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   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   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   qs = GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
    100                                                  "insert_exchange_wire_fee",
    101                                                  params,
    102                                                  rs);
    103   if (qs < 0)
    104     return qs;
    105   GNUNET_break (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs);
    106   if (inserted)
    107     return GNUNET_DB_STATUS_SUCCESS_ONE_RESULT;
    108   if (identical)
    109     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   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   GNUNET_break (0);
    117   return GNUNET_DB_STATUS_HARD_ERROR;
    118 }