exchange

Base system with REST service to issue digital coins, run by the payment service provider
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pg_get_reserve_balance.c (2494B)

      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_reserve_balance.c
     18  * @brief Implementation of the get_reserve_balance 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_reserve_balance.h"
     26 #include "pg_helper.h"
     27 
     28 
     29 enum GNUNET_DB_QueryStatus
     30 TEH_PG_get_reserve_balance (
     31   void *cls,
     32   const struct TALER_ReservePublicKeyP *reserve_pub,
     33   struct TALER_Amount *balance,
     34   struct TALER_FullPayto *origin_account)
     35 {
     36   struct PostgresClosure *pg = cls;
     37   struct GNUNET_PQ_QueryParam params[] = {
     38     GNUNET_PQ_query_param_auto_from_type (reserve_pub),
     39     GNUNET_PQ_query_param_end
     40   };
     41   struct GNUNET_PQ_ResultSpec rs[] = {
     42     TALER_PQ_result_spec_amount ("current_balance",
     43                                  pg->currency,
     44                                  balance),
     45     GNUNET_PQ_result_spec_allow_null (
     46       GNUNET_PQ_result_spec_string ("payto_uri",
     47                                     &origin_account->full_payto),
     48       NULL),
     49     GNUNET_PQ_result_spec_end
     50   };
     51 
     52   origin_account->full_payto = NULL;
     53   PREPARE (pg,
     54            "get_reserve_balance",
     55            "SELECT"
     56            "  r.current_balance"
     57            " ,wt.payto_uri"
     58            " FROM reserves r"
     59            " LEFT JOIN reserves_in ri"
     60            "   USING (reserve_pub)"
     61            " LEFT JOIN wire_targets wt"
     62            "   ON (wt.wire_target_h_payto = ri.wire_source_h_payto)"
     63            " WHERE r.reserve_pub=$1"
     64            " LIMIT 1;");
     65   return GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
     66                                                    "get_reserve_balance",
     67                                                    params,
     68                                                    rs);
     69 }