exchange

Base system with REST service to issue digital coins, run by the payment service provider
Log | Files | Refs | Submodules | README | LICENSE

get_reserve_close_info.c (2542B)

      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 get_reserve_close_info.c
     18  * @brief Low-level (statement-level) Postgres database access for the exchange
     19  * @author Christian Grothoff
     20  */
     21 #include "taler/taler_pq_lib.h"
     22 #include "exchange-database/get_reserve_close_info.h"
     23 #include "helper.h"
     24 
     25 
     26 enum GNUNET_DB_QueryStatus
     27 TALER_EXCHANGEDB_get_reserve_close_info (
     28   struct TALER_EXCHANGEDB_PostgresContext *pg,
     29   const struct TALER_ReservePublicKeyP *reserve_pub,
     30   struct TALER_Amount *balance,
     31   struct TALER_FullPayto *payto_uri)
     32 {
     33   struct GNUNET_PQ_QueryParam params[] = {
     34     GNUNET_PQ_query_param_auto_from_type (reserve_pub),
     35     GNUNET_PQ_query_param_end
     36   };
     37   struct GNUNET_PQ_ResultSpec rs[] = {
     38     TALER_PQ_result_spec_amount ("current_balance",
     39                                  pg->currency,
     40                                  balance),
     41     GNUNET_PQ_result_spec_allow_null (
     42       GNUNET_PQ_result_spec_string ("payto_uri",
     43                                     &payto_uri->full_payto),
     44       NULL),
     45     GNUNET_PQ_result_spec_end
     46   };
     47 
     48   /* A reserve that was funded peer-to-peer (purse merge or wad) has no
     49      'reserves_in' row, so the LEFT JOIN yields a NULL payto_uri.  The caller
     50      checks for that and has a 409 ready; reading it without allow_null made
     51      the extraction fail and turned that case into an HTTP 500. */
     52   payto_uri->full_payto = NULL;
     53   PREPARE (pg,
     54            "get_reserve_close_info",
     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 (ri.wire_source_h_payto = wt.wire_target_h_payto)"
     63            " WHERE r.reserve_pub=$1;");
     64   return GNUNET_PQ_eval_prepared_singleton_select (
     65     pg->conn,
     66     "get_reserve_close_info",
     67     params,
     68     rs);
     69 }