lookup_units.c (5383B)
1 /* 2 This file is part of TALER 3 Copyright (C) 2025 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/lookup_units.c 18 * @brief Implementation of the lookup_units function for Postgres 19 * @author Bohdan Potuzhnyi 20 */ 21 #include "platform.h" 22 #include <taler/taler_error_codes.h> 23 #include <taler/taler_dbevents.h> 24 #include <taler/taler_pq_lib.h> 25 #include "merchant-database/lookup_units.h" 26 #include "helper.h" 27 28 29 /** 30 * Context used for TALER_MERCHANTDB_lookup_units(). 31 */ 32 struct LookupUnitsContext 33 { 34 TALER_MERCHANTDB_UnitsCallback cb; 35 void *cb_cls; 36 bool extract_failed; 37 }; 38 39 40 static void 41 lookup_units_cb (void *cls, 42 PGresult *result, 43 unsigned int num_results) 44 { 45 struct LookupUnitsContext *luc = cls; 46 47 for (unsigned int i = 0; i<num_results; i++) 48 { 49 struct TALER_MERCHANTDB_UnitDetails ud = { 0 }; 50 struct GNUNET_PQ_ResultSpec rs[] = { 51 GNUNET_PQ_result_spec_uint64 ("unit_serial", 52 &ud.unit_serial), 53 GNUNET_PQ_result_spec_string ("unit", 54 &ud.unit), 55 GNUNET_PQ_result_spec_string ("unit_name_long", 56 &ud.unit_name_long), 57 GNUNET_PQ_result_spec_string ("unit_name_short", 58 &ud.unit_name_short), 59 TALER_PQ_result_spec_json ("unit_name_long_i18n", 60 &ud.unit_name_long_i18n), 61 TALER_PQ_result_spec_json ("unit_name_short_i18n", 62 &ud.unit_name_short_i18n), 63 GNUNET_PQ_result_spec_bool ("unit_allow_fraction", 64 &ud.unit_allow_fraction), 65 GNUNET_PQ_result_spec_uint32 ("unit_precision_level", 66 &ud.unit_precision_level), 67 GNUNET_PQ_result_spec_bool ("unit_active", 68 &ud.unit_active), 69 GNUNET_PQ_result_spec_bool ("unit_builtin", 70 &ud.unit_builtin), 71 GNUNET_PQ_result_spec_end 72 }; 73 74 if (GNUNET_OK != 75 GNUNET_PQ_extract_result (result, 76 rs, 77 i)) 78 { 79 GNUNET_break (0); 80 luc->extract_failed = true; 81 return; 82 } 83 luc->cb (luc->cb_cls, 84 ud.unit_serial, 85 &ud); 86 GNUNET_PQ_cleanup_result (rs); 87 } 88 } 89 90 91 enum GNUNET_DB_QueryStatus 92 TALER_MERCHANTDB_lookup_units (struct TALER_MERCHANTDB_PostgresContext *pg, 93 const char *instance_id, 94 TALER_MERCHANTDB_UnitsCallback cb, 95 void *cb_cls) 96 { 97 struct LookupUnitsContext luc = { 98 .cb = cb, 99 .cb_cls = cb_cls, 100 .extract_failed = false 101 }; 102 struct GNUNET_PQ_QueryParam params[] = { 103 GNUNET_PQ_query_param_string (instance_id), 104 GNUNET_PQ_query_param_end 105 }; 106 enum GNUNET_DB_QueryStatus qs; 107 108 check_connection (pg); 109 PREPARE (pg, 110 "lookup_units", 111 "WITH mi AS (" 112 " SELECT merchant_serial FROM merchant_instances WHERE merchant_id=$1" 113 ")" 114 "SELECT cu.unit_serial" 115 " ,cu.unit" 116 " ,cu.unit_name_long" 117 " ,cu.unit_name_short" 118 " ,cu.unit_name_long_i18n" 119 " ,cu.unit_name_short_i18n" 120 " ,cu.unit_allow_fraction" 121 " ,cu.unit_precision_level" 122 " ,cu.unit_active" 123 " ,FALSE AS unit_builtin" 124 " FROM merchant_custom_units cu" 125 " JOIN mi ON cu.merchant_serial = mi.merchant_serial" 126 " UNION ALL " 127 "SELECT bu.unit_serial" 128 " ,bu.unit" 129 " ,bu.unit_name_long" 130 " ,bu.unit_name_short" 131 " ,bu.unit_name_long_i18n" 132 " ,bu.unit_name_short_i18n" 133 " ,COALESCE(bo.override_allow_fraction, bu.unit_allow_fraction)" 134 " ,COALESCE(bo.override_precision_level, bu.unit_precision_level)" 135 " ,COALESCE(bo.override_active, bu.unit_active)" 136 " ,TRUE AS unit_builtin" 137 " FROM merchant_builtin_units bu" 138 " JOIN mi ON TRUE" 139 " LEFT JOIN merchant_builtin_unit_overrides bo" 140 " ON bo.builtin_unit_serial = bu.unit_serial" 141 " AND bo.merchant_serial = mi.merchant_serial" 142 " ORDER BY unit"); 143 qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn, 144 "lookup_units", 145 params, 146 &lookup_units_cb, 147 &luc); 148 if (luc.extract_failed) 149 return GNUNET_DB_STATUS_HARD_ERROR; 150 return qs; 151 }