pg_lookup_inventory_products.c (7951B)
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 backenddb/pg_lookup_inventory_products.c 18 * @brief Implementation of the lookup_inventory_products function for Postgres 19 * @author Bohdan Potuzhnyi 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_lookup_inventory_products.h" 26 #include "pg_helper.h" 27 28 /** 29 * Context used for TMH_PG_lookup_inventory_products(). 30 */ 31 struct LookupInventoryProductsContext 32 { 33 /** 34 * Function to call with the results. 35 */ 36 TALER_MERCHANTDB_InventoryProductCallback cb; 37 38 /** 39 * Closure for @a cb. 40 */ 41 void *cb_cls; 42 43 /** 44 * Postgres context. 45 */ 46 struct PostgresClosure *pg; 47 48 /** 49 * Did database result extraction fail? 50 */ 51 bool extract_failed; 52 }; 53 54 55 /** 56 * Function to be called with the results of a SELECT statement 57 * that has returned @a num_results results about products. 58 * 59 * @param[in,out] cls of type `struct LookupInventoryProductsContext *` 60 * @param result the postgres result 61 * @param num_results the number of results in @a result 62 */ 63 static void 64 lookup_inventory_products_cb (void *cls, 65 PGresult *result, 66 unsigned int num_results) 67 { 68 struct LookupInventoryProductsContext *plc = cls; 69 struct PostgresClosure *pg = plc->pg; 70 71 for (unsigned int i = 0; i < num_results; i++) 72 { 73 char *product_id; 74 struct TALER_MERCHANTDB_InventoryProductDetails pd; 75 size_t num_categories; 76 uint64_t *categories; 77 bool no_image_hash; 78 struct GNUNET_PQ_ResultSpec rs[] = { 79 GNUNET_PQ_result_spec_string ("product_id", 80 &product_id), 81 GNUNET_PQ_result_spec_string ("product_name", 82 &pd.product_name), 83 GNUNET_PQ_result_spec_string ("description", 84 &pd.description), 85 TALER_PQ_result_spec_json ("description_i18n", 86 &pd.description_i18n), 87 GNUNET_PQ_result_spec_string ("unit", 88 &pd.unit), 89 TALER_PQ_result_spec_array_amount_with_currency (pg->conn, 90 "price_array", 91 &pd.price_array_length, 92 &pd.price_array), 93 GNUNET_PQ_result_spec_uint64 ("remaining_stock", 94 &pd.remaining_stock), 95 GNUNET_PQ_result_spec_uint32 ("remaining_stock_frac", 96 &pd.remaining_stock_frac), 97 TALER_PQ_result_spec_json ("taxes", 98 &pd.taxes), 99 GNUNET_PQ_result_spec_allow_null ( 100 GNUNET_PQ_result_spec_string ("image_hash", 101 &pd.image_hash), 102 &no_image_hash), 103 GNUNET_PQ_result_spec_bool ("allow_fractional_quantity", 104 &pd.allow_fractional_quantity), 105 GNUNET_PQ_result_spec_uint32 ("fractional_precision_level", 106 &pd.fractional_precision_level), 107 GNUNET_PQ_result_spec_array_uint64 (pg->conn, 108 "categories", 109 &num_categories, 110 &categories), 111 GNUNET_PQ_result_spec_end 112 }; 113 114 if (GNUNET_OK != 115 GNUNET_PQ_extract_result (result, 116 rs, 117 i)) 118 { 119 GNUNET_break (0); 120 plc->extract_failed = true; 121 return; 122 } 123 plc->cb (plc->cb_cls, 124 product_id, 125 &pd, 126 num_categories, 127 categories); 128 GNUNET_PQ_cleanup_result (rs); 129 } 130 } 131 132 133 enum GNUNET_DB_QueryStatus 134 TMH_PG_lookup_inventory_products (void *cls, 135 const char *instance_id, 136 TALER_MERCHANTDB_InventoryProductCallback cb, 137 void *cb_cls) 138 { 139 struct PostgresClosure *pg = cls; 140 struct LookupInventoryProductsContext plc = { 141 .cb = cb, 142 .cb_cls = cb_cls, 143 .pg = pg, 144 /* Can be overwritten by the lookup_inventory_products_cb */ 145 .extract_failed = false, 146 }; 147 struct GNUNET_PQ_QueryParam params[] = { 148 GNUNET_PQ_query_param_string (instance_id), 149 GNUNET_PQ_query_param_end 150 }; 151 enum GNUNET_DB_QueryStatus qs; 152 153 check_connection (pg); 154 PREPARE (pg, 155 "lookup_inventory_products", 156 "SELECT" 157 " description" 158 ",description_i18n::TEXT" 159 ",product_name" 160 ",unit" 161 ",price_array" 162 ",CASE WHEN minv.total_stock = 9223372036854775807" 163 " THEN minv.total_stock" 164 " ELSE (GREATEST(0, rt.remaining_total) / 1000000)::INT8" 165 " END AS remaining_stock" 166 ",CASE WHEN minv.total_stock = 9223372036854775807" 167 " THEN 2147483647" 168 " ELSE mod(GREATEST(0, rt.remaining_total), 1000000)::INT4" 169 " END AS remaining_stock_frac" 170 ",taxes::TEXT" 171 ",image_hash" 172 ",allow_fractional_quantity" 173 ",fractional_precision_level" 174 ",product_id" 175 ",t.category_array AS categories" 176 " FROM merchant_inventory minv" 177 " JOIN merchant_instances inst" 178 " USING (merchant_serial)" 179 ",LATERAL (" 180 " SELECT ARRAY (" 181 " SELECT mpc.category_serial" 182 " FROM merchant_product_categories mpc" 183 " WHERE mpc.product_serial = minv.product_serial" 184 " ) AS category_array" 185 " ) t" 186 ",LATERAL (" 187 " SELECT COALESCE(SUM(total_locked::NUMERIC * 1000000" 188 " + total_locked_frac::NUMERIC), 0)" 189 " AS total_locked" 190 " FROM merchant_inventory_locks mil" 191 " WHERE mil.product_serial = minv.product_serial" 192 " ) il" 193 ",LATERAL (" 194 " SELECT COALESCE(SUM(total_locked::NUMERIC * 1000000" 195 " + total_locked_frac::NUMERIC), 0)" 196 " AS total_locked" 197 " FROM merchant_order_locks mol" 198 " WHERE mol.product_serial = minv.product_serial" 199 " ) ol" 200 ",LATERAL (" 201 " SELECT" 202 " (minv.total_stock::NUMERIC * 1000000" 203 " + minv.total_stock_frac::NUMERIC)" 204 " - (minv.total_sold::NUMERIC * 1000000" 205 " + minv.total_sold_frac::NUMERIC)" 206 " - (minv.total_lost::NUMERIC * 1000000" 207 " + minv.total_lost_frac::NUMERIC)" 208 " - il.total_locked" 209 " - ol.total_locked" 210 " AS remaining_total" 211 " ) rt" 212 " WHERE inst.merchant_id=$1"); 213 qs = GNUNET_PQ_eval_prepared_multi_select ( 214 pg->conn, 215 "lookup_inventory_products", 216 params, 217 &lookup_inventory_products_cb, 218 &plc); 219 /* If there was an error inside lookup_inventory_products_cb, return a hard error. */ 220 if (plc.extract_failed) 221 return GNUNET_DB_STATUS_HARD_ERROR; 222 return qs; 223 }