iterate_products.c (6941B)
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/iterate_products.c 18 * @brief Implementation of the iterate_products function for Postgres 19 * @author Iván Ávalos 20 */ 21 #include "platform.h" 22 #include <taler/taler_pq_lib.h> 23 #include "merchant-database/iterate_products.h" 24 #include "helper.h" 25 26 27 /** 28 * Hard upper bound on the number of records returned by a single 29 * call, regardless of the limit requested by the client. 30 */ 31 #define MAX_RECORDS 50000 32 33 34 /** 35 * Context used for TALER_MERCHANTDB_iterate_products(). 36 */ 37 struct LookupProductsContext 38 { 39 /** 40 * Function to call with the results. 41 */ 42 TALER_MERCHANTDB_ProductsCallback cb; 43 44 /** 45 * Closure for @a cb. 46 */ 47 void *cb_cls; 48 49 /** 50 * Did database result extraction fail? 51 */ 52 bool extract_failed; 53 }; 54 55 56 /** 57 * Function to be called with the results of a SELECT statement 58 * that has returned @a num_results results about products. 59 * 60 * @param[in,out] cls of type `struct LookupProductsContext *` 61 * @param result the postgres result 62 * @param num_results the number of results in @a result 63 */ 64 static void 65 lookup_products_cb (void *cls, 66 PGresult *result, 67 unsigned int num_results) 68 { 69 struct LookupProductsContext *plc = cls; 70 71 for (unsigned int i = 0; i < num_results; i++) 72 { 73 char *product_id; 74 uint64_t product_serial; 75 struct GNUNET_PQ_ResultSpec rs[] = { 76 GNUNET_PQ_result_spec_string ("product_id", 77 &product_id), 78 GNUNET_PQ_result_spec_uint64 ("product_serial", 79 &product_serial), 80 GNUNET_PQ_result_spec_end 81 }; 82 83 if (GNUNET_OK != 84 GNUNET_PQ_extract_result (result, 85 rs, 86 i)) 87 { 88 GNUNET_break (0); 89 plc->extract_failed = true; 90 return; 91 } 92 plc->cb (plc->cb_cls, 93 product_serial, 94 product_id); 95 GNUNET_PQ_cleanup_result (rs); 96 } 97 } 98 99 100 enum GNUNET_DB_QueryStatus 101 TALER_MERCHANTDB_iterate_products ( 102 struct TALER_MERCHANTDB_PostgresContext *pg, 103 const char *instance_id, 104 uint64_t offset, 105 int64_t limit, 106 const char *category_filter, 107 const char *name_filter, 108 const char *description_filter, 109 uint64_t product_group_id_filter, 110 TALER_MERCHANTDB_ProductsCallback cb, 111 void *cb_cls) 112 { 113 uint64_t plimit = GNUNET_MIN ((uint64_t) MAX_RECORDS, 114 TALER_MERCHANTDB_abs_limit (limit)); 115 struct LookupProductsContext plc = { 116 .cb = cb, 117 .cb_cls = cb_cls, 118 /* Can be overwritten by the lookup_products_cb */ 119 .extract_failed = false, 120 }; 121 struct GNUNET_PQ_QueryParam params[] = { 122 GNUNET_PQ_query_param_uint64 (&offset), 123 NULL == category_filter 124 ? GNUNET_PQ_query_param_null () 125 : GNUNET_PQ_query_param_string (category_filter), 126 NULL == name_filter 127 ? GNUNET_PQ_query_param_null () 128 : GNUNET_PQ_query_param_string (name_filter), 129 NULL == description_filter 130 ? GNUNET_PQ_query_param_null () 131 : GNUNET_PQ_query_param_string (description_filter), 132 GNUNET_PQ_query_param_uint64 (&plimit), 133 GNUNET_PQ_query_param_uint64 (&product_group_id_filter), 134 GNUNET_PQ_query_param_end 135 }; 136 enum GNUNET_DB_QueryStatus qs; 137 138 GNUNET_assert (NULL != pg->current_merchant_id); 139 GNUNET_assert (0 == strcmp (instance_id, 140 pg->current_merchant_id)); 141 if (limit > 0) 142 { 143 TMH_PQ_prepare_anon (pg, 144 "SELECT" 145 " product_id" 146 " ,product_serial" 147 " FROM merchant_inventory" 148 " WHERE product_serial > $1" 149 " AND ( ($2::TEXT IS NULL) OR" 150 " (product_serial IN" 151 " (SELECT product_serial" 152 " FROM merchant_product_categories" 153 " WHERE category_serial IN" 154 " (SELECT category_serial" 155 " FROM merchant_categories" 156 " WHERE LOWER(category_name) LIKE LOWER($2)))) )" 157 " AND ( (0 = $6::INT8) OR" 158 " (product_group_serial = $6) )" 159 " AND ( ($3::TEXT IS NULL) OR" 160 " (LOWER(product_name) LIKE LOWER($3)) )" 161 " AND ( ($4::TEXT IS NULL) OR" 162 " (description LIKE LOWER($4)) )" 163 " ORDER BY product_serial ASC" 164 " LIMIT $5"); 165 } 166 else 167 { 168 TMH_PQ_prepare_anon (pg, 169 "SELECT" 170 " product_id" 171 " ,product_serial" 172 " FROM merchant_inventory" 173 " WHERE product_serial < $1" 174 " AND ( ($2::TEXT IS NULL) OR" 175 " (product_serial IN" 176 " (SELECT product_serial" 177 " FROM merchant_product_categories" 178 " WHERE category_serial IN" 179 " (SELECT category_serial" 180 " FROM merchant_categories" 181 " WHERE LOWER(category_name) LIKE LOWER($2)))) )" 182 " AND ( (0 = $6::INT8) OR" 183 " (product_group_serial = $6) )" 184 " AND ( ($3::TEXT IS NULL) OR" 185 " (LOWER(product_name) LIKE LOWER($3)) )" 186 " AND ( ($4::TEXT IS NULL) OR" 187 " (description LIKE LOWER($4)) )" 188 " ORDER BY product_serial DESC" 189 " LIMIT $5"); 190 } 191 qs = GNUNET_PQ_eval_prepared_multi_select ( 192 pg->conn, 193 "", 194 params, 195 &lookup_products_cb, 196 &plc); 197 /* If there was an error inside lookup_products_cb, return a hard error. */ 198 if (plc.extract_failed) 199 { 200 GNUNET_break (0); 201 return GNUNET_DB_STATUS_HARD_ERROR; 202 } 203 return qs; 204 }