pg_lookup_products.c (6282B)
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 backenddb/pg_lookup_products.c 18 * @brief Implementation of the lookup_products function for Postgres 19 * @author Iván Ávalos 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 "pg_lookup_products.h" 26 #include "pg_helper.h" 27 28 /** 29 * Context used for TMH_PG_lookup_products(). 30 */ 31 struct LookupProductsContext 32 { 33 /** 34 * Function to call with the results. 35 */ 36 TALER_MERCHANTDB_ProductsCallback cb; 37 38 /** 39 * Closure for @a cb. 40 */ 41 void *cb_cls; 42 43 /** 44 * Did database result extraction fail? 45 */ 46 bool extract_failed; 47 }; 48 49 50 /** 51 * Function to be called with the results of a SELECT statement 52 * that has returned @a num_results results about products. 53 * 54 * @param[in,out] cls of type `struct LookupProductsContext *` 55 * @param result the postgres result 56 * @param num_results the number of results in @a result 57 */ 58 static void 59 lookup_products_cb (void *cls, 60 PGresult *result, 61 unsigned int num_results) 62 { 63 struct LookupProductsContext *plc = cls; 64 65 for (unsigned int i = 0; i < num_results; i++) 66 { 67 char *product_id; 68 uint64_t product_serial; 69 struct GNUNET_PQ_ResultSpec rs[] = { 70 GNUNET_PQ_result_spec_string ("product_id", 71 &product_id), 72 GNUNET_PQ_result_spec_uint64 ("product_serial", 73 &product_serial), 74 GNUNET_PQ_result_spec_end 75 }; 76 77 if (GNUNET_OK != 78 GNUNET_PQ_extract_result (result, 79 rs, 80 i)) 81 { 82 GNUNET_break (0); 83 plc->extract_failed = true; 84 return; 85 } 86 plc->cb (plc->cb_cls, 87 product_serial, 88 product_id); 89 GNUNET_PQ_cleanup_result (rs); 90 } 91 } 92 93 94 enum GNUNET_DB_QueryStatus 95 TMH_PG_lookup_products (void *cls, 96 const char *instance_id, 97 uint64_t offset, 98 int64_t limit, 99 const char *category_filter, 100 const char *name_filter, 101 const char *description_filter, 102 TALER_MERCHANTDB_ProductsCallback cb, 103 void *cb_cls) 104 { 105 struct PostgresClosure *pg = cls; 106 uint64_t plimit = (uint64_t) ((limit < 0) ? -limit : limit); 107 struct LookupProductsContext plc = { 108 .cb = cb, 109 .cb_cls = cb_cls, 110 /* Can be overwritten by the lookup_products_cb */ 111 .extract_failed = false, 112 }; 113 struct GNUNET_PQ_QueryParam params[] = { 114 GNUNET_PQ_query_param_string (instance_id), 115 GNUNET_PQ_query_param_uint64 (&offset), 116 NULL == category_filter 117 ? GNUNET_PQ_query_param_null () 118 : GNUNET_PQ_query_param_string (category_filter), 119 NULL == name_filter 120 ? GNUNET_PQ_query_param_null () 121 : GNUNET_PQ_query_param_string (name_filter), 122 NULL == description_filter 123 ? GNUNET_PQ_query_param_null () 124 : GNUNET_PQ_query_param_string (description_filter), 125 GNUNET_PQ_query_param_uint64 (&plimit), 126 GNUNET_PQ_query_param_end 127 }; 128 enum GNUNET_DB_QueryStatus qs; 129 130 check_connection (pg); 131 PREPARE (pg, 132 "lookup_products_asc", 133 "SELECT" 134 " product_id" 135 " ,product_serial" 136 " FROM merchant_inventory" 137 " JOIN merchant_instances" 138 " USING (merchant_serial)" 139 " WHERE merchant_instances.merchant_id=$1" 140 " AND product_serial > $2" 141 " AND ( ($3::TEXT IS NULL) OR" 142 " (product_serial IN" 143 " (SELECT product_serial" 144 " FROM merchant_product_categories" 145 " WHERE category_serial IN" 146 " (SELECT category_serial" 147 " FROM merchant_categories" 148 " WHERE category_name LIKE LOWER($3)))) )" 149 " AND ( ($4::TEXT IS NULL) OR" 150 " (product_name LIKE LOWER($4)) )" 151 " AND ( ($5::TEXT IS NULL) OR" 152 " (description LIKE LOWER($5)) )" 153 " ORDER BY product_serial ASC" 154 " LIMIT $6"); 155 PREPARE (pg, 156 "lookup_products_desc", 157 "SELECT" 158 " product_id" 159 " ,product_serial" 160 " FROM merchant_inventory" 161 " JOIN merchant_instances" 162 " USING (merchant_serial)" 163 " WHERE merchant_instances.merchant_id=$1" 164 " AND product_serial < $2" 165 " AND ( ($3::TEXT IS NULL) OR" 166 " (product_serial IN" 167 " (SELECT product_serial" 168 " FROM merchant_product_categories" 169 " WHERE category_serial IN" 170 " (SELECT category_serial" 171 " FROM merchant_categories" 172 " WHERE category_name LIKE LOWER($3)))) )" 173 " AND ( ($4::TEXT IS NULL) OR" 174 " (product_name LIKE LOWER($4)) )" 175 " AND ( ($5::TEXT IS NULL) OR" 176 " (description LIKE LOWER($5)) )" 177 " ORDER BY product_serial DESC" 178 " LIMIT $6"); 179 qs = GNUNET_PQ_eval_prepared_multi_select ( 180 pg->conn, 181 (limit > 0) 182 ? "lookup_products_asc" 183 : "lookup_products_desc", 184 params, 185 &lookup_products_cb, 186 &plc); 187 /* If there was an error inside lookup_products_cb, return a hard error. */ 188 if (plc.extract_failed) 189 { 190 GNUNET_break (0); 191 return GNUNET_DB_STATUS_HARD_ERROR; 192 } 193 return qs; 194 }