taler-merchant-httpd_post-private-categories.c (6354B)
1 /* 2 This file is part of TALER 3 (C) 2024 Taler Systems SA 4 5 TALER is free software; you can redistribute it and/or modify 6 it under the terms of the GNU Affero General Public License as 7 published by the Free Software Foundation; either version 3, 8 or (at your option) any later version. 9 10 TALER is distributed in the hope that it will be useful, but 11 WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public 16 License along with TALER; see the file COPYING. If not, 17 see <http://www.gnu.org/licenses/> 18 */ 19 /** 20 * @file src/backend/taler-merchant-httpd_post-private-categories.c 21 * @brief implementing POST /private/categories request handling 22 * @author Christian Grothoff 23 */ 24 #include "platform.h" 25 #include "taler-merchant-httpd_post-private-categories.h" 26 #include "taler-merchant-httpd_helper.h" 27 #include <taler/taler_json_lib.h> 28 #include "merchant-database/insert_category.h" 29 #include "merchant-database/select_category_by_name.h" 30 #include "merchant-database/start.h" 31 32 /** 33 * How often do we retry the simple INSERT database transaction? 34 */ 35 #define MAX_RETRIES 3 36 37 38 enum MHD_Result 39 TMH_private_post_categories (const struct TMH_RequestHandler *rh, 40 struct MHD_Connection *connection, 41 struct TMH_HandlerContext *hc) 42 { 43 struct TMH_MerchantInstance *mi = hc->instance; 44 const char *category_name; 45 const json_t *category_name_i18n = NULL; 46 json_t *oempty = NULL; 47 uint64_t category_id; 48 struct GNUNET_JSON_Specification spec[] = { 49 GNUNET_JSON_spec_string ("name", 50 &category_name), 51 GNUNET_JSON_spec_mark_optional ( 52 GNUNET_JSON_spec_object_const ("name_i18n", 53 &category_name_i18n), 54 NULL), 55 GNUNET_JSON_spec_end () 56 }; 57 enum GNUNET_DB_QueryStatus qs; 58 59 GNUNET_assert (NULL != mi); 60 { 61 enum GNUNET_GenericReturnValue res; 62 63 res = TALER_MHD_parse_json_data (connection, 64 hc->request_body, 65 spec); 66 if (GNUNET_OK != res) 67 { 68 GNUNET_break_op (0); 69 return (GNUNET_NO == res) 70 ? MHD_YES 71 : MHD_NO; 72 } 73 } 74 if (NULL == category_name_i18n) 75 { 76 /* NULL is not allowed in the DB, substitute with empty object */ 77 oempty = json_object (); 78 category_name_i18n = oempty; 79 } 80 /* finally, interact with DB until no serialization error */ 81 for (unsigned int i = 0; i<MAX_RETRIES; i++) 82 { 83 json_t *xcategory_name_i18n; 84 85 if (GNUNET_OK != 86 TALER_MERCHANTDB_start (TMH_db, 87 "POST /categories")) 88 { 89 GNUNET_break (0); 90 GNUNET_JSON_parse_free (spec); 91 json_decref (oempty); 92 return TALER_MHD_reply_with_error (connection, 93 MHD_HTTP_INTERNAL_SERVER_ERROR, 94 TALER_EC_GENERIC_DB_START_FAILED, 95 NULL); 96 } 97 qs = TALER_MERCHANTDB_select_category_by_name (TMH_db, 98 mi->settings.id, 99 category_name, 100 &xcategory_name_i18n, 101 &category_id); 102 switch (qs) 103 { 104 case GNUNET_DB_STATUS_HARD_ERROR: 105 /* Clean up and fail hard */ 106 GNUNET_break (0); 107 TALER_MERCHANTDB_rollback (TMH_db); 108 GNUNET_JSON_parse_free (spec); 109 json_decref (oempty); 110 return TALER_MHD_reply_with_error (connection, 111 MHD_HTTP_INTERNAL_SERVER_ERROR, 112 TALER_EC_GENERIC_DB_FETCH_FAILED, 113 NULL); 114 case GNUNET_DB_STATUS_SOFT_ERROR: 115 /* restart transaction */ 116 goto retry; 117 case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS: 118 /* Good, we can proceed! */ 119 break; 120 case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT: 121 /* idempotency check: is etp == tp? */ 122 { 123 bool eq; 124 125 eq = (1 == json_equal (xcategory_name_i18n, 126 category_name_i18n)); 127 json_decref (xcategory_name_i18n); 128 TALER_MERCHANTDB_rollback (TMH_db); 129 GNUNET_JSON_parse_free (spec); 130 json_decref (oempty); 131 return eq 132 ? TALER_MHD_REPLY_JSON_PACK (connection, 133 MHD_HTTP_OK, 134 GNUNET_JSON_pack_uint64 ("category_id", 135 category_id)) 136 : TALER_MHD_reply_with_error (connection, 137 MHD_HTTP_CONFLICT, 138 TALER_EC_MERCHANT_PRIVATE_POST_CATEGORIES_CONFLICT_CATEGORY_EXISTS, 139 category_name); 140 } 141 } /* end switch (qs) */ 142 143 qs = TALER_MERCHANTDB_insert_category (TMH_db, 144 mi->settings.id, 145 category_name, 146 category_name_i18n, 147 &category_id); 148 if (GNUNET_DB_STATUS_HARD_ERROR == qs) 149 { 150 TALER_MERCHANTDB_rollback (TMH_db); 151 break; 152 } 153 if (GNUNET_DB_STATUS_SUCCESS_ONE_RESULT == qs) 154 { 155 qs = TALER_MERCHANTDB_commit (TMH_db); 156 if (GNUNET_DB_STATUS_SOFT_ERROR != qs) 157 break; 158 } 159 retry: 160 GNUNET_assert (GNUNET_DB_STATUS_SOFT_ERROR == qs); 161 TALER_MERCHANTDB_rollback (TMH_db); 162 } /* for RETRIES loop */ 163 json_decref (oempty); 164 GNUNET_JSON_parse_free (spec); 165 if (qs < 0) 166 { 167 GNUNET_break (0); 168 return TALER_MHD_reply_with_error ( 169 connection, 170 MHD_HTTP_INTERNAL_SERVER_ERROR, 171 (GNUNET_DB_STATUS_SOFT_ERROR == qs) 172 ? TALER_EC_GENERIC_DB_SOFT_FAILURE 173 : TALER_EC_GENERIC_DB_COMMIT_FAILED, 174 NULL); 175 } 176 return TALER_MHD_REPLY_JSON_PACK ( 177 connection, 178 MHD_HTTP_OK, 179 GNUNET_JSON_pack_uint64 ("category_id", 180 category_id)); 181 } 182 183 184 /* end of taler-merchant-httpd_post-private-categories.c */