pg_get_unfinished_close_requests.c (4870B)
1 /* 2 This file is part of TALER 3 Copyright (C) 2022, 2024 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 pg_get_unfinished_close_requests.c 18 * @brief Low-level (statement-level) Postgres database access for the exchange 19 * @author Christian Grothoff 20 */ 21 #include "taler/taler_pq_lib.h" 22 #include "taler/exchange-database/get_unfinished_close_requests.h" 23 #include "helper.h" 24 25 26 /** 27 * Closure for #reserve_close_cb(). 28 */ 29 struct CloseReserveContext 30 { 31 /** 32 * Function to call for each to be closed reserve. 33 */ 34 TALER_EXCHANGEDB_ReserveExpiredCallback rec; 35 36 /** 37 * Closure to give to @e rec. 38 */ 39 void *rec_cls; 40 41 /** 42 * Plugin context. 43 */ 44 struct TALER_EXCHANGEDB_PostgresContext *pg; 45 46 /** 47 * Set to #GNUNET_SYSERR on error. 48 */ 49 enum GNUNET_GenericReturnValue status; 50 }; 51 52 53 /** 54 * Function to be called with the results of a SELECT statement 55 * that has returned @a num_results results. 56 * 57 * @param cls closure 58 * @param result the postgres result 59 * @param num_results the number of results in @a result 60 */ 61 static void 62 reserve_cb (void *cls, 63 PGresult *result, 64 unsigned int num_results) 65 { 66 struct CloseReserveContext *erc = cls; 67 struct TALER_EXCHANGEDB_PostgresContext *pg = erc->pg; 68 enum GNUNET_GenericReturnValue ret = GNUNET_OK; 69 70 for (unsigned int i = 0; i<num_results; i++) 71 { 72 struct GNUNET_TIME_Timestamp exp_date; 73 struct TALER_FullPayto account_details; 74 struct TALER_ReservePublicKeyP reserve_pub; 75 struct TALER_Amount remaining_balance; 76 uint64_t close_request_row; 77 struct GNUNET_PQ_ResultSpec rs[] = { 78 GNUNET_PQ_result_spec_timestamp ("expiration_date", 79 &exp_date), 80 GNUNET_PQ_result_spec_string ("account_details", 81 &account_details.full_payto), 82 GNUNET_PQ_result_spec_auto_from_type ("reserve_pub", 83 &reserve_pub), 84 TALER_PQ_RESULT_SPEC_AMOUNT ("close", 85 &remaining_balance), 86 GNUNET_PQ_result_spec_uint64 ("close_request_serial_id", 87 &close_request_row), 88 GNUNET_PQ_result_spec_end 89 }; 90 91 if (GNUNET_OK != 92 GNUNET_PQ_extract_result (result, 93 rs, 94 i)) 95 { 96 GNUNET_break (0); 97 ret = GNUNET_SYSERR; 98 break; 99 } 100 ret = erc->rec (erc->rec_cls, 101 &reserve_pub, 102 &remaining_balance, 103 account_details, 104 exp_date, 105 close_request_row); 106 GNUNET_PQ_cleanup_result (rs); 107 if (GNUNET_OK != ret) 108 break; 109 } 110 erc->status = ret; 111 } 112 113 114 enum GNUNET_DB_QueryStatus 115 TALER_EXCHANGEDB_get_unfinished_close_requests ( 116 struct TALER_EXCHANGEDB_PostgresContext *pg, 117 TALER_EXCHANGEDB_ReserveExpiredCallback rec, 118 void *rec_cls) 119 { 120 struct GNUNET_PQ_QueryParam params[] = { 121 GNUNET_PQ_query_param_end 122 }; 123 struct CloseReserveContext ectx = { 124 .rec = rec, 125 .rec_cls = rec_cls, 126 .pg = pg, 127 .status = GNUNET_OK 128 }; 129 enum GNUNET_DB_QueryStatus qs; 130 131 PREPARE (pg, 132 "get_unfinished_close_requests", 133 "UPDATE close_requests AS rc" 134 " SET done=TRUE" 135 " WHERE NOT done" 136 " RETURNING" 137 " reserve_pub" 138 " ,close_request_serial_id" 139 " ,close_timestamp AS expiration_date" 140 " ,close" 141 " ,(SELECT payto_uri" 142 " FROM reserves_in ri" 143 " JOIN wire_targets wt" 144 " ON (ri.wire_source_h_payto = wt.wire_target_h_payto)" 145 " WHERE ri.reserve_pub=rc.reserve_pub)" 146 " AS account_details;"); 147 qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn, 148 "get_unfinished_close_requests", 149 params, 150 &reserve_cb, 151 &ectx); 152 switch (ectx.status) 153 { 154 case GNUNET_SYSERR: 155 return GNUNET_DB_STATUS_HARD_ERROR; 156 case GNUNET_NO: 157 return GNUNET_DB_STATUS_SOFT_ERROR; 158 case GNUNET_OK: 159 break; 160 } 161 return qs; 162 }