pg_get_unfinished_close_requests.c (4909B)
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/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_get_unfinished_close_requests.h" 26 #include "pg_helper.h" 27 28 29 /** 30 * Closure for #reserve_close_cb(). 31 */ 32 struct CloseReserveContext 33 { 34 /** 35 * Function to call for each to be closed reserve. 36 */ 37 TALER_EXCHANGEDB_ReserveExpiredCallback rec; 38 39 /** 40 * Closure to give to @e rec. 41 */ 42 void *rec_cls; 43 44 /** 45 * Plugin context. 46 */ 47 struct PostgresClosure *pg; 48 49 /** 50 * Set to #GNUNET_SYSERR on error. 51 */ 52 enum GNUNET_GenericReturnValue status; 53 }; 54 55 56 /** 57 * Function to be called with the results of a SELECT statement 58 * that has returned @a num_results results. 59 * 60 * @param cls closure 61 * @param result the postgres result 62 * @param num_results the number of results in @a result 63 */ 64 static void 65 reserve_cb (void *cls, 66 PGresult *result, 67 unsigned int num_results) 68 { 69 struct CloseReserveContext *erc = cls; 70 struct PostgresClosure *pg = erc->pg; 71 enum GNUNET_GenericReturnValue ret = GNUNET_OK; 72 73 for (unsigned int i = 0; i<num_results; i++) 74 { 75 struct GNUNET_TIME_Timestamp exp_date; 76 struct TALER_FullPayto account_details; 77 struct TALER_ReservePublicKeyP reserve_pub; 78 struct TALER_Amount remaining_balance; 79 uint64_t close_request_row; 80 struct GNUNET_PQ_ResultSpec rs[] = { 81 GNUNET_PQ_result_spec_timestamp ("expiration_date", 82 &exp_date), 83 GNUNET_PQ_result_spec_string ("account_details", 84 &account_details.full_payto), 85 GNUNET_PQ_result_spec_auto_from_type ("reserve_pub", 86 &reserve_pub), 87 TALER_PQ_RESULT_SPEC_AMOUNT ("close", 88 &remaining_balance), 89 GNUNET_PQ_result_spec_uint64 ("close_request_serial_id", 90 &close_request_row), 91 GNUNET_PQ_result_spec_end 92 }; 93 94 if (GNUNET_OK != 95 GNUNET_PQ_extract_result (result, 96 rs, 97 i)) 98 { 99 GNUNET_break (0); 100 ret = GNUNET_SYSERR; 101 break; 102 } 103 ret = erc->rec (erc->rec_cls, 104 &reserve_pub, 105 &remaining_balance, 106 account_details, 107 exp_date, 108 close_request_row); 109 GNUNET_PQ_cleanup_result (rs); 110 if (GNUNET_OK != ret) 111 break; 112 } 113 erc->status = ret; 114 } 115 116 117 enum GNUNET_DB_QueryStatus 118 TEH_PG_get_unfinished_close_requests ( 119 void *cls, 120 TALER_EXCHANGEDB_ReserveExpiredCallback rec, 121 void *rec_cls) 122 { 123 struct PostgresClosure *pg = cls; 124 struct GNUNET_PQ_QueryParam params[] = { 125 GNUNET_PQ_query_param_end 126 }; 127 struct CloseReserveContext ectx = { 128 .rec = rec, 129 .rec_cls = rec_cls, 130 .pg = pg, 131 .status = GNUNET_OK 132 }; 133 enum GNUNET_DB_QueryStatus qs; 134 135 PREPARE (pg, 136 "get_unfinished_close_requests", 137 "UPDATE close_requests AS rc" 138 " SET done=TRUE" 139 " WHERE NOT done" 140 " RETURNING" 141 " reserve_pub" 142 " ,close_request_serial_id" 143 " ,close_timestamp AS expiration_date" 144 " ,close" 145 " ,(SELECT payto_uri" 146 " FROM reserves_in ri" 147 " JOIN wire_targets wt" 148 " ON (ri.wire_source_h_payto = wt.wire_target_h_payto)" 149 " WHERE ri.reserve_pub=rc.reserve_pub)" 150 " AS account_details;"); 151 qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn, 152 "get_unfinished_close_requests", 153 params, 154 &reserve_cb, 155 &ectx); 156 switch (ectx.status) 157 { 158 case GNUNET_SYSERR: 159 return GNUNET_DB_STATUS_HARD_ERROR; 160 case GNUNET_NO: 161 return GNUNET_DB_STATUS_SOFT_ERROR; 162 case GNUNET_OK: 163 break; 164 } 165 return qs; 166 }