pg_select_exchange_credit_transfers.c (5843B)
1 /* 2 This file is part of TALER 3 Copyright (C) 2025 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 exchangedb/pg_select_exchange_credit_transfers.c 18 * @brief Implementation of the select_exchange_credit_transfers function for Postgres 19 * @author Christian Grothoff 20 */ 21 #include "taler/taler_pq_lib.h" 22 #include "taler/exchange-database/select_exchange_credit_transfers.h" 23 #include "helper.h" 24 25 /** 26 * Closure for #handle_aml_result. 27 */ 28 struct SelectTransferContext 29 { 30 /** 31 * Function to call on each result. 32 */ 33 TALER_EXCHANGEDB_AmlTransferCallback cb; 34 35 /** 36 * Closure for @e cb. 37 */ 38 void *cb_cls; 39 40 /** 41 * Plugin context. 42 */ 43 struct TALER_EXCHANGEDB_PostgresContext *pg; 44 45 /** 46 * Set to #GNUNET_SYSERR on serious errors. 47 */ 48 enum GNUNET_GenericReturnValue status; 49 }; 50 51 52 /** 53 * Function to be called with the results of a SELECT statement 54 * that has returned @a num_results results. Helper function 55 * for #TALER_EXCHANGEDB_select_exchange_debit_transfers(). 56 * 57 * @param cls closure of type `struct SelectTransferContext *` 58 * @param result the postgres result 59 * @param num_results the number of results in @a result 60 */ 61 static void 62 handle_transfer_result (void *cls, 63 PGresult *result, 64 unsigned int num_results) 65 { 66 struct SelectTransferContext *stc = cls; 67 struct TALER_EXCHANGEDB_PostgresContext *pg = stc->pg; 68 69 for (unsigned int i = 0; i<num_results; i++) 70 { 71 char *payto_uri; 72 uint64_t rowid; 73 struct GNUNET_TIME_Absolute execution_time; 74 struct TALER_Amount amount; 75 struct GNUNET_PQ_ResultSpec rs[] = { 76 GNUNET_PQ_result_spec_uint64 ("serial_id", 77 &rowid), 78 GNUNET_PQ_result_spec_string ("payto_uri", 79 &payto_uri), 80 GNUNET_PQ_result_spec_absolute_time ("execution_time", 81 &execution_time), 82 TALER_PQ_RESULT_SPEC_AMOUNT ("amount", 83 &amount), 84 GNUNET_PQ_result_spec_end 85 }; 86 87 if (GNUNET_OK != 88 GNUNET_PQ_extract_result (result, 89 rs, 90 i)) 91 { 92 GNUNET_break (0); 93 stc->status = GNUNET_SYSERR; 94 return; 95 } 96 stc->cb (stc->cb_cls, 97 rowid, 98 payto_uri, 99 execution_time, 100 &amount); 101 GNUNET_PQ_cleanup_result (rs); 102 } 103 } 104 105 106 enum GNUNET_DB_QueryStatus 107 TALER_EXCHANGEDB_select_exchange_credit_transfers ( 108 struct TALER_EXCHANGEDB_PostgresContext *pg, 109 const struct TALER_Amount *threshold, 110 uint64_t offset, 111 int64_t limit, 112 const struct TALER_NormalizedPaytoHashP *h_payto, 113 TALER_EXCHANGEDB_AmlTransferCallback cb, 114 void *cb_cls) 115 { 116 struct SelectTransferContext stc = { 117 .pg = pg, 118 .cb = cb, 119 .cb_cls = cb_cls, 120 .status = GNUNET_OK 121 }; 122 uint64_t ulimit = (limit > 0) ? limit : -limit; 123 struct GNUNET_PQ_QueryParam params[] = { 124 GNUNET_PQ_query_param_uint64 (&offset), 125 GNUNET_PQ_query_param_uint64 (&ulimit), 126 TALER_PQ_query_param_amount (pg->conn, 127 threshold), 128 NULL != h_payto 129 ? GNUNET_PQ_query_param_auto_from_type (h_payto) 130 : GNUNET_PQ_query_param_null (), 131 GNUNET_PQ_query_param_end 132 }; 133 enum GNUNET_DB_QueryStatus qs; 134 135 PREPARE (pg, 136 "select_exchange_credit_transfers_inc", 137 "SELECT" 138 " ri.reserve_in_serial_id AS serial_id" 139 ",wt.payto_uri" 140 ",ri.execution_date AS execution_time" 141 ",ri.credit AS amount" 142 " FROM reserves_in ri" 143 " LEFT JOIN wire_targets wt" 144 " ON (ri.wire_source_h_payto = wt.wire_target_h_payto)" 145 " WHERE (ri.reserve_in_serial_id > $1)" 146 " AND ( ($4::BYTEA IS NULL) OR (wt.h_normalized_payto=$4) )" 147 " AND ( ( (ri.credit).val > ($3::taler_amount).val)" 148 " OR ( ( (ri.credit).val >= ($3::taler_amount).val)" 149 " AND ( (ri.credit).frac >= ($3::taler_amount).frac) ) )" 150 " ORDER BY ri.reserve_in_serial_id ASC" 151 " LIMIT $2"); 152 PREPARE (pg, 153 "select_exchange_credit_transfers_dec", 154 "SELECT" 155 " ri.reserve_in_serial_id AS serial_id" 156 ",wt.payto_uri" 157 ",ri.execution_date AS execution_time" 158 ",ri.credit AS amount" 159 " FROM reserves_in ri" 160 " LEFT JOIN wire_targets wt" 161 " ON (ri.wire_source_h_payto = wt.wire_target_h_payto)" 162 " WHERE (ri.reserve_in_serial_id < $1)" 163 " AND ( ($4::BYTEA IS NULL) OR (wt.h_normalized_payto=$4) )" 164 " AND ( ( (ri.credit).val > ($3::taler_amount).val)" 165 " OR ( ( (ri.credit).val >= ($3::taler_amount).val)" 166 " AND ( (ri.credit).frac >= ($3::taler_amount).frac) ) )" 167 " ORDER BY ri.reserve_in_serial_id DESC" 168 " LIMIT $2"); 169 qs = GNUNET_PQ_eval_prepared_multi_select ( 170 pg->conn, 171 (limit > 0) 172 ? "select_exchange_credit_transfers_inc" 173 : "select_exchange_credit_transfers_dec", 174 params, 175 &handle_transfer_result, 176 &stc); 177 if (GNUNET_OK != stc.status) 178 return GNUNET_DB_STATUS_HARD_ERROR; 179 return qs; 180 }