iterate_historic_denom_revenue.c (5286B)
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 iterate_historic_denom_revenue.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 "auditor-database/iterate_historic_denom_revenue.h" 23 #include "pg_helper.h" 24 25 26 /** 27 * Hard upper bound on the number of records returned by a single 28 * call, regardless of the limit requested by the client. 29 */ 30 #define MAX_RECORDS 50000 31 32 33 /** 34 * Closure for #historic_denom_revenue_cb(). 35 */ 36 struct HistoricDenomRevenueContext 37 { 38 /** 39 * Function to call for each result. 40 */ 41 TALER_AUDITORDB_HistoricDenominationRevenueDataCallback cb; 42 43 /** 44 * Closure for @e cb. 45 */ 46 void *cb_cls; 47 48 /** 49 * Plugin context. 50 */ 51 struct TALER_AUDITORDB_PostgresContext *pg; 52 53 /** 54 * Number of results processed. 55 */ 56 enum GNUNET_DB_QueryStatus qs; 57 }; 58 59 60 /** 61 * Helper function for #TALER_AUDITORDB_iterate_historic_denom_revenue(). 62 * To be called with the results of a SELECT statement 63 * that has returned @a num_results results. 64 * 65 * @param cls closure of type `struct HistoricRevenueContext *` 66 * @param result the postgres result 67 * @param num_results the number of results in @a result 68 */ 69 static void 70 historic_denom_revenue_cb (void *cls, 71 PGresult *result, 72 unsigned int num_results) 73 { 74 struct HistoricDenomRevenueContext *hrc = cls; 75 struct TALER_AUDITORDB_PostgresContext *pg = hrc->pg; 76 77 for (unsigned int i = 0; i < num_results; i++) 78 { 79 uint64_t rowid; 80 struct TALER_DenominationHashP denom_pub_hash; 81 struct GNUNET_TIME_Timestamp revenue_timestamp; 82 struct TALER_Amount revenue_balance; 83 struct TALER_Amount loss; 84 struct GNUNET_PQ_ResultSpec rs[] = { 85 GNUNET_PQ_result_spec_uint64 ("row_id", 86 &rowid), 87 GNUNET_PQ_result_spec_auto_from_type ("denom_pub_hash", 88 &denom_pub_hash), 89 GNUNET_PQ_result_spec_timestamp ("revenue_timestamp", 90 &revenue_timestamp), 91 TALER_PQ_RESULT_SPEC_AMOUNT ("revenue_balance", 92 &revenue_balance), 93 TALER_PQ_RESULT_SPEC_AMOUNT ("loss_balance", 94 &loss), 95 GNUNET_PQ_result_spec_end 96 }; 97 98 if (GNUNET_OK != 99 GNUNET_PQ_extract_result (result, 100 rs, 101 i)) 102 { 103 GNUNET_break (0); 104 hrc->qs = GNUNET_DB_STATUS_HARD_ERROR; 105 return; 106 } 107 108 hrc->qs = i + 1; 109 if (GNUNET_OK != 110 hrc->cb (hrc->cb_cls, 111 rowid, 112 &denom_pub_hash, 113 revenue_timestamp, 114 &revenue_balance, 115 &loss)) 116 break; 117 } 118 } 119 120 121 enum GNUNET_DB_QueryStatus 122 TALER_AUDITORDB_iterate_historic_denom_revenue ( 123 struct TALER_AUDITORDB_PostgresContext *pg, 124 int64_t limit, 125 uint64_t offset, 126 TALER_AUDITORDB_HistoricDenominationRevenueDataCallback cb, 127 void *cb_cls) 128 { 129 uint64_t ulimit = GNUNET_MIN ((uint64_t) MAX_RECORDS, 130 TALER_AUDITORDB_abs_limit (limit)); 131 struct GNUNET_PQ_QueryParam params[] = { 132 GNUNET_PQ_query_param_uint64 (&offset), 133 GNUNET_PQ_query_param_uint64 (&ulimit), 134 GNUNET_PQ_query_param_end 135 }; 136 struct HistoricDenomRevenueContext hrc = { 137 .cb = cb, 138 .cb_cls = cb_cls, 139 .pg = pg 140 }; 141 enum GNUNET_DB_QueryStatus qs; 142 143 PREPARE (pg, 144 "iterate_historic_denom_revenue_denomination_revenue_select_inc", 145 "SELECT" 146 " row_id" 147 ",denom_pub_hash" 148 ",revenue_timestamp" 149 ",revenue_balance" 150 ",loss_balance" 151 " FROM auditor_historic_denomination_revenue" 152 " WHERE row_id > $1" 153 " ORDER BY row_id ASC" 154 " LIMIT $2;"); 155 PREPARE (pg, 156 "iterate_historic_denom_revenue_denomination_revenue_select_dec", 157 "SELECT" 158 " row_id" 159 ",denom_pub_hash" 160 ",revenue_timestamp" 161 ",revenue_balance" 162 ",loss_balance" 163 " FROM auditor_historic_denomination_revenue" 164 " WHERE row_id < $1" 165 " ORDER BY row_id DESC" 166 " LIMIT $2;"); 167 qs = GNUNET_PQ_eval_prepared_multi_select ( 168 pg->conn, 169 limit > 0 170 ? "iterate_historic_denom_revenue_denomination_revenue_select_inc" 171 : "iterate_historic_denom_revenue_denomination_revenue_select_dec", 172 params, 173 &historic_denom_revenue_cb, 174 &hrc); 175 if (qs <= 0) 176 return qs; 177 return hrc.qs; 178 }