get_global_fees.c (5188B)
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 exchangedb/get_global_fees.c 18 * @brief Implementation of the get_global_fees function for Postgres 19 * @author Christian Grothoff 20 */ 21 #include "taler/taler_error_codes.h" 22 #include "taler/taler_dbevents.h" 23 #include "taler/taler_pq_lib.h" 24 #include "exchange-database/get_global_fees.h" 25 #include "helper.h" 26 27 28 /** 29 * Closure for #global_fees_cb(). 30 */ 31 struct GlobalFeeContext 32 { 33 /** 34 * Function to call for each global fee block. 35 */ 36 TALER_EXCHANGEDB_GlobalFeeCallback cb; 37 38 /** 39 * Closure to give to @e rec. 40 */ 41 void *cb_cls; 42 43 /** 44 * Plugin context. 45 */ 46 struct TALER_EXCHANGEDB_PostgresContext *pg; 47 48 /** 49 * Set to #GNUNET_SYSERR on error. 50 */ 51 enum GNUNET_GenericReturnValue status; 52 }; 53 54 55 /** 56 * Function to be called with the results of a SELECT statement 57 * that has returned @a num_results results. 58 * 59 * @param cls closure 60 * @param result the postgres result 61 * @param num_results the number of results in @a result 62 */ 63 static void 64 global_fees_cb (void *cls, 65 PGresult *result, 66 unsigned int num_results) 67 { 68 struct GlobalFeeContext *gctx = cls; 69 struct TALER_EXCHANGEDB_PostgresContext *pg = gctx->pg; 70 71 for (unsigned int i = 0; i<num_results; i++) 72 { 73 struct TALER_GlobalFeeSet fees; 74 struct GNUNET_TIME_Relative purse_timeout; 75 struct GNUNET_TIME_Relative history_expiration; 76 uint32_t purse_account_limit; 77 struct GNUNET_TIME_Timestamp start_date; 78 struct GNUNET_TIME_Timestamp end_date; 79 struct TALER_MasterSignatureP master_sig; 80 struct GNUNET_PQ_ResultSpec rs[] = { 81 GNUNET_PQ_result_spec_timestamp ("start_date", 82 &start_date), 83 GNUNET_PQ_result_spec_timestamp ("end_date", 84 &end_date), 85 TALER_PQ_RESULT_SPEC_AMOUNT ("history_fee", 86 &fees.history), 87 TALER_PQ_RESULT_SPEC_AMOUNT ("account_fee", 88 &fees.account), 89 TALER_PQ_RESULT_SPEC_AMOUNT ("purse_fee", 90 &fees.purse), 91 GNUNET_PQ_result_spec_relative_time ("purse_timeout", 92 &purse_timeout), 93 GNUNET_PQ_result_spec_relative_time ("history_expiration", 94 &history_expiration), 95 GNUNET_PQ_result_spec_uint32 ("purse_account_limit", 96 &purse_account_limit), 97 GNUNET_PQ_result_spec_auto_from_type ("master_sig", 98 &master_sig), 99 GNUNET_PQ_result_spec_end 100 }; 101 if (GNUNET_OK != 102 GNUNET_PQ_extract_result (result, 103 rs, 104 i)) 105 { 106 GNUNET_break (0); 107 gctx->status = GNUNET_SYSERR; 108 break; 109 } 110 gctx->cb (gctx->cb_cls, 111 &fees, 112 purse_timeout, 113 history_expiration, 114 purse_account_limit, 115 start_date, 116 end_date, 117 &master_sig); 118 GNUNET_PQ_cleanup_result (rs); 119 } 120 } 121 122 123 enum GNUNET_DB_QueryStatus 124 TALER_TALER_EXCHANGEDB_get_global_fees (struct 125 TALER_EXCHANGEDB_PostgresContext *pg, 126 TALER_EXCHANGEDB_GlobalFeeCallback cb, 127 void *cb_cls) 128 { 129 struct GNUNET_TIME_Timestamp date 130 = GNUNET_TIME_absolute_to_timestamp ( 131 GNUNET_TIME_absolute_subtract ( 132 GNUNET_TIME_absolute_get (), 133 GNUNET_TIME_UNIT_YEARS)); 134 struct GNUNET_PQ_QueryParam params[] = { 135 GNUNET_PQ_query_param_timestamp (&date), 136 GNUNET_PQ_query_param_end 137 }; 138 struct GlobalFeeContext gctx = { 139 .cb = cb, 140 .cb_cls = cb_cls, 141 .pg = pg, 142 .status = GNUNET_OK 143 }; 144 145 PREPARE (pg, 146 "get_global_fees", 147 "SELECT " 148 " start_date" 149 ",end_date" 150 ",history_fee" 151 ",account_fee" 152 ",purse_fee" 153 ",purse_timeout" 154 ",history_expiration" 155 ",purse_account_limit" 156 ",master_sig" 157 " FROM global_fee" 158 " WHERE start_date >= $1"); 159 return GNUNET_PQ_eval_prepared_multi_select (pg->conn, 160 "get_global_fees", 161 params, 162 &global_fees_cb, 163 &gctx); 164 }