helper.h (4079B)
1 /* 2 This file is part of TALER 3 Copyright (C) 2023 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 helper.h 18 * @brief shared internal definitions for postgres DB plugin 19 * @author Johannes Casaburi 20 */ 21 #ifndef PG_HELPER_H 22 #define PG_HELPER_H 23 24 #include "donaudb_lib.h" 25 26 27 /** 28 * Type of the "cls" argument given to each of the functions in 29 * our API. 30 */ 31 struct DONAUDB_PostgresContext 32 { 33 34 /** 35 * Our configuration. 36 */ 37 const struct GNUNET_CONFIGURATION_Handle *cfg; 38 39 /** 40 * Which currency should we assume all amounts to be in? 41 */ 42 char *currency; 43 44 /** 45 * Our base URL. 46 */ 47 char *donau_url; 48 49 /** 50 * Postgres connection handle. 51 */ 52 struct GNUNET_PQ_Context *conn; 53 54 /** 55 * Name of the current transaction, for debugging. 56 */ 57 const char *transaction_name; 58 59 }; 60 61 62 /** 63 * Counts how often we have established a fresh @e conn 64 * to the database. Used to re-prepare statements. 65 */ 66 extern unsigned long long DONAUDB_prep_gen_; 67 68 69 /** 70 * Prepares SQL statement @a sql under @a name for 71 * connection @a pg once. 72 * Returns with #GNUNET_DB_STATUS_HARD_ERROR on failure. 73 * 74 * @param pg a `struct DONAUDB_PostgresContext` 75 * @param name name to prepare the statement under 76 * @param sql actual SQL text 77 */ 78 #define PREPARE(pg,name,sql) \ 79 do { \ 80 static struct { \ 81 unsigned long long cnt; \ 82 struct DONAUDB_PostgresContext *pg; \ 83 } preps[2]; /* 2 ctrs for taler-auditor-sync*/ \ 84 unsigned int off = 0; \ 85 \ 86 while ( (NULL != preps[off].pg) && \ 87 (ctx != preps[off].pg) && \ 88 (off < sizeof(preps) / sizeof(*preps)) ) \ 89 off++; \ 90 GNUNET_assert (off < \ 91 sizeof(preps) / sizeof(*preps)); \ 92 if (preps[off].cnt < DONAUDB_prep_gen_) \ 93 { \ 94 struct GNUNET_PQ_PreparedStatement ps[] = { \ 95 GNUNET_PQ_make_prepare (name, sql), \ 96 GNUNET_PQ_PREPARED_STATEMENT_END \ 97 }; \ 98 \ 99 if (GNUNET_OK != \ 100 GNUNET_PQ_prepare_statements (pg->conn, \ 101 ps)) \ 102 { \ 103 GNUNET_break (0); \ 104 return GNUNET_DB_STATUS_HARD_ERROR; \ 105 } \ 106 preps[off].pg = ctx; \ 107 preps[off].cnt = DONAUDB_prep_gen_; \ 108 } \ 109 } while (0) 110 111 112 /** 113 * Wrapper macro to add the currency from the plugin's state 114 * when fetching amounts from the database. 115 * 116 * @param field name of the database field to fetch amount from 117 * @param[out] amountp pointer to amount to set 118 */ 119 #define TALER_PQ_RESULT_SPEC_AMOUNT(field, \ 120 amountp) \ 121 TALER_PQ_result_spec_amount ( \ 122 field,ctx->currency,amountp) 123 124 125 #endif