Line data Source code
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 get_expired_reserves.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 "exchange-database/get_expired_reserves.h"
23 : #include "helper.h"
24 :
25 :
26 : /**
27 : * Closure for #reserve_expired_cb().
28 : */
29 : struct ExpiredReserveContext
30 : {
31 : /**
32 : * Function to call for each expired reserve.
33 : */
34 : TALER_EXCHANGEDB_ReserveExpiredCallback rec;
35 :
36 : /**
37 : * Closure to give to @e rec.
38 : */
39 : void *rec_cls;
40 :
41 : /**
42 : * Plugin context.
43 : */
44 : struct TALER_EXCHANGEDB_PostgresContext *pg;
45 :
46 : /**
47 : * Set to #GNUNET_SYSERR on error.
48 : */
49 : enum GNUNET_GenericReturnValue status;
50 : };
51 :
52 :
53 : /**
54 : * Function to be called with the results of a SELECT statement
55 : * that has returned @a num_results results.
56 : *
57 : * @param cls closure
58 : * @param result the postgres result
59 : * @param num_results the number of results in @a result
60 : */
61 : static void
62 17 : reserve_expired_cb (void *cls,
63 : PGresult *result,
64 : unsigned int num_results)
65 : {
66 17 : struct ExpiredReserveContext *erc = cls;
67 17 : struct TALER_EXCHANGEDB_PostgresContext *pg = erc->pg;
68 17 : enum GNUNET_GenericReturnValue ret = GNUNET_OK;
69 :
70 24 : for (unsigned int i = 0; i<num_results; i++)
71 : {
72 : struct GNUNET_TIME_Timestamp exp_date;
73 : struct TALER_FullPayto account_details;
74 : struct TALER_ReservePublicKeyP reserve_pub;
75 : struct TALER_Amount remaining_balance;
76 7 : struct GNUNET_PQ_ResultSpec rs[] = {
77 7 : GNUNET_PQ_result_spec_timestamp ("expiration_date",
78 : &exp_date),
79 7 : GNUNET_PQ_result_spec_string ("account_details",
80 : &account_details.full_payto),
81 7 : GNUNET_PQ_result_spec_auto_from_type ("reserve_pub",
82 : &reserve_pub),
83 7 : TALER_PQ_result_spec_amount ("current_balance",
84 7 : pg->currency,
85 : &remaining_balance),
86 : GNUNET_PQ_result_spec_end
87 : };
88 :
89 7 : if (GNUNET_OK !=
90 7 : GNUNET_PQ_extract_result (result,
91 : rs,
92 : i))
93 : {
94 0 : GNUNET_break (0);
95 0 : ret = GNUNET_SYSERR;
96 0 : break;
97 : }
98 7 : ret = erc->rec (erc->rec_cls,
99 : &reserve_pub,
100 : &remaining_balance,
101 : account_details,
102 : exp_date,
103 : 0);
104 7 : GNUNET_PQ_cleanup_result (rs);
105 7 : if (GNUNET_OK != ret)
106 0 : break;
107 : }
108 17 : erc->status = ret;
109 17 : }
110 :
111 :
112 : enum GNUNET_DB_QueryStatus
113 17 : TALER_EXCHANGEDB_get_expired_reserves (
114 : struct TALER_EXCHANGEDB_PostgresContext *pg,
115 : struct GNUNET_TIME_Timestamp now,
116 : TALER_EXCHANGEDB_ReserveExpiredCallback rec,
117 : void *rec_cls)
118 : {
119 17 : struct GNUNET_PQ_QueryParam params[] = {
120 17 : GNUNET_PQ_query_param_timestamp (&now),
121 : GNUNET_PQ_query_param_end
122 : };
123 17 : struct ExpiredReserveContext ectx = {
124 : .rec = rec,
125 : .rec_cls = rec_cls,
126 : .pg = pg,
127 : .status = GNUNET_OK
128 : };
129 : enum GNUNET_DB_QueryStatus qs;
130 :
131 17 : PREPARE (pg,
132 : "get_expired_reserves",
133 : "WITH ed AS MATERIALIZED ( "
134 : " SELECT expiration_date"
135 : " ,wire_source_h_payto"
136 : " ,current_balance"
137 : " ,r.reserve_pub"
138 : " FROM reserves r"
139 : " JOIN reserves_in"
140 : " USING (reserve_pub)"
141 : " WHERE expiration_date <= $1 "
142 : " AND ((current_balance).val != 0 OR (current_balance).frac != 0) "
143 : " ORDER BY expiration_date ASC "
144 : " LIMIT 1 "
145 : ") "
146 : "SELECT"
147 : " wt.payto_uri AS account_details"
148 : " ,ed.expiration_date"
149 : " ,ed.reserve_pub"
150 : " ,ed.current_balance"
151 : " FROM wire_targets wt"
152 : " JOIN ed"
153 : " ON (ed.wire_source_h_payto=wt.wire_target_h_payto);");
154 17 : qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
155 : "get_expired_reserves",
156 : params,
157 : &reserve_expired_cb,
158 : &ectx);
159 17 : switch (ectx.status)
160 : {
161 0 : case GNUNET_SYSERR:
162 0 : return GNUNET_DB_STATUS_HARD_ERROR;
163 0 : case GNUNET_NO:
164 0 : return GNUNET_DB_STATUS_SOFT_ERROR;
165 17 : case GNUNET_OK:
166 17 : break;
167 : }
168 17 : return qs;
169 : }
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