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 pg_get_expired_reserves.c
18 : * @brief Low-level (statement-level) Postgres database access for the exchange
19 : * @author Christian Grothoff
20 : */
21 : #include "taler/platform.h"
22 : #include "taler/taler_error_codes.h"
23 : #include "taler/taler_dbevents.h"
24 : #include "taler/taler_pq_lib.h"
25 : #include "pg_get_expired_reserves.h"
26 : #include "pg_helper.h"
27 :
28 :
29 : /**
30 : * Closure for #reserve_expired_cb().
31 : */
32 : struct ExpiredReserveContext
33 : {
34 : /**
35 : * Function to call for each expired reserve.
36 : */
37 : TALER_EXCHANGEDB_ReserveExpiredCallback rec;
38 :
39 : /**
40 : * Closure to give to @e rec.
41 : */
42 : void *rec_cls;
43 :
44 : /**
45 : * Plugin context.
46 : */
47 : struct PostgresClosure *pg;
48 :
49 : /**
50 : * Set to #GNUNET_SYSERR on error.
51 : */
52 : enum GNUNET_GenericReturnValue status;
53 : };
54 :
55 :
56 : /**
57 : * Function to be called with the results of a SELECT statement
58 : * that has returned @a num_results results.
59 : *
60 : * @param cls closure
61 : * @param result the postgres result
62 : * @param num_results the number of results in @a result
63 : */
64 : static void
65 31 : reserve_expired_cb (void *cls,
66 : PGresult *result,
67 : unsigned int num_results)
68 : {
69 31 : struct ExpiredReserveContext *erc = cls;
70 31 : struct PostgresClosure *pg = erc->pg;
71 31 : enum GNUNET_GenericReturnValue ret = GNUNET_OK;
72 :
73 40 : for (unsigned int i = 0; i<num_results; i++)
74 : {
75 : struct GNUNET_TIME_Timestamp exp_date;
76 : struct TALER_FullPayto account_details;
77 : struct TALER_ReservePublicKeyP reserve_pub;
78 : struct TALER_Amount remaining_balance;
79 9 : struct GNUNET_PQ_ResultSpec rs[] = {
80 9 : GNUNET_PQ_result_spec_timestamp ("expiration_date",
81 : &exp_date),
82 9 : GNUNET_PQ_result_spec_string ("account_details",
83 : &account_details.full_payto),
84 9 : GNUNET_PQ_result_spec_auto_from_type ("reserve_pub",
85 : &reserve_pub),
86 9 : TALER_PQ_result_spec_amount ("current_balance",
87 9 : pg->currency,
88 : &remaining_balance),
89 : GNUNET_PQ_result_spec_end
90 : };
91 :
92 9 : if (GNUNET_OK !=
93 9 : GNUNET_PQ_extract_result (result,
94 : rs,
95 : i))
96 : {
97 0 : GNUNET_break (0);
98 0 : ret = GNUNET_SYSERR;
99 0 : break;
100 : }
101 9 : ret = erc->rec (erc->rec_cls,
102 : &reserve_pub,
103 : &remaining_balance,
104 : account_details,
105 : exp_date,
106 : 0);
107 9 : GNUNET_PQ_cleanup_result (rs);
108 9 : if (GNUNET_OK != ret)
109 0 : break;
110 : }
111 31 : erc->status = ret;
112 31 : }
113 :
114 :
115 : enum GNUNET_DB_QueryStatus
116 31 : TEH_PG_get_expired_reserves (
117 : void *cls,
118 : struct GNUNET_TIME_Timestamp now,
119 : TALER_EXCHANGEDB_ReserveExpiredCallback rec,
120 : void *rec_cls)
121 : {
122 31 : struct PostgresClosure *pg = cls;
123 31 : struct GNUNET_PQ_QueryParam params[] = {
124 31 : GNUNET_PQ_query_param_timestamp (&now),
125 : GNUNET_PQ_query_param_end
126 : };
127 31 : struct ExpiredReserveContext ectx = {
128 : .rec = rec,
129 : .rec_cls = rec_cls,
130 : .pg = pg,
131 : .status = GNUNET_OK
132 : };
133 : enum GNUNET_DB_QueryStatus qs;
134 :
135 31 : PREPARE (pg,
136 : "get_expired_reserves",
137 : "WITH ed AS MATERIALIZED ( "
138 : " SELECT expiration_date"
139 : " ,wire_source_h_payto"
140 : " ,current_balance"
141 : " ,r.reserve_pub"
142 : " FROM reserves r"
143 : " JOIN reserves_in"
144 : " USING (reserve_pub)"
145 : " WHERE expiration_date <= $1 "
146 : " AND ((current_balance).val != 0 OR (current_balance).frac != 0) "
147 : " ORDER BY expiration_date ASC "
148 : " LIMIT 1 "
149 : ") "
150 : "SELECT"
151 : " wt.payto_uri AS account_details"
152 : " ,ed.expiration_date"
153 : " ,ed.reserve_pub"
154 : " ,ed.current_balance"
155 : " FROM wire_targets wt"
156 : " JOIN ed"
157 : " ON (ed.wire_source_h_payto=wt.wire_target_h_payto);");
158 31 : qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
159 : "get_expired_reserves",
160 : params,
161 : &reserve_expired_cb,
162 : &ectx);
163 31 : switch (ectx.status)
164 : {
165 0 : case GNUNET_SYSERR:
166 0 : return GNUNET_DB_STATUS_HARD_ERROR;
167 0 : case GNUNET_NO:
168 0 : return GNUNET_DB_STATUS_SOFT_ERROR;
169 31 : case GNUNET_OK:
170 31 : break;
171 : }
172 31 : return qs;
173 : }
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