Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2025 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 src/backenddb/iterate_money_pots.c
18 : * @brief Implementation of the iterate_money_pots function for Postgres
19 : * @author Christian Grothoff
20 : */
21 : #include "platform.h"
22 : #include <taler/taler_pq_lib.h>
23 : #include "merchant-database/iterate_money_pots.h"
24 : #include "helper.h"
25 :
26 :
27 : /**
28 : * Hard upper bound on the number of records returned by a single
29 : * call, regardless of the limit requested by the client.
30 : */
31 : #define MAX_RECORDS 50000
32 :
33 :
34 : /**
35 : * Context used for TALER_MERCHANTDB_iterate_money_pots().
36 : */
37 : struct LookupMoneyPotsContext
38 : {
39 : /**
40 : * DB context.
41 : */
42 : struct TALER_MERCHANTDB_PostgresContext *pg;
43 :
44 : /**
45 : * Function to call with the results.
46 : */
47 : TALER_MERCHANTDB_MoneyPotsCallback cb;
48 :
49 : /**
50 : * Closure for @a cb.
51 : */
52 : void *cb_cls;
53 :
54 : /**
55 : * Did database result extraction fail?
56 : */
57 : bool extract_failed;
58 : };
59 :
60 :
61 : /**
62 : * Function to be called with the results of a SELECT statement
63 : * that has returned @a num_results results about money pots.
64 : *
65 : * @param[in,out] cls of type `struct LookupMoneyPotsContext *`
66 : * @param result the postgres result
67 : * @param num_results the number of results in @a result
68 : */
69 : static void
70 1 : lookup_money_pots_cb (void *cls,
71 : PGresult *result,
72 : unsigned int num_results)
73 : {
74 1 : struct LookupMoneyPotsContext *plc = cls;
75 :
76 2 : for (unsigned int i = 0; i < num_results; i++)
77 : {
78 : uint64_t money_pot_serial;
79 : char *money_pot_name;
80 : size_t pot_total_len;
81 : struct TALER_Amount *pot_totals;
82 1 : struct GNUNET_PQ_ResultSpec rs[] = {
83 1 : GNUNET_PQ_result_spec_uint64 ("money_pot_serial",
84 : &money_pot_serial),
85 1 : GNUNET_PQ_result_spec_string ("money_pot_name",
86 : &money_pot_name),
87 1 : TALER_PQ_result_spec_array_amount_with_currency (plc->pg->conn,
88 : "merchant",
89 : "pot_totals",
90 : &pot_total_len,
91 : &pot_totals),
92 : GNUNET_PQ_result_spec_end
93 : };
94 :
95 1 : if (GNUNET_OK !=
96 1 : GNUNET_PQ_extract_result (result,
97 : rs,
98 : i))
99 : {
100 0 : GNUNET_break (0);
101 0 : plc->extract_failed = true;
102 0 : return;
103 : }
104 1 : plc->cb (plc->cb_cls,
105 : money_pot_serial,
106 : money_pot_name,
107 : pot_total_len,
108 : pot_totals);
109 1 : GNUNET_PQ_cleanup_result (rs);
110 : }
111 : }
112 :
113 :
114 : enum GNUNET_DB_QueryStatus
115 1 : TALER_MERCHANTDB_iterate_money_pots (
116 : struct TALER_MERCHANTDB_PostgresContext *pg,
117 : const char *instance_id,
118 : int64_t limit,
119 : uint64_t offset,
120 : TALER_MERCHANTDB_MoneyPotsCallback cb,
121 : void *cb_cls)
122 : {
123 1 : uint64_t plimit = GNUNET_MIN ((uint64_t) MAX_RECORDS,
124 : TALER_MERCHANTDB_abs_limit (limit));
125 1 : struct LookupMoneyPotsContext plc = {
126 : .pg = pg,
127 : .cb = cb,
128 : .cb_cls = cb_cls,
129 : /* Can be overwritten by the lookup_money_pots_cb */
130 : .extract_failed = false,
131 : };
132 1 : struct GNUNET_PQ_QueryParam params[] = {
133 1 : GNUNET_PQ_query_param_uint64 (&offset),
134 1 : GNUNET_PQ_query_param_uint64 (&plimit),
135 : GNUNET_PQ_query_param_end
136 : };
137 : enum GNUNET_DB_QueryStatus qs;
138 :
139 1 : GNUNET_assert (NULL != pg->current_merchant_id);
140 1 : GNUNET_assert (0 == strcmp (instance_id,
141 : pg->current_merchant_id));
142 1 : if (limit > 0)
143 : {
144 0 : TMH_PQ_prepare_anon (pg,
145 : "SELECT"
146 : " money_pot_serial"
147 : " ,money_pot_name"
148 : " ,pot_totals"
149 : " FROM merchant_money_pots"
150 : " WHERE money_pot_serial > $1"
151 : " ORDER BY money_pot_serial ASC"
152 : " LIMIT $2");
153 : }
154 : else
155 : {
156 1 : TMH_PQ_prepare_anon (pg,
157 : "SELECT"
158 : " money_pot_serial"
159 : " ,money_pot_name"
160 : " ,pot_totals"
161 : " FROM merchant_money_pots"
162 : " WHERE money_pot_serial < $1"
163 : " ORDER BY money_pot_serial DESC"
164 : " LIMIT $2");
165 : }
166 1 : qs = GNUNET_PQ_eval_prepared_multi_select (
167 : pg->conn,
168 : "",
169 : params,
170 : &lookup_money_pots_cb,
171 : &plc);
172 : /* If there was an error inside lookup_money_pots_cb, return a hard error. */
173 1 : if (plc.extract_failed)
174 : {
175 0 : GNUNET_break (0);
176 0 : return GNUNET_DB_STATUS_HARD_ERROR;
177 : }
178 1 : return qs;
179 : }
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