Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 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 auditordb/pg_get_balance.c
18 : * @brief Implementation of the get_balance function for Postgres
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_balance.h"
26 : #include "pg_helper.h"
27 :
28 :
29 : /**
30 : * Closure for #balance_cb().
31 : */
32 : struct BalanceContext
33 : {
34 :
35 : /**
36 : * Where to store results.
37 : */
38 : struct TALER_Amount **dst;
39 :
40 : /**
41 : * Offset in @e dst.
42 : */
43 : unsigned int off;
44 :
45 : /**
46 : * Length of array at @e dst.
47 : */
48 : unsigned int len;
49 :
50 : /**
51 : * Plugin context.
52 : */
53 : struct PostgresClosure *pg;
54 :
55 : /**
56 : * Set to true on failure.
57 : */
58 : bool failure;
59 :
60 : };
61 :
62 :
63 : /**
64 : * Helper function for #TAH_PG_get_balance().
65 : * To be called with the results of a SELECT statement
66 : * that has returned @a num_results results.
67 : *
68 : * @param cls closure of type `struct BalanceContext *`
69 : * @param result the postgres result
70 : * @param num_results the number of results in @a result
71 : */
72 : static void
73 578 : balance_cb (void *cls,
74 : PGresult *result,
75 : unsigned int num_results)
76 : {
77 578 : struct BalanceContext *ctx = cls;
78 578 : struct PostgresClosure *pg = ctx->pg;
79 :
80 578 : GNUNET_assert (num_results <= ctx->len);
81 4784 : for (unsigned int i = 0; i < num_results; i++)
82 : {
83 : bool is_missing;
84 4206 : struct GNUNET_PQ_ResultSpec rs[] = {
85 4206 : GNUNET_PQ_result_spec_allow_null (
86 : TALER_PQ_result_spec_amount ("balance",
87 4206 : pg->currency,
88 4206 : ctx->dst[i]),
89 : &is_missing),
90 : GNUNET_PQ_result_spec_end
91 : };
92 :
93 4206 : if (GNUNET_OK !=
94 4206 : GNUNET_PQ_extract_result (result,
95 : rs,
96 : i))
97 : {
98 0 : GNUNET_break (0);
99 0 : ctx->failure = true;
100 0 : return;
101 : }
102 4206 : if (is_missing)
103 : {
104 2425 : GNUNET_assert (GNUNET_OK ==
105 : TALER_amount_set_zero (pg->currency,
106 : ctx->dst[i]));
107 : }
108 4206 : ctx->off++;
109 : }
110 : }
111 :
112 :
113 : enum GNUNET_DB_QueryStatus
114 578 : TAH_PG_get_balance (void *cls,
115 : const char *balance_key,
116 : struct TALER_Amount *balance_value,
117 : ...)
118 : {
119 578 : struct PostgresClosure *pg = cls;
120 578 : unsigned int cnt = 1;
121 : va_list ap;
122 :
123 578 : GNUNET_assert (GNUNET_OK ==
124 : TALER_amount_set_zero (pg->currency,
125 : balance_value));
126 578 : va_start (ap,
127 : balance_value);
128 4206 : while (NULL != va_arg (ap,
129 : const char *))
130 : {
131 : struct TALER_Amount *dst;
132 :
133 3628 : cnt++;
134 3628 : dst = va_arg (ap,
135 : struct TALER_Amount *);
136 3628 : GNUNET_assert (GNUNET_OK ==
137 : TALER_amount_set_zero (pg->currency,
138 : dst));
139 : }
140 578 : va_end (ap);
141 578 : {
142 578 : const char *keys[cnt];
143 578 : struct TALER_Amount *dsts[cnt];
144 578 : unsigned int off = 1;
145 578 : struct GNUNET_PQ_QueryParam params[] = {
146 578 : GNUNET_PQ_query_param_array_ptrs_string (cnt,
147 : keys,
148 : pg->conn),
149 : GNUNET_PQ_query_param_end
150 : };
151 578 : struct BalanceContext ctx = {
152 : .dst = dsts,
153 : .len = cnt,
154 : .pg = pg
155 : };
156 : enum GNUNET_DB_QueryStatus qs;
157 :
158 578 : keys[0] = balance_key;
159 578 : dsts[0] = balance_value;
160 578 : va_start (ap,
161 : balance_value);
162 4206 : while (off < cnt)
163 : {
164 3628 : keys[off] = va_arg (ap,
165 : const char *);
166 3628 : dsts[off] = va_arg (ap,
167 : struct TALER_Amount *);
168 3628 : off++;
169 : }
170 578 : GNUNET_assert (NULL == va_arg (ap,
171 : const char *));
172 578 : va_end (ap);
173 :
174 578 : PREPARE (pg,
175 : "get_balance",
176 : "SELECT "
177 : " auditor_do_get_balance AS balance"
178 : " FROM auditor_do_get_balance "
179 : "($1);");
180 578 : qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
181 : "get_balance",
182 : params,
183 : &balance_cb,
184 : &ctx);
185 578 : GNUNET_PQ_cleanup_query_params_closures (params);
186 578 : if (ctx.failure)
187 0 : return GNUNET_DB_STATUS_HARD_ERROR;
188 578 : if (qs < 0)
189 0 : return qs;
190 578 : GNUNET_assert (qs == ctx.off);
191 578 : return qs;
192 : }
193 : }
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