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 exchangedb/iterate_exchange_credit_transfers.c
18 : * @brief Implementation of the iterate_exchange_credit_transfers function for Postgres
19 : * @author Christian Grothoff
20 : */
21 : #include "taler/taler_pq_lib.h"
22 : #include "exchange-database/iterate_exchange_credit_transfers.h"
23 : #include "helper.h"
24 :
25 :
26 : /**
27 : * Hard upper bound on the number of records returned by a single
28 : * call, regardless of the limit requested by the client.
29 : */
30 : #define MAX_RECORDS 50000
31 :
32 :
33 : /**
34 : * Closure for #handle_aml_result.
35 : */
36 : struct SelectTransferContext
37 : {
38 : /**
39 : * Function to call on each result.
40 : */
41 : TALER_EXCHANGEDB_AmlTransferCallback cb;
42 :
43 : /**
44 : * Closure for @e cb.
45 : */
46 : void *cb_cls;
47 :
48 : /**
49 : * Plugin context.
50 : */
51 : struct TALER_EXCHANGEDB_PostgresContext *pg;
52 :
53 : /**
54 : * Set to #GNUNET_SYSERR on serious errors.
55 : */
56 : enum GNUNET_GenericReturnValue status;
57 : };
58 :
59 :
60 : /**
61 : * Function to be called with the results of a SELECT statement
62 : * that has returned @a num_results results. Helper function
63 : * for #TALER_EXCHANGEDB_iterate_exchange_debit_transfers().
64 : *
65 : * @param cls closure of type `struct SelectTransferContext *`
66 : * @param result the postgres result
67 : * @param num_results the number of results in @a result
68 : */
69 : static void
70 7 : handle_transfer_result (void *cls,
71 : PGresult *result,
72 : unsigned int num_results)
73 : {
74 7 : struct SelectTransferContext *stc = cls;
75 7 : struct TALER_EXCHANGEDB_PostgresContext *pg = stc->pg;
76 :
77 18 : for (unsigned int i = 0; i<num_results; i++)
78 : {
79 : char *payto_uri;
80 : uint64_t rowid;
81 : struct GNUNET_TIME_Absolute execution_time;
82 : struct TALER_Amount amount;
83 11 : struct GNUNET_PQ_ResultSpec rs[] = {
84 11 : GNUNET_PQ_result_spec_uint64 ("serial_id",
85 : &rowid),
86 11 : GNUNET_PQ_result_spec_string ("payto_uri",
87 : &payto_uri),
88 11 : GNUNET_PQ_result_spec_absolute_time ("execution_time",
89 : &execution_time),
90 11 : TALER_PQ_RESULT_SPEC_AMOUNT ("amount",
91 : &amount),
92 : GNUNET_PQ_result_spec_end
93 : };
94 :
95 11 : if (GNUNET_OK !=
96 11 : GNUNET_PQ_extract_result (result,
97 : rs,
98 : i))
99 : {
100 0 : GNUNET_break (0);
101 0 : stc->status = GNUNET_SYSERR;
102 0 : return;
103 : }
104 11 : stc->cb (stc->cb_cls,
105 : rowid,
106 : payto_uri,
107 : execution_time,
108 : &amount);
109 11 : GNUNET_PQ_cleanup_result (rs);
110 : }
111 : }
112 :
113 :
114 : enum GNUNET_DB_QueryStatus
115 7 : TALER_EXCHANGEDB_iterate_exchange_credit_transfers (
116 : struct TALER_EXCHANGEDB_PostgresContext *pg,
117 : const struct TALER_Amount *threshold,
118 : uint64_t offset,
119 : int64_t limit,
120 : const struct TALER_NormalizedPaytoHashP *h_payto,
121 : TALER_EXCHANGEDB_AmlTransferCallback cb,
122 : void *cb_cls)
123 : {
124 7 : struct SelectTransferContext stc = {
125 : .pg = pg,
126 : .cb = cb,
127 : .cb_cls = cb_cls,
128 : .status = GNUNET_OK
129 : };
130 7 : uint64_t ulimit = GNUNET_MIN ((uint64_t) MAX_RECORDS,
131 : TALER_EXCHANGEDB_abs_limit (limit));
132 7 : struct GNUNET_PQ_QueryParam params[] = {
133 7 : GNUNET_PQ_query_param_uint64 (&offset),
134 7 : GNUNET_PQ_query_param_uint64 (&ulimit),
135 7 : TALER_PQ_query_param_amount (pg->conn,
136 : threshold),
137 : NULL != h_payto
138 1 : ? GNUNET_PQ_query_param_auto_from_type (h_payto)
139 7 : : GNUNET_PQ_query_param_null (),
140 : GNUNET_PQ_query_param_end
141 : };
142 : enum GNUNET_DB_QueryStatus qs;
143 :
144 7 : PREPARE (pg,
145 : "iterate_exchange_credit_transfers_inc",
146 : "SELECT"
147 : " ri.reserve_in_serial_id AS serial_id"
148 : ",wt.payto_uri"
149 : ",ri.execution_date AS execution_time"
150 : ",ri.credit AS amount"
151 : " FROM reserves_in ri"
152 : " LEFT JOIN wire_targets wt"
153 : " ON (ri.wire_source_h_payto = wt.wire_target_h_payto)"
154 : " WHERE (ri.reserve_in_serial_id > $1)"
155 : " AND ( ($4::BYTEA IS NULL) OR (wt.h_normalized_payto=$4) )"
156 : " AND ( ( (ri.credit).val > ($3::taler_amount).val)"
157 : " OR ( ( (ri.credit).val >= ($3::taler_amount).val)"
158 : " AND ( (ri.credit).frac >= ($3::taler_amount).frac) ) )"
159 : " ORDER BY ri.reserve_in_serial_id ASC"
160 : " LIMIT $2");
161 7 : PREPARE (pg,
162 : "iterate_exchange_credit_transfers_dec",
163 : "SELECT"
164 : " ri.reserve_in_serial_id AS serial_id"
165 : ",wt.payto_uri"
166 : ",ri.execution_date AS execution_time"
167 : ",ri.credit AS amount"
168 : " FROM reserves_in ri"
169 : " LEFT JOIN wire_targets wt"
170 : " ON (ri.wire_source_h_payto = wt.wire_target_h_payto)"
171 : " WHERE (ri.reserve_in_serial_id < $1)"
172 : " AND ( ($4::BYTEA IS NULL) OR (wt.h_normalized_payto=$4) )"
173 : " AND ( ( (ri.credit).val > ($3::taler_amount).val)"
174 : " OR ( ( (ri.credit).val >= ($3::taler_amount).val)"
175 : " AND ( (ri.credit).frac >= ($3::taler_amount).frac) ) )"
176 : " ORDER BY ri.reserve_in_serial_id DESC"
177 : " LIMIT $2");
178 7 : qs = GNUNET_PQ_eval_prepared_multi_select (
179 : pg->conn,
180 : (limit > 0)
181 : ? "iterate_exchange_credit_transfers_inc"
182 : : "iterate_exchange_credit_transfers_dec",
183 : params,
184 : &handle_transfer_result,
185 : &stc);
186 7 : if (GNUNET_OK != stc.status)
187 0 : return GNUNET_DB_STATUS_HARD_ERROR;
188 7 : return qs;
189 : }
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