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