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 iterate_unfinished_close_requests.c
18 : * @brief Low-level (statement-level) Postgres database access for the exchange
19 : * @author Christian Grothoff
20 : */
21 : #include "taler/taler_pq_lib.h"
22 : #include "exchange-database/iterate_unfinished_close_requests.h"
23 : #include "helper.h"
24 :
25 :
26 : /**
27 : * Closure for #reserve_close_cb().
28 : */
29 : struct CloseReserveContext
30 : {
31 : /**
32 : * Function to call for each to be closed reserve.
33 : */
34 : TALER_EXCHANGEDB_ReserveExpiredCallback rec;
35 :
36 : /**
37 : * Closure to give to @e rec.
38 : */
39 : void *rec_cls;
40 :
41 : /**
42 : * Plugin context.
43 : */
44 : struct TALER_EXCHANGEDB_PostgresContext *pg;
45 :
46 : /**
47 : * Set to #GNUNET_SYSERR on error.
48 : */
49 : enum GNUNET_GenericReturnValue status;
50 : };
51 :
52 :
53 : /**
54 : * Function to be called with the results of a SELECT statement
55 : * that has returned @a num_results results.
56 : *
57 : * @param cls closure
58 : * @param result the postgres result
59 : * @param num_results the number of results in @a result
60 : */
61 : static void
62 23 : reserve_cb (void *cls,
63 : PGresult *result,
64 : unsigned int num_results)
65 : {
66 23 : struct CloseReserveContext *erc = cls;
67 23 : struct TALER_EXCHANGEDB_PostgresContext *pg = erc->pg;
68 23 : enum GNUNET_GenericReturnValue ret = GNUNET_OK;
69 :
70 28 : for (unsigned int i = 0; i<num_results; i++)
71 : {
72 : struct GNUNET_TIME_Timestamp exp_date;
73 : struct TALER_FullPayto account_details;
74 : struct TALER_ReservePublicKeyP reserve_pub;
75 : struct TALER_Amount remaining_balance;
76 : uint64_t close_request_row;
77 5 : struct GNUNET_PQ_ResultSpec rs[] = {
78 5 : GNUNET_PQ_result_spec_timestamp ("expiration_date",
79 : &exp_date),
80 5 : GNUNET_PQ_result_spec_allow_null (
81 : GNUNET_PQ_result_spec_string ("account_details",
82 : &account_details.full_payto),
83 : NULL),
84 5 : GNUNET_PQ_result_spec_auto_from_type ("reserve_pub",
85 : &reserve_pub),
86 5 : TALER_PQ_RESULT_SPEC_AMOUNT ("close",
87 : &remaining_balance),
88 5 : GNUNET_PQ_result_spec_uint64 ("close_request_serial_id",
89 : &close_request_row),
90 : GNUNET_PQ_result_spec_end
91 : };
92 :
93 : /* If neither the close request nor the reserve identifies a bank
94 : account, the callback is given a NULL payto URI. */
95 5 : account_details.full_payto = NULL;
96 5 : if (GNUNET_OK !=
97 5 : GNUNET_PQ_extract_result (result,
98 : rs,
99 : i))
100 : {
101 0 : GNUNET_break (0);
102 0 : ret = GNUNET_SYSERR;
103 0 : break;
104 : }
105 5 : ret = erc->rec (erc->rec_cls,
106 : &reserve_pub,
107 : &remaining_balance,
108 : account_details,
109 : exp_date,
110 : close_request_row);
111 5 : GNUNET_PQ_cleanup_result (rs);
112 5 : if (GNUNET_OK != ret)
113 0 : break;
114 : }
115 23 : erc->status = ret;
116 23 : }
117 :
118 :
119 : enum GNUNET_DB_QueryStatus
120 23 : TALER_EXCHANGEDB_iterate_unfinished_close_requests (
121 : struct TALER_EXCHANGEDB_PostgresContext *pg,
122 : TALER_EXCHANGEDB_ReserveExpiredCallback rec,
123 : void *rec_cls)
124 : {
125 23 : struct GNUNET_PQ_QueryParam params[] = {
126 : GNUNET_PQ_query_param_end
127 : };
128 23 : struct CloseReserveContext ectx = {
129 : .rec = rec,
130 : .rec_cls = rec_cls,
131 : .pg = pg,
132 : .status = GNUNET_OK
133 : };
134 : enum GNUNET_DB_QueryStatus qs;
135 :
136 23 : PREPARE (pg,
137 : "iterate_unfinished_close_requests",
138 : "UPDATE close_requests AS rc"
139 : " SET done=TRUE"
140 : " WHERE NOT done"
141 : " RETURNING"
142 : " reserve_pub"
143 : " ,close_request_serial_id"
144 : " ,close_timestamp AS expiration_date"
145 : " ,close"
146 : /* The account designated by the client (and covered by the KYC
147 : check done at the time of the request) takes precedence over
148 : the account the reserve was funded from. */
149 : " ,COALESCE(rc.payto_uri"
150 : " ,(SELECT payto_uri"
151 : " FROM reserves_in ri"
152 : " JOIN wire_targets wt"
153 : " ON (ri.wire_source_h_payto = wt.wire_target_h_payto)"
154 : " WHERE ri.reserve_pub=rc.reserve_pub))"
155 : " AS account_details;");
156 23 : qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
157 : "iterate_unfinished_close_requests",
158 : params,
159 : &reserve_cb,
160 : &ectx);
161 23 : switch (ectx.status)
162 : {
163 0 : case GNUNET_SYSERR:
164 0 : return GNUNET_DB_STATUS_HARD_ERROR;
165 0 : case GNUNET_NO:
166 0 : return GNUNET_DB_STATUS_SOFT_ERROR;
167 23 : case GNUNET_OK:
168 23 : break;
169 : }
170 23 : return qs;
171 : }
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