Line data Source code
1 : /*
2 : This file is part of TALER
3 : Copyright (C) 2022 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/lookup_wire_fee_by_time.c
18 : * @brief Implementation of the lookup_wire_fee_by_time function for Postgres
19 : * @author Christian Grothoff
20 : */
21 : #include "taler/taler_pq_lib.h"
22 : #include "exchange-database/lookup_wire_fee_by_time.h"
23 : #include "helper.h"
24 :
25 :
26 : /**
27 : * Closure for #wire_fee_by_time_helper()
28 : */
29 : struct WireFeeLookupContext
30 : {
31 :
32 : /**
33 : * Set to the wire fees. Set to invalid if fees conflict over
34 : * the given time period.
35 : */
36 : struct TALER_WireFeeSet *fees;
37 :
38 : /**
39 : * Plugin context.
40 : */
41 : struct TALER_EXCHANGEDB_PostgresContext *pg;
42 : };
43 :
44 :
45 : /**
46 : * Helper function for #TALER_EXCHANGEDB_lookup_wire_fee_by_time().
47 : * Calls the callback with the wire fee structure.
48 : *
49 : * @param cls a `struct WireFeeLookupContext`
50 : * @param result db results
51 : * @param num_results number of results in @a result
52 : */
53 : static void
54 42 : wire_fee_by_time_helper (void *cls,
55 : PGresult *result,
56 : unsigned int num_results)
57 : {
58 42 : struct WireFeeLookupContext *wlc = cls;
59 42 : struct TALER_EXCHANGEDB_PostgresContext *pg = wlc->pg;
60 :
61 46 : for (unsigned int i = 0; i<num_results; i++)
62 : {
63 : struct TALER_WireFeeSet fs;
64 4 : struct GNUNET_PQ_ResultSpec rs[] = {
65 4 : TALER_PQ_RESULT_SPEC_AMOUNT ("wire_fee",
66 : &fs.wire),
67 4 : TALER_PQ_RESULT_SPEC_AMOUNT ("closing_fee",
68 : &fs.closing),
69 : GNUNET_PQ_result_spec_end
70 : };
71 :
72 4 : if (GNUNET_OK !=
73 4 : GNUNET_PQ_extract_result (result,
74 : rs,
75 : i))
76 : {
77 0 : GNUNET_break (0);
78 : /* invalidate */
79 0 : memset (wlc->fees,
80 : 0,
81 : sizeof (struct TALER_WireFeeSet));
82 0 : return;
83 : }
84 4 : if (0 == i)
85 : {
86 4 : *wlc->fees = fs;
87 4 : continue;
88 : }
89 0 : if (0 !=
90 0 : TALER_wire_fee_set_cmp (&fs,
91 0 : wlc->fees))
92 : {
93 : /* invalidate */
94 0 : memset (wlc->fees,
95 : 0,
96 : sizeof (struct TALER_WireFeeSet));
97 0 : return;
98 : }
99 : }
100 : }
101 :
102 :
103 : /**
104 : * Lookup information about known wire fees. Finds all applicable
105 : * fees in the given range. If they are identical, returns the
106 : * respective @a fees. If any of the fees
107 : * differ between @a start_time and @a end_time, the transaction
108 : * succeeds BUT returns an invalid amount for both fees.
109 : *
110 : * @param pg the database context
111 : * @param wire_method the wire method to lookup fees for
112 : * @param start_time starting time of fee
113 : * @param end_time end time of fee
114 : * @param[out] fees wire fees for that time period; if
115 : * different fees exists within this time
116 : * period, an 'invalid' amount is returned.
117 : * @return transaction status code
118 : */
119 : enum GNUNET_DB_QueryStatus
120 42 : TALER_EXCHANGEDB_lookup_wire_fee_by_time (
121 : struct TALER_EXCHANGEDB_PostgresContext *pg,
122 : const char *wire_method,
123 : struct GNUNET_TIME_Timestamp start_time,
124 : struct GNUNET_TIME_Timestamp end_time,
125 : struct TALER_WireFeeSet *fees)
126 : {
127 42 : struct GNUNET_PQ_QueryParam params[] = {
128 42 : GNUNET_PQ_query_param_string (wire_method),
129 42 : GNUNET_PQ_query_param_timestamp (&start_time),
130 42 : GNUNET_PQ_query_param_timestamp (&end_time),
131 : GNUNET_PQ_query_param_end
132 : };
133 42 : struct WireFeeLookupContext wlc = {
134 : .fees = fees,
135 : .pg = pg
136 : };
137 :
138 42 : PREPARE (pg,
139 : "lookup_wire_fee_by_time",
140 : "SELECT"
141 : " wire_fee"
142 : ",closing_fee"
143 : " FROM wire_fee"
144 : " WHERE wire_method=$1"
145 : " AND end_date > $2"
146 : " AND start_date < $3;");
147 42 : return GNUNET_PQ_eval_prepared_multi_select (pg->conn,
148 : "lookup_wire_fee_by_time",
149 : params,
150 : &wire_fee_by_time_helper,
151 : &wlc);
152 : }
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