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/pg_ensure_coin_known.c
18 : * @brief Implementation of the ensure_coin_known function for Postgres
19 : * @author Christian Grothoff
20 : */
21 : #include "platform.h"
22 : #include "taler_error_codes.h"
23 : #include "taler_dbevents.h"
24 : #include "taler_exchangedb_plugin.h"
25 : #include "taler_pq_lib.h"
26 : #include "pg_ensure_coin_known.h"
27 : #include "pg_helper.h"
28 :
29 :
30 : enum TALER_EXCHANGEDB_CoinKnownStatus
31 183 : TEH_PG_ensure_coin_known (void *cls,
32 : const struct TALER_CoinPublicInfo *coin,
33 : uint64_t *known_coin_id,
34 : struct TALER_DenominationHashP *denom_hash,
35 : struct TALER_AgeCommitmentHash *h_age_commitment)
36 : {
37 183 : struct PostgresClosure *pg = cls;
38 : enum GNUNET_DB_QueryStatus qs;
39 : bool existed;
40 : bool no_denom_pub_hash;
41 : bool no_age_commitment_hash;
42 183 : struct GNUNET_PQ_QueryParam params[] = {
43 183 : GNUNET_PQ_query_param_auto_from_type (&coin->coin_pub),
44 183 : GNUNET_PQ_query_param_auto_from_type (&coin->denom_pub_hash),
45 183 : coin->no_age_commitment
46 119 : ? GNUNET_PQ_query_param_null ()
47 183 : : GNUNET_PQ_query_param_auto_from_type (&coin->h_age_commitment),
48 183 : TALER_PQ_query_param_denom_sig (&coin->denom_sig),
49 : GNUNET_PQ_query_param_end
50 : };
51 183 : struct GNUNET_PQ_ResultSpec rs[] = {
52 183 : GNUNET_PQ_result_spec_bool ("existed",
53 : &existed),
54 183 : GNUNET_PQ_result_spec_uint64 ("known_coin_id",
55 : known_coin_id),
56 183 : GNUNET_PQ_result_spec_allow_null (
57 : GNUNET_PQ_result_spec_auto_from_type ("denom_pub_hash",
58 : denom_hash),
59 : &no_denom_pub_hash),
60 183 : GNUNET_PQ_result_spec_allow_null (
61 : GNUNET_PQ_result_spec_auto_from_type ("age_commitment_hash",
62 : h_age_commitment),
63 : &no_age_commitment_hash),
64 : GNUNET_PQ_result_spec_end
65 : };
66 :
67 : /*
68 : See also:
69 : https://stackoverflow.com/questions/34708509/how-to-use-returning-with-on-conflict-in-postgresql/37543015#37543015
70 : */
71 183 : PREPARE (pg,
72 : "insert_known_coin",
73 : "WITH dd"
74 : " (denominations_serial"
75 : " ,coin"
76 : " ) AS ("
77 : " SELECT "
78 : " denominations_serial"
79 : " ,coin"
80 : " FROM denominations"
81 : " WHERE denom_pub_hash=$2"
82 : " ), input_rows"
83 : " (coin_pub) AS ("
84 : " VALUES ($1::BYTEA)"
85 : " ), ins AS ("
86 : " INSERT INTO known_coins "
87 : " (coin_pub"
88 : " ,denominations_serial"
89 : " ,age_commitment_hash"
90 : " ,denom_sig"
91 : " ,remaining"
92 : " ) SELECT "
93 : " $1"
94 : " ,denominations_serial"
95 : " ,$3"
96 : " ,$4"
97 : " ,coin"
98 : " FROM dd"
99 : " ON CONFLICT DO NOTHING" /* CONFLICT on (coin_pub) */
100 : " RETURNING "
101 : " known_coin_id"
102 : " ) "
103 : "SELECT "
104 : " FALSE AS existed"
105 : " ,known_coin_id"
106 : " ,NULL AS denom_pub_hash"
107 : " ,NULL AS age_commitment_hash"
108 : " FROM ins "
109 : "UNION ALL "
110 : "SELECT "
111 : " TRUE AS existed"
112 : " ,known_coin_id"
113 : " ,denom_pub_hash"
114 : " ,kc.age_commitment_hash"
115 : " FROM input_rows"
116 : " JOIN known_coins kc USING (coin_pub)"
117 : " JOIN denominations USING (denominations_serial)"
118 : " LIMIT 1");
119 183 : qs = GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
120 : "insert_known_coin",
121 : params,
122 : rs);
123 183 : switch (qs)
124 : {
125 0 : case GNUNET_DB_STATUS_HARD_ERROR:
126 0 : GNUNET_break (0);
127 0 : return TALER_EXCHANGEDB_CKS_HARD_FAIL;
128 0 : case GNUNET_DB_STATUS_SOFT_ERROR:
129 0 : return TALER_EXCHANGEDB_CKS_SOFT_FAIL;
130 0 : case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
131 0 : GNUNET_break (0); /* should be impossible */
132 0 : return TALER_EXCHANGEDB_CKS_HARD_FAIL;
133 183 : case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT:
134 183 : if (! existed)
135 103 : return TALER_EXCHANGEDB_CKS_ADDED;
136 80 : break; /* continued below */
137 : }
138 :
139 80 : if ( (! no_denom_pub_hash) &&
140 80 : (0 != GNUNET_memcmp (denom_hash,
141 : &coin->denom_pub_hash)) )
142 : {
143 2 : GNUNET_break_op (0);
144 2 : return TALER_EXCHANGEDB_CKS_DENOM_CONFLICT;
145 : }
146 :
147 78 : if (no_age_commitment_hash != coin->no_age_commitment)
148 : {
149 0 : if (no_age_commitment_hash)
150 : {
151 0 : GNUNET_break_op (0);
152 0 : return TALER_EXCHANGEDB_CKS_AGE_CONFLICT_EXPECTED_NULL;
153 : }
154 : else
155 : {
156 0 : GNUNET_break_op (0);
157 0 : return TALER_EXCHANGEDB_CKS_AGE_CONFLICT_EXPECTED_NON_NULL;
158 : }
159 : }
160 78 : else if ( (! no_age_commitment_hash) &&
161 24 : (0 != GNUNET_memcmp (h_age_commitment,
162 : &coin->h_age_commitment)) )
163 : {
164 0 : GNUNET_break_op (0);
165 0 : return TALER_EXCHANGEDB_CKS_AGE_CONFLICT_VALUE_DIFFERS;
166 : }
167 :
168 78 : return TALER_EXCHANGEDB_CKS_PRESENT;
169 : }
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