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/*
This file is part of TALER
Copyright (C) 2022 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file exchangedb/pg_ensure_coin_known.c
* @brief Implementation of the ensure_coin_known function for Postgres
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_error_codes.h"
#include "taler_dbevents.h"
#include "taler_exchangedb_plugin.h"
#include "taler_pq_lib.h"
#include "pg_ensure_coin_known.h"
#include "pg_helper.h"
enum TALER_EXCHANGEDB_CoinKnownStatus
TEH_PG_ensure_coin_known (void *cls,
const struct TALER_CoinPublicInfo *coin,
uint64_t *known_coin_id,
struct TALER_DenominationHashP *denom_hash,
struct TALER_AgeCommitmentHash *h_age_commitment)
{
struct PostgresClosure *pg = cls;
enum GNUNET_DB_QueryStatus qs;
bool existed;
bool is_denom_pub_hash_null = false;
bool is_age_hash_null = false;
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_auto_from_type (&coin->coin_pub),
GNUNET_PQ_query_param_auto_from_type (&coin->denom_pub_hash),
coin->no_age_commitment
? GNUNET_PQ_query_param_null ()
: GNUNET_PQ_query_param_auto_from_type (&coin->h_age_commitment),
TALER_PQ_query_param_denom_sig (&coin->denom_sig),
GNUNET_PQ_query_param_end
};
struct GNUNET_PQ_ResultSpec rs[] = {
GNUNET_PQ_result_spec_bool ("existed",
&existed),
GNUNET_PQ_result_spec_uint64 ("known_coin_id",
known_coin_id),
GNUNET_PQ_result_spec_allow_null (
GNUNET_PQ_result_spec_auto_from_type ("denom_pub_hash",
denom_hash),
&is_denom_pub_hash_null),
GNUNET_PQ_result_spec_allow_null (
GNUNET_PQ_result_spec_auto_from_type ("age_commitment_hash",
h_age_commitment),
&is_age_hash_null),
GNUNET_PQ_result_spec_end
};
/*
See also:
https://stackoverflow.com/questions/34708509/how-to-use-returning-with-on-conflict-in-postgresql/37543015#37543015
*/
PREPARE (pg,
"insert_known_coin",
"WITH dd"
" (denominations_serial"
" ,coin"
" ) AS ("
" SELECT "
" denominations_serial"
" ,coin"
" FROM denominations"
" WHERE denom_pub_hash=$2"
" ), input_rows"
" (coin_pub) AS ("
" VALUES ($1::BYTEA)"
" ), ins AS ("
" INSERT INTO known_coins "
" (coin_pub"
" ,denominations_serial"
" ,age_commitment_hash"
" ,denom_sig"
" ,remaining"
" ) SELECT "
" $1"
" ,denominations_serial"
" ,$3"
" ,$4"
" ,coin"
" FROM dd"
" ON CONFLICT DO NOTHING" /* CONFLICT on (coin_pub) */
" RETURNING "
" known_coin_id"
" ) "
"SELECT "
" FALSE AS existed"
" ,known_coin_id"
" ,NULL AS denom_pub_hash"
" ,NULL AS age_commitment_hash"
" FROM ins "
"UNION ALL "
"SELECT "
" TRUE AS existed"
" ,known_coin_id"
" ,denom_pub_hash"
" ,kc.age_commitment_hash"
" FROM input_rows"
" JOIN known_coins kc USING (coin_pub)"
" JOIN denominations USING (denominations_serial)"
" LIMIT 1");
qs = GNUNET_PQ_eval_prepared_singleton_select (pg->conn,
"insert_known_coin",
params,
rs);
switch (qs)
{
case GNUNET_DB_STATUS_HARD_ERROR:
GNUNET_break (0);
return TALER_EXCHANGEDB_CKS_HARD_FAIL;
case GNUNET_DB_STATUS_SOFT_ERROR:
return TALER_EXCHANGEDB_CKS_SOFT_FAIL;
case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
GNUNET_break (0); /* should be impossible */
return TALER_EXCHANGEDB_CKS_HARD_FAIL;
case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT:
if (! existed)
return TALER_EXCHANGEDB_CKS_ADDED;
break; /* continued below */
}
if ( (! is_denom_pub_hash_null) &&
(0 != GNUNET_memcmp (&denom_hash->hash,
&coin->denom_pub_hash.hash)) )
{
GNUNET_break_op (0);
return TALER_EXCHANGEDB_CKS_DENOM_CONFLICT;
}
if (is_age_hash_null != coin->no_age_commitment)
{
if (is_age_hash_null)
{
GNUNET_break_op (0);
return TALER_EXCHANGEDB_CKS_AGE_CONFLICT_EXPECTED_NULL;
}
else
{
GNUNET_break_op (0);
return TALER_EXCHANGEDB_CKS_AGE_CONFLICT_EXPECTED_NON_NULL;
}
}
else if ( (! is_age_hash_null) &&
(0 != GNUNET_memcmp (h_age_commitment,
&coin->h_age_commitment)) )
{
GNUNET_break_op (0);
return TALER_EXCHANGEDB_CKS_AGE_CONFLICT_VALUE_DIFFERS;
}
return TALER_EXCHANGEDB_CKS_PRESENT;
}
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