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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_get_link_data.c
* @brief Implementation of the get_link_data function for Postgres
* @author Christian Grothoff
*/
#include "platform.h"
#include "taler_error_codes.h"
#include "taler_dbevents.h"
#include "taler_pq_lib.h"
#include "pg_get_link_data.h"
#include "pg_helper.h"
/**
* Closure for #add_ldl().
*/
struct LinkDataContext
{
/**
* Function to call on each result.
*/
TALER_EXCHANGEDB_LinkCallback ldc;
/**
* Closure for @e ldc.
*/
void *ldc_cls;
/**
* Last transfer public key for which we have information in @e last.
* Only valid if @e last is non-NULL.
*/
struct TALER_TransferPublicKeyP transfer_pub;
/**
* Link data for @e transfer_pub
*/
struct TALER_EXCHANGEDB_LinkList *last;
/**
* Status, set to #GNUNET_SYSERR on errors,
*/
int status;
};
/**
* Free memory of the link data list.
*
* @param cls the @e cls of this struct with the plugin-specific state (unused)
* @param ldl link data list to release
*/
static void
free_link_data_list (void *cls,
struct TALER_EXCHANGEDB_LinkList *ldl)
{
struct TALER_EXCHANGEDB_LinkList *next;
(void) cls;
while (NULL != ldl)
{
next = ldl->next;
TALER_denom_pub_free (&ldl->denom_pub);
TALER_blinded_denom_sig_free (&ldl->ev_sig);
GNUNET_free (ldl);
ldl = next;
}
}
/**
* Function to be called with the results of a SELECT statement
* that has returned @a num_results results.
*
* @param cls closure of type `struct LinkDataContext *`
* @param result the postgres result
* @param num_results the number of results in @a result
*/
static void
add_ldl (void *cls,
PGresult *result,
unsigned int num_results)
{
struct LinkDataContext *ldctx = cls;
for (int i = num_results - 1; i >= 0; i--)
{
struct TALER_EXCHANGEDB_LinkList *pos;
struct TALER_TransferPublicKeyP transfer_pub;
pos = GNUNET_new (struct TALER_EXCHANGEDB_LinkList);
{
struct TALER_BlindedPlanchet bp;
struct GNUNET_PQ_ResultSpec rs[] = {
GNUNET_PQ_result_spec_auto_from_type ("transfer_pub",
&transfer_pub),
GNUNET_PQ_result_spec_auto_from_type ("link_sig",
&pos->orig_coin_link_sig),
TALER_PQ_result_spec_blinded_denom_sig ("ev_sig",
&pos->ev_sig),
GNUNET_PQ_result_spec_uint32 ("freshcoin_index",
&pos->coin_refresh_offset),
TALER_PQ_result_spec_exchange_withdraw_values ("ewv",
&pos->alg_values),
TALER_PQ_result_spec_denom_pub ("denom_pub",
&pos->denom_pub),
TALER_PQ_result_spec_blinded_planchet ("coin_ev",
&bp),
GNUNET_PQ_result_spec_end
};
if (GNUNET_OK !=
GNUNET_PQ_extract_result (result,
rs,
i))
{
GNUNET_break (0);
GNUNET_free (pos);
ldctx->status = GNUNET_SYSERR;
return;
}
if (TALER_DENOMINATION_CS == bp.cipher)
{
pos->nonce = bp.details.cs_blinded_planchet.nonce;
pos->have_nonce = true;
}
TALER_blinded_planchet_free (&bp);
}
if ( (NULL != ldctx->last) &&
(0 == GNUNET_memcmp (&transfer_pub,
&ldctx->transfer_pub)) )
{
pos->next = ldctx->last;
}
else
{
if (NULL != ldctx->last)
{
ldctx->ldc (ldctx->ldc_cls,
&ldctx->transfer_pub,
ldctx->last);
free_link_data_list (cls,
ldctx->last);
}
ldctx->transfer_pub = transfer_pub;
}
ldctx->last = pos;
}
}
enum GNUNET_DB_QueryStatus
TEH_PG_get_link_data (void *cls,
const struct TALER_CoinSpendPublicKeyP *coin_pub,
TALER_EXCHANGEDB_LinkCallback ldc,
void *ldc_cls)
{
struct PostgresClosure *pg = cls;
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_auto_from_type (coin_pub),
GNUNET_PQ_query_param_end
};
enum GNUNET_DB_QueryStatus qs;
struct LinkDataContext ldctx;
PREPARE (pg,
"get_link",
"SELECT "
" tp.transfer_pub"
",denoms.denom_pub"
",rrc.ev_sig"
",rrc.ewv"
",rrc.link_sig"
",rrc.freshcoin_index"
",rrc.coin_ev"
" FROM refresh_commitments"
" JOIN refresh_revealed_coins rrc"
" USING (melt_serial_id)"
" JOIN refresh_transfer_keys tp"
" USING (melt_serial_id)"
" JOIN denominations denoms"
" ON (rrc.denominations_serial = denoms.denominations_serial)"
" WHERE old_coin_pub=$1"
" ORDER BY tp.transfer_pub, rrc.freshcoin_index ASC");
ldctx.ldc = ldc;
ldctx.ldc_cls = ldc_cls;
ldctx.last = NULL;
ldctx.status = GNUNET_OK;
qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
"get_link",
params,
&add_ldl,
&ldctx);
if (NULL != ldctx.last)
{
if (GNUNET_OK == ldctx.status)
{
/* call callback one more time! */
ldc (ldc_cls,
&ldctx.transfer_pub,
ldctx.last);
}
free_link_data_list (cls,
ldctx.last);
ldctx.last = NULL;
}
if (GNUNET_OK != ldctx.status)
return GNUNET_DB_STATUS_HARD_ERROR;
return qs;
}
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