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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_refresh_reveal.c
* @brief Implementation of the get_refresh_reveal 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_refresh_reveal.h"
#include "pg_helper.h"
/**
* Context where we aggregate data from the database.
* Closure for #add_revealed_coins().
*/
struct GetRevealContext
{
/**
* Array of revealed coins we obtained from the DB.
*/
struct TALER_EXCHANGEDB_RefreshRevealedCoin *rrcs;
/**
* Length of the @a rrcs array.
*/
unsigned int rrcs_len;
/**
* Set to an error code if we ran into trouble.
*/
enum GNUNET_DB_QueryStatus qs;
};
/**
* Function to be called with the results of a SELECT statement
* that has returned @a num_results results.
*
* @param cls closure of type `struct GetRevealContext`
* @param result the postgres result
* @param num_results the number of results in @a result
*/
static void
add_revealed_coins (void *cls,
PGresult *result,
unsigned int num_results)
{
struct GetRevealContext *grctx = cls;
if (0 == num_results)
return;
grctx->rrcs = GNUNET_new_array (num_results,
struct TALER_EXCHANGEDB_RefreshRevealedCoin);
grctx->rrcs_len = num_results;
for (unsigned int i = 0; i < num_results; i++)
{
uint32_t off;
struct GNUNET_PQ_ResultSpec rso[] = {
GNUNET_PQ_result_spec_uint32 ("freshcoin_index",
&off),
GNUNET_PQ_result_spec_end
};
if (GNUNET_OK !=
GNUNET_PQ_extract_result (result,
rso,
i))
{
GNUNET_break (0);
grctx->qs = GNUNET_DB_STATUS_HARD_ERROR;
return;
}
if (off >= num_results)
{
GNUNET_break (0);
grctx->qs = GNUNET_DB_STATUS_HARD_ERROR;
return;
}
{
struct TALER_EXCHANGEDB_RefreshRevealedCoin *rrc = &grctx->rrcs[off];
struct GNUNET_PQ_ResultSpec rsi[] = {
/* NOTE: freshcoin_index selected and discarded here... */
GNUNET_PQ_result_spec_auto_from_type ("denom_pub_hash",
&rrc->h_denom_pub),
GNUNET_PQ_result_spec_auto_from_type ("link_sig",
&rrc->orig_coin_link_sig),
GNUNET_PQ_result_spec_auto_from_type ("h_coin_ev",
&rrc->coin_envelope_hash),
TALER_PQ_result_spec_blinded_planchet ("coin_ev",
&rrc->blinded_planchet),
TALER_PQ_result_spec_exchange_withdraw_values ("ewv",
&rrc->exchange_vals),
TALER_PQ_result_spec_blinded_denom_sig ("ev_sig",
&rrc->coin_sig),
GNUNET_PQ_result_spec_end
};
if (NULL !=
rrc->blinded_planchet.blinded_message)
{
/* duplicate offset, not allowed */
GNUNET_break (0);
grctx->qs = GNUNET_DB_STATUS_HARD_ERROR;
return;
}
if (GNUNET_OK !=
GNUNET_PQ_extract_result (result,
rsi,
i))
{
GNUNET_break (0);
grctx->qs = GNUNET_DB_STATUS_HARD_ERROR;
return;
}
}
}
}
enum GNUNET_DB_QueryStatus
TEH_PG_get_refresh_reveal (void *cls,
const struct TALER_RefreshCommitmentP *rc,
TALER_EXCHANGEDB_RefreshCallback cb,
void *cb_cls)
{
struct PostgresClosure *pg = cls;
struct GetRevealContext grctx;
enum GNUNET_DB_QueryStatus qs;
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_auto_from_type (rc),
GNUNET_PQ_query_param_end
};
memset (&grctx,
0,
sizeof (grctx));
/* Obtain information about the coins created in a refresh
operation, used in #postgres_get_refresh_reveal() */
PREPARE (pg,
"get_refresh_revealed_coins",
"SELECT "
" rrc.freshcoin_index"
",denom.denom_pub_hash"
",rrc.h_coin_ev"
",rrc.link_sig"
",rrc.coin_ev"
",rrc.ewv"
",rrc.ev_sig"
" FROM refresh_commitments"
" JOIN refresh_revealed_coins rrc"
" USING (melt_serial_id)"
" JOIN denominations denom "
" USING (denominations_serial)"
" WHERE rc=$1;");
qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
"get_refresh_revealed_coins",
params,
&add_revealed_coins,
&grctx);
switch (qs)
{
case GNUNET_DB_STATUS_HARD_ERROR:
case GNUNET_DB_STATUS_SOFT_ERROR:
case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
goto cleanup;
case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT:
default: /* can have more than one result */
break;
}
switch (grctx.qs)
{
case GNUNET_DB_STATUS_HARD_ERROR:
case GNUNET_DB_STATUS_SOFT_ERROR:
goto cleanup;
case GNUNET_DB_STATUS_SUCCESS_NO_RESULTS:
case GNUNET_DB_STATUS_SUCCESS_ONE_RESULT: /* should be impossible */
break;
}
/* Pass result back to application */
cb (cb_cls,
grctx.rrcs_len,
grctx.rrcs);
cleanup:
for (unsigned int i = 0; i < grctx.rrcs_len; i++)
{
struct TALER_EXCHANGEDB_RefreshRevealedCoin *rrc = &grctx.rrcs[i];
TALER_blinded_denom_sig_free (&rrc->coin_sig);
TALER_blinded_planchet_free (&rrc->blinded_planchet);
TALER_denom_ewv_free (&rrc->exchange_vals);
}
GNUNET_free (grctx.rrcs);
return qs;
}
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