diff options
Diffstat (limited to 'src/exchangedb/pg_get_link_data.c')
-rw-r--r-- | src/exchangedb/pg_get_link_data.c | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/src/exchangedb/pg_get_link_data.c b/src/exchangedb/pg_get_link_data.c new file mode 100644 index 000000000..1b0cb3e20 --- /dev/null +++ b/src/exchangedb/pg_get_link_data.c @@ -0,0 +1,367 @@ +/* + 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; + + /** + * Status, set to #GNUNET_SYSERR on errors, + */ + enum GNUNET_GenericReturnValue status; +}; + + +/** + * Free memory of the link data list. + * + * @param ldl link data list to release + */ +static void +free_link_data_list (struct TALER_EXCHANGEDB_LinkList *ldl) +{ + struct TALER_EXCHANGEDB_LinkList *next; + + while (NULL != ldl) + { + next = ldl->next; + TALER_denom_pub_free (&ldl->denom_pub); + TALER_blinded_denom_sig_free (&ldl->ev_sig); + TALER_denom_ewv_free (&ldl->alg_values); + GNUNET_free (ldl); + ldl = next; + } +} + + +struct Results +{ + struct TALER_EXCHANGEDB_LinkList *pos; + struct TALER_TransferPublicKeyP transfer_pub; +}; + + +static int +transfer_pub_cmp (const void *a, + const void *b) +{ + const struct Results *ra = a; + const struct Results *rb = b; + + return GNUNET_memcmp (&ra->transfer_pub, + &rb->transfer_pub); +} + + +/** + * 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; + struct Results *temp = GNUNET_new_array (num_results, + struct Results); + unsigned int temp_off = 0; + + for (int i = num_results - 1; i >= 0; i--) + { + struct TALER_EXCHANGEDB_LinkList *pos; + + 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", + &temp[temp_off].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 (GNUNET_CRYPTO_BSA_CS == bp.blinded_message->cipher) + { + pos->nonce.cs_nonce + = bp.blinded_message->details.cs_blinded_message.nonce; + pos->have_nonce = true; + } + TALER_blinded_planchet_free (&bp); + } + temp[temp_off].pos = pos; + temp_off++; + } + qsort (temp, + temp_off, + sizeof (struct Results), + &transfer_pub_cmp); + if (temp_off > 0) + { + struct TALER_EXCHANGEDB_LinkList *head = NULL; + + head = temp[0].pos; + for (unsigned int i = 1; i < temp_off; i++) + { + struct TALER_EXCHANGEDB_LinkList *pos = temp[i].pos; + const struct TALER_TransferPublicKeyP *tp = &temp[i].transfer_pub; + + if (0 == GNUNET_memcmp (tp, + &temp[i - 1].transfer_pub)) + { + pos->next = head; + head = pos; + } + else + { + ldctx->ldc (ldctx->ldc_cls, + &temp[i - 1].transfer_pub, + head); + free_link_data_list (head); + head = pos; + } + } + ldctx->ldc (ldctx->ldc_cls, + &temp[temp_off - 1].transfer_pub, + head); + free_link_data_list (head); + } + GNUNET_free (temp); +} + + +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; + static int percent_refund = -2; + const char *query; + + if (-2 == percent_refund) + { + const char *mode = getenv ("TALER_POSTGRES_GET_LINK_DATA_LOGIC"); + char dummy; + + if ( (NULL==mode) || + (1 != sscanf (mode, + "%d%c", + &percent_refund, + &dummy)) ) + { + if (NULL != mode) + GNUNET_log (GNUNET_ERROR_TYPE_ERROR, + "Bad mode `%s' specified\n", + mode); + percent_refund = 4; /* Fastest known */ + } + } + switch (percent_refund) + { + case 0: + query = "get_link"; + PREPARE (pg, + query, + "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"); + break; + case 1: + query = "get_link_v1"; + PREPARE (pg, + query, + "WITH rc AS MATERIALIZED (" + "SELECT" + " melt_serial_id" + " FROM refresh_commitments" + " WHERE old_coin_pub=$1" + ")" + "SELECT " + " tp.transfer_pub" + ",denoms.denom_pub" + ",rrc.ev_sig" + ",rrc.ewv" + ",rrc.link_sig" + ",rrc.freshcoin_index" + ",rrc.coin_ev " + "FROM " + "refresh_revealed_coins rrc" + " JOIN refresh_transfer_keys tp" + " USING (melt_serial_id)" + " JOIN denominations denoms" + " USING (denominations_serial)" + " WHERE rrc.melt_serial_id = (SELECT melt_serial_id FROM rc)" + " ORDER BY tp.transfer_pub, rrc.freshcoin_index ASC"); + break; + case 2: + query = "get_link_v2"; + PREPARE (pg, + query, + "SELECT" + " *" + " FROM" + " exchange_do_get_link_data" + " ($1) " + " AS " + " (transfer_pub BYTEA" + " ,denom_pub BYTEA" + " ,ev_sig BYTEA" + " ,ewv BYTEA" + " ,link_sig BYTEA" + " ,freshcoin_index INT4" + " ,coin_ev BYTEA);"); + break; + case 3: + query = "get_link_v3"; + PREPARE (pg, + query, + "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"); + break; + case 4: + query = "get_link_v4"; + PREPARE (pg, + query, + "WITH rc AS MATERIALIZED (" + "SELECT" + " melt_serial_id" + " FROM refresh_commitments" + " WHERE old_coin_pub=$1" + ")" + "SELECT " + " tp.transfer_pub" + ",denoms.denom_pub" + ",rrc.ev_sig" + ",rrc.ewv" + ",rrc.link_sig" + ",rrc.freshcoin_index" + ",rrc.coin_ev " + "FROM " + "refresh_revealed_coins rrc" + " JOIN refresh_transfer_keys tp" + " USING (melt_serial_id)" + " JOIN denominations denoms" + " USING (denominations_serial)" + " WHERE rrc.melt_serial_id = (SELECT melt_serial_id FROM rc)" + ); + break; + default: + GNUNET_break (0); + return GNUNET_DB_STATUS_HARD_ERROR; + } + + ldctx.ldc = ldc; + ldctx.ldc_cls = ldc_cls; + ldctx.status = GNUNET_OK; + qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn, + query, + params, + &add_ldl, + &ldctx); + if (GNUNET_OK != ldctx.status) + return GNUNET_DB_STATUS_HARD_ERROR; + return qs; +} |