366 lines
10 KiB
C
366 lines
10 KiB
C
/*
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This file is part of TALER
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Copyright (C) 2022 Taler Systems SA
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TALER is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 3, or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
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*/
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/**
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* @file exchangedb/pg_get_link_data.c
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* @brief Implementation of the get_link_data function for Postgres
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include "taler_error_codes.h"
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#include "taler_dbevents.h"
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#include "taler_pq_lib.h"
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#include "pg_get_link_data.h"
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#include "pg_helper.h"
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/**
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* Closure for #add_ldl().
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*/
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struct LinkDataContext
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{
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/**
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* Function to call on each result.
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*/
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TALER_EXCHANGEDB_LinkCallback ldc;
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/**
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* Closure for @e ldc.
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*/
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void *ldc_cls;
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/**
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* Last transfer public key for which we have information in @e last.
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* Only valid if @e last is non-NULL.
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*/
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struct TALER_TransferPublicKeyP transfer_pub;
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/**
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* Status, set to #GNUNET_SYSERR on errors,
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*/
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enum GNUNET_GenericReturnValue status;
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};
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/**
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* Free memory of the link data list.
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*
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* @param ldl link data list to release
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*/
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static void
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free_link_data_list (struct TALER_EXCHANGEDB_LinkList *ldl)
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{
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struct TALER_EXCHANGEDB_LinkList *next;
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while (NULL != ldl)
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{
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next = ldl->next;
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TALER_denom_pub_free (&ldl->denom_pub);
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TALER_blinded_denom_sig_free (&ldl->ev_sig);
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GNUNET_free (ldl);
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ldl = next;
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}
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}
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struct Results
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{
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struct TALER_EXCHANGEDB_LinkList *pos;
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struct TALER_TransferPublicKeyP transfer_pub;
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};
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static int
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transfer_pub_cmp (const void *a,
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const void *b)
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{
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const struct Results *ra = a;
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const struct Results *rb = b;
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return GNUNET_memcmp (&ra->transfer_pub,
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&rb->transfer_pub);
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}
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/**
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* Function to be called with the results of a SELECT statement
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* that has returned @a num_results results.
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*
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* @param cls closure of type `struct LinkDataContext *`
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* @param result the postgres result
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* @param num_results the number of results in @a result
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*/
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static void
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add_ldl (void *cls,
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PGresult *result,
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unsigned int num_results)
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{
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struct LinkDataContext *ldctx = cls;
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struct Results *temp = GNUNET_new_array (num_results,
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struct Results);
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unsigned int temp_off = 0;
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for (int i = num_results - 1; i >= 0; i--)
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{
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struct TALER_EXCHANGEDB_LinkList *pos;
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pos = GNUNET_new (struct TALER_EXCHANGEDB_LinkList);
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{
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struct TALER_BlindedPlanchet bp;
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struct GNUNET_PQ_ResultSpec rs[] = {
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GNUNET_PQ_result_spec_auto_from_type ("transfer_pub",
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&temp[temp_off].transfer_pub),
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GNUNET_PQ_result_spec_auto_from_type ("link_sig",
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&pos->orig_coin_link_sig),
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TALER_PQ_result_spec_blinded_denom_sig ("ev_sig",
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&pos->ev_sig),
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GNUNET_PQ_result_spec_uint32 ("freshcoin_index",
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&pos->coin_refresh_offset),
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TALER_PQ_result_spec_exchange_withdraw_values ("ewv",
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&pos->alg_values),
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TALER_PQ_result_spec_denom_pub ("denom_pub",
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&pos->denom_pub),
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TALER_PQ_result_spec_blinded_planchet ("coin_ev",
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&bp),
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GNUNET_PQ_result_spec_end
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};
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if (GNUNET_OK !=
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GNUNET_PQ_extract_result (result,
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rs,
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i))
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{
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GNUNET_break (0);
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GNUNET_free (pos);
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ldctx->status = GNUNET_SYSERR;
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return;
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}
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if (TALER_DENOMINATION_CS == bp.cipher)
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{
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pos->nonce = bp.details.cs_blinded_planchet.nonce;
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pos->have_nonce = true;
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}
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TALER_blinded_planchet_free (&bp);
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}
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temp[temp_off].pos = pos;
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temp_off++;
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}
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qsort (temp,
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temp_off,
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sizeof (struct Results),
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&transfer_pub_cmp);
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if (temp_off > 0)
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{
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struct TALER_EXCHANGEDB_LinkList *head = NULL;
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head = temp[0].pos;
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for (unsigned int i = 1; i < temp_off; i++)
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{
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struct TALER_EXCHANGEDB_LinkList *pos = temp[i].pos;
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const struct TALER_TransferPublicKeyP *tp = &temp[i].transfer_pub;
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if (0 == GNUNET_memcmp (tp,
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&temp[i - 1].transfer_pub))
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{
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pos->next = head;
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head = pos;
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}
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else
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{
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ldctx->ldc (ldctx->ldc_cls,
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&temp[i - 1].transfer_pub,
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head);
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free_link_data_list (head);
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head = pos;
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}
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}
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ldctx->ldc (ldctx->ldc_cls,
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&temp[temp_off - 1].transfer_pub,
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head);
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free_link_data_list (head);
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}
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GNUNET_free (temp);
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}
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enum GNUNET_DB_QueryStatus
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TEH_PG_get_link_data (void *cls,
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const struct TALER_CoinSpendPublicKeyP *coin_pub,
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TALER_EXCHANGEDB_LinkCallback ldc,
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void *ldc_cls)
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{
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struct PostgresClosure *pg = cls;
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struct GNUNET_PQ_QueryParam params[] = {
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GNUNET_PQ_query_param_auto_from_type (coin_pub),
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GNUNET_PQ_query_param_end
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};
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enum GNUNET_DB_QueryStatus qs;
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struct LinkDataContext ldctx;
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static int percent_refund = -2;
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const char *query;
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if (-2 == percent_refund)
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{
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const char *mode = getenv ("TALER_POSTGRES_GET_LINK_DATA_LOGIC");
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char dummy;
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if ( (NULL==mode) ||
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(1 != sscanf (mode,
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"%d%c",
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&percent_refund,
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&dummy)) )
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{
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if (NULL != mode)
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GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
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"Bad mode `%s' specified\n",
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mode);
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percent_refund = 4; /* Fastest known */
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}
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}
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switch (percent_refund)
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{
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case 0:
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query = "get_link";
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PREPARE (pg,
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query,
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"SELECT "
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" tp.transfer_pub"
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",denoms.denom_pub"
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",rrc.ev_sig"
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",rrc.ewv"
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",rrc.link_sig"
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",rrc.freshcoin_index"
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",rrc.coin_ev"
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" FROM refresh_commitments"
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" JOIN refresh_revealed_coins rrc"
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" USING (melt_serial_id)"
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" JOIN refresh_transfer_keys tp"
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" USING (melt_serial_id)"
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" JOIN denominations denoms"
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" ON (rrc.denominations_serial = denoms.denominations_serial)"
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" WHERE old_coin_pub=$1"
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" ORDER BY tp.transfer_pub, rrc.freshcoin_index ASC");
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break;
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case 1:
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query = "get_link_v1";
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PREPARE (pg,
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query,
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"WITH rc AS MATERIALIZED ("
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"SELECT"
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" melt_serial_id"
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" FROM refresh_commitments"
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" WHERE old_coin_pub=$1"
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")"
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"SELECT "
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" tp.transfer_pub"
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",denoms.denom_pub"
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",rrc.ev_sig"
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",rrc.ewv"
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",rrc.link_sig"
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",rrc.freshcoin_index"
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",rrc.coin_ev "
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"FROM "
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"refresh_revealed_coins rrc"
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" JOIN refresh_transfer_keys tp"
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" USING (melt_serial_id)"
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" JOIN denominations denoms"
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" USING (denominations_serial)"
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" WHERE rrc.melt_serial_id = (SELECT melt_serial_id FROM rc)"
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" ORDER BY tp.transfer_pub, rrc.freshcoin_index ASC");
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break;
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case 2:
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query = "get_link_v2";
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PREPARE (pg,
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query,
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"SELECT"
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" *"
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" FROM"
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" exchange_do_get_link_data"
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" ($1) "
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" AS "
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" (transfer_pub BYTEA"
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" ,denom_pub BYTEA"
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" ,ev_sig BYTEA"
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" ,ewv BYTEA"
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" ,link_sig BYTEA"
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" ,freshcoin_index INT4"
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" ,coin_ev BYTEA);");
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break;
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case 3:
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query = "get_link_v3";
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PREPARE (pg,
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query,
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"SELECT "
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" tp.transfer_pub"
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",denoms.denom_pub"
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",rrc.ev_sig"
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",rrc.ewv"
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",rrc.link_sig"
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",rrc.freshcoin_index"
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",rrc.coin_ev"
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" FROM refresh_commitments"
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" JOIN refresh_revealed_coins rrc"
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" USING (melt_serial_id)"
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" JOIN refresh_transfer_keys tp"
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" USING (melt_serial_id)"
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" JOIN denominations denoms"
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" ON (rrc.denominations_serial = denoms.denominations_serial)"
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" WHERE old_coin_pub=$1");
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break;
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case 4:
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query = "get_link_v4";
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PREPARE (pg,
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query,
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"WITH rc AS MATERIALIZED ("
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"SELECT"
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" melt_serial_id"
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" FROM refresh_commitments"
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" WHERE old_coin_pub=$1"
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")"
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"SELECT "
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" tp.transfer_pub"
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",denoms.denom_pub"
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",rrc.ev_sig"
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",rrc.ewv"
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",rrc.link_sig"
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",rrc.freshcoin_index"
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",rrc.coin_ev "
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"FROM "
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"refresh_revealed_coins rrc"
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" JOIN refresh_transfer_keys tp"
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" USING (melt_serial_id)"
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" JOIN denominations denoms"
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" USING (denominations_serial)"
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" WHERE rrc.melt_serial_id = (SELECT melt_serial_id FROM rc)"
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);
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break;
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default:
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GNUNET_break (0);
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return GNUNET_DB_STATUS_HARD_ERROR;
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}
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ldctx.ldc = ldc;
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ldctx.ldc_cls = ldc_cls;
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ldctx.status = GNUNET_OK;
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qs = GNUNET_PQ_eval_prepared_multi_select (pg->conn,
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query,
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params,
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&add_ldl,
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&ldctx);
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if (GNUNET_OK != ldctx.status)
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return GNUNET_DB_STATUS_HARD_ERROR;
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return qs;
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}
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