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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 backenddb/pg_select_open_transfers.c
* @brief Implementation of the select_open_transfers function for Postgres
* @author Christian Grothoff
*/
#include "platform.h"
#include <taler/taler_error_codes.h>
#include <taler/taler_dbevents.h>
#include <taler/taler_pq_lib.h>
#include "pg_select_open_transfers.h"
#include "pg_helper.h"
/**
* Context used for open_transfers_cb().
*/
struct SelectOpenTransfersContext
{
/**
* Postgres context.
*/
struct PostgresClosure *pg;
/**
* Function to call with the results.
*/
TALER_MERCHANTDB_OpenTransferCallback cb;
/**
* Closure for @a cb.
*/
void *cb_cls;
/**
* Internal result.
*/
enum GNUNET_DB_QueryStatus qs;
};
/**
* Function to be called with the results of a SELECT statement
* that has returned @a num_results results about rewards.
*
* @param[in,out] cls of type `struct SelectOpenTransfersContext *`
* @param result the postgres result
* @param num_results the number of results in @a result
*/
static void
open_transfers_cb (void *cls,
PGresult *result,
unsigned int num_results)
{
struct SelectOpenTransfersContext *plc = cls;
for (unsigned int i = 0; i < num_results; i++)
{
uint64_t rowid;
char *instance_id;
char *exchange_url;
char *payto_uri;
struct TALER_WireTransferIdentifierRawP wtid;
struct TALER_Amount total;
struct GNUNET_TIME_Absolute next_attempt;
struct GNUNET_PQ_ResultSpec rs[] = {
GNUNET_PQ_result_spec_uint64 ("credit_serial",
&rowid),
GNUNET_PQ_result_spec_string ("instance_id",
&instance_id),
GNUNET_PQ_result_spec_string ("exchange_url",
&exchange_url),
GNUNET_PQ_result_spec_string ("payto_uri",
&payto_uri),
GNUNET_PQ_result_spec_auto_from_type ("wtid",
&wtid),
TALER_PQ_result_spec_amount_with_currency ("credit_amount",
&total),
GNUNET_PQ_result_spec_absolute_time ("next_attempt",
&next_attempt),
GNUNET_PQ_result_spec_end
};
if (GNUNET_OK !=
GNUNET_PQ_extract_result (result,
rs,
i))
{
GNUNET_break (0);
plc->qs = GNUNET_DB_STATUS_HARD_ERROR;
return;
}
plc->cb (plc->cb_cls,
rowid,
instance_id,
exchange_url,
payto_uri,
&wtid,
&total,
next_attempt);
GNUNET_PQ_cleanup_result (rs);
}
}
enum GNUNET_DB_QueryStatus
TMH_PG_select_open_transfers (void *cls,
uint64_t limit,
TALER_MERCHANTDB_OpenTransferCallback cb,
void *cb_cls)
{
struct PostgresClosure *pg = cls;
struct SelectOpenTransfersContext plc = {
.pg = pg,
.cb = cb,
.cb_cls = cb_cls
};
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_uint64 (&limit),
GNUNET_PQ_query_param_end
};
enum GNUNET_DB_QueryStatus qs;
PREPARE (pg,
"select_open_transfers",
"SELECT"
" credit_serial"
",merchant_id AS instance_id"
",exchange_url"
",payto_uri"
",wtid"
",credit_amount"
",ready_time AS next_attempt"
" FROM merchant_transfers"
" JOIN merchant_accounts"
" USING (account_serial)"
" JOIN merchant_instances"
" USING (merchant_serial)"
" WHERE confirmed AND"
" NOT (failed OR verified)"
" ORDER BY ready_time ASC"
" LIMIT $1;");
qs = GNUNET_PQ_eval_prepared_multi_select (
pg->conn,
"select_open_transfers",
params,
&open_transfers_cb,
&plc);
if (0 != plc.qs)
return plc.qs;
return qs;
}
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