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/*
This file is part of TALER
Copyright (C) 2023 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 pg_helper.c
* @brief shared internal definitions for postgres DB plugin
* @author Christian Grothoff
*/
#include "platform.h"
#include "pg_helper.h"
#include <gnunet/gnunet_util_lib.h>
#include <gnunet/gnunet_pq_lib.h>
#include <taler/taler_util.h>
#include <taler/taler_pq_lib.h>
#include <taler/taler_json_lib.h>
#include <taler/taler_mhd_lib.h>
enum GNUNET_GenericReturnValue
TMH_PG_start (void *cls,
const char *name)
{
struct PostgresClosure *pg = cls;
struct GNUNET_PQ_ExecuteStatement es[] = {
GNUNET_PQ_make_execute ("START TRANSACTION ISOLATION LEVEL SERIALIZABLE"),
GNUNET_PQ_EXECUTE_STATEMENT_END
};
GNUNET_assert (NULL != name);
check_connection (pg);
postgres_preflight (pg);
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Starting merchant DB transaction `%s'\n",
name);
if (GNUNET_OK !=
GNUNET_PQ_exec_statements (pg->conn,
es))
{
TALER_LOG_ERROR ("Failed to start transaction\n");
GNUNET_break (0);
return GNUNET_SYSERR;
}
pg->transaction_name = name;
return GNUNET_OK;
}
enum GNUNET_GenericReturnValue
TMH_PG_start_read_committed (void *cls,
const char *name)
{
struct PostgresClosure *pg = cls;
struct GNUNET_PQ_ExecuteStatement es[] = {
GNUNET_PQ_make_execute ("START TRANSACTION ISOLATION LEVEL READ COMMITTED"),
GNUNET_PQ_EXECUTE_STATEMENT_END
};
GNUNET_assert (NULL != name);
check_connection (pg);
postgres_preflight (pg);
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Starting merchant DB transaction %s (READ COMMITTED)\n",
name);
if (GNUNET_OK !=
GNUNET_PQ_exec_statements (pg->conn,
es))
{
TALER_LOG_ERROR ("Failed to start transaction\n");
GNUNET_break (0);
return GNUNET_SYSERR;
}
pg->transaction_name = name;
return GNUNET_OK;
}
void
TMH_PG_rollback (void *cls)
{
struct PostgresClosure *pg = cls;
struct GNUNET_PQ_ExecuteStatement es[] = {
GNUNET_PQ_make_execute ("ROLLBACK"),
GNUNET_PQ_EXECUTE_STATEMENT_END
};
if (NULL == pg->transaction_name)
return;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Rolling back merchant DB transaction `%s'\n",
pg->transaction_name);
GNUNET_break (GNUNET_OK ==
GNUNET_PQ_exec_statements (pg->conn,
es));
pg->transaction_name = NULL;
}
enum GNUNET_DB_QueryStatus
TMH_PG_commit (void *cls)
{
struct PostgresClosure *pg = cls;
struct GNUNET_PQ_QueryParam params[] = {
GNUNET_PQ_query_param_end
};
enum GNUNET_DB_QueryStatus qs;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Committing merchant DB transaction %s\n",
pg->transaction_name);
check_connection (pg);
PREPARE (pg,
"merchant_commit",
"COMMIT");
qs = GNUNET_PQ_eval_prepared_non_select (pg->conn,
"merchant_commit",
params);
if (qs < 0)
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
"Failed to commit transaction\n");
TMH_PG_rollback (pg);
return qs;
}
pg->transaction_name = NULL;
return qs;
}
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