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/*
This file is part of TALER
Copyright (C) 2024 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 donau-httpd_db.c
* @brief Generic database operations for the donau.
* @author Christian Grothoff
*/
#include <taler/platform.h>
#include <pthread.h>
#include <jansson.h>
#include <gnunet/gnunet_json_lib.h>
#include <taler/taler_json_lib.h>
#include <taler/taler_mhd_lib.h>
#include "donaudb_lib.h"
#include "donau-httpd_db.h"
// #include "donau-httpd_responses.h"
enum GNUNET_GenericReturnValue
DH_DB_run_transaction (struct MHD_Connection *connection,
const char *name,
enum DH_MetricTypeRequest mt,
MHD_RESULT *mhd_ret,
DH_DB_TransactionCallback cb,
void *cb_cls)
{
if (NULL != mhd_ret)
*mhd_ret = -1; /* set to invalid value, to help detect bugs */
if (GNUNET_OK !=
DH_plugin->preflight (DH_plugin->cls))
{
GNUNET_break (0);
if (NULL != mhd_ret)
*mhd_ret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_DB_SETUP_FAILED,
NULL);
return GNUNET_SYSERR;
}
GNUNET_assert (mt < DH_MT_REQUEST_COUNT);
DH_METRICS_num_requests[mt]++;
for (unsigned int retries = 0;
retries < MAX_TRANSACTION_COMMIT_RETRIES;
retries++)
{
enum GNUNET_DB_QueryStatus qs;
if (GNUNET_OK !=
DH_plugin->start (DH_plugin->cls,
name))
{
GNUNET_break (0);
if (NULL != mhd_ret)
*mhd_ret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_DB_START_FAILED,
NULL);
return GNUNET_SYSERR;
}
qs = cb (cb_cls,
connection,
mhd_ret);
if (0 > qs)
{
DH_plugin->rollback (DH_plugin->cls);
if (GNUNET_DB_STATUS_HARD_ERROR == qs)
return GNUNET_SYSERR;
}
else
{
qs = DH_plugin->commit (DH_plugin->cls);
if (GNUNET_DB_STATUS_HARD_ERROR == qs)
{
DH_plugin->rollback (DH_plugin->cls);
if (NULL != mhd_ret)
*mhd_ret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_DB_COMMIT_FAILED,
NULL);
return GNUNET_SYSERR;
}
if (0 > qs)
DH_plugin->rollback (DH_plugin->cls);
}
/* make sure callback did not violate invariants! */
GNUNET_assert ( (NULL == mhd_ret) ||
(-1 == (int) *mhd_ret) );
if (0 <= qs)
return GNUNET_OK;
DH_METRICS_num_conflict[mt]++;
}
DH_plugin->rollback (DH_plugin->cls);
TALER_LOG_ERROR ("Transaction `%s' commit failed %u times\n",
name,
MAX_TRANSACTION_COMMIT_RETRIES);
if (NULL != mhd_ret)
*mhd_ret = TALER_MHD_reply_with_error (connection,
MHD_HTTP_INTERNAL_SERVER_ERROR,
TALER_EC_GENERIC_DB_SOFT_FAILURE,
NULL);
return GNUNET_SYSERR;
}
/* end of donau-httpd_db.c */
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