121 lines
3.8 KiB
C
121 lines
3.8 KiB
C
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/*
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This file is part of TALER
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Copyright (C) 2014-2018 GNUnet e.V.
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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 taler-auditor-httpd_db.c
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* @brief Generic database operations for the auditor.
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* @author Christian Grothoff
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*/
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#include "platform.h"
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#include <pthread.h>
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#include <jansson.h>
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#include <gnunet/gnunet_json_lib.h>
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#include "taler_json_lib.h"
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#include "taler-auditor-httpd_db.h"
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#include "taler-auditor-httpd_responses.h"
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/**
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* How often should we retry a transaction before giving up
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* (for transactions resulting in serialization/dead locks only).
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*/
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#define MAX_TRANSACTION_COMMIT_RETRIES 100
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/**
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* Run a database transaction for @a connection.
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* Starts a transaction and calls @a cb. Upon success,
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* attempts to commit the transaction. Upon soft failures,
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* retries @a cb a few times. Upon hard or persistent soft
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* errors, generates an error message for @a connection.
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*
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* @param connection MHD connection to run @a cb for
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* @param name name of the transaction (for debugging)
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* @param[out] set to MHD response code, if transaction failed
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* @param cb callback implementing transaction logic
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* @param cb_cls closure for @a cb, must be read-only!
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* @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
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*/
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int
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TAH_DB_run_transaction (struct MHD_Connection *connection,
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const char *name,
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int *mhd_ret,
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TAH_DB_TransactionCallback cb,
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void *cb_cls)
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{
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struct TALER_AUDITORDB_Session *session;
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if (NULL != mhd_ret)
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*mhd_ret = -1; /* invalid value */
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if (NULL == (session = TAH_plugin->get_session (TAH_plugin->cls)))
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{
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GNUNET_break (0);
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if (NULL != mhd_ret)
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*mhd_ret = TAH_RESPONSE_reply_internal_db_error (connection,
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TALER_EC_DB_SETUP_FAILED);
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return GNUNET_SYSERR;
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}
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// TAH_plugin->preflight (TAH_plugin->cls, session); // FIXME: needed?
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for (unsigned int retries = 0;retries < MAX_TRANSACTION_COMMIT_RETRIES; retries++)
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{
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enum GNUNET_DB_QueryStatus qs;
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if (GNUNET_OK !=
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TAH_plugin->start (TAH_plugin->cls,
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session))
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{
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GNUNET_break (0);
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if (NULL != mhd_ret)
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*mhd_ret = TAH_RESPONSE_reply_internal_db_error (connection,
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TALER_EC_DB_START_FAILED);
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return GNUNET_SYSERR;
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}
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qs = cb (cb_cls,
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connection,
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session,
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mhd_ret);
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if (0 > qs)
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TAH_plugin->rollback (TAH_plugin->cls,
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session);
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if (GNUNET_DB_STATUS_HARD_ERROR == qs)
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return GNUNET_SYSERR;
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if (0 <= qs)
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qs = TAH_plugin->commit (TAH_plugin->cls,
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session);
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if (GNUNET_DB_STATUS_HARD_ERROR == qs)
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{
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if (NULL != mhd_ret)
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*mhd_ret = TAH_RESPONSE_reply_commit_error (connection,
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TALER_EC_DB_COMMIT_FAILED_HARD);
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return GNUNET_SYSERR;
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}
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/* make sure callback did not violate invariants! */
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GNUNET_assert ( (NULL == mhd_ret) ||
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(-1 == *mhd_ret) );
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if (0 <= qs)
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return GNUNET_OK;
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}
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TALER_LOG_ERROR ("Transaction `%s' commit failed %u times\n",
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name,
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MAX_TRANSACTION_COMMIT_RETRIES);
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if (NULL != mhd_ret)
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*mhd_ret = TAH_RESPONSE_reply_commit_error (connection,
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TALER_EC_DB_COMMIT_FAILED_ON_RETRY);
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return GNUNET_SYSERR;
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}
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/* end of taler-auditor-httpd_db.c */
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