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pg_event_listen.c (1947B)

      1 /*
      2    This file is part of TALER
      3    Copyright (C) 2022 Taler Systems SA
      4 
      5    TALER is free software; you can redistribute it and/or modify it under the
      6    terms of the GNU General Public License as published by the Free Software
      7    Foundation; either version 3, or (at your option) any later version.
      8 
      9    TALER is distributed in the hope that it will be useful, but WITHOUT ANY
     10    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
     11    A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
     12 
     13    You should have received a copy of the GNU General Public License along with
     14    TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
     15  */
     16 /**
     17  * @file donaudb/pg_event_listen.c
     18  * @brief Implementation of the event_listen function for Postgres
     19  * @author Christian Grothoff
     20  */
     21 #include <donau_config.h>
     22 #include <taler/taler_error_codes.h>
     23 #include <taler/taler_dbevents.h>
     24 #include <taler/taler_pq_lib.h>
     25 #include "pg_event_listen.h"
     26 #include "pg_helper.h"
     27 
     28 /**
     29  * Register callback to be invoked on events of type @a es.
     30  *
     31  * @param cls database context to use
     32  * @param timeout how long until to generate a timeout event
     33  * @param es specification of the event to listen for
     34  * @param cb function to call when the event happens, possibly
     35  *         multiple times (until cancel is invoked)
     36  * @param cb_cls closure for @a cb
     37  * @return handle useful to cancel the listener
     38  */
     39 struct GNUNET_DB_EventHandler *
     40 DH_PG_event_listen (void *cls,
     41                     struct GNUNET_TIME_Relative timeout,
     42                     const struct GNUNET_DB_EventHeaderP *es,
     43                     GNUNET_DB_EventCallback cb,
     44                     void *cb_cls)
     45 {
     46   struct PostgresClosure *pg = cls;
     47 
     48   return GNUNET_PQ_event_listen (pg->conn,
     49                                  es,
     50                                  timeout,
     51                                  cb,
     52                                  cb_cls);
     53 }