Line data    Source code

       1              : /*
       2              :    This file is part of TALER
       3              :    Copyright (C) 2022, 2026 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 exchangedb/update_shard_progress.c
      18              :  * @brief Implementation of the update_shard_progress function for Postgres
      19              :  * @author Christian Grothoff
      20              :  */
      21              : #include "taler/taler_pq_lib.h"
      22              : #include "exchange-database/update_shard_progress.h"
      23              : #include "helper.h"
      24              : 
      25              : 
      26              : enum GNUNET_DB_QueryStatus
      27           80 : TALER_EXCHANGEDB_update_shard_progress (
      28              :   struct TALER_EXCHANGEDB_PostgresContext *pg,
      29              :   const char *job_name,
      30              :   uint64_t start_row,
      31              :   uint64_t end_row,
      32              :   uint64_t progress_row,
      33              :   struct GNUNET_TIME_Relative lease)
      34              : {
      35              :   struct GNUNET_TIME_Absolute lease_until
      36           80 :     = GNUNET_TIME_relative_to_absolute (lease);
      37           80 :   struct GNUNET_PQ_QueryParam params[] = {
      38           80 :     GNUNET_PQ_query_param_string (job_name),
      39           80 :     GNUNET_PQ_query_param_uint64 (&start_row),
      40           80 :     GNUNET_PQ_query_param_uint64 (&end_row),
      41           80 :     GNUNET_PQ_query_param_uint64 (&progress_row),
      42           80 :     GNUNET_PQ_query_param_absolute_time (&lease_until),
      43              :     GNUNET_PQ_query_param_end
      44              :   };
      45              : 
      46           80 :   GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
      47              :               "Shard %s (%llu,%llu] progressed to %llu\n",
      48              :               job_name,
      49              :               (unsigned long long) start_row,
      50              :               (unsigned long long) end_row,
      51              :               (unsigned long long) progress_row);
      52              :   /* GREATEST() keeps this monotonic: a worker that lost the shard to a second
      53              :      one and only notices later must not push the marker back. Both the
      54              :      'completed' flag and the lease renewal ride along on this one statement,
      55              :      so a caller never needs a second round-trip (let alone a second
      56              :      transaction) to say "and that was the last of it". */
      57           80 :   PREPARE (pg,
      58              :            "update_shard_progress",
      59              :            "UPDATE work_shards"
      60              :            "   SET progress_row=GREATEST(progress_row,$4)"
      61              :            "      ,completed=(GREATEST(progress_row,$4) >= end_row)"
      62              :            "      ,last_attempt=$5"
      63              :            " WHERE job_name=$1"
      64              :            "   AND start_row=$2"
      65              :            "   AND end_row=$3;");
      66           80 :   return GNUNET_PQ_eval_prepared_non_select (pg->conn,
      67              :                                              "update_shard_progress",
      68              :                                              params);
      69              : }