qdevices/qnetd-client-algo-timer.c

   1 /*
   2  * Copyright (c) 2015-2016 Red Hat, Inc.
   3  *
   4  * All rights reserved.
   5  *
   6  * Author: Jan Friesse (jfriesse@redhat.com)
   7  *
   8  * This software licensed under BSD license, the text of which follows:
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions are met:
  12  *
  13  * - Redistributions of source code must retain the above copyright notice,
  14  *   this list of conditions and the following disclaimer.
  15  * - Redistributions in binary form must reproduce the above copyright notice,
  16  *   this list of conditions and the following disclaimer in the documentation
  17  *   and/or other materials provided with the distribution.
  18  * - Neither the name of the Red Hat, Inc. nor the names of its
  19  *   contributors may be used to endorse or promote products derived from this
  20  *   software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  23  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include "qnetd-log.h"
  36 #include "qnetd-client-algo-timer.h"
  37 #include "qnetd-client-send.h"
  38 #include "qnetd-algorithm.h"
  39 #include "timer-list.h"
  40
  41 static int
  42 qnetd_client_algo_timer_callback(void *data1, void *data2)
  43 {
  44         struct qnetd_client *client;
  45         enum tlv_vote result_vote;
  46         int send_vote;
  47         int reschedule_timer;
  48         enum tlv_reply_error_code reply_error_code;
  49
  50         client = (struct qnetd_client *)data1;
  51
  52         result_vote = TLV_VOTE_WAIT_FOR_REPLY;
  53         send_vote = 0;
  54         reschedule_timer = 0;
  55
  56         reply_error_code = qnetd_algorithm_timer_callback(client, &reschedule_timer,
  57             &send_vote, &result_vote);
  58
  59         if (reply_error_code != TLV_REPLY_ERROR_CODE_NO_ERROR) {
  60                 qnetd_log(LOG_ERR, "Algorithm for client %s returned error code. "
  61                     "Sending error reply.", client->addr_str);
  62
  63                 if (qnetd_client_send_err(client, 0, 0, reply_error_code) != 0) {
  64                         client->schedule_disconnect = 1;
  65                         return (0);
  66                 }
  67
  68                 return (0);
  69         } else {
  70                 qnetd_log(LOG_DEBUG, "Algorithm for client %s decided to %s timer and %s vote "
  71                     "with value %s", client->addr_str,
  72                     (reschedule_timer ? "reschedule" : "not reschedule"),
  73                     (send_vote ? "send" : "not send"),
  74                     tlv_vote_to_str(result_vote));
  75         }
  76
  77         if (send_vote) {
  78                 client->algo_timer_vote_info_msq_seq_number++;
  79
  80                 if (qnetd_client_send_vote_info(client,
  81                     client->algo_timer_vote_info_msq_seq_number, &client->last_ring_id,
  82                     result_vote) != 0) {
  83                         client->schedule_disconnect = 1;
  84                         return (0);
  85                 }
  86         }
  87
  88         if (reschedule_timer) {
  89                 /*
  90                  * Timer list makes sure to schedule callback again
  91                  */
  92                 return (-1);
  93         }
  94
  95         client->algo_timer = NULL;
  96         return (0);
  97 }
  98
  99 int
 100 qnetd_client_algo_timer_is_scheduled(struct qnetd_client *client)
 101 {
 102
 103         return (client->algo_timer != NULL);
 104 }
 105
 106 int
 107 qnetd_client_algo_timer_schedule_timeout(struct qnetd_client *client, uint32_t timeout)
 108 {
 109
 110         if (qnetd_client_algo_timer_is_scheduled(client)) {
 111                 if (qnetd_client_algo_timer_abort(client) != 0) {
 112                         qnetd_log(LOG_ERR, "Can't abort algo timer");
 113
 114                         return (-1);
 115                 }
 116         }
 117
 118         client->algo_timer = timer_list_add(client->main_timer_list, timeout,
 119             qnetd_client_algo_timer_callback, (void *)client, NULL);
 120         if (client->algo_timer == NULL) {
 121                 qnetd_log(LOG_ERR, "Can't schedule algo timer");
 122
 123                 return (-1);
 124         }
 125
 126         return (0);
 127 }
 128
 129 int
 130 qnetd_client_algo_timer_schedule(struct qnetd_client *client)
 131 {
 132
 133         return (qnetd_client_algo_timer_schedule_timeout(client, client->heartbeat_interval / 4));
 134 }
 135
 136 int
 137 qnetd_client_algo_timer_abort(struct qnetd_client *client)
 138 {
 139
 140         if (qnetd_client_algo_timer_is_scheduled(client)) {
 141                 timer_list_delete(client->main_timer_list, client->algo_timer);
 142                 client->algo_timer = NULL;
 143         }
 144
 145         return (0);
 146 }