qdevices/qdevice-net-echo-request-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 "qdevice-net-algorithm.h"
  36 #include "qdevice-net-echo-request-timer.h"
  37 #include "qdevice-net-send.h"
  38 #include "qdevice-log.h"
  39
  40 static int
  41 qdevice_net_echo_request_timer_callback(void *data1, void *data2)
  42 {
  43         struct qdevice_net_instance *instance;
  44
  45         instance = (struct qdevice_net_instance *)data1;
  46
  47         if (instance->echo_reply_received_msg_seq_num !=
  48             instance->echo_request_expected_msg_seq_num) {
  49                 qdevice_log(LOG_ERR, "Server didn't send echo reply message on time");
  50
  51                 if (qdevice_net_algorithm_echo_reply_not_received(instance) != 0) {
  52                         qdevice_log(LOG_DEBUG, "Algorithm decided to disconnect");
  53
  54                         instance->schedule_disconnect = 1;
  55                         instance->disconnect_reason =
  56                             QDEVICE_NET_DISCONNECT_REASON_ALGO_ECHO_REPLY_NOT_RECEIVED_ERR;
  57
  58                         instance->echo_request_timer = NULL;
  59                         return (0);
  60                 } else {
  61                         qdevice_log(LOG_DEBUG, "Algorithm decided to continue send heartbeat");
  62
  63                         return (-1);
  64                 }
  65         }
  66
  67         if (qdevice_net_send_echo_request(instance) == -1) {
  68                 instance->disconnect_reason = QDEVICE_NET_DISCONNECT_REASON_CANT_ALLOCATE_MSG_BUFFER;
  69
  70                 instance->schedule_disconnect = 1;
  71                 instance->echo_request_timer = NULL;
  72                 return (0);
  73         }
  74
  75         /*
  76          * Schedule this function callback again
  77          */
  78         return (-1);
  79 }
  80
  81 int
  82 qdevice_net_echo_request_timer_schedule(struct qdevice_net_instance *instance)
  83 {
  84         instance->echo_request_expected_msg_seq_num = 0;
  85         instance->echo_reply_received_msg_seq_num = 0;
  86
  87         if (instance->echo_request_timer != NULL) {
  88                 timer_list_delete(&instance->main_timer_list, instance->echo_request_timer);
  89                 instance->echo_request_timer = NULL;
  90         }
  91
  92         qdevice_log(LOG_DEBUG, "Scheduling send of heartbeat every %"PRIu32"ms", instance->heartbeat_interval);
  93         instance->echo_request_timer = timer_list_add(&instance->main_timer_list,
  94             instance->heartbeat_interval, qdevice_net_echo_request_timer_callback,
  95             (void *)instance, NULL);
  96
  97         if (instance->echo_request_timer == NULL) {
  98                 qdevice_log(LOG_ERR, "Can't schedule regular sending of heartbeat.");
  99
 100                 instance->disconnect_reason = QDEVICE_NET_DISCONNECT_REASON_CANT_SCHEDULE_HB_TIMER;
 101
 102                 return (-1);
 103         }
 104
 105         return (0);
 106 }