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annotate ServerMonitor/Objects/Checks/PingCheck.cs @ 23:3866c19535fd

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Fix NullReferenceException when checks are executed on a brand new server.
author Brad Greco <brad@bgreco.net>
date Thu, 30 May 2019 21:40:27 -0400
parents 68d7834dc28e
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 using System.ComponentModel;
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2 using System.Net.NetworkInformation;
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3 using System.Threading;
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4 using System.Threading.Tasks;
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5
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6 namespace ServerMonitorApp
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7 {
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8 /// <summary>Checks that a server responds to ping.</summary>
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9 [DisplayName("Ping check"), Description("Check if the server responds to a ping request"), DisplayWeight(0)]
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10 public class PingCheck : Check
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11 {
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12 /// <summary>Sends a ping and waits for a response.</summary>
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13 protected async override Task<CheckResult> ExecuteCheckAsync(CancellationToken token)
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14 {
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15 using (Ping ping = new Ping())
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16 {
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17 try
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18 {
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19 PingReply reply = await ping.SendPingAsync(Server.Host, Timeout);
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20 if (reply.Status == IPStatus.Success)
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21 return Pass(string.Format("Reply received in {0} ms", reply.RoundtripTime));
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22 else
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23 return Fail("Ping result: " + reply.Status);
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24 }
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25 catch (PingException e)
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26 {
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27 return Fail(e);
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28 }
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29 }
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30 }
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31 }
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32 }