Mercurial > servermonitor

annotate ServerMonitor/Objects/Checks/SshCheck.cs @ 14:2db36ab759de

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author Brad Greco <brad@bgreco.net>
date Mon, 22 Apr 2019 21:10:42 -0400
parents a36cc5c123f4
children 68d7834dc28e
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1 using Renci.SshNet;
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2 using System;
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3 using System.Collections.Generic;
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4 using System.ComponentModel;
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5 using System.Linq;
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6 using System.Text;
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7 using System.Text.RegularExpressions;
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8 using System.Threading;
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9 using System.Threading.Tasks;
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10
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11 namespace ServerMonitorApp
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12 {
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13 [DisplayName("SSH check"), Description("Check the result of a command run over SSH"), DisplayWeight(10)]
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14 public class SshCheck : Check
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15 {
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16 public virtual string Command { get; set; }
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17
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18 public bool CheckExitCode { get; set; }
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19
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20 public int ExitCode { get; set; }
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21
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22 public bool CheckCommandOutput { get; set; }
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23
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24 public MatchType CommandOutputMatchType { get; set; }
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25
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26 public string CommandOutputPattern { get; set; }
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27
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28 public bool CommandOutputUseRegex { get; set; }
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29
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30 protected override Task<CheckResult> ExecuteCheckAsync(CancellationToken token)
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31 {
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32 try
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33 {
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34 if (!Server.SshClient.IsConnected)
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35 {
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36 if (Server.LoginType == LoginType.PrivateKey && Server.PrivateKeyFile == null)
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37 return Task.FromResult(Fail(string.Format("Private key '{0}' is locked or not accessible", Server.KeyFile)));
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38 Server.SshClient.Connect();
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39 }
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40 }
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41 catch (Exception e)
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42 {
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43 return Task.FromResult(Fail(e));
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44 }
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45 return Task.Run(() =>
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46 {
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47 try
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48 {
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49 token.ThrowIfCancellationRequested();
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50 using (SshCommand command = Server.SshClient.CreateCommand(Command))
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51 {
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52 token.Register(command.CancelAsync);
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53 IAsyncResult ar = command.BeginExecute();
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54 token.ThrowIfCancellationRequested();
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55 string output = (command.EndExecute(ar).Trim() + command.Error.Trim()).ConvertNewlines();
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56 return MergeResults(ProcessCommandResult(output, command.ExitStatus).ToArray());
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57 }
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58 }
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59 catch (Exception e)
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60 {
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61 return Fail(e);
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62 }
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63 }, token);
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64 }
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65
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66 protected virtual List<CheckResult> ProcessCommandResult(string output, int exitCode)
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67 {
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68 List<CheckResult> results = new List<CheckResult>();
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69 if (CheckCommandOutput)
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70 results.Add(GetStringResult(CommandOutputMatchType, CommandOutputPattern, CommandOutputUseRegex, output, "Command output"));
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71 if (CheckExitCode)
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72 {
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73 CheckResult result = GetIntResult(ExitCode, exitCode, "Exit code");
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74 if (result.Failed)
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75 result.Message += ". Command output: " + output;
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76 results.Add(result);
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77 }
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78 return results;
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79 }
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80
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81 public override string Validate(bool saving = true)
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82 {
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83 string message = base.Validate();
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84 if (Server.Port <= 0)
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85 message += "Server SSH port is required." + Environment.NewLine;
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86 if (Server.Username.IsNullOrEmpty())
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87 message += "Server SSH username is required." + Environment.NewLine;
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88 if (Server.LoginType == LoginType.Password && Server.Password.IsNullOrEmpty())
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89 message += "Server SSH password is required." + Environment.NewLine;
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90 if (Server.LoginType == LoginType.PrivateKey && Server.KeyFile.IsNullOrEmpty())
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91 message += "Server SSH key is required." + Environment.NewLine;
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92 if (Command.IsNullOrEmpty())
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93 message += "Command is required." + Environment.NewLine;
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94 if (!CheckExitCode && !CheckCommandOutput)
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95 message += "At least one check must be enabled." + Environment.NewLine;
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96 if (CheckCommandOutput && CommandOutputUseRegex)
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97 {
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98 try
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99 {
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100 Regex re = new Regex(CommandOutputPattern);
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101 }
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102 catch (ArgumentException)
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103 {
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104 message += "Invalid regular expression for command output." + Environment.NewLine;
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105 }
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106 }
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107 return message;
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108 }
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109 }
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110 }