Mercurial > servermonitor

annotate ServerMonitor/Objects/Check.cs @ 0:3e1a2131f897

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Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
author Brad Greco <brad@bgreco.net>
date Mon, 31 Dec 2018 18:32:14 -0500
parents
children 9e92780ebc0f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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1 using System;
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2 using System.Linq;
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3 using System.Text;
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4 using System.Text.RegularExpressions;
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5 using System.Threading;
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6 using System.Threading.Tasks;
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7 using System.Xml.Serialization;
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8
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9 namespace ServerMonitorApp
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10 {
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11 /*public enum CheckType
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12 {
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13 Command
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14 }*/
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15
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16 public enum CheckStatus
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17 {
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18 Success,
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19 Information,
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20 Warning,
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21 Error,
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22 Running,
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23 Disabled,
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24 }
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25
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26 public abstract class Check
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27 {
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28 private static Type[] _checkTypes;
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29
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30 public static Type[] CheckTypes
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31 {
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32 get
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33 {
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34 return _checkTypes ?? (_checkTypes = typeof(Check).Assembly.GetTypes()
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35 .Where(t => t.IsSubclassOf(typeof(Check)))
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36 .OrderBy(t => t.GetAttribute<DisplayWeightAttribute>()?.DisplayWeight).ToArray());
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37 }
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38 }
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39
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40 public int Id { get; set; }
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41
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42 public string Name { get; set; }
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43
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44 /*public CheckType Type { get; set; }*/
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45
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46 public int Timeout { get; set; }
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47
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48 public bool Enabled { get; set; }
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49
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50 public Schedule Schedule { get; set; }
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51
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52 public DateTime LastRunTime { get; set; }
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53
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54 public DateTime LastScheduledRunTime { get; set; }
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55
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56 public DateTime NextRunTime { get; set; }
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57
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58 public string LastMessage { get; set; }
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59
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60 public CheckStatus Status { get; set; }
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61
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62 public CheckStatus FailStatus { get; set; }
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63
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64 [XmlIgnore]
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65 public Server Server { get; set; }
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66
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67 public Check()
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68 {
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69 FailStatus = CheckStatus.Error;
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70 }
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71
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72 public override string ToString()
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73 {
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74 return Name;
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75 }
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76
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77 public virtual string Validate(bool saving = true)
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78 {
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79 string message = string.Empty;
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80 if (Name.IsNullOrEmpty() && saving)
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81 message += "Name cannot be blank." + Environment.NewLine;
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82 return message;
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83 }
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84
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85 //public virtual CheckStatus Execute()
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86 //{
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87 // //TODO
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88 // throw new NotImplementedException();
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89 //}
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90
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91 public async Task<CheckResult> ExecuteAsync(CancellationToken token = default(CancellationToken), bool update = true)
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92 {
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93 //TODO check cancellation token before proceeding
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94 CheckResult result;
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95 DateTime startTime = DateTime.Now;
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96 try
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97 {
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98 Task<CheckResult> checkTask = ExecuteCheckAsync(token);
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99 try
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100 {
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101 if (await Task.WhenAny(checkTask, Task.Delay(Timeout, token)) == checkTask)
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102 {
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103 result = await checkTask;
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104 }
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105 else
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106 {
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107 result = Fail("Timed out.");
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108 }
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109 }
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110 catch (TaskCanceledException)
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111 {
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112 return null;
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113 }
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114 }
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115 catch (Exception e)
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116 {
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117 result = Fail(e.GetBaseException().Message);
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118 }
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119 result.StartTime = startTime;
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120 result.EndTime = DateTime.Now;
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121 // If a check is executed from the CheckForm, we don't want to update the status or log the event.
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122 if (update)
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123 {
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124 Status = result.CheckStatus;
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125 LastMessage = result.Message;
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126 LastRunTime = result.EndTime;
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127 }
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128 return result;
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129 }
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130
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131 protected CheckResult Pass(string message)
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132 {
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133 return new CheckResult(this, CheckStatus.Success, message);
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134 }
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135
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136 protected CheckResult Fail(string message)
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137 {
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138 return new CheckResult(this, FailStatus, message);
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139 }
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140
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141 protected CheckResult Fail(Exception e)
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142 {
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143 return new CheckResult(this, FailStatus, e.GetBaseException().Message);
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144 }
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145
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146 protected virtual CheckResult GetIntResult(int expectedValue, int resultValue, string description)
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147 {
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148 if (expectedValue == resultValue)
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149 return Pass(string.Format("{0}: {1}", description, resultValue));
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150 else
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151 return Fail(string.Format("{0}: {1} (expected: {2})", description, resultValue, expectedValue));
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152 }
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153
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154 protected virtual CheckResult GetStringResult(MatchType matchType, string expectedPattern, bool useRegex, string resultValue, string description)
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155 {
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156 bool match;
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157 if (useRegex)
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158 {
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159 if (matchType.In(MatchType.Equals, MatchType.NotEquals))
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160 {
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161 if (!expectedPattern.StartsWith("^"))
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162 expectedPattern = "^" + expectedPattern;
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163 if (!expectedPattern.EndsWith("$"))
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164 expectedPattern += "$";
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165 }
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166 Regex re = new Regex(expectedPattern, RegexOptions.Singleline);
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167 match = re.IsMatch(resultValue);
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168 }
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169 else
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170 {
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171 if (matchType.In(MatchType.Equals, MatchType.NotEquals))
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172 match = expectedPattern == resultValue;
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173 else
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174 match = resultValue.Contains(expectedPattern);
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175 }
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176
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177 if (matchType.In(MatchType.Equals, MatchType.Contains))
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178 {
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179 if (match)
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180 return Pass(string.Format("{0} {1} the pattern: {2}", description, matchType.ToString().ToLower(), expectedPattern));
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181 else
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182 return Fail(string.Format("{0} does not {1} the pattern: {2} ({0}: {3})", description, matchType.ToString().ToLower().TrimEnd('s'), expectedPattern, resultValue));
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183 }
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184 else
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185 {
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186 if (match)
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187 return Fail(string.Format("{0} {1} the pattern: {2} ({0}: {3})", description, matchType.ToString().ToLower().Replace("not", ""), expectedPattern, resultValue));
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188 else
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189 return Pass(string.Format("{0} does not {1} the pattern: {2}", description, matchType.ToString().ToLower().TrimEnd('s').Replace("not", ""), expectedPattern));
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190 }
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191 }
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192
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193 protected CheckResult MergeResults(params CheckResult[] results)
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194 {
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195 StringBuilder message = new StringBuilder();
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196 bool failed = false;
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197 foreach (CheckResult result in results)
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198 {
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199 if (result == null)
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200 continue;
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201 if (result.CheckStatus != CheckStatus.Success)
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202 failed = true;
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203 message.AppendLine(result.Message);
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204 }
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205 return failed ? Fail(message.ToString().Trim()) : Pass(message.ToString().Trim());
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206 }
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207
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208 protected abstract Task<CheckResult> ExecuteCheckAsync(CancellationToken token);
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209 }
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210 }