Mercurial > servermonitor

annotate ServerMonitor/Objects/Checks/Check.cs @ 15:23f2e0da1094

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- Fix the last execution status being lost after a check is edited. - Add comments.
author Brad Greco <brad@bgreco.net>
date Mon, 22 Apr 2019 21:11:27 -0400
parents 052aa62cb42a
children 7626b099aefd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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 LastRunStatus { get; set; }
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63
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64 public CheckStatus FailStatus { get; set; }
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65
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66 public int MaxConsecutiveFailures { get; set; }
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67
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68 [XmlIgnore]
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69 public int ConsecutiveFailures { get; set; }
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70
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71 [XmlIgnore]
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72 public Server Server { get; set; }
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73
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74 public Check()
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75 {
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76 FailStatus = CheckStatus.Error;
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77 }
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78
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79 public override string ToString()
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80 {
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81 return Name;
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82 }
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83
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84 public virtual string Validate(bool saving = true)
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85 {
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86 string message = string.Empty;
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87 if (Name.IsNullOrEmpty() && saving)
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88 message += "Name cannot be blank." + Environment.NewLine;
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89 return message;
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90 }
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91
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92 public async Task<CheckResult> ExecuteAsync(CancellationToken token = default(CancellationToken), bool update = true)
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93 {
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94 if (token.IsCancellationRequested)
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95 return null;
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96
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97 CheckResult result;
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98 DateTime startTime = DateTime.Now;
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99 try
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100 {
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101 Task<CheckResult> checkTask = ExecuteCheckAsync(token);
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102 try
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103 {
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104 if (await Task.WhenAny(checkTask, Task.Delay(Timeout, token)) == checkTask)
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105 {
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106 result = await checkTask;
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107 }
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108 else
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109 {
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110 result = Fail("Timed out.");
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111 }
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112 }
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113 catch (TaskCanceledException)
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114 {
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115 return null;
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116 }
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117 }
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118 catch (Exception e)
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119 {
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120 result = Fail(e.GetBaseException().Message);
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121 }
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122 result.StartTime = startTime;
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123 result.EndTime = DateTime.Now;
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124 // If a check is executed from the CheckForm, we don't want to update the status or log the event.
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125 if (update)
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126 {
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127 Status = result.CheckStatus;
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128 LastRunStatus = result.CheckStatus;
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129 LastMessage = result.Message;
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130 LastRunTime = result.EndTime;
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131 }
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132 return result;
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133 }
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134
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135 public CheckResult Pass(string message)
0
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136 {
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137 return new CheckResult(this, CheckStatus.Success, message);
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138 }
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139
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140 public CheckResult Fail(string message)
0
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141 {
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142 return new CheckResult(this, FailStatus, message);
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143 }
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144
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145 protected CheckResult Fail(Exception e)
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146 {
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147 return new CheckResult(this, FailStatus, e.GetBaseException().Message);
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148 }
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149
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150 protected CheckResult GetIntResult(int expectedValue, int resultValue, string description)
0
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151 {
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152 if (expectedValue == resultValue)
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153 return Pass(string.Format("{0}: {1}", description, resultValue));
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154 else
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155 return Fail(string.Format("{0}: {1} (expected: {2})", description, resultValue, expectedValue));
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156 }
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157
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158 protected CheckResult GetStringResult(MatchType matchType, string expectedPattern, bool useRegex, string resultValue, string description)
0
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159 {
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160 bool match;
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161 if (useRegex)
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162 {
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163 if (matchType.In(MatchType.Equals, MatchType.NotEquals))
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164 {
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165 if (!expectedPattern.StartsWith("^"))
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166 expectedPattern = "^" + expectedPattern;
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167 if (!expectedPattern.EndsWith("$"))
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168 expectedPattern += "$";
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169 }
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170 Regex re = new Regex(expectedPattern, RegexOptions.Singleline);
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171 match = re.IsMatch(resultValue);
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172 }
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173 else
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174 {
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175 if (matchType.In(MatchType.Equals, MatchType.NotEquals))
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176 {
0
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177 match = expectedPattern == resultValue;
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178 }
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179 else if (matchType.In(MatchType.Contains, MatchType.NotContains))
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180 {
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181 match = resultValue.Contains(expectedPattern);
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182 }
0
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183 else
1
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184 {
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185 if (decimal.TryParse(expectedPattern, out decimal expectedNumeric) &&
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186 decimal.TryParse(resultValue, out decimal resultNumeric))
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187 {
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188 match = (matchType == MatchType.GreaterThan && resultNumeric > expectedNumeric) ||
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189 (matchType == MatchType.LessThan && resultNumeric < expectedNumeric);
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190 }
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191 else
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192 {
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193 return Fail(string.Format("{0} is not numeric: {1}", description, resultValue));
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194 }
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195 }
0
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196 }
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197
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198 if (matchType.In(MatchType.Equals, MatchType.Contains))
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199 {
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200 if (match)
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201 return Pass(string.Format("{0} {1} the pattern: {2}", description, matchType.ToString().ToLower(), expectedPattern));
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202 else
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203 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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204 }
1
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205 else if (matchType.In(MatchType.NotEquals, MatchType.NotContains))
0
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206 {
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207 if (match)
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208 return Fail(string.Format("{0} {1} the pattern: {2} ({0}: {3})", description, matchType.ToString().ToLower().Replace("not", ""), expectedPattern, resultValue));
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209 else
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210 return Pass(string.Format("{0} does not {1} the pattern: {2}", description, matchType.ToString().ToLower().TrimEnd('s').Replace("not", ""), expectedPattern));
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211 }
1
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212 else
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213 {
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214 if (match)
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215 return Pass(string.Format("{0} ({1}) is {2} {3}", description, resultValue, matchType.ToString().ToLower().Replace("than", " than"), expectedPattern));
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216 else
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217 return Fail(string.Format("{0} ({1}) is not {2} {3}", description, resultValue, matchType.ToString().ToLower().Replace("than", " than"), expectedPattern));
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218 }
0
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219 }
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220
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221 protected CheckResult MergeResults(params CheckResult[] results)
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222 {
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223 StringBuilder message = new StringBuilder();
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224 bool failed = false;
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225 foreach (CheckResult result in results)
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226 {
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227 if (result == null)
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228 continue;
4
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229 if (result.Failed)
0
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230 failed = true;
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231 message.AppendLine(result.Message);
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232 }
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233 return failed ? Fail(message.ToString().Trim()) : Pass(message.ToString().Trim());
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234 }
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235
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236 protected abstract Task<CheckResult> ExecuteCheckAsync(CancellationToken token);
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237 }
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238 }