Mercurial > servermonitor

annotate ServerMonitor/Objects/Checks/HttpCheck.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 b713b9db4c82
children 7645122aa7a9
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1 using System;
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2 using System.Collections.Generic;
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3 using System.ComponentModel;
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4 using System.IO;
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5 using System.Linq;
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6 using System.Net.Http;
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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 /// <summary>Executes an HTTP request and checks the result or status code.</summary>
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14 [DisplayName("HTTP check"), Description("Check the result of an HTTP request"), DisplayWeight(1)]
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15 public class HttpCheck : Check
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16 {
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17 /// <summary>The URL to request.</summary>
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18 public string Url { get; set; }
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19
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20 /// <summary>The HTTP method for the request.</summary>
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21 /// <remarks>Only HEAD and GET are supported.</remarks>
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22 public string Method { get; set; }
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23
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24 /// <summary>Whether the HTTP status code should be checked.</summary>
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25 public bool CheckResponseCode { get; set; }
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27 /// <summary>The required response code if CheckResponseCode is true.</summary>
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28 public int ResponseCode { get; set; }
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29
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30 /// <summary>Whether the response lenth should be checked.</summary>
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31 public bool CheckResponseLength { get; set; }
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32
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33 /// <summary>The required minimum response length if CheckResponseLength is true.</summary>
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34 public string ResponseLengthMin { get; set; }
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36 /// <summary>The required maximum response length if CheckResponseLength is true.</summary>
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37 public string ResponseLengthMax { get; set; }
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38
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39 /// <summary>Whether the response body should be checked.</summary>
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40 public bool CheckResponseBody { get; set; }
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41
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42 /// <summary>The method to use when checking the response content against the pattern.</summary>
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43 public MatchType ResponseBodyMatchType { get; set; }
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44
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45 /// <summary>The string or pattern that the response content must match if CheckResponseBody is true.</summary>
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46 public string ResponseBodyPattern { get; set; }
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47
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48 /// <summary>Whether the ResponseBodyPattern should be interpreted as a regular expression.</summary>
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49 public bool ResponseBodyUseRegex { get; set; }
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50
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51 /// <summary>Executes the HTTP command on the server.</summary>
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52 protected async override Task<CheckResult> ExecuteCheckAsync(CancellationToken token)
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53 {
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54 try
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55 {
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56 // Disable auto redirect so we can get the true response code of the request.
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57 using (HttpClientHandler handler = new HttpClientHandler() { AllowAutoRedirect = false })
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58 using (HttpClient client = new HttpClient(handler))
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59 using (HttpRequestMessage request = new HttpRequestMessage(new HttpMethod(Method), new Uri(Url)))
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60 {
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61 token.Register(client.CancelPendingRequests);
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62 HttpResponseMessage response = await client.SendAsync(request, token);
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63 token.ThrowIfCancellationRequested();
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64 List<CheckResult> results = await ProcessResponse(response);
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65 return MergeResults(results.ToArray());
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66 }
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67 }
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68 catch (Exception e)
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69 {
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70 return Fail(e);
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71 }
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72 }
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73
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74 ///// <summary>Processes an HTTP response and checks that it matches the expected values.</summary>
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75 ///// <param name="response">The HTTP response.</param>
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76 ///// <returns>A list of check results according to user preferences.</returns>
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77 protected async virtual Task<List<CheckResult>> ProcessResponse(HttpResponseMessage response)
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78 {
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79 List<CheckResult> results = new List<CheckResult>();
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80
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81 // Check the actual response code against the expected response code if response code checking is enabled.
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82 if (CheckResponseCode)
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83 results.Add(GetIntResult(ResponseCode, (int)response.StatusCode, "Response code"));
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84
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85 // Check the actual response length against the expected response length if response length checking is enabled.
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86 if (CheckResponseLength)
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87 {
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88 string length = null;
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89 if (Method == "HEAD")
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90 {
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91 // Use the Content-Length header if a HEAD request.
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92 if (response.Headers.TryGetValues("Content-Length", out IEnumerable<string> values))
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93 {
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94 length = values.First();
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95 }
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96 }
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97 else
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98 {
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99 // For a GET request, read the actual length
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100 Stream stream = await response.Content.ReadAsStreamAsync();
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101 length = stream.Length.ToString();
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102 }
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103 if (length != null)
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104 {
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105 results.Add(GetStringResult(MatchType.GreaterThan, (int.Parse(ResponseLengthMin) * 1024).ToString(), false, length, "Response length"));
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106 results.Add(GetStringResult(MatchType.LessThan, (int.Parse(ResponseLengthMax) * 1024).ToString(), false, length, "Response length"));
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107 }
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108 else
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109 {
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110 results.Add(Fail("Could not get content length"));
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111 }
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112 }
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113
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114 // Check the actual response content against the expected response content if response content checking is enabled.
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115 if (CheckResponseBody && Method != "HEAD")
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116 {
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117 string content = await response.Content.ReadAsStringAsync();
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118 results.Add(GetStringResult(ResponseBodyMatchType, ResponseBodyPattern, ResponseBodyUseRegex, content, "Response body"));
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119 }
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120
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121 return results;
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122 }
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123
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124 /// <summary>Validates HTTP check options.</summary>
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125 public override string Validate(bool saving = true)
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126 {
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127 string message = base.Validate();
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128 if (Url.IsNullOrEmpty())
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129 message += "URL cannot be blank." + Environment.NewLine;
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130 if (!CheckResponseCode && !CheckResponseLength && !CheckResponseBody)
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131 message += "At least one check must be enabled." + Environment.NewLine;
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132 if (CheckResponseBody && ResponseBodyUseRegex)
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133 {
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134 try
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135 {
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136 Regex re = new Regex(ResponseBodyPattern);
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137 }
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138 catch (ArgumentException)
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139 {
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140 message += "Invalid regular expression for response body." + Environment.NewLine;
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141 }
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142 }
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143 return message;
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144 }
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145
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146 }
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
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147 }