Mercurial > servermonitor

annotate ServerMonitor/Objects/ServerMonitor.cs @ 4:3142e52cbe69

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Lots more progress
author Brad Greco <brad@bgreco.net>
date Sun, 10 Feb 2019 20:51:26 -0500
parents 3e1a2131f897
children b6fe203af9d5
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1 using ServerMonitorApp.Properties;
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2 using System;
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3 using System.Collections.Generic;
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4 using System.Diagnostics;
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5 using System.IO;
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6 using System.Linq;
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7 using System.Net.NetworkInformation;
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8 using System.Text;
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9 using System.Threading;
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10 using System.Threading.Tasks;
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11 using System.Windows.Forms;
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12 using System.Xml.Serialization;
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13
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14 namespace ServerMonitorApp
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15 {
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16 public class ServerMonitor
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17 {
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18 private readonly string configFileDir;
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19 private readonly Logger logger;
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20 private readonly Dictionary<int, CancellationTokenSource> tokens = new Dictionary<int, CancellationTokenSource>();
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21 private readonly List<int> pausedChecks = new List<int>();
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22 private bool running, networkAvailable;
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23 private Dictionary<Task<CheckResult>, int> tasks;
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24 private ServerSummaryForm mainForm;
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25
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26 //private List<Task<CheckResult>> tasks;
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27
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28 public event EventHandler<CheckStatusChangedEventArgs> CheckStatusChanged;
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29
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30 public List<Server> Servers { get; private set; } = new List<Server>();
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31
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32 public IEnumerable<Check> Checks => Servers.SelectMany(s => s.Checks);
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33
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34 public string ConfigFile { get; private set; }
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35
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36 public ServerMonitor(ServerSummaryForm mainForm)
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37 {
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38 this.mainForm = mainForm;
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39 configFileDir = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "ServerMonitor");
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40 ConfigFile = Path.Combine(configFileDir, "servers.xml");
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41 logger = new Logger(Path.Combine(configFileDir, "monitor.log"));
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42 }
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43
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44 public void AddServer(Server server)
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45 {
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46 Servers.Add(server);
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47 SaveServers();
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48 }
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49
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50 public void DeleteServer(Server server)
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51 {
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52 Servers.Remove(server);
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53 SaveServers();
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54 }
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55
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56 public void LoadServers()
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57 {
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58 TextReader reader = null;
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59 try
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60 {
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61 reader = new StreamReader(ConfigFile);
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62 XmlSerializer serializer = CreateXmlSerializer();
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63 Servers.Clear();
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64 Servers.AddRange((List<Server>)serializer.Deserialize(reader));
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65 // Update the Checks so they know what Server they belong to.
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66 // Would rather do this in the Server object on deserialization, but
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67 // that doesn't work when using the XML serializer for some reason.
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68 foreach (Server server in Servers)
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69 {
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70 foreach (Check check in server.Checks)
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71 {
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72 check.Server = server;
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73 if (check.Status == CheckStatus.Running)
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74 check.Status = check.LastRunStatus;
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75 }
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76 server.CheckModified += Server_CheckModified;
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77 server.EnabledChanged += Server_EnabledChanged;
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78 }
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79 }
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80 // If the file doesn't exist, no special handling is needed. It will be created later.
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81 catch (FileNotFoundException) { }
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82 catch (DirectoryNotFoundException) { }
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83 catch (InvalidOperationException)
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84 {
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85 //TODO log
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86 throw;
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87 }
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88 finally
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89 {
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90 reader?.Close();
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91 }
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92 NetworkChange.NetworkAddressChanged += NetworkChange_NetworkAddressChanged;
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93 Run();
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94 }
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95
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96 public void SaveServers()
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97 {
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98 GenerateIds();
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99 TextWriter writer = null;
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100 XmlSerializer serializer = null;
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101 try
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102 {
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103 writer = new StreamWriter(ConfigFile);
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104 serializer = CreateXmlSerializer();
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105 serializer.Serialize(writer, Servers);
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106 }
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107 catch (DirectoryNotFoundException)
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108 {
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109 Directory.CreateDirectory(configFileDir);
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110 writer = new StreamWriter(ConfigFile);
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111 serializer = CreateXmlSerializer();
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112 serializer.Serialize(writer, Servers);
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113 }
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114 catch (Exception)
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115 {
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116 //TODO log
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117 throw;
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118 }
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119 finally
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120 {
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121 writer?.Close();
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122 }
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123 }
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124
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125 private async void Run()
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126 {
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127 if (running)
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128 return;
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129 running = true;
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130 networkAvailable = Helpers.IsNetworkAvailable();
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131 if (networkAvailable)
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132 {
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133 foreach (int id in pausedChecks)
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134 {
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135 await ExecuteCheckAsync(Checks.FirstOrDefault(c => c.Id == id));
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136 }
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137 pausedChecks.Clear();
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138 }
0
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139 //TODO subscribe to power events. Find any check's NextExecutionTime is in the past. Cancel waiting task and run immediately (or after short delay).
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140 //tasks = Checks.Select(c => ScheduleExecuteCheckAsync(c)).ToList();
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141 tasks = Checks.ToDictionary(c => ScheduleExecuteCheckAsync(c), c => c.Id);
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142 while (tasks.Count > 0)
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143 {
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144 Task<CheckResult> task = await Task.WhenAny(tasks.Keys);
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145 tasks.Remove(task);
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146 try
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147 {
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148 CheckResult result = await task;
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149 // Result will be null if a scheduled check was disabled
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150 if (result != null && result.CheckStatus != CheckStatus.Disabled)
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151 tasks.Add(ScheduleExecuteCheckAsync(result.Check), result.Check.Id);
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152 }
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153 catch (OperationCanceledException)
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154 {
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155
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156 }
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157 }
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158 running = false;
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159 }
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160
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161 public async Task<CheckResult> ExecuteCheckAsync(Check check, CancellationToken token = default(CancellationToken))
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162 {
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163 check.Status = CheckStatus.Running;
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164 OnCheckStatusChanged(check);
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165 CheckResult result = await check.ExecuteAsync(token);
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166 OnCheckStatusChanged(check, result);
4
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167 HandleResultAsync(result);
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168 return result;
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169 }
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170
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171 private void HandleResultAsync(CheckResult result)
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172 {
0
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173 logger.Log(result);
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174 if (result.FailAction == FailAction.FlashTaskbar)
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175 mainForm.AlertServerForm(result.Check);
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176 if (result.FailAction.In(FailAction.FlashTaskbar, FailAction.NotificationBalloon))
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177 mainForm.ShowBalloon(result);
0
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178 }
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179
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180 public IList<CheckResult> GetLog(Server server)
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181 {
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182 return logger.Read(server);
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183 }
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184
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185 private void OnCheckStatusChanged(Check check, CheckResult result = null)
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186 {
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187 SaveServers();
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188 CheckStatusChanged?.Invoke(check, new CheckStatusChangedEventArgs(check, result));
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189 }
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190
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191 private void Server_CheckModified(object sender, EventArgs e)
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192 {
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193 Check check = (Check)sender;
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194 Task<CheckResult> task = tasks.FirstOrDefault(kvp => kvp.Value == check.Id).Key;
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195 if (running)
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196 {
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197 if (task == null)
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198 {
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199 // No tasks associated with the check, so schedule a new one
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200 tasks.Add(ScheduleExecuteCheckAsync(check), check.Id);
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201 }
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202 else
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203 {
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204 // Check was modified or deleted, so remove any waiting tasks
4
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205 CancelCheck(check);
0
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206 if (check.Server != null)
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207 {
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208 // If the check was not deleted, schedule the new check.
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209 // But only if it's still running, otherwise restarting the monitor below
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210 // will create a duplicate run.
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211 if (running)
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212 tasks.Add(ScheduleExecuteCheckAsync(check), check.Id);
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213 }
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214 }
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215 }
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216 // Run again in case removing a task above caused it to stop
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217 Run();
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218 }
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219
4
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220 private void Server_EnabledChanged(object sender, EventArgs e)
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221 {
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222 Server server = (Server)sender;
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223 if (server.Enabled)
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224 {
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225 Run();
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226 }
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227 else
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228 {
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229 foreach (Check check in server.Checks)
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230 {
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231 CancelCheck(check);
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232 }
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233 }
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234 }
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235
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236 private void CancelCheck(Check check)
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237 {
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238 Task<CheckResult> task = tasks.FirstOrDefault(kvp => kvp.Value == check.Id).Key;
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239 tasks.Remove(task);
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240 pausedChecks.RemoveAll(id => id == check.Id);
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241 if (tokens.TryGetValue(check.Id, out CancellationTokenSource cts))
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242 cts.Cancel();
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243 }
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244
0
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245 private async Task<CheckResult> ScheduleExecuteCheckAsync(Check check)
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246 {
4
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247 if (!check.Enabled || !check.Server.Enabled)
0
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248 return await Task.FromResult(new CheckResult(check, CheckStatus.Disabled, null));
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249
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250 CancellationTokenSource cts = new CancellationTokenSource();
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251 tokens[check.Id] = cts;
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252 check.NextRunTime = check.Schedule.GetNextTime(check.LastScheduledRunTime);
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253 await Task.Delay(check.NextRunTime - DateTime.Now, cts.Token);
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254 check.LastScheduledRunTime = check.NextRunTime;
4
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diff changeset
255 if (networkAvailable)
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256 return await ExecuteCheckAsync(check, cts.Token);
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257 else
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258 {
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259 if (!pausedChecks.Contains(check.Id))
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260 pausedChecks.Add(check.Id);
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261 return await Task.FromResult(new CheckResult(check, CheckStatus.Disabled, null));
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262 }
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263 }
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264
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265 private void NetworkChange_NetworkAddressChanged(object sender, EventArgs e)
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266 {
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267 networkAvailable = Helpers.IsNetworkAvailable();
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268 if (networkAvailable)
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269 mainForm.Invoke((MethodInvoker)(() => Run()));
0
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270 }
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271
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272 private void GenerateIds()
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273 {
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274 if (Servers.Any())
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275 {
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276 int id = Servers.Max(s => s.Id);
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277 foreach (Server server in Servers)
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278 {
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279 if (server.Id == 0)
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280 server.Id = ++id;
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281 }
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282 }
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283
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284 if (Checks.Any())
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285 {
4
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286 int id = Math.Max(Settings.Default.MaxCheckId, Checks.Max(c => c.Id));
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287 foreach (Check check in Checks)
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288 {
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289 if (check.Id == 0)
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290 check.Id = ++id;
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291 }
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292 Settings.Default.MaxCheckId = id;
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293 Settings.Default.Save();
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294 }
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295 }
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296
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297 private XmlSerializer CreateXmlSerializer()
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298 {
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299 return new XmlSerializer(typeof(List<Server>), Check.CheckTypes);
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300 }
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301 }
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302
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303 public class CheckStatusChangedEventArgs : EventArgs
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304 {
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305 public Check Check { get; private set; }
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306
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307 public CheckResult CheckResult { get; private set; }
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308
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309 public CheckStatusChangedEventArgs(Check check, CheckResult result)
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310 {
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311 Check = check;
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312 CheckResult = result;
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313 }
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314 }
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315
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316 public enum FailAction { FlashTaskbar = 0, NotificationBalloon = 1, None = 10 }
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317 }