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

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 3142e52cbe69
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1 using System;
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2 using System.Collections.Generic;
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3 using System.Diagnostics;
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4 using System.IO;
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5 using System.Linq;
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6 using System.Text;
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7 using System.Threading;
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8 using System.Threading.Tasks;
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9 using System.Xml.Serialization;
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10
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11 namespace ServerMonitorApp
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12 {
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13 public class ServerMonitor
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14 {
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15 private readonly string configFileDir;
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16 private readonly Logger logger;
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17 private readonly Dictionary<int, CancellationTokenSource> tokens = new Dictionary<int, CancellationTokenSource>();
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18 private bool running;
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19 private Dictionary<Task<CheckResult>, int> tasks;
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20 //private List<Task<CheckResult>> tasks;
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21
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22 public event EventHandler<CheckStatusChangedEventArgs> CheckStatusChanged;
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23
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24 public List<Server> Servers { get; private set; } = new List<Server>();
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25
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26 public IEnumerable<Check> Checks { get { return Servers.SelectMany(s => s.Checks); } }
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27
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28 public string ConfigFile { get; private set; }
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29
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30 public ServerMonitor()
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31 {
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32 configFileDir = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "ServerMonitor");
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33 ConfigFile = Path.Combine(configFileDir, "servers.xml");
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34 logger = new Logger(Path.Combine(configFileDir, "monitor.log"));
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35 }
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36
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37 public void AddServer(Server server)
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38 {
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39 Servers.Add(server);
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40 }
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41
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42 public void LoadServers()
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43 {
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44 TextReader reader = null;
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45 try
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46 {
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47 reader = new StreamReader(ConfigFile);
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48 XmlSerializer serializer = CreateXmlSerializer();
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49 Servers.Clear();
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50 Servers.AddRange((List<Server>)serializer.Deserialize(reader));
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51 // Update the Checks so they know what Server they belong to.
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52 // Would rather do this in the Server object on deserialization, but
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53 // that doesn't work when using the XML serializer for some reason.
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54 foreach (Server server in Servers)
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55 {
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56 foreach (Check check in server.Checks)
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57 {
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58 check.Server = server;
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59 }
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60 server.CheckModified += Server_CheckModified;
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61 }
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62 }
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63 // If the file doesn't exist, no special handling is needed. It will be created later.
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64 catch (FileNotFoundException) { }
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65 catch (DirectoryNotFoundException) { }
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66 catch (InvalidOperationException)
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67 {
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68 //TODO log
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69 throw;
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70 }
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71 finally
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72 {
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73 reader?.Close();
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74 }
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75 Run();
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76 }
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77
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78 public void SaveServers()
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79 {
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80 GenerateIds();
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81 TextWriter writer = null;
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82 XmlSerializer serializer = null;
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83 try
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84 {
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85 writer = new StreamWriter(ConfigFile);
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86 serializer = CreateXmlSerializer();
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87 serializer.Serialize(writer, Servers);
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88 }
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89 catch (DirectoryNotFoundException)
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90 {
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91 Directory.CreateDirectory(configFileDir);
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92 writer = new StreamWriter(ConfigFile);
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93 serializer = CreateXmlSerializer();
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94 serializer.Serialize(writer, Servers);
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95 }
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96 catch (Exception)
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97 {
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98 //TODO log
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99 throw;
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100 }
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101 finally
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102 {
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103 writer?.Close();
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104 }
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105 }
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106
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107 private async void Run()
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108 {
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109 if (running)
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110 return;
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111 running = true;
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112 //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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113 //tasks = Checks.Select(c => ScheduleExecuteCheckAsync(c)).ToList();
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114 tasks = Checks.ToDictionary(c => ScheduleExecuteCheckAsync(c), c => c.Id);
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115 while (tasks.Count > 0)
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116 {
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117 Task<CheckResult> task = await Task.WhenAny(tasks.Keys);
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118 tasks.Remove(task);
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119 try
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120 {
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121 CheckResult result = await task;
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122 // Result will be null if a scheduled check was disabled
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123 if (result != null && result.CheckStatus != CheckStatus.Disabled)
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124 tasks.Add(ScheduleExecuteCheckAsync(result.Check), result.Check.Id);
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125 }
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126 catch (OperationCanceledException)
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127 {
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128
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129 }
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130 }
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131 running = false;
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132 }
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133
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134 public async Task<CheckResult> ExecuteCheckAsync(Check check, CancellationToken token = default(CancellationToken))
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135 {
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136 check.Status = CheckStatus.Running;
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137 OnCheckStatusChanged(check);
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138 CheckResult result = await check.ExecuteAsync(token);
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139 OnCheckStatusChanged(check, result);
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140 logger.Log(result);
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141 return result;
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142 }
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143
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144 public IList<CheckResult> GetLog(Server server)
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145 {
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146 return logger.Read(server);
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147 }
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148
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149 private void OnCheckStatusChanged(Check check, CheckResult result = null)
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150 {
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151 SaveServers();
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152 CheckStatusChanged?.Invoke(check, new CheckStatusChangedEventArgs(check, result));
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153 }
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154
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155 private void Server_CheckModified(object sender, EventArgs e)
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156 {
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157 Check check = (Check)sender;
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158 Task<CheckResult> task = tasks.FirstOrDefault(kvp => kvp.Value == check.Id).Key;
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159 if (running)
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160 {
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161 if (task == null)
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162 {
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163 // No tasks associated with the check, so schedule a new one
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164 tasks.Add(ScheduleExecuteCheckAsync(check), check.Id);
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165 }
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166 else
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167 {
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168 // Check was modified or deleted, so remove any waiting tasks
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169 tasks.Remove(task);
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170 if (tokens.TryGetValue(check.Id, out CancellationTokenSource cts))
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171 cts.Cancel();
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172 if (check.Server != null)
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173 {
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174 // If the check was not deleted, schedule the new check.
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175 // But only if it's still running, otherwise restarting the monitor below
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176 // will create a duplicate run.
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177 if (running)
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178 tasks.Add(ScheduleExecuteCheckAsync(check), check.Id);
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179 }
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180 }
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181 }
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182 // Run again in case removing a task above caused it to stop
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183 Run();
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184 }
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185
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186 private async Task<CheckResult> ScheduleExecuteCheckAsync(Check check)
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187 {
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188 if (!check.Enabled)
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189 return await Task.FromResult(new CheckResult(check, CheckStatus.Disabled, null));
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190
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191 CancellationTokenSource cts = new CancellationTokenSource();
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192 tokens[check.Id] = cts;
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193 check.NextRunTime = check.Schedule.GetNextTime(check.LastScheduledRunTime);
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194 await Task.Delay(check.NextRunTime - DateTime.Now, cts.Token);
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195 check.LastScheduledRunTime = check.NextRunTime;
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196 return await ExecuteCheckAsync(check, cts.Token);
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197 }
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198
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199 private void GenerateIds()
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200 {
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201 if (Servers.Any())
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202 {
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203 int id = Servers.Max(s => s.Id);
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204 foreach (Server server in Servers)
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205 {
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206 if (server.Id == 0)
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207 server.Id = ++id;
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208 }
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209 }
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210
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211 //TODO if a check is deleted, there might be old results in the log file that share an ID with a new one
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212 if (Checks.Any())
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213 {
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214 int id = Checks.Max(c => c.Id);
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215 foreach (Check check in Checks)
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216 {
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217 if (check.Id == 0)
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218 check.Id = ++id;
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219 }
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220 }
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221 }
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222
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223 private XmlSerializer CreateXmlSerializer()
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224 {
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225 return new XmlSerializer(typeof(List<Server>), Check.CheckTypes);
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226 }
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227 }
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228
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229 public class CheckStatusChangedEventArgs : EventArgs
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230 {
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231 public Check Check { get; private set; }
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232
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233 public CheckResult CheckResult { get; private set; }
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234
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235 public CheckStatusChangedEventArgs(Check check, CheckResult result)
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236 {
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237 Check = check;
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238 CheckResult = result;
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239 }
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240
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241 }
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242 }