Mercurial > servermonitor
annotate ServerMonitor/Objects/ServerMonitor.cs @ 29:f6235dc0a8ec
Add ability to play a sound on check failure.
| author | Brad Greco <brad@bgreco.net> |
|---|---|
| date | Fri, 14 Jun 2019 21:01:55 -0400 |
| parents | 437442cd8090 |
| children | 2ffb0bda7705 |
| rev | line source |
|---|---|
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1 using Microsoft.Win32; |
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2 using NAudio.Wave; |
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3 using Renci.SshNet; |
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4 using Renci.SshNet.Common; |
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5 using ServerMonitorApp.Properties; |
| 4 | 6 using System; |
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7 using System.Collections.Generic; |
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8 using System.IO; |
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9 using System.Linq; |
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10 using System.Media; |
| 4 | 11 using System.Net.NetworkInformation; |
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12 using System.Threading; |
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13 using System.Threading.Tasks; |
| 4 | 14 using System.Windows.Forms; |
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15 using System.Xml.Serialization; |
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16 |
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17 namespace ServerMonitorApp |
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18 { |
| 17 | 19 /// <summary>Central class for scheduling and executing checks against remote servers.</summary> |
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20 public class ServerMonitor |
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21 { |
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22 private readonly string configFileDir; |
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23 private readonly Logger logger; |
| 17 | 24 // Cancellation tokens for executing checks, keyed by check ID. |
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25 private readonly Dictionary<int, CancellationTokenSource> tokens = new Dictionary<int, CancellationTokenSource>(); |
| 17 | 26 // SSH private keys, keyed by the path to the private key file. |
| 27 // A value of NULL indicates that the private key is inaccessible or encrypted. | |
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28 private readonly Dictionary<string, PrivateKeyFile> privateKeys = new Dictionary<string, PrivateKeyFile>(); |
| 17 | 29 // IDs of all checks that have been paused due to network unavailability, |
| 30 // or due to the system being suspended. | |
| 31 // Not to be confused with checks that have been disabled by the user. | |
| 4 | 32 private readonly List<int> pausedChecks = new List<int>(); |
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33 private bool running, networkAvailable, suspend; |
| 17 | 34 // List of check execution tasks that have been started. |
| 35 // A check task begins by sleeping until the next scheduled execution time, | |
| 36 // then executes. | |
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37 private Dictionary<Task<CheckResult>, int> tasks; |
| 4 | 38 private ServerSummaryForm mainForm; |
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39 private WaveOut waveOut = new WaveOut(); |
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40 MediaFoundationReader mediaReader; |
| 4 | 41 |
| 17 | 42 /// <summary>Fires when the status of a check changes.</summary> |
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43 public event EventHandler<CheckStatusChangedEventArgs> CheckStatusChanged; |
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44 |
| 17 | 45 /// <summary>The collection of registered servers.</summary> |
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46 public List<Server> Servers { get; private set; } = new List<Server>(); |
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47 |
| 17 | 48 /// <summary>A collection of all checks belonging to all registerd servers.</summary> |
| 4 | 49 public IEnumerable<Check> Checks => Servers.SelectMany(s => s.Checks); |
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50 |
| 17 | 51 /// <summary>Path to the file that stores server and check configuration.</summary> |
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52 public string ConfigFile { get; private set; } |
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53 |
| 17 | 54 /// <summary>Path to the file that stores server and check configuration.</summary> |
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55 public IEnumerable<string> LockedKeys { get { return privateKeys.Where(kvp => kvp.Value == null).Select(kvp => kvp.Key); } } |
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56 |
| 17 | 57 /// <summary>ServerMonitor constructor.</summary> |
| 58 /// <param name="mainForm">A reference to the main form.</param> | |
| 4 | 59 public ServerMonitor(ServerSummaryForm mainForm) |
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60 { |
| 4 | 61 this.mainForm = mainForm; |
| 17 | 62 // Store configuration in %appdata%\ServerMonitor |
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63 configFileDir = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "ServerMonitor"); |
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64 ConfigFile = Path.Combine(configFileDir, "servers.xml"); |
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65 logger = new Logger(Path.Combine(configFileDir, "monitor.log")); |
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66 } |
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67 |
| 17 | 68 /// <summary>Registers a new server with the server monitor.</summary> |
| 69 /// <param name="server">The server to be added.</param> | |
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70 public void AddServer(Server server) |
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71 { |
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72 Servers.Add(server); |
| 4 | 73 SaveServers(); |
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74 server.CheckModified += Server_CheckModified; |
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75 server.EnabledChanged += Server_EnabledChanged; |
| 4 | 76 } |
| 77 | |
| 17 | 78 /// <summary>Deletes a server from the server monitor.</summary> |
| 79 /// <param name="server">The server to be deleted.</param> | |
| 4 | 80 public void DeleteServer(Server server) |
| 81 { | |
| 82 Servers.Remove(server); | |
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83 // Cancel all queued and executing checks belonging to a |
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84 // server that was deleted. |
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85 foreach (Check check in server.Checks) |
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86 { |
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87 CancelCheck(check); |
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88 } |
| 4 | 89 SaveServers(); |
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90 } |
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91 |
| 17 | 92 /// <summary>Loads all servers and checks from the config file.</summary> |
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93 public void LoadServers() |
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94 { |
| 17 | 95 bool triedBackup = false; |
| 96 | |
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97 Read: |
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98 TextReader reader = null; |
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99 try |
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100 { |
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101 reader = new StreamReader(ConfigFile); |
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102 XmlSerializer serializer = CreateXmlSerializer(); |
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103 Servers.Clear(); |
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104 Servers.AddRange((List<Server>)serializer.Deserialize(reader)); |
| 17 | 105 // Do some more set-up now that the servers and checks have been loaded. |
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106 foreach (Server server in Servers) |
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107 { |
| 17 | 108 // Read private keys into memory if they are accessible and not encrypted. |
| 109 // If PrivateKeyFile != null, it means same the key has already been loaded for | |
| 110 // a different server and nothing more needs to be done. | |
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111 if (server.LoginType == LoginType.PrivateKey && server.PrivateKeyFile == null) |
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112 OpenPrivateKey(server.KeyFile); |
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113 foreach (Check check in server.Checks) |
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114 { |
| 17 | 115 // Update the checks so they know what server they belong to. |
| 116 // Would rather do this in the Server object on deserialization, but | |
| 117 // that doesn't work when using the XML serializer for some reason. | |
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118 check.Server = server; |
| 17 | 119 // If the program last exited while the check was running, change its status |
| 120 // to the result of its last execution (since, at this point, the check is | |
| 121 // not running). | |
| 4 | 122 if (check.Status == CheckStatus.Running) |
| 123 check.Status = check.LastRunStatus; | |
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124 } |
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125 server.CheckModified += Server_CheckModified; |
| 4 | 126 server.EnabledChanged += Server_EnabledChanged; |
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127 } |
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128 } |
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129 // If the file doesn't exist, no special handling is needed. It will be created later. |
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130 catch (FileNotFoundException) { } |
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131 catch (DirectoryNotFoundException) { } |
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132 catch (InvalidOperationException) |
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133 { |
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134 reader?.Close(); |
| 17 | 135 // If there was an error parsing the XML, try again with the backup config file. |
| 136 if (!triedBackup) | |
| 137 { | |
| 138 File.Copy(ConfigFile, ConfigFile + ".error", true); | |
| 139 string backupConfig = ConfigFile + ".bak"; | |
| 140 if (File.Exists(backupConfig)) | |
| 141 { | |
| 142 File.Copy(backupConfig, ConfigFile, true); | |
| 143 } | |
| 144 triedBackup = true; | |
| 145 goto Read; | |
| 146 } | |
| 147 else | |
| 148 { | |
| 149 // If there was an error reading the backup file too, give up. | |
| 150 throw; | |
| 151 } | |
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152 } |
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153 finally |
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154 { |
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155 reader?.Close(); |
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156 } |
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157 Application.ApplicationExit += Application_ApplicationExit; |
| 4 | 158 NetworkChange.NetworkAddressChanged += NetworkChange_NetworkAddressChanged; |
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159 SystemEvents.PowerModeChanged += SystemEvents_PowerModeChanged; |
| 17 | 160 |
| 161 // Remove old entries from the log file according to user preferences. | |
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162 logger.TrimLog(); |
| 17 | 163 |
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164 Run(); |
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165 } |
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166 |
| 17 | 167 /// <summary>Saves all servers and checks to the config file.</summary> |
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168 public void SaveServers() |
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169 { |
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170 GenerateIds(); |
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171 TextWriter writer = null; |
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172 XmlSerializer serializer = null; |
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173 try |
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174 { |
| 17 | 175 // Make a backup first in case something goes wrong in the middle of writing. |
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176 File.Copy(ConfigFile, ConfigFile + ".bak", true); |
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177 } |
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178 catch { } |
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179 try |
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180 { |
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181 writer = new StreamWriter(ConfigFile); |
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182 serializer = CreateXmlSerializer(); |
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183 serializer.Serialize(writer, Servers); |
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184 } |
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185 catch (DirectoryNotFoundException) |
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186 { |
| 17 | 187 // If the directory does not exist, create it and try again. |
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188 Directory.CreateDirectory(configFileDir); |
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189 writer = new StreamWriter(ConfigFile); |
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190 serializer = CreateXmlSerializer(); |
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191 serializer.Serialize(writer, Servers); |
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192 } |
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193 finally |
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194 { |
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195 writer?.Close(); |
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196 } |
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197 } |
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198 |
| 17 | 199 /// <summary>Main server monitor loop. Schedules and executes checks.</summary> |
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200 private async void Run() |
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201 { |
| 17 | 202 // Do not run again if already running or if the system is suspending or resuming. |
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203 if (running || suspend) |
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204 return; |
| 17 | 205 |
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206 running = true; |
| 17 | 207 |
| 208 // If the network is available, immediately execute checks that were supposed to run | |
| 209 // earlier but could not due to network unavailability or the system being suspended. | |
| 4 | 210 networkAvailable = Helpers.IsNetworkAvailable(); |
| 211 if (networkAvailable) | |
| 212 { | |
| 213 foreach (int id in pausedChecks) | |
| 214 { | |
| 215 await ExecuteCheckAsync(Checks.FirstOrDefault(c => c.Id == id)); | |
| 216 } | |
| 217 pausedChecks.Clear(); | |
| 218 } | |
| 17 | 219 |
| 220 // Schedule all checks to run according to their schedules. | |
| 221 // Each check will sleep until it is scheduled to run, then execute. | |
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222 tasks = Checks.ToDictionary(c => ScheduleExecuteCheckAsync(c), c => c.Id); |
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223 while (tasks.Count > 0) |
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224 { |
| 17 | 225 // When any check is done sleeping and executing, remove the completed |
| 226 // task and queue a new task to schedule it again. | |
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227 Task<CheckResult> task = await Task.WhenAny(tasks.Keys); |
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228 tasks.Remove(task); |
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229 try |
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230 { |
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231 CheckResult result = await task; |
| 17 | 232 // Do not schedule the task again if it is now disabled. |
| 233 // Result will be null if a scheduled check was disabled. | |
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234 if (result != null && result.CheckStatus != CheckStatus.Disabled) |
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235 tasks.Add(ScheduleExecuteCheckAsync(result.Check), result.Check.Id); |
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236 } |
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237 catch (OperationCanceledException) |
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238 { |
| 17 | 239 // When a server's state changes to Disabled, any checks that are executing |
| 240 // are immediately cancelled. Silently catch these expected exceptions. | |
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241 } |
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242 } |
| 17 | 243 // If there are no enabled checks scheduled, exit the main loop. |
| 244 // It will be restarted when a check or server is enabled. | |
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245 running = false; |
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246 } |
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247 |
| 17 | 248 /// <summary>Schedules a check to be run on its schedule.</summary> |
| 249 /// <param name="check">The check to execute.</param> | |
| 250 /// <returns>The async check result.</returns> | |
| 251 private async Task<CheckResult> ScheduleExecuteCheckAsync(Check check) | |
| 252 { | |
| 253 // Do not schedule or execute the check if it or its server is disabled. | |
| 254 if (!check.Enabled || !check.Server.Enabled) | |
| 255 return await Task.FromResult(new CheckResult(check, CheckStatus.Disabled, null)); | |
| 256 | |
| 257 // Create a cancellation token that will be used to cancel the check if it or | |
| 258 // its server is disabled while it is executing. | |
| 259 CancellationTokenSource cts = new CancellationTokenSource(); | |
| 260 tokens[check.Id] = cts; | |
| 261 | |
| 262 // Sleep until next time the check is supposed to be executed. | |
| 263 // Use the LastScheduledRunTime so manual executions by the user do not | |
| 264 // interfere with the schedule. | |
| 265 check.NextRunTime = check.Schedule.GetNextTime(check.LastScheduledRunTime); | |
| 266 int delay = Math.Max(0, (int)(check.NextRunTime - DateTime.Now).TotalMilliseconds); | |
| 267 await Task.Delay(delay, cts.Token); | |
| 268 check.LastScheduledRunTime = check.NextRunTime; | |
| 269 | |
| 270 // Execute the check if not cancelled. | |
| 271 if (!cts.IsCancellationRequested) | |
| 272 { | |
| 273 // If the network is available, execute the check. | |
| 274 // Otherwise, add it to the list of paused checks to be executed | |
| 275 // when the network becomes available again. | |
| 276 if (networkAvailable) | |
| 277 { | |
| 278 return await ExecuteCheckAsync(check, cts.Token); | |
| 279 } | |
| 280 else | |
| 281 { | |
| 282 if (!pausedChecks.Contains(check.Id)) | |
| 283 pausedChecks.Add(check.Id); | |
| 284 } | |
| 285 } | |
| 286 return await Task.FromResult(new CheckResult(check, CheckStatus.Disabled, null)); | |
| 287 } | |
| 288 | |
| 289 /// <summary>Executes a check asynchronously.</summary> | |
| 290 /// <param name="check">The check to execute.</param> | |
| 291 /// <param name="token">A chancellation token that may be used to cancel the check execution.</param> | |
| 292 /// <returns>The async check result.</returns> | |
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293 public async Task<CheckResult> ExecuteCheckAsync(Check check, CancellationToken token = default(CancellationToken)) |
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294 { |
| 17 | 295 // Update the status. |
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296 check.Status = CheckStatus.Running; |
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297 OnCheckStatusChanged(check); |
| 17 | 298 |
| 299 // Execute the check. | |
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300 CheckResult result = await check.ExecuteAsync(token); |
| 17 | 301 |
| 302 // Increment the consecutive failure counter on failue, or reset | |
| 303 // the counter on success. | |
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304 if (result.Failed) |
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305 check.ConsecutiveFailures++; |
| 17 | 306 else |
| 307 check.ConsecutiveFailures = 0; | |
| 308 | |
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309 OnCheckStatusChanged(check, result); |
| 4 | 310 HandleResultAsync(result); |
| 311 return result; | |
| 312 } | |
| 313 | |
| 17 | 314 /// <summary>Handles the result of a check execution.</summary> |
| 315 /// <param name="result">The result.</param> | |
| 4 | 316 private void HandleResultAsync(CheckResult result) |
| 317 { | |
| 17 | 318 // Log the result. |
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319 logger.Log(result); |
| 17 | 320 |
| 321 // Notify the user of failure according to user preferences. | |
| 322 // If the check succeeded, result.FailAction will be None. | |
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323 if (result.Check.ConsecutiveFailures >= result.Check.MaxConsecutiveFailures) |
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324 { |
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325 if (result.FailAction == FailAction.FlashTaskbar) |
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326 mainForm.AlertServerForm(result.Check); |
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327 if (result.FailAction.In(FailAction.FlashTaskbar, FailAction.NotificationBalloon)) |
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328 mainForm.ShowBalloon(result); |
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329 PlaySound(result.FailSound); |
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330 } |
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331 } |
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332 |
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333 /// <summary>Plays a sound.</summary> |
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334 /// <param name="sound"> |
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335 /// If null, no sound is played. |
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336 /// If string.Empty, the Windows default error sound is played. |
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337 /// Otherwise, plays the sound at the given path. |
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338 /// </param> |
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339 private void PlaySound(string sound) |
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340 { |
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341 if (sound == string.Empty) |
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342 SystemSounds.Asterisk.Play(); |
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343 else if (sound != null) |
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344 { |
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345 try |
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346 { |
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347 mediaReader = new MediaFoundationReader(sound); |
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348 waveOut.Init(mediaReader); |
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349 waveOut.PlaybackStopped += WaveOut_PlaybackStopped; |
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350 waveOut.Play(); |
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351 } |
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352 catch |
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353 { |
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354 // Play the default sound if something went wrong. |
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355 SystemSounds.Asterisk.Play(); |
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356 } |
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357 } |
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358 } |
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359 |
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360 /// <summary>Disposes the media reader after sound playback.</summary> |
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361 private void WaveOut_PlaybackStopped(object sender, StoppedEventArgs e) |
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362 { |
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363 mediaReader.Dispose(); |
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364 } |
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365 |
| 17 | 366 /// <summary>Reads all check results from the log for a server.</summary> |
| 367 /// <param name="server">The server whose check results should be read.</param> | |
| 368 /// <returns>A list of all check results found in the log file for the given server.</returns> | |
|
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369 public IList<CheckResult> GetLog(Server server) |
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370 { |
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371 return logger.Read(server); |
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372 } |
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373 |
| 17 | 374 /// <summary>Saves the check settings and notifies event subscribers when the status of a check changes.</summary> |
| 375 /// <param name="check">The check whose status has changed.</param> | |
| 376 /// <param name="result">The check result that caused the status to change, if any.</param> | |
|
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377 private void OnCheckStatusChanged(Check check, CheckResult result = null) |
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378 { |
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379 SaveServers(); |
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380 CheckStatusChanged?.Invoke(check, new CheckStatusChangedEventArgs(check, result)); |
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381 } |
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382 |
| 17 | 383 /// <summary>Handles user modifications to a check's settings.</summary> |
| 384 /// <param name="sender">The check that was modified.</param> | |
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385 private void Server_CheckModified(object sender, EventArgs e) |
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386 { |
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387 Check check = (Check)sender; |
| 17 | 388 |
| 389 // No need to mess with the task queue if not currently running. | |
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390 if (running) |
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391 { |
| 17 | 392 Task<CheckResult> task = tasks.FirstOrDefault(kvp => kvp.Value == check.Id).Key; |
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393 if (task == null) |
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394 { |
| 17 | 395 // No tasks associated with the check, so schedule a new one. |
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396 tasks.Add(ScheduleExecuteCheckAsync(check), check.Id); |
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397 } |
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398 else |
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399 { |
| 17 | 400 // Check was modified or deleted, so remove any waiting tasks. |
| 4 | 401 CancelCheck(check); |
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402 if (check.Server != null) |
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403 { |
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404 // If the check was not deleted, schedule the new check. |
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405 // But only if it's still running, otherwise restarting the monitor below |
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406 // will create a duplicate run. |
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407 if (running) |
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408 tasks.Add(ScheduleExecuteCheckAsync(check), check.Id); |
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409 } |
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410 } |
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411 } |
| 17 | 412 // Run again in case removing a task above caused it to stop. |
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413 Run(); |
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414 } |
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415 |
| 17 | 416 /// <summary>Handles the enabled state of a server changing.</summary> |
| 417 /// <param name="sender">The server that was enabled or disabled.</param> | |
| 4 | 418 private void Server_EnabledChanged(object sender, EventArgs e) |
| 419 { | |
| 420 Server server = (Server)sender; | |
| 17 | 421 |
| 422 // Make sure the monitor is running. If no servers were enabled before this | |
| 423 // one was enabled, it is not running. | |
| 4 | 424 if (server.Enabled) |
| 425 { | |
| 426 Run(); | |
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427 // Schedule all checks to run. |
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428 foreach (Check check in server.Checks) |
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429 { |
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430 Server_CheckModified(check, new EventArgs()); |
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431 } |
| 4 | 432 } |
| 433 else | |
| 434 { | |
| 17 | 435 // Cancel all queued and executing checks belonging to a |
| 436 // server that was disabled. | |
| 4 | 437 foreach (Check check in server.Checks) |
| 438 { | |
| 439 CancelCheck(check); | |
| 440 } | |
| 441 } | |
| 442 } | |
| 443 | |
| 17 | 444 /// <summary>Cancels a check that may be executing.</summary> |
| 445 /// <param name="check">The check to cancel.</param> | |
| 4 | 446 private void CancelCheck(Check check) |
| 447 { | |
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448 if (tasks == null) |
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449 return; |
| 17 | 450 |
| 451 // Find the waiting or executing task for the check and remove it. | |
| 4 | 452 Task<CheckResult> task = tasks.FirstOrDefault(kvp => kvp.Value == check.Id).Key; |
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453 if (task != null) |
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454 tasks.Remove(task); |
| 17 | 455 |
| 456 // Remove it from the list of paused checks so it doesn't get restarted later. | |
| 4 | 457 pausedChecks.RemoveAll(id => id == check.Id); |
| 17 | 458 |
| 459 // Cancel the current execution. | |
| 4 | 460 if (tokens.TryGetValue(check.Id, out CancellationTokenSource cts)) |
| 461 cts.Cancel(); | |
| 462 } | |
| 463 | |
| 17 | 464 /// <summary>Handles network state changing.</summary> |
| 4 | 465 private void NetworkChange_NetworkAddressChanged(object sender, EventArgs e) |
| 466 { | |
| 467 networkAvailable = Helpers.IsNetworkAvailable(); | |
| 17 | 468 // If the network is available, it might not have been before. |
| 469 // This method is not called from the correct thread, so special | |
| 470 // handling is needed to start it on the UI thread again. | |
| 4 | 471 if (networkAvailable) |
| 472 mainForm.Invoke((MethodInvoker)(() => Run())); | |
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473 } |
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474 |
| 17 | 475 /// <summary>Handles system power mode changes.</summary> |
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476 private async void SystemEvents_PowerModeChanged(object sender, PowerModeChangedEventArgs e) |
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477 { |
| 17 | 478 // If the system is being suspended, cancel all waiting and executing checks. |
| 479 // Once all the checks are removed, the main loop will exit. | |
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480 if (e.Mode == PowerModes.Suspend) |
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481 { |
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482 foreach (Check check in Checks) |
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483 { |
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484 CancelCheck(check); |
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485 } |
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486 suspend = true; |
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487 } |
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488 else if (e.Mode == PowerModes.Resume) |
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489 { |
| 17 | 490 // When resuming from suspend, examine each check to find out if it was |
| 491 // scheduled to be executed during the time period when the systems was | |
| 492 // suspended. Add them to the paused checks list, to be executed almost | |
| 493 // immediately. | |
| 494 // Make sure the list is empty to start. | |
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495 pausedChecks.Clear(); |
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496 foreach (Check check in Checks) |
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497 { |
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498 if (check.Enabled && check.Server.Enabled && check.NextRunTime < DateTime.Now) |
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499 { |
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500 pausedChecks.Add(check.Id); |
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501 } |
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502 } |
| 17 | 503 // Wait 10 seconds to give things time to quiet down after resuming. |
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504 await Task.Delay(10000); |
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505 suspend = false; |
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506 Run(); |
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507 } |
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508 } |
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509 |
| 17 | 510 /// <summary>Unregister system events when exiting.</summary> |
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511 private void Application_ApplicationExit(object sender, EventArgs e) |
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512 { |
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513 NetworkChange.NetworkAddressChanged -= NetworkChange_NetworkAddressChanged; |
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514 SystemEvents.PowerModeChanged -= SystemEvents_PowerModeChanged; |
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515 } |
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516 |
| 17 | 517 /// <summary>Attempts to read a private file.</summary> |
| 518 /// <param name="path">The path to the private key file.</param> | |
| 519 /// <param name="password">The password used to encrypt the key.</param> | |
| 520 /// <returns>A status indicating the result of the attempt.</returns> | |
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521 public KeyStatus OpenPrivateKey(string path, string password = null) |
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522 { |
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523 KeyStatus keyStatus; |
| 17 | 524 |
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525 if (path == null) |
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526 keyStatus = KeyStatus.NotAccessible; |
| 17 | 527 |
| 528 // Check if the key has already been open and read. | |
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529 if (privateKeys.TryGetValue(path, out PrivateKeyFile key) && key != null) |
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530 keyStatus = KeyStatus.Open; |
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531 else |
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532 { |
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533 try |
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534 { |
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535 key = new PrivateKeyFile(path, password); |
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536 keyStatus = KeyStatus.Open; |
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537 } |
| 17 | 538 // If the key is encrypted and the password is empty or incorrect, |
| 539 // return the NeedPassword status. | |
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540 catch (Exception e) when (e is SshPassPhraseNullOrEmptyException || e is InvalidOperationException) |
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541 { |
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542 keyStatus = KeyStatus.NeedPassword; |
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543 } |
| 17 | 544 // For any other failure reason, return the NotAccessible status. |
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545 catch (Exception) |
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546 { |
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547 keyStatus = KeyStatus.NotAccessible; |
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548 } |
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549 } |
| 17 | 550 // A single private key may be used by multiple servers. Update all servers |
| 551 // that use this private key with the results of the above operations. | |
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552 foreach (Server server in Servers) |
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553 { |
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554 if (server.KeyFile == path) |
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555 { |
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556 server.PrivateKeyFile = key; |
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557 server.KeyStatus = keyStatus; |
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558 } |
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559 } |
| 17 | 560 // Keep a reference to this private key so we don't have to re-open |
| 561 // it later if the same key is used on a different server. | |
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562 privateKeys[path] = key; |
| 17 | 563 |
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564 return keyStatus; |
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565 } |
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566 |
| 17 | 567 /// <summary>Generates internal IDs for servers and checks.</summary> |
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568 private void GenerateIds() |
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569 { |
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570 if (Servers.Any()) |
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571 { |
| 17 | 572 // Start at the maximum ID to make sure IDs are not reused |
| 573 // if a server was deleted so old log entries do not get associated | |
| 574 // with a new server. | |
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575 int id = Servers.Max(s => s.Id); |
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576 foreach (Server server in Servers) |
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577 { |
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578 if (server.Id == 0) |
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579 server.Id = ++id; |
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580 } |
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581 } |
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582 |
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583 if (Checks.Any()) |
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584 { |
| 17 | 585 // Start with the max check ID, same reasons as above. |
| 586 // Is there a reason this is stored in a setting? | |
| 4 | 587 int id = Math.Max(Settings.Default.MaxCheckId, Checks.Max(c => c.Id)); |
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588 foreach (Check check in Checks) |
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589 { |
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590 if (check.Id == 0) |
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591 check.Id = ++id; |
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592 } |
| 4 | 593 Settings.Default.MaxCheckId = id; |
| 594 Settings.Default.Save(); | |
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595 } |
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596 } |
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597 |
| 17 | 598 /// <summary>Creates an XML serializer that can handle servers and all check types.</summary> |
| 599 /// <returns>An XML serializer that can handle servers and all check types.</returns> | |
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600 private XmlSerializer CreateXmlSerializer() |
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601 { |
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602 return new XmlSerializer(typeof(List<Server>), Check.CheckTypes); |
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603 } |
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604 } |
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605 |
| 17 | 606 /// <summary>Event arguments for when a check status changes.</summary> |
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607 public class CheckStatusChangedEventArgs : EventArgs |
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608 { |
| 17 | 609 /// <summary>The check whose status changed.</summary> |
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610 public Check Check { get; private set; } |
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611 |
| 17 | 612 /// <summary>The check result that caused the status to change, if any.</summary> |
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613 public CheckResult CheckResult { get; private set; } |
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614 |
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615 public CheckStatusChangedEventArgs(Check check, CheckResult result) |
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616 { |
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617 Check = check; |
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618 CheckResult = result; |
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619 } |
| 4 | 620 } |
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621 |
| 17 | 622 /// <summary>Possible actions that may be taken when a check fails.</summary> |
| 623 public enum FailAction | |
| 624 { | |
| 625 /// <summary>Flashes the Server Monitor tasbar program icon.</summary> | |
| 626 FlashTaskbar = 0, | |
| 627 /// <summary>Shows a balloon in the notification area.</summary> | |
| 628 NotificationBalloon = 1, | |
| 629 /// <summary>Take no action.</summary> | |
| 630 None = 10 | |
| 631 } | |
| 632 | |
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633 } |