Mercurial > servermonitor

annotate ServerMonitor/Objects/ServerMonitor.cs @ 35:2ffb0bda7705

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Increase wait time after system resume to begin running checks to prevent false positives.
author Brad Greco <brad@bgreco.net>
date Sat, 13 Jul 2019 12:18:21 -0400
parents f6235dc0a8ec
children 10e60b05c7ec
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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diff changeset
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;
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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;
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11 using System.Net.NetworkInformation;
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12 using System.Threading;
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13 using System.Threading.Tasks;
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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 {
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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;
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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>();
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26 // SSH private keys, keyed by the path to the private key file.
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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>();
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29 // IDs of all checks that have been paused due to network unavailability,
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30 // or due to the system being suspended.
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31 // Not to be confused with checks that have been disabled by the user.
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32 private readonly List<int> pausedChecks = new List<int>();
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33 private bool running, networkAvailable, suspend;
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34 // List of check execution tasks that have been started.
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35 // A check task begins by sleeping until the next scheduled execution time,
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36 // then executes.
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37 private Dictionary<Task<CheckResult>, int> tasks;
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38 private ServerSummaryForm mainForm;
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39 private WaveOut waveOut = new WaveOut();
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40 MediaFoundationReader mediaReader;
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41
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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
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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
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48 /// <summary>A collection of all checks belonging to all registerd servers.</summary>
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49 public IEnumerable<Check> Checks => Servers.SelectMany(s => s.Checks);
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50
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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
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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
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57 /// <summary>ServerMonitor constructor.</summary>
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58 /// <param name="mainForm">A reference to the main form.</param>
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59 public ServerMonitor(ServerSummaryForm mainForm)
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60 {
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61 this.mainForm = mainForm;
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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
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68 /// <summary>Registers a new server with the server monitor.</summary>
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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);
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73 SaveServers();
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74 server.CheckModified += Server_CheckModified;
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75 server.EnabledChanged += Server_EnabledChanged;
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76 }
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77
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78 /// <summary>Deletes a server from the server monitor.</summary>
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79 /// <param name="server">The server to be deleted.</param>
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80 public void DeleteServer(Server server)
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81 {
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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 }
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89 SaveServers();
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90 }
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91
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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 {
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95 bool triedBackup = false;
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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));
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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 {
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108 // Read private keys into memory if they are accessible and not encrypted.
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109 // If PrivateKeyFile != null, it means same the key has already been loaded for
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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 {
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115 // Update the checks so they know what server they belong to.
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116 // Would rather do this in the Server object on deserialization, but
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117 // that doesn't work when using the XML serializer for some reason.
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118 check.Server = server;
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119 // If the program last exited while the check was running, change its status
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120 // to the result of its last execution (since, at this point, the check is
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121 // not running).
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122 if (check.Status == CheckStatus.Running)
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123 check.Status = check.LastRunStatus;
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124 }
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125 server.CheckModified += Server_CheckModified;
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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();
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135 // If there was an error parsing the XML, try again with the backup config file.
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136 if (!triedBackup)
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137 {
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138 File.Copy(ConfigFile, ConfigFile + ".error", true);
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139 string backupConfig = ConfigFile + ".bak";
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140 if (File.Exists(backupConfig))
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141 {
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142 File.Copy(backupConfig, ConfigFile, true);
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143 }
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144 triedBackup = true;
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145 goto Read;
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146 }
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147 else
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148 {
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149 // If there was an error reading the backup file too, give up.
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150 throw;
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151 }
0
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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;
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158 NetworkChange.NetworkAddressChanged += NetworkChange_NetworkAddressChanged;
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159 SystemEvents.PowerModeChanged += SystemEvents_PowerModeChanged;
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diff changeset
160
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161 // Remove old entries from the log file according to user preferences.
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162 logger.TrimLog();
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163
0
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164 Run();
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165 }
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166
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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
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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 {
0
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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 {
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187 // If the directory does not exist, create it and try again.
0
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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
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199 /// <summary>Main server monitor loop. Schedules and executes checks.</summary>
0
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200 private async void Run()
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201 {
17
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202 // Do not run again if already running or if the system is suspending or resuming.
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203 if (running || suspend)
0
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204 return;
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205
0
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206 running = true;
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207
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208 // If the network is available, immediately execute checks that were supposed to run
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209 // earlier but could not due to network unavailability or the system being suspended.
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210 networkAvailable = Helpers.IsNetworkAvailable();
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211 if (networkAvailable)
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212 {
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213 foreach (int id in pausedChecks)
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214 {
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215 await ExecuteCheckAsync(Checks.FirstOrDefault(c => c.Id == id));
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216 }
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217 pausedChecks.Clear();
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218 }
17
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diff changeset
219
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220 // Schedule all checks to run according to their schedules.
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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
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diff changeset
225 // When any check is done sleeping and executing, remove the completed
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226 // task and queue a new task to schedule it again.
0
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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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diff changeset
229 try
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230 {
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231 CheckResult result = await task;
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diff changeset
232 // Do not schedule the task again if it is now disabled.
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diff changeset
233 // Result will be null if a scheduled check was disabled.
0
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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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diff changeset
237 catch (OperationCanceledException)
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238 {
17
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diff changeset
239 // When a server's state changes to Disabled, any checks that are executing
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diff changeset
240 // are immediately cancelled. Silently catch these expected exceptions.
0
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241 }
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242 }
17
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diff changeset
243 // If there are no enabled checks scheduled, exit the main loop.
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diff changeset
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
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diff changeset
248 /// <summary>Schedules a check to be run on its schedule.</summary>
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diff changeset
249 /// <param name="check">The check to execute.</param>
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diff changeset
250 /// <returns>The async check result.</returns>
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diff changeset
251 private async Task<CheckResult> ScheduleExecuteCheckAsync(Check check)
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diff changeset
252 {
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diff changeset
253 // Do not schedule or execute the check if it or its server is disabled.
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diff changeset
254 if (!check.Enabled || !check.Server.Enabled)
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diff changeset
255 return await Task.FromResult(new CheckResult(check, CheckStatus.Disabled, null));
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diff changeset
256
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diff changeset
257 // Create a cancellation token that will be used to cancel the check if it or
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parents: 8
diff changeset
258 // its server is disabled while it is executing.
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diff changeset
259 CancellationTokenSource cts = new CancellationTokenSource();
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diff changeset
260 tokens[check.Id] = cts;
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diff changeset
261
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diff changeset
262 // Sleep until next time the check is supposed to be executed.
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parents: 8
diff changeset
263 // Use the LastScheduledRunTime so manual executions by the user do not
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parents: 8
diff changeset
264 // interfere with the schedule.
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diff changeset
265 check.NextRunTime = check.Schedule.GetNextTime(check.LastScheduledRunTime);
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diff changeset
266 int delay = Math.Max(0, (int)(check.NextRunTime - DateTime.Now).TotalMilliseconds);
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diff changeset
267 await Task.Delay(delay, cts.Token);
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diff changeset
268 check.LastScheduledRunTime = check.NextRunTime;
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diff changeset
269
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diff changeset
270 // Execute the check if not cancelled.
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diff changeset
271 if (!cts.IsCancellationRequested)
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Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
272 {
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diff changeset
273 // If the network is available, execute the check.
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diff changeset
274 // Otherwise, add it to the list of paused checks to be executed
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diff changeset
275 // when the network becomes available again.
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diff changeset
276 if (networkAvailable)
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diff changeset
277 {
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diff changeset
278 return await ExecuteCheckAsync(check, cts.Token);
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diff changeset
279 }
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diff changeset
280 else
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diff changeset
281 {
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diff changeset
282 if (!pausedChecks.Contains(check.Id))
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283 pausedChecks.Add(check.Id);
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diff changeset
284 }
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diff changeset
285 }
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286 return await Task.FromResult(new CheckResult(check, CheckStatus.Disabled, null));
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diff changeset
287 }
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diff changeset
288
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diff changeset
289 /// <summary>Executes a check asynchronously.</summary>
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diff changeset
290 /// <param name="check">The check to execute.</param>
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291 /// <param name="token">A chancellation token that may be used to cancel the check execution.</param>
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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 {
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295 // Update the status.
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296 check.Status = CheckStatus.Running;
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297 OnCheckStatusChanged(check);
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298
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299 // Execute the check.
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300 CheckResult result = await check.ExecuteAsync(token);
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301
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302 // Increment the consecutive failure counter on failue, or reset
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303 // the counter on success.
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304 if (result.Failed)
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305 check.ConsecutiveFailures++;
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306 else
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307 check.ConsecutiveFailures = 0;
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308
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309 OnCheckStatusChanged(check, result);
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310 HandleResultAsync(result);
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311 return result;
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312 }
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313
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314 /// <summary>Handles the result of a check execution.</summary>
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315 /// <param name="result">The result.</param>
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316 private void HandleResultAsync(CheckResult result)
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317 {
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318 // Log the result.
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319 logger.Log(result);
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320
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321 // Notify the user of failure according to user preferences.
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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
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366 /// <summary>Reads all check results from the log for a server.</summary>
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367 /// <param name="server">The server whose check results should be read.</param>
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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
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374 /// <summary>Saves the check settings and notifies event subscribers when the status of a check changes.</summary>
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375 /// <param name="check">The check whose status has changed.</param>
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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
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383 /// <summary>Handles user modifications to a check's settings.</summary>
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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;
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388
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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 {
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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 {
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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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diff changeset
398 else
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399 {
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diff changeset
400 // Check was modified or deleted, so remove any waiting tasks.
4
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401 CancelCheck(check);
0
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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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diff changeset
407 if (running)
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408 tasks.Add(ScheduleExecuteCheckAsync(check), check.Id);
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409 }
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parents:
diff changeset
410 }
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411 }
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diff changeset
412 // Run again in case removing a task above caused it to stop.
0
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diff changeset
413 Run();
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diff changeset
414 }
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diff changeset
415
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diff changeset
416 /// <summary>Handles the enabled state of a server changing.</summary>
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diff changeset
417 /// <param name="sender">The server that was enabled or disabled.</param>
4
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diff changeset
418 private void Server_EnabledChanged(object sender, EventArgs e)
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parents: 0
diff changeset
419 {
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420 Server server = (Server)sender;
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diff changeset
421
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diff changeset
422 // Make sure the monitor is running. If no servers were enabled before this
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diff changeset
423 // one was enabled, it is not running.
4
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424 if (server.Enabled)
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425 {
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426 Run();
25
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diff changeset
427 // Schedule all checks to run.
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diff changeset
428 foreach (Check check in server.Checks)
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diff changeset
429 {
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diff changeset
430 Server_CheckModified(check, new EventArgs());
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diff changeset
431 }
4
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parents: 0
diff changeset
432 }
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diff changeset
433 else
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434 {
17
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parents: 8
diff changeset
435 // Cancel all queued and executing checks belonging to a
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parents: 8
diff changeset
436 // server that was disabled.
4
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437 foreach (Check check in server.Checks)
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parents: 0
diff changeset
438 {
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parents: 0
diff changeset
439 CancelCheck(check);
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
440 }
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
441 }
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
442 }
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
443
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
444 /// <summary>Cancels a check that may be executing.</summary>
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
445 /// <param name="check">The check to cancel.</param>
4
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
446 private void CancelCheck(Check check)
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
447 {
6
c1dffaac66fa - Don't show multiple password dialogs for the same key if the first one was cancelled.
Brad Greco <brad@bgreco.net>
parents: 5
diff changeset
448 if (tasks == null)
c1dffaac66fa - Don't show multiple password dialogs for the same key if the first one was cancelled.
Brad Greco <brad@bgreco.net>
parents: 5
diff changeset
449 return;
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
450
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
451 // Find the waiting or executing task for the check and remove it.
4
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
452 Task<CheckResult> task = tasks.FirstOrDefault(kvp => kvp.Value == check.Id).Key;
5
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
453 if (task != null)
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
454 tasks.Remove(task);
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
455
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
456 // Remove it from the list of paused checks so it doesn't get restarted later.
4
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
457 pausedChecks.RemoveAll(id => id == check.Id);
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
458
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
459 // Cancel the current execution.
4
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
460 if (tokens.TryGetValue(check.Id, out CancellationTokenSource cts))
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
461 cts.Cancel();
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
462 }
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
463
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
464 /// <summary>Handles network state changing.</summary>
4
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
465 private void NetworkChange_NetworkAddressChanged(object sender, EventArgs e)
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
466 {
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
467 networkAvailable = Helpers.IsNetworkAvailable();
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
468 // If the network is available, it might not have been before.
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
469 // This method is not called from the correct thread, so special
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
470 // handling is needed to start it on the UI thread again.
4
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
471 if (networkAvailable)
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
472 mainForm.Invoke((MethodInvoker)(() => Run()));
0
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
473 }
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
474
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
475 /// <summary>Handles system power mode changes.</summary>
8
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
476 private async void SystemEvents_PowerModeChanged(object sender, PowerModeChangedEventArgs e)
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
477 {
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
478 // If the system is being suspended, cancel all waiting and executing checks.
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
479 // Once all the checks are removed, the main loop will exit.
8
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
480 if (e.Mode == PowerModes.Suspend)
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
481 {
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
482 foreach (Check check in Checks)
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
483 {
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
484 CancelCheck(check);
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
485 }
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
486 suspend = true;
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
487 }
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
488 else if (e.Mode == PowerModes.Resume)
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
489 {
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
490 // When resuming from suspend, examine each check to find out if it was
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
491 // scheduled to be executed during the time period when the systems was
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
492 // suspended. Add them to the paused checks list, to be executed almost
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
493 // immediately.
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
494 // Make sure the list is empty to start.
8
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
495 pausedChecks.Clear();
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
496 foreach (Check check in Checks)
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
497 {
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
498 if (check.Enabled && check.Server.Enabled && check.NextRunTime < DateTime.Now)
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
499 {
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
500 pausedChecks.Add(check.Id);
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
501 }
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
502 }
35
2ffb0bda7705 Increase wait time after system resume to begin running checks to prevent false positives.
Brad Greco <brad@bgreco.net>
parents: 29
diff changeset
503 // Wait 20 seconds to give things time to quiet down after resuming.
2ffb0bda7705 Increase wait time after system resume to begin running checks to prevent false positives.
Brad Greco <brad@bgreco.net>
parents: 29
diff changeset
504 await Task.Delay(20000);
8
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
505 suspend = false;
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
506 Run();
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
507 }
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
508 }
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
509
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
510 /// <summary>Unregister system events when exiting.</summary>
8
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
511 private void Application_ApplicationExit(object sender, EventArgs e)
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
512 {
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
513 NetworkChange.NetworkAddressChanged -= NetworkChange_NetworkAddressChanged;
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
514 SystemEvents.PowerModeChanged -= SystemEvents_PowerModeChanged;
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
515 }
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
516
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
517 /// <summary>Attempts to read a private file.</summary>
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
518 /// <param name="path">The path to the private key file.</param>
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
519 /// <param name="password">The password used to encrypt the key.</param>
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
520 /// <returns>A status indicating the result of the attempt.</returns>
5
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
521 public KeyStatus OpenPrivateKey(string path, string password = null)
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
522 {
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
523 KeyStatus keyStatus;
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
524
5
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
525 if (path == null)
8
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
526 keyStatus = KeyStatus.NotAccessible;
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
527
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
528 // Check if the key has already been open and read.
5
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
529 if (privateKeys.TryGetValue(path, out PrivateKeyFile key) && key != null)
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
530 keyStatus = KeyStatus.Open;
8
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
531 else
5
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
532 {
8
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
533 try
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
534 {
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
535 key = new PrivateKeyFile(path, password);
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
536 keyStatus = KeyStatus.Open;
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
537 }
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
538 // If the key is encrypted and the password is empty or incorrect,
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
539 // return the NeedPassword status.
8
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
540 catch (Exception e) when (e is SshPassPhraseNullOrEmptyException || e is InvalidOperationException)
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
541 {
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
542 keyStatus = KeyStatus.NeedPassword;
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
543 }
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
544 // For any other failure reason, return the NotAccessible status.
8
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
545 catch (Exception)
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
546 {
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
547 keyStatus = KeyStatus.NotAccessible;
052aa62cb42a Single instance. Add autorun option. Add icons. General enhancements.
Brad Greco <brad@bgreco.net>
parents: 6
diff changeset
548 }
5
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
549 }
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
550 // A single private key may be used by multiple servers. Update all servers
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
551 // that use this private key with the results of the above operations.
5
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
552 foreach (Server server in Servers)
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
553 {
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
554 if (server.KeyFile == path)
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
555 {
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
556 server.PrivateKeyFile = key;
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
557 server.KeyStatus = keyStatus;
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
558 }
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
559 }
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
560 // Keep a reference to this private key so we don't have to re-open
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
561 // it later if the same key is used on a different server.
5
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
562 privateKeys[path] = key;
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
563
5
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
564 return keyStatus;
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
565 }
b6fe203af9d5 Private key passwords and validation
Brad Greco <brad@bgreco.net>
parents: 4
diff changeset
566
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
567 /// <summary>Generates internal IDs for servers and checks.</summary>
0
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
568 private void GenerateIds()
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
569 {
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
570 if (Servers.Any())
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
571 {
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
572 // Start at the maximum ID to make sure IDs are not reused
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
573 // if a server was deleted so old log entries do not get associated
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
574 // with a new server.
0
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
575 int id = Servers.Max(s => s.Id);
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
576 foreach (Server server in Servers)
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
577 {
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
578 if (server.Id == 0)
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
579 server.Id = ++id;
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
580 }
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
581 }
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
582
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
583 if (Checks.Any())
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
584 {
17
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
585 // Start with the max check ID, same reasons as above.
68d7834dc28e More comments.
Brad Greco <brad@bgreco.net>
parents: 8
diff changeset
586 // Is there a reason this is stored in a setting?
4
3142e52cbe69 Lots more progress
Brad Greco <brad@bgreco.net>
parents: 0
diff changeset
587 int id = Math.Max(Settings.Default.MaxCheckId, Checks.Max(c => c.Id));
0
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
588 foreach (Check check in Checks)
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
589 {
3e1a2131f897 Initial commit. Ping check, scheduling, UI working. SSH check mostly working.
Brad Greco <brad@bgreco.net>
parents:
diff changeset
590 if (check.Id == 0)
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591 check.Id = ++id;
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592 }
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593 Settings.Default.MaxCheckId = id;
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594 Settings.Default.Save();
0
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595 }
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596 }
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597
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598 /// <summary>Creates an XML serializer that can handle servers and all check types.</summary>
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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
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606 /// <summary>Event arguments for when a check status changes.</summary>
0
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607 public class CheckStatusChangedEventArgs : EventArgs
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608 {
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609 /// <summary>The check whose status changed.</summary>
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610 public Check Check { get; private set; }
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611
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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 }
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620 }
0
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621
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622 /// <summary>Possible actions that may be taken when a check fails.</summary>
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623 public enum FailAction
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624 {
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625 /// <summary>Flashes the Server Monitor tasbar program icon.</summary>
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626 FlashTaskbar = 0,
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627 /// <summary>Shows a balloon in the notification area.</summary>
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628 NotificationBalloon = 1,
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629 /// <summary>Take no action.</summary>
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630 None = 10
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631 }
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632
0
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633 }