Mercurial > servermonitor

annotate ServerMonitor/Objects/Logger.cs @ 34:9c0e18d65e8b

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Build NuGet from source instead of using the NuGet package to fix the update notification always showing when the program is run from Windows startup.
author Brad Greco <brad@bgreco.net>
date Sat, 13 Jul 2019 12:09:10 -0400
parents 68d7834dc28e
children
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rev   line source
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1 using ServerMonitorApp.Properties;
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2 using System;
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3 using System.Collections.Generic;
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4 using System.IO;
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5 using System.Linq;
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6 using System.Text;
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7
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8 namespace ServerMonitorApp
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9 {
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10 /// <summary>Manages reading and writing check results to a log file.</summary>
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11 public class Logger
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12 {
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13 private const int logVersion = 1;
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14 private readonly string logFile;
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15
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16 /// <summary>Logger constructor.</summary>
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17 /// <param name="file">The path of the log file to use.</param>
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18 public Logger(string file)
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19 {
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20 logFile = file;
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21 }
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22
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23 /// <summary>Appends a string to the log file, creating the log file if it does not exist.</summary>
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24 /// <param name="logString">The string to log.</param>
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25 public async void Log(string logString)
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26 {
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27 // Create the file if it does not exist.
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28 // Write the current version at the beginning in case we ever change the format.
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29 if (!File.Exists(logFile))
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30 logString = "Server Monitor log version " + logVersion + Environment.NewLine + logString;
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31 // Write the message.
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32 using (FileStream stream = new FileStream(logFile, FileMode.Append, FileAccess.Write, FileShare.Read, 4096, true))
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33 using (StreamWriter writer = new StreamWriter(stream, Encoding.UTF8))
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34 {
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35 await writer.WriteLineAsync(logString);
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36 }
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37 }
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38
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39 /// <summary>Appends a check result to the log file, creating the log file if it does not exist.</summary>
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40 /// <param name="result">The check result to log.</param>
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41 public void Log(CheckResult result)
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42 {
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43 Log(result.ToLogString());
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44 }
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45
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46 /// <summary>Reads all check results from the log for a server.</summary>
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47 /// <param name="server">The server whose check results should be read.</param>
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48 /// <returns>A list of all check results found in the log file for the given server.</returns>
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49 public IList<CheckResult> Read(Server server)
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50 {
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51 // Store the checks by ID.
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52 Dictionary<int, Check> checks = server.Checks.ToDictionary(c => c.Id);
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53 List<CheckResult> results = new List<CheckResult>();
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54 using (FileStream stream = new FileStream(logFile, FileMode.Open, FileAccess.Read, FileShare.Read))
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55 using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
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56 {
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57 // Read through the whole file, searching for results belonging to the server.
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58 while (true)
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59 {
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60 try
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61 {
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62 string line = reader.ReadLine();
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63 // Exit the loop when we reach the end.
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64 if (line == null)
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65 break;
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66 // The check ID is a fixed length.
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67 // Parse it and see if it matches any of the checks we are interested in.
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68 if (int.TryParse(line.Substring(0, 5), out int id) && checks.TryGetValue(id, out Check check))
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69 {
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70 // If it is, add it to our results list.
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71 results.Add(CheckResult.FromLogString(check, line));
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72 }
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73 }
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74 // Don't know why this catch block is empty.
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75 // Maybe to ignore errors if the file does not exist?
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76 catch (Exception) { }
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77 }
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78 }
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79 // Return the newest results first since that's how they are displayed.
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80 results.Reverse();
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81 return results;
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82 }
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83
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84 /// <summary>Removes old entries from the log.</summary>
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85 public async void TrimLog()
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86 {
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87 // Delete entries older than this date.
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88 DateTime maxAge = DateTime.Now.AddDays(-1 * Settings.Default.KeepLogDays);
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89 string tempFile = logFile + ".tmp";
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90 try
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91 {
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92 // Read through the log file and check the date of each entry.
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93 // If it is newer than the max age, copy it to a temporary file.
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94 using (FileStream stream = new FileStream(logFile, FileMode.Open, FileAccess.Read, FileShare.Read))
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95 using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
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96 using (FileStream outStream = new FileStream(tempFile, FileMode.Create, FileAccess.Write, FileShare.None))
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97 using (StreamWriter writer = new StreamWriter(outStream, Encoding.UTF8))
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98 {
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99 while (true)
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100 {
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101 try
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102 {
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103 string line = reader.ReadLine();
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104 if (line == null)
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105 break;
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106 if (DateTime.TryParse(line.Substring(6, 10), out DateTime date) && date > maxAge)
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107 {
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108 await writer.WriteLineAsync(line);
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109 }
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110 }
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111 catch (Exception) { }
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112 }
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113 }
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114 // Delete the original file and rename the temporary file that contains only recent entries.
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115 File.Delete(logFile);
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116 File.Move(tempFile, logFile);
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117 }
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118 catch (FileNotFoundException)
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119 {
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120 // Do nothing if the log file does not exist yet.
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121 }
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122 }
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123 }
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124 }