Mercurial > servermonitor

annotate ServerMonitor/Objects/Logger.cs @ 14:2db36ab759de

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author Brad Greco <brad@bgreco.net>
date Mon, 22 Apr 2019 21:10:42 -0400
parents 7127d5b5ac75
children 68d7834dc28e
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1 using ServerMonitorApp.Properties;
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2 using System;
0
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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.Reflection;
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7 using System.Text;
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8 using System.Threading.Tasks;
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9
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10 namespace ServerMonitorApp
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11 {
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12 public class Logger
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13 {
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14 private const int logVersion = 1;
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15 private readonly string logFile;
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16
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17 public Logger(string file)
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18 {
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19 logFile = file;
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20 }
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21
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22 public async void Log(string logString)
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23 {
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24 if (!File.Exists(logFile))
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25 logString = "Server Monitor log version " + logVersion + Environment.NewLine + logString;
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26 using (FileStream stream = new FileStream(logFile, FileMode.Append, FileAccess.Write, FileShare.Read, 4096, true))
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27 using (StreamWriter writer = new StreamWriter(stream, Encoding.UTF8))
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28 {
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29 await writer.WriteLineAsync(logString);
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30 }
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31 }
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32
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33 public void Log(CheckResult result)
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34 {
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35 Log(result.ToLogString());
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36 }
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37
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38 public IList<CheckResult> Read(Server server)
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39 {
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40 Dictionary<int, Check> checks = server.Checks.ToDictionary(c => c.Id);
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41 List<CheckResult> results = new List<CheckResult>();
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42 using (FileStream stream = new FileStream(logFile, FileMode.Open, FileAccess.Read, FileShare.Read))
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43 using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
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44 {
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45 while (true)
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46 {
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47 try
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48 {
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49 string line = reader.ReadLine();
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50 if (line == null)
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51 break;
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52 if (int.TryParse(line.Substring(0, 5), out int id) && checks.TryGetValue(id, out Check check))
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53 {
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54 results.Add(CheckResult.FromLogString(check, line));
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55 }
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56 }
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57 catch (Exception) { }
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58 }
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59 }
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60 results.Reverse();
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61 return results;
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62 }
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63
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64 public async void TrimLog()
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65 {
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66 DateTime maxAge = DateTime.Now.AddDays(-1 * Settings.Default.KeepLogDays);
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67 string tempFile = logFile + ".tmp";
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68 try
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69 {
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70 using (FileStream stream = new FileStream(logFile, FileMode.Open, FileAccess.Read, FileShare.Read))
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71 using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
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72 using (FileStream outStream = new FileStream(tempFile, FileMode.Create, FileAccess.Write, FileShare.None))
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73 using (StreamWriter writer = new StreamWriter(outStream, Encoding.UTF8))
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74 {
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75 while (true)
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76 {
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77 try
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78 {
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79 string line = reader.ReadLine();
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80 if (line == null)
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81 break;
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82 if (DateTime.TryParse(line.Substring(6, 10), out DateTime date) && date > maxAge)
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83 {
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84 await writer.WriteLineAsync(line);
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85 }
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86 }
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87 catch (Exception) { }
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88 }
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89 }
9
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90 File.Delete(logFile);
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91 File.Move(tempFile, logFile);
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92 }
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93 catch (FileNotFoundException)
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94 {
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95 // Do nothing if the log file does not exist yet.
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96 }
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97 }
0
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98 }
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99 }