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FileLogListener.cs
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FileLogListener.cs
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// --------------------------------------------------------------------------------------------------------------------
// <copyright file="FileLogListener.cs" company="Catel development team">
// Copyright (c) 2008 - 2014 Catel development team. All rights reserved.
// </copyright>
// --------------------------------------------------------------------------------------------------------------------
#if NET
namespace Catel.Logging
{
using System;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Reflection;
using Reflection;
using System.Threading.Tasks;
/// <summary>
/// Log listener which writes all data to a file.
/// </summary>
public class FileLogListener : BatchLogListenerBase
{
private const string AppData = "{AppData}";
private const string AppDir = "{AppDir}";
private const string Date = "{Date}";
private const string Time = "{Time}";
private const string AssemblyName = "{AssemblyName}";
private const string ProcessId = "{ProcessId}";
private const string AutoLogFileName = "{AutoLogFileName}";
private readonly string AutoLogFileNameReplacement = string.Format("{0}_{1}_{2}_{3}", AssemblyName, Date, Time, ProcessId);
private readonly Assembly _assembly;
private string _filePath;
#region Constructors
/// <summary>
/// Initializes a new instance of the <see cref="FileLogListener" /> class.
/// </summary>
/// <param name="assembly">The assembly to load the product info from. If <c>null</c>, the entry assembly will be used.</param>
public FileLogListener(Assembly assembly = null)
{
MaxSizeInKiloBytes = 1000 * 10; // 10 MB
_assembly = assembly ?? AssemblyHelper.GetEntryAssembly() ?? Assembly.GetCallingAssembly();
if (string.IsNullOrWhiteSpace(_filePath))
{
_filePath = DetermineFilePath(AutoLogFileName);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="FileLogListener" /> class.
/// </summary>
/// <param name="filePath">The file path.</param>
/// <param name="maxSizeInKiloBytes">The max size in kilo bytes.</param>
/// <param name="assembly">The assembly to load the product info from. If <c>null</c>, the entry assembly will be used.</param>
/// <exception cref="ArgumentException">The <paramref name="filePath" /> is <c>null</c> or whitespace.</exception>
public FileLogListener(string filePath, int maxSizeInKiloBytes, Assembly assembly = null)
: this(assembly)
{
Argument.IsNotNullOrWhitespace(() => filePath);
FilePath = filePath;
MaxSizeInKiloBytes = maxSizeInKiloBytes;
}
#endregion
#region Properties
/// <summary>
/// Gets or sets the file path.
/// </summary>
/// <value>The file path.</value>
public string FilePath
{
get { return _filePath; }
set { _filePath = DetermineFilePath(value); }
}
/// <summary>
/// Gets or sets the maximum size information kilo bytes.
/// </summary>
/// <value>The maximum size information kilo bytes.</value>
public int MaxSizeInKiloBytes { get; set; }
#endregion
#region Methods
/// <summary>
/// Writes the batch of entries.
/// </summary>
/// <param name="batchEntries">The batch entries.</param>
protected override async Task WriteBatch(System.Collections.Generic.List<LogBatchEntry> batchEntries)
{
try
{
var filePath = FilePath;
var directoryName = Path.GetDirectoryName(filePath);
if (!string.IsNullOrWhiteSpace(directoryName))
{
Directory.CreateDirectory(directoryName);
}
var fileInfo = new FileInfo(filePath);
if (fileInfo.Exists && (fileInfo.Length / 1024 >= MaxSizeInKiloBytes))
{
await CreateCopyOfCurrentLogFile(FilePath);
}
using (var fileStream = new FileStream(filePath, FileMode.Append, FileAccess.Write, FileShare.Read))
{
using (var writer = new StreamWriter(fileStream))
{
foreach (var batchEntry in batchEntries)
{
var message = FormatLogEvent(batchEntry.Log, batchEntry.Message, batchEntry.LogEvent, batchEntry.ExtraData, batchEntry.Time);
await writer.WriteLineAsync(message);
}
await writer.FlushAsync();
}
}
}
catch (Exception)
{
// Swallow
}
}
private async Task CreateCopyOfCurrentLogFile(string filePath)
{
await Task.Factory.StartNew(() =>
{
for (int i = 1; i < 999; i++)
{
var possibleFilePath = string.Format("{0}.{1:000}", filePath, i);
if (!File.Exists(possibleFilePath))
{
File.Move(filePath, possibleFilePath);
}
}
});
}
private string DetermineFilePath(string filePath)
{
if (string.IsNullOrWhiteSpace(filePath))
{
filePath = string.Empty;
}
if (filePath.Contains(AutoLogFileName))
{
filePath = filePath.Replace(AutoLogFileName, AutoLogFileNameReplacement);
}
string dataDirectory;
if (_assembly != null)
{
dataDirectory = IO.Path.GetApplicationDataDirectory(_assembly.Company(), _assembly.Product());
}
else
{
dataDirectory = IO.Path.GetApplicationDataDirectory();
}
if (filePath.Contains(AssemblyName))
{
filePath = filePath.Replace(AssemblyName, _assembly.GetName().Name);
}
if (filePath.Contains(ProcessId))
{
filePath = filePath.Replace(ProcessId, Process.GetCurrentProcess().Id.ToString());
}
if (filePath.Contains(Date))
{
filePath = filePath.Replace(Date, DateTime.Now.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture));
}
if (filePath.Contains(Time))
{
filePath = filePath.Replace(Time, DateTime.Now.ToString("HHmmss", CultureInfo.InvariantCulture));
}
if (filePath.Contains(AppData))
{
filePath = filePath.Replace(AppData, dataDirectory);
}
if (filePath.Contains(AppDir))
{
filePath = filePath.Replace(AppDir, AppDomain.CurrentDomain.BaseDirectory);
}
filePath = IO.Path.GetFullPath(filePath, dataDirectory);
if (!filePath.EndsWith(".log"))
{
filePath += ".log";
}
return filePath;
}
#endregion
}
}
#endif