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Log.cs
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Log.cs
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#region Copyright & License Information
/*
* Copyright (c) The OpenRA Developers and Contributors
* This file is part of OpenRA, which is free software. It is made
* available to you under the terms of the GNU General Public License
* as published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version. For more
* information, see COPYING.
*/
#endregion
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Threading;
using System.Threading.Channels;
namespace OpenRA
{
public struct ChannelInfo
{
public string Filename;
public bool IsTimestamped;
public TextWriter Writer;
}
readonly struct ChannelData
{
public readonly string Channel;
public readonly string Text;
public ChannelData(string channel, string text)
{
Text = text;
Channel = channel;
}
}
public static class Log
{
const int CreateLogFileMaxRetryCount = 128;
static readonly ConcurrentDictionary<string, ChannelInfo> Channels = new();
static readonly Channel<ChannelData> Channel;
static readonly ChannelWriter<ChannelData> ChannelWriter;
static readonly CancellationTokenSource CancellationToken = new();
static readonly TimeSpan FlushInterval = TimeSpan.FromSeconds(5);
static readonly Timer Timer;
static readonly Thread Thread;
static Log()
{
Channel = System.Threading.Channels.Channel.CreateUnbounded<ChannelData>();
ChannelWriter = Channel.Writer;
Thread = new Thread(DoWork)
{
Name = "OpenRA Logging Thread"
};
Thread.Start(CancellationToken.Token);
Timer = new Timer(FlushToDisk, CancellationToken.Token, FlushInterval, Timeout.InfiniteTimeSpan);
}
static void FlushToDisk(object state)
{
FlushToDisk();
var token = (CancellationToken)state;
if (!token.IsCancellationRequested)
Timer.Change(FlushInterval, Timeout.InfiniteTimeSpan);
}
static void FlushToDisk()
{
foreach (var (_, channel) in Channels)
channel.Writer?.Flush();
}
static void DoWork(object obj)
{
var token = (CancellationToken)obj;
var reader = Channel.Reader;
while (!token.IsCancellationRequested)
{
while (reader.TryRead(out var item))
WriteValue(item);
Thread.Sleep(1);
}
while (reader.TryRead(out var item))
WriteValue(item);
FlushToDisk();
}
static void WriteValue(ChannelData item)
{
var channel = GetChannel(item.Channel);
var writer = channel.Writer;
if (writer == null)
return;
if (!channel.IsTimestamped)
writer.WriteLine(item.Text);
else
{
var timestamp = DateTime.Now.ToString(Game.Settings.Server.TimestampFormat, CultureInfo.CurrentCulture);
writer.WriteLine("[{0}] {1}", timestamp, item.Text);
}
}
static IEnumerable<string> FilenamesForChannel(string baseFilename)
{
var path = Platform.SupportDir + "Logs";
Directory.CreateDirectory(path);
for (var i = 0; i < CreateLogFileMaxRetryCount; i++)
yield return Path.Combine(path, i > 0 ? $"{baseFilename}.{i}" : baseFilename);
throw new ApplicationException($"Error creating log file \"{baseFilename}\"");
}
static ChannelInfo GetChannel(string channelName)
{
if (!Channels.TryGetValue(channelName, out var info))
throw new ArgumentException("Tried logging to non-existent channel " + channelName, nameof(channelName));
return info;
}
public static void AddChannel(string channelName, string baseFilename, bool isTimestamped = false)
{
if (Channels.ContainsKey(channelName))
return;
if (string.IsNullOrEmpty(baseFilename))
{
Channels.TryAdd(channelName, default);
return;
}
foreach (var filename in FilenamesForChannel(baseFilename))
{
try
{
var writer = File.CreateText(filename);
writer.AutoFlush = false;
Channels.TryAdd(channelName,
new ChannelInfo
{
Filename = filename,
IsTimestamped = isTimestamped,
Writer = TextWriter.Synchronized(writer)
});
return;
}
catch (IOException) { }
}
}
public static void Write(string channelName, string value)
{
ChannelWriter.TryWrite(new ChannelData(channelName, value));
}
public static void Write(string channelName, Exception e)
{
ChannelWriter.TryWrite(new ChannelData(channelName, $"{e.Message}{Environment.NewLine}{e.StackTrace}"));
}
public static void Dispose()
{
CancellationToken.Cancel();
Timer.Dispose();
Thread.Join();
}
}
}