brick-framework/GameCore/Logging/FileLogger.cs

using System.Text;
using GameCore.Logging.Interfaces;

namespace GameCore.Logging;

public class FileLogger : ILogger, IDisposable
{
    private readonly object _lock = new();
    private readonly LogLevel _minLogLevel = LogLevel.Debug;
    private readonly StreamWriter _streamWriter;

    public FileLogger(string filePath, LogLevel minLogLevel = LogLevel.Debug)
    {
        _minLogLevel = minLogLevel;

        var stream = new FileStream(filePath, FileMode.Append, FileAccess.Write, FileShare.Read);
        _streamWriter = new StreamWriter(stream, Encoding.UTF8);
        _streamWriter.AutoFlush = true;
    }

    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }

    public void Debug(string message)
    {
        Log(LogLevel.Debug, message);
    }

    public void Info(string message)
    {
        Log(LogLevel.Info, message);
    }

    public void Warn(string message)
    {
        Log(LogLevel.Warn, message);
    }

    public void Error(string message, Exception? ex = null)
    {
        Log(LogLevel.Error, message, ex);
    }

    protected virtual void Dispose(bool disposing)
    {
        if (disposing)
            lock (_lock)
            {
                _streamWriter?.Dispose();
            }
    }

    ~FileLogger()
    {
        Dispose(false);
    }

    private void Log(LogLevel level, string message, Exception? ex = null)
    {
        if (level < _minLogLevel) return;

        var logMessage = $"[{DateTime.Now:yyyy-MM-dd HH:mm:ss.ffff}] [{level.ToString().ToUpper()}] {message}";

        lock (_lock)
        {
            _streamWriter.WriteLine(logMessage);
            if (ex != null) _streamWriter.WriteLine(ex.ToString());
        }
    }
}