GSS2Rework/GSS2.Test/FileLogger.cs

namespace GSS2.Test;

public sealed class FileLogger : ILogger
{
    private readonly string _category;
    private readonly string _filePath;
    private static readonly object _lock = new();

    public FileLogger(string category, string filePath)
    {
        _category = category;
        _filePath = filePath;
    }

#pragma warning disable CS8633 // Nullability in constraints for type parameter doesn't match the constraints for type parameter in implicitly implemented interface method'.
    public IDisposable? BeginScope<TState>(TState state) => null;
#pragma warning restore CS8633 // Nullability in constraints for type parameter doesn't match the constraints for type parameter in implicitly implemented interface method'.

    public bool IsEnabled(LogLevel logLevel) => true;

    public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception? exception, Func<TState, Exception?, string> formatter)
    {
        var timestamp = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff");
        var level = logLevel switch
        {
            LogLevel.Trace => "TRACE",
            LogLevel.Debug => "DEBUG",
            LogLevel.Information => "INFO",
            LogLevel.Warning => "WARN",
            LogLevel.Error => "ERROR",
            LogLevel.Critical => "CRIT",
            _ => "NONE",
        };
        var message = formatter(state, exception);

        var line = $"[{timestamp}] [{level}] [{_category}] [{eventId.Id}] [{eventId.Name}] {message}";

        lock (_lock)
        {
            File.AppendAllText(_filePath, line + Environment.NewLine);

            if (exception != null)
                File.AppendAllText(_filePath, exception + Environment.NewLine);
        }
    }
}