Logger.cs

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using Microsoft.Extensions.Logging;
 
namespace Fauna.Util;
 
internal static class Logger
{
    private static ILogger? s_logger;
 
    public static ILogger Instance
    {
        get
        {
            if (s_logger == null)
            {
                s_logger = InitializeDefaultLogger();
            }
 
            return s_logger;
        }
    }
 
    public static void Initialize(ILogger logger)
    {
        s_logger = logger;
    }
 
    private static ILogger InitializeDefaultLogger()
    {
        var logLevel = Environment.GetEnvironmentVariable("FAUNA_DEBUG");
        var minLogLevel = LogLevel.None;
 
        if (!string.IsNullOrEmpty(logLevel) && int.TryParse(logLevel, out var level))
        {
            if (level < (int)LogLevel.Trace || level > (int)LogLevel.None)
            {
                throw new ArgumentException(
                    $"Invalid FAUNA_DEBUG value of {level}; must be between 0 and 6 inclusive. Set to 0 for highest verbosity, default is 6 (no logging).");
            }
 
            minLogLevel = (LogLevel)level;
        }
 
        using ILoggerFactory factory = LoggerFactory.Create(builder => builder
            .AddConsole(options => options.LogToStandardErrorThreshold = LogLevel.Trace)
            .AddSimpleConsole(options =>
            {
                options.IncludeScopes = true;
                options.SingleLine = true;
                options.TimestampFormat = "yyyy-MM-ddTHH:mm:ss.fffZ ";
                options.UseUtcTimestamp = true;
            })
            .SetMinimumLevel(minLogLevel));
 
        return factory.CreateLogger("fauna-dotnet");
    }
}