StationProbe/StationProbe/Logger.cs

namespace StationProbe
{
    internal class Logger
    {
        private static DateTime _date;

        private static StreamWriter? _logWriter;

        private static readonly object _logWriterLocker = new();

        public static bool ConsoleOutput { get; set; } = true;

        static Logger()
        {
            RebuildLogger();
        }

        private static void RebuildLogger()
        {
            var logDirectory = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "logs");
            if (!Directory.Exists(logDirectory))
            {
                Directory.CreateDirectory(logDirectory);
            }
            var today = DateTime.Today;
            var logTag = $"{today:yyyyMMdd}";
            var logFileName = $"log_{logTag}.log";
            var logFile = Path.Combine(logDirectory, logFileName);
            if (!File.Exists(logFile))
            {
                _logWriter?.Close();
                var logFileStream = new FileStream(logFile, FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite);
                _logWriter = new StreamWriter(logFileStream);
            }
            else
            {
                _logWriter?.Close();
                var logFileStream = new FileStream(logFile, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
                logFileStream.Position = logFileStream.Length;
                _logWriter = new StreamWriter(logFileStream);
            }
        }

        public static void WriteLine(string log)
        {
            lock (_logWriterLocker)
            {
                if (DateTime.Today != _date)
                {
                    RebuildLogger();
                    _date = DateTime.Today;
                }
                try
                {
                    var now = DateTime.Now;
                    var message = $"[{now:HH:mm:ss},{now.Millisecond:d3}]-{log}";
                    _logWriter?.WriteLine(message);
                    _logWriter?.Flush();
                    if (ConsoleOutput)
                    {
                        Console.WriteLine(message);
                    }
                }
                catch (Exception)
                {
                    // There is exception during writing log, so just ignore
                }
            }
        }
    }
}