Serilog-将级别转换为Syslog标准

Question

我正在使用Azure IoT Edge容器，我们正在使用Serilog。 Microsoft建议以本文所示的格式输出日志文本： https://learn.microsoft.com/en-us/azure/azure/iot-ege/iot-egge/how-to-to-to-to-to-to-regrieve-iot-iot-egge--ge----------------------- logs？view = iotedge-2020-11 。它会将这样的线输出到控制台：

＆lt; 6＆gt; 2022-06-15 13：05：44.790 +00：00 [inf] - 接收到直接方法调用 - ping

我的问题是 - 如何显示两次级别？第二个很容易（{级别：u3}），但是如何在行开头将级别转换为syslog编号？数字参考是在上面文章的开头。我考虑过文本格式器，但是我需要格式的两种不同的方式，并且不确定这是否有效。

想法？

Answer 1

我把它与文本形式的人一起工作

internal class ConsoleTextFormatter : ITextFormatter
    {
        public void Format(LogEvent logEvent, TextWriter output)
        {
            var sb = new StringBuilder();
            sb.AppendLine($"<{GetSysLogLevel(logEvent.Level)}> {logEvent.Timestamp:O} [{GetThreeLetterLevel(logEvent.Level)}] - {logEvent.MessageTemplate}");
            if (logEvent.Exception != null)
                sb.AppendLine(logEvent.Exception.ToString());
            foreach (var property in logEvent.Properties.Where(p => p.Key != "SourceContext"))
            {
                sb.AppendLine($"{property.Key}={property.Value}");
            }

            output.Write(sb.ToString());
        }

        // these are in a static class that I cannot access (https://github.com/serilog/serilog/blob/dev/src/Serilog/Formatting/Display/LevelOutputFormat.cs),
        // so I have hard coded them here
        private string GetThreeLetterLevel(LogEventLevel level)
        {
            return level switch
            {
                LogEventLevel.Debug => "DBG",
                LogEventLevel.Error => "ERR",
                LogEventLevel.Fatal => "FTL",
                LogEventLevel.Information => "INF",
                LogEventLevel.Verbose => "VRB",
                LogEventLevel.Warning => "WRN",
                _ => throw new NotSupportedException("Unknown log level")
            };
        }

        private string GetSysLogLevel(LogEventLevel level)
        {
            return level switch
            {
                LogEventLevel.Debug => "7",
                LogEventLevel.Error => "3",
                LogEventLevel.Fatal => "2", // critical
                LogEventLevel.Information => "6",
                LogEventLevel.Verbose => "7",   // debug also
                LogEventLevel.Warning => "4",
                _ => throw new NotSupportedException("Unknown log level")
            };
        }