ServiceStack structured logging

Question

How can I get structured logging when using e.g. Serilog with Servicestack?

The examples from both Serilog and NLog have the form Log.Information("Hello World from {FirstName}", "Thomas"); for which I cannot find a matching method signature in ServiceStack.

There is DebugFormat, InfoFormat, WarnFormat and ErrorFormat — Rolf Kristensen
– Rolf Kristensen, Commented Jun 7, 2020 at 20:02
@RolfKristensen how do they work? Would log.PushProperty("FirstName", "Thomas") then log.InfoFormat("Hello World from {FirstName}"); work? So I'd need to write two lines? — specimen
– specimen, Commented Jun 8, 2020 at 14:03
@speciman You asked for something that matched Log.Information. If you want something that matches Log.PushProperty then you should update your question. — Rolf Kristensen
– Rolf Kristensen, Commented Jun 8, 2020 at 15:52
@RolfKristensen - I did not see the xxxFormat methods in the docs, that got me confused. They are just what I was looking for. — specimen
– specimen, Commented Jun 9, 2020 at 10:18

mythz · Accepted Answer · 2020-06-08 16:17:40Z

3

See logging docs for enhanced Serilog Logging APIs whilst this existing StackOverflow answer shows a Serilog Enrichers example.

SerilogLoggerTests.cs shows different examples of using Serilog:

var log = new SerilogLogger(GetType());

const string message = "Error Message";
const string messageFormat = "Message Format: message: {0}, exception: {1}";

var ex = new Exception();
log.Info(message);
log.Info(message, ex);
log.InfoFormat(messageFormat, message, ex.Message);
log.Info(ex, messageFormat, messageFormat, ex);

and a Log Context example with custom properties:

var log = new SerilogLogger(new LoggerConfiguration()
    .WriteTo.Sink(sink).CreateLogger());

var messageTemplate = "Testing adding {prop2} props";
log.ForContext("prop", "value").InfoFormat(messageTemplate, "awesome");

There's also PushProperty() APIs to assign custom properties, see Serilog's Enrichment docs for examples.

edited Jun 8, 2020 at 16:17

answered Jun 7, 2020 at 10:24

mythz

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3 Comments

specimen Over a year ago

Already saw the docs, but did not understand. It seems they all need an exception to work, e.g. ILog.Info(Exception ex, string messageTemplate, params object[] propertyValues). I don't have an exception, just want to log template + params. Can I pass null as the first param?

mythz Over a year ago

@specimen there are different overloads you can use, see updated answer.

specimen Over a year ago

I did not see the xxxFormat methods in the docs, that got me confused. They are just what I was looking for.

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