Serilog Multiple Sinks Not Working

Question

I'm using serilog to log all the Web API trace events in to one file and all the code debug to another file by the below code:

The problem is that the trace.json is also logging Debug events as well which I suspect is because of the minimumLevel filter.

How do I separate the events into two files ?

Tried this Question, but it doesn't write the file at all.

Using latest serilog version.

Log.Logger = new LoggerConfiguration()
.WriteTo.Trace(outputTemplate: "{Timestamp} [{Level}] ({HttpRequestId}|{UserName}) {Message}{NewLine}{Exception}")
.MinimumLevel.Debug()
.WriteTo.Sink(new FileSink(@"E:\log.json", new JsonFormatter(false, null, true), null), LogEventLevel.Debug)
.MinimumLevel.Verbose()
.WriteTo.Sink(new FileSink(@"E:\trace.json", new JsonFormatter(false, null, true), null), LogEventLevel.Verbose)
.Enrich.With<HttpRequestIdEnricher>()
.Enrich.With<UserNameEnricher>()
.Enrich.WithProperty("App", "CarbonFactoryERP")
.CreateLogger();

and below is how I call the logger:

Log.Logger.Debug("Web API Register Method started at {TimeStamp}",DateTime.UtcNow);

Log.Logger.Verbose("{TimeStamp} {Operation} {Operator} {Message} {Category}", rec.Timestamp, rec.Operation, rec.Operator, rec.Message, rec.Category);

score 1 · Answer 1 · answered Mar 24 '15 at 00:52

1

This is the expected behavior of Serilog sinks. The minimum level parameter specifies only the minimum, as you'd expect - not an exact level match.

To get around this and write only a specific level to a sink, you can create a separate logging pipeline with the restriction applied and use that:

Log.Logger = new LoggerConfiguration()
    .MinimumLevel.Verbose()
    .WriteTo.Logger(config => config
        .Filter.ByIncludingOnly(e => e.Level == LogEventLevel.Debug)
        .WriteTo.Sink(new FileSink(@"E:\trace.json", ...))
    // Write to other sinks here

(May need a few typo corrections, working from memory.)

answered Mar 24 '15 at 00:52

Nicholas Blumhardt

30,271
4
90
101

As already mentioned in the question, I tried this and the log file is not getting written at all when I use the Filter. I tried again and still same. – Dev Mar 24 '15 at 03:49
I've decided to go with multiple top level loggers until I get this working. – Dev Mar 24 '15 at 13:50

score 0 · Answer 2 · answered Jan 03 '17 at 16:34

This example will log to the same sink (but could write to different ones) depending in the log level and SourceContext (Application namespace, class name etc.). It has a verbose minimun log level for all classes of MyAppRootNamespace and a warning minimun log level for other source contexts (Microsoft.* etc.). This will give you a starting point to your exact needs.

Log.Logger = new LoggerConfiguration()
                .MinimumLevel.Verbose()
                .Enrich.FromLogContext()
                .WriteTo.Logger(lc => lc
                    .Filter.ByIncludingOnly(Matching.FromSource("MyAppRootNamespace"))
                    .WriteTo.Seq("http://localhost:1009"))
                .WriteTo.Logger(lc => lc
                    .Filter.ByIncludingOnly(e => e.Level >= LogEventLevel.Warning)
                    .Filter.ByExcluding(Matching.FromSource("MyAppRootNamespace"))
                    .WriteTo.Seq("http://localhost:1009"))
                .CreateLogger();

For the source context (MyAppRootNamespace) to work you will need to add a vble to each class you want to log from.

public class MyClass
{
    private ILogger _log = Log.ForContext<MyClass>();
}

Serilog Multiple Sinks Not Working

2 Answers2