private TraceLevel ConvertToLogJamTraceLevel(System.Web.Http.Tracing.TraceLevel level)
{
switch (level)
{
case System.Web.Http.Tracing.TraceLevel.Off:
return(TraceLevel.Off);
case System.Web.Http.Tracing.TraceLevel.Debug:
return(TraceLevel.Debug);
case System.Web.Http.Tracing.TraceLevel.Info:
// Info is used promiscuously in Web API - thus we switch it to Verbose.
return(TraceLevel.Verbose);
case System.Web.Http.Tracing.TraceLevel.Warn:
return(TraceLevel.Warn);
case System.Web.Http.Tracing.TraceLevel.Error:
return(TraceLevel.Error);
case System.Web.Http.Tracing.TraceLevel.Fatal:
return(TraceLevel.Severe);
default:
throw new ArgumentException("Value " + level + " is invalid.", "level");
}
}
/// <summary>
/// Trace the specified values in a new <see cref="System.Web.Http.Tracing.TraceRecord" /> if and only if tracing is
/// permitted at the given category and level.
/// </summary>
/// <param name="request">
/// The current <see cref="System.Net.Http.HttpRequestMessage" />. It may be null but doing so will prevent subsequent
/// trace analysis
/// from correlating the trace to a particular request.
/// </param>
/// <param name="category">The logical category for the trace. Users can define their own.</param>
/// <param name="level">The <see cref="System.Web.Http.Tracing.TraceLevel" /> at which to write this trace.</param>
/// <param name="traceAction">
/// The action to invoke if tracing is enabled. The caller is expected to fill in the fields of the
/// given <see cref="System.Web.Http.Tracing.TraceRecord" /> in this action.
/// </param>
public void Trace(HttpRequestMessage request, string category, System.Web.Http.Tracing.TraceLevel level, Action <System.Web.Http.Tracing.TraceRecord> traceAction)
{
Tracer tracer = _tracerFactory.GetTracer(category);
TraceLevel traceLevel = ConvertToLogJamTraceLevel(level);
if (tracer.IsTraceEnabled(traceLevel))
{
var sb = new StringBuilder();
if (request != null)
{
long requestNum = request.GetRequestNumber();
if (requestNum > 0)
{
sb.Append(requestNum);
}
else
{
sb.Append(request.RequestUri.OriginalString);
}
sb.Append(": ");
}
var traceRecord = new System.Web.Http.Tracing.TraceRecord(request, category, level);
traceAction(traceRecord);
sb.AppendFormat("{0} {1} {2} {3}", traceRecord.Kind, traceRecord.Operation, traceRecord.Operator, traceRecord.Message);
// Avoid logging the same exception over and over
Exception traceException = traceRecord.Exception;
if (traceException != null)
{
if (request != null)
{
if (request.HasRequestExceptionBeenLogged(traceException))
{
sb.AppendLine();
sb.Append(" (exception already logged)");
tracer.Trace(traceLevel, sb.ToString());
}
else
{
request.LoggedRequestException(traceException);
tracer.Trace(traceLevel, traceException, sb.ToString());
}
}
}
else
{
tracer.Trace(traceLevel, sb.ToString());
}
}
}
public void Log(TraceLevel level, string message, Exception ex)
{
Debug.WriteLine($"Log: {level.ToString()} - {message} - {ex?.Message}");
}
