internal void BeginRequest(object sender, EventArgs e)
{
var request = HttpContext.Current.Request;
string header = request.Headers.Get(TraceHeaderContext.TraceHeader);
var headerContext = TraceHeaderContext.FromHeader(
header, () => _traceFallbackPredicate?.ShouldTrace(request));
var tracer = _tracerFactory(headerContext);
if (tracer.GetCurrentTraceId() == null)
{
return;
}
ContextInstanceManager.Set(tracer);
if (headerContext.TraceId != null)
{
// Set the updated trace header on the response.
var updatedHeaderContext = TraceHeaderContext.Create(
tracer.GetCurrentTraceId(), tracer.GetCurrentSpanId() ?? 0, true);
HttpContext.Current.Response.Headers.Set(
TraceHeaderContext.TraceHeader, updatedHeaderContext.ToString());
}
// Start the span and annotate it with information from the current request.
var span = tracer.StartSpan(HttpContext.Current.Request.Path);
ContextInstanceManager.Set(span);
tracer.AnnotateSpan(Labels.FromHttpRequest(HttpContext.Current.Request));
tracer.AnnotateSpan(Labels.AgentLabel);
}
internal void EndRequest(object sender, EventArgs e)
{
ISpan span = ContextInstanceManager.Get <ISpan>();
if (span == null)
{
return;
}
// End the span and annotate it with information from the current response.
span.AnnotateSpan(Labels.FromHttpResponse(HttpContext.Current.Response));
span.Dispose();
}
