private void BeginRequest(object sender, EventArgs e)
{
TraceHeaderContext headerContext = TraceHeaderContext.FromRequest(HttpContext.Current.Request);
TraceOptions headerOptions = _headerFactory.CreateOptions(headerContext);
// If the trace header says to trace or if the rate limiter allows tracing continue.
if (!headerOptions.ShouldTrace)
{
TraceOptions options = _rateFactory.CreateOptions();
if (!options.ShouldTrace)
{
return;
}
}
// Create and set the tracer for the request.
Trace trace = new Trace()
{
ProjectId = _projectId,
TraceId = headerContext.TraceId ?? _traceIdfactory.NextId(),
};
IManagedTracer tracer = SimpleManagedTracer.Create(_bufferingConsumer, trace, headerContext.SpanId);
TracerManager.SetCurrentTracer(tracer);
// Start the span and annotate it with information from the current request.
tracer.StartSpan(HttpContext.Current.Request.Path);
tracer.AnnotateSpan(Labels.FromHttpRequest(HttpContext.Current.Request));
}
/// <summary>
/// Create a new <see cref="TraceHeaderTraceOptionsFactory"/> from a <see cref="TraceHeaderContext"/>
/// </summary>
public TraceOptions CreateOptions(TraceHeaderContext context)
{
GaxPreconditions.CheckNotNull(context, nameof(context));
return(TraceOptions.Create(context.ShouldTrace));
}
/// <summary> /// Create a new <see cref="TraceHeaderTraceOptionsFactory"/>. /// </summary> public TraceOptions CreateOptions() => CreateOptions(TraceHeaderContext.FromRequest(HttpContext.Current.Request));
