/// <summary>
/// Invokes the next <see cref="RequestDelegate"/> and traces the time
/// taken for the next delegate to run, reporting the results to the
/// Stackdriver Trace API.
/// </summary>
/// <param name="httpContext">The current HTTP context.</param>
/// <param name="traceHeaderContext">Information from the current request header. Must not be null.</param>
public async Task Invoke(HttpContext httpContext, TraceHeaderContext traceHeaderContext)
{
GaxPreconditions.CheckNotNull(traceHeaderContext, nameof(traceHeaderContext));
// Create a tracer for the given request and set it on the context manager so
// the tracer can be used in other places.
var tracer = _tracerFactory(traceHeaderContext);
ContextTracerManager.SetCurrentTracer(tracer);
if (tracer.GetCurrentTraceId() == null)
{
await _next(httpContext).ConfigureAwait(false);
}
else
{
if (traceHeaderContext.TraceId != null)
{
// Set the trace updated trace header on the response.
var updatedHeaderContext = TraceHeaderContext.Create(
tracer.GetCurrentTraceId(), tracer.GetCurrentSpanId() ?? 0, true);
httpContext.Response.Headers.Add(
TraceHeaderContext.TraceHeader, updatedHeaderContext.ToString());
}
// Trace the delegate and annotate it with information from the current
// HTTP context.
var traceName = await _nameProvider.GetTraceNameAsync(httpContext).ConfigureAwait(false);
var span = tracer.StartSpan(traceName);
try
{
await _next(httpContext).ConfigureAwait(false);
}
catch (Exception exception)
{
try
{
StackTrace stackTrace = new StackTrace(exception, true);
tracer.SetStackTrace(stackTrace);
}
catch (Exception innerException)
{
throw new AggregateException(innerException, exception);
}
throw;
}
finally
{
tracer.AnnotateSpan(Labels.AgentLabel);
tracer.AnnotateSpan(Labels.FromHttpContext(httpContext));
span.Dispose();
}
}
}
/// <summary>
/// Invokes the next <see cref="RequestDelegate"/> and traces the time
/// taken for the next delegate to run, reporting the results to the
/// Stackdriver Trace API.
/// </summary>
/// <param name="httpContext">The current http context.</param>
/// <param name="traceHeaderContext">Information from the current requrest header. Cannot be null.</param>
public async Task Invoke(HttpContext httpContext, TraceHeaderContext traceHeaderContext)
{
GaxPreconditions.CheckNotNull(traceHeaderContext, nameof(traceHeaderContext));
// Create a tracer for the given request and set it on the HttpContext so
// the tracer can be used in other places.
var tracer = _tracerFactory.CreateTracer(traceHeaderContext);
ContextTracerManager.SetCurrentTracer(_accessor, tracer);
if (tracer.GetCurrentTraceId() == null)
{
await _next(httpContext).ConfigureAwait(false);
}
else
{
if (traceHeaderContext.TraceId != null)
{
// Set the trace updated trace header on the response.
var updatedHeaderContext = TraceHeaderContext.Create(
tracer.GetCurrentTraceId(), tracer.GetCurrentSpanId() ?? 0, true);
httpContext.Response.Headers.Add(
TraceHeaderContext.TraceHeader, updatedHeaderContext.ToString());
}
// Trace the delegate and annotate it with information from the current
// http context.
tracer.StartSpan(httpContext.Request.Path);
try
{
await _next(httpContext).ConfigureAwait(false);
}
catch (Exception e)
{
StackTrace stackTrace = new StackTrace(e, true);
tracer.SetStackTrace(stackTrace);
throw;
}
finally
{
tracer.AnnotateSpan(Labels.AgentLabel);
tracer.AnnotateSpan(Labels.FromHttpContext(httpContext));
tracer.EndSpan();
}
}
}
