/// <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(); } } }