public void StartRemoteChildSpan_WithProbabilitySamplerDefaultSampler()
{
var configMock = Mock.Get <ITraceConfig>(traceConfig);
configMock.Setup((c) => c.ActiveTraceParams).Returns(TraceParams.Default);
// This traceId will not be sampled by the ProbabilitySampler because the first 8 bytes as long
// is not less than probability * Long.MAX_VALUE;
var traceId =
ActivityTraceId.CreateFromBytes(
new byte[] { 0x8F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0, 0, 0, 0, 0, 0, 0, 0, });
// If parent is sampled then the remote child must be sampled.
var childSpan =
new SpanBuilder(SpanName, spanBuilderOptions)
.SetSpanKind(SpanKind.Internal)
.SetParent(SpanContext.Create(
traceId,
ActivitySpanId.CreateRandom(),
ActivityTraceFlags.Recorded,
Tracestate.Empty))
.StartSpan();
Assert.True(childSpan.Context.IsValid);
Assert.Equal(traceId, childSpan.Context.TraceId);
Assert.True((childSpan.Context.TraceOptions & ActivityTraceFlags.Recorded) != 0);
childSpan.End();
Assert.Equal(TraceParams.Default, traceConfig.ActiveTraceParams);
// If parent is not sampled then the remote child must be not sampled.
childSpan =
new SpanBuilder(SpanName, spanBuilderOptions)
.SetSpanKind(SpanKind.Internal)
.SetParent(SpanContext.Create(
traceId,
ActivitySpanId.CreateRandom(),
ActivityTraceFlags.None,
Tracestate.Empty))
.StartSpan();
Assert.True(childSpan.Context.IsValid);
Assert.Equal(traceId, childSpan.Context.TraceId);
Assert.True((childSpan.Context.TraceOptions & ActivityTraceFlags.Recorded) == 0);
childSpan.End();
}
public async Task InvokeAsync(HttpContext context, RequestDelegate next)
{
var spanContext = _spanContextExtractor
.Extract(context.Request)
.Sample(_sampler);
var spanBuilder = new SpanBuilder(spanContext);
spanBuilder.Start()
.Name(context.Request.Method)
.Kind(SpanKind.Server)
.Tag("host", context.Request.Host.Value)
.Tag("resource", context.Request.Path.Value)
.Tag("method", context.Request.Method)
.WithLocalEndpoint(new Endpoint
{
ServiceName = _localEndpointName
});
_spanContextAccessor.SaveContext(spanContext);
try
{
await next(context);
}
catch (Exception ex)
{
spanBuilder.Error(ex.Message);
}
finally
{
var span = spanBuilder
.End()
.Build();
try
{
_dispatcher.Dispatch(span);
}
catch (DispatchException)
{
// ignore
}
}
}