public object BeforeSendRequest(ref Message request, IClientChannel channel)
{
var spanContext = _spanContextAccessor.HasContext()
? _spanContextAccessor
.GetContext()
.CreateChild()
: new SpanContext();
spanContext.Sample(_sampler);
var httpRequest = ExtractHttpRequest(request);
// Inject X-B3 headers to the outgoing request
_spanContextInjector.Inject(httpRequest, spanContext);
var spanBuilder = new SpanBuilder(spanContext);
spanBuilder.Start()
.Kind(SpanKind.Client)
.Tag("action", request.Headers.Action)
.WithRemoteEndpoint(new Endpoint
{
ServiceName = _remoteServiceName
});
return(spanBuilder);
}
protected override async Task <HttpResponseMessage> SendAsync(
HttpRequestMessage request, CancellationToken cancellationToken)
{
var spanContext = _spanContextAccessor.HasContext()
? _spanContextAccessor
.GetContext()
.CreateChild()
: new SpanContext();
spanContext.Sample(_sampler);
var spanBuilder = new SpanBuilder(spanContext);
spanBuilder.Start()
.Name(request.Method.Method)
.Kind(SpanKind.Client)
.Tag("uri", request.RequestUri.OriginalString)
.Tag("method", request.Method.Method)
.WithRemoteEndpoint(new Endpoint
{
ServiceName = _remoteEndpointName
});
// Add X-B3 headers to the request
request = _spanContextInjector.Inject(request, spanContext);
try
{
return(await base.SendAsync(request, cancellationToken));
}
catch (Exception ex)
{
spanBuilder.Error(ex.Message);
throw;
}
finally
{
var span = spanBuilder
.End()
.Build();
try
{
_dispatcher.Dispatch(span);
}
catch (DispatchException)
{
// ignore
}
}
}