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
}
}
}
public object AfterReceiveRequest(ref Message request, IClientChannel channel, InstanceContext instanceContext)
{
var spanContext = _spanContextExtractor
.Extract(WebOperationContext.Current?.IncomingRequest);
spanContext.Sample(_sampler);
var spanBuilder = new SpanBuilder(spanContext);
spanBuilder.Start()
.Tag("action", request.Headers.Action)
.Kind(SpanKind.Server)
.WithLocalEndpoint(new Endpoint
{
ServiceName = _localEndpointName
});
_spanContextAccessor.SaveContext(spanContext);
return(spanBuilder);
}