public async Task Invoke(HttpContext context)
{
if (httpListener.IsEnabled("Http_InStart"))
{
var activity = new Activity("Http_In");
// Transfer ID and baggage.
foreach (var header in context.Request.Headers)
{
if (header.Key == HttpHeaderConstants.ActivityIdHeaderName) // Check for x-ms-request-id
{
activity.WithParentId(header.Value);
}
else if (header.Key == HttpHeaderConstants.CorrelationIdHeaderName || header.Key.StartsWith(HttpHeaderConstants.BaggageHeaderPrefix))
{
activity.WithBaggage(header.Key, header.Value);
}
}
// Start the activity represending this incomming HTTP request.
httpListener.Start(activity, context);
if (!context.Request.Headers.ContainsKey(HttpHeaderConstants.CorrelationIdHeaderName))
{
activity.WithBaggage(HttpHeaderConstants.CorrelationIdHeaderName, Guid.NewGuid().ToString());
}
try
{
await next.Invoke(context);
}
finally
{
httpListener.Stop(activity, context);
}
}
else
{
await next.Invoke(context);
}
}
