internal static RequestTelemetry CreateRequestTelemetryPrivate(
this HttpContext platformContext)
{
if (platformContext == null)
{
throw new ArgumentException("platformContext");
}
#if NET40
var result = ActivityHelpers.ParseRequest(platformContext);
#else
var result = new RequestTelemetry();
var currentActivity = Activity.Current;
var requestContext = result.Context.Operation;
if (currentActivity == null)
{
// if there was no BeginRequest, ASP.NET HttpModule did not have a chance to set current activity (and will never do it).
currentActivity = new Activity(ActivityHelpers.RequestActivityItemName);
if (currentActivity.TryParse(platformContext.Request.Headers))
{
requestContext.ParentId = currentActivity.ParentId;
}
else
{
string rootId, parentId;
if (ActivityHelpers.TryParseCustomHeaders(platformContext.Request, out rootId, out parentId))
{
currentActivity.SetParentId(rootId);
if (!string.IsNullOrEmpty(parentId))
{
requestContext.ParentId = parentId;
}
}
else
{
// This is workaround for the issue https://github.com/Microsoft/ApplicationInsights-dotnet/issues/538
// if there is no parent Activity, ID Activity generates is not random enough to work well with
// ApplicationInsights sampling algorithm
// This code should go away when Activity is fixed: https://github.com/dotnet/corefx/issues/18418
currentActivity.SetParentId(result.Id);
// end of workaround
}
}
currentActivity.Start();
}
else
{
if (ActivityHelpers.IsHierarchicalRequestId(currentActivity.ParentId))
{
requestContext.ParentId = currentActivity.ParentId;
}
else
{
var parentId =
platformContext.Request.UnvalidatedGetHeader(ActivityHelpers.ParentOperationIdHeaderName);
if (!string.IsNullOrEmpty(parentId))
{
requestContext.ParentId = parentId;
}
}
}
// we have Activity.Current, we need to properly initialize request telemetry and store it in HttpContext
if (string.IsNullOrEmpty(requestContext.Id))
{
requestContext.Id = currentActivity.RootId;
foreach (var item in currentActivity.Baggage)
{
result.Context.Properties[item.Key] = item.Value;
}
}
result.Id = currentActivity.Id;
// save current activity in case it will be lost - we will use it in Web.OperationCorrelationTelemetryIntitalizer
platformContext.Items[ActivityHelpers.RequestActivityItemName] = currentActivity;
#endif
platformContext.Items.Add(RequestTrackingConstants.RequestTelemetryItemName, result);
WebEventSource.Log.WebTelemetryModuleRequestTelemetryCreated();
return(result);
}