internal static void UpdateSpan(IHttpControllerContext controllerContext, Span span, AspNetTags tags, IEnumerable <KeyValuePair <string, string> > headerTags)
{
try
{
var newResourceNamesEnabled = Tracer.Instance.Settings.RouteTemplateResourceNamesEnabled;
var request = controllerContext.Request;
Uri requestUri = request.RequestUri;
string host = request.Headers.Host ?? string.Empty;
string rawUrl = requestUri?.ToString().ToLowerInvariant() ?? string.Empty;
string method = request.Method.Method?.ToUpperInvariant() ?? "GET";
string route = null;
try
{
route = controllerContext.RouteData.Route.RouteTemplate;
}
catch
{
}
IDictionary <string, object> routeValues = null;
try
{
routeValues = controllerContext.RouteData.Values;
}
catch
{
}
string resourceName;
string controller = string.Empty;
string action = string.Empty;
string area = string.Empty;
if (route is not null && routeValues is not null)
{
resourceName = AspNetResourceNameHelper.CalculateResourceName(
httpMethod: method,
routeTemplate: route,
routeValues,
defaults: null,
out area,
out controller,
out action,
addSlashPrefix: newResourceNamesEnabled,
expandRouteTemplates: newResourceNamesEnabled && Tracer.Instance.Settings.ExpandRouteTemplatesEnabled);
}
else if (requestUri != null)
{
var cleanUri = UriHelpers.GetCleanUriPath(requestUri);
resourceName = $"{method} {cleanUri}";
}
else
{
resourceName = $"{method}";
}
if (route is null && routeValues is not null)
{
// we weren't able to get the route template (somehow) but _were_ able to
// get the route values. Not sure how this is possible, but is preexisting behaviour
try
{
controller = (routeValues.GetValueOrDefault("controller") as string)?.ToLowerInvariant();
action = (routeValues.GetValueOrDefault("action") as string)?.ToLowerInvariant();
area = (routeValues.GetValueOrDefault("area") as string)?.ToLowerInvariant();
}
catch
{
}
}
span.DecorateWebServerSpan(
resourceName: resourceName,
method: method,
host: host,
httpUrl: rawUrl,
tags,
headerTags);
if (tags is not null)
{
tags.AspNetAction = action;
tags.AspNetController = controller;
tags.AspNetArea = area;
tags.AspNetRoute = route;
}
if (newResourceNamesEnabled)
{
// set the resource name in the HttpContext so TracingHttpModule can update root span
var httpContext = System.Web.HttpContext.Current;
if (httpContext is not null)
{
httpContext.Items[SharedItems.HttpContextPropagatedResourceNameKey] = resourceName;
}
}
}
/// <summary>
/// Creates a scope used to instrument an MVC action and populates some common details.
/// </summary>
/// <param name="controllerContext">The System.Web.Mvc.ControllerContext that was passed as an argument to the instrumented method.</param>
/// <returns>A new scope used to instrument an MVC action.</returns>
internal static Scope CreateScope(ControllerContextStruct controllerContext)
{
Scope scope = null;
try
{
var httpContext = controllerContext.HttpContext;
if (httpContext == null)
{
return(null);
}
Span span = null;
// integration enabled, go create a scope!
var tracer = Tracer.Instance;
if (tracer.Settings.IsIntegrationEnabled(IntegrationId))
{
var newResourceNamesEnabled = tracer.Settings.RouteTemplateResourceNamesEnabled;
string host = httpContext.Request.Headers.Get("Host");
string httpMethod = httpContext.Request.HttpMethod.ToUpperInvariant();
string url = httpContext.Request.Url?.ToString(); // Upstream uses RawUrl, ie. the part of the URL following the domain information.
string resourceName = null;
RouteData routeData = controllerContext.RouteData;
Route route = routeData?.Route as Route;
RouteValueDictionary routeValues = routeData?.Values;
bool wasAttributeRouted = false;
bool isChildAction = controllerContext.ParentActionViewContext.RouteData?.Values["controller"] is not null;
if (isChildAction && newResourceNamesEnabled)
{
// For child actions, we want to stick to what was requested in the http request.
// And the child action being a child, then we have already computed the resourcename.
resourceName = httpContext.Items[SharedItems.HttpContextPropagatedResourceNameKey] as string;
}
if (route == null && routeData?.Route.GetType().FullName == RouteCollectionRouteTypeName)
{
var routeMatches = routeValues?.GetValueOrDefault("MS_DirectRouteMatches") as List <RouteData>;
if (routeMatches?.Count > 0)
{
// route was defined using attribute routing i.e. [Route("/path/{id}")]
// get route and routeValues from the RouteData in routeMatches
wasAttributeRouted = true;
route = routeMatches[0].Route as Route;
routeValues = routeMatches[0].Values;
}
}
string routeUrl = route?.Url;
string areaName;
string controllerName;
string actionName;
if ((wasAttributeRouted || newResourceNamesEnabled) && string.IsNullOrEmpty(resourceName) && !string.IsNullOrEmpty(routeUrl))
{
resourceName = AspNetResourceNameHelper.CalculateResourceName(
httpMethod: httpMethod,
routeTemplate: routeUrl,
routeValues,
defaults: wasAttributeRouted ? null : route.Defaults,
out areaName,
out controllerName,
out actionName,
expandRouteTemplates: newResourceNamesEnabled && tracer.Settings.ExpandRouteTemplatesEnabled);
}
else
{
// just grab area/controller/action directly
areaName = (routeValues?.GetValueOrDefault("area") as string)?.ToLowerInvariant();
controllerName = (routeValues?.GetValueOrDefault("controller") as string)?.ToLowerInvariant();
actionName = (routeValues?.GetValueOrDefault("action") as string)?.ToLowerInvariant();
}
if (string.IsNullOrEmpty(resourceName))
{
// Keep the legacy resource name, just to have something
resourceName = $"{httpMethod} {controllerName}.{actionName}";
}
SpanContext propagatedContext = null;
var tagsFromHeaders = Enumerable.Empty <KeyValuePair <string, string> >();
if (tracer.InternalActiveScope == null)
{
try
{
// extract propagated http headers
var headers = httpContext.Request.Headers.Wrap();
var propagator = SpanContextPropagator.Instance;
propagatedContext = propagator.Extract(headers);
tagsFromHeaders = headers.ExtractHeaderTags(tracer.Settings.HeaderTags, PropagationExtensions.HttpRequestHeadersTagPrefix);
}
catch (Exception ex)
{
Log.Error(ex, "Error extracting propagated HTTP headers.");
}
}
var tags = new AspNetTags();
scope = tracer.StartActiveInternal(resourceName, propagatedContext, tags: tags);
span = scope.Span;
span.DecorateWebServerSpan(
resourceName: resourceName,
method: httpMethod,
host: host,
httpUrl: url,
tags,
tagsFromHeaders,
httpContext.Request.UserHostAddress);
span.LogicScope = isChildAction ? ChildActionOperationName : OperationName;
tags.AspNetRoute = routeUrl;
tags.AspNetArea = areaName;
tags.AspNetController = controllerName;
tags.AspNetAction = actionName;
tags.SetAnalyticsSampleRate(IntegrationId, tracer.Settings, enabledWithGlobalSetting: true);
if (string.IsNullOrEmpty(httpContext.Items[SharedItems.HttpContextPropagatedResourceNameKey] as string))
{
// set the resource name in the HttpContext so TracingHttpModule can update root span
httpContext.Items[SharedItems.HttpContextPropagatedResourceNameKey] = resourceName;
}
tracer.TracerManager.Telemetry.IntegrationGeneratedSpan(IntegrationId);
}
}
catch (Exception ex)
{
Log.Error(ex, "Error creating or populating scope.");
}
return(scope);
}