internal static Scope CreateScope(IHttpControllerContext controllerContext, out AspNetTags tags)
{
Scope scope = null;
tags = null;
try
{
if (!Tracer.Instance.Settings.IsIntegrationEnabled(IntegrationId))
{
// integration disabled, don't create a scope, skip this trace
return(null);
}
var tracer = Tracer.Instance;
var request = controllerContext.Request;
SpanContext propagatedContext = null;
var tagsFromHeaders = Enumerable.Empty <KeyValuePair <string, string> >();
if (request != null && tracer.InternalActiveScope == null)
{
try
{
// extract propagated http headers
var headers = request.Headers;
var headersCollection = new HttpHeadersCollection(headers);
propagatedContext = SpanContextPropagator.Instance.Extract(headersCollection);
tagsFromHeaders = SpanContextPropagator.Instance.ExtractHeaderTags(headersCollection, tracer.Settings.HeaderTags, SpanContextPropagator.HttpRequestHeadersTagPrefix, request.Headers.UserAgent.ToString());
}
catch (Exception ex)
{
Log.Error(ex, "Error extracting propagated HTTP headers.");
}
}
tags = new AspNetTags();
scope = tracer.StartActiveInternal(OperationName, propagatedContext, tags: tags);
UpdateSpan(controllerContext, scope.Span, tags, tagsFromHeaders);
tags.SetAnalyticsSampleRate(IntegrationId, tracer.Settings, enabledWithGlobalSetting: true);
tracer.TracerManager.Telemetry.IntegrationGeneratedSpan(IntegrationId);
}
catch (Exception ex)
{
Log.Error(ex, "Error creating scope.");
}
return(scope);
}
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
{
}
string resourceName;
if (route != null)
{
resourceName = $"{method} {(newResourceNamesEnabled ? "/" : string.Empty)}{route.ToLowerInvariant()}";
}
else if (requestUri != null)
{
var cleanUri = UriHelpers.GetCleanUriPath(requestUri);
resourceName = $"{method} {cleanUri.ToLowerInvariant()}";
}
else
{
resourceName = $"{method}";
}
string controller = string.Empty;
string action = string.Empty;
string area = string.Empty;
try
{
var routeValues = controllerContext.RouteData.Values;
if (routeValues != null)
{
controller = (routeValues.GetValueOrDefault("controller") as string)?.ToLowerInvariant();
action = (routeValues.GetValueOrDefault("action") as string)?.ToLowerInvariant();
area = (routeValues.GetValueOrDefault("area") as string)?.ToLowerInvariant();
}
}
catch
{
}
// Replace well-known routing tokens
resourceName =
resourceName
.Replace("{area}", area)
.Replace("{controller}", controller)
.Replace("{action}", action);
span.DecorateWebServerSpan(
resourceName: resourceName,
method: method,
host: host,
httpUrl: rawUrl,
tags,
headerTags);
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[SharedConstants.HttpContextPropagatedResourceNameKey] = resourceName;
}
}
}
catch (Exception ex)
{
Log.Error(ex, "Error populating scope data.");
}
}
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;
}
}
}
