private void ProcessStartEvent(TRequest request, Uri requestUrl)
{
Logger.Trace()?.Log("Processing start event... Request URL: {RequestUrl}", Http.Sanitize(requestUrl));
var transaction = ApmAgent.Tracer.CurrentTransaction;
if (transaction == null)
{
Logger.Debug()?.Log("No current transaction, skip creating span for outgoing HTTP request");
return;
}
var span = ExecutionSegmentCommon.StartSpanOnCurrentExecutionSegment(ApmAgent, $"{RequestGetMethod(request)} {requestUrl.Host}",
ApiConstants.TypeExternal, ApiConstants.SubtypeHttp, InstrumentationFlag.HttpClient, true);
if (!ProcessingRequests.TryAdd(request, span))
{
// Consider improving error reporting - see https://github.com/elastic/apm-agent-dotnet/issues/280
Logger.Error()?.Log("Failed to add to ProcessingRequests - ???");
return;
}
if (!RequestHeadersContain(request, TraceContext.TraceParentHeaderName))
{
// We call TraceParent.BuildTraceparent explicitly instead of DistributedTracingData.SerializeToString because
// in the future we might change DistributedTracingData.SerializeToString to use some other internal format
// but here we want the string to be in W3C 'traceparent' header format.
RequestHeadersAdd(request, TraceContext.TraceParentHeaderName, TraceContext.BuildTraceparent(span.OutgoingDistributedTracingData));
}
if (transaction is Transaction t)
{
if (t.ConfigSnapshot.UseElasticTraceparentHeader)
{
if (!RequestHeadersContain(request, TraceContext.TraceParentHeaderNamePrefixed))
{
RequestHeadersAdd(request, TraceContext.TraceParentHeaderNamePrefixed,
TraceContext.BuildTraceparent(span.OutgoingDistributedTracingData));
}
}
}
if (!RequestHeadersContain(request, TraceContext.TraceStateHeaderName) && span.OutgoingDistributedTracingData != null && span.OutgoingDistributedTracingData.HasTraceState)
{
RequestHeadersAdd(request, TraceContext.TraceStateHeaderName, span.OutgoingDistributedTracingData.TraceState.ToTextHeader());
}
if (span is Span spanInstance)
{
if (!spanInstance.ShouldBeSentToApmServer)
{
return;
}
}
span.Context.Http = new Http {
Method = RequestGetMethod(request)
};
span.Context.Http.SetUrl(requestUrl);
}
private void ProcessStartEvent(TRequest request, Uri requestUrl)
{
if (_realAgent?.TracerInternal.CurrentSpan is Span currentSpan)
{
// if the current span is an exit span, don't create a span for the current request
if (currentSpan.InstrumentationFlag == InstrumentationFlag.Azure || currentSpan.InstrumentationFlag == InstrumentationFlag.Elasticsearch)
{
return;
}
}
Logger.Trace()?.Log("Processing start event... Request URL: {RequestUrl}", Http.Sanitize(requestUrl));
var transaction = ApmAgent.Tracer.CurrentTransaction;
if (transaction == null)
{
Logger.Debug()?.Log("No current transaction, skip creating span for outgoing HTTP request");
return;
}
var method = RequestGetMethod(request);
string HeaderGetter(string header) => RequestTryGetHeader(request, header, out var value) ? value : null;
ISpan span = null;
if (_configuration?.HasTracers ?? false)
{
using (var httpTracers = _configuration.GetTracers())
{
foreach (var httpSpanTracer in httpTracers)
{
if (httpSpanTracer.IsMatch(method, requestUrl, HeaderGetter))
{
span = httpSpanTracer.StartSpan(ApmAgent, method, requestUrl, HeaderGetter);
if (span != null)
{
break;
}
}
}
}
}
if (span is null)
{
if (_configuration?.CaptureSpan ?? false)
{
span = ExecutionSegmentCommon.StartSpanOnCurrentExecutionSegment(ApmAgent, $"{method} {requestUrl.Host}",
ApiConstants.TypeExternal, ApiConstants.SubtypeHttp, InstrumentationFlag.HttpClient, true);
if (span is null)
{
Logger.Trace()?.Log("Could not create span for outgoing HTTP request to {RequestUrl}", Http.Sanitize(requestUrl));
return;
}
}
else
{
Logger.Trace()?.Log("Skip creating span for outgoing HTTP request to {RequestUrl} as not to known service", Http.Sanitize(requestUrl));
return;
}
}
if (!ProcessingRequests.TryAdd(request, span))
{
// Consider improving error reporting - see https://github.com/elastic/apm-agent-dotnet/issues/280
Logger.Error()?.Log("Failed to add to ProcessingRequests - ???");
return;
}
if (!RequestHeadersContain(request, TraceContext.TraceParentHeaderName))
{
// We call TraceParent.BuildTraceparent explicitly instead of DistributedTracingData.SerializeToString because
// in the future we might change DistributedTracingData.SerializeToString to use some other internal format
// but here we want the string to be in W3C 'traceparent' header format.
RequestHeadersAdd(request, TraceContext.TraceParentHeaderName, TraceContext.BuildTraceparent(span.OutgoingDistributedTracingData));
}
if (transaction is Transaction t)
{
if (t.ConfigSnapshot.UseElasticTraceparentHeader)
{
if (!RequestHeadersContain(request, TraceContext.TraceParentHeaderNamePrefixed))
{
RequestHeadersAdd(request, TraceContext.TraceParentHeaderNamePrefixed,
TraceContext.BuildTraceparent(span.OutgoingDistributedTracingData));
}
}
}
if (!RequestHeadersContain(request, TraceContext.TraceStateHeaderName) && span.OutgoingDistributedTracingData != null && span.OutgoingDistributedTracingData.HasTraceState)
{
RequestHeadersAdd(request, TraceContext.TraceStateHeaderName, span.OutgoingDistributedTracingData.TraceState.ToTextHeader());
}
if (span is Span realSpan)
{
if (!realSpan.ShouldBeSentToApmServer)
{
return;
}
}
span.Context.Http = new Http {
Method = method
};
span.Context.Http.SetUrl(requestUrl);
}
/// <summary> /// Serializes this instance to a string. /// This method should be used at the caller side and the return value should be passed to the (possibly remote) callee /// side. /// <see cref="TryDeserializeFromString" /> should be used to deserialize the instance at the callee side. /// </summary> /// <returns> /// String containing the instance in serialized form. /// </returns> public string SerializeToString() => TraceContext.BuildTraceparent(this);
