public static void SetTraceparent(this Activity activity, string value)
{
if (activity.IsW3CActivity())
{
return;
}
// we only support 00 version and ignore caller version
activity.SetVersion(W3CConstants.DefaultVersion);
string traceId = null, parentSpanId = null, sampledStr = null;
bool isValid = false;
var parts = value?.Split('-');
if (parts != null && parts.Length == 4)
{
traceId = parts[1];
parentSpanId = parts[2];
sampledStr = parts[3];
isValid = TraceIdRegex.IsMatch(traceId) && SpanIdRegex.IsMatch(parentSpanId);
}
if (isValid)
{
byte.TryParse(sampledStr, NumberStyles.HexNumber, CultureInfo.InvariantCulture, out var sampled);
// we always defer sampling
if ((sampled & W3CConstants.RequestedTraceFlag) == W3CConstants.RequestedTraceFlag)
{
activity.SetSampled(W3CConstants.TraceFlagRecordedAndRequested);
}
else
{
activity.SetSampled(W3CConstants.TraceFlagRecordedAndNotRequested);
}
activity.SetParentSpanId(parentSpanId);
activity.SetSpanId(W3CUtilities.GenerateSpanId());
activity.SetTraceId(traceId);
}
else
{
activity.SetSampled(W3CConstants.TraceFlagRecordedAndNotRequested);
activity.SetSpanId(W3CUtilities.GenerateSpanId());
activity.SetTraceId(W3CUtilities.GenerateTraceId());
}
if (activity.Id == null)
{
// activity is not started yet
activity.SetParentId(string.Concat("|", activity.GetTraceId(), ".", activity.GetParentSpanId(), "."));
}
}
public static Activity GenerateW3CContext(this Activity activity)
{
activity.SetVersion(W3CConstants.DefaultVersion);
activity.SetSampled(W3CConstants.TraceFlagRecordedAndNotRequested);
activity.SetSpanId(W3CUtilities.GenerateSpanId());
activity.SetTraceId(activity.RootId != null && TraceIdRegex.IsMatch(activity.RootId)
? activity.RootId
: W3CUtilities.GenerateTraceId());
return(activity);
}
private static Activity UpdateContextFromParent(this Activity activity)
{
if (activity != null && activity.Tags.All(t => t.Key != W3CConstants.TraceIdTag))
{
if (activity.Parent == null)
{
activity.GenerateW3CContext();
}
else
{
foreach (var tag in activity.Parent.Tags)
{
switch (tag.Key)
{
case W3CConstants.TraceIdTag:
activity.SetTraceId(tag.Value);
break;
case W3CConstants.SpanIdTag:
activity.SetParentSpanId(tag.Value);
activity.SetSpanId(W3CUtilities.GenerateSpanId());
break;
case W3CConstants.VersionTag:
activity.SetVersion(tag.Value);
break;
case W3CConstants.SampledTag:
activity.SetSampled(tag.Value);
break;
case W3CConstants.TracestateTag:
activity.SetTracestate(tag.Value);
break;
}
}
}
}
return(activity);
}
