private ZipkinSpanContext GetOrCreateContext()
{
ulong spanId = GetRandomId();
// Only one reference is supported right now - the rest is ignored.
var parent = (ZipkinSpanContext)SpanReferences.FirstOrDefault()?.ReferencedContext;
if (parent != null)
{
return(parent.CreateChild(spanId));
}
else
{
// This is a root span!
bool sampled = false;
if (IntTags.Any(x => x.Key == Tags.SamplingPriority && x.Value == 1))
{
sampled = true;
}
else if (_tracer.Sampler.IsSampled(spanId))
{
sampled = true;
foreach (var tag in _tracer.Sampler.GetTags())
{
WithTag(tag.Key, tag.Value);
}
}
// TraceId and SpanId may be equal: http://zipkin.io/pages/instrumenting.html
return(new ZipkinSpanContext(spanId, spanId, parentId: null, sampled: sampled, baggage: null));
}
}
public int?GetIntTag(string key)
{
var kvp = IntTags.FirstOrDefault(x => string.Equals(x.Key, key));
return(kvp.Key == null ? (int?)null : kvp.Value);
}