// JoinOrNew creates a new Span joined to the provided DelegatingCarrier or
// creates Span from the given tracer.
func JoinOrNew(tr opentracing.Tracer, carrier *Span, opName string) (opentracing.Span, error) {
if carrier != nil {
wireContext, err := tr.Extract(basictracer.Delegator, carrier)
switch err {
case nil:
sp := tr.StartSpan(opName, opentracing.FollowsFrom(wireContext))
sp.LogEvent(opName)
return sp, nil
case opentracing.ErrSpanContextNotFound:
default:
return nil, err
}
}
return tr.StartSpan(opName), nil
}
// JoinOrNew creates a new Span joined to the provided DelegatingCarrier or
// creates Span from the given tracer.
func JoinOrNew(
tr opentracing.Tracer, carrier *SpanContextCarrier, opName string,
) (opentracing.Span, error) {
if carrier != nil {
wireContext, err := tr.Extract(basictracer.Delegator, carrier)
switch err {
case nil:
sp := tr.StartSpan(opName, opentracing.FollowsFrom(wireContext))
// Copy baggage items to tags so they show up in the Lightstep UI.
sp.Context().ForeachBaggageItem(func(k, v string) bool { sp.SetTag(k, v); return true })
sp.LogFields(otlog.String("event", opName))
return sp, nil
case opentracing.ErrSpanContextNotFound:
default:
return nil, err
}
}
return tr.StartSpan(opName), nil
}