本文整理汇总了Golang中github.com/opentracing/opentracing-go.Tracer.Extract方法的典型用法代码示例。如果您正苦于以下问题：Golang Tracer.Extract方法的具体用法？Golang Tracer.Extract怎么用？Golang Tracer.Extract使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类github.com/opentracing/opentracing-go.Tracer的用法示例。
在下文中一共展示了Tracer.Extract方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: JoinOrNew
// 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
}示例2: JoinOrNew
// 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
}