Function SpanFromContext

blobstore/common/trace/tracer.go:257–264

SpanFromContext returns the `Span` previously associated with `ctx`, or `nil` if no such `Span` could be found.

(ctx context.Context)

// SpanFromContext returns the `Span` previously associated with `ctx`, or
// `nil` if no such `Span` could be found.
func SpanFromContext(ctx context.Context) Span {
	span := opentracing.SpanFromContext(ctx)
	s, ok := span.(Span)
	if !ok {
		return nil
	}
	return s
}

// SpanFromContextSafe returns the `Span` previously associated with `ctx`, or
// creates a root Span with name default.