func Span()

in pkg/tracing/transaction.go [51:78]

• 20 lines of code
• 5 McCabe index (conditional complexity)

func Span(ctx *context.Context) func() {
	if apm.TransactionFromContext(*ctx) == nil {
		// no transaction in the context implicates disabled tracing, exiting early to avoid unnecessary work
		return func() {}
	}

	pc, _, _, ok := runtime.Caller(1)

	name := "unknown_function"
	if ok {
		f := runtime.FuncForPC(pc)
		name = f.Name()
		// cut module and package name, leave only func name

		lastDot := strings.LastIndex(name, ".")
		// if something went wrong and dot is not present or last, let's not crash the operator and use full name instead
		if 0 <= lastDot && lastDot < len(name)-1 {
			name = name[lastDot+1:]
		}
	}

	span, newCtx := apm.StartSpan(*ctx, name, "app")
	*ctx = newCtx

	return func() {
		span.End()
	}
}