Function Cause

errors.go:275–288

Cause returns the underlying cause of the error, if possible. An error value has a cause if it implements the following interface: type causer interface { Cause() error } If the error does not implement Cause, the original error will be returned. If the error is nil, nil will be returned without f

(err error)

// be returned. If the error is nil, nil will be returned without further
// investigation.
func Cause(err error) error {
	type causer interface {
		Cause() error
	}

	for err != nil {
		cause, ok := err.(causer)
		if !ok {
			break
		}
		err = cause.Cause()
	}
	return err
}