Function FromError

status/status.go:96–127

FromError returns a Status representation of err. - If err was produced by this package or implements the method `GRPCStatus() *Status` and `GRPCStatus()` does not return nil, or if err wraps a type satisfying this, the Status from `GRPCStatus()` is returned. For wrapped errors, the message return

(err error)

//     case, a Status is returned with codes.Unknown and err's Error() message,
//     and ok is false.
func FromError(err error) (s *Status, ok bool) {
	if err == nil {
		return nil, true
	}
	type grpcstatus interface{ GRPCStatus() *Status }
	if gs, ok := err.(grpcstatus); ok {
		grpcStatus := gs.GRPCStatus()
		if grpcStatus == nil {
			// Error has status nil, which maps to codes.OK. There
			// is no sensible behavior for this, so we turn it into
			// an error with codes.Unknown and discard the existing
			// status.
			return New(codes.Unknown, err.Error()), false
		}
		return grpcStatus, true
	}
	var gs grpcstatus
	if errors.As(err, &gs) {
		grpcStatus := gs.GRPCStatus()
		if grpcStatus == nil {
			// Error wraps an error that has status nil, which maps
			// to codes.OK.  There is no sensible behavior for this,
			// so we turn it into an error with codes.Unknown and
			// discard the existing status.
			return New(codes.Unknown, err.Error()), false
		}
		p := grpcStatus.Proto()
		p.Message = err.Error()
		return status.FromProto(p), true
	}
	return New(codes.Unknown, err.Error()), false
}

// Convert is a convenience function which removes the need to handle the
// boolean return value from FromError.