package message import ( "fmt" "github.com/nspcc-dev/neofs-api-go/rpc/grpc" ) // Message represents raw Protobuf message // that can be transmitted via several // transport protocols. type Message interface { // Must return gRPC message that can // be used for gRPC protocol transmission. ToGRPCMessage() grpc.Message // Must restore the message from related // gRPC message. // // If gRPC message is not a related one, // ErrUnexpectedMessageType can be returned // to indicate this. FromGRPCMessage(grpc.Message) error } // ErrUnexpectedMessageType is an error that // is used to indicate message mismatch. type ErrUnexpectedMessageType struct { exp, act interface{} } // NewUnexpectedMessageType initializes an error about message mismatch // between act and exp. func NewUnexpectedMessageType(act, exp interface{}) ErrUnexpectedMessageType { return ErrUnexpectedMessageType{ exp: exp, act: act, } } func (e ErrUnexpectedMessageType) Error() string { return fmt.Sprintf("unexpected message type %T: expected %T", e.act, e.exp) }