package blockchain import ( "errors" "fmt" "github.com/gogo/protobuf/proto" bcproto "github.com/tendermint/tendermint/proto/blockchain" "github.com/tendermint/tendermint/types" ) const ( // NOTE: keep up to date with bcproto.BlockResponse BlockResponseMessagePrefixSize = 4 BlockResponseMessageFieldKeySize = 1 MaxMsgSize = types.MaxBlockSizeBytes + BlockResponseMessagePrefixSize + BlockResponseMessageFieldKeySize ) // EncodeMsg encodes a Protobuf message func EncodeMsg(pb proto.Message) ([]byte, error) { msg := bcproto.Message{} switch pb := pb.(type) { case *bcproto.BlockRequest: msg.Sum = &bcproto.Message_BlockRequest{BlockRequest: pb} case *bcproto.BlockResponse: msg.Sum = &bcproto.Message_BlockResponse{BlockResponse: pb} case *bcproto.NoBlockResponse: msg.Sum = &bcproto.Message_NoBlockResponse{NoBlockResponse: pb} case *bcproto.StatusRequest: msg.Sum = &bcproto.Message_StatusRequest{StatusRequest: pb} case *bcproto.StatusResponse: msg.Sum = &bcproto.Message_StatusResponse{StatusResponse: pb} default: return nil, fmt.Errorf("unknown message type %T", pb) } bz, err := proto.Marshal(&msg) if err != nil { return nil, fmt.Errorf("unable to marshal %T: %w", pb, err) } return bz, nil } // DecodeMsg decodes a Protobuf message. func DecodeMsg(bz []byte) (proto.Message, error) { pb := &bcproto.Message{} err := proto.Unmarshal(bz, pb) if err != nil { return nil, err } switch msg := pb.Sum.(type) { case *bcproto.Message_BlockRequest: return msg.BlockRequest, nil case *bcproto.Message_BlockResponse: return msg.BlockResponse, nil case *bcproto.Message_NoBlockResponse: return msg.NoBlockResponse, nil case *bcproto.Message_StatusRequest: return msg.StatusRequest, nil case *bcproto.Message_StatusResponse: return msg.StatusResponse, nil default: return nil, fmt.Errorf("unknown message type %T", msg) } } // ValidateMsg validates a message. func ValidateMsg(pb proto.Message) error { if pb == nil { return errors.New("message cannot be nil") } switch msg := pb.(type) { case *bcproto.BlockRequest: if msg.Height < 0 { return errors.New("negative Height") } case *bcproto.BlockResponse: _, err := types.BlockFromProto(msg.Block) if err != nil { return err } case *bcproto.NoBlockResponse: if msg.Height < 0 { return errors.New("negative Height") } case *bcproto.StatusResponse: if msg.Base < 0 { return errors.New("negative Base") } if msg.Height < 0 { return errors.New("negative Height") } if msg.Base > msg.Height { return fmt.Errorf("base %v cannot be greater than height %v", msg.Base, msg.Height) } case *bcproto.StatusRequest: if msg.Base < 0 { return errors.New("negative Base") } if msg.Height < 0 { return errors.New("negative Height") } if msg.Base > msg.Height { return fmt.Errorf("base %v cannot be greater than height %v", msg.Base, msg.Height) } default: return fmt.Errorf("unknown message type %T", msg) } return nil }