package transaction import ( "errors" "math/rand" "github.com/nspcc-dev/neo-go/pkg/io" "github.com/nspcc-dev/neo-go/pkg/util" ) // InvocationTX represents a invocation transaction and is used to // deploy smart contract to the NEO blockchain. type InvocationTX struct { // Script output of the smart contract. Script []byte // Gas cost of the smart contract. Gas util.Fixed8 Version uint8 } // NewInvocationTX returns a new invocation transaction. func NewInvocationTX(script []byte, gas util.Fixed8) *Transaction { return &Transaction{ Type: InvocationType, Version: 1, Nonce: rand.Uint32(), Data: &InvocationTX{ Script: script, Gas: gas, Version: 1, }, Attributes: []Attribute{}, Inputs: []Input{}, Outputs: []Output{}, Scripts: []Witness{}, } } // DecodeBinary implements Serializable interface. func (tx *InvocationTX) DecodeBinary(br *io.BinReader) { tx.Script = br.ReadVarBytes() if br.Err == nil && len(tx.Script) == 0 { br.Err = errors.New("no script") return } if tx.Version >= 1 { tx.Gas.DecodeBinary(br) if br.Err == nil && tx.Gas.LessThan(0) { br.Err = errors.New("negative gas") return } } else { tx.Gas = util.Fixed8FromInt64(0) } } // EncodeBinary implements Serializable interface. func (tx *InvocationTX) EncodeBinary(bw *io.BinWriter) { bw.WriteVarBytes(tx.Script) if tx.Version >= 1 { tx.Gas.EncodeBinary(bw) } }