neoneo-go/pkg/core/state/contract.go

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package state
import (
"github.com/CityOfZion/neo-go/pkg/crypto/hash"
"github.com/CityOfZion/neo-go/pkg/io"
"github.com/CityOfZion/neo-go/pkg/smartcontract"
"github.com/CityOfZion/neo-go/pkg/util"
)
// Contract holds information about a smart contract in the NEO blockchain.
type Contract struct {
Script []byte
ParamList []smartcontract.ParamType
ReturnType smartcontract.ParamType
Properties smartcontract.PropertyState
Name string
CodeVersion string
Author string
Email string
Description string
scriptHash util.Uint160
}
// DecodeBinary implements Serializable interface.
func (cs *Contract) DecodeBinary(br *io.BinReader) {
cs.Script = br.ReadVarBytes()
br.ReadArray(&cs.ParamList)
cs.ReturnType = smartcontract.ParamType(br.ReadB())
cs.Properties = smartcontract.PropertyState(br.ReadB())
cs.Name = br.ReadString()
cs.CodeVersion = br.ReadString()
cs.Author = br.ReadString()
cs.Email = br.ReadString()
cs.Description = br.ReadString()
cs.createHash()
}
// EncodeBinary implements Serializable interface.
func (cs *Contract) EncodeBinary(bw *io.BinWriter) {
bw.WriteVarBytes(cs.Script)
bw.WriteArray(cs.ParamList)
bw.WriteB(byte(cs.ReturnType))
bw.WriteB(byte(cs.Properties))
bw.WriteString(cs.Name)
bw.WriteString(cs.CodeVersion)
bw.WriteString(cs.Author)
bw.WriteString(cs.Email)
bw.WriteString(cs.Description)
}
// ScriptHash returns a contract script hash.
func (cs *Contract) ScriptHash() util.Uint160 {
if cs.scriptHash.Equals(util.Uint160{}) {
cs.createHash()
}
return cs.scriptHash
}
// createHash creates contract script hash.
func (cs *Contract) createHash() {
cs.scriptHash = hash.Hash160(cs.Script)
}
// HasStorage checks whether the contract has storage property set.
func (cs *Contract) HasStorage() bool {
return (cs.Properties & smartcontract.HasStorage) != 0
}
// HasDynamicInvoke checks whether the contract has dynamic invoke property set.
func (cs *Contract) HasDynamicInvoke() bool {
return (cs.Properties & smartcontract.HasDynamicInvoke) != 0
}
// IsPayable checks whether the contract has payable property set.
func (cs *Contract) IsPayable() bool {
return (cs.Properties & smartcontract.IsPayable) != 0
}