package core import ( "github.com/CityOfZion/neo-go/pkg/core/storage" "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" ) // Contracts is a mapping between scripthash and ContractState. type Contracts map[util.Uint160]*ContractState // ContractState holds information about a smart contract in the NEO blockchain. type ContractState 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 } // commit flushes all contracts to the given storage.Batch. func (a Contracts) commit(store storage.Store) error { for _, contract := range a { if err := putContractStateIntoStore(store, contract); err != nil { return err } } return nil } // DecodeBinary implements Serializable interface. func (cs *ContractState) DecodeBinary(br *io.BinReader) { cs.Script = br.ReadBytes() paramBytes := br.ReadBytes() cs.ParamList = make([]smartcontract.ParamType, len(paramBytes)) for k := range paramBytes { cs.ParamList[k] = smartcontract.ParamType(paramBytes[k]) } br.ReadLE(&cs.ReturnType) br.ReadLE(&cs.Properties) 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 *ContractState) EncodeBinary(bw *io.BinWriter) { bw.WriteBytes(cs.Script) bw.WriteVarUint(uint64(len(cs.ParamList))) for k := range cs.ParamList { bw.WriteLE(cs.ParamList[k]) } bw.WriteLE(cs.ReturnType) bw.WriteLE(cs.Properties) bw.WriteString(cs.Name) bw.WriteString(cs.CodeVersion) bw.WriteString(cs.Author) bw.WriteString(cs.Email) bw.WriteString(cs.Description) } // putContractStateIntoStore puts given contract state into the given store. func putContractStateIntoStore(s storage.Store, cs *ContractState) error { buf := io.NewBufBinWriter() cs.EncodeBinary(buf.BinWriter) if buf.Err != nil { return buf.Err } key := storage.AppendPrefix(storage.STContract, cs.ScriptHash().Bytes()) return s.Put(key, buf.Bytes()) } // deleteContractStateInStore deletes given contract state in the given store. func deleteContractStateInStore(s storage.Store, hash util.Uint160) error { key := storage.AppendPrefix(storage.STContract, hash.Bytes()) return s.Delete(key) } // ScriptHash returns a contract script hash. func (cs *ContractState) ScriptHash() util.Uint160 { if cs.scriptHash.Equals(util.Uint160{}) { cs.createHash() } return cs.scriptHash } // createHash creates contract script hash. func (cs *ContractState) createHash() { cs.scriptHash = hash.Hash160(cs.Script) } // HasStorage checks whether the contract has storage property set. func (cs *ContractState) HasStorage() bool { return (cs.Properties & smartcontract.HasStorage) != 0 } // HasDynamicInvoke checks whether the contract has dynamic invoke property set. func (cs *ContractState) HasDynamicInvoke() bool { return (cs.Properties & smartcontract.HasDynamicInvoke) != 0 } // IsPayable checks whether the contract has payable property set. func (cs *ContractState) IsPayable() bool { return (cs.Properties & smartcontract.IsPayable) != 0 }