neo-go/pkg/core/contract_state.go

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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()
br.ReadArray(&cs.ParamList)
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.WriteVarBytes(cs.Script)
bw.WriteArray(cs.ParamList)
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
}