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