forked from TrueCloudLab/neoneo-go
121 lines
3.5 KiB
Go
121 lines
3.5 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(b storage.Batch) error {
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buf := io.NewBufBinWriter()
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for hash, contract := range a {
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contract.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, hash.Bytes())
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b.Put(key, buf.Bytes())
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buf.Reset()
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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 (a *ContractState) DecodeBinary(br *io.BinReader) {
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a.Script = br.ReadBytes()
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paramBytes := br.ReadBytes()
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a.ParamList = make([]smartcontract.ParamType, len(paramBytes))
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for k := range paramBytes {
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a.ParamList[k] = smartcontract.ParamType(paramBytes[k])
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}
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br.ReadLE(&a.ReturnType)
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br.ReadLE(&a.Properties)
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a.Name = br.ReadString()
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a.CodeVersion = br.ReadString()
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a.Author = br.ReadString()
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a.Email = br.ReadString()
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a.Description = br.ReadString()
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a.createHash()
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}
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// EncodeBinary implements Serializable interface.
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func (a *ContractState) EncodeBinary(bw *io.BinWriter) {
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bw.WriteBytes(a.Script)
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bw.WriteVarUint(uint64(len(a.ParamList)))
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for k := range a.ParamList {
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bw.WriteLE(a.ParamList[k])
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}
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bw.WriteLE(a.ReturnType)
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bw.WriteLE(a.Properties)
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bw.WriteString(a.Name)
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bw.WriteString(a.CodeVersion)
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bw.WriteString(a.Author)
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bw.WriteString(a.Email)
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bw.WriteString(a.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().Bytes())
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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.Bytes())
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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 (a *ContractState) ScriptHash() util.Uint160 {
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if a.scriptHash.Equals(util.Uint160{}) {
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a.createHash()
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}
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return a.scriptHash
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}
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// createHash creates contract script hash.
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func (a *ContractState) createHash() {
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a.scriptHash = hash.Hash160(a.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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