mirror of
https://github.com/nspcc-dev/neo-go.git
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91 lines
2.3 KiB
Go
91 lines
2.3 KiB
Go
package state
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import (
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"encoding/json"
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"errors"
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"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
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"github.com/nspcc-dev/neo-go/pkg/io"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
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"github.com/nspcc-dev/neo-go/pkg/util"
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)
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// Contract holds information about a smart contract in the NEO blockchain.
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type Contract struct {
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ID int32
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Script []byte
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Manifest manifest.Manifest
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scriptHash util.Uint160
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}
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// DecodeBinary implements Serializable interface.
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func (cs *Contract) DecodeBinary(br *io.BinReader) {
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cs.ID = int32(br.ReadU32LE())
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cs.Script = br.ReadVarBytes()
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cs.Manifest.DecodeBinary(br)
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cs.createHash()
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}
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// EncodeBinary implements Serializable interface.
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func (cs *Contract) EncodeBinary(bw *io.BinWriter) {
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bw.WriteU32LE(uint32(cs.ID))
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bw.WriteVarBytes(cs.Script)
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cs.Manifest.EncodeBinary(bw)
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}
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// ScriptHash returns a contract script hash.
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func (cs *Contract) 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 *Contract) 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 *Contract) HasStorage() bool {
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return (cs.Manifest.Features & smartcontract.HasStorage) != 0
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}
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// IsPayable checks whether the contract has payable property set.
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func (cs *Contract) IsPayable() bool {
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return (cs.Manifest.Features & smartcontract.IsPayable) != 0
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}
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type contractJSON struct {
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ID int32 `json:"id"`
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Script []byte `json:"script"`
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Manifest *manifest.Manifest `json:"manifest"`
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ScriptHash util.Uint160 `json:"hash"`
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}
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// MarshalJSON implements json.Marshaler.
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func (cs *Contract) MarshalJSON() ([]byte, error) {
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return json.Marshal(&contractJSON{
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ID: cs.ID,
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Script: cs.Script,
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Manifest: &cs.Manifest,
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ScriptHash: cs.ScriptHash(),
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})
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}
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// UnmarshalJSON implements json.Unmarshaler.
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func (cs *Contract) UnmarshalJSON(data []byte) error {
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var cj contractJSON
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if err := json.Unmarshal(data, &cj); err != nil {
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return err
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} else if cj.Manifest == nil {
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return errors.New("empty manifest")
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}
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cs.ID = cj.ID
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cs.Script = cj.Script
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cs.Manifest = *cj.Manifest
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cs.createHash()
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return nil
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}
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