126 lines
3.3 KiB
Go
126 lines
3.3 KiB
Go
package state
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import (
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"errors"
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"math"
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"math/big"
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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/manifest"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/nef"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm/emit"
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"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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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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ContractBase
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UpdateCounter uint16 `json:"updatecounter"`
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}
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// ContractBase represents a part shared by native and user-deployed contracts.
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type ContractBase struct {
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ID int32 `json:"id"`
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Hash util.Uint160 `json:"hash"`
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NEF nef.File `json:"nef"`
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Manifest manifest.Manifest `json:"manifest"`
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}
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// NativeContract holds information about the native contract.
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type NativeContract struct {
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ContractBase
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UpdateHistory []uint32 `json:"updatehistory"`
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}
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// ToStackItem converts state.Contract to stackitem.Item.
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func (c *Contract) ToStackItem() (stackitem.Item, error) {
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rawNef, err := c.NEF.Bytes()
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if err != nil {
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return nil, err
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}
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m, err := c.Manifest.ToStackItem()
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if err != nil {
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return nil, err
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}
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return stackitem.NewArray([]stackitem.Item{
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stackitem.Make(c.ID),
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stackitem.Make(c.UpdateCounter),
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stackitem.NewByteArray(c.Hash.BytesBE()),
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stackitem.NewByteArray(rawNef),
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m,
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}), nil
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}
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// FromStackItem fills Contract's data from the given stack itemized contract
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// representation.
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func (c *Contract) FromStackItem(item stackitem.Item) error {
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arr, ok := item.Value().([]stackitem.Item)
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if !ok {
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return errors.New("not an array")
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}
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if len(arr) != 5 {
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return errors.New("invalid structure")
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}
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bi, ok := arr[0].Value().(*big.Int)
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if !ok {
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return errors.New("ID is not an integer")
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}
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if !bi.IsInt64() || bi.Int64() > math.MaxInt32 || bi.Int64() < math.MinInt32 {
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return errors.New("ID not in int32 range")
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}
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c.ID = int32(bi.Int64())
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bi, ok = arr[1].Value().(*big.Int)
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if !ok {
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return errors.New("UpdateCounter is not an integer")
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}
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if !bi.IsUint64() || bi.Uint64() > math.MaxUint16 {
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return errors.New("UpdateCounter not in uint16 range")
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}
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c.UpdateCounter = uint16(bi.Uint64())
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bytes, err := arr[2].TryBytes()
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if err != nil {
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return err
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}
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c.Hash, err = util.Uint160DecodeBytesBE(bytes)
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if err != nil {
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return err
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}
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bytes, err = arr[3].TryBytes()
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if err != nil {
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return err
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}
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c.NEF, err = nef.FileFromBytes(bytes)
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if err != nil {
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return err
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}
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m := new(manifest.Manifest)
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err = m.FromStackItem(arr[4])
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if err != nil {
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return err
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}
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c.Manifest = *m
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return nil
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}
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// CreateContractHash creates a deployed contract hash from the transaction sender
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// and the contract script.
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func CreateContractHash(sender util.Uint160, checksum uint32, name string) util.Uint160 {
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w := io.NewBufBinWriter()
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emit.Opcodes(w.BinWriter, opcode.ABORT)
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emit.Bytes(w.BinWriter, sender.BytesBE())
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emit.Int(w.BinWriter, int64(checksum))
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emit.String(w.BinWriter, name)
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if w.Err != nil {
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panic(w.Err)
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}
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return hash.Hash160(w.Bytes())
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}
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// CreateNativeContractHash calculates the hash for the native contract with the
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// given name.
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func CreateNativeContractHash(name string) util.Uint160 {
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return CreateContractHash(util.Uint160{}, 0, name)
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}
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