358 lines
10 KiB
Go
358 lines
10 KiB
Go
package core
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import (
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"bytes"
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"errors"
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"fmt"
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"sort"
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"github.com/nspcc-dev/neo-go/pkg/core/interop"
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"github.com/nspcc-dev/neo-go/pkg/core/state"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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const (
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// MaxContractDescriptionLen is the maximum length for contract description.
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MaxContractDescriptionLen = 65536
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// MaxContractScriptSize is the maximum script size for a contract.
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MaxContractScriptSize = 1024 * 1024
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// MaxContractParametersNum is the maximum number of parameters for a contract.
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MaxContractParametersNum = 252
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// MaxContractStringLen is the maximum length for contract metadata strings.
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MaxContractStringLen = 252
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)
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// headerGetVersion returns version from the header.
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func headerGetVersion(ic *interop.Context, v *vm.VM) error {
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header, err := popHeaderFromVM(v)
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if err != nil {
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return err
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}
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v.Estack().PushVal(header.Version)
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return nil
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}
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// headerGetMerkleRoot returns version from the header.
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func headerGetMerkleRoot(ic *interop.Context, v *vm.VM) error {
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header, err := popHeaderFromVM(v)
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if err != nil {
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return err
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}
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v.Estack().PushVal(header.MerkleRoot.BytesBE())
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return nil
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}
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// headerGetNextConsensus returns version from the header.
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func headerGetNextConsensus(ic *interop.Context, v *vm.VM) error {
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header, err := popHeaderFromVM(v)
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if err != nil {
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return err
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}
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v.Estack().PushVal(header.NextConsensus.BytesBE())
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return nil
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}
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// txGetAttributes returns current transaction attributes.
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func txGetAttributes(ic *interop.Context, v *vm.VM) error {
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txInterface := v.Estack().Pop().Value()
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tx, ok := txInterface.(*transaction.Transaction)
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if !ok {
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return errors.New("value is not a transaction")
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}
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if len(tx.Attributes) > vm.MaxArraySize {
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return errors.New("too many attributes")
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}
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attrs := make([]stackitem.Item, 0, len(tx.Attributes))
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for i := range tx.Attributes {
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attrs = append(attrs, stackitem.NewInterop(&tx.Attributes[i]))
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}
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v.Estack().PushVal(attrs)
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return nil
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}
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// txGetWitnesses returns current transaction witnesses.
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func txGetWitnesses(ic *interop.Context, v *vm.VM) error {
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txInterface := v.Estack().Pop().Value()
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tx, ok := txInterface.(*transaction.Transaction)
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if !ok {
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return errors.New("value is not a transaction")
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}
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if len(tx.Scripts) > vm.MaxArraySize {
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return errors.New("too many outputs")
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}
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scripts := make([]stackitem.Item, 0, len(tx.Scripts))
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for i := range tx.Scripts {
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scripts = append(scripts, stackitem.NewInterop(&tx.Scripts[i]))
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}
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v.Estack().PushVal(scripts)
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return nil
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}
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// witnessGetVerificationScript returns current witness' script.
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func witnessGetVerificationScript(ic *interop.Context, v *vm.VM) error {
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witInterface := v.Estack().Pop().Value()
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wit, ok := witInterface.(*transaction.Witness)
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if !ok {
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return errors.New("value is not a witness")
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}
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// It's important not to share wit.VerificationScript slice with the code running in VM.
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script := make([]byte, len(wit.VerificationScript))
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copy(script, wit.VerificationScript)
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v.Estack().PushVal(script)
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return nil
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}
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// attrGetData returns tx attribute data.
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func attrGetData(ic *interop.Context, v *vm.VM) error {
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attrInterface := v.Estack().Pop().Value()
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attr, ok := attrInterface.(*transaction.Attribute)
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if !ok {
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return fmt.Errorf("%T is not an attribute", attr)
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}
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v.Estack().PushVal(attr.Data)
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return nil
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}
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// attrGetData returns tx attribute usage field.
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func attrGetUsage(ic *interop.Context, v *vm.VM) error {
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attrInterface := v.Estack().Pop().Value()
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attr, ok := attrInterface.(*transaction.Attribute)
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if !ok {
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return fmt.Errorf("%T is not an attribute", attr)
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}
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v.Estack().PushVal(int(attr.Usage))
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return nil
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}
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// bcGetAccount returns or creates an account.
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func bcGetAccount(ic *interop.Context, v *vm.VM) error {
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accbytes := v.Estack().Pop().Bytes()
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acchash, err := util.Uint160DecodeBytesBE(accbytes)
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if err != nil {
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return err
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}
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acc, err := ic.DAO.GetAccountStateOrNew(acchash)
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if err != nil {
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return err
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}
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v.Estack().PushVal(stackitem.NewInterop(acc))
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return nil
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}
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// accountGetBalance returns balance for a given account.
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func accountGetBalance(ic *interop.Context, v *vm.VM) error {
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accInterface := v.Estack().Pop().Value()
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acc, ok := accInterface.(*state.Account)
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if !ok {
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return fmt.Errorf("%T is not an account state", acc)
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}
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asbytes := v.Estack().Pop().Bytes()
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ashash, err := util.Uint256DecodeBytesBE(asbytes)
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if err != nil {
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return err
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}
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balance, ok := acc.GetBalanceValues()[ashash]
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if !ok {
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balance = util.Fixed8(0)
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}
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v.Estack().PushVal(int64(balance))
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return nil
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}
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// accountGetScriptHash returns script hash of a given account.
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func accountGetScriptHash(ic *interop.Context, v *vm.VM) error {
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accInterface := v.Estack().Pop().Value()
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acc, ok := accInterface.(*state.Account)
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if !ok {
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return fmt.Errorf("%T is not an account state", acc)
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}
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v.Estack().PushVal(acc.ScriptHash.BytesBE())
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return nil
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}
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// accountIsStandard checks whether given account is standard.
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func accountIsStandard(ic *interop.Context, v *vm.VM) error {
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accbytes := v.Estack().Pop().Bytes()
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acchash, err := util.Uint160DecodeBytesBE(accbytes)
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if err != nil {
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return err
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}
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contract, err := ic.DAO.GetContractState(acchash)
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res := err != nil || vm.IsStandardContract(contract.Script)
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v.Estack().PushVal(res)
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return nil
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}
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// storageFind finds stored key-value pair.
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func storageFind(ic *interop.Context, v *vm.VM) error {
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stcInterface := v.Estack().Pop().Value()
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stc, ok := stcInterface.(*StorageContext)
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if !ok {
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return fmt.Errorf("%T is not a StorageContext", stcInterface)
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}
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err := checkStorageContext(ic, stc)
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if err != nil {
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return err
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}
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prefix := v.Estack().Pop().Bytes()
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siMap, err := ic.DAO.GetStorageItemsWithPrefix(stc.ScriptHash, prefix)
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if err != nil {
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return err
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}
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filteredMap := stackitem.NewMap()
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for k, v := range siMap {
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filteredMap.Add(stackitem.NewByteArray(append(prefix, []byte(k)...)), stackitem.NewByteArray(v.Value))
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}
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sort.Slice(filteredMap.Value().([]stackitem.MapElement), func(i, j int) bool {
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return bytes.Compare(filteredMap.Value().([]stackitem.MapElement)[i].Key.Value().([]byte),
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filteredMap.Value().([]stackitem.MapElement)[j].Key.Value().([]byte)) == -1
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})
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item := vm.NewMapIterator(filteredMap)
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v.Estack().PushVal(item)
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return nil
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}
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// createContractStateFromVM pops all contract state elements from the VM
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// evaluation stack, does a lot of checks and returns Contract if it
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// succeeds.
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func createContractStateFromVM(ic *interop.Context, v *vm.VM) (*state.Contract, error) {
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if ic.Trigger != trigger.Application {
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return nil, errors.New("can't create contract when not triggered by an application")
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}
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script := v.Estack().Pop().Bytes()
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if len(script) > MaxContractScriptSize {
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return nil, errors.New("the script is too big")
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}
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paramBytes := v.Estack().Pop().Bytes()
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if len(paramBytes) > MaxContractParametersNum {
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return nil, errors.New("too many parameters for a script")
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}
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paramList := make([]smartcontract.ParamType, len(paramBytes))
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for k, v := range paramBytes {
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paramList[k] = smartcontract.ParamType(v)
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}
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retType := smartcontract.ParamType(v.Estack().Pop().BigInt().Int64())
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properties := smartcontract.PropertyState(v.Estack().Pop().BigInt().Int64())
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name := v.Estack().Pop().Bytes()
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if len(name) > MaxContractStringLen {
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return nil, errors.New("too big name")
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}
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version := v.Estack().Pop().Bytes()
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if len(version) > MaxContractStringLen {
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return nil, errors.New("too big version")
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}
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author := v.Estack().Pop().Bytes()
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if len(author) > MaxContractStringLen {
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return nil, errors.New("too big author")
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}
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email := v.Estack().Pop().Bytes()
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if len(email) > MaxContractStringLen {
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return nil, errors.New("too big email")
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}
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desc := v.Estack().Pop().Bytes()
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if len(desc) > MaxContractDescriptionLen {
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return nil, errors.New("too big description")
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}
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contract := &state.Contract{
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Script: script,
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ParamList: paramList,
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ReturnType: retType,
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Properties: properties,
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Name: string(name),
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CodeVersion: string(version),
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Author: string(author),
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Email: string(email),
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Description: string(desc),
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}
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return contract, nil
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}
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// contractCreate creates a contract.
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func contractCreate(ic *interop.Context, v *vm.VM) error {
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newcontract, err := createContractStateFromVM(ic, v)
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if err != nil {
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return err
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}
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contract, err := ic.DAO.GetContractState(newcontract.ScriptHash())
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if err != nil {
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contract = newcontract
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err := ic.DAO.PutContractState(contract)
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if err != nil {
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return err
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}
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}
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v.Estack().PushVal(stackitem.NewInterop(contract))
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return nil
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}
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// contractGetScript returns a script associated with a contract.
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func contractGetScript(ic *interop.Context, v *vm.VM) error {
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csInterface := v.Estack().Pop().Value()
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cs, ok := csInterface.(*state.Contract)
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if !ok {
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return fmt.Errorf("%T is not a contract state", cs)
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}
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v.Estack().PushVal(cs.Script)
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return nil
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}
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// contractIsPayable returns whether contract is payable.
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func contractIsPayable(ic *interop.Context, v *vm.VM) error {
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csInterface := v.Estack().Pop().Value()
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cs, ok := csInterface.(*state.Contract)
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if !ok {
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return fmt.Errorf("%T is not a contract state", cs)
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}
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v.Estack().PushVal(cs.IsPayable())
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return nil
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}
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// contractMigrate migrates a contract.
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func contractMigrate(ic *interop.Context, v *vm.VM) error {
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newcontract, err := createContractStateFromVM(ic, v)
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if err != nil {
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return err
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}
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contract, err := ic.DAO.GetContractState(newcontract.ScriptHash())
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if err != nil {
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contract = newcontract
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err := ic.DAO.PutContractState(contract)
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if err != nil {
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return err
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}
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if contract.HasStorage() {
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hash := v.GetCurrentScriptHash()
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siMap, err := ic.DAO.GetStorageItems(hash)
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if err != nil {
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return err
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}
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for k, v := range siMap {
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v.IsConst = false
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err = ic.DAO.PutStorageItem(contract.ScriptHash(), []byte(k), v)
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if err != nil {
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return err
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}
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}
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}
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}
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v.Estack().PushVal(stackitem.NewInterop(contract))
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return contractDestroy(ic, v)
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}
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// runtimeSerialize serializes top stack item into a ByteArray.
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func runtimeSerialize(_ *interop.Context, v *vm.VM) error {
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return vm.RuntimeSerialize(v)
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}
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// runtimeDeserialize deserializes ByteArray from a stack into an item.
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func runtimeDeserialize(_ *interop.Context, v *vm.VM) error {
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return vm.RuntimeDeserialize(v)
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}
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