neoneo-go/pkg/core/interop_neo.go

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package core
import (
"errors"
"fmt"
"math"
"github.com/CityOfZion/neo-go/pkg/core/state"
"github.com/CityOfZion/neo-go/pkg/core/transaction"
"github.com/CityOfZion/neo-go/pkg/crypto/keys"
"github.com/CityOfZion/neo-go/pkg/smartcontract"
"github.com/CityOfZion/neo-go/pkg/smartcontract/trigger"
"github.com/CityOfZion/neo-go/pkg/util"
"github.com/CityOfZion/neo-go/pkg/vm"
gherr "github.com/pkg/errors"
)
const (
// MaxContractScriptSize is the maximum script size for a contract.
MaxContractScriptSize = 1024 * 1024
// MaxContractParametersNum is the maximum number of parameters for a contract.
MaxContractParametersNum = 252
// MaxContractStringLen is the maximum length for contract metadata strings.
MaxContractStringLen = 252
// MaxAssetNameLen is the maximum length of asset name.
MaxAssetNameLen = 1024
// MaxAssetPrecision is the maximum precision of asset.
MaxAssetPrecision = 8
// BlocksPerYear is a multiplier for asset renewal.
BlocksPerYear = 2000000
// DefaultAssetLifetime is the default lifetime of an asset (which differs
// from assets created by register tx).
DefaultAssetLifetime = 1 + BlocksPerYear
)
// txInOut is used to pushed one key-value pair from References() onto the stack.
type txInOut struct {
in transaction.Input
out transaction.Output
}
// headerGetVersion returns version from the header.
func (ic *interopContext) headerGetVersion(v *vm.VM) error {
header, err := popHeaderFromVM(v)
if err != nil {
return err
}
v.Estack().PushVal(header.Version)
return nil
}
// headerGetConsensusData returns consensus data from the header.
func (ic *interopContext) headerGetConsensusData(v *vm.VM) error {
header, err := popHeaderFromVM(v)
if err != nil {
return err
}
v.Estack().PushVal(header.ConsensusData)
return nil
}
// headerGetMerkleRoot returns version from the header.
func (ic *interopContext) headerGetMerkleRoot(v *vm.VM) error {
header, err := popHeaderFromVM(v)
if err != nil {
return err
}
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v.Estack().PushVal(header.MerkleRoot.BytesLE())
return nil
}
// headerGetNextConsensus returns version from the header.
func (ic *interopContext) headerGetNextConsensus(v *vm.VM) error {
header, err := popHeaderFromVM(v)
if err != nil {
return err
}
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v.Estack().PushVal(header.NextConsensus.BytesLE())
return nil
}
// txGetAttributes returns current transaction attributes.
func (ic *interopContext) txGetAttributes(v *vm.VM) error {
txInterface := v.Estack().Pop().Value()
tx, ok := txInterface.(*transaction.Transaction)
if !ok {
return errors.New("value is not a transaction")
}
if len(tx.Attributes) > vm.MaxArraySize {
return errors.New("too many attributes")
}
attrs := make([]vm.StackItem, 0, len(tx.Attributes))
for i := range tx.Attributes {
attrs = append(attrs, vm.NewInteropItem(&tx.Attributes[i]))
}
v.Estack().PushVal(attrs)
return nil
}
// txGetInputs returns current transaction inputs.
func (ic *interopContext) txGetInputs(v *vm.VM) error {
txInterface := v.Estack().Pop().Value()
tx, ok := txInterface.(*transaction.Transaction)
if !ok {
return errors.New("value is not a transaction")
}
if len(tx.Inputs) > vm.MaxArraySize {
return errors.New("too many inputs")
}
inputs := make([]vm.StackItem, 0, len(tx.Inputs))
for i := range tx.Inputs {
inputs = append(inputs, vm.NewInteropItem(&tx.Inputs[i]))
}
v.Estack().PushVal(inputs)
return nil
}
// txGetOutputs returns current transaction outputs.
func (ic *interopContext) txGetOutputs(v *vm.VM) error {
txInterface := v.Estack().Pop().Value()
tx, ok := txInterface.(*transaction.Transaction)
if !ok {
return errors.New("value is not a transaction")
}
if len(tx.Outputs) > vm.MaxArraySize {
return errors.New("too many outputs")
}
outputs := make([]vm.StackItem, 0, len(tx.Outputs))
for i := range tx.Outputs {
outputs = append(outputs, vm.NewInteropItem(&tx.Outputs[i]))
}
v.Estack().PushVal(outputs)
return nil
}
// txGetReferences returns current transaction references.
func (ic *interopContext) txGetReferences(v *vm.VM) error {
txInterface := v.Estack().Pop().Value()
tx, ok := txInterface.(*transaction.Transaction)
if !ok {
return fmt.Errorf("type mismatch: %T is not a Transaction", txInterface)
}
refs := ic.bc.References(tx)
if len(refs) > vm.MaxArraySize {
return errors.New("too many references")
}
stackrefs := make([]vm.StackItem, 0, len(refs))
for _, k := range tx.Inputs {
tio := txInOut{k, *refs[k]}
stackrefs = append(stackrefs, vm.NewInteropItem(tio))
}
v.Estack().PushVal(stackrefs)
return nil
}
// txGetType returns current transaction type.
func (ic *interopContext) txGetType(v *vm.VM) error {
txInterface := v.Estack().Pop().Value()
tx, ok := txInterface.(*transaction.Transaction)
if !ok {
return errors.New("value is not a transaction")
}
v.Estack().PushVal(int(tx.Type))
return nil
}
// txGetUnspentCoins returns current transaction unspent coins.
func (ic *interopContext) txGetUnspentCoins(v *vm.VM) error {
txInterface := v.Estack().Pop().Value()
tx, ok := txInterface.(*transaction.Transaction)
if !ok {
return errors.New("value is not a transaction")
}
ucs := ic.bc.GetUnspentCoinState(tx.Hash())
if ucs == nil {
return errors.New("no unspent coin state found")
}
v.Estack().PushVal(vm.NewInteropItem(ucs))
return nil
}
// txGetWitnesses returns current transaction witnesses.
func (ic *interopContext) txGetWitnesses(v *vm.VM) error {
txInterface := v.Estack().Pop().Value()
tx, ok := txInterface.(*transaction.Transaction)
if !ok {
return errors.New("value is not a transaction")
}
if len(tx.Scripts) > vm.MaxArraySize {
return errors.New("too many outputs")
}
scripts := make([]vm.StackItem, 0, len(tx.Scripts))
for i := range tx.Scripts {
scripts = append(scripts, vm.NewInteropItem(&tx.Scripts[i]))
}
v.Estack().PushVal(scripts)
return nil
}
// bcGetValidators returns validators.
func (ic *interopContext) bcGetValidators(v *vm.VM) error {
validators, err := ic.bc.GetValidators()
if err != nil {
return err
}
v.Estack().PushVal(validators)
return nil
}
// popInputFromVM returns transaction.Input from the first estack element.
func popInputFromVM(v *vm.VM) (*transaction.Input, error) {
inInterface := v.Estack().Pop().Value()
input, ok := inInterface.(*transaction.Input)
if !ok {
txio, ok := inInterface.(txInOut)
if !ok {
return nil, fmt.Errorf("type mismatch: %T is not an Input or txInOut", inInterface)
}
input = &txio.in
}
return input, nil
}
// inputGetHash returns hash from the given input.
func (ic *interopContext) inputGetHash(v *vm.VM) error {
input, err := popInputFromVM(v)
if err != nil {
return err
}
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v.Estack().PushVal(input.PrevHash.BytesBE())
return nil
}
// inputGetIndex returns index from the given input.
func (ic *interopContext) inputGetIndex(v *vm.VM) error {
input, err := popInputFromVM(v)
if err != nil {
return err
}
v.Estack().PushVal(input.PrevIndex)
return nil
}
// popOutputFromVM returns transaction.Input from the first estack element.
func popOutputFromVM(v *vm.VM) (*transaction.Output, error) {
outInterface := v.Estack().Pop().Value()
output, ok := outInterface.(*transaction.Output)
if !ok {
txio, ok := outInterface.(txInOut)
if !ok {
return nil, fmt.Errorf("type mismatch: %T is not an Output or txInOut", outInterface)
}
output = &txio.out
}
return output, nil
}
// outputGetAssetId returns asset ID from the given output.
func (ic *interopContext) outputGetAssetID(v *vm.VM) error {
output, err := popOutputFromVM(v)
if err != nil {
return err
}
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v.Estack().PushVal(output.AssetID.BytesBE())
return nil
}
// outputGetScriptHash returns scripthash from the given output.
func (ic *interopContext) outputGetScriptHash(v *vm.VM) error {
output, err := popOutputFromVM(v)
if err != nil {
return err
}
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v.Estack().PushVal(output.ScriptHash.BytesBE())
return nil
}
// outputGetValue returns value (amount) from the given output.
func (ic *interopContext) outputGetValue(v *vm.VM) error {
output, err := popOutputFromVM(v)
if err != nil {
return err
}
v.Estack().PushVal(int64(output.Amount))
return nil
}
// attrGetData returns tx attribute data.
func (ic *interopContext) attrGetData(v *vm.VM) error {
attrInterface := v.Estack().Pop().Value()
attr, ok := attrInterface.(*transaction.Attribute)
if !ok {
return fmt.Errorf("%T is not an attribute", attr)
}
v.Estack().PushVal(attr.Data)
return nil
}
// attrGetData returns tx attribute usage field.
func (ic *interopContext) attrGetUsage(v *vm.VM) error {
attrInterface := v.Estack().Pop().Value()
attr, ok := attrInterface.(*transaction.Attribute)
if !ok {
return fmt.Errorf("%T is not an attribute", attr)
}
v.Estack().PushVal(int(attr.Usage))
return nil
}
// bcGetAccount returns or creates an account.
func (ic *interopContext) bcGetAccount(v *vm.VM) error {
accbytes := v.Estack().Pop().Bytes()
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acchash, err := util.Uint160DecodeBytesBE(accbytes)
if err != nil {
return err
}
acc := ic.bc.GetAccountState(acchash)
if acc == nil {
acc = state.NewAccount(acchash)
}
v.Estack().PushVal(vm.NewInteropItem(acc))
return nil
}
// bcGetAsset returns an asset.
func (ic *interopContext) bcGetAsset(v *vm.VM) error {
asbytes := v.Estack().Pop().Bytes()
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ashash, err := util.Uint256DecodeBytesBE(asbytes)
if err != nil {
return err
}
as := ic.bc.GetAssetState(ashash)
if as == nil {
return errors.New("asset not found")
}
v.Estack().PushVal(vm.NewInteropItem(as))
return nil
}
// accountGetBalance returns balance for a given account.
func (ic *interopContext) accountGetBalance(v *vm.VM) error {
accInterface := v.Estack().Pop().Value()
acc, ok := accInterface.(*state.Account)
if !ok {
return fmt.Errorf("%T is not an account state", acc)
}
asbytes := v.Estack().Pop().Bytes()
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ashash, err := util.Uint256DecodeBytesBE(asbytes)
if err != nil {
return err
}
balance, ok := acc.GetBalanceValues()[ashash]
if !ok {
balance = util.Fixed8(0)
}
v.Estack().PushVal(int64(balance))
return nil
}
// accountGetScriptHash returns script hash of a given account.
func (ic *interopContext) accountGetScriptHash(v *vm.VM) error {
accInterface := v.Estack().Pop().Value()
acc, ok := accInterface.(*state.Account)
if !ok {
return fmt.Errorf("%T is not an account state", acc)
}
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v.Estack().PushVal(acc.ScriptHash.BytesBE())
return nil
}
// accountGetVotes returns votes of a given account.
func (ic *interopContext) accountGetVotes(v *vm.VM) error {
accInterface := v.Estack().Pop().Value()
acc, ok := accInterface.(*state.Account)
if !ok {
return fmt.Errorf("%T is not an account state", acc)
}
if len(acc.Votes) > vm.MaxArraySize {
return errors.New("too many votes")
}
votes := make([]vm.StackItem, 0, len(acc.Votes))
for _, key := range acc.Votes {
votes = append(votes, vm.NewByteArrayItem(key.Bytes()))
}
v.Estack().PushVal(votes)
return nil
}
// accountIsStandard checks whether given account is standard.
func (ic *interopContext) accountIsStandard(v *vm.VM) error {
accbytes := v.Estack().Pop().Bytes()
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acchash, err := util.Uint160DecodeBytesBE(accbytes)
if err != nil {
return err
}
contract := ic.bc.GetContractState(acchash)
res := contract == nil || vm.IsStandardContract(contract.Script)
v.Estack().PushVal(res)
return nil
}
/*
// storageFind finds stored key-value pair.
func (ic *interopContext) storageFind(v *vm.VM) error {
stcInterface := v.Estack().Pop().Value()
stc, ok := stcInterface.(*StorageContext)
if !ok {
return fmt.Errorf("%T is not a StorageContext", stcInterface)
}
err := ic.checkStorageContext(stc)
if err != nil {
return err
}
prefix := string(v.Estack().Pop().Bytes())
siMap, err := ic.bc.GetStorageItems(stc.ScriptHash)
if err != nil {
return err
}
for k, v := range siMap {
if strings.HasPrefix(k, prefix) {
_ = v
panic("TODO")
}
}
return nil
}
*/
// createContractStateFromVM pops all contract state elements from the VM
// evaluation stack, does a lot of checks and returns Contract if it
// succeeds.
func (ic *interopContext) createContractStateFromVM(v *vm.VM) (*state.Contract, error) {
if ic.trigger != trigger.Application {
return nil, errors.New("can't create contract when not triggered by an application")
}
script := v.Estack().Pop().Bytes()
if len(script) > MaxContractScriptSize {
return nil, errors.New("the script is too big")
}
paramBytes := v.Estack().Pop().Bytes()
if len(paramBytes) > MaxContractParametersNum {
return nil, errors.New("too many parameters for a script")
}
paramList := make([]smartcontract.ParamType, len(paramBytes))
for k, v := range paramBytes {
paramList[k] = smartcontract.ParamType(v)
}
retType := smartcontract.ParamType(v.Estack().Pop().BigInt().Int64())
properties := smartcontract.PropertyState(v.Estack().Pop().BigInt().Int64())
name := v.Estack().Pop().Bytes()
if len(name) > MaxContractStringLen {
return nil, errors.New("too big name")
}
version := v.Estack().Pop().Bytes()
if len(version) > MaxContractStringLen {
return nil, errors.New("too big version")
}
author := v.Estack().Pop().Bytes()
if len(author) > MaxContractStringLen {
return nil, errors.New("too big author")
}
email := v.Estack().Pop().Bytes()
if len(email) > MaxContractStringLen {
return nil, errors.New("too big email")
}
desc := v.Estack().Pop().Bytes()
if len(desc) > MaxContractStringLen {
return nil, errors.New("too big description")
}
contract := &state.Contract{
Script: script,
ParamList: paramList,
ReturnType: retType,
Properties: properties,
Name: string(name),
CodeVersion: string(version),
Author: string(author),
Email: string(email),
Description: string(desc),
}
return contract, nil
}
// contractCreate creates a contract.
func (ic *interopContext) contractCreate(v *vm.VM) error {
newcontract, err := ic.createContractStateFromVM(v)
if err != nil {
return nil
}
contract := ic.bc.GetContractState(newcontract.ScriptHash())
if contract == nil {
contract = newcontract
err := ic.dao.PutContractState(contract)
if err != nil {
return err
}
}
v.Estack().PushVal(vm.NewInteropItem(contract))
return nil
}
// contractGetScript returns a script associated with a contract.
func (ic *interopContext) contractGetScript(v *vm.VM) error {
csInterface := v.Estack().Pop().Value()
cs, ok := csInterface.(*state.Contract)
if !ok {
return fmt.Errorf("%T is not a contract state", cs)
}
v.Estack().PushVal(cs.Script)
return nil
}
// contractIsPayable returns whether contract is payable.
func (ic *interopContext) contractIsPayable(v *vm.VM) error {
csInterface := v.Estack().Pop().Value()
cs, ok := csInterface.(*state.Contract)
if !ok {
return fmt.Errorf("%T is not a contract state", cs)
}
v.Estack().PushVal(cs.IsPayable())
return nil
}
// contractMigrate migrates a contract.
func (ic *interopContext) contractMigrate(v *vm.VM) error {
newcontract, err := ic.createContractStateFromVM(v)
if err != nil {
return nil
}
contract := ic.bc.GetContractState(newcontract.ScriptHash())
if contract == nil {
contract = newcontract
err := ic.dao.PutContractState(contract)
if err != nil {
return err
}
if contract.HasStorage() {
hash := getContextScriptHash(v, 0)
siMap, err := ic.bc.GetStorageItems(hash)
if err != nil {
return err
}
for k, v := range siMap {
v.IsConst = false
_ = ic.dao.PutStorageItem(hash, []byte(k), v)
}
}
}
v.Estack().PushVal(vm.NewInteropItem(contract))
return ic.contractDestroy(v)
}
// assetCreate creates an asset.
func (ic *interopContext) assetCreate(v *vm.VM) error {
if ic.trigger != trigger.Application {
return errors.New("can't create asset when not triggered by an application")
}
atype := transaction.AssetType(v.Estack().Pop().BigInt().Int64())
switch atype {
case transaction.Currency, transaction.Share, transaction.Invoice, transaction.Token:
// ok
default:
return fmt.Errorf("wrong asset type: %x", atype)
}
name := string(v.Estack().Pop().Bytes())
if len(name) > MaxAssetNameLen {
return errors.New("too big name")
}
amount := util.Fixed8(v.Estack().Pop().BigInt().Int64())
if amount == util.Fixed8(0) {
return errors.New("asset amount can't be zero")
}
if amount < -util.Satoshi() {
return errors.New("asset amount can't be negative (except special -Satoshi value")
}
if atype == transaction.Invoice && amount != -util.Satoshi() {
return errors.New("invoice assets can only have -Satoshi amount")
}
precision := byte(v.Estack().Pop().BigInt().Int64())
if precision > MaxAssetPrecision {
return fmt.Errorf("can't have asset precision of more than %d", MaxAssetPrecision)
}
if atype == transaction.Share && precision != 0 {
return errors.New("share assets can only have zero precision")
}
if amount != -util.Satoshi() && (int64(amount)%int64(math.Pow10(int(MaxAssetPrecision-precision))) != 0) {
return errors.New("given asset amount has fractional component")
}
owner := &keys.PublicKey{}
err := owner.DecodeBytes(v.Estack().Pop().Bytes())
if err != nil {
return gherr.Wrap(err, "failed to get owner key")
}
if owner.IsInfinity() {
return errors.New("can't have infinity as an owner key")
}
witnessOk, err := ic.checkKeyedWitness(owner)
if err != nil {
return err
}
if !witnessOk {
return errors.New("witness check didn't succeed")
}
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admin, err := util.Uint160DecodeBytesBE(v.Estack().Pop().Bytes())
if err != nil {
return gherr.Wrap(err, "failed to get admin")
}
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issuer, err := util.Uint160DecodeBytesBE(v.Estack().Pop().Bytes())
if err != nil {
return gherr.Wrap(err, "failed to get issuer")
}
asset := &state.Asset{
ID: ic.tx.Hash(),
AssetType: atype,
Name: name,
Amount: amount,
Precision: precision,
Owner: *owner,
Admin: admin,
Issuer: issuer,
Expiration: ic.bc.BlockHeight() + DefaultAssetLifetime,
}
err = ic.dao.PutAssetState(asset)
if err != nil {
return gherr.Wrap(err, "failed to store asset")
}
v.Estack().PushVal(vm.NewInteropItem(asset))
return nil
}
// assetGetAdmin returns asset admin.
func (ic *interopContext) assetGetAdmin(v *vm.VM) error {
asInterface := v.Estack().Pop().Value()
as, ok := asInterface.(*state.Asset)
if !ok {
return fmt.Errorf("%T is not an asset state", as)
}
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v.Estack().PushVal(as.Admin.BytesBE())
return nil
}
// assetGetAmount returns the overall amount of asset available.
func (ic *interopContext) assetGetAmount(v *vm.VM) error {
asInterface := v.Estack().Pop().Value()
as, ok := asInterface.(*state.Asset)
if !ok {
return fmt.Errorf("%T is not an asset state", as)
}
v.Estack().PushVal(int64(as.Amount))
return nil
}
// assetGetAssetId returns the id of an asset.
func (ic *interopContext) assetGetAssetID(v *vm.VM) error {
asInterface := v.Estack().Pop().Value()
as, ok := asInterface.(*state.Asset)
if !ok {
return fmt.Errorf("%T is not an asset state", as)
}
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v.Estack().PushVal(as.ID.BytesBE())
return nil
}
// assetGetAssetType returns type of an asset.
func (ic *interopContext) assetGetAssetType(v *vm.VM) error {
asInterface := v.Estack().Pop().Value()
as, ok := asInterface.(*state.Asset)
if !ok {
return fmt.Errorf("%T is not an asset state", as)
}
v.Estack().PushVal(int(as.AssetType))
return nil
}
// assetGetAvailable returns available (not yet issued) amount of asset.
func (ic *interopContext) assetGetAvailable(v *vm.VM) error {
asInterface := v.Estack().Pop().Value()
as, ok := asInterface.(*state.Asset)
if !ok {
return fmt.Errorf("%T is not an asset state", as)
}
v.Estack().PushVal(int(as.Available))
return nil
}
// assetGetIssuer returns issuer of an asset.
func (ic *interopContext) assetGetIssuer(v *vm.VM) error {
asInterface := v.Estack().Pop().Value()
as, ok := asInterface.(*state.Asset)
if !ok {
return fmt.Errorf("%T is not an asset state", as)
}
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v.Estack().PushVal(as.Issuer.BytesBE())
return nil
}
// assetGetOwner returns owner of an asset.
func (ic *interopContext) assetGetOwner(v *vm.VM) error {
asInterface := v.Estack().Pop().Value()
as, ok := asInterface.(*state.Asset)
if !ok {
return fmt.Errorf("%T is not an asset state", as)
}
v.Estack().PushVal(as.Owner.Bytes())
return nil
}
// assetGetPrecision returns precision used to measure this asset.
func (ic *interopContext) assetGetPrecision(v *vm.VM) error {
asInterface := v.Estack().Pop().Value()
as, ok := asInterface.(*state.Asset)
if !ok {
return fmt.Errorf("%T is not an asset state", as)
}
v.Estack().PushVal(int(as.Precision))
return nil
}
// assetRenew updates asset expiration date.
func (ic *interopContext) assetRenew(v *vm.VM) error {
if ic.trigger != trigger.Application {
return errors.New("can't create asset when not triggered by an application")
}
asInterface := v.Estack().Pop().Value()
as, ok := asInterface.(*state.Asset)
if !ok {
return fmt.Errorf("%T is not an asset state", as)
}
years := byte(v.Estack().Pop().BigInt().Int64())
// Not sure why C# code regets an asset from the Store, but we also do it.
asset := ic.bc.GetAssetState(as.ID)
if asset == nil {
return errors.New("can't renew non-existent asset")
}
if asset.Expiration < ic.bc.BlockHeight()+1 {
asset.Expiration = ic.bc.BlockHeight() + 1
}
expiration := uint64(asset.Expiration) + uint64(years)*BlocksPerYear
if expiration > math.MaxUint32 {
expiration = math.MaxUint32
}
asset.Expiration = uint32(expiration)
err := ic.dao.PutAssetState(asset)
if err != nil {
return gherr.Wrap(err, "failed to store asset")
}
v.Estack().PushVal(expiration)
return nil
}
// runtimeSerialize serializes top stack item into a ByteArray.
func (ic *interopContext) runtimeSerialize(v *vm.VM) error {
return vm.RuntimeSerialize(v)
}
// runtimeDeserialize deserializes ByteArray from a stack into an item.
func (ic *interopContext) runtimeDeserialize(v *vm.VM) error {
return vm.RuntimeDeserialize(v)
}