583 lines
16 KiB
Go
583 lines
16 KiB
Go
package core
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import (
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"errors"
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"fmt"
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"math"
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"github.com/CityOfZion/neo-go/pkg/core/transaction"
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"github.com/CityOfZion/neo-go/pkg/crypto/hash"
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"github.com/CityOfZion/neo-go/pkg/crypto/keys"
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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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"github.com/CityOfZion/neo-go/pkg/vm"
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gherr "github.com/pkg/errors"
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log "github.com/sirupsen/logrus"
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)
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const (
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// MaxStorageKeyLen is the maximum length of a key for storage items.
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MaxStorageKeyLen = 1024
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)
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// StorageContext contains storing script hash and read/write flag, it's used as
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// a context for storage manipulation functions.
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type StorageContext struct {
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ScriptHash util.Uint160
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ReadOnly bool
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}
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// getBlockHashFromElement converts given vm.Element to block hash using given
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// Blockchainer if needed. Interop functions accept both block numbers and
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// block hashes as parameters, thus this function is needed.
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func getBlockHashFromElement(bc Blockchainer, element *vm.Element) (util.Uint256, error) {
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var hash util.Uint256
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hashbytes := element.Bytes()
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if len(hashbytes) <= 5 {
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hashint := element.BigInt().Int64()
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if hashint < 0 || hashint > math.MaxUint32 {
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return hash, errors.New("bad block index")
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}
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hash = bc.GetHeaderHash(int(hashint))
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} else {
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return util.Uint256DecodeReverseBytes(hashbytes)
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}
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return hash, nil
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}
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// bcGetBlock returns current block.
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func (ic *interopContext) bcGetBlock(v *vm.VM) error {
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hash, err := getBlockHashFromElement(ic.bc, v.Estack().Pop())
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if err != nil {
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return err
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}
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block, err := ic.bc.GetBlock(hash)
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if err != nil {
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v.Estack().PushVal([]byte{})
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} else {
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v.Estack().PushVal(vm.NewInteropItem(block))
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}
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return nil
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}
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// bcGetContract returns contract.
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func (ic *interopContext) bcGetContract(v *vm.VM) error {
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hashbytes := v.Estack().Pop().Bytes()
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hash, err := util.Uint160DecodeBytes(hashbytes)
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if err != nil {
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return err
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}
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cs := ic.bc.GetContractState(hash)
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if cs == nil {
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v.Estack().PushVal([]byte{})
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} else {
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v.Estack().PushVal(vm.NewInteropItem(cs))
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}
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return nil
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}
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// bcGetHeader returns block header.
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func (ic *interopContext) bcGetHeader(v *vm.VM) error {
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hash, err := getBlockHashFromElement(ic.bc, v.Estack().Pop())
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if err != nil {
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return err
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}
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header, err := ic.bc.GetHeader(hash)
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if err != nil {
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v.Estack().PushVal([]byte{})
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} else {
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v.Estack().PushVal(vm.NewInteropItem(header))
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}
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return nil
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}
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// bcGetHeight returns blockchain height.
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func (ic *interopContext) bcGetHeight(v *vm.VM) error {
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v.Estack().PushVal(ic.bc.BlockHeight())
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return nil
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}
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// getTransactionAndHeight gets parameter from the vm evaluation stack and
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// returns transaction and its height if it's present in the blockchain.
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func getTransactionAndHeight(bc Blockchainer, v *vm.VM) (*transaction.Transaction, uint32, error) {
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hashbytes := v.Estack().Pop().Bytes()
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hash, err := util.Uint256DecodeReverseBytes(hashbytes)
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if err != nil {
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return nil, 0, err
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}
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return bc.GetTransaction(hash)
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}
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// bcGetTransaction returns transaction.
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func (ic *interopContext) bcGetTransaction(v *vm.VM) error {
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tx, _, err := getTransactionAndHeight(ic.bc, 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(vm.NewInteropItem(tx))
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return nil
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}
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// bcGetTransactionHeight returns transaction height.
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func (ic *interopContext) bcGetTransactionHeight(v *vm.VM) error {
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_, h, err := getTransactionAndHeight(ic.bc, 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(h)
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return nil
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}
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// popHeaderFromVM returns pointer to Header or error. It's main feature is
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// proper treatment of Block structure, because C# code implicitly assumes
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// that header APIs can also operate on blocks.
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func popHeaderFromVM(v *vm.VM) (*Header, error) {
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iface := v.Estack().Pop().Value()
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header, ok := iface.(*Header)
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if !ok {
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block, ok := iface.(*Block)
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if !ok {
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return nil, errors.New("value is not a header or block")
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}
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return block.Header(), nil
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}
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return header, nil
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}
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// headerGetIndex returns block index from the header.
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func (ic *interopContext) headerGetIndex(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.Index)
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return nil
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}
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// headerGetHash returns header hash of the passed header.
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func (ic *interopContext) headerGetHash(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.Hash().BytesReverse())
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return nil
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}
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// headerGetPrevHash returns previous header hash of the passed header.
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func (ic *interopContext) headerGetPrevHash(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.PrevHash.BytesReverse())
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return nil
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}
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// headerGetTimestamp returns timestamp of the passed header.
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func (ic *interopContext) headerGetTimestamp(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.Timestamp)
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return nil
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}
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// blockGetTransactionCount returns transactions count in the given block.
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func (ic *interopContext) blockGetTransactionCount(v *vm.VM) error {
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blockInterface := v.Estack().Pop().Value()
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block, ok := blockInterface.(*Block)
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if !ok {
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return errors.New("value is not a block")
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}
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v.Estack().PushVal(len(block.Transactions))
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return nil
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}
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// blockGetTransactions returns transactions from the given block.
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func (ic *interopContext) blockGetTransactions(v *vm.VM) error {
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blockInterface := v.Estack().Pop().Value()
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block, ok := blockInterface.(*Block)
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if !ok {
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return errors.New("value is not a block")
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}
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if len(block.Transactions) > vm.MaxArraySize {
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return errors.New("too many transactions")
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}
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txes := make([]vm.StackItem, 0, len(block.Transactions))
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for _, tx := range block.Transactions {
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txes = append(txes, vm.NewInteropItem(tx))
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}
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v.Estack().PushVal(txes)
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return nil
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}
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// blockGetTransaction returns transaction with the given number from the given
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// block.
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func (ic *interopContext) blockGetTransaction(v *vm.VM) error {
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blockInterface := v.Estack().Pop().Value()
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block, ok := blockInterface.(*Block)
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if !ok {
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return errors.New("value is not a block")
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}
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index := v.Estack().Pop().BigInt().Int64()
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if index < 0 || index >= int64(len(block.Transactions)) {
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return errors.New("wrong transaction index")
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}
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tx := block.Transactions[index]
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v.Estack().PushVal(vm.NewInteropItem(tx))
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return nil
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}
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// txGetHash returns transaction's hash.
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func (ic *interopContext) txGetHash(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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v.Estack().PushVal(tx.Hash().BytesReverse())
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return nil
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}
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// engineGetScriptContainer returns transaction that contains the script being
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// run.
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func (ic *interopContext) engineGetScriptContainer(v *vm.VM) error {
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v.Estack().PushVal(vm.NewInteropItem(ic.tx))
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return nil
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}
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// pushContextScriptHash returns script hash of the invocation stack element
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// number n.
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func getContextScriptHash(v *vm.VM, n int) util.Uint160 {
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ctxIface := v.Istack().Peek(n).Value()
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ctx := ctxIface.(*vm.Context)
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return hash.Hash160(ctx.Program())
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}
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// pushContextScriptHash pushes to evaluation stack the script hash of the
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// invocation stack element number n.
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func pushContextScriptHash(v *vm.VM, n int) error {
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h := getContextScriptHash(v, n)
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v.Estack().PushVal(h.Bytes())
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return nil
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}
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// engineGetExecutingScriptHash returns executing script hash.
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func (ic *interopContext) engineGetExecutingScriptHash(v *vm.VM) error {
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return pushContextScriptHash(v, 0)
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}
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// engineGetCallingScriptHash returns calling script hash.
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func (ic *interopContext) engineGetCallingScriptHash(v *vm.VM) error {
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return pushContextScriptHash(v, 1)
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}
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// engineGetEntryScriptHash returns entry script hash.
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func (ic *interopContext) engineGetEntryScriptHash(v *vm.VM) error {
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return pushContextScriptHash(v, v.Istack().Len()-1)
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}
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// runtimePlatform returns the name of the platform.
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func (ic *interopContext) runtimePlatform(v *vm.VM) error {
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v.Estack().PushVal([]byte("NEO"))
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return nil
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}
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// runtimeGetTrigger returns the script trigger.
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func (ic *interopContext) runtimeGetTrigger(v *vm.VM) error {
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v.Estack().PushVal(ic.trigger)
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return nil
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}
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// checkHashedWitness checks given hash against current list of script hashes
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// for verifying in the interop context.
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func (ic *interopContext) checkHashedWitness(hash util.Uint160) (bool, error) {
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hashes, err := ic.bc.GetScriptHashesForVerifying(ic.tx)
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if err != nil {
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return false, gherr.Wrap(err, "failed to get script hashes")
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}
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for _, v := range hashes {
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if hash.Equals(v) {
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return true, nil
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}
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}
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return false, nil
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}
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// checkKeyedWitness checks hash of signature check contract with a given public
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// key against current list of script hashes for verifying in the interop context.
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func (ic *interopContext) checkKeyedWitness(key *keys.PublicKey) (bool, error) {
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script, err := smartcontract.CreateSignatureRedeemScript(key)
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if err != nil {
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return false, gherr.Wrap(err, "failed to create signature script for a key")
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}
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return ic.checkHashedWitness(hash.Hash160(script))
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}
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// runtimeCheckWitness checks witnesses.
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func (ic *interopContext) runtimeCheckWitness(v *vm.VM) error {
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var res bool
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var err error
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hashOrKey := v.Estack().Pop().Bytes()
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hash, err := util.Uint160DecodeBytes(hashOrKey)
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if err != nil {
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key := &keys.PublicKey{}
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err = key.DecodeBytes(hashOrKey)
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if err != nil {
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return errors.New("parameter given is neither a key nor a hash")
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}
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res, err = ic.checkKeyedWitness(key)
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} else {
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res, err = ic.checkHashedWitness(hash)
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}
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if err != nil {
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return gherr.Wrap(err, "failed to check")
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}
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v.Estack().PushVal(res)
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return nil
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}
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// runtimeNotify should pass stack item to the notify plugin to handle it, but
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// in neo-go the only meaningful thing to do here is to log.
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func (ic *interopContext) runtimeNotify(v *vm.VM) error {
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msg := fmt.Sprintf("%q", v.Estack().Pop().Bytes())
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log.Infof("script %s notifies: %s", getContextScriptHash(v, 0), msg)
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return nil
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}
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// runtimeLog logs the message passed.
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func (ic *interopContext) runtimeLog(v *vm.VM) error {
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msg := fmt.Sprintf("%q", v.Estack().Pop().Bytes())
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log.Infof("script %s logs: %s", getContextScriptHash(v, 0), msg)
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return nil
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}
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// runtimeGetTime returns timestamp of the block being verified, or the latest
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// one in the blockchain if no block is given to interopContext.
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func (ic *interopContext) runtimeGetTime(v *vm.VM) error {
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var header *Header
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if ic.block == nil {
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var err error
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header, err = ic.bc.GetHeader(ic.bc.CurrentBlockHash())
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if err != nil {
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return err
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}
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} else {
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header = ic.block.Header()
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}
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v.Estack().PushVal(header.Timestamp)
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return nil
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}
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/*
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// runtimeSerialize serializes given stack item.
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func (ic *interopContext) runtimeSerialize(v *vm.VM) error {
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panic("TODO")
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}
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// runtimeDeserialize deserializes given stack item.
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func (ic *interopContext) runtimeDeserialize(v *vm.VM) error {
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panic("TODO")
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}
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*/
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func (ic *interopContext) checkStorageContext(stc *StorageContext) error {
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contract := ic.bc.GetContractState(stc.ScriptHash)
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if contract == nil {
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return errors.New("no contract found")
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}
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if !contract.HasStorage() {
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return errors.New("contract can't have storage")
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}
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return nil
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}
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// storageDelete deletes stored key-value pair.
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func (ic *interopContext) storageDelete(v *vm.VM) error {
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if ic.trigger != 0x10 && ic.trigger != 0x11 {
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return errors.New("can't delete when the trigger is not application")
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}
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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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if stc.ReadOnly {
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return errors.New("StorageContext is read only")
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}
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err := ic.checkStorageContext(stc)
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if err != nil {
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return err
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}
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key := v.Estack().Pop().Bytes()
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si := getStorageItemFromStore(ic.mem, stc.ScriptHash, key)
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if si == nil {
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si = ic.bc.GetStorageItem(stc.ScriptHash, key)
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}
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if si != nil && si.IsConst {
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return errors.New("storage item is constant")
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}
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return deleteStorageItemInStore(ic.mem, stc.ScriptHash, key)
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}
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|
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// storageGet returns stored key-value pair.
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func (ic *interopContext) storageGet(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 := ic.checkStorageContext(stc)
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if err != nil {
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return err
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}
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key := v.Estack().Pop().Bytes()
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si := getStorageItemFromStore(ic.mem, stc.ScriptHash, key)
|
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if si == nil {
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si = ic.bc.GetStorageItem(stc.ScriptHash, key)
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}
|
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if si != nil && si.Value != nil {
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v.Estack().PushVal(si.Value)
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} else {
|
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v.Estack().PushVal([]byte{})
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}
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return nil
|
|
}
|
|
|
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// storageGetContext returns storage context (scripthash).
|
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func (ic *interopContext) storageGetContext(v *vm.VM) error {
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sc := &StorageContext{
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ScriptHash: getContextScriptHash(v, 0),
|
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ReadOnly: false,
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}
|
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v.Estack().PushVal(vm.NewInteropItem(sc))
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return nil
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}
|
|
|
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// storageGetReadOnlyContext returns read-only context (scripthash).
|
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func (ic *interopContext) storageGetReadOnlyContext(v *vm.VM) error {
|
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sc := &StorageContext{
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ScriptHash: getContextScriptHash(v, 0),
|
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ReadOnly: true,
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}
|
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v.Estack().PushVal(vm.NewInteropItem(sc))
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return nil
|
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}
|
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|
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func (ic *interopContext) putWithContextAndFlags(stc *StorageContext, key []byte, value []byte, isConst bool) error {
|
|
if ic.trigger != 0x10 && ic.trigger != 0x11 {
|
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return errors.New("can't delete when the trigger is not application")
|
|
}
|
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if len(key) > MaxStorageKeyLen {
|
|
return errors.New("key is too big")
|
|
}
|
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if stc.ReadOnly {
|
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return errors.New("StorageContext is read only")
|
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}
|
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err := ic.checkStorageContext(stc)
|
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if err != nil {
|
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return err
|
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}
|
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si := getStorageItemFromStore(ic.mem, stc.ScriptHash, key)
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if si == nil {
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si = ic.bc.GetStorageItem(stc.ScriptHash, key)
|
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if si == nil {
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si = &StorageItem{}
|
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}
|
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}
|
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if si.IsConst {
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return errors.New("storage item exists and is read-only")
|
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}
|
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si.Value = value
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si.IsConst = isConst
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return putStorageItemIntoStore(ic.mem, stc.ScriptHash, key, si)
|
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}
|
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|
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// storagePutInternal is a unified implementation of storagePut and storagePutEx.
|
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func (ic *interopContext) storagePutInternal(v *vm.VM, getFlag bool) 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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key := v.Estack().Pop().Bytes()
|
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value := v.Estack().Pop().Bytes()
|
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var flag int
|
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if getFlag {
|
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flag = int(v.Estack().Pop().BigInt().Int64())
|
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}
|
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return ic.putWithContextAndFlags(stc, key, value, flag == 1)
|
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}
|
|
|
|
// storagePut puts key-value pair into the storage.
|
|
func (ic *interopContext) storagePut(v *vm.VM) error {
|
|
return ic.storagePutInternal(v, false)
|
|
}
|
|
|
|
// storagePutEx puts key-value pair with given flags into the storage.
|
|
func (ic *interopContext) storagePutEx(v *vm.VM) error {
|
|
return ic.storagePutInternal(v, true)
|
|
}
|
|
|
|
// storageContextAsReadOnly sets given context to read-only mode.
|
|
func (ic *interopContext) storageContextAsReadOnly(v *vm.VM) error {
|
|
stcInterface := v.Estack().Pop().Value()
|
|
stc, ok := stcInterface.(*StorageContext)
|
|
if !ok {
|
|
return fmt.Errorf("%T is not a StorageContext", stcInterface)
|
|
}
|
|
if !stc.ReadOnly {
|
|
stx := &StorageContext{
|
|
ScriptHash: stc.ScriptHash,
|
|
ReadOnly: true,
|
|
}
|
|
stc = stx
|
|
}
|
|
v.Estack().PushVal(vm.NewInteropItem(stc))
|
|
return nil
|
|
}
|
|
|
|
// contractDestroy destroys a contract.
|
|
func (ic *interopContext) contractDestroy(v *vm.VM) error {
|
|
if ic.trigger != 0x10 {
|
|
return errors.New("can't destroy contract when not triggered by application")
|
|
}
|
|
hash := getContextScriptHash(v, 0)
|
|
cs := ic.bc.GetContractState(hash)
|
|
if cs == nil {
|
|
return nil
|
|
}
|
|
err := deleteContractStateInStore(ic.mem, hash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if cs.HasStorage() {
|
|
siMap, err := ic.bc.GetStorageItems(hash)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for k := range siMap {
|
|
_ = deleteStorageItemInStore(ic.mem, hash, []byte(k))
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// contractGetStorageContext retrieves StorageContext of a contract.
|
|
func (ic *interopContext) contractGetStorageContext(v *vm.VM) error {
|
|
csInterface := v.Estack().Pop().Value()
|
|
cs, ok := csInterface.(*ContractState)
|
|
if !ok {
|
|
return fmt.Errorf("%T is not a contract state", cs)
|
|
}
|
|
if getContractStateFromStore(ic.mem, cs.ScriptHash()) == nil {
|
|
return fmt.Errorf("contract was not created in this transaction")
|
|
}
|
|
stc := &StorageContext{
|
|
ScriptHash: cs.ScriptHash(),
|
|
}
|
|
v.Estack().PushVal(vm.NewInteropItem(stc))
|
|
return nil
|
|
}
|