252 lines
7.7 KiB
Go
252 lines
7.7 KiB
Go
package core
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import (
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"bytes"
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"crypto/elliptic"
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"errors"
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"fmt"
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"math"
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"sort"
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"github.com/nspcc-dev/neo-go/pkg/core/block"
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"github.com/nspcc-dev/neo-go/pkg/core/interop"
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istorage "github.com/nspcc-dev/neo-go/pkg/core/interop/storage"
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"github.com/nspcc-dev/neo-go/pkg/core/native"
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"github.com/nspcc-dev/neo-go/pkg/core/storage"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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var (
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errGasLimitExceeded = errors.New("gas limit exceeded")
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errFindInvalidOptions = errors.New("invalid Find options")
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)
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// StorageContext contains storing id 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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ID int32
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ReadOnly bool
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}
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// engineGetScriptContainer returns transaction or block that contains the script
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// being run.
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func engineGetScriptContainer(ic *interop.Context) error {
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var item stackitem.Item
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switch t := ic.Container.(type) {
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case *transaction.Transaction:
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item = native.TransactionToStackItem(t)
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case *block.Block:
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item = native.BlockToStackItem(t)
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default:
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return errors.New("unknown script container")
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}
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ic.VM.Estack().PushVal(item)
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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 storageDelete(ic *interop.Context) error {
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stcInterface := ic.VM.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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key := ic.VM.Estack().Pop().Bytes()
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return ic.DAO.DeleteStorageItem(stc.ID, key)
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}
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// storageGet returns stored key-value pair.
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func storageGet(ic *interop.Context) error {
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stcInterface := ic.VM.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 := ic.VM.Estack().Pop().Bytes()
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si := ic.DAO.GetStorageItem(stc.ID, key)
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if si != nil {
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ic.VM.Estack().PushVal([]byte(si))
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} else {
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ic.VM.Estack().PushVal(stackitem.Null{})
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}
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return nil
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}
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// storageGetContext returns storage context (scripthash).
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func storageGetContext(ic *interop.Context) error {
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return storageGetContextInternal(ic, false)
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}
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// storageGetReadOnlyContext returns read-only context (scripthash).
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func storageGetReadOnlyContext(ic *interop.Context) error {
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return storageGetContextInternal(ic, true)
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}
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// storageGetContextInternal is internal version of storageGetContext and
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// storageGetReadOnlyContext which allows to specify ReadOnly context flag.
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func storageGetContextInternal(ic *interop.Context, isReadOnly bool) error {
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contract, err := ic.GetContract(ic.VM.GetCurrentScriptHash())
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if err != nil {
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return err
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}
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sc := &StorageContext{
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ID: contract.ID,
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ReadOnly: isReadOnly,
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}
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ic.VM.Estack().PushVal(stackitem.NewInterop(sc))
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return nil
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}
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func putWithContext(ic *interop.Context, stc *StorageContext, key []byte, value []byte) error {
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if len(key) > storage.MaxStorageKeyLen {
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return errors.New("key is too big")
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}
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if len(value) > storage.MaxStorageValueLen {
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return errors.New("value is too big")
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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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si := ic.DAO.GetStorageItem(stc.ID, key)
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sizeInc := len(value)
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if si == nil {
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sizeInc = len(key) + len(value)
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} else if len(value) != 0 {
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if len(value) <= len(si) {
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sizeInc = (len(value)-1)/4 + 1
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} else if len(si) != 0 {
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sizeInc = (len(si)-1)/4 + 1 + len(value) - len(si)
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}
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}
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if !ic.VM.AddGas(int64(sizeInc) * ic.Chain.GetPolicer().GetStoragePrice()) {
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return errGasLimitExceeded
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}
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return ic.DAO.PutStorageItem(stc.ID, key, value)
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}
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// storagePut puts key-value pair into the storage.
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func storagePut(ic *interop.Context) error {
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stcInterface := ic.VM.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 := ic.VM.Estack().Pop().Bytes()
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value := ic.VM.Estack().Pop().Bytes()
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return putWithContext(ic, stc, key, value)
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}
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// storageContextAsReadOnly sets given context to read-only mode.
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func storageContextAsReadOnly(ic *interop.Context) error {
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stcInterface := ic.VM.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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stx := &StorageContext{
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ID: stc.ID,
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ReadOnly: true,
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}
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stc = stx
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}
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ic.VM.Estack().PushVal(stackitem.NewInterop(stc))
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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) error {
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stcInterface := ic.VM.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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prefix := ic.VM.Estack().Pop().Bytes()
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opts := ic.VM.Estack().Pop().BigInt().Int64()
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if opts&^istorage.FindAll != 0 {
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return fmt.Errorf("%w: unknown flag", errFindInvalidOptions)
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}
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if opts&istorage.FindKeysOnly != 0 &&
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opts&(istorage.FindDeserialize|istorage.FindPick0|istorage.FindPick1) != 0 {
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return fmt.Errorf("%w KeysOnly conflicts with other options", errFindInvalidOptions)
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}
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if opts&istorage.FindValuesOnly != 0 &&
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opts&(istorage.FindKeysOnly|istorage.FindRemovePrefix) != 0 {
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return fmt.Errorf("%w: KeysOnly conflicts with ValuesOnly", errFindInvalidOptions)
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}
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if opts&istorage.FindPick0 != 0 && opts&istorage.FindPick1 != 0 {
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return fmt.Errorf("%w: Pick0 conflicts with Pick1", errFindInvalidOptions)
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}
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if opts&istorage.FindDeserialize == 0 && (opts&istorage.FindPick0 != 0 || opts&istorage.FindPick1 != 0) {
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return fmt.Errorf("%w: PickN is specified without Deserialize", errFindInvalidOptions)
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}
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siMap, err := ic.DAO.GetStorageItemsWithPrefix(stc.ID, 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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key := append(prefix, []byte(k)...)
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keycopy := make([]byte, len(key))
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copy(keycopy, key)
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filteredMap.Add(stackitem.NewByteArray(keycopy), stackitem.NewByteArray(v))
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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 := istorage.NewIterator(filteredMap, len(prefix), opts)
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ic.VM.Estack().PushVal(stackitem.NewInterop(item))
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return nil
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}
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// contractCreateMultisigAccount calculates multisig contract scripthash for a
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// given m and a set of public keys.
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func contractCreateMultisigAccount(ic *interop.Context) error {
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m := ic.VM.Estack().Pop().BigInt()
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if !m.IsInt64() || m.Int64() > math.MaxInt32 {
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return errors.New("m should fit int32")
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}
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arr := ic.VM.Estack().Pop().Array()
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pubs := make(keys.PublicKeys, len(arr))
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for i, pk := range arr {
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p, err := keys.NewPublicKeyFromBytes(pk.Value().([]byte), elliptic.P256())
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if err != nil {
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return err
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}
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pubs[i] = p
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}
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script, err := smartcontract.CreateMultiSigRedeemScript(int(m.Int64()), pubs)
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if err != nil {
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return err
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}
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ic.VM.Estack().PushVal(hash.Hash160(script).BytesBE())
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return nil
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}
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// contractCreateStandardAccount calculates contract scripthash for a given public key.
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func contractCreateStandardAccount(ic *interop.Context) error {
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h := ic.VM.Estack().Pop().Bytes()
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p, err := keys.NewPublicKeyFromBytes(h, elliptic.P256())
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if err != nil {
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return err
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}
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ic.VM.Estack().PushVal(p.GetScriptHash().BytesBE())
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return nil
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}
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// contractGetCallFlags returns current context calling flags.
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func contractGetCallFlags(ic *interop.Context) error {
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ic.VM.Estack().PushVal(ic.VM.Context().GetCallFlags())
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return nil
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}
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