neo-go/pkg/core/interop_system.go

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package core
import (
"context"
"crypto/elliptic"
"errors"
"fmt"
"math"
"math/big"
"github.com/nspcc-dev/neo-go/pkg/core/block"
"github.com/nspcc-dev/neo-go/pkg/core/interop"
istorage "github.com/nspcc-dev/neo-go/pkg/core/interop/storage"
"github.com/nspcc-dev/neo-go/pkg/core/native"
"github.com/nspcc-dev/neo-go/pkg/core/storage"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
var (
errGasLimitExceeded = errors.New("gas limit exceeded")
errFindInvalidOptions = errors.New("invalid Find options")
)
// StorageContext contains storing id and read/write flag, it's used as
// a context for storage manipulation functions.
type StorageContext struct {
ID int32
ReadOnly bool
}
// engineGetScriptContainer returns transaction or block that contains the script
// being run.
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func engineGetScriptContainer(ic *interop.Context) error {
var item stackitem.Item
switch t := ic.Container.(type) {
case *transaction.Transaction:
item = native.TransactionToStackItem(t)
case *block.Block:
item = native.BlockToStackItem(t)
default:
return errors.New("unknown script container")
}
ic.VM.Estack().PushItem(item)
return nil
}
// storageDelete deletes stored key-value pair.
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func storageDelete(ic *interop.Context) error {
stcInterface := ic.VM.Estack().Pop().Value()
stc, ok := stcInterface.(*StorageContext)
if !ok {
return fmt.Errorf("%T is not a StorageContext", stcInterface)
}
if stc.ReadOnly {
return errors.New("StorageContext is read only")
}
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key := ic.VM.Estack().Pop().Bytes()
return ic.DAO.DeleteStorageItem(stc.ID, key)
}
// storageGet returns stored key-value pair.
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func storageGet(ic *interop.Context) error {
stcInterface := ic.VM.Estack().Pop().Value()
stc, ok := stcInterface.(*StorageContext)
if !ok {
return fmt.Errorf("%T is not a StorageContext", stcInterface)
}
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key := ic.VM.Estack().Pop().Bytes()
si := ic.DAO.GetStorageItem(stc.ID, key)
if si != nil {
ic.VM.Estack().PushItem(stackitem.NewByteArray([]byte(si)))
} else {
ic.VM.Estack().PushItem(stackitem.Null{})
}
return nil
}
// storageGetContext returns storage context (scripthash).
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func storageGetContext(ic *interop.Context) error {
return storageGetContextInternal(ic, false)
}
// storageGetReadOnlyContext returns read-only context (scripthash).
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func storageGetReadOnlyContext(ic *interop.Context) error {
return storageGetContextInternal(ic, true)
}
// storageGetContextInternal is internal version of storageGetContext and
// storageGetReadOnlyContext which allows to specify ReadOnly context flag.
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func storageGetContextInternal(ic *interop.Context, isReadOnly bool) error {
contract, err := ic.GetContract(ic.VM.GetCurrentScriptHash())
if err != nil {
return err
}
sc := &StorageContext{
ID: contract.ID,
ReadOnly: isReadOnly,
}
ic.VM.Estack().PushItem(stackitem.NewInterop(sc))
return nil
}
func putWithContext(ic *interop.Context, stc *StorageContext, key []byte, value []byte) error {
if len(key) > storage.MaxStorageKeyLen {
return errors.New("key is too big")
}
if len(value) > storage.MaxStorageValueLen {
return errors.New("value is too big")
}
if stc.ReadOnly {
return errors.New("StorageContext is read only")
}
si := ic.DAO.GetStorageItem(stc.ID, key)
sizeInc := len(value)
if si == nil {
sizeInc = len(key) + len(value)
} else if len(value) != 0 {
if len(value) <= len(si) {
sizeInc = (len(value)-1)/4 + 1
} else if len(si) != 0 {
sizeInc = (len(si)-1)/4 + 1 + len(value) - len(si)
}
}
if !ic.VM.AddGas(int64(sizeInc) * ic.Chain.GetPolicer().GetStoragePrice()) {
return errGasLimitExceeded
}
return ic.DAO.PutStorageItem(stc.ID, key, value)
}
// storagePut puts key-value pair into the storage.
func storagePut(ic *interop.Context) error {
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stcInterface := ic.VM.Estack().Pop().Value()
stc, ok := stcInterface.(*StorageContext)
if !ok {
return fmt.Errorf("%T is not a StorageContext", stcInterface)
}
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key := ic.VM.Estack().Pop().Bytes()
value := ic.VM.Estack().Pop().Bytes()
return putWithContext(ic, stc, key, value)
}
// storageContextAsReadOnly sets given context to read-only mode.
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func storageContextAsReadOnly(ic *interop.Context) error {
stcInterface := ic.VM.Estack().Pop().Value()
stc, ok := stcInterface.(*StorageContext)
if !ok {
return fmt.Errorf("%T is not a StorageContext", stcInterface)
}
if !stc.ReadOnly {
stx := &StorageContext{
ID: stc.ID,
ReadOnly: true,
}
stc = stx
}
ic.VM.Estack().PushItem(stackitem.NewInterop(stc))
return nil
}
// storageFind finds stored key-value pair.
func storageFind(ic *interop.Context) error {
stcInterface := ic.VM.Estack().Pop().Value()
stc, ok := stcInterface.(*StorageContext)
if !ok {
return fmt.Errorf("%T is not a StorageContext", stcInterface)
}
prefix := ic.VM.Estack().Pop().Bytes()
opts := ic.VM.Estack().Pop().BigInt().Int64()
if opts&^istorage.FindAll != 0 {
return fmt.Errorf("%w: unknown flag", errFindInvalidOptions)
}
if opts&istorage.FindKeysOnly != 0 &&
opts&(istorage.FindDeserialize|istorage.FindPick0|istorage.FindPick1) != 0 {
return fmt.Errorf("%w KeysOnly conflicts with other options", errFindInvalidOptions)
}
if opts&istorage.FindValuesOnly != 0 &&
opts&(istorage.FindKeysOnly|istorage.FindRemovePrefix) != 0 {
return fmt.Errorf("%w: KeysOnly conflicts with ValuesOnly", errFindInvalidOptions)
}
if opts&istorage.FindPick0 != 0 && opts&istorage.FindPick1 != 0 {
return fmt.Errorf("%w: Pick0 conflicts with Pick1", errFindInvalidOptions)
}
if opts&istorage.FindDeserialize == 0 && (opts&istorage.FindPick0 != 0 || opts&istorage.FindPick1 != 0) {
return fmt.Errorf("%w: PickN is specified without Deserialize", errFindInvalidOptions)
}
// Items in seekres should be sorted by key, but GetStorageItemsWithPrefix returns
// sorted items, so no need to sort them one more time.
ctx, cancel := context.WithCancel(context.Background())
seekres := ic.DAO.SeekAsync(ctx, stc.ID, storage.SeekRange{Prefix: prefix})
item := istorage.NewIterator(seekres, prefix, opts)
ic.VM.Estack().PushItem(stackitem.NewInterop(item))
ic.RegisterCancelFunc(cancel)
return nil
}
// contractCreateMultisigAccount calculates multisig contract scripthash for a
// given m and a set of public keys.
func contractCreateMultisigAccount(ic *interop.Context) error {
m := ic.VM.Estack().Pop().BigInt()
mu64 := m.Uint64()
if !m.IsUint64() || mu64 > math.MaxInt32 {
return errors.New("m must be positive and fit int32")
}
arr := ic.VM.Estack().Pop().Array()
pubs := make(keys.PublicKeys, len(arr))
for i, pk := range arr {
p, err := keys.NewPublicKeyFromBytes(pk.Value().([]byte), elliptic.P256())
if err != nil {
return err
}
pubs[i] = p
}
script, err := smartcontract.CreateMultiSigRedeemScript(int(mu64), pubs)
if err != nil {
return err
}
ic.VM.Estack().PushItem(stackitem.NewByteArray(hash.Hash160(script).BytesBE()))
return nil
}
// contractCreateStandardAccount calculates contract scripthash for a given public key.
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func contractCreateStandardAccount(ic *interop.Context) error {
h := ic.VM.Estack().Pop().Bytes()
p, err := keys.NewPublicKeyFromBytes(h, elliptic.P256())
if err != nil {
return err
}
ic.VM.Estack().PushItem(stackitem.NewByteArray(p.GetScriptHash().BytesBE()))
return nil
}
// contractGetCallFlags returns current context calling flags.
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func contractGetCallFlags(ic *interop.Context) error {
ic.VM.Estack().PushItem(stackitem.NewBigInteger(big.NewInt(int64(ic.VM.Context().GetCallFlags()))))
return nil
}