mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-12-23 23:25:22 +00:00
243 lines
6.9 KiB
Go
243 lines
6.9 KiB
Go
package core
|
|
|
|
import (
|
|
"crypto/elliptic"
|
|
"errors"
|
|
"fmt"
|
|
"math"
|
|
|
|
"github.com/nspcc-dev/neo-go/pkg/core/block"
|
|
"github.com/nspcc-dev/neo-go/pkg/core/interop"
|
|
"github.com/nspcc-dev/neo-go/pkg/core/native"
|
|
"github.com/nspcc-dev/neo-go/pkg/core/state"
|
|
"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/util"
|
|
"github.com/nspcc-dev/neo-go/pkg/vm"
|
|
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
|
|
)
|
|
|
|
const (
|
|
// MaxStorageKeyLen is the maximum length of a key for storage items.
|
|
MaxStorageKeyLen = 64
|
|
// MaxStorageValueLen is the maximum length of a value for storage items.
|
|
// It is set to be the maximum value for uint16.
|
|
MaxStorageValueLen = 65535
|
|
)
|
|
|
|
// 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
|
|
}
|
|
|
|
// StorageFlag represents storage flag which denotes whether the stored value is
|
|
// a constant.
|
|
type StorageFlag byte
|
|
|
|
const (
|
|
// None is a storage flag for non-constant items.
|
|
None StorageFlag = 0
|
|
// Constant is a storage flag for constant items.
|
|
Constant StorageFlag = 0x01
|
|
)
|
|
|
|
// engineGetScriptContainer returns transaction or block that contains the script
|
|
// being run.
|
|
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().PushVal(item)
|
|
return nil
|
|
}
|
|
|
|
// storageDelete deletes stored key-value pair.
|
|
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")
|
|
}
|
|
ic.VM.AddGas(ic.Chain.GetPolicer().GetStoragePrice())
|
|
key := ic.VM.Estack().Pop().Bytes()
|
|
return ic.DAO.DeleteStorageItem(stc.ID, key)
|
|
}
|
|
|
|
// storageGet returns stored key-value pair.
|
|
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)
|
|
}
|
|
key := ic.VM.Estack().Pop().Bytes()
|
|
si := ic.DAO.GetStorageItem(stc.ID, key)
|
|
if si != nil {
|
|
ic.VM.Estack().PushVal([]byte(si))
|
|
} else {
|
|
ic.VM.Estack().PushVal(stackitem.Null{})
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// storageGetContext returns storage context (scripthash).
|
|
func storageGetContext(ic *interop.Context) error {
|
|
return storageGetContextInternal(ic, false)
|
|
}
|
|
|
|
// storageGetReadOnlyContext returns read-only context (scripthash).
|
|
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.
|
|
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().PushVal(stackitem.NewInterop(sc))
|
|
return nil
|
|
}
|
|
|
|
func putWithContext(ic *interop.Context, stc *StorageContext, key []byte, value []byte) error {
|
|
if len(key) > MaxStorageKeyLen {
|
|
return errors.New("key is too big")
|
|
}
|
|
if len(value) > 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 {
|
|
si = state.StorageItem{}
|
|
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 {
|
|
stcInterface := ic.VM.Estack().Pop().Value()
|
|
stc, ok := stcInterface.(*StorageContext)
|
|
if !ok {
|
|
return fmt.Errorf("%T is not a StorageContext", stcInterface)
|
|
}
|
|
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.
|
|
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().PushVal(stackitem.NewInterop(stc))
|
|
return nil
|
|
}
|
|
|
|
// contractIsStandard checks if contract is standard (sig or multisig) contract.
|
|
func contractIsStandard(ic *interop.Context) error {
|
|
h := ic.VM.Estack().Pop().Bytes()
|
|
u, err := util.Uint160DecodeBytesBE(h)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
var result bool
|
|
cs, _ := ic.GetContract(u)
|
|
if cs != nil {
|
|
result = vm.IsStandardContract(cs.NEF.Script)
|
|
} else {
|
|
if tx, ok := ic.Container.(*transaction.Transaction); ok {
|
|
for _, witness := range tx.Scripts {
|
|
if witness.ScriptHash() == u {
|
|
result = vm.IsStandardContract(witness.VerificationScript)
|
|
break
|
|
}
|
|
}
|
|
}
|
|
}
|
|
ic.VM.Estack().PushVal(result)
|
|
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()
|
|
if !m.IsInt64() || m.Int64() > math.MaxInt32 {
|
|
return errors.New("m should 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(m.Int64()), pubs)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
ic.VM.Estack().PushVal(hash.Hash160(script).BytesBE())
|
|
return nil
|
|
}
|
|
|
|
// contractCreateStandardAccount calculates contract scripthash for a given public key.
|
|
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().PushVal(p.GetScriptHash().BytesBE())
|
|
return nil
|
|
}
|
|
|
|
// contractGetCallFlags returns current context calling flags.
|
|
func contractGetCallFlags(ic *interop.Context) error {
|
|
ic.VM.Estack().PushVal(ic.VM.Context().GetCallFlags())
|
|
return nil
|
|
}
|