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state: allow to encode AppExecResult with recursive items

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1. Encode them to a special type, decode to `nil`.
2. `Interop` can be encoded in JSON, this info should also be preserved.
This commit is contained in:
Evgenii Stratonikov 2020-12-18 12:28:01 +03:00
parent c13d6ecc55
commit 8c22d27acc
6 changed files with 164 additions and 52 deletions
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14
pkg/core/blockchain_test.go
View file

@ -1539,3 +1539,17 @@ func TestRemoveUntraceable(t *testing.T) {
require.NoError(t, err)
require.Len(t, b.Transactions, 0)
}
func TestInvalidNotification(t *testing.T) {
bc := newTestChain(t)
defer bc.Close()
cs, _ := getTestContractState(bc)
require.NoError(t, bc.contracts.Management.PutContractState(bc.dao, cs))
aer, err := invokeContractMethod(bc, 1_00000000, cs.Hash, "invalidStack")
require.NoError(t, err)
require.Equal(t, 2, len(aer.Stack))
require.Nil(t, aer.Stack[0])
require.Equal(t, stackitem.InteropT, aer.Stack[1].Type())
}

9
pkg/core/interop_system_test.go
View file

@ -506,6 +506,10 @@ func getTestContractState(bc *Blockchain) (*state.Contract, *state.Contract) {
emit.String(w.BinWriter, "destroy")
emit.AppCall(w.BinWriter, mgmtHash)
emit.Opcodes(w.BinWriter, opcode.RET)
invalidStackOff := w.Len()
emit.Opcodes(w.BinWriter, opcode.NEWARRAY0, opcode.DUP, opcode.DUP, opcode.APPEND, opcode.NEWMAP)
emit.Syscall(w.BinWriter, interopnames.SystemIteratorCreate)
emit.Opcodes(w.BinWriter, opcode.RET)
script := w.Bytes()
h := hash.Hash160(script)
@ -604,6 +608,11 @@ func getTestContractState(bc *Blockchain) (*state.Contract, *state.Contract) {
Offset: destroyOff,
ReturnType: smartcontract.VoidType,
},
{
Name: "invalidStack",
Offset: invalidStackOff,
ReturnType: smartcontract.VoidType,
},
}
cs := &state.Contract{
Script: script,

49
pkg/core/state/notification_event.go
View file

@ -57,7 +57,11 @@ func (aer *AppExecResult) EncodeBinary(w *io.BinWriter) {
w.WriteB(byte(aer.Trigger))
w.WriteB(byte(aer.VMState))
w.WriteU64LE(uint64(aer.GasConsumed))
stackitem.EncodeBinaryStackItem(stackitem.NewArray(aer.Stack), w)
// Stack items are expected to be marshaled one by one.
w.WriteVarUint(uint64(len(aer.Stack)))
for _, it := range aer.Stack {
stackitem.EncodeBinaryStackItemAppExec(it, w)
}
w.WriteArray(aer.Events)
w.WriteVarBytes([]byte(aer.FaultException))
}
@ -68,15 +72,21 @@ func (aer *AppExecResult) DecodeBinary(r *io.BinReader) {
aer.Trigger = trigger.Type(r.ReadB())
aer.VMState = vm.State(r.ReadB())
aer.GasConsumed = int64(r.ReadU64LE())
item := stackitem.DecodeBinaryStackItem(r)
if r.Err == nil {
arr, ok := item.Value().([]stackitem.Item)
if !ok {
r.Err = errors.New("array expected")
sz := r.ReadVarUint()
if stackitem.MaxArraySize < sz && r.Err == nil {
r.Err = errors.New("invalid format")
}
if r.Err != nil {
return
}
arr := make([]stackitem.Item, sz)
for i := 0; i < int(sz); i++ {
arr[i] = stackitem.DecodeBinaryStackItemAppExec(r)
if r.Err != nil {
return
}
aer.Stack = arr
}
aer.Stack = arr
r.ReadArray(&aer.Events)
aer.FaultException = r.ReadString()
}
@ -182,23 +192,22 @@ type executionAux struct {
// MarshalJSON implements implements json.Marshaler interface.
func (e Execution) MarshalJSON() ([]byte, error) {
var st json.RawMessage
var errRecursive = []byte(`"error: recursive reference"`)
arr := make([]json.RawMessage, len(e.Stack))
for i := range arr {
if e.Stack[i] == nil {
arr[i] = errRecursive
continue
}
data, err := stackitem.ToJSONWithTypes(e.Stack[i])
if err != nil {
st = []byte(`"error: recursive reference"`)
break
data = errRecursive
}
arr[i] = data
}
var err error
if st == nil {
st, err = json.Marshal(arr)
if err != nil {
return nil, err
}
st, err := json.Marshal(arr)
if err != nil {
return nil, err
}
return json.Marshal(&executionAux{
Trigger: e.Trigger.String(),
@ -222,7 +231,11 @@ func (e *Execution) UnmarshalJSON(data []byte) error {
for i := range arr {
st[i], err = stackitem.FromJSONWithTypes(arr[i])
if err != nil {
break
var s string
if json.Unmarshal(arr[i], &s) != nil {
break
}
err = nil
}
}
if err == nil {

95
pkg/core/state/notification_event_test.go
View file

@ -6,6 +6,7 @@ import (
"github.com/nspcc-dev/neo-go/internal/random"
"github.com/nspcc-dev/neo-go/internal/testserdes"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
"github.com/nspcc-dev/neo-go/pkg/vm"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
@ -23,35 +24,63 @@ func TestEncodeDecodeNotificationEvent(t *testing.T) {
}
func TestEncodeDecodeAppExecResult(t *testing.T) {
t.Run("halt", func(t *testing.T) {
appExecResult := &AppExecResult{
newAer := func() *AppExecResult {
return &AppExecResult{
Container: random.Uint256(),
Execution: Execution{
Trigger: 1,
VMState: vm.HaltState,
GasConsumed: 10,
Stack: []stackitem.Item{},
Stack: []stackitem.Item{stackitem.NewBool(true)},
Events: []NotificationEvent{},
},
}
}
t.Run("halt", func(t *testing.T) {
appExecResult := newAer()
appExecResult.VMState = vm.HaltState
testserdes.EncodeDecodeBinary(t, appExecResult, new(AppExecResult))
})
t.Run("fault", func(t *testing.T) {
appExecResult := &AppExecResult{
Container: random.Uint256(),
Execution: Execution{
Trigger: 1,
VMState: vm.FaultState,
GasConsumed: 10,
Stack: []stackitem.Item{},
Events: []NotificationEvent{},
FaultException: "unhandled error",
},
}
appExecResult := newAer()
appExecResult.VMState = vm.FaultState
testserdes.EncodeDecodeBinary(t, appExecResult, new(AppExecResult))
})
t.Run("with interop", func(t *testing.T) {
appExecResult := newAer()
appExecResult.Stack = []stackitem.Item{stackitem.NewInterop(nil)}
testserdes.EncodeDecodeBinary(t, appExecResult, new(AppExecResult))
})
t.Run("recursive reference", func(t *testing.T) {
var arr = stackitem.NewArray(nil)
arr.Append(arr)
appExecResult := newAer()
appExecResult.Stack = []stackitem.Item{arr, stackitem.NewBool(true), stackitem.NewInterop(123)}
bs, err := testserdes.EncodeBinary(appExecResult)
require.NoError(t, err)
actual := new(AppExecResult)
require.NoError(t, testserdes.DecodeBinary(bs, actual))
require.Equal(t, 3, len(actual.Stack))
require.Nil(t, actual.Stack[0])
require.Equal(t, true, actual.Stack[1].Value())
require.Equal(t, stackitem.InteropT, actual.Stack[2].Type())
bs1, err := testserdes.EncodeBinary(actual)
require.NoError(t, err)
require.Equal(t, bs, bs1)
})
t.Run("invalid item type", func(t *testing.T) {
aer := newAer()
w := io.NewBufBinWriter()
w.WriteBytes(aer.Container[:])
w.WriteB(byte(aer.Trigger))
w.WriteB(byte(aer.VMState))
w.WriteU64LE(uint64(aer.GasConsumed))
stackitem.EncodeBinaryStackItem(stackitem.NewBool(true), w.BinWriter)
require.NoError(t, w.Err)
require.Error(t, testserdes.DecodeBinary(w.Bytes(), new(AppExecResult)))
})
}
func TestMarshalUnmarshalJSONNotificationEvent(t *testing.T) {
@ -127,7 +156,7 @@ func TestMarshalUnmarshalJSONAppExecResult(t *testing.T) {
Trigger: trigger.Application,
VMState: vm.FaultState,
GasConsumed: 10,
Stack: []stackitem.Item{},
Stack: []stackitem.Item{stackitem.NewBool(true)},
Events: []NotificationEvent{},
FaultException: "unhandled exception",
},
@ -149,20 +178,28 @@ func TestMarshalUnmarshalJSONAppExecResult(t *testing.T) {
})
t.Run("MarshalJSON recursive reference", func(t *testing.T) {
i := make([]stackitem.Item, 1)
recursive := stackitem.NewArray(i)
i[0] = recursive
errorCases := []*AppExecResult{
{
Execution: Execution{
Stack: i,
},
arr := stackitem.NewArray(nil)
arr.Append(arr)
errAer := &AppExecResult{
Execution: Execution{
Trigger: trigger.Application,
Stack: []stackitem.Item{arr, stackitem.NewBool(true), stackitem.NewInterop(123)},
},
}
for _, errCase := range errorCases {
_, err := json.Marshal(errCase)
require.NoError(t, err)
}
bs, err := json.Marshal(errAer)
require.NoError(t, err)
actual := new(AppExecResult)
require.NoError(t, json.Unmarshal(bs, actual))
require.Equal(t, 3, len(actual.Stack))
require.Nil(t, actual.Stack[0])
require.Equal(t, true, actual.Stack[1].Value())
require.Equal(t, stackitem.InteropT, actual.Stack[2].Type())
bs1, err := json.Marshal(actual)
require.NoError(t, err)
require.Equal(t, bs, bs1)
})
t.Run("UnmarshalJSON error", func(t *testing.T) {

48
pkg/vm/stackitem/serialization.go
View file

@ -23,14 +23,30 @@ func SerializeItem(item Item) ([]byte, error) {
// similar to io.Serializable's EncodeBinary, but works with Item
// interface.
func EncodeBinaryStackItem(item Item, w *io.BinWriter) {
serializeItemTo(item, w, make(map[Item]bool))
serializeItemTo(item, w, false, make(map[Item]bool))
}
func serializeItemTo(item Item, w *io.BinWriter, seen map[Item]bool) {
// EncodeBinaryStackItemAppExec encodes given Item into the given BinWriter. It's
// similar to EncodeBinaryStackItem but allows to encode interop (only type, value is lost).
func EncodeBinaryStackItemAppExec(item Item, w *io.BinWriter) {
bw := io.NewBufBinWriter()
serializeItemTo(item, bw.BinWriter, true, make(map[Item]bool))
if bw.Err != nil {
w.WriteBytes([]byte{byte(InvalidT)})
return
}
w.WriteBytes(bw.Bytes())
}
func serializeItemTo(item Item, w *io.BinWriter, allowInvalid bool, seen map[Item]bool) {
if seen[item] {
w.Err = errors.New("recursive structures can't be serialized")
return
}
if item == nil && allowInvalid {
w.WriteBytes([]byte{byte(InvalidT)})
return
}
switch t := item.(type) {
case *ByteArray:
@ -46,6 +62,10 @@ func serializeItemTo(item Item, w *io.BinWriter, seen map[Item]bool) {
w.WriteBytes([]byte{byte(IntegerT)})
w.WriteVarBytes(bigint.ToBytes(t.Value().(*big.Int)))
case *Interop:
if allowInvalid {
w.WriteBytes([]byte{byte(InteropT)})
return
}
w.Err = errors.New("interop item can't be serialized")
case *Array, *Struct:
seen[item] = true
@ -60,7 +80,7 @@ func serializeItemTo(item Item, w *io.BinWriter, seen map[Item]bool) {
arr := t.Value().([]Item)
w.WriteVarUint(uint64(len(arr)))
for i := range arr {
serializeItemTo(arr[i], w, seen)
serializeItemTo(arr[i], w, allowInvalid, seen)
}
case *Map:
seen[item] = true
@ -68,8 +88,8 @@ func serializeItemTo(item Item, w *io.BinWriter, seen map[Item]bool) {
w.WriteBytes([]byte{byte(MapT)})
w.WriteVarUint(uint64(len(t.Value().([]MapElement))))
for i := range t.Value().([]MapElement) {
serializeItemTo(t.Value().([]MapElement)[i].Key, w, seen)
serializeItemTo(t.Value().([]MapElement)[i].Value, w, seen)
serializeItemTo(t.Value().([]MapElement)[i].Key, w, allowInvalid, seen)
serializeItemTo(t.Value().([]MapElement)[i].Value, w, allowInvalid, seen)
}
case Null:
w.WriteB(byte(AnyT))
@ -91,6 +111,16 @@ func DeserializeItem(data []byte) (Item, error) {
// as a function because Item itself is an interface. Caveat: always check
// reader's error value before using the returned Item.
func DecodeBinaryStackItem(r *io.BinReader) Item {
return decodeBinaryStackItem(r, false)
}
// DecodeBinaryStackItemAppExec is similar to DecodeBinaryStackItem
// but allows Interop values to be present.
func DecodeBinaryStackItemAppExec(r *io.BinReader) Item {
return decodeBinaryStackItem(r, true)
}
func decodeBinaryStackItem(r *io.BinReader, allowInvalid bool) Item {
var t = Type(r.ReadB())
if r.Err != nil {
return nil
@ -132,7 +162,15 @@ func DecodeBinaryStackItem(r *io.BinReader) Item {
return m
case AnyT:
return Null{}
case InteropT:
if allowInvalid {
return NewInterop(nil)
}
fallthrough
default:
if t == InvalidT && allowInvalid {
return nil
}
r.Err = fmt.Errorf("unknown type: %v", t)
return nil
}

1
pkg/vm/stackitem/type.go
View file

@ -17,6 +17,7 @@ const (
StructT Type = 0x41
MapT Type = 0x48
InteropT Type = 0x60
InvalidT Type = 0xFF
)
// String implements fmt.Stringer interface.