neo-go/pkg/vm/interop.go

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package vm
import (
"errors"
"fmt"
"sort"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
"github.com/nspcc-dev/neo-go/pkg/vm/emit"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// InteropFunc allows to hook into the VM.
type InteropFunc func(vm *VM) error
// InteropFuncPrice represents an interop function with a price.
type InteropFuncPrice struct {
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Func InteropFunc
Price int64
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// AllowedTriggers is a mask representing triggers which should be allowed by an interop.
// 0 is interpreted as All.
AllowedTriggers trigger.Type
RequiredFlags smartcontract.CallFlag
}
// interopIDFuncPrice adds an ID to the InteropFuncPrice.
type interopIDFuncPrice struct {
ID uint32
InteropFuncPrice
}
// InteropGetterFunc is a function that returns an interop function-price
// structure by the given interop ID.
type InteropGetterFunc func(uint32) *InteropFuncPrice
var defaultVMInterops = []interopIDFuncPrice{
{emit.InteropNameToID([]byte("System.Binary.Deserialize")),
InteropFuncPrice{Func: RuntimeDeserialize, Price: 500000}},
{emit.InteropNameToID([]byte("System.Binary.Serialize")),
InteropFuncPrice{Func: RuntimeSerialize, Price: 100000}},
{emit.InteropNameToID([]byte("System.Runtime.Log")),
InteropFuncPrice{Func: runtimeLog, Price: 1000000, RequiredFlags: smartcontract.AllowNotify}},
{emit.InteropNameToID([]byte("System.Runtime.Notify")),
InteropFuncPrice{Func: runtimeNotify, Price: 1000000, RequiredFlags: smartcontract.AllowNotify}},
{emit.InteropNameToID([]byte("System.Enumerator.Create")),
InteropFuncPrice{Func: EnumeratorCreate, Price: 400}},
{emit.InteropNameToID([]byte("System.Enumerator.Next")),
InteropFuncPrice{Func: EnumeratorNext, Price: 1000000}},
{emit.InteropNameToID([]byte("System.Enumerator.Concat")),
InteropFuncPrice{Func: EnumeratorConcat, Price: 400}},
{emit.InteropNameToID([]byte("System.Enumerator.Value")),
InteropFuncPrice{Func: EnumeratorValue, Price: 400}},
{emit.InteropNameToID([]byte("System.Iterator.Create")),
InteropFuncPrice{Func: IteratorCreate, Price: 400}},
{emit.InteropNameToID([]byte("System.Iterator.Concat")),
InteropFuncPrice{Func: IteratorConcat, Price: 400}},
{emit.InteropNameToID([]byte("System.Iterator.Key")),
InteropFuncPrice{Func: IteratorKey, Price: 400}},
{emit.InteropNameToID([]byte("System.Iterator.Keys")),
InteropFuncPrice{Func: IteratorKeys, Price: 400}},
{emit.InteropNameToID([]byte("System.Iterator.Values")),
InteropFuncPrice{Func: IteratorValues, Price: 400}},
}
func getDefaultVMInterop(id uint32) *InteropFuncPrice {
n := sort.Search(len(defaultVMInterops), func(i int) bool {
return defaultVMInterops[i].ID >= id
})
if n < len(defaultVMInterops) && defaultVMInterops[n].ID == id {
return &defaultVMInterops[n].InteropFuncPrice
}
return nil
}
// runtimeLog handles the syscall "System.Runtime.Log" for printing and logging stuff.
func runtimeLog(vm *VM) error {
item := vm.Estack().Pop()
fmt.Printf("NEO-GO-VM (log) > %s\n", item.Value())
return nil
}
// runtimeNotify handles the syscall "System.Runtime.Notify" for printing and logging stuff.
func runtimeNotify(vm *VM) error {
item := vm.Estack().Pop()
fmt.Printf("NEO-GO-VM (notify) > %s\n", item.Value())
return nil
}
// RuntimeSerialize handles System.Binary.Serialize syscall.
func RuntimeSerialize(vm *VM) error {
item := vm.Estack().Pop()
data, err := stackitem.SerializeItem(item.value)
if err != nil {
return err
} else if len(data) > stackitem.MaxSize {
return errors.New("too big item")
}
vm.Estack().PushVal(data)
return nil
}
// RuntimeDeserialize handles System.Binary.Deserialize syscall.
func RuntimeDeserialize(vm *VM) error {
data := vm.Estack().Pop().Bytes()
item, err := stackitem.DeserializeItem(data)
if err != nil {
return err
}
vm.Estack().Push(&Element{value: item})
return nil
}
// init sorts the global defaultVMInterops value.
func init() {
sort.Slice(defaultVMInterops, func(i, j int) bool {
return defaultVMInterops[i].ID < defaultVMInterops[j].ID
})
}
// EnumeratorCreate handles syscall System.Enumerator.Create.
func EnumeratorCreate(v *VM) error {
data := v.Estack().Pop().Array()
v.Estack().Push(&Element{
value: stackitem.NewInterop(&arrayWrapper{
index: -1,
value: data,
}),
})
return nil
}
// EnumeratorNext handles syscall System.Enumerator.Next.
func EnumeratorNext(v *VM) error {
iop := v.Estack().Pop().Interop()
arr := iop.Value().(enumerator)
v.Estack().PushVal(arr.Next())
return nil
}
// EnumeratorValue handles syscall System.Enumerator.Value.
func EnumeratorValue(v *VM) error {
iop := v.Estack().Pop().Interop()
arr := iop.Value().(enumerator)
v.Estack().Push(&Element{value: arr.Value()})
return nil
}
// EnumeratorConcat handles syscall System.Enumerator.Concat.
func EnumeratorConcat(v *VM) error {
iop1 := v.Estack().Pop().Interop()
arr1 := iop1.Value().(enumerator)
iop2 := v.Estack().Pop().Interop()
arr2 := iop2.Value().(enumerator)
v.Estack().Push(&Element{
value: stackitem.NewInterop(&concatEnum{
current: arr1,
second: arr2,
}),
})
return nil
}
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// IteratorCreate handles syscall System.Iterator.Create.
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func IteratorCreate(v *VM) error {
data := v.Estack().Pop()
var item stackitem.Item
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switch t := data.value.(type) {
case *stackitem.Array, *stackitem.Struct:
item = stackitem.NewInterop(&arrayWrapper{
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index: -1,
value: t.Value().([]stackitem.Item),
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})
case *stackitem.Map:
item = NewMapIterator(t)
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default:
return errors.New("non-iterable type")
}
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v.Estack().Push(&Element{value: item})
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return nil
}
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// NewMapIterator returns new interop item containing iterator over m.
func NewMapIterator(m *stackitem.Map) *stackitem.Interop {
return stackitem.NewInterop(&mapWrapper{
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index: -1,
m: m.Value().([]stackitem.MapElement),
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})
}
// IteratorConcat handles syscall System.Iterator.Concat.
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func IteratorConcat(v *VM) error {
iop1 := v.Estack().Pop().Interop()
iter1 := iop1.Value().(iterator)
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iop2 := v.Estack().Pop().Interop()
iter2 := iop2.Value().(iterator)
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v.Estack().Push(&Element{value: stackitem.NewInterop(
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&concatIter{
current: iter1,
second: iter2,
},
)})
return nil
}
// IteratorKey handles syscall System.Iterator.Key.
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func IteratorKey(v *VM) error {
iop := v.estack.Pop().Interop()
iter := iop.Value().(iterator)
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v.Estack().Push(&Element{value: iter.Key()})
return nil
}
// IteratorKeys handles syscall System.Iterator.Keys.
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func IteratorKeys(v *VM) error {
iop := v.estack.Pop().Interop()
iter := iop.Value().(iterator)
v.Estack().Push(&Element{value: stackitem.NewInterop(
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&keysWrapper{iter},
)})
return nil
}
// IteratorValues handles syscall System.Iterator.Values.
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func IteratorValues(v *VM) error {
iop := v.estack.Pop().Interop()
iter := iop.Value().(iterator)
v.Estack().Push(&Element{value: stackitem.NewInterop(
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&valuesWrapper{iter},
)})
return nil
}