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native.go
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native.go
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/*
* Copyright (C) 2018 The ZeepinChain Authors
* This file is part of The ZeepinChain library.
*
* The ZeepinChain is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ZeepinChain is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with The ZeepinChain. If not, see <http://www.gnu.org/licenses/>.
*/
package embed
import (
"bytes"
"fmt"
"reflect"
"math/big"
"github.com/zeepin/ZeepinChain/common"
"github.com/zeepin/ZeepinChain/common/serialization"
vm "github.com/zeepin/ZeepinChain/embed/simulator"
"github.com/zeepin/ZeepinChain/embed/simulator/types"
"github.com/zeepin/ZeepinChain/smartcontract/service/native"
"github.com/zeepin/ZeepinChain/smartcontract/states"
)
func NativeInvoke(service *EmbeddedService, engine *vm.ExecutionEngine) error {
count := vm.EvaluationStackCount(engine)
if count < 4 {
return fmt.Errorf("invoke native contract invalid parameters %d < 4 ", count)
}
version, err := vm.PopInt(engine)
if err != nil {
return err
}
address, err := vm.PopByteArray(engine)
if err != nil {
return err
}
addr, err := common.AddressParseFromBytes(address)
if err != nil {
return fmt.Errorf("invoke native contract:%s, address invalid", address)
}
method, err := vm.PopByteArray(engine)
if err != nil {
return err
}
if len(method) > METHOD_LENGTH_LIMIT {
return fmt.Errorf("invoke native contract:%s method:%s too long, over max length 1024 limit", address, method)
}
args := vm.PopStackItem(engine)
buf := new(bytes.Buffer)
if err := BuildParamToNative(buf, args); err != nil {
return err
}
contract := &states.Contract{
Version: byte(version),
Address: addr,
Method: string(method),
Args: buf.Bytes(),
}
sink := common.ZeroCopySink{}
contract.Serialization(&sink)
native := &native.NativeService{
CloneCache: service.CloneCache,
Code: sink.Bytes(),
Tx: service.Tx,
Height: service.Height,
Time: service.Time,
ContextRef: service.ContextRef,
ServiceMap: make(map[string]native.Handler),
}
result, err := native.Invoke()
if err != nil {
return err
}
vm.PushData(engine, result)
return nil
}
func BuildParamToNative(bf *bytes.Buffer, item types.StackItems) error {
switch item.(type) {
case *types.ByteArray:
a, _ := item.GetByteArray()
if err := serialization.WriteVarBytes(bf, a); err != nil {
return err
}
case *types.Integer:
i, _ := item.GetByteArray()
if err := serialization.WriteVarBytes(bf, i); err != nil {
return err
}
case *types.Boolean:
b, _ := item.GetBoolean()
if err := serialization.WriteBool(bf, b); err != nil {
return err
}
case *types.Array:
arr, _ := item.GetArray()
if err := serialization.WriteVarBytes(bf, types.BigIntToBytes(big.NewInt(int64(len(arr))))); err != nil {
return err
}
for _, v := range arr {
if err := BuildParamToNative(bf, v); err != nil {
return err
}
}
case *types.Struct:
st, _ := item.GetStruct()
for _, v := range st {
if err := BuildParamToNative(bf, v); err != nil {
return err
}
}
default:
return fmt.Errorf("convert embedded params to native invalid type support: %s", reflect.TypeOf(item))
}
return nil
}