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evm2cm.go
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evm2cm.go
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package evm
import (
"encoding/hex"
"errors"
"fmt"
"github.com/ethereum/go-ethereum/common"
"github.com/okex/exchain/libs/cosmos-sdk/baseapp"
sdk "github.com/okex/exchain/libs/cosmos-sdk/types"
"github.com/okex/exchain/x/evm/types"
)
var (
ErrNoMatchParam = errors.New("no match the abi param")
sysABIParser *types.ABI
)
const (
sysContractABI = `[{"inputs":[{"internalType":"string","name":"_data","type":"string"}],"name":"invoke","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"input","type":"string"}],"name":"query","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"}]`
sysContractInvokeFunction = "invoke"
sysContractQueryFunction = "query"
)
func init() {
RegisterHandle()
var err error
sysABIParser, err = types.NewABI(sysContractABI)
if err != nil {
panic(fmt.Sprintln("init system abi fail", err.Error()))
}
}
func SysABI() *types.ABI {
return sysABIParser
}
func RegisterHandle() {
baseapp.RegisterEvmResultConverter(EncodeResultData)
baseapp.RegisterEvmConvertJudge(EvmConvertJudge)
baseapp.RegisterEvmParamParse(EvmParamParse)
}
func EvmParamParse(msg sdk.Msg) ([]byte, error) {
evmTx, ok := msg.(*types.MsgEthereumTx)
if !ok {
return nil, fmt.Errorf("msg type is not a MsgEthereumTx")
}
value, err := ParseContractParam(evmTx.Data.Payload)
if err != nil {
return nil, err
}
return value, nil
}
func EvmConvertJudge(msg sdk.Msg) ([]byte, bool) {
if msg.Route() != types.ModuleName {
return nil, false
}
evmTx, ok := msg.(*types.MsgEthereumTx)
if !ok || evmTx.Data.Recipient == nil {
return nil, false
}
if !sysABIParser.IsMatchFunction(sysContractInvokeFunction, evmTx.Data.Payload) {
return nil, false
}
return evmTx.Data.Recipient[:], true
}
func ParseContractParam(input []byte) ([]byte, error) {
res, err := sysABIParser.DecodeInputParam(sysContractInvokeFunction, input)
if err != nil {
return nil, err
}
if len(res) != 1 {
return nil, ErrNoMatchParam
}
v, ok := res[0].(string)
if !ok {
return nil, ErrNoMatchParam
}
return DecodeParam([]byte(v))
}
func DecodeParam(data []byte) ([]byte, error) {
value, err := hex.DecodeString(string(data)) // this is json fmt
if err != nil {
return nil, err
}
return value, nil
}
func EncodeResultData(txHash, data []byte) ([]byte, error) {
ethHash := common.BytesToHash(txHash)
return types.EncodeResultData(&types.ResultData{Ret: data, TxHash: ethHash})
}
func IsMatchSystemContractFunction(data []byte) bool {
return sysABIParser.IsMatchFunction(sysContractInvokeFunction, data)
}
func IsMatchSystemContractQuery(data []byte) bool {
return sysABIParser.IsMatchFunction(sysContractQueryFunction, data)
}
func EncodeQueryOutput(data []byte) ([]byte, error) {
return sysABIParser.EncodeOutput(sysContractQueryFunction, data)
}