/
exit.go
235 lines (188 loc) · 6.07 KB
/
exit.go
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package exit
import (
"bytes"
"encoding/hex"
"errors"
"fmt"
"math/big"
"strconv"
"github.com/spf13/cobra"
"github.com/umbracle/ethgo"
"github.com/umbracle/ethgo/jsonrpc"
"github.com/0xPolygon/polygon-edge/command"
"github.com/0xPolygon/polygon-edge/command/bridge/common"
cmdHelper "github.com/0xPolygon/polygon-edge/command/helper"
"github.com/0xPolygon/polygon-edge/command/rootchain/helper"
"github.com/0xPolygon/polygon-edge/consensus/polybft/contractsapi"
"github.com/0xPolygon/polygon-edge/txrelayer"
"github.com/0xPolygon/polygon-edge/types"
)
const (
// flag names
exitHelperFlag = "exit-helper"
exitEventIDFlag = "exit-id"
rootJSONRPCFlag = "root-json-rpc"
childJSONRPCFlag = "child-json-rpc"
// generateExitProofFn is JSON RPC endpoint which creates exit proof
generateExitProofFn = "bridge_generateExitProof"
)
type exitParams struct {
senderKey string
exitHelperAddrRaw string
exitID uint64
rootJSONRPCAddr string
childJSONRPCAddr string
isTestMode bool
}
var (
// ep represents exit command parameters
ep *exitParams = &exitParams{}
)
// GetCommand returns the bridge exit command
func GetCommand() *cobra.Command {
exitCmd := &cobra.Command{
Use: "exit",
Short: "Sends exit transaction to the Exit helper contract on the root chain",
Run: run,
}
exitCmd.Flags().StringVar(
&ep.senderKey,
common.SenderKeyFlag,
"",
"hex encoded private key of the account which sends exit transaction to the root chain",
)
exitCmd.Flags().StringVar(
&ep.exitHelperAddrRaw,
exitHelperFlag,
"",
"address of ExitHelper smart contract on root chain",
)
exitCmd.Flags().Uint64Var(
&ep.exitID,
exitEventIDFlag,
0,
"child chain exit event ID",
)
exitCmd.Flags().StringVar(
&ep.rootJSONRPCAddr,
rootJSONRPCFlag,
txrelayer.DefaultRPCAddress,
"the JSON RPC root chain endpoint",
)
exitCmd.Flags().StringVar(
&ep.childJSONRPCAddr,
childJSONRPCFlag,
"http://127.0.0.1:9545",
"the JSON RPC child chain endpoint",
)
exitCmd.Flags().BoolVar(
&ep.isTestMode,
helper.TestModeFlag,
false,
"test indicates whether exit transaction sender is hardcoded test account",
)
_ = exitCmd.MarkFlagRequired(exitHelperFlag)
exitCmd.MarkFlagsMutuallyExclusive(helper.TestModeFlag, common.SenderKeyFlag)
return exitCmd
}
func run(cmd *cobra.Command, _ []string) {
outputter := command.InitializeOutputter(cmd)
defer outputter.WriteOutput()
senderKey, err := helper.DecodePrivateKey(ep.senderKey)
if err != nil {
outputter.SetError(fmt.Errorf("failed to create wallet from private key: %w", err))
return
}
rootTxRelayer, err := txrelayer.NewTxRelayer(txrelayer.WithIPAddress(ep.rootJSONRPCAddr))
if err != nil {
outputter.SetError(fmt.Errorf("could not create root chain tx relayer: %w", err))
return
}
childClient, err := jsonrpc.NewClient(ep.childJSONRPCAddr)
if err != nil {
outputter.SetError(fmt.Errorf("could not create child chain JSON RPC client: %w", err))
return
}
// acquire proof for given exit event
var proof types.Proof
err = childClient.Call(generateExitProofFn, &proof, fmt.Sprintf("0x%x", ep.exitID))
if err != nil {
outputter.SetError(fmt.Errorf("failed to get exit proof (exit id=%d): %w", ep.exitID, err))
return
}
// create exit transaction
txn, exitEvent, err := createExitTxn(senderKey.Address(), proof)
if err != nil {
outputter.SetError(fmt.Errorf("failed to create tx input: %w", err))
return
}
// send exit transaction
receipt, err := rootTxRelayer.SendTransaction(txn, senderKey)
if err != nil {
outputter.SetError(fmt.Errorf("failed to send exit transaction (exit id=%d): %w", ep.exitID, err))
return
}
if receipt.Status == uint64(types.ReceiptFailed) {
outputter.SetError(fmt.Errorf("failed to execute exit transaction (exit id=%d)", ep.exitID))
return
}
outputter.SetCommandResult(&exitResult{
ID: strconv.FormatUint(exitEvent.ID.Uint64(), 10),
Sender: exitEvent.Sender.String(),
Receiver: exitEvent.Receiver.String(),
})
}
// createExitTxn encodes parameters for exit function on root chain ExitHelper contract
func createExitTxn(sender ethgo.Address, proof types.Proof) (*ethgo.Transaction,
*contractsapi.L2StateSyncedEvent, error) {
leafIndex, ok := proof.Metadata["LeafIndex"].(float64)
if !ok {
return nil, nil, errors.New("failed to convert proof leaf index")
}
checkpointBlock, ok := proof.Metadata["CheckpointBlock"].(float64)
if !ok {
return nil, nil, errors.New("failed to convert proof checkpoint block")
}
exitEventHex, ok := proof.Metadata["ExitEvent"].(string)
if !ok {
return nil, nil, errors.New("failed to convert exit event")
}
exitEventEncoded, err := hex.DecodeString(exitEventHex)
if err != nil {
return nil, nil, fmt.Errorf("failed to decode hex-encoded exit event '%s': %w", exitEventHex, err)
}
exitEvent := new(contractsapi.L2StateSyncedEvent)
if err := exitEvent.Decode(exitEventEncoded); err != nil {
return nil, nil, fmt.Errorf("failed to decode exit event: %w", err)
}
exitFn := &contractsapi.ExitExitHelperFn{
BlockNumber: new(big.Int).SetUint64(uint64(checkpointBlock)),
LeafIndex: new(big.Int).SetUint64(uint64(leafIndex)),
UnhashedLeaf: exitEventEncoded,
Proof: proof.Data,
}
input, err := exitFn.EncodeAbi()
if err != nil {
return nil, nil, fmt.Errorf("failed to encode provided parameters: %w", err)
}
exitHelperAddr := ethgo.Address(types.StringToAddress(ep.exitHelperAddrRaw))
txn := helper.CreateTransaction(sender, &exitHelperAddr, input, nil, true)
txn.Gas = txrelayer.DefaultGasLimit
return txn, exitEvent, err
}
type exitResult struct {
ID string `json:"id"`
Sender string `json:"sender"`
Receiver string `json:"receiver"`
}
func (r *exitResult) GetOutput() string {
var buffer bytes.Buffer
vals := make([]string, 0, 3)
vals = append(vals, fmt.Sprintf("Exit Event ID|%s", r.ID))
vals = append(vals, fmt.Sprintf("Sender|%s", r.Sender))
vals = append(vals, fmt.Sprintf("Receiver|%s", r.Receiver))
buffer.WriteString("\n[EXIT TRANSACTION RELAYER]\n")
buffer.WriteString(cmdHelper.FormatKV(vals))
buffer.WriteString("\n")
return buffer.String()
}