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local_relayer.go
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local_relayer.go
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package relayer
import (
"context"
"fmt"
"math/big"
"time"
"github.com/0xsequence/ethkit/ethreceipts"
"github.com/0xsequence/ethkit/ethrpc"
"github.com/0xsequence/ethkit/ethtxn"
"github.com/0xsequence/ethkit/ethwallet"
"github.com/0xsequence/ethkit/go-ethereum"
"github.com/0xsequence/ethkit/go-ethereum/common"
"github.com/0xsequence/ethkit/go-ethereum/core/types"
"github.com/0xsequence/go-sequence"
"github.com/0xsequence/go-sequence/contracts"
"github.com/0xsequence/go-sequence/core"
"github.com/0xsequence/go-sequence/relayer/proto"
)
// LocalRelayer is a simple implementation of a relayer which will dispatch
// meta transactions locally. This should only be used for testing / debugging,
// and never seriously in a real app.
type LocalRelayer struct {
Sender *ethwallet.Wallet
receiptListener *ethreceipts.ReceiptsListener
}
var _ sequence.Relayer = &LocalRelayer{}
func NewLocalRelayer(sender *ethwallet.Wallet, receiptListener *ethreceipts.ReceiptsListener) (*LocalRelayer, error) {
if sender.GetProvider() == nil {
return nil, sequence.ErrProviderNotSet
}
return &LocalRelayer{
Sender: sender,
receiptListener: receiptListener,
}, nil
}
func (r *LocalRelayer) GetProvider() *ethrpc.Provider {
if r.Sender == nil || r.Sender.GetProvider() == nil {
return nil
}
return r.Sender.GetProvider()
}
func (r *LocalRelayer) EstimateGasLimits(ctx context.Context, walletConfig core.WalletConfig, walletContext sequence.WalletContext, txns sequence.Transactions) (sequence.Transactions, error) {
walletAddress, err := sequence.AddressFromWalletConfig(walletConfig, walletContext)
if err != nil {
return nil, err
}
provider := r.GetProvider()
isWalletDeployed, err := sequence.IsWalletDeployed(provider, walletAddress)
if err != nil {
return nil, err
}
defaultGasLimit := int64(800_000)
encodedTxns, err := txns.EncodedTransactions()
if err != nil {
return nil, err
}
for i := range encodedTxns {
txn := &encodedTxns[i]
// Respect gasLimit request of the transaction (as long as its not 0)
if txn.GasLimit != nil && txn.GasLimit.Cmp(big.NewInt(0)) > 0 {
continue
}
// Fee can't be estimated locally for delegateCalls
if txn.DelegateCall {
txn.GasLimit = big.NewInt(int64(defaultGasLimit))
continue
}
// Fee can't be estimated for self-called if wallet hasn't been deployed
if txn.To == walletAddress && !isWalletDeployed {
txn.GasLimit = big.NewInt(int64(defaultGasLimit))
continue
}
// Estimate with eth_estimate call
callMsg := ethereum.CallMsg{
From: walletAddress,
Gas: 0, // estimating this value
Value: txn.Value,
Data: txn.Data,
}
zeroAddress := common.Address{}
if txn.To != zeroAddress {
callMsg.To = &txn.To
}
gasLimit, err := provider.EstimateGas(ctx, callMsg)
if err != nil {
txn.GasLimit = big.NewInt(int64(defaultGasLimit))
continue
}
txn.GasLimit = big.NewInt(0).SetUint64(gasLimit)
}
// update gasLimit on original transactions
for i, txn := range txns {
txn.GasLimit = encodedTxns[i].GasLimit
}
return txns, nil
}
func (r *LocalRelayer) GetNonce(ctx context.Context, walletConfig core.WalletConfig, walletContext sequence.WalletContext, space *big.Int, blockNum *big.Int) (*big.Int, error) {
return sequence.GetWalletNonce(r.GetProvider(), walletConfig, walletContext, space, blockNum)
}
func (r *LocalRelayer) Simulate(ctx context.Context, txs *sequence.SignedTransactions) ([]*sequence.RelayerSimulateResult, error) {
//TODO implement me
panic("implement me")
}
func (r *LocalRelayer) Relay(ctx context.Context, signedTxs *sequence.SignedTransactions, quote ...*sequence.RelayerFeeQuote) (sequence.MetaTxnID, *types.Transaction, ethtxn.WaitReceipt, error) {
// NOTE: this implementation assumes the wallet is deployed and does not do automatic bundle creation (aka prepending / bundling
// a wallet creation call)
// TODO: lets update LocalRelayer so it'll do auto-bundle creation.. to prepend, and send to guestModule, etc..
// its more consistent, and easier for tests..
sender := r.Sender
to, execdata, err := sequence.EncodeTransactionsForRelaying(
r,
signedTxs.WalletAddress,
signedTxs.WalletConfig,
signedTxs.WalletContext,
signedTxs.Transactions,
signedTxs.Nonce,
signedTxs.Signature,
)
if err != nil {
return "", nil, nil, err
}
if r.IsDeployTransaction(signedTxs) {
to = signedTxs.WalletContext.GuestModuleAddress
} else {
isDeployed, err := sequence.IsWalletDeployed(r.GetProvider(), to)
if err != nil {
return "", nil, nil, err
}
if !isDeployed {
_, factoryAddress, deployData, err := sequence.EncodeWalletDeployment(signedTxs.WalletConfig, signedTxs.WalletContext)
if err != nil {
return "", nil, nil, err
}
txns := sequence.Transactions{
{
RevertOnError: true,
To: factoryAddress,
Data: deployData,
},
{
RevertOnError: true,
To: to,
Data: execdata,
},
}
encodedTxns, err := txns.EncodedTransactions()
if err != nil {
return "", nil, nil, err
}
execdata, err = contracts.WalletMainModule.Encode("execute", encodedTxns, big.NewInt(0), []byte{})
if err != nil {
return "", nil, nil, err
}
to = signedTxs.WalletContext.GuestModuleAddress
}
}
walletAddress, err := sequence.AddressFromWalletConfig(signedTxs.WalletConfig, signedTxs.WalletContext)
if err != nil {
return "", nil, nil, err
}
metaTxnID, _, err := sequence.ComputeMetaTxnID(signedTxs.ChainID, walletAddress, signedTxs.Transactions, signedTxs.Nonce, sequence.MetaTxnWalletExec)
if err != nil {
return "", nil, nil, err
}
ntx, err := sender.NewTransaction(ctx, ðtxn.TransactionRequest{
To: &to, Data: execdata,
})
if err != nil {
return metaTxnID, nil, nil, err
}
signedTx, err := sender.SignTx(ntx, signedTxs.ChainID)
if err != nil {
return metaTxnID, nil, nil, err
}
ntx, waitReceipt, err := sender.SendTransaction(ctx, signedTx)
if err != nil {
return metaTxnID, nil, nil, err
}
return metaTxnID, ntx, waitReceipt, nil
}
func (r *LocalRelayer) Wait(ctx context.Context, metaTxnID sequence.MetaTxnID, optTimeout ...time.Duration) (sequence.MetaTxnStatus, *types.Receipt, error) {
if r.receiptListener == nil {
return 0, nil, fmt.Errorf("relayer: failed to wait for metaTxnID as receiptListener is not set")
}
result, receipt, _, err := sequence.FetchMetaTransactionReceipt(ctx, r.receiptListener, metaTxnID, optTimeout...)
if err != nil {
return 0, nil, err
}
var status sequence.MetaTxnStatus
if result != nil {
status = result.Status
}
return status, receipt.Receipt(), nil
}
func (r *LocalRelayer) FeeOptions(ctx context.Context, signedTxs *sequence.SignedTransactions) ([]*sequence.RelayerFeeOption, *sequence.RelayerFeeQuote, error) {
return nil, nil, nil
}
func (r *LocalRelayer) IsDeployTransaction(signedTxs *sequence.SignedTransactions) bool {
for _, txn := range signedTxs.Transactions {
if txn.To == signedTxs.WalletContext.FactoryAddress {
return true
}
}
return false
}
func (r *LocalRelayer) Client() proto.Relayer {
// no relayer used
return nil
}