Feat: estimate bundle gas

pkg/eth/simulator.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"math/big"
 
+	"github.com/KyberNetwork/tradinglib/pkg/mev"
 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
@@ -28,33 +29,13 @@ func (s *Simulator) EstimateGasWithOverrides(
 ) (uint64, error) {
 	var hex hexutil.Uint64
 	err := s.c.CallContext(
-		ctx, &hex, "eth_estimateGas", toCallArg(msg),
+		ctx, &hex, "eth_estimateGas", mev.ToCallArg(msg),
 		toBlockNumArg(blockNumber), overrides,
 	)
 
 	return uint64(hex), err
 }
 
-func toCallArg(msg ethereum.CallMsg) interface{} {
-	arg := map[string]interface{}{
-		"from": msg.From,
-		"to":   msg.To,
-	}
-	if len(msg.Data) > 0 {
-		arg["input"] = hexutil.Bytes(msg.Data)
-	}
-	if msg.Value != nil {
-		arg["value"] = (*hexutil.Big)(msg.Value)
-	}
-	if msg.Gas != 0 {
-		arg["gas"] = hexutil.Uint64(msg.Gas)
-	}
-	if msg.GasPrice != nil {
-		arg["gasPrice"] = (*hexutil.Big)(msg.GasPrice)
-	}
-	return arg
-}
-
 func toBlockNumArg(number *big.Int) string {
 	if number == nil {
 		return "latest"

pkg/mev/blxr_bundle_sender.go

@@ -9,8 +9,10 @@ import (
 	"net/http"
 	"strconv"
 
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/ethclient/gethclient"
 	"github.com/flashbots/mev-share-node/mevshare"
 )
 
@@ -32,6 +34,14 @@ type BloxrouteClient struct {
 	enabledBuilders []BlxrBuilder
 }
 
+func (s *BloxrouteClient) EstimateBundleGas(
+	_ context.Context,
+	_ []ethereum.CallMsg,
+	_ *map[common.Address]gethclient.OverrideAccount,
+) ([]uint64, error) {
+	return nil, nil
+}
+
 func (s *BloxrouteClient) MevSimulateBundle(
 	_ uint64,
 	_ common.Hash,

pkg/mev/bundle_sender.go

@@ -9,11 +9,13 @@ import (
 	"net/http"
 
 	"github.com/duoxehyon/mev-share-go/rpc"
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
+	"github.com/ethereum/go-ethereum/ethclient/gethclient"
 	"github.com/flashbots/mev-share-node/mevshare"
 )
 
@@ -26,7 +28,8 @@ type Client struct {
 	cancelBySendBundle bool
 	senderType         BundleSenderType
 	// mevShareClient is the client for mev-share flashbots node
-	mevShareClient rpc.MevAPIClient
+	mevShareClient     rpc.MevAPIClient
+	gasBundleEstimator IGasBundleEstimator
 }
 
 // NewClient set the flashbotKey to nil will skip adding the signature header.
@@ -36,7 +39,8 @@ func NewClient(
 	flashbotKey *ecdsa.PrivateKey,
 	cancelBySendBundle bool,
 	senderType BundleSenderType,
-) *Client {
+	gasBundleEstimator IGasBundleEstimator,
+) (*Client, error) {
 	var mevShareClient rpc.MevAPIClient
 	if flashbotKey != nil {
 		mevShareClient = rpc.NewClient(endpoint, flashbotKey)
@@ -49,7 +53,8 @@ func NewClient(
 		cancelBySendBundle: cancelBySendBundle,
 		senderType:         senderType,
 		mevShareClient:     mevShareClient,
-	}
+		gasBundleEstimator: gasBundleEstimator,
+	}, nil
 }
 
 func (s *Client) GetSenderType() BundleSenderType {
@@ -124,6 +129,14 @@ func (s *Client) flashbotBackrunSendBundle(
 	return res, err
 }
 
+func (s *Client) EstimateBundleGas(
+	ctx context.Context,
+	messages []ethereum.CallMsg,
+	overrides *map[common.Address]gethclient.OverrideAccount,
+) ([]uint64, error) {
+	return s.gasBundleEstimator.EstimateBundleGas(ctx, messages, overrides)
+}
+
 func (s *Client) MevSimulateBundle(
 	blockNumber uint64,
 	pendingTxHash common.Hash,

pkg/mev/bundle_sender_test.go

@@ -66,7 +66,11 @@ func TestSendBundle(t *testing.T) {
 	t.Log("new tx", signedTx.Hash().String())
 
 	uuid := uuid.NewString()
-	sender := mev.NewClient(client, endpoint, privateKey, false, mev.BundleSenderTypeFlashbot)
+	ethClient, err = ethclient.Dial(endpoint)
+	require.NoError(t, err)
+	gasBundleEstimator := mev.NewGasBundleEstimator(ethClient.Client())
+	sender, err := mev.NewClient(client, endpoint, privateKey, false, mev.BundleSenderTypeFlashbot, gasBundleEstimator)
+	require.NoError(t, err)
 
 	resp, err := sender.SendBundle(ctx, &uuid, blockNumber+12, signedTx)
 	require.NoError(t, err) // sepolia: code: [-32000], message: [internal server error]
@@ -95,7 +99,12 @@ func TestCancelBeaver(t *testing.T) {
 		bundleUUID = uuid.New().String()
 	)
 
-	sender := mev.NewClient(client, endpoint, nil, true, mev.BundleSenderTypeBeaver)
+	ethClient, err := ethclient.Dial(endpoint)
+	require.NoError(t, err)
+	gasBundleEstimator := mev.NewGasBundleEstimator(ethClient.Client())
+
+	sender, err := mev.NewClient(client, endpoint, nil, true, mev.BundleSenderTypeBeaver, gasBundleEstimator)
+	require.NoError(t, err)
 
 	require.NoError(t, sender.CancelBundle(ctx, bundleUUID))
 }
@@ -129,10 +138,15 @@ func Test_SimulateBundle(t *testing.T) {
 		txs = append(txs, &tx)
 	}
 
-	var (
-		simulationEndpoint = "http://localhost:8545"
-		client             = mev.NewClient(http.DefaultClient, simulationEndpoint, nil, false, mev.BundleSenderTypeFlashbot)
-	)
+	simulationEndpoint := "http://localhost:8545"
+	ethClient, err := ethclient.Dial(simulationEndpoint)
+	require.NoError(t, err)
+	gasBundleEstimator := mev.NewGasBundleEstimator(ethClient.Client())
+
+	client, err := mev.NewClient(http.DefaultClient,
+		simulationEndpoint, nil, false,
+		mev.BundleSenderTypeFlashbot, gasBundleEstimator)
+	require.NoError(t, err)
 
 	simulationResponse, err := client.SimulateBundle(context.Background(), uint64(blockNumber), txs...)
 	require.NoError(t, err)

pkg/mev/gas_bundle_estimator.go

@@ -0,0 +1,50 @@
+package mev
+
+import (
+	"context"
+
+	"github.com/ethereum/go-ethereum"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/ethclient/gethclient"
+	"github.com/ethereum/go-ethereum/rpc"
+)
+
+type GasBundleEstimator struct {
+	client *rpc.Client
+}
+
+func NewGasBundleEstimator(client *rpc.Client) GasBundleEstimator {
+	return GasBundleEstimator{
+		client: client,
+	}
+}
+
+func (g GasBundleEstimator) EstimateBundleGas(
+	_ context.Context,
+	messages []ethereum.CallMsg,
+	overrides *map[common.Address]gethclient.OverrideAccount,
+) ([]uint64, error) {
+	bundles := make([]interface{}, 0, len(messages))
+	for _, msg := range messages {
+		bundles = append(bundles, ToCallArg(msg))
+	}
+
+	var gasEstimateCost []hexutil.Uint64
+
+	err := g.client.Call(
+		&gasEstimateCost, ETHEstimateGasBundleMethod,
+		map[string]interface{}{
+			"transactions": bundles,
+		}, "latest", overrides,
+	)
+	if err != nil {
+		return nil, err
+	}
+	result := make([]uint64, 0, len(gasEstimateCost))
+
+	for _, gasEstimate := range gasEstimateCost {
+		result = append(result, uint64(gasEstimate))
+	}
+	return result, nil
+}

pkg/mev/pkg.go

@@ -9,8 +9,11 @@ import (
 	"io"
 	"net/http"
 
+	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/ethclient/gethclient"
 	"github.com/flashbots/mev-share-node/mevshare"
 )
 
@@ -33,6 +36,7 @@ const (
 	ETHSendBundleMethod             = "eth_sendBundle"
 	EthCallBundleMethod             = "eth_callBundle"
 	ETHCancelBundleMethod           = "eth_cancelBundle"
+	ETHEstimateGasBundleMethod      = "eth_estimateGasBundle"
 	MevSendBundleMethod             = "mev_sendBundle"
 	MaxBlockFromTarget              = 3
 )
@@ -55,13 +59,26 @@ type IBundleSender interface {
 		ctx context.Context, bundleUUID string,
 	) error
 	SimulateBundle(ctx context.Context, blockNumber uint64, txs ...*types.Transaction) (SendBundleResponse, error)
+	EstimateBundleGas(
+		ctx context.Context,
+		messages []ethereum.CallMsg,
+		overrides *map[common.Address]gethclient.OverrideAccount,
+	) ([]uint64, error)
 	MevSimulateBundle(
 		blockNumber uint64,
 		pendingTxHash common.Hash,
 		tx *types.Transaction) (*mevshare.SimMevBundleResponse, error)
 	GetSenderType() BundleSenderType
 }
 
+type IGasBundleEstimator interface {
+	EstimateBundleGas(
+		ctx context.Context,
+		messages []ethereum.CallMsg,
+		overrides *map[common.Address]gethclient.OverrideAccount,
+	) ([]uint64, error)
+}
+
 var (
 	_ IBundleSender = &Client{}
 	_ IBundleSender = &BloxrouteClient{}
@@ -174,3 +191,28 @@ type TitanCancelBundleResponse struct {
 	Result  int             `json:"result,omitempty"`
 	Error   SendBundleError `json:"error,omitempty"`
 }
+
+func ToCallArg(msg ethereum.CallMsg) interface{} {
+	arg := map[string]interface{}{
+		"from": msg.From,
+		"to":   msg.To,
+	}
+	if len(msg.Data) > 0 {
+		arg["input"] = hexutil.Bytes(msg.Data)
+	}
+	if msg.Value != nil {
+		arg["value"] = (*hexutil.Big)(msg.Value)
+	}
+	if msg.Gas != 0 {
+		arg["gas"] = hexutil.Uint64(msg.Gas)
+	}
+	if msg.GasPrice != nil {
+		arg["gasPrice"] = (*hexutil.Big)(msg.GasPrice)
+	}
+	return arg
+}
+
+func GetFrom(tx *types.Transaction) (common.Address, error) {
+	from, err := types.Sender(types.LatestSignerForChainID(tx.ChainId()), tx)
+	return from, err
+}