EstimateTransferERC20Fee & EstimateTransferFee

Author: ranjbar-dev

cmd/main.go

@@ -16,7 +16,7 @@ func main() {
 
 	token := &EthereumWallet.Token{ContractAddress: enums.GOERLI_USDC}
 	w, _ := EthereumWallet.CreateEthereumWallet(node, "a24031202755246def61140ae1bce297d0c4886b2faea5ce79001748ef97e8ec")
-	fmt.Println(w.EstimateTransferERC20Fee(token, "0x75c07e7207Bb00Cf60c77f2506D7CE2B8d18bf0f"))
+	fmt.Println(w.EstimateTransferERC20Fee(token))
 	fmt.Println(w.TransferERC20(token, "0x75c07e7207Bb00Cf60c77f2506D7CE2B8d18bf0f", big.NewInt(10)))
 	return
 }

fee.go

@@ -5,7 +5,6 @@ import (
 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ranjbar-dev/ethereum-wallet/geth"
-	"golang.org/x/crypto/sha3"
 	"math/big"
 )
 
@@ -49,7 +48,7 @@ func estimateEthTransactionFee(node Node, toAddressHex string) (int64, error) {
 	return temp.Int64(), nil
 }
 
-func estimateErc20TransactionFee(node Node, toAddressHex string) (int64, error) {
+func estimateErc20TransactionFee(node Node) (int64, error) {
 
 	client, err := geth.GetGETHClient(node.Http)
 	if err != nil {
@@ -72,44 +71,11 @@ func estimateErc20TransactionFee(node Node, toAddressHex string) (int64, error)
 		return 0, err
 	}
 
-	gasLimit, err := erc20GasLimit(node, toAddressHex)
-	if err != nil {
-		return 0, err
-	}
+	gasLimit := 70000
 
 	fee := new(big.Int).SetInt64(baseFee.Int64() + gasTipCap.Int64())
 
 	temp := new(big.Int).Mul(new(big.Int).SetInt64(int64(gasLimit)), fee)
 
 	return temp.Int64(), nil
 }
-
-func erc20GasLimit(node Node, toAddressHex string) (uint64, error) {
-	toAddress := common.HexToAddress(toAddressHex)
-
-	client, err := geth.GetGETHClient(node.Http)
-	if err != nil {
-		return 0, err
-	}
-
-	transferFnSignature := []byte("transfer(address,uint256)")
-	hash := sha3.NewLegacyKeccak256()
-	hash.Write(transferFnSignature)
-	methodID := hash.Sum(nil)[:4]
-
-	paddedAddress := common.LeftPadBytes(toAddress.Bytes(), 32)
-
-	amount := new(big.Int)
-	amount.SetString("1000000000000000000000000", 10) // 1000 tokens
-	paddedAmount := common.LeftPadBytes(amount.Bytes(), 32)
-
-	var data []byte
-	data = append(data, methodID...)
-	data = append(data, paddedAddress...)
-	data = append(data, paddedAmount...)
-
-	return client.EstimateGas(context.Background(), ethereum.CallMsg{
-		To:   &toAddress,
-		Data: data,
-	})
-}

transaction.go

@@ -124,10 +124,7 @@ func createERC20Transaction(node Node, toAddressHex string, c *ethclient.Client,
 		return nil, err
 	}
 
-	gasLimit, err := erc20GasLimit(node, toAddressHex)
-	if err != nil {
-		return nil, err
-	}
+	gasLimit := uint64(70000)
 
 	return &bind.TransactOpts{
 		From:      fromAddress,

wallet.go

@@ -212,7 +212,7 @@ func (ew *EthereumWallet) TransferERC20(t *Token, toAddressHex string, amountInT
 	return tx.Hash().Hex(), nil
 }
 
-func (ew *EthereumWallet) EstimateTransferERC20Fee(t *Token, toAddressHex string) (int64, error) {
+func (ew *EthereumWallet) EstimateTransferERC20Fee(t *Token) (int64, error) {
 
-	return estimateErc20TransactionFee(ew.Node, toAddressHex)
+	return estimateErc20TransactionFee(ew.Node)
 }