lint fix

testutil/sample/common.go

@@ -30,29 +30,32 @@ func PubKeySet() *common.PubKeySet {
 	return &pubKeySet
 }
 
-func Proof() (tx_index int64, block *ethtypes.Block, header ethtypes.Header, headerRLP []byte, proof *common.Proof, tx *ethtypes.Transaction, err error) {
-	tx_index = int64(9)
-	RPC_URL := "https://rpc.ankr.com/eth_goerli"
-	client, err := ethclient.Dial(RPC_URL)
+func Proof() (txIndex int64, block *ethtypes.Block, header ethtypes.Header, headerRLP []byte, proof *common.Proof, tx *ethtypes.Transaction, err error) {
+	txIndex = int64(9)
+	url := "https://rpc.ankr.com/eth_goerli"
+	client, err := ethclient.Dial(url)
 	if err != nil {
 		return
 	}
 	bn := int64(9889649)
 	block, err = client.BlockByNumber(context.Background(), big.NewInt(bn))
+	if err != nil {
+		return
+	}
 	headerRLP, _ = rlp.EncodeToBytes(block.Header())
 	err = rlp.DecodeBytes(headerRLP, &header)
 	if err != nil {
 		return
 	}
 	tr := ethereum.NewTrie(block.Transactions())
 	var b []byte
-	ib := rlp.AppendUint64(b, uint64(tx_index))
+	ib := rlp.AppendUint64(b, uint64(txIndex))
 	p := ethereum.NewProof()
 	err = tr.Prove(ib, 0, p)
 	if err != nil {
 		return
 	}
 	proof = common.NewEthereumProof(p)
-	tx = block.Transactions()[tx_index]
+	tx = block.Transactions()[txIndex]
 	return
 }