rpc: eth_feeHistory (#734)

* Problem: missing json rpc of eth_feeHistory #685

add oracle backend

space ready

structure ok

refactoring

return feehistory

data flow ok

basefee

set gas used ratio

computing reward

add testing

add gas used

prepare data

fill reward

increase coin

fixing api

add mac

add launch

gas used ratio ok

print element

reward workes

reward working

fix panic

value correct

remove debugging log

tidy up

tidy up

remove oracle

tidy up

fix handler crash

add unit test

tidy up

add limit check

reformat

fix lint

fix lint

fix lint

fix lint

Update rpc/ethereum/backend/feebackend.go

thanks

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

Update rpc/ethereum/backend/feebackend.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

Update rpc/ethereum/backend/feebackend.go

thanks

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

Update rpc/ethereum/backend/feebackend.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

fix compile error

split lines

remove temporary string conversion

return error if gaslimit is 0

move OneFeeHistory to types

add comment

only err check

Update rpc/ethereum/backend/feebackend.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

Update rpc/ethereum/backend/feebackend.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

tidy up

add feehistory-cap

* Apply suggestions from code review

* changelog

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>
Co-authored-by: Federico Kunze Küllmer <federico.kunze94@gmail.com>

CHANGELOG.md

@@ -51,6 +51,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * (evm) [tharsis#662](https://github.com/tharsis/ethermint/pull/662) Disable basefee for non london blocks
 * (cmd) [tharsis#712](https://github.com/tharsis/ethermint/pull/712) add tx cli to build evm transaction
 * (rpc) [tharsis#733](https://github.com/tharsis/ethermint/pull/733) add JSON_RPC endpoint `personal_unpair`
+* (rpc) [tharsis#734](https://github.com/tharsis/ethermint/pull/734) add JSON_RPC endpoint `eth_feeHistory`
 * (rpc) [tharsis#740](https://github.com/tharsis/ethermint/pull/740) add JSON_RPC endpoint `personal_initializeWallet`
 * (rpc) [tharsis#743](https://github.com/tharsis/ethermint/pull/743) add JSON_RPC endpoint `debug_traceBlockByHash`
 * (rpc) [tharsis#748](https://github.com/tharsis/ethermint/pull/748) add JSON_RPC endpoint `personal_listWallets`

rpc/ethereum/backend/backend.go

@@ -15,6 +15,7 @@ import (
 	authtx "github.com/cosmos/cosmos-sdk/x/auth/tx"
 	"github.com/ethereum/go-ethereum/accounts/keystore"
 	"github.com/ethereum/go-ethereum/params"
+	"github.com/ethereum/go-ethereum/rpc"
 	tmrpctypes "github.com/tendermint/tendermint/rpc/core/types"
 
 	"google.golang.org/grpc"
@@ -42,6 +43,9 @@ import (
 // Backend implements the functionality shared within namespaces.
 // Implemented by EVMBackend.
 type Backend interface {
+	// Fee API
+	FeeHistory(blockCount rpc.DecimalOrHex, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (*types.FeeHistoryResult, error)
+
 	// General Ethereum API
 	RPCGasCap() uint64            // global gas cap for eth_call over rpc: DoS protection
 	RPCEVMTimeout() time.Duration // global timeout for eth_call over rpc: DoS protection
@@ -76,7 +80,6 @@ type Backend interface {
 	GetLogs(hash common.Hash) ([][]*ethtypes.Log, error)
 	GetLogsByHeight(height *int64) ([][]*ethtypes.Log, error)
 	GetFilteredBlocks(from int64, to int64, filter [][]filters.BloomIV, filterAddresses bool) ([]int64, error)
-
 	ChainConfig() *params.ChainConfig
 	SetTxDefaults(args evmtypes.TransactionArgs) (evmtypes.TransactionArgs, error)
 	GetEthereumMsgsFromTendermintBlock(block *tmrpctypes.ResultBlock) []*evmtypes.MsgEthereumTx
@@ -889,6 +892,11 @@ func (e *EVMBackend) RPCFilterCap() int32 {
 	return e.cfg.JSONRPC.FilterCap
 }
 
+// RPCFeeHistoryCap is the limit for total number of blocks that can be fetched
+func (e *EVMBackend) RPCFeeHistoryCap() int32 {
+	return e.cfg.JSONRPC.FeeHistoryCap
+}
+
 // RPCMinGasPrice returns the minimum gas price for a transaction obtained from
 // the node config. If set value is 0, it will default to 20.
 

rpc/ethereum/backend/feebackend.go

@@ -0,0 +1,198 @@
+package backend
+
+import (
+	"fmt"
+	"math/big"
+	"sort"
+
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/rpc"
+	tmrpctypes "github.com/tendermint/tendermint/rpc/core/types"
+	rpctypes "github.com/tharsis/ethermint/rpc/ethereum/types"
+	evmtypes "github.com/tharsis/ethermint/x/evm/types"
+)
+
+type (
+	txGasAndReward struct {
+		gasUsed uint64
+		reward  *big.Int
+	}
+	sortGasAndReward []txGasAndReward
+)
+
+func (s sortGasAndReward) Len() int { return len(s) }
+func (s sortGasAndReward) Swap(i, j int) {
+	s[i], s[j] = s[j], s[i]
+}
+
+func (s sortGasAndReward) Less(i, j int) bool {
+	return s[i].reward.Cmp(s[j].reward) < 0
+}
+
+// output: targetOneFeeHistory
+func (e *EVMBackend) processBlock(
+	tendermintBlock *tmrpctypes.ResultBlock,
+	ethBlock *map[string]interface{},
+	rewardPercentiles []float64,
+	tendermintBlockResult *tmrpctypes.ResultBlockResults,
+	targetOneFeeHistory *rpctypes.OneFeeHistory) error {
+	blockHeight := tendermintBlock.Block.Height
+	blockBaseFee, err := e.BaseFee(blockHeight)
+	if err != nil {
+		return err
+	}
+
+	// set basefee
+	targetOneFeeHistory.BaseFee = blockBaseFee
+
+	// set gasused ratio
+	gasLimitUint64 := (*ethBlock)["gasLimit"].(hexutil.Uint64)
+	gasUsedBig := (*ethBlock)["gasUsed"].(*hexutil.Big)
+	gasusedfloat, _ := new(big.Float).SetInt(gasUsedBig.ToInt()).Float64()
+
+	if gasLimitUint64 <= 0 {
+		return fmt.Errorf("gasLimit of block height %d should be bigger than 0 , current gaslimit %d", blockHeight, gasLimitUint64)
+	}
+
+	gasUsedRatio := gasusedfloat / float64(gasLimitUint64)
+	blockGasUsed := gasusedfloat
+	targetOneFeeHistory.GasUsedRatio = gasUsedRatio
+
+	rewardCount := len(rewardPercentiles)
+	targetOneFeeHistory.Reward = make([]*big.Int, rewardCount)
+	for i := 0; i < rewardCount; i++ {
+		targetOneFeeHistory.Reward[i] = big.NewInt(2000)
+	}
+
+	// check tendermintTxs
+	tendermintTxs := tendermintBlock.Block.Txs
+	tendermintTxResults := tendermintBlockResult.TxsResults
+	tendermintTxCount := len(tendermintTxs)
+	sorter := make(sortGasAndReward, tendermintTxCount)
+
+	for i := 0; i < tendermintTxCount; i++ {
+		eachTendermintTx := tendermintTxs[i]
+		eachTendermintTxResult := tendermintTxResults[i]
+
+		tx, err := e.clientCtx.TxConfig.TxDecoder()(eachTendermintTx)
+		if err != nil {
+			e.logger.Debug("failed to decode transaction in block", "height", blockHeight, "error", err.Error())
+			continue
+		}
+		txGasUsed := uint64(eachTendermintTxResult.GasUsed)
+		for _, msg := range tx.GetMsgs() {
+			ethMsg, ok := msg.(*evmtypes.MsgEthereumTx)
+			if !ok {
+				continue
+			}
+			tx := ethMsg.AsTransaction()
+			reward := tx.EffectiveGasTipValue(blockBaseFee)
+			sorter[i] = txGasAndReward{gasUsed: txGasUsed, reward: reward}
+			break
+		}
+	}
+	sort.Sort(sorter)
+
+	var txIndex int
+	sumGasUsed := uint64(0)
+	if len(sorter) > 0 {
+		sumGasUsed = sorter[0].gasUsed
+	}
+	for i, p := range rewardPercentiles {
+		thresholdGasUsed := uint64(blockGasUsed * p / 100)
+		for sumGasUsed < thresholdGasUsed && txIndex < tendermintTxCount-1 {
+			txIndex++
+			sumGasUsed += sorter[txIndex].gasUsed
+		}
+
+		chosenReward := big.NewInt(0)
+		if 0 <= txIndex && txIndex < len(sorter) {
+			chosenReward = sorter[txIndex].reward
+		}
+		targetOneFeeHistory.Reward[i] = chosenReward
+	}
+
+	return nil
+}
+
+func (e *EVMBackend) FeeHistory(
+	userBlockCount rpc.DecimalOrHex, // number blocks to fetch, maximum is 100
+	lastBlock rpc.BlockNumber, // the block to start search , to oldest
+	rewardPercentiles []float64, // percentiles to fetch reward
+) (*rpctypes.FeeHistoryResult, error) {
+	blockEnd := int64(lastBlock)
+
+	if blockEnd <= 0 {
+		blockNumber, err := e.BlockNumber()
+		if err != nil {
+			return nil, err
+		}
+		blockEnd = int64(blockNumber)
+	}
+	userBlockCountInt := int64(userBlockCount)
+	maxBlockCount := int64(e.cfg.JSONRPC.FeeHistoryCap)
+	if userBlockCountInt > maxBlockCount {
+		return nil, fmt.Errorf("FeeHistory user block count %d higher than %d", userBlockCountInt, maxBlockCount)
+	}
+	blockStart := blockEnd - userBlockCountInt
+	if blockStart < 0 {
+		blockStart = 0
+	}
+
+	blockCount := blockEnd - blockStart
+
+	oldestBlock := (*hexutil.Big)(big.NewInt(blockStart))
+
+	// prepare space
+	reward := make([][]*hexutil.Big, blockCount)
+	rewardcount := len(rewardPercentiles)
+	for i := 0; i < int(blockCount); i++ {
+		reward[i] = make([]*hexutil.Big, rewardcount)
+	}
+	thisBaseFee := make([]*hexutil.Big, blockCount)
+	thisGasUsedRatio := make([]float64, blockCount)
+
+	// fetch block
+	for blockID := blockStart; blockID < blockEnd; blockID++ {
+		index := int32(blockID - blockStart)
+		// eth block
+		ethBlock, err := e.GetBlockByNumber(rpctypes.BlockNumber(blockID), true)
+		if ethBlock == nil {
+			return nil, err
+		}
+
+		// tendermint block
+		tendermintblock, err := e.GetTendermintBlockByNumber(rpctypes.BlockNumber(blockID))
+		if tendermintblock == nil {
+			return nil, err
+		}
+
+		// tendermint block result
+		tendermintBlockResult, err := e.clientCtx.Client.BlockResults(e.ctx, &tendermintblock.Block.Height)
+		if tendermintBlockResult == nil {
+			e.logger.Debug("block result not found", "height", tendermintblock.Block.Height, "error", err.Error())
+			return nil, err
+		}
+
+		onefeehistory := rpctypes.OneFeeHistory{}
+		err = e.processBlock(tendermintblock, &ethBlock, rewardPercentiles, tendermintBlockResult, &onefeehistory)
+		if err != nil {
+			return nil, err
+		}
+
+		// copy
+		thisBaseFee[index] = (*hexutil.Big)(onefeehistory.BaseFee)
+		thisGasUsedRatio[index] = onefeehistory.GasUsedRatio
+		for j := 0; j < rewardcount; j++ {
+			reward[index][j] = (*hexutil.Big)(onefeehistory.Reward[j])
+		}
+	}
+
+	feeHistory := rpctypes.FeeHistoryResult{
+		OldestBlock:  oldestBlock,
+		Reward:       reward,
+		BaseFee:      thisBaseFee,
+		GasUsedRatio: thisGasUsedRatio,
+	}
+	return &feeHistory, nil
+}

rpc/ethereum/namespaces/eth/api.go

@@ -212,8 +212,7 @@ func (e *PublicAPI) MaxPriorityFeePerGas() (*hexutil.Big, error) {
 
 func (e *PublicAPI) FeeHistory(blockCount rpc.DecimalOrHex, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (*rpctypes.FeeHistoryResult, error) {
 	e.logger.Debug("eth_feeHistory")
-
+	return e.backend.FeeHistory(blockCount, lastBlock, rewardPercentiles)
-	return nil, fmt.Errorf("eth_feeHistory not implemented")
 }
 
 // Accounts returns the list of accounts available to this node.

rpc/ethereum/types/types.go

@@ -1,6 +1,8 @@
 package types
 
 import (
+	"math/big"
+
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	ethtypes "github.com/ethereum/go-ethereum/core/types"
@@ -79,3 +81,9 @@ type SignTransactionResult struct {
 	Raw hexutil.Bytes         `json:"raw"`
 	Tx  *ethtypes.Transaction `json:"tx"`
 }
+
+type OneFeeHistory struct {
+	BaseFee      *big.Int   // base fee  for each block
+	Reward       []*big.Int // each element of the array will have the tip provided to miners for the percentile given
+	GasUsedRatio float64    // the ratio of gas used to the gas limit for each block
+}

server/config/config.go

@@ -32,6 +32,8 @@ const (
 
 	DefaultFilterCap int32 = 200
 
+	DefaultFeeHistoryCap int32 = 100
+
 	DefaultEVMTimeout = 5 * time.Second
 	// default 1.0 eth
 	DefaultTxFeeCap float64 = 1.0
@@ -72,6 +74,8 @@ type JSONRPCConfig struct {
 	TxFeeCap float64 `mapstructure:"txfee-cap"`
 	// FilterCap is the global cap for total number of filters that can be created.
 	FilterCap int32 `mapstructure:"filter-cap"`
+	// FeeHistoryCap is the global cap for total number of blocks that can be fetched
+	FeeHistoryCap int32 `mapstructure:"feehistory-cap"`
 	// Enable defines if the EVM RPC server should be enabled.
 	Enable bool `mapstructure:"enable"`
 }
@@ -161,6 +165,7 @@ func DefaultJSONRPCConfig() *JSONRPCConfig {
 		EVMTimeout:    DefaultEVMTimeout,
 		TxFeeCap:      DefaultTxFeeCap,
 		FilterCap:     DefaultFilterCap,
+		FeeHistoryCap: DefaultFeeHistoryCap,
 	}
 }
 
@@ -174,6 +179,10 @@ func (c JSONRPCConfig) Validate() error {
 		return errors.New("JSON-RPC filter-cap cannot be negative")
 	}
 
+	if c.FeeHistoryCap <= 0 {
+		return errors.New("JSON-RPC feehistory-cap cannot be negative or 0")
+	}
+
 	if c.TxFeeCap < 0 {
 		return errors.New("JSON-RPC tx fee cap cannot be negative")
 	}
@@ -236,6 +245,7 @@ func GetConfig(v *viper.Viper) Config {
 			WsAddress:     v.GetString("json-rpc.ws-address"),
 			GasCap:        v.GetUint64("json-rpc.gas-cap"),
 			FilterCap:     v.GetInt32("json-rpc.filter-cap"),
+			FeeHistoryCap: v.GetInt32("json-rpc.feehistory-cap"),
 			TxFeeCap:      v.GetFloat64("json-rpc.txfee-cap"),
 			EVMTimeout:    v.GetDuration("json-rpc.evm-timeout"),
 		},

server/config/toml.go

@@ -44,6 +44,10 @@ txfee-cap = {{ .JSONRPC.TxFeeCap }}
 # FilterCap sets the global cap for total number of filters that can be created
 filter-cap = {{ .JSONRPC.FilterCap }}
 
+# FeeHistoryCap sets the global cap for total number of blocks that can be fetched
+feehistory-cap = {{ .JSONRPC.FeeHistoryCap }}
+
+
 ###############################################################################
 ###                             TLS Configuration                           ###
 ###############################################################################

server/flags/flags.go

@@ -34,6 +34,7 @@ const (
 	JSONRPCEVMTimeout   = "json-rpc.evm-timeout"
 	JSONRPCTxFeeCap     = "json-rpc.txfee-cap"
 	JSONRPCFilterCap    = "json-rpc.filter-cap"
+	JSONRPFeeHistoryCap = "json-rpc.feehistory-cap"
 )
 
 // EVM flags

tests/rpc/rpc_test.go

@@ -1053,3 +1053,24 @@ func TestEth_EthResend(t *testing.T) {
 	_, rpcerror := callWithError("eth_resend", param)
 	require.Equal(t, "transaction 0x3bf28b46ee1bb3925e50ec6003f899f95913db4b0f579c4e7e887efebf9ecd1b not found", fmt.Sprintf("%s", rpcerror))
 }
+
+func TestEth_FeeHistory(t *testing.T) {
+	params := make([]interface{}, 0)
+	params = append(params, 4)
+	params = append(params, "0x1c")
+	params = append(params, []int{25, 75})
+
+	rpcRes := call(t, "eth_feeHistory", params)
+
+	info := make(map[string]interface{})
+	err := json.Unmarshal(rpcRes.Result, &info)
+	require.NoError(t, err)
+	reward := info["reward"].([]interface{})
+	baseFeePerGas := info["baseFeePerGas"].([]interface{})
+	gasUsedRatio := info["gasUsedRatio"].([]interface{})
+
+	require.Equal(t, info["oldestBlock"].(string), "0x18")
+	require.Equal(t, 4, len(gasUsedRatio))
+	require.Equal(t, 4, len(baseFeePerGas))
+	require.Equal(t, 4, len(reward))
+}

x/evm/keeper/grpc_query_test.go

@@ -632,7 +632,8 @@ func (suite *KeeperTestSuite) TestTraceTx() {
 			expPass:       true,
 			traceResponse: []byte{0x7b, 0x22, 0x67, 0x61, 0x73, 0x22, 0x3a, 0x33, 0x34, 0x38, 0x32, 0x38, 0x2c, 0x22, 0x66, 0x61, 0x69, 0x6c, 0x65, 0x64, 0x22, 0x3a, 0x66, 0x61, 0x6c, 0x73, 0x65, 0x2c, 0x22, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x56, 0x61, 0x6c, 0x75, 0x65, 0x22, 0x3a, 0x22, 0x22, 0x2c, 0x22, 0x73, 0x74, 0x72, 0x75, 0x63, 0x74, 0x4c, 0x6f, 0x67, 0x73, 0x22, 0x3a, 0x5b, 0x7b, 0x22, 0x70, 0x63, 0x22, 0x3a, 0x30, 0x2c, 0x22, 0x6f, 0x70, 0x22, 0x3a, 0x22, 0x50, 0x55, 0x53, 0x48, 0x31, 0x22, 0x2c, 0x22, 0x67, 0x61, 0x73, 0x22, 0x3a, 0x33, 0x30, 0x32, 0x39, 0x36, 0x2c, 0x22, 0x67, 0x61, 0x73, 0x43, 0x6f, 0x73, 0x74, 0x22, 0x3a, 0x33, 0x2c, 0x22, 0x64, 0x65, 0x70, 0x74, 0x68, 0x22, 0x3a, 0x31, 0x7d, 0x2c, 0x7b, 0x22, 0x70, 0x63, 0x22, 0x3a, 0x32, 0x2c, 0x22, 0x6f, 0x70, 0x22, 0x3a, 0x22, 0x50, 0x55, 0x53, 0x48, 0x31, 0x22, 0x2c, 0x22, 0x67, 0x61, 0x73, 0x22, 0x3a, 0x33, 0x30, 0x32, 0x39, 0x33, 0x2c, 0x22, 0x67},
 			dynamicTxFee:  false,
-		}, {
+		},
+		{
 			msg: "javascript tracer",
 			malleate: func() {
 				txIndex = 0
@@ -658,7 +659,8 @@ func (suite *KeeperTestSuite) TestTraceTx() {
 			expPass:       true,
 			traceResponse: []byte{0x7b, 0x22, 0x67, 0x61, 0x73, 0x22, 0x3a, 0x33, 0x34, 0x38, 0x32, 0x38, 0x2c, 0x22, 0x66, 0x61, 0x69, 0x6c, 0x65, 0x64, 0x22, 0x3a, 0x66, 0x61, 0x6c, 0x73, 0x65, 0x2c, 0x22, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x56, 0x61, 0x6c, 0x75, 0x65, 0x22, 0x3a, 0x22, 0x22, 0x2c, 0x22, 0x73, 0x74, 0x72, 0x75, 0x63, 0x74, 0x4c, 0x6f, 0x67, 0x73, 0x22, 0x3a, 0x5b, 0x7b, 0x22, 0x70, 0x63, 0x22, 0x3a, 0x30, 0x2c, 0x22, 0x6f, 0x70, 0x22, 0x3a, 0x22, 0x50, 0x55, 0x53, 0x48, 0x31, 0x22, 0x2c, 0x22, 0x67, 0x61, 0x73, 0x22, 0x3a, 0x33, 0x30, 0x32, 0x39, 0x36, 0x2c, 0x22, 0x67, 0x61, 0x73, 0x43, 0x6f, 0x73, 0x74, 0x22, 0x3a, 0x33, 0x2c, 0x22, 0x64, 0x65, 0x70, 0x74, 0x68, 0x22, 0x3a, 0x31, 0x7d, 0x2c, 0x7b, 0x22, 0x70, 0x63, 0x22, 0x3a, 0x32, 0x2c, 0x22, 0x6f, 0x70, 0x22, 0x3a, 0x22, 0x50, 0x55, 0x53, 0x48, 0x31, 0x22, 0x2c, 0x22, 0x67, 0x61, 0x73, 0x22, 0x3a, 0x33, 0x30, 0x32, 0x39, 0x33, 0x2c, 0x22, 0x67},
 			dynamicTxFee:  true,
-		}, {
+		},
+		{
 			msg: "javascript tracer with dynamicTxFee",
 			malleate: func() {
 				txIndex = 0
@@ -762,7 +764,8 @@ func (suite *KeeperTestSuite) TestTraceBlock() {
 			},
 			expPass:       true,
 			traceResponse: []byte{0x5b, 0x7b, 0x22, 0x72, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x22, 0x3a, 0x7b, 0x22, 0x67, 0x61, 0x73, 0x22, 0x3a, 0x33, 0x34, 0x38, 0x32, 0x38, 0x2c, 0x22, 0x66, 0x61, 0x69, 0x6c, 0x65, 0x64, 0x22, 0x3a, 0x66, 0x61, 0x6c, 0x73, 0x65, 0x2c, 0x22, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x56, 0x61, 0x6c, 0x75, 0x65, 0x22, 0x3a, 0x22, 0x22, 0x2c, 0x22, 0x73, 0x74, 0x72, 0x75, 0x63, 0x74, 0x4c, 0x6f, 0x67, 0x73, 0x22, 0x3a, 0x5b, 0x7b, 0x22, 0x70, 0x63, 0x22, 0x3a, 0x30, 0x2c, 0x22, 0x6f, 0x70, 0x22, 0x3a, 0x22, 0x50, 0x55, 0x53, 0x48, 0x31, 0x22, 0x2c, 0x22, 0x67, 0x61, 0x73, 0x22, 0x3a, 0x33, 0x30, 0x32, 0x39, 0x36, 0x2c, 0x22, 0x67, 0x61, 0x73, 0x43, 0x6f, 0x73, 0x74, 0x22, 0x3a, 0x33, 0x2c, 0x22, 0x64, 0x65, 0x70, 0x74, 0x68, 0x22, 0x3a, 0x31, 0x7d, 0x2c, 0x7b, 0x22, 0x70, 0x63, 0x22, 0x3a, 0x32, 0x2c, 0x22, 0x6f, 0x70, 0x22, 0x3a, 0x22, 0x50, 0x55, 0x53, 0x48, 0x31, 0x22, 0x2c, 0x22, 0x67, 0x61},
-		}, {
+		},
+		{
 			msg: "javascript tracer",
 			malleate: func() {
 				traceConfig = &types.TraceConfig{
@@ -784,7 +787,8 @@ func (suite *KeeperTestSuite) TestTraceBlock() {
 			expPass:       true,
 			traceResponse: []byte{0x5b, 0x7b, 0x22, 0x72, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x22, 0x3a, 0x7b, 0x22, 0x67, 0x61, 0x73, 0x22, 0x3a, 0x33, 0x34, 0x38, 0x32, 0x38, 0x2c, 0x22, 0x66, 0x61, 0x69, 0x6c, 0x65, 0x64, 0x22, 0x3a, 0x66, 0x61, 0x6c, 0x73, 0x65, 0x2c, 0x22, 0x72, 0x65, 0x74, 0x75, 0x72, 0x6e, 0x56, 0x61, 0x6c, 0x75, 0x65, 0x22, 0x3a, 0x22, 0x22, 0x2c, 0x22, 0x73, 0x74, 0x72, 0x75, 0x63, 0x74, 0x4c, 0x6f, 0x67, 0x73, 0x22, 0x3a, 0x5b, 0x7b, 0x22, 0x70, 0x63, 0x22, 0x3a, 0x30, 0x2c, 0x22, 0x6f, 0x70, 0x22, 0x3a, 0x22, 0x50, 0x55, 0x53, 0x48, 0x31, 0x22, 0x2c, 0x22, 0x67, 0x61, 0x73, 0x22, 0x3a, 0x33, 0x30, 0x32, 0x39, 0x36, 0x2c, 0x22, 0x67, 0x61, 0x73, 0x43, 0x6f, 0x73, 0x74, 0x22, 0x3a, 0x33, 0x2c, 0x22, 0x64, 0x65, 0x70, 0x74, 0x68, 0x22, 0x3a, 0x31, 0x7d, 0x2c, 0x7b, 0x22, 0x70, 0x63, 0x22, 0x3a, 0x32, 0x2c, 0x22, 0x6f, 0x70, 0x22, 0x3a, 0x22, 0x50, 0x55, 0x53, 0x48, 0x31, 0x22, 0x2c, 0x22, 0x67, 0x61},
 			dynamicTxFee:  true,
-		}, {
+		},
+		{
 			msg: "javascript tracer with dynamicTxFee",
 			malleate: func() {
 				traceConfig = &types.TraceConfig{

x/evm/keeper/keeper_test.go

@@ -111,7 +111,7 @@ func (suite *KeeperTestSuite) DoSetupTest(t require.TestingT) {
 		stateBytes, err := tmjson.MarshalIndent(genesisState, "", " ")
 		require.NoError(t, err)
 
-		//Initialize the chain
+		// Initialize the chain
 		suite.app.InitChain(
 			abci.RequestInitChain{
 				ChainId:         "ethermint_9000-1",

x/evm/keeper/state_transition_test.go

@@ -436,7 +436,6 @@ func (suite *KeeperTestSuite) TestRefundGas() {
 			} else {
 				suite.Require().Error(err)
 			}
-
 		})
 	}
 	suite.mintFeeCollector = false

x/evm/types/msg_test.go

@@ -363,7 +363,7 @@ func encodeDecodeBinary(tx *ethtypes.Transaction) (*types.MsgEthereumTx, error)
 	if err != nil {
 		return nil, fmt.Errorf("rlp encoding failed: %v", err)
 	}
-	var parsedTx = &types.MsgEthereumTx{}
+	parsedTx := &types.MsgEthereumTx{}
 	if err := parsedTx.UnmarshalBinary(data); err != nil {
 		return nil, fmt.Errorf("rlp decoding failed: %v", err)
 	}