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feebackend.go
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feebackend.go
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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
}
// FeeHistory returns data relevant for fee estimation based on the specified range of blocks.
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)
// rewards should only be calculated if reward percentiles were included
calculateRewards := rewardCount != 0
// 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, ðBlock, rewardPercentiles, tendermintBlockResult, &oneFeeHistory)
if err != nil {
return nil, err
}
// copy
thisBaseFee[index] = (*hexutil.Big)(oneFeeHistory.BaseFee)
thisGasUsedRatio[index] = oneFeeHistory.GasUsedRatio
if calculateRewards {
for j := 0; j < rewardCount; j++ {
reward[index][j] = (*hexutil.Big)(oneFeeHistory.Reward[j])
if reward[index][j] == nil {
reward[index][j] = (*hexutil.Big)(big.NewInt(0))
}
}
}
}
feeHistory := rpctypes.FeeHistoryResult{
OldestBlock: oldestBlock,
BaseFee: thisBaseFee,
GasUsedRatio: thisGasUsedRatio,
}
if calculateRewards {
feeHistory.Reward = reward
}
return &feeHistory, nil
}