277 lines
9.0 KiB
Go
277 lines
9.0 KiB
Go
// Copyright 2015 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package gasprice
|
|
|
|
import (
|
|
"context"
|
|
"math/big"
|
|
"sync"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/common/lru"
|
|
"github.com/ethereum/go-ethereum/core"
|
|
"github.com/ethereum/go-ethereum/core/types"
|
|
"github.com/ethereum/go-ethereum/event"
|
|
"github.com/ethereum/go-ethereum/log"
|
|
"github.com/ethereum/go-ethereum/params"
|
|
"github.com/ethereum/go-ethereum/rpc"
|
|
"golang.org/x/exp/slices"
|
|
)
|
|
|
|
const sampleNumber = 3 // Number of transactions sampled in a block
|
|
|
|
var (
|
|
DefaultMaxPrice = big.NewInt(500 * params.GWei)
|
|
DefaultIgnorePrice = big.NewInt(2 * params.Wei)
|
|
)
|
|
|
|
type Config struct {
|
|
Blocks int
|
|
Percentile int
|
|
MaxHeaderHistory uint64
|
|
MaxBlockHistory uint64
|
|
Default *big.Int `toml:",omitempty"`
|
|
MaxPrice *big.Int `toml:",omitempty"`
|
|
IgnorePrice *big.Int `toml:",omitempty"`
|
|
}
|
|
|
|
// OracleBackend includes all necessary background APIs for oracle.
|
|
type OracleBackend interface {
|
|
HeaderByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Header, error)
|
|
BlockByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Block, error)
|
|
GetReceipts(ctx context.Context, hash common.Hash) (types.Receipts, error)
|
|
PendingBlockAndReceipts() (*types.Block, types.Receipts)
|
|
ChainConfig() *params.ChainConfig
|
|
SubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent) event.Subscription
|
|
}
|
|
|
|
// Oracle recommends gas prices based on the content of recent
|
|
// blocks. Suitable for both light and full clients.
|
|
type Oracle struct {
|
|
backend OracleBackend
|
|
lastHead common.Hash
|
|
lastPrice *big.Int
|
|
maxPrice *big.Int
|
|
ignorePrice *big.Int
|
|
cacheLock sync.RWMutex
|
|
fetchLock sync.Mutex
|
|
|
|
checkBlocks, percentile int
|
|
maxHeaderHistory, maxBlockHistory uint64
|
|
|
|
historyCache *lru.Cache[cacheKey, processedFees]
|
|
}
|
|
|
|
// NewOracle returns a new gasprice oracle which can recommend suitable
|
|
// gasprice for newly created transaction.
|
|
func NewOracle(backend OracleBackend, params Config) *Oracle {
|
|
blocks := params.Blocks
|
|
if blocks < 1 {
|
|
blocks = 1
|
|
log.Warn("Sanitizing invalid gasprice oracle sample blocks", "provided", params.Blocks, "updated", blocks)
|
|
}
|
|
percent := params.Percentile
|
|
if percent < 0 {
|
|
percent = 0
|
|
log.Warn("Sanitizing invalid gasprice oracle sample percentile", "provided", params.Percentile, "updated", percent)
|
|
} else if percent > 100 {
|
|
percent = 100
|
|
log.Warn("Sanitizing invalid gasprice oracle sample percentile", "provided", params.Percentile, "updated", percent)
|
|
}
|
|
maxPrice := params.MaxPrice
|
|
if maxPrice == nil || maxPrice.Int64() <= 0 {
|
|
maxPrice = DefaultMaxPrice
|
|
log.Warn("Sanitizing invalid gasprice oracle price cap", "provided", params.MaxPrice, "updated", maxPrice)
|
|
}
|
|
ignorePrice := params.IgnorePrice
|
|
if ignorePrice == nil || ignorePrice.Int64() <= 0 {
|
|
ignorePrice = DefaultIgnorePrice
|
|
log.Warn("Sanitizing invalid gasprice oracle ignore price", "provided", params.IgnorePrice, "updated", ignorePrice)
|
|
} else if ignorePrice.Int64() > 0 {
|
|
log.Info("Gasprice oracle is ignoring threshold set", "threshold", ignorePrice)
|
|
}
|
|
maxHeaderHistory := params.MaxHeaderHistory
|
|
if maxHeaderHistory < 1 {
|
|
maxHeaderHistory = 1
|
|
log.Warn("Sanitizing invalid gasprice oracle max header history", "provided", params.MaxHeaderHistory, "updated", maxHeaderHistory)
|
|
}
|
|
maxBlockHistory := params.MaxBlockHistory
|
|
if maxBlockHistory < 1 {
|
|
maxBlockHistory = 1
|
|
log.Warn("Sanitizing invalid gasprice oracle max block history", "provided", params.MaxBlockHistory, "updated", maxBlockHistory)
|
|
}
|
|
|
|
cache := lru.NewCache[cacheKey, processedFees](2048)
|
|
headEvent := make(chan core.ChainHeadEvent, 1)
|
|
backend.SubscribeChainHeadEvent(headEvent)
|
|
go func() {
|
|
var lastHead common.Hash
|
|
for ev := range headEvent {
|
|
if ev.Block.ParentHash() != lastHead {
|
|
cache.Purge()
|
|
}
|
|
lastHead = ev.Block.Hash()
|
|
}
|
|
}()
|
|
|
|
return &Oracle{
|
|
backend: backend,
|
|
lastPrice: params.Default,
|
|
maxPrice: maxPrice,
|
|
ignorePrice: ignorePrice,
|
|
checkBlocks: blocks,
|
|
percentile: percent,
|
|
maxHeaderHistory: maxHeaderHistory,
|
|
maxBlockHistory: maxBlockHistory,
|
|
historyCache: cache,
|
|
}
|
|
}
|
|
|
|
// SuggestTipCap returns a tip cap so that newly created transaction can have a
|
|
// very high chance to be included in the following blocks.
|
|
//
|
|
// Note, for legacy transactions and the legacy eth_gasPrice RPC call, it will be
|
|
// necessary to add the basefee to the returned number to fall back to the legacy
|
|
// behavior.
|
|
func (oracle *Oracle) SuggestTipCap(ctx context.Context) (*big.Int, error) {
|
|
head, _ := oracle.backend.HeaderByNumber(ctx, rpc.LatestBlockNumber)
|
|
headHash := head.Hash()
|
|
|
|
// If the latest gasprice is still available, return it.
|
|
oracle.cacheLock.RLock()
|
|
lastHead, lastPrice := oracle.lastHead, oracle.lastPrice
|
|
oracle.cacheLock.RUnlock()
|
|
if headHash == lastHead {
|
|
return new(big.Int).Set(lastPrice), nil
|
|
}
|
|
oracle.fetchLock.Lock()
|
|
defer oracle.fetchLock.Unlock()
|
|
|
|
// Try checking the cache again, maybe the last fetch fetched what we need
|
|
oracle.cacheLock.RLock()
|
|
lastHead, lastPrice = oracle.lastHead, oracle.lastPrice
|
|
oracle.cacheLock.RUnlock()
|
|
if headHash == lastHead {
|
|
return new(big.Int).Set(lastPrice), nil
|
|
}
|
|
var (
|
|
sent, exp int
|
|
number = head.Number.Uint64()
|
|
result = make(chan results, oracle.checkBlocks)
|
|
quit = make(chan struct{})
|
|
results []*big.Int
|
|
)
|
|
for sent < oracle.checkBlocks && number > 0 {
|
|
go oracle.getBlockValues(ctx, number, sampleNumber, oracle.ignorePrice, result, quit)
|
|
sent++
|
|
exp++
|
|
number--
|
|
}
|
|
for exp > 0 {
|
|
res := <-result
|
|
if res.err != nil {
|
|
close(quit)
|
|
return new(big.Int).Set(lastPrice), res.err
|
|
}
|
|
exp--
|
|
// Nothing returned. There are two special cases here:
|
|
// - The block is empty
|
|
// - All the transactions included are sent by the miner itself.
|
|
// In these cases, use the latest calculated price for sampling.
|
|
if len(res.values) == 0 {
|
|
res.values = []*big.Int{lastPrice}
|
|
}
|
|
// Besides, in order to collect enough data for sampling, if nothing
|
|
// meaningful returned, try to query more blocks. But the maximum
|
|
// is 2*checkBlocks.
|
|
if len(res.values) == 1 && len(results)+1+exp < oracle.checkBlocks*2 && number > 0 {
|
|
go oracle.getBlockValues(ctx, number, sampleNumber, oracle.ignorePrice, result, quit)
|
|
sent++
|
|
exp++
|
|
number--
|
|
}
|
|
results = append(results, res.values...)
|
|
}
|
|
price := lastPrice
|
|
if len(results) > 0 {
|
|
slices.SortFunc(results, func(a, b *big.Int) int { return a.Cmp(b) })
|
|
price = results[(len(results)-1)*oracle.percentile/100]
|
|
}
|
|
if price.Cmp(oracle.maxPrice) > 0 {
|
|
price = new(big.Int).Set(oracle.maxPrice)
|
|
}
|
|
oracle.cacheLock.Lock()
|
|
oracle.lastHead = headHash
|
|
oracle.lastPrice = price
|
|
oracle.cacheLock.Unlock()
|
|
|
|
return new(big.Int).Set(price), nil
|
|
}
|
|
|
|
type results struct {
|
|
values []*big.Int
|
|
err error
|
|
}
|
|
|
|
// getBlockValues calculates the lowest transaction gas price in a given block
|
|
// and sends it to the result channel. If the block is empty or all transactions
|
|
// are sent by the miner itself(it doesn't make any sense to include this kind of
|
|
// transaction prices for sampling), nil gasprice is returned.
|
|
func (oracle *Oracle) getBlockValues(ctx context.Context, blockNum uint64, limit int, ignoreUnder *big.Int, result chan results, quit chan struct{}) {
|
|
block, err := oracle.backend.BlockByNumber(ctx, rpc.BlockNumber(blockNum))
|
|
if block == nil {
|
|
select {
|
|
case result <- results{nil, err}:
|
|
case <-quit:
|
|
}
|
|
return
|
|
}
|
|
signer := types.MakeSigner(oracle.backend.ChainConfig(), block.Number(), block.Time())
|
|
|
|
// Sort the transaction by effective tip in ascending sort.
|
|
txs := block.Transactions()
|
|
sortedTxs := make([]*types.Transaction, len(txs))
|
|
copy(sortedTxs, txs)
|
|
baseFee := block.BaseFee()
|
|
slices.SortFunc(sortedTxs, func(a, b *types.Transaction) int {
|
|
// It's okay to discard the error because a tx would never be
|
|
// accepted into a block with an invalid effective tip.
|
|
tip1, _ := a.EffectiveGasTip(baseFee)
|
|
tip2, _ := b.EffectiveGasTip(baseFee)
|
|
return tip1.Cmp(tip2)
|
|
})
|
|
|
|
var prices []*big.Int
|
|
for _, tx := range sortedTxs {
|
|
tip, _ := tx.EffectiveGasTip(baseFee)
|
|
if ignoreUnder != nil && tip.Cmp(ignoreUnder) == -1 {
|
|
continue
|
|
}
|
|
sender, err := types.Sender(signer, tx)
|
|
if err == nil && sender != block.Coinbase() {
|
|
prices = append(prices, tip)
|
|
if len(prices) >= limit {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
select {
|
|
case result <- results{prices, nil}:
|
|
case <-quit:
|
|
}
|
|
}
|