182 lines
4.3 KiB
Go
182 lines
4.3 KiB
Go
package eth
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import (
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"math/big"
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"math/rand"
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"sync"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/event"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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)
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const gpoProcessPastBlocks = 100
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type blockPriceInfo struct {
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baseGasPrice *big.Int
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}
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type GasPriceOracle struct {
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eth *Ethereum
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chain *core.ChainManager
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pool *core.TxPool
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events event.Subscription
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blocks map[uint64]*blockPriceInfo
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firstProcessed, lastProcessed uint64
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lastBaseMutex sync.Mutex
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lastBase *big.Int
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}
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func NewGasPriceOracle(eth *Ethereum) (self *GasPriceOracle) {
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self = &GasPriceOracle{}
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self.blocks = make(map[uint64]*blockPriceInfo)
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self.eth = eth
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self.chain = eth.chainManager
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self.pool = eth.txPool
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self.events = eth.EventMux().Subscribe(
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core.ChainEvent{},
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core.ChainSplitEvent{},
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core.TxPreEvent{},
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core.TxPostEvent{},
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)
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self.processPastBlocks()
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go self.listenLoop()
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return
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}
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func (self *GasPriceOracle) processPastBlocks() {
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last := self.chain.CurrentBlock().NumberU64()
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first := uint64(0)
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if last > gpoProcessPastBlocks {
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first = last - gpoProcessPastBlocks
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}
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self.firstProcessed = first
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for i := first; i <= last; i++ {
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self.processBlock(self.chain.GetBlockByNumber(i))
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}
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}
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func (self *GasPriceOracle) listenLoop() {
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for {
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ev, isopen := <-self.events.Chan()
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if !isopen {
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break
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}
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switch ev := ev.(type) {
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case core.ChainEvent:
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self.processBlock(ev.Block)
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case core.ChainSplitEvent:
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self.processBlock(ev.Block)
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case core.TxPreEvent:
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case core.TxPostEvent:
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}
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}
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self.events.Unsubscribe()
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}
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func (self *GasPriceOracle) processBlock(block *types.Block) {
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i := block.NumberU64()
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if i > self.lastProcessed {
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self.lastProcessed = i
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}
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lastBase := self.eth.GpoMinGasPrice
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bpl := self.blocks[i-1]
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if bpl != nil {
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lastBase = bpl.baseGasPrice
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}
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if lastBase == nil {
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return
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}
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var corr int
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lp := self.lowestPrice(block)
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if lp == nil {
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return
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}
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if lastBase.Cmp(lp) < 0 {
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corr = self.eth.GpobaseStepUp
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} else {
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corr = -self.eth.GpobaseStepDown
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}
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crand := int64(corr * (900 + rand.Intn(201)))
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newBase := new(big.Int).Mul(lastBase, big.NewInt(1000000+crand))
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newBase.Div(newBase, big.NewInt(1000000))
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bpi := self.blocks[i]
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if bpi == nil {
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bpi = &blockPriceInfo{}
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self.blocks[i] = bpi
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}
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bpi.baseGasPrice = newBase
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self.lastBaseMutex.Lock()
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self.lastBase = newBase
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self.lastBaseMutex.Unlock()
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glog.V(logger.Detail).Infof("Processed block #%v, base price is %v\n", block.NumberU64(), newBase.Int64())
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}
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// returns the lowers possible price with which a tx was or could have been included
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func (self *GasPriceOracle) lowestPrice(block *types.Block) *big.Int {
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gasUsed := new(big.Int)
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recepits, err := self.eth.BlockProcessor().GetBlockReceipts(block.Hash())
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if err != nil {
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return self.eth.GpoMinGasPrice
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}
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if len(recepits) > 0 {
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gasUsed = recepits[len(recepits)-1].CumulativeGasUsed
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}
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if new(big.Int).Mul(gasUsed, big.NewInt(100)).Cmp(new(big.Int).Mul(block.Header().GasLimit,
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big.NewInt(int64(self.eth.GpoFullBlockRatio)))) < 0 {
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// block is not full, could have posted a tx with MinGasPrice
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return self.eth.GpoMinGasPrice
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}
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if len(block.Transactions()) < 1 {
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return self.eth.GpoMinGasPrice
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}
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// block is full, find smallest gasPrice
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minPrice := block.Transactions()[0].GasPrice()
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for i := 1; i < len(block.Transactions()); i++ {
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price := block.Transactions()[i].GasPrice()
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if price.Cmp(minPrice) < 0 {
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minPrice = price
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}
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}
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return minPrice
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}
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func (self *GasPriceOracle) SuggestPrice() *big.Int {
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self.lastBaseMutex.Lock()
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base := self.lastBase
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self.lastBaseMutex.Unlock()
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if base == nil {
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base = self.eth.GpoMinGasPrice
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}
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if base == nil {
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return big.NewInt(10000000000000) // apparently MinGasPrice is not initialized during some tests
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}
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baseCorr := new(big.Int).Mul(base, big.NewInt(int64(100+self.eth.GpobaseCorrectionFactor)))
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baseCorr.Div(baseCorr, big.NewInt(100))
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if baseCorr.Cmp(self.eth.GpoMinGasPrice) < 0 {
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return self.eth.GpoMinGasPrice
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}
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if baseCorr.Cmp(self.eth.GpoMaxGasPrice) > 0 {
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return self.eth.GpoMaxGasPrice
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}
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return baseCorr
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}
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