2015-07-06 17:54:22 -07:00
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// Copyright 2015 The go-ethereum Authors
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// This file is part of go-ethereum.
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//
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// go-ethereum is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// go-ethereum is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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2015-05-26 05:28:32 -07:00
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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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2015-06-29 04:48:10 -07:00
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last := int64(-1)
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cblock := self.chain.CurrentBlock()
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if cblock != nil {
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last = int64(cblock.NumberU64())
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}
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first := int64(0)
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2015-05-26 05:28:32 -07:00
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if last > gpoProcessPastBlocks {
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first = last - gpoProcessPastBlocks
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}
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2015-06-29 04:48:10 -07:00
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self.firstProcessed = uint64(first)
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2015-05-26 05:28:32 -07:00
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for i := first; i <= last; i++ {
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2015-06-29 04:48:10 -07:00
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block := self.chain.GetBlockByNumber(uint64(i))
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if block != nil {
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self.processBlock(block)
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}
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2015-05-26 05:28:32 -07:00
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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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2015-07-03 17:25:04 -07:00
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receipts := self.eth.BlockProcessor().GetBlockReceipts(block.Hash())
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if len(receipts) > 0 {
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2015-07-06 11:59:12 -07:00
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if cgu := receipts[len(receipts)-1].CumulativeGasUsed; cgu != nil {
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gasUsed = receipts[len(receipts)-1].CumulativeGasUsed
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}
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2015-05-26 05:28:32 -07:00
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}
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2015-06-26 18:08:50 -07:00
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if new(big.Int).Mul(gasUsed, big.NewInt(100)).Cmp(new(big.Int).Mul(block.GasLimit(),
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2015-05-26 05:28:32 -07:00
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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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2015-06-26 18:08:50 -07:00
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txs := block.Transactions()
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if len(txs) == 0 {
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2015-05-26 05:28:32 -07:00
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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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2015-06-26 18:08:50 -07:00
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minPrice := txs[0].GasPrice()
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for i := 1; i < len(txs); i++ {
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price := txs[i].GasPrice()
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2015-05-26 05:28:32 -07:00
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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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2015-05-26 05:39:13 -07:00
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if base == nil {
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base = self.eth.GpoMinGasPrice
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}
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2015-05-26 06:15:54 -07:00
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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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2015-05-26 05:39:13 -07:00
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2015-05-27 03:39:59 -07:00
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baseCorr := new(big.Int).Mul(base, big.NewInt(int64(self.eth.GpobaseCorrectionFactor)))
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2015-05-26 05:28:32 -07:00
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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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