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gasprice.go
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gasprice.go
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// 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 (
"fmt"
"math/big"
"sync"
"time"
"github.com/corex-mn/corex-base/inter/idx"
"github.com/corex-mn/go-corex/opera"
"github.com/corex-mn/go-corex/utils/piecefunc"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/params"
)
var DefaultMaxPrice = big.NewInt(1000000 * params.GWei)
var secondBn = big.NewInt(int64(time.Second))
const DecimalUnit = piecefunc.DecimalUnit
var DecimalUnitBn = big.NewInt(DecimalUnit)
type Config struct {
MaxPrice *big.Int `toml:",omitempty"`
MinPrice *big.Int `toml:",omitempty"`
MaxPriceMultiplierRatio *big.Int `toml:",omitempty"`
MiddlePriceMultiplierRatio *big.Int `toml:",omitempty"`
GasPowerWallRatio *big.Int `toml:",omitempty"`
}
type Reader interface {
GetLatestBlockIndex() idx.Block
TotalGasPowerLeft() uint64
GetRules() opera.Rules
GetPendingRules() opera.Rules
}
// Oracle recommends gas prices based on the content of recent
// blocks. Suitable for both light and full clients.
type Oracle struct {
backend Reader
lastHead idx.Block
lastPrice *big.Int
cfg Config
cacheLock sync.RWMutex
}
func sanitizeBigInt(val, min, max, _default *big.Int, name string) *big.Int {
if val == nil || val.Sign() == 0 {
log.Warn(fmt.Sprintf("Sanitizing invalid parameter %s of gasprice oracle", name), "provided", val, "updated", _default)
return _default
}
if min != nil && val.Cmp(min) < 0 {
log.Warn(fmt.Sprintf("Sanitizing invalid parameter %s of gasprice oracle", name), "provided", val, "updated", min)
return min
}
if max != nil && val.Cmp(max) > 0 {
log.Warn(fmt.Sprintf("Sanitizing invalid parameter %s of gasprice oracle", name), "provided", val, "updated", max)
return max
}
return val
}
// NewOracle returns a new gasprice oracle which can recommend suitable
// gasprice for newly created transaction.
func NewOracle(backend Reader, params Config) *Oracle {
params.MaxPrice = sanitizeBigInt(params.MaxPrice, nil, nil, DefaultMaxPrice, "MaxPrice")
params.MinPrice = sanitizeBigInt(params.MinPrice, nil, nil, new(big.Int), "MinPrice")
params.GasPowerWallRatio = sanitizeBigInt(params.GasPowerWallRatio, big.NewInt(1), big.NewInt(DecimalUnit-2), big.NewInt(1), "GasPowerWallRatio")
params.MaxPriceMultiplierRatio = sanitizeBigInt(params.MaxPriceMultiplierRatio, DecimalUnitBn, nil, big.NewInt(10*DecimalUnit), "MaxPriceMultiplierRatio")
params.MiddlePriceMultiplierRatio = sanitizeBigInt(params.MiddlePriceMultiplierRatio, DecimalUnitBn, params.MaxPriceMultiplierRatio, big.NewInt(2*DecimalUnit), "MiddlePriceMultiplierRatio")
return &Oracle{
backend: backend,
cfg: params,
}
}
func (gpo *Oracle) minGasPrice() *big.Int {
minPrice := gpo.backend.GetRules().Economy.MinGasPrice
pendingMinPrice := gpo.backend.GetPendingRules().Economy.MinGasPrice
if minPrice.Cmp(pendingMinPrice) < 0 {
minPrice = pendingMinPrice
}
if minPrice.Cmp(gpo.cfg.MinPrice) < 0 {
minPrice = gpo.cfg.MinPrice
}
return new(big.Int).Set(minPrice)
}
func (gpo *Oracle) maxTotalGasPower() *big.Int {
rules := gpo.backend.GetRules()
allocBn := new(big.Int).SetUint64(rules.Economy.LongGasPower.AllocPerSec)
periodBn := new(big.Int).SetUint64(uint64(rules.Economy.LongGasPower.MaxAllocPeriod))
maxTotalGasPowerBn := new(big.Int).Mul(allocBn, periodBn)
maxTotalGasPowerBn.Div(maxTotalGasPowerBn, secondBn)
return maxTotalGasPowerBn
}
func (gpo *Oracle) suggestPrice() *big.Int {
max := gpo.maxTotalGasPower()
current := new(big.Int).SetUint64(gpo.backend.TotalGasPowerLeft())
freeRatioBn := current.Mul(current, DecimalUnitBn)
freeRatioBn.Div(freeRatioBn, max)
freeRatio := freeRatioBn.Uint64()
if freeRatio > DecimalUnit {
freeRatio = DecimalUnit
}
multiplierFn := piecefunc.NewFunc([]piecefunc.Dot{
{
X: 0,
Y: gpo.cfg.MaxPriceMultiplierRatio.Uint64(),
},
{
X: gpo.cfg.GasPowerWallRatio.Uint64(),
Y: gpo.cfg.MaxPriceMultiplierRatio.Uint64(),
},
{
X: gpo.cfg.GasPowerWallRatio.Uint64() + (DecimalUnit-gpo.cfg.GasPowerWallRatio.Uint64())/2,
Y: gpo.cfg.MiddlePriceMultiplierRatio.Uint64(),
},
{
X: DecimalUnit,
Y: DecimalUnit,
},
})
multiplier := new(big.Int).SetUint64(multiplierFn(freeRatio))
// price = multiplier * min gas price
price := multiplier.Mul(multiplier, gpo.minGasPrice())
price.Div(price, DecimalUnitBn)
return price
}
// SuggestPrice returns a gasprice so that newly created transaction can
// have a very high chance to be included in the following blocks.
func (gpo *Oracle) SuggestPrice() *big.Int {
head := gpo.backend.GetLatestBlockIndex()
// If the latest gasprice is still available, return it.
gpo.cacheLock.RLock()
lastHead, lastPrice := gpo.lastHead, gpo.lastPrice
gpo.cacheLock.RUnlock()
if head == lastHead {
return lastPrice
}
price := gpo.suggestPrice()
if price.Cmp(gpo.cfg.MaxPrice) > 0 {
price = new(big.Int).Set(gpo.cfg.MaxPrice)
}
minimum := gpo.minGasPrice()
if price.Cmp(minimum) < 0 {
price = minimum
}
gpo.cacheLock.Lock()
gpo.lastHead = head
gpo.lastPrice = price
gpo.cacheLock.Unlock()
return price
}