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Diffstat (limited to 'eth/gasprice/lightprice.go')
| -rw-r--r-- | eth/gasprice/lightprice.go | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/eth/gasprice/lightprice.go b/eth/gasprice/lightprice.go deleted file mode 100644 index 562c7dd97..000000000 --- a/eth/gasprice/lightprice.go +++ /dev/null @@ -1,160 +0,0 @@ -// Copyright 2016 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" - "sort" - "sync" - - "github.com/ethereum/go-ethereum/common" - "github.com/ethereum/go-ethereum/internal/ethapi" - "github.com/ethereum/go-ethereum/rpc" -) - -const ( - LpoAvgCount = 5 - LpoMinCount = 3 - LpoMaxBlocks = 20 - LpoSelect = 50 - LpoDefaultPrice = 20000000000 -) - -// LightPriceOracle recommends gas prices based on the content of recent -// blocks. Suitable for both light and full clients. -type LightPriceOracle struct { - backend ethapi.Backend - lastHead common.Hash - lastPrice *big.Int - cacheLock sync.RWMutex - fetchLock sync.Mutex -} - -// NewLightPriceOracle returns a new oracle. -func NewLightPriceOracle(backend ethapi.Backend) *LightPriceOracle { - return &LightPriceOracle{ - backend: backend, - lastPrice: big.NewInt(LpoDefaultPrice), - } -} - -// SuggestPrice returns the recommended gas price. -func (self *LightPriceOracle) SuggestPrice(ctx context.Context) (*big.Int, error) { - self.cacheLock.RLock() - lastHead := self.lastHead - lastPrice := self.lastPrice - self.cacheLock.RUnlock() - - head, _ := self.backend.HeaderByNumber(ctx, rpc.LatestBlockNumber) - headHash := head.Hash() - if headHash == lastHead { - return lastPrice, nil - } - - self.fetchLock.Lock() - defer self.fetchLock.Unlock() - - // try checking the cache again, maybe the last fetch fetched what we need - self.cacheLock.RLock() - lastHead = self.lastHead - lastPrice = self.lastPrice - self.cacheLock.RUnlock() - if headHash == lastHead { - return lastPrice, nil - } - - blockNum := head.Number.Uint64() - chn := make(chan lpResult, LpoMaxBlocks) - sent := 0 - exp := 0 - var lps bigIntArray - for sent < LpoAvgCount && blockNum > 0 { - go self.getLowestPrice(ctx, blockNum, chn) - sent++ - exp++ - blockNum-- - } - maxEmpty := LpoAvgCount - LpoMinCount - for exp > 0 { - res := <-chn - if res.err != nil { - return nil, res.err - } - exp-- - if res.price != nil { - lps = append(lps, res.price) - } else { - if maxEmpty > 0 { - maxEmpty-- - } else { - if blockNum > 0 && sent < LpoMaxBlocks { - go self.getLowestPrice(ctx, blockNum, chn) - sent++ - exp++ - blockNum-- - } - } - } - } - price := lastPrice - if len(lps) > 0 { - sort.Sort(lps) - price = lps[(len(lps)-1)*LpoSelect/100] - } - - self.cacheLock.Lock() - self.lastHead = headHash - self.lastPrice = price - self.cacheLock.Unlock() - return price, nil -} - -type lpResult struct { - price *big.Int - err error -} - -// getLowestPrice calculates the lowest transaction gas price in a given block -// and sends it to the result channel. If the block is empty, price is nil. -func (self *LightPriceOracle) getLowestPrice(ctx context.Context, blockNum uint64, chn chan lpResult) { - block, err := self.backend.BlockByNumber(ctx, rpc.BlockNumber(blockNum)) - if block == nil { - chn <- lpResult{nil, err} - return - } - txs := block.Transactions() - if len(txs) == 0 { - chn <- lpResult{nil, nil} - return - } - // find smallest gasPrice - minPrice := txs[0].GasPrice() - for i := 1; i < len(txs); i++ { - price := txs[i].GasPrice() - if price.Cmp(minPrice) < 0 { - minPrice = price - } - } - chn <- lpResult{minPrice, nil} -} - -type bigIntArray []*big.Int - -func (s bigIntArray) Len() int { return len(s) } -func (s bigIntArray) Less(i, j int) bool { return s[i].Cmp(s[j]) < 0 } -func (s bigIntArray) Swap(i, j int) { s[i], s[j] = s[j], s[i] } |