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eth/gasprice: set default percentile to 60%, count blocks instead of transactions (#15828) 

The first should address a long term issue where we recommend a gas
price that is greater than that required for 50% of transactions in
recent blocks, which can lead to gas price inflation as people take
this figure and add a margin to it, resulting in a positive feedback
loop.
This commit is contained in:
Nick Johnson 2018-01-10 12:57:36 +00:00 committed by Felix Lange
parent 3a5a5599dd
commit b06e20bc7c
2 changed files with 34 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
eth/config.go
View File

@ -49,8 +49,8 @@ var DefaultConfig = Config{
TxPool: core.DefaultTxPoolConfig,
GPO: gasprice.Config{
Blocks: 10,
Percentile: 50,
Blocks: 20,
Percentile: 60,
},
}

47
eth/gasprice/gasprice.go
View File

@ -23,6 +23,7 @@ import (
"sync"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rpc"
@ -101,9 +102,9 @@ func (gpo *Oracle) SuggestPrice(ctx context.Context) (*big.Int, error) {
ch := make(chan getBlockPricesResult, gpo.checkBlocks)
sent := 0
exp := 0
var txPrices []*big.Int
var blockPrices []*big.Int
for sent < gpo.checkBlocks && blockNum > 0 {
go gpo.getBlockPrices(ctx, blockNum, ch)
go gpo.getBlockPrices(ctx, types.MakeSigner(gpo.backend.ChainConfig(), big.NewInt(int64(blockNum))), blockNum, ch)
sent++
exp++
blockNum--
@ -115,8 +116,8 @@ func (gpo *Oracle) SuggestPrice(ctx context.Context) (*big.Int, error) {
return lastPrice, res.err
}
exp--
if len(res.prices) > 0 {
txPrices = append(txPrices, res.prices...)
if res.price != nil {
blockPrices = append(blockPrices, res.price)
continue
}
if maxEmpty > 0 {
@ -124,16 +125,16 @@ func (gpo *Oracle) SuggestPrice(ctx context.Context) (*big.Int, error) {
continue
}
if blockNum > 0 && sent < gpo.maxBlocks {
go gpo.getBlockPrices(ctx, blockNum, ch)
go gpo.getBlockPrices(ctx, types.MakeSigner(gpo.backend.ChainConfig(), big.NewInt(int64(blockNum))), blockNum, ch)
sent++
exp++
blockNum--
}
}
price := lastPrice
if len(txPrices) > 0 {
sort.Sort(bigIntArray(txPrices))
price = txPrices[(len(txPrices)-1)*gpo.percentile/100]
if len(blockPrices) > 0 {
sort.Sort(bigIntArray(blockPrices))
price = blockPrices[(len(blockPrices)-1)*gpo.percentile/100]
}
if price.Cmp(maxPrice) > 0 {
price = new(big.Int).Set(maxPrice)
@ -147,24 +148,38 @@ func (gpo *Oracle) SuggestPrice(ctx context.Context) (*big.Int, error) {
}
type getBlockPricesResult struct {
prices []*big.Int
price *big.Int
err error
}
// getLowestPrice calculates the lowest transaction gas price in a given block
type transactionsByGasPrice []*types.Transaction
func (t transactionsByGasPrice) Len() int { return len(t) }
func (t transactionsByGasPrice) Swap(i, j int) { t[i], t[j] = t[j], t[i] }
func (t transactionsByGasPrice) Less(i, j int) bool { return t[i].GasPrice().Cmp(t[j].GasPrice()) < 0 }
// getBlockPrices 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 (gpo *Oracle) getBlockPrices(ctx context.Context, blockNum uint64, ch chan getBlockPricesResult) {
func (gpo *Oracle) getBlockPrices(ctx context.Context, signer types.Signer, blockNum uint64, ch chan getBlockPricesResult) {
block, err := gpo.backend.BlockByNumber(ctx, rpc.BlockNumber(blockNum))
if block == nil {
ch <- getBlockPricesResult{nil, err}
return
}
txs := block.Transactions()
prices := make([]*big.Int, len(txs))
for i, tx := range txs {
prices[i] = tx.GasPrice()
blockTxs := block.Transactions()
txs := make([]*types.Transaction, len(blockTxs))
copy(txs, blockTxs)
sort.Sort(transactionsByGasPrice(txs))
for _, tx := range txs {
sender, err := types.Sender(signer, tx)
if err == nil && sender != block.Coinbase() {
ch <- getBlockPricesResult{tx.GasPrice(), nil}
return
}
ch <- getBlockPricesResult{prices, nil}
}
ch <- getBlockPricesResult{nil, nil}
}
type bigIntArray []*big.Int