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-rw-r--r--eth/gasprice/gasprice.go145
1 files changed, 88 insertions, 57 deletions
diff --git a/eth/gasprice/gasprice.go b/eth/gasprice/gasprice.go
index 23e49a6..14f50b1 100644
--- a/eth/gasprice/gasprice.go
+++ b/eth/gasprice/gasprice.go
@@ -23,123 +23,144 @@ import (
"sync"
"github.com/ava-labs/coreth/core/types"
- "github.com/ava-labs/coreth/internal/ethapi"
"github.com/ava-labs/coreth/params"
"github.com/ava-labs/coreth/rpc"
- "github.com/ava-labs/go-ethereum/common"
+ "github.com/ethereum/go-ethereum/common"
+ "github.com/ethereum/go-ethereum/log"
)
-var maxPrice = big.NewInt(500 * params.GWei)
+const sampleNumber = 3 // Number of transactions sampled in a block
+
+var DefaultMaxPrice = big.NewInt(500 * params.GWei)
type Config struct {
Blocks int
Percentile int
Default *big.Int `toml:",omitempty"`
+ MaxPrice *big.Int `toml:",omitempty"`
+}
+
+// OracleBackend includes all necessary background APIs for oracle.
+type OracleBackend interface {
+ HeaderByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Header, error)
+ BlockByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Block, error)
+ ChainConfig() *params.ChainConfig
}
// Oracle recommends gas prices based on the content of recent
// blocks. Suitable for both light and full clients.
type Oracle struct {
- backend ethapi.Backend
+ backend OracleBackend
lastHead common.Hash
lastPrice *big.Int
+ maxPrice *big.Int
cacheLock sync.RWMutex
fetchLock sync.Mutex
- checkBlocks, maxEmpty, maxBlocks int
- percentile int
+ checkBlocks int
+ percentile int
}
-// NewOracle returns a new oracle.
-func NewOracle(backend ethapi.Backend, params Config) *Oracle {
+// NewOracle returns a new gasprice oracle which can recommend suitable
+// gasprice for newly created transaction.
+func NewOracle(backend OracleBackend, params Config) *Oracle {
blocks := params.Blocks
if blocks < 1 {
blocks = 1
+ log.Warn("Sanitizing invalid gasprice oracle sample blocks", "provided", params.Blocks, "updated", blocks)
}
percent := params.Percentile
if percent < 0 {
percent = 0
+ log.Warn("Sanitizing invalid gasprice oracle sample percentile", "provided", params.Percentile, "updated", percent)
}
if percent > 100 {
percent = 100
+ log.Warn("Sanitizing invalid gasprice oracle sample percentile", "provided", params.Percentile, "updated", percent)
+ }
+ maxPrice := params.MaxPrice
+ if maxPrice == nil || maxPrice.Int64() <= 0 {
+ maxPrice = DefaultMaxPrice
+ log.Warn("Sanitizing invalid gasprice oracle price cap", "provided", params.MaxPrice, "updated", maxPrice)
}
return &Oracle{
backend: backend,
lastPrice: params.Default,
+ maxPrice: maxPrice,
checkBlocks: blocks,
- maxEmpty: blocks / 2,
- maxBlocks: blocks * 5,
percentile: percent,
}
}
-// SuggestPrice returns the recommended gas 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(ctx context.Context) (*big.Int, error) {
- gpo.cacheLock.RLock()
- lastHead := gpo.lastHead
- lastPrice := gpo.lastPrice
- gpo.cacheLock.RUnlock()
-
head, _ := gpo.backend.HeaderByNumber(ctx, rpc.LatestBlockNumber)
headHash := head.Hash()
+
+ // If the latest gasprice is still available, return it.
+ gpo.cacheLock.RLock()
+ lastHead, lastPrice := gpo.lastHead, gpo.lastPrice
+ gpo.cacheLock.RUnlock()
if headHash == lastHead {
return lastPrice, nil
}
-
gpo.fetchLock.Lock()
defer gpo.fetchLock.Unlock()
- // try checking the cache again, maybe the last fetch fetched what we need
+ // Try checking the cache again, maybe the last fetch fetched what we need
gpo.cacheLock.RLock()
- lastHead = gpo.lastHead
- lastPrice = gpo.lastPrice
+ lastHead, lastPrice = gpo.lastHead, gpo.lastPrice
gpo.cacheLock.RUnlock()
if headHash == lastHead {
return lastPrice, nil
}
-
- blockNum := head.Number.Uint64()
- ch := make(chan getBlockPricesResult, gpo.checkBlocks)
- sent := 0
- exp := 0
- var blockPrices []*big.Int
- for sent < gpo.checkBlocks && blockNum > 0 {
- go gpo.getBlockPrices(ctx, types.MakeSigner(gpo.backend.ChainConfig(), big.NewInt(int64(blockNum))), blockNum, ch)
+ var (
+ sent, exp int
+ number = head.Number.Uint64()
+ result = make(chan getBlockPricesResult, gpo.checkBlocks)
+ quit = make(chan struct{})
+ txPrices []*big.Int
+ )
+ for sent < gpo.checkBlocks && number > 0 {
+ go gpo.getBlockPrices(ctx, types.MakeSigner(gpo.backend.ChainConfig(), big.NewInt(int64(number))), number, sampleNumber, result, quit)
sent++
exp++
- blockNum--
+ number--
}
- maxEmpty := gpo.maxEmpty
for exp > 0 {
- res := <-ch
+ res := <-result
if res.err != nil {
+ close(quit)
return lastPrice, res.err
}
exp--
- if res.price != nil {
- blockPrices = append(blockPrices, res.price)
- continue
- }
- if maxEmpty > 0 {
- maxEmpty--
- continue
+ // Nothing returned. There are two special cases here:
+ // - The block is empty
+ // - All the transactions included are sent by the miner itself.
+ // In these cases, use the latest calculated price for samping.
+ if len(res.prices) == 0 {
+ res.prices = []*big.Int{lastPrice}
}
- if blockNum > 0 && sent < gpo.maxBlocks {
- go gpo.getBlockPrices(ctx, types.MakeSigner(gpo.backend.ChainConfig(), big.NewInt(int64(blockNum))), blockNum, ch)
+ // Besides, in order to collect enough data for sampling, if nothing
+ // meaningful returned, try to query more blocks. But the maximum
+ // is 2*checkBlocks.
+ if len(res.prices) == 1 && len(txPrices)+1+exp < gpo.checkBlocks*2 && number > 0 {
+ go gpo.getBlockPrices(ctx, types.MakeSigner(gpo.backend.ChainConfig(), big.NewInt(int64(number))), number, sampleNumber, result, quit)
sent++
exp++
- blockNum--
+ number--
}
+ txPrices = append(txPrices, res.prices...)
}
price := lastPrice
- if len(blockPrices) > 0 {
- sort.Sort(bigIntArray(blockPrices))
- price = blockPrices[(len(blockPrices)-1)*gpo.percentile/100]
+ if len(txPrices) > 0 {
+ sort.Sort(bigIntArray(txPrices))
+ price = txPrices[(len(txPrices)-1)*gpo.percentile/100]
}
- if price.Cmp(maxPrice) > 0 {
- price = new(big.Int).Set(maxPrice)
+ if price.Cmp(gpo.maxPrice) > 0 {
+ price = new(big.Int).Set(gpo.maxPrice)
}
-
gpo.cacheLock.Lock()
gpo.lastHead = headHash
gpo.lastPrice = price
@@ -148,38 +169,48 @@ func (gpo *Oracle) SuggestPrice(ctx context.Context) (*big.Int, error) {
}
type getBlockPricesResult struct {
- price *big.Int
- err error
+ prices []*big.Int
+ err error
}
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 }
+func (t transactionsByGasPrice) Less(i, j int) bool { return t[i].GasPriceCmp(t[j]) < 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, signer types.Signer, blockNum uint64, ch chan getBlockPricesResult) {
+// and sends it to the result channel. If the block is empty or all transactions
+// are sent by the miner itself(it doesn't make any sense to include this kind of
+// transaction prices for sampling), nil gasprice is returned.
+func (gpo *Oracle) getBlockPrices(ctx context.Context, signer types.Signer, blockNum uint64, limit int, result chan getBlockPricesResult, quit chan struct{}) {
block, err := gpo.backend.BlockByNumber(ctx, rpc.BlockNumber(blockNum))
if block == nil {
- ch <- getBlockPricesResult{nil, err}
+ select {
+ case result <- getBlockPricesResult{nil, err}:
+ case <-quit:
+ }
return
}
-
blockTxs := block.Transactions()
txs := make([]*types.Transaction, len(blockTxs))
copy(txs, blockTxs)
sort.Sort(transactionsByGasPrice(txs))
+ var prices []*big.Int
for _, tx := range txs {
sender, err := types.Sender(signer, tx)
if err == nil && sender != block.Coinbase() {
- ch <- getBlockPricesResult{tx.GasPrice(), nil}
- return
+ prices = append(prices, tx.GasPrice())
+ if len(prices) >= limit {
+ break
+ }
}
}
- ch <- getBlockPricesResult{nil, nil}
+ select {
+ case result <- getBlockPricesResult{prices, nil}:
+ case <-quit:
+ }
}
type bigIntArray []*big.Int
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