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eth/gasprice, internal/ethapi, miner: minor feehistory fixes
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@karalabe
karalabe committed Jul 8, 2021
1 parent 5441a8f commit dea7155
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Showing 4 changed files with 108 additions and 100 deletions.
169 changes: 88 additions & 81 deletions eth/gasprice/feehistory.go
View file
Expand Up @@ -19,6 +19,7 @@ package gasprice
import (
"context"
"errors"
"fmt"
"math/big"
"sort"
"sync/atomic"
Expand All @@ -30,11 +31,19 @@ import (
)

var (
errInvalidPercentiles = errors.New("Invalid reward percentiles")
errRequestBeyondHead = errors.New("Request beyond head block")
errInvalidPercentile = errors.New("invalid reward percentile")
errRequestBeyondHead = errors.New("request beyond head block")
)

const maxBlockCount = 1024 // number of blocks retrievable with a single query
const (
// maxFeeHistory is the maximum number of blocks that can be retrieved for a
// fee history request.
maxFeeHistory = 1024

// maxBlockFetchers is the max number of goroutines to spin up to pull blocks
// for the fee history calculation (mostly relevant for LES).
maxBlockFetchers = 4
)

// blockFees represents a single block for processing
type blockFees struct {
Expand Down Expand Up @@ -124,56 +133,55 @@ func (oracle *Oracle) processBlock(bf *blockFees, percentiles []float64) {
// also returned if requested and available.
// Note: an error is only returned if retrieving the head header has failed. If there are no
// retrievable blocks in the specified range then zero block count is returned with no error.
func (oracle *Oracle) resolveBlockRange(ctx context.Context, lastBlockNumber rpc.BlockNumber, blockCount, maxHistory int) (*types.Block, types.Receipts, rpc.BlockNumber, int, error) {
func (oracle *Oracle) resolveBlockRange(ctx context.Context, lastBlock rpc.BlockNumber, blocks, maxHistory int) (*types.Block, []*types.Receipt, rpc.BlockNumber, int, error) {
var (
headBlockNumber rpc.BlockNumber
headBlock rpc.BlockNumber
pendingBlock *types.Block
pendingReceipts types.Receipts
)

// query either pending block or head header and set headBlockNumber
if lastBlockNumber == rpc.PendingBlockNumber {
// query either pending block or head header and set headBlock
if lastBlock == rpc.PendingBlockNumber {
if pendingBlock, pendingReceipts = oracle.backend.PendingBlockAndReceipts(); pendingBlock != nil {
lastBlockNumber = rpc.BlockNumber(pendingBlock.NumberU64())
headBlockNumber = lastBlockNumber - 1
lastBlock = rpc.BlockNumber(pendingBlock.NumberU64())
headBlock = lastBlock - 1
} else {
// pending block not supported by backend, process until latest block
lastBlockNumber = rpc.LatestBlockNumber
blockCount--
if blockCount == 0 {
lastBlock = rpc.LatestBlockNumber
blocks--
if blocks == 0 {
return nil, nil, 0, 0, nil
}
}
}
if pendingBlock == nil {
// if pending block is not fetched then we retrieve the head header to get the head block number
if latestHeader, err := oracle.backend.HeaderByNumber(ctx, rpc.LatestBlockNumber); err == nil {
headBlockNumber = rpc.BlockNumber(latestHeader.Number.Uint64())
headBlock = rpc.BlockNumber(latestHeader.Number.Uint64())
} else {
return nil, nil, 0, 0, err
}
}
if lastBlockNumber == rpc.LatestBlockNumber {
lastBlockNumber = headBlockNumber
} else if pendingBlock == nil && lastBlockNumber > headBlockNumber {
return nil, nil, 0, 0, errRequestBeyondHead
if lastBlock == rpc.LatestBlockNumber {
lastBlock = headBlock
} else if pendingBlock == nil && lastBlock > headBlock {
return nil, nil, 0, 0, fmt.Errorf("%w: requested %d, head %d", errRequestBeyondHead, lastBlock, headBlock)
}
if maxHistory != 0 {
// limit retrieval to the given number of latest blocks
if tooOldCount := int64(headBlockNumber) - int64(maxHistory) - int64(lastBlockNumber) + int64(blockCount); tooOldCount > 0 {
if tooOldCount := int64(headBlock) - int64(maxHistory) - int64(lastBlock) + int64(blocks); tooOldCount > 0 {
// tooOldCount is the number of requested blocks that are too old to be served
if int64(blockCount) > tooOldCount {
blockCount -= int(tooOldCount)
if int64(blocks) > tooOldCount {
blocks -= int(tooOldCount)
} else {
return nil, nil, 0, 0, nil
}
}
}
// ensure not trying to retrieve before genesis
if rpc.BlockNumber(blockCount) > lastBlockNumber+1 {
blockCount = int(lastBlockNumber + 1)
if rpc.BlockNumber(blocks) > lastBlock+1 {
blocks = int(lastBlock + 1)
}
return pendingBlock, pendingReceipts, lastBlockNumber, blockCount, nil
return pendingBlock, pendingReceipts, lastBlock, blocks, nil
}

// FeeHistory returns data relevant for fee estimation based on the specified range of blocks.
Expand All @@ -189,90 +197,89 @@ func (oracle *Oracle) resolveBlockRange(ctx context.Context, lastBlockNumber rpc
// - gasUsedRatio: gasUsed/gasLimit in the given block
// Note: baseFee includes the next block after the newest of the returned range, because this
// value can be derived from the newest block.
func (oracle *Oracle) FeeHistory(ctx context.Context, blockCount int, lastBlockNumber rpc.BlockNumber, rewardPercentiles []float64) (firstBlockNumber rpc.BlockNumber, reward [][]*big.Int, baseFee []*big.Int, gasUsedRatio []float64, err error) {
if blockCount < 1 {
// returning with no data and no error means there are no retrievable blocks
return
func (oracle *Oracle) FeeHistory(ctx context.Context, blocks int, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (rpc.BlockNumber, [][]*big.Int, []*big.Int, []float64, error) {
if blocks < 1 {
return 0, nil, nil, nil, nil // returning with no data and no error means there are no retrievable blocks
}
if blockCount > maxBlockCount {
blockCount = maxBlockCount
if blocks > maxFeeHistory {
log.Warn("Sanitizing fee history length", "requested", blocks, "truncated", maxFeeHistory)
blocks = maxFeeHistory
}
for i, p := range rewardPercentiles {
if p < 0 || p > 100 || (i > 0 && p < rewardPercentiles[i-1]) {
return 0, nil, nil, nil, errInvalidPercentiles
if p < 0 || p > 100 {
return 0, nil, nil, nil, fmt.Errorf("%w: %f", errInvalidPercentile, p)
}
if i > 0 && p < rewardPercentiles[i-1] {
return 0, nil, nil, nil, fmt.Errorf("%w: #%d:%f > #%d:%f", errInvalidPercentile, i-1, rewardPercentiles[i-1], i, p)
}
}

processBlocks := len(rewardPercentiles) != 0
// limit retrieval to maxHistory if set
var maxHistory int
if processBlocks {
// Only process blocks if reward percentiles were requested
maxHistory := oracle.maxHeaderHistory
if len(rewardPercentiles) != 0 {
maxHistory = oracle.maxBlockHistory
} else {
maxHistory = oracle.maxHeaderHistory
}

var (
pendingBlock *types.Block
pendingReceipts types.Receipts
pendingReceipts []*types.Receipt
err error
)
if pendingBlock, pendingReceipts, lastBlockNumber, blockCount, err = oracle.resolveBlockRange(ctx, lastBlockNumber, blockCount, maxHistory); err != nil || blockCount == 0 {
return
pendingBlock, pendingReceipts, lastBlock, blocks, err = oracle.resolveBlockRange(ctx, lastBlock, blocks, maxHistory)
if err != nil || blocks == 0 {
return 0, nil, nil, nil, err
}
firstBlockNumber = lastBlockNumber + 1 - rpc.BlockNumber(blockCount)
oldestBlock := lastBlock + 1 - rpc.BlockNumber(blocks)

processNext := int64(firstBlockNumber)
resultCh := make(chan *blockFees, blockCount)
threadCount := 4
if blockCount < threadCount {
threadCount = blockCount
}
for i := 0; i < threadCount; i++ {
var (
next = int64(oldestBlock)
results = make(chan *blockFees, blocks)
)
for i := 0; i < maxBlockFetchers && i < blocks; i++ {
go func() {
for {
blockNumber := rpc.BlockNumber(atomic.AddInt64(&processNext, 1) - 1)
if blockNumber > lastBlockNumber {
// Retrieve the next block number to fetch with this goroutine
blockNumber := rpc.BlockNumber(atomic.AddInt64(&next, 1) - 1)
if blockNumber > lastBlock {
return
}

bf := &blockFees{blockNumber: blockNumber}
fees := &blockFees{blockNumber: blockNumber}
if pendingBlock != nil && blockNumber >= rpc.BlockNumber(pendingBlock.NumberU64()) {
bf.block, bf.receipts = pendingBlock, pendingReceipts
fees.block, fees.receipts = pendingBlock, pendingReceipts
} else {
if processBlocks {
bf.block, bf.err = oracle.backend.BlockByNumber(ctx, blockNumber)
if bf.block != nil {
bf.receipts, bf.err = oracle.backend.GetReceipts(ctx, bf.block.Hash())
if len(rewardPercentiles) != 0 {
fees.block, fees.err = oracle.backend.BlockByNumber(ctx, blockNumber)
if fees.block != nil && fees.err == nil {
fees.receipts, fees.err = oracle.backend.GetReceipts(ctx, fees.block.Hash())
}
} else {
bf.header, bf.err = oracle.backend.HeaderByNumber(ctx, blockNumber)
fees.header, fees.err = oracle.backend.HeaderByNumber(ctx, blockNumber)
}
}
if bf.block != nil {
bf.header = bf.block.Header()
if fees.block != nil {
fees.header = fees.block.Header()
}
if bf.header != nil {
oracle.processBlock(bf, rewardPercentiles)
if fees.header != nil {
oracle.processBlock(fees, rewardPercentiles)
}
// send to resultCh even if empty to guarantee that blockCount items are sent in total
resultCh <- bf
// send to results even if empty to guarantee that blocks items are sent in total
results <- fees
}
}()
}

reward = make([][]*big.Int, blockCount)
baseFee = make([]*big.Int, blockCount+1)
gasUsedRatio = make([]float64, blockCount)
firstMissing := blockCount

for ; blockCount > 0; blockCount-- {
bf := <-resultCh
if bf.err != nil {
return 0, nil, nil, nil, bf.err
var (
reward = make([][]*big.Int, blocks)
baseFee = make([]*big.Int, blocks+1)
gasUsedRatio = make([]float64, blocks)
firstMissing = blocks
)
for ; blocks > 0; blocks-- {
fees := <-results
if fees.err != nil {
return 0, nil, nil, nil, fees.err
}
i := int(bf.blockNumber - firstBlockNumber)
if bf.header != nil {
reward[i], baseFee[i], baseFee[i+1], gasUsedRatio[i] = bf.reward, bf.baseFee, bf.nextBaseFee, bf.gasUsedRatio
i := int(fees.blockNumber - oldestBlock)
if fees.header != nil {
reward[i], baseFee[i], baseFee[i+1], gasUsedRatio[i] = fees.reward, fees.baseFee, fees.nextBaseFee, fees.gasUsedRatio
} else {
// getting no block and no error means we are requesting into the future (might happen because of a reorg)
if i < firstMissing {
Expand All @@ -283,11 +290,11 @@ func (oracle *Oracle) FeeHistory(ctx context.Context, blockCount int, lastBlockN
if firstMissing == 0 {
return 0, nil, nil, nil, nil
}
if processBlocks {
if len(rewardPercentiles) != 0 {
reward = reward[:firstMissing]
} else {
reward = nil
}
baseFee, gasUsedRatio = baseFee[:firstMissing+1], gasUsedRatio[:firstMissing]
return
return oldestBlock, reward, baseFee, gasUsedRatio, nil
}
5 changes: 3 additions & 2 deletions eth/gasprice/feehistory_test.go
View file
Expand Up @@ -18,6 +18,7 @@ package gasprice

import (
"context"
"errors"
"math/big"
"testing"

Expand All @@ -37,7 +38,7 @@ func TestFeeHistory(t *testing.T) {
}{
{false, 0, 0, 10, 30, nil, 21, 10, nil},
{false, 0, 0, 10, 30, []float64{0, 10}, 21, 10, nil},
{false, 0, 0, 10, 30, []float64{20, 10}, 0, 0, errInvalidPercentiles},
{false, 0, 0, 10, 30, []float64{20, 10}, 0, 0, errInvalidPercentile},
{false, 0, 0, 1000000000, 30, nil, 0, 31, nil},
{false, 0, 0, 1000000000, rpc.LatestBlockNumber, nil, 0, 33, nil},
{false, 0, 0, 10, 40, nil, 0, 0, errRequestBeyondHead},
Expand Down Expand Up @@ -81,7 +82,7 @@ func TestFeeHistory(t *testing.T) {
if len(ratio) != c.expCount {
t.Fatalf("Test case %d: gasUsedRatio array length mismatch, want %d, got %d", i, c.expCount, len(ratio))
}
if err != c.expErr {
if err != c.expErr && !errors.Is(err, c.expErr) {
t.Fatalf("Test case %d: error mismatch, want %v, got %v", i, c.expErr, err)
}
}
Expand Down
30 changes: 15 additions & 15 deletions internal/ethapi/api.go
View file
Expand Up @@ -80,28 +80,28 @@ func (s *PublicEthereumAPI) MaxPriorityFeePerGas(ctx context.Context) (*hexutil.
return (*hexutil.Big)(tipcap), err
}

type feeHistoryResults struct {
FirstBlock rpc.BlockNumber
Reward [][]*hexutil.Big
BaseFee []*hexutil.Big
GasUsedRatio []float64
type feeHistoryResult struct {
OldestBlock rpc.BlockNumber `json:"oldestBlock"`
Reward [][]*hexutil.Big `json:"reward,omitempty"`
BaseFee []*hexutil.Big `json:"baseFeePerGas,omitempty"`
GasUsedRatio []float64 `json:"gasUsedRatio"`
}

func (s *PublicEthereumAPI) FeeHistory(ctx context.Context, blockCount int, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (feeHistoryResults, error) {
firstBlock, reward, baseFee, gasUsedRatio, err := s.b.FeeHistory(ctx, blockCount, lastBlock, rewardPercentiles)
func (s *PublicEthereumAPI) FeeHistory(ctx context.Context, blockCount int, lastBlock rpc.BlockNumber, rewardPercentiles []float64) (*feeHistoryResult, error) {
oldest, reward, baseFee, gasUsed, err := s.b.FeeHistory(ctx, blockCount, lastBlock, rewardPercentiles)
if err != nil {
return feeHistoryResults{}, err
return nil, err
}
results := feeHistoryResults{
FirstBlock: firstBlock,
GasUsedRatio: gasUsedRatio,
results := &feeHistoryResult{
OldestBlock: oldest,
GasUsedRatio: gasUsed,
}
if reward != nil {
results.Reward = make([][]*hexutil.Big, len(reward))
for j, w := range reward {
results.Reward[j] = make([]*hexutil.Big, len(w))
for i, v := range w {
results.Reward[j][i] = (*hexutil.Big)(v)
for i, w := range reward {
results.Reward[i] = make([]*hexutil.Big, len(w))
for j, v := range w {
results.Reward[i][j] = (*hexutil.Big)(v)
}
}
}
Expand Down
4 changes: 2 additions & 2 deletions miner/worker.go
View file
Expand Up @@ -162,7 +162,7 @@ type worker struct {
pendingMu sync.RWMutex
pendingTasks map[common.Hash]*task

snapshotMu sync.RWMutex // The lock used to protect the block snapshot and state snapshot
snapshotMu sync.RWMutex // The lock used to protect the snapshots below
snapshotBlock *types.Block
snapshotReceipts types.Receipts
snapshotState *state.StateDB
Expand Down Expand Up @@ -745,7 +745,7 @@ func (w *worker) updateSnapshot() {
w.current.receipts,
trie.NewStackTrie(nil),
)
w.snapshotReceipts = w.current.receipts
w.snapshotReceipts = copyReceipts(w.current.receipts)
w.snapshotState = w.current.state.Copy()
}

Expand Down

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