eth: use slices package for sorting (ethereum#27490)

Also adds Hash.Less method for sorting purposes.

---------

Co-authored-by: Felix Lange <fjl@twurst.com>

common/types.go

@@ -65,6 +65,11 @@ func BigToHash(b *big.Int) Hash { return BytesToHash(b.Bytes()) }
 // If b is larger than len(h), b will be cropped from the left.
 func HexToHash(s string) Hash { return BytesToHash(FromHex(s)) }
 
+// Less compares two hashes.
+func (h Hash) Less(other Hash) bool {
+	return bytes.Compare(h[:], other[:]) < 0
+}
+
 // Bytes gets the byte representation of the underlying hash.
 func (h Hash) Bytes() []byte { return h[:] }
 

eth/api_debug_test.go

@@ -21,7 +21,6 @@ import (
 	"fmt"
 	"math/big"
 	"reflect"
-	"sort"
 	"testing"
 
 	"github.com/davecgh/go-spew/spew"
@@ -31,6 +30,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/trie"
+	"golang.org/x/exp/slices"
 )
 
 var dumper = spew.ConfigState{Indent: "    "}
@@ -58,12 +58,6 @@ func accountRangeTest(t *testing.T, trie *state.Trie, statedb *state.StateDB, st
 	return result
 }
 
-type resultHash []common.Hash
-
-func (h resultHash) Len() int           { return len(h) }
-func (h resultHash) Swap(i, j int)      { h[i], h[j] = h[j], h[i] }
-func (h resultHash) Less(i, j int) bool { return bytes.Compare(h[i].Bytes(), h[j].Bytes()) < 0 }
-
 func TestAccountRange(t *testing.T) {
 	t.Parallel()
 
@@ -97,7 +91,7 @@ func TestAccountRange(t *testing.T) {
 	firstResult := accountRangeTest(t, &trie, state, common.Hash{}, AccountRangeMaxResults, AccountRangeMaxResults)
 	secondResult := accountRangeTest(t, &trie, state, common.BytesToHash(firstResult.Next), AccountRangeMaxResults, AccountRangeMaxResults)
 
-	hList := make(resultHash, 0)
+	hList := make([]common.Hash, 0)
 	for addr1 := range firstResult.Accounts {
 		// If address is empty, then it makes no sense to compare
 		// them as they might be two different accounts.
@@ -111,7 +105,7 @@ func TestAccountRange(t *testing.T) {
 	}
 	// Test to see if it's possible to recover from the middle of the previous
 	// set and get an even split between the first and second sets.
-	sort.Sort(hList)
+	slices.SortFunc(hList, common.Hash.Less)
 	middleH := hList[AccountRangeMaxResults/2]
 	middleResult := accountRangeTest(t, &trie, state, middleH, AccountRangeMaxResults, AccountRangeMaxResults)
 	missing, infirst, insecond := 0, 0, 0

eth/gasprice/feehistory.go

@@ -23,14 +23,14 @@ import (
 	"fmt"
 	"math"
 	"math/big"
-	"sort"
 	"sync/atomic"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/consensus/misc"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/rpc"
+	"golang.org/x/exp/slices"
 )
 
 var (
@@ -69,20 +69,9 @@ type processedFees struct {
 }
 
 // txGasAndReward is sorted in ascending order based on reward
-type (
-	txGasAndReward struct {
-		gasUsed uint64
-		reward  *big.Int
-	}
-	sortGasAndReward []txGasAndReward
-)
-
-func (s sortGasAndReward) Len() int { return len(s) }
-func (s sortGasAndReward) Swap(i, j int) {
-	s[i], s[j] = s[j], s[i]
-}
-func (s sortGasAndReward) Less(i, j int) bool {
-	return s[i].reward.Cmp(s[j].reward) < 0
+type txGasAndReward struct {
+	gasUsed uint64
+	reward  *big.Int
 }
 
 // processBlock takes a blockFees structure with the blockNumber, the header and optionally
@@ -117,12 +106,14 @@ func (oracle *Oracle) processBlock(bf *blockFees, percentiles []float64) {
 		return
 	}
 
-	sorter := make(sortGasAndReward, len(bf.block.Transactions()))
+	sorter := make([]txGasAndReward, len(bf.block.Transactions()))
 	for i, tx := range bf.block.Transactions() {
 		reward, _ := tx.EffectiveGasTip(bf.block.BaseFee())
 		sorter[i] = txGasAndReward{gasUsed: bf.receipts[i].GasUsed, reward: reward}
 	}
-	sort.Stable(sorter)
+	slices.SortStableFunc(sorter, func(a, b txGasAndReward) bool {
+		return a.reward.Cmp(b.reward) < 0
+	})
 
 	var txIndex int
 	sumGasUsed := sorter[0].gasUsed

eth/gasprice/gasprice.go

@@ -19,7 +19,6 @@ package gasprice
 import (
 	"context"
 	"math/big"
-	"sort"
 	"sync"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -30,6 +29,7 @@ import (
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/params"
 	"github.com/ethereum/go-ethereum/rpc"
+	"golang.org/x/exp/slices"
 )
 
 const sampleNumber = 3 // Number of transactions sampled in a block
@@ -208,7 +208,7 @@ func (oracle *Oracle) SuggestTipCap(ctx context.Context) (*big.Int, error) {
 	}
 	price := lastPrice
 	if len(results) > 0 {
-		sort.Sort(bigIntArray(results))
+		slices.SortFunc(results, func(a, b *big.Int) bool { return a.Cmp(b) < 0 })
 		price = results[(len(results)-1)*oracle.percentile/100]
 	}
 	if price.Cmp(oracle.maxPrice) > 0 {
@@ -227,30 +227,6 @@ type results struct {
 	err    error
 }
 
-type txSorter struct {
-	txs     []*types.Transaction
-	baseFee *big.Int
-}
-
-func newSorter(txs []*types.Transaction, baseFee *big.Int) *txSorter {
-	return &txSorter{
-		txs:     txs,
-		baseFee: baseFee,
-	}
-}
-
-func (s *txSorter) Len() int { return len(s.txs) }
-func (s *txSorter) Swap(i, j int) {
-	s.txs[i], s.txs[j] = s.txs[j], s.txs[i]
-}
-func (s *txSorter) Less(i, j int) bool {
-	// It's okay to discard the error because a tx would never be
-	// accepted into a block with an invalid effective tip.
-	tip1, _ := s.txs[i].EffectiveGasTip(s.baseFee)
-	tip2, _ := s.txs[j].EffectiveGasTip(s.baseFee)
-	return tip1.Cmp(tip2) < 0
-}
-
 // getBlockValues calculates the lowest transaction gas price in a given block
 // 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
@@ -267,14 +243,21 @@ func (oracle *Oracle) getBlockValues(ctx context.Context, blockNum uint64, limit
 	signer := types.MakeSigner(oracle.backend.ChainConfig(), block.Number(), block.Time())
 
 	// Sort the transaction by effective tip in ascending sort.
-	txs := make([]*types.Transaction, len(block.Transactions()))
-	copy(txs, block.Transactions())
-	sorter := newSorter(txs, block.BaseFee())
-	sort.Sort(sorter)
+	txs := block.Transactions()
+	sortedTxs := make([]*types.Transaction, len(txs))
+	copy(sortedTxs, txs)
+	baseFee := block.BaseFee()
+	slices.SortFunc(sortedTxs, func(a, b *types.Transaction) bool {
+		// It's okay to discard the error because a tx would never be
+		// accepted into a block with an invalid effective tip.
+		tip1, _ := a.EffectiveGasTip(baseFee)
+		tip2, _ := b.EffectiveGasTip(baseFee)
+		return tip1.Cmp(tip2) < 0
+	})
 
 	var prices []*big.Int
-	for _, tx := range sorter.txs {
-		tip, _ := tx.EffectiveGasTip(block.BaseFee())
+	for _, tx := range sortedTxs {
+		tip, _ := tx.EffectiveGasTip(baseFee)
 		if ignoreUnder != nil && tip.Cmp(ignoreUnder) == -1 {
 			continue
 		}
@@ -291,9 +274,3 @@ func (oracle *Oracle) getBlockValues(ctx context.Context, blockNum uint64, limit
 	case <-quit:
 	}
 }
-
-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] }