op-node: Periodically prune old peer score entries.

op-node/p2p/store/extended.go

@@ -5,6 +5,8 @@ import (
 	"errors"
 	"fmt"
 
+	"github.com/ethereum-optimism/optimism/op-service/clock"
+	"github.com/ethereum/go-ethereum/log"
 	ds "github.com/ipfs/go-datastore"
 	"github.com/libp2p/go-libp2p/core/peerstore"
 )
@@ -15,15 +17,16 @@ type extendedStore struct {
 	*scoreBook
 }
 
-func NewExtendedPeerstore(ctx context.Context, ps peerstore.Peerstore, store ds.Batching) (ExtendedPeerstore, error) {
+func NewExtendedPeerstore(ctx context.Context, logger log.Logger, clock clock.Clock, ps peerstore.Peerstore, store ds.Batching) (ExtendedPeerstore, error) {
 	cab, ok := peerstore.GetCertifiedAddrBook(ps)
 	if !ok {
 		return nil, errors.New("peerstore should also be a certified address book")
 	}
-	sb, err := newScoreBook(ctx, store)
+	sb, err := newScoreBook(ctx, logger, clock, store)
 	if err != nil {
 		return nil, fmt.Errorf("create scorebook: %w", err)
 	}
+	sb.startGC()
 	return &extendedStore{
 		Peerstore:         ps,
 		CertifiedAddrBook: cab,
@@ -31,4 +34,9 @@ func NewExtendedPeerstore(ctx context.Context, ps peerstore.Peerstore, store ds.
 	}, nil
 }
 
+func (s *extendedStore) Close() error {
+	s.scoreBook.Close()
+	return s.Peerstore.Close()
+}
+
 var _ ExtendedPeerstore = (*extendedStore)(nil)

op-node/p2p/store/gc.go

+package store
+
+import (
+	"context"
+	"sync"
+	"time"
+
+	"github.com/ethereum-optimism/optimism/op-service/clock"
+	"github.com/ethereum/go-ethereum/log"
+)
+
+const (
+	gcPeriod = 2 * time.Hour
+)
+
+type gcAction func() error
+
+func startGc(ctx context.Context, logger log.Logger, clock clock.Clock, bgTasks *sync.WaitGroup, action gcAction) {
+	bgTasks.Add(1)
+	go func() {
+		defer bgTasks.Done()
+
+		gcTimer := clock.NewTicker(gcPeriod)
+		defer gcTimer.Stop()
+
+		for {
+			select {
+			case <-gcTimer.Ch():
+				if err := action(); err != nil {
+					logger.Warn("GC failed", "err", err)
+				}
+
+			case <-ctx.Done():
+				return
+			}
+		}
+	}()
+}

op-node/p2p/store/gc_test.go

+package store
+
+import (
+	"context"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/ethereum-optimism/optimism/op-node/testlog"
+	"github.com/ethereum-optimism/optimism/op-service/clock"
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/stretchr/testify/require"
+)
+
+func TestScheduleGcPeriodically(t *testing.T) {
+	var bgTasks sync.WaitGroup
+	ctx, cancel := context.WithCancel(context.Background())
+	defer func() {
+		cancel()
+		// Wait for the gc background process to complete after cancelling the context
+		bgTasks.Wait()
+	}()
+	logger := testlog.Logger(t, log.LvlInfo)
+	clock := clock.NewDeterministicClock(time.UnixMilli(5000))
+
+	called := make(chan struct{}, 10)
+	action := func() error {
+		called <- struct{}{}
+		return nil
+	}
+	waitForGc := func(failMsg string) {
+		timeout, cancel := context.WithTimeout(ctx, 10*time.Second)
+		defer cancel()
+		select {
+		case <-timeout.Done():
+			t.Fatal(failMsg)
+		case <-called:
+			require.Len(t, called, 0, "should only run once after gc period")
+		}
+	}
+	startGc(ctx, logger, clock, &bgTasks, action)
+	timeout, tCancel := context.WithTimeout(ctx, 10*time.Second)
+	defer tCancel()
+	require.True(t, clock.WaitForNewPendingTask(timeout), "did not schedule pending GC")
+
+	require.Len(t, called, 0, "should not run immediately")
+
+	clock.AdvanceTime(gcPeriod)
+	waitForGc("should run gc after first time period")
+
+	clock.AdvanceTime(gcPeriod)
+	waitForGc("should run gc again after second time period")
+}

op-node/p2p/store/scorebook.go

@@ -5,71 +5,101 @@ import (
 	"errors"
 	"fmt"
 	"sync"
+	"time"
 
+	"github.com/ethereum-optimism/optimism/op-service/clock"
+	"github.com/ethereum/go-ethereum/log"
 	lru "github.com/hashicorp/golang-lru/v2"
 	ds "github.com/ipfs/go-datastore"
+	"github.com/ipfs/go-datastore/query"
 	"github.com/libp2p/go-libp2p/core/peer"
 	"github.com/multiformats/go-base32"
 )
 
-type scoreBook struct {
-	ctx   context.Context
-	store ds.Batching
-	cache *lru.Cache[peer.ID, PeerScores]
-	sync.RWMutex
-}
+const (
+	scoreDataV0       = "0"
+	scoreCacheSize    = 100
+	expiryPeriod      = 24 * time.Hour
+	maxPruneBatchSize = 20
+)
 
 var scoresBase = ds.NewKey("/peers/scores")
 
-const (
-	scoreDataV0    = "0"
-	scoreCacheSize = 100
-)
+type scoreRecord struct {
+	PeerScores
+	lastUpdate time.Time
+}
+
+type scoreBook struct {
+	ctx      context.Context
+	cancelFn context.CancelFunc
+	clock    clock.Clock
+	log      log.Logger
+	bgTasks  sync.WaitGroup
+	store    ds.Batching
+	cache    *lru.Cache[peer.ID, scoreRecord]
+	sync.RWMutex
+}
 
-func newScoreBook(ctx context.Context, store ds.Batching) (*scoreBook, error) {
-	cache, err := lru.New[peer.ID, PeerScores](scoreCacheSize)
+func newScoreBook(ctx context.Context, logger log.Logger, clock clock.Clock, store ds.Batching) (*scoreBook, error) {
+	cache, err := lru.New[peer.ID, scoreRecord](scoreCacheSize)
 	if err != nil {
 		return nil, fmt.Errorf("creating cache: %w", err)
 	}
-	return &scoreBook{
-		ctx:   ctx,
-		store: store,
-		cache: cache,
-	}, nil
+
+	ctx, cancelFn := context.WithCancel(ctx)
+	book := scoreBook{
+		ctx:      ctx,
+		cancelFn: cancelFn,
+		clock:    clock,
+		log:      logger,
+		store:    store,
+		cache:    cache,
+	}
+	return &book, nil
+}
+
+func (d *scoreBook) startGC() {
+	startGc(d.ctx, d.log, d.clock, &d.bgTasks, d.prune)
 }
 
 func (d *scoreBook) GetPeerScores(id peer.ID) (PeerScores, error) {
 	d.RLock()
 	defer d.RUnlock()
-	return d.getPeerScoresNoLock(id)
+	record, err := d.getRecord(id)
+	if err != nil {
+		return PeerScores{}, nil
+	}
+	return record.PeerScores, err
 }
 
-func (d *scoreBook) getPeerScoresNoLock(id peer.ID) (PeerScores, error) {
-	scores, ok := d.cache.Get(id)
-	if ok {
+func (d *scoreBook) getRecord(id peer.ID) (scoreRecord, error) {
+	if scores, ok := d.cache.Get(id); ok {
 		return scores, nil
 	}
 	data, err := d.store.Get(d.ctx, scoreKey(id))
 	if errors.Is(err, ds.ErrNotFound) {
-		return PeerScores{}, nil
+		return scoreRecord{}, nil
 	} else if err != nil {
-		return PeerScores{}, fmt.Errorf("load scores for peer %v: %w", id, err)
+		return scoreRecord{}, fmt.Errorf("load scores for peer %v: %w", id, err)
 	}
-	scores, err = deserializeScoresV0(data)
+	record, err := deserializeScoresV0(data)
 	if err != nil {
-		return PeerScores{}, fmt.Errorf("invalid score data for peer %v: %w", id, err)
+		return scoreRecord{}, fmt.Errorf("invalid score data for peer %v: %w", id, err)
 	}
-	d.cache.Add(id, scores)
-	return scores, nil
+	d.cache.Add(id, record)
+	return record, nil
 }
 
 func (d *scoreBook) SetScore(id peer.ID, scoreType ScoreType, score float64) error {
 	d.Lock()
 	defer d.Unlock()
-	scores, err := d.getPeerScoresNoLock(id)
+	scores, err := d.getRecord(id)
 	if err != nil {
 		return err
 	}
+	scores.lastUpdate = d.clock.Now()
+	scores.Gossip = score
 	switch scoreType {
 	case TypeGossip:
 		scores.Gossip = score
@@ -88,6 +118,61 @@ func (d *scoreBook) SetScore(id peer.ID, scoreType ScoreType, score float64) err
 	return nil
 }
 
+// prune deletes entries from the store that are older than expiryPeriod.
+// Note that the expiry period is not a strict TTL. Entries that are eligible for deletion may still be present
+// either because the prune function hasn't yet run or because they are still preserved in the in-memory cache after
+// having been deleted from the database.
+func (d *scoreBook) prune() error {
+	results, err := d.store.Query(d.ctx, query.Query{
+		Prefix: scoresBase.String(),
+	})
+	if err != nil {
+		return err
+	}
+	pending := 0
+	batch, err := d.store.Batch(d.ctx)
+	if err != nil {
+		return err
+	}
+	for result := range results.Next() {
+		// Bail out if the context is done
+		select {
+		case <-d.ctx.Done():
+			return d.ctx.Err()
+		default:
+		}
+		record, err := deserializeScoresV0(result.Value)
+		if err != nil {
+			return err
+		}
+		if record.lastUpdate.Add(expiryPeriod).Before(d.clock.Now()) {
+			if pending > maxPruneBatchSize {
+				if err := batch.Commit(d.ctx); err != nil {
+					return err
+				}
+				batch, err = d.store.Batch(d.ctx)
+				if err != nil {
+					return err
+				}
+				pending = 0
+			}
+			pending++
+			if err := batch.Delete(d.ctx, ds.NewKey(result.Key)); err != nil {
+				return err
+			}
+		}
+	}
+	if err := batch.Commit(d.ctx); err != nil {
+		return err
+	}
+	return nil
+}
+
+func (d *scoreBook) Close() {
+	d.cancelFn()
+	d.bgTasks.Wait()
+}
+
 func scoreKey(id peer.ID) ds.Key {
 	return scoresBase.ChildString(base32.RawStdEncoding.EncodeToString([]byte(id))).ChildString(scoreDataV0)
 }

op-node/p2p/store/scorebook_test.go

@@ -2,8 +2,13 @@ package store
 
 import (
 	"context"
+	"strconv"
 	"testing"
+	"time"
 
+	"github.com/ethereum-optimism/optimism/op-node/testlog"
+	"github.com/ethereum-optimism/optimism/op-service/clock"
+	"github.com/ethereum/go-ethereum/log"
 	ds "github.com/ipfs/go-datastore"
 	"github.com/ipfs/go-datastore/sync"
 	"github.com/libp2p/go-libp2p/core/peer"
@@ -71,6 +76,95 @@ func TestUnknownScoreType(t *testing.T) {
 	require.ErrorContains(t, err, "unknown score type")
 }
 
+func TestCloseCompletes(t *testing.T) {
+	store := createMemoryStore(t)
+	require.NoError(t, store.Close())
+}
+
+func TestPrune(t *testing.T) {
+	ctx, cancelFunc := context.WithCancel(context.Background())
+	defer cancelFunc()
+	logger := testlog.Logger(t, log.LvlInfo)
+	store := sync.MutexWrap(ds.NewMapDatastore())
+	clock := clock.NewDeterministicClock(time.UnixMilli(1000))
+	book, err := newScoreBook(ctx, logger, clock, store)
+	require.NoError(t, err)
+
+	hasScoreRecorded := func(id peer.ID) bool {
+		scores, err := book.GetPeerScores(id)
+		require.NoError(t, err)
+		return scores != PeerScores{}
+	}
+
+	firstStore := clock.Now()
+	// Set some scores all 30 minutes apart so they have different expiry times
+	require.NoError(t, book.SetScore("aaaa", TypeGossip, 123.45))
+	clock.AdvanceTime(30 * time.Minute)
+	require.NoError(t, book.SetScore("bbbb", TypeGossip, 123.45))
+	clock.AdvanceTime(30 * time.Minute)
+	require.NoError(t, book.SetScore("cccc", TypeGossip, 123.45))
+	clock.AdvanceTime(30 * time.Minute)
+	require.NoError(t, book.SetScore("dddd", TypeGossip, 123.45))
+	clock.AdvanceTime(30 * time.Minute)
+
+	// Update bbbb again which should extend its expiry
+	require.NoError(t, book.SetScore("bbbb", TypeGossip, 123.45))
+
+	require.True(t, hasScoreRecorded("aaaa"))
+	require.True(t, hasScoreRecorded("bbbb"))
+	require.True(t, hasScoreRecorded("cccc"))
+	require.True(t, hasScoreRecorded("dddd"))
+
+	elapsedTime := clock.Now().Sub(firstStore)
+	timeToFirstExpiry := expiryPeriod - elapsedTime
+	// Advance time until the score for aaaa should be pruned.
+	clock.AdvanceTime(timeToFirstExpiry + 1)
+	require.NoError(t, book.prune())
+	// Clear the cache so reads have to come from the database
+	book.cache.Purge()
+	require.False(t, hasScoreRecorded("aaaa"), "should have pruned aaaa record")
+
+	// Advance time so cccc, dddd and the original bbbb entry should be pruned
+	clock.AdvanceTime(90 * time.Minute)
+	require.NoError(t, book.prune())
+	// Clear the cache so reads have to come from the database
+	book.cache.Purge()
+
+	require.False(t, hasScoreRecorded("cccc"), "should have pruned cccc record")
+	require.False(t, hasScoreRecorded("dddd"), "should have pruned cccc record")
+
+	require.True(t, hasScoreRecorded("bbbb"), "should not prune bbbb record")
+}
+
+func TestPruneMultipleBatches(t *testing.T) {
+	ctx, cancelFunc := context.WithCancel(context.Background())
+	defer cancelFunc()
+	logger := testlog.Logger(t, log.LvlInfo)
+	clock := clock.NewDeterministicClock(time.UnixMilli(1000))
+	book, err := newScoreBook(ctx, logger, clock, sync.MutexWrap(ds.NewMapDatastore()))
+	require.NoError(t, err)
+
+	hasScoreRecorded := func(id peer.ID) bool {
+		scores, err := book.GetPeerScores(id)
+		require.NoError(t, err)
+		return scores != PeerScores{}
+	}
+
+	// Set scores for more peers than the max batch size
+	peerCount := maxPruneBatchSize*3 + 5
+	for i := 0; i < peerCount; i++ {
+		require.NoError(t, book.SetScore(peer.ID(strconv.Itoa(i)), TypeGossip, 123.45))
+	}
+	clock.AdvanceTime(expiryPeriod + 1)
+	require.NoError(t, book.prune())
+	// Clear the cache so reads have to come from the database
+	book.cache.Purge()
+
+	for i := 0; i < peerCount; i++ {
+		require.Falsef(t, hasScoreRecorded(peer.ID(strconv.Itoa(i))), "Should prune record peer %v", i)
+	}
+}
+
 func assertPeerScores(t *testing.T, store ExtendedPeerstore, id peer.ID, expected PeerScores) {
 	result, err := store.GetPeerScores(id)
 	require.NoError(t, err)
@@ -85,7 +179,12 @@ func createMemoryStore(t *testing.T) ExtendedPeerstore {
 func createPeerstoreWithBacking(t *testing.T, store *sync.MutexDatastore) ExtendedPeerstore {
 	ps, err := pstoreds.NewPeerstore(context.Background(), store, pstoreds.DefaultOpts())
 	require.NoError(t, err, "Failed to create peerstore")
-	eps, err := NewExtendedPeerstore(context.Background(), ps, store)
+	logger := testlog.Logger(t, log.LvlInfo)
+	clock := clock.NewDeterministicClock(time.UnixMilli(100))
+	eps, err := NewExtendedPeerstore(context.Background(), logger, clock, ps, store)
 	require.NoError(t, err)
+	t.Cleanup(func() {
+		_ = eps.Close()
+	})
 	return eps
 }

op-node/p2p/store/serialize.go

@@ -3,23 +3,34 @@ package store
 import (
 	"bytes"
 	"encoding/binary"
+	"time"
 )
 
-func serializeScoresV0(scores PeerScores) ([]byte, error) {
+func serializeScoresV0(scores scoreRecord) ([]byte, error) {
 	var b bytes.Buffer
-	err := binary.Write(&b, binary.BigEndian, scores.Gossip)
+	err := binary.Write(&b, binary.BigEndian, scores.lastUpdate.UnixMilli())
+	if err != nil {
+		return nil, err
+	}
+	err = binary.Write(&b, binary.BigEndian, scores.Gossip)
 	if err != nil {
 		return nil, err
 	}
 	return b.Bytes(), nil
 }
 
-func deserializeScoresV0(data []byte) (PeerScores, error) {
-	var scores PeerScores
+func deserializeScoresV0(data []byte) (scoreRecord, error) {
+	var scores scoreRecord
 	r := bytes.NewReader(data)
-	err := binary.Read(r, binary.BigEndian, &scores.Gossip)
+	var lastUpdate int64
+	err := binary.Read(r, binary.BigEndian, &lastUpdate)
+	if err != nil {
+		return scoreRecord{}, err
+	}
+	scores.lastUpdate = time.UnixMilli(lastUpdate)
+	err = binary.Read(r, binary.BigEndian, &scores.Gossip)
 	if err != nil {
-		return PeerScores{}, err
+		return scoreRecord{}, err
 	}
 	return scores, nil
 }

op-node/p2p/store/serialize_test.go

 package store
 
 import (
+	"strconv"
 	"testing"
+	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/stretchr/testify/require"
 )
 
 func TestRoundtripScoresV0(t *testing.T) {
-	scores := PeerScores{
-		Gossip: 1234.52382,
+	scores := scoreRecord{
+		PeerScores: PeerScores{Gossip: 1234.52382},
+		lastUpdate: time.UnixMilli(1923841),
 	}
 	data, err := serializeScoresV0(scores)
 	require.NoError(t, err)
@@ -24,19 +27,20 @@ func TestRoundtripScoresV0(t *testing.T) {
 // A new entry should be added to this test each time any fields are changed to ensure it can always be deserialized
 func TestParseHistoricSerializationsV0(t *testing.T) {
 	tests := []struct {
-		name     string
 		data     []byte
-		expected PeerScores
+		expected scoreRecord
 	}{
 		{
-			name:     "GossipOnly",
-			data:     common.Hex2Bytes("40934A18644523F6"),
-			expected: PeerScores{Gossip: 1234.52382},
+			data: common.Hex2Bytes("00000000001D5B0140934A18644523F6"),
+			expected: scoreRecord{
+				PeerScores: PeerScores{Gossip: 1234.52382},
+				lastUpdate: time.UnixMilli(1923841),
+			},
 		},
 	}
-	for _, test := range tests {
+	for idx, test := range tests {
 		test := test
-		t.Run(test.name, func(t *testing.T) {
+		t.Run(strconv.Itoa(idx), func(t *testing.T) {
 			result, err := deserializeScoresV0(test.data)
 			require.NoError(t, err)
 			require.Equal(t, test.expected, result)