op-node: Add extended peerstore

Supports storing gossip scores for peers.

op-node/p2p/store/extended.go

+package store
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	ds "github.com/ipfs/go-datastore"
+	"github.com/libp2p/go-libp2p/core/peerstore"
+)
+
+type extendedStore struct {
+	peerstore.Peerstore
+	peerstore.CertifiedAddrBook
+	*scoreBook
+}
+
+func NewExtendedPeerstore(ctx context.Context, 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)
+	if err != nil {
+		return nil, fmt.Errorf("create scorebook: %w", err)
+	}
+	return &extendedStore{
+		Peerstore:         ps,
+		CertifiedAddrBook: cab,
+		scoreBook:         sb,
+	}, nil
+}
+
+var _ ExtendedPeerstore = (*extendedStore)(nil)

op-node/p2p/store/iface.go

+package store
+
+import (
+	"github.com/libp2p/go-libp2p/core/peer"
+	"github.com/libp2p/go-libp2p/core/peerstore"
+)
+
+type PeerScores struct {
+	Gossip float64
+}
+
+// ScoreDatastore defines a type-safe API for getting and setting libp2p peer score information
+type ScoreDatastore interface {
+	// GetPeerScores returns the current scores for the specified peer
+	GetPeerScores(id peer.ID) (PeerScores, error)
+
+	// SetGossipScore stores the latest gossip score for a peer
+	SetGossipScore(id peer.ID, score float64) error
+}
+
+// ExtendedPeerstore defines a type-safe API to work with additional peer metadata based on a libp2p peerstore.Peerstore
+type ExtendedPeerstore interface {
+	peerstore.Peerstore
+	ScoreDatastore
+	peerstore.CertifiedAddrBook
+}

op-node/p2p/store/scorebook.go

+package store
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"sync"
+
+	lru "github.com/hashicorp/golang-lru/v2"
+	ds "github.com/ipfs/go-datastore"
+	"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
+}
+
+var scoresBase = ds.NewKey("/peers/scores")
+
+type ScoreType string
+
+const (
+	scoreDataV0    = "0"
+	scoreCacheSize = 100
+)
+
+func newScoreBook(ctx context.Context, store ds.Batching) (*scoreBook, error) {
+	cache, err := lru.New[peer.ID, PeerScores](scoreCacheSize)
+	if err != nil {
+		return nil, fmt.Errorf("creating cache: %w", err)
+	}
+	return &scoreBook{
+		ctx:   ctx,
+		store: store,
+		cache: cache,
+	}, nil
+}
+
+func (d *scoreBook) GetPeerScores(id peer.ID) (PeerScores, error) {
+	d.RLock()
+	defer d.RUnlock()
+	return d.getPeerScoresNoLock(id)
+}
+
+func (d *scoreBook) getPeerScoresNoLock(id peer.ID) (PeerScores, error) {
+	scores, ok := d.cache.Get(id)
+	if ok {
+		return scores, nil
+	}
+	data, err := d.store.Get(d.ctx, scoreKey(id))
+	if errors.Is(err, ds.ErrNotFound) {
+		return PeerScores{}, nil
+	} else if err != nil {
+		return PeerScores{}, fmt.Errorf("load scores for peer %v: %w", id, err)
+	}
+	scores, err = deserializeScoresV0(data)
+	if err != nil {
+		return PeerScores{}, fmt.Errorf("invalid score data for peer %v: %w", id, err)
+	}
+	d.cache.Add(id, scores)
+	return scores, nil
+}
+
+func (d *scoreBook) SetGossipScore(id peer.ID, score float64) error {
+	d.Lock()
+	defer d.Unlock()
+	scores, err := d.getPeerScoresNoLock(id)
+	if err != nil {
+		return err
+	}
+	scores.Gossip = score
+	data, err := serializeScoresV0(scores)
+	if err != nil {
+		return fmt.Errorf("encode scores for peer %v: %w", id, err)
+	}
+	err = d.store.Put(d.ctx, scoreKey(id), data)
+	if err != nil {
+		return fmt.Errorf("storing updated scores for peer %v: %w", id, err)
+	}
+	d.cache.Add(id, scores)
+	return nil
+}
+
+func scoreKey(id peer.ID) ds.Key {
+	return scoresBase.ChildString(base32.RawStdEncoding.EncodeToString([]byte(id))).ChildString(scoreDataV0)
+}

op-node/p2p/store/scorebook_test.go

+package store
+
+import (
+	"context"
+	"testing"
+
+	ds "github.com/ipfs/go-datastore"
+	"github.com/ipfs/go-datastore/sync"
+	"github.com/libp2p/go-libp2p/core/peer"
+	"github.com/libp2p/go-libp2p/p2p/host/peerstore/pstoreds"
+	"github.com/stretchr/testify/require"
+)
+
+func TestGetEmptyScoreComponents(t *testing.T) {
+	id := peer.ID("aaaa")
+	store := createMemoryStore(t)
+	assertPeerScores(t, store, id, PeerScores{})
+}
+
+func TestRoundTripGossipScore(t *testing.T) {
+	id := peer.ID("aaaa")
+	store := createMemoryStore(t)
+	score := 123.45
+	err := store.SetGossipScore(id, score)
+	require.NoError(t, err)
+
+	assertPeerScores(t, store, id, PeerScores{Gossip: score})
+}
+
+func TestUpdateGossipScore(t *testing.T) {
+	id := peer.ID("aaaa")
+	store := createMemoryStore(t)
+	score := 123.45
+	require.NoError(t, store.SetGossipScore(id, 444.223))
+	require.NoError(t, store.SetGossipScore(id, score))
+
+	assertPeerScores(t, store, id, PeerScores{Gossip: score})
+}
+
+func TestStoreScoresForMultiplePeers(t *testing.T) {
+	id1 := peer.ID("aaaa")
+	id2 := peer.ID("bbbb")
+	store := createMemoryStore(t)
+	score1 := 123.45
+	score2 := 453.22
+	require.NoError(t, store.SetGossipScore(id1, score1))
+	require.NoError(t, store.SetGossipScore(id2, score2))
+
+	assertPeerScores(t, store, id1, PeerScores{Gossip: score1})
+	assertPeerScores(t, store, id2, PeerScores{Gossip: score2})
+}
+
+func TestPersistData(t *testing.T) {
+	id := peer.ID("aaaa")
+	score := 123.45
+	backingStore := sync.MutexWrap(ds.NewMapDatastore())
+	store := createPeerstoreWithBacking(t, backingStore)
+
+	require.NoError(t, store.SetGossipScore(id, score))
+
+	// Close and recreate a new store from the same backing
+	require.NoError(t, store.Close())
+	store = createPeerstoreWithBacking(t, backingStore)
+
+	assertPeerScores(t, store, id, PeerScores{Gossip: score})
+}
+
+func assertPeerScores(t *testing.T, store ExtendedPeerstore, id peer.ID, expected PeerScores) {
+	result, err := store.GetPeerScores(id)
+	require.NoError(t, err)
+	require.Equal(t, result, expected)
+}
+
+func createMemoryStore(t *testing.T) ExtendedPeerstore {
+	store := sync.MutexWrap(ds.NewMapDatastore())
+	return createPeerstoreWithBacking(t, store)
+}
+
+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)
+	require.NoError(t, err)
+	return eps
+}

op-node/p2p/store/serialize.go

+package store
+
+import (
+	"bytes"
+	"encoding/binary"
+
+	pool "github.com/libp2p/go-buffer-pool"
+)
+
+func serializeScoresV0(scores PeerScores) ([]byte, error) {
+	var b pool.Buffer
+	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
+	r := bytes.NewReader(data)
+	err := binary.Read(r, binary.BigEndian, &scores.Gossip)
+	if err != nil {
+		return PeerScores{}, err
+	}
+	return scores, nil
+}

op-node/p2p/store/serialize_test.go

+package store
+
+import (
+	"testing"
+
+	"github.com/status-im/keycard-go/hexutils"
+	"github.com/stretchr/testify/require"
+)
+
+func TestRoundtripScoresV0(t *testing.T) {
+	scores := PeerScores{
+		Gossip: 1234.52382,
+	}
+	data, err := serializeScoresV0(scores)
+	require.NoError(t, err)
+
+	result, err := deserializeScoresV0(data)
+	require.NoError(t, err)
+	require.Equal(t, scores, result)
+}
+
+// TestParseHistoricSerializations checks that existing data can still be deserialized
+// Adding new fields should not require bumping the version, only removing fields
+// 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
+	}{
+		{
+			name:     "GossipOnly",
+			data:     hexutils.HexToBytes("40934A18644523F6"),
+			expected: PeerScores{Gossip: 1234.52382},
+		},
+	}
+	for _, test := range tests {
+		test := test
+		t.Run(test.name, func(t *testing.T) {
+			result, err := deserializeScoresV0(test.data)
+			require.NoError(t, err)
+			require.Equal(t, test.expected, result)
+		})
+	}
+}