fix: noisy peer exchange log (#881)

waku/v2/protocol/peer_exchange/enr_cache.go

@@ -9,6 +9,7 @@ import (
 	"github.com/ethereum/go-ethereum/p2p/enode"
 	"github.com/hashicorp/golang-lru/simplelru"
 	"github.com/waku-org/go-waku/waku/v2/protocol/peer_exchange/pb"
+	"go.uber.org/zap"
 )
 
 // simpleLRU internal uses container/list, which is ring buffer(double linked list)
@@ -17,14 +18,16 @@ type enrCache struct {
 	data *simplelru.LRU
 	rng  *rand.Rand
 	mu   sync.RWMutex
+	log  *zap.Logger
 }
 
 // err on negative size
-func newEnrCache(size int) (*enrCache, error) {
+func newEnrCache(size int, log *zap.Logger) (*enrCache, error) {
 	inner, err := simplelru.NewLRU(size, nil)
 	return &enrCache{
 		data: inner,
 		rng:  rand.New(rand.NewSource(rand.Int63())),
+		log:  log.Named("enr-cache"),
 	}, err
 }
 
@@ -35,6 +38,7 @@ func (c *enrCache) updateCache(node *enode.Node) {
 	currNode, ok := c.data.Get(node.ID())
 	if !ok || node.Seq() > currNode.(*enode.Node).Seq() {
 		c.data.Add(node.ID(), node)
+		c.log.Debug("discovered px peer via discv5", zap.Stringer("enr", node))
 	}
 }
 

waku/v2/protocol/peer_exchange/protocol.go

@@ -53,19 +53,21 @@ type WakuPeerExchange struct {
 // Takes an optional peermanager if WakuPeerExchange is being created along with WakuNode.
 // If using libp2p host, then pass peermanager as nil
 func NewWakuPeerExchange(disc *discv5.DiscoveryV5, peerConnector PeerConnector, pm *peermanager.PeerManager, reg prometheus.Registerer, log *zap.Logger) (*WakuPeerExchange, error) {
-	newEnrCache, err := newEnrCache(MaxCacheSize)
-	if err != nil {
-		return nil, err
-	}
 	wakuPX := new(WakuPeerExchange)
 	wakuPX.disc = disc
 	wakuPX.metrics = newMetrics(reg)
 	wakuPX.log = log.Named("wakupx")
-	wakuPX.enrCache = newEnrCache
 	wakuPX.peerConnector = peerConnector
 	wakuPX.pm = pm
 	wakuPX.CommonService = service.NewCommonService()
 
+	newEnrCache, err := newEnrCache(MaxCacheSize, wakuPX.log)
+	if err != nil {
+		return nil, err
+	}
+
+	wakuPX.enrCache = newEnrCache
+
 	return wakuPX, nil
 }
 
@@ -159,7 +161,6 @@ func (wakuPX *WakuPeerExchange) iterate(ctx context.Context) error {
 			continue
 		}
 
-		wakuPX.log.Debug("Discovered px peers via discv5")
 		wakuPX.enrCache.updateCache(iterator.Node())
 
 		select {