fix logging

p2p/host/autorelay/autorelay.go

@@ -2,6 +2,7 @@ package autorelay
 
 import (
 	"context"
+	"errors"
 	"sync"
 
 	"github.com/libp2p/go-libp2p/core/event"
@@ -83,7 +84,10 @@ func (r *AutoRelay) background() {
 			evt := ev.(event.EvtLocalReachabilityChanged)
 			switch evt.Reachability {
 			case network.ReachabilityPrivate, network.ReachabilityUnknown:
-				if err := r.relayFinder.Start(); err != nil {
+				err := r.relayFinder.Start()
+				if errors.Is(err, errAlreadyRunning) {
+					log.Debug("tried to start already running relay finder")
+				} else if err != nil {
 					log.Errorw("failed to start relay finder", "error", err)
 				} else {
 					r.metricsTracer.RelayFinderStatus(true)

p2p/host/autorelay/relay_finder.go

@@ -83,6 +83,8 @@ type relayFinder struct {
 	metricsTracer           MetricsTracer
 }
 
+var errAlreadyRunning = errors.New("relayFinder already running")
+
 func newRelayFinder(host *basic.BasicHost, peerSource PeerSource, conf *config) *relayFinder {
 	if peerSource == nil {
 		panic("Can not create a new relayFinder. Need a Peer Source fn or a list of static relays. Refer to the documentation around `libp2p.EnableAutoRelay`")
@@ -754,7 +756,7 @@ func (rf *relayFinder) Start() error {
 	rf.ctxCancelMx.Lock()
 	defer rf.ctxCancelMx.Unlock()
 	if rf.ctxCancel != nil {
-		return errors.New("relayFinder already running")
+		return errAlreadyRunning
 	}
 	log.Debug("starting relay finder")
 	ctx, cancel := context.WithCancel(context.Background())