[client] Fix race conditions (#2869)

* Fix concurrent map access in status

* Fix race when retrieving ctx state error

* Fix race when accessing service controller server instance

client/cmd/service.go

@@ -2,6 +2,7 @@ package cmd
 
 import (
 	"context"
+	"sync"
 
 	"github.com/kardianos/service"
 	log "github.com/sirupsen/logrus"
@@ -13,10 +14,11 @@ import (
 )
 
 type program struct {
-	ctx            context.Context
-	cancel         context.CancelFunc
-	serv           *grpc.Server
-	serverInstance *server.Server
+	ctx              context.Context
+	cancel           context.CancelFunc
+	serv             *grpc.Server
+	serverInstance   *server.Server
+	serverInstanceMu sync.Mutex
 }
 
 func newProgram(ctx context.Context, cancel context.CancelFunc) *program {

client/cmd/service_controller.go

@@ -61,7 +61,9 @@ func (p *program) Start(svc service.Service) error {
 		}
 		proto.RegisterDaemonServiceServer(p.serv, serverInstance)
 
+		p.serverInstanceMu.Lock()
 		p.serverInstance = serverInstance
+		p.serverInstanceMu.Unlock()
 
 		log.Printf("started daemon server: %v", split[1])
 		if err := p.serv.Serve(listen); err != nil {
@@ -72,6 +74,7 @@ func (p *program) Start(svc service.Service) error {
 }
 
 func (p *program) Stop(srv service.Service) error {
+	p.serverInstanceMu.Lock()
 	if p.serverInstance != nil {
 		in := new(proto.DownRequest)
 		_, err := p.serverInstance.Down(p.ctx, in)
@@ -79,6 +82,7 @@ func (p *program) Stop(srv service.Service) error {
 			log.Errorf("failed to stop daemon: %v", err)
 		}
 	}
+	p.serverInstanceMu.Unlock()
 
 	p.cancel()
 

client/iface/wgproxy/bind/proxy.go

@@ -2,6 +2,7 @@ package bind
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"net"
 	"net/netip"
@@ -94,7 +95,10 @@ func (p *ProxyBind) close() error {
 
 	p.Bind.RemoveEndpoint(p.wgAddr)
 
-	return p.remoteConn.Close()
+	if rErr := p.remoteConn.Close(); rErr != nil && !errors.Is(rErr, net.ErrClosed) {
+		return rErr
+	}
+	return nil
 }
 
 func (p *ProxyBind) proxyToLocal(ctx context.Context) {

client/iface/wgproxy/ebpf/wrapper.go

@@ -77,7 +77,7 @@ func (e *ProxyWrapper) CloseConn() error {
 
 	e.cancel()
 
-	if err := e.remoteConn.Close(); err != nil {
+	if err := e.remoteConn.Close(); err != nil && !errors.Is(err, net.ErrClosed) {
 		return fmt.Errorf("failed to close remote conn: %w", err)
 	}
 	return nil

client/iface/wgproxy/udp/proxy.go

@@ -116,7 +116,7 @@ func (p *WGUDPProxy) close() error {
 	p.cancel()
 
 	var result *multierror.Error
-	if err := p.remoteConn.Close(); err != nil {
+	if err := p.remoteConn.Close(); err != nil && !errors.Is(err, net.ErrClosed) {
 		result = multierror.Append(result, fmt.Errorf("remote conn: %s", err))
 	}
 

client/internal/connect.go

@@ -207,7 +207,8 @@ func (c *ConnectClient) run(mobileDependency MobileDependency, probes *ProbeHold
 
 		c.statusRecorder.MarkSignalDisconnected(nil)
 		defer func() {
-			c.statusRecorder.MarkSignalDisconnected(state.err)
+			_, err := state.Status()
+			c.statusRecorder.MarkSignalDisconnected(err)
 		}()
 
 		// with the global Wiretrustee config in hand connect (just a connection, no stream yet) Signal

client/internal/peer/conn.go

@@ -442,7 +442,7 @@ func (conn *Conn) relayConnectionIsReady(rci RelayConnInfo) {
 
 	if conn.iceP2PIsActive() {
 		conn.log.Debugf("do not switch to relay because current priority is: %v", conn.currentConnPriority)
-		conn.wgProxyRelay = wgProxy
+		conn.setRelayedProxy(wgProxy)
 		conn.statusRelay.Set(StatusConnected)
 		conn.updateRelayStatus(rci.relayedConn.RemoteAddr().String(), rci.rosenpassPubKey)
 		return
@@ -465,7 +465,7 @@ func (conn *Conn) relayConnectionIsReady(rci RelayConnInfo) {
 	wgConfigWorkaround()
 	conn.currentConnPriority = connPriorityRelay
 	conn.statusRelay.Set(StatusConnected)
-	conn.wgProxyRelay = wgProxy
+	conn.setRelayedProxy(wgProxy)
 	conn.updateRelayStatus(rci.relayedConn.RemoteAddr().String(), rci.rosenpassPubKey)
 	conn.log.Infof("start to communicate with peer via relay")
 	conn.doOnConnected(rci.rosenpassPubKey, rci.rosenpassAddr)
@@ -736,6 +736,15 @@ func (conn *Conn) logTraceConnState() {
 	}
 }
 
+func (conn *Conn) setRelayedProxy(proxy wgproxy.Proxy) {
+	if conn.wgProxyRelay != nil {
+		if err := conn.wgProxyRelay.CloseConn(); err != nil {
+			conn.log.Warnf("failed to close deprecated wg proxy conn: %v", err)
+		}
+	}
+	conn.wgProxyRelay = proxy
+}
+
 func isController(config ConnConfig) bool {
 	return config.LocalKey > config.Key
 }

client/internal/peer/status.go

@@ -67,7 +67,7 @@ func (s *State) DeleteRoute(network string) {
 func (s *State) GetRoutes() map[string]struct{} {
 	s.Mux.RLock()
 	defer s.Mux.RUnlock()
-	return s.routes
+	return maps.Clone(s.routes)
 }
 
 // LocalPeerState contains the latest state of the local peer
@@ -237,10 +237,6 @@ func (d *Status) UpdatePeerState(receivedState State) error {
 		peerState.IP = receivedState.IP
 	}
 
-	if receivedState.GetRoutes() != nil {
-		peerState.SetRoutes(receivedState.GetRoutes())
-	}
-
 	skipNotification := shouldSkipNotify(receivedState.ConnStatus, peerState)
 
 	if receivedState.ConnStatus != peerState.ConnStatus {
@@ -261,12 +257,40 @@ func (d *Status) UpdatePeerState(receivedState State) error {
 		return nil
 	}
 
-	ch, found := d.changeNotify[receivedState.PubKey]
-	if found && ch != nil {
-		close(ch)
-		d.changeNotify[receivedState.PubKey] = nil
+	d.notifyPeerListChanged()
+	return nil
+}
+
+func (d *Status) AddPeerStateRoute(peer string, route string) error {
+	d.mux.Lock()
+	defer d.mux.Unlock()
+
+	peerState, ok := d.peers[peer]
+	if !ok {
+		return errors.New("peer doesn't exist")
 	}
 
+	peerState.AddRoute(route)
+	d.peers[peer] = peerState
+
+	// todo: consider to make sense of this notification or not
+	d.notifyPeerListChanged()
+	return nil
+}
+
+func (d *Status) RemovePeerStateRoute(peer string, route string) error {
+	d.mux.Lock()
+	defer d.mux.Unlock()
+
+	peerState, ok := d.peers[peer]
+	if !ok {
+		return errors.New("peer doesn't exist")
+	}
+
+	peerState.DeleteRoute(route)
+	d.peers[peer] = peerState
+
+	// todo: consider to make sense of this notification or not
 	d.notifyPeerListChanged()
 	return nil
 }
@@ -301,12 +325,7 @@ func (d *Status) UpdatePeerICEState(receivedState State) error {
 		return nil
 	}
 
-	ch, found := d.changeNotify[receivedState.PubKey]
-	if found && ch != nil {
-		close(ch)
-		d.changeNotify[receivedState.PubKey] = nil
-	}
-
+	d.notifyPeerStateChangeListeners(receivedState.PubKey)
 	d.notifyPeerListChanged()
 	return nil
 }
@@ -334,12 +353,7 @@ func (d *Status) UpdatePeerRelayedState(receivedState State) error {
 		return nil
 	}
 
-	ch, found := d.changeNotify[receivedState.PubKey]
-	if found && ch != nil {
-		close(ch)
-		d.changeNotify[receivedState.PubKey] = nil
-	}
-
+	d.notifyPeerStateChangeListeners(receivedState.PubKey)
 	d.notifyPeerListChanged()
 	return nil
 }
@@ -366,12 +380,7 @@ func (d *Status) UpdatePeerRelayedStateToDisconnected(receivedState State) error
 		return nil
 	}
 
-	ch, found := d.changeNotify[receivedState.PubKey]
-	if found && ch != nil {
-		close(ch)
-		d.changeNotify[receivedState.PubKey] = nil
-	}
-
+	d.notifyPeerStateChangeListeners(receivedState.PubKey)
 	d.notifyPeerListChanged()
 	return nil
 }
@@ -401,12 +410,7 @@ func (d *Status) UpdatePeerICEStateToDisconnected(receivedState State) error {
 		return nil
 	}
 
-	ch, found := d.changeNotify[receivedState.PubKey]
-	if found && ch != nil {
-		close(ch)
-		d.changeNotify[receivedState.PubKey] = nil
-	}
-
+	d.notifyPeerStateChangeListeners(receivedState.PubKey)
 	d.notifyPeerListChanged()
 	return nil
 }
@@ -477,11 +481,14 @@ func (d *Status) FinishPeerListModifications() {
 func (d *Status) GetPeerStateChangeNotifier(peer string) <-chan struct{} {
 	d.mux.Lock()
 	defer d.mux.Unlock()
+
 	ch, found := d.changeNotify[peer]
-	if !found || ch == nil {
-		ch = make(chan struct{})
-		d.changeNotify[peer] = ch
+	if found {
+		return ch
 	}
+
+	ch = make(chan struct{})
+	d.changeNotify[peer] = ch
 	return ch
 }
 
@@ -755,6 +762,17 @@ func (d *Status) onConnectionChanged() {
 	d.notifier.updateServerStates(d.managementState, d.signalState)
 }
 
+// notifyPeerStateChangeListeners notifies route manager about the change in peer state
+func (d *Status) notifyPeerStateChangeListeners(peerID string) {
+	ch, found := d.changeNotify[peerID]
+	if !found {
+		return
+	}
+
+	close(ch)
+	delete(d.changeNotify, peerID)
+}
+
 func (d *Status) notifyPeerListChanged() {
 	d.notifier.peerListChanged(d.numOfPeers())
 }

client/internal/peer/status_test.go

@@ -93,7 +93,7 @@ func TestGetPeerStateChangeNotifierLogic(t *testing.T) {
 
 	peerState.IP = ip
 
-	err := status.UpdatePeerState(peerState)
+	err := status.UpdatePeerRelayedStateToDisconnected(peerState)
 	assert.NoError(t, err, "shouldn't return error")
 
 	select {

client/internal/peer/worker_ice.go

@@ -57,6 +57,9 @@ type WorkerICE struct {
 
 	localUfrag string
 	localPwd   string
+
+	// we record the last known state of the ICE agent to avoid duplicate on disconnected events
+	lastKnownState ice.ConnectionState
 }
 
 func NewWorkerICE(ctx context.Context, log *log.Entry, config ConnConfig, signaler *Signaler, ifaceDiscover stdnet.ExternalIFaceDiscover, statusRecorder *Status, hasRelayOnLocally bool, callBacks WorkerICECallbacks) (*WorkerICE, error) {
@@ -194,8 +197,7 @@ func (w *WorkerICE) Close() {
 		return
 	}
 
-	err := w.agent.Close()
-	if err != nil {
+	if err := w.agent.Close(); err != nil {
 		w.log.Warnf("failed to close ICE agent: %s", err)
 	}
 }
@@ -215,15 +217,18 @@ func (w *WorkerICE) reCreateAgent(agentCancel context.CancelFunc, candidates []i
 
 	err = agent.OnConnectionStateChange(func(state ice.ConnectionState) {
 		w.log.Debugf("ICE ConnectionState has changed to %s", state.String())
-		if state == ice.ConnectionStateFailed || state == ice.ConnectionStateDisconnected {
-			w.conn.OnStatusChanged(StatusDisconnected)
-
-			w.muxAgent.Lock()
-			agentCancel()
-			_ = agent.Close()
-			w.agent = nil
-
-			w.muxAgent.Unlock()
+		switch state {
+		case ice.ConnectionStateConnected:
+			w.lastKnownState = ice.ConnectionStateConnected
+			return
+		case ice.ConnectionStateFailed, ice.ConnectionStateDisconnected:
+			if w.lastKnownState != ice.ConnectionStateDisconnected {
+				w.lastKnownState = ice.ConnectionStateDisconnected
+				w.conn.OnStatusChanged(StatusDisconnected)
+			}
+			w.closeAgent(agentCancel)
+		default:
+			return
 		}
 	})
 	if err != nil {
@@ -249,6 +254,17 @@ func (w *WorkerICE) reCreateAgent(agentCancel context.CancelFunc, candidates []i
 	return agent, nil
 }
 
+func (w *WorkerICE) closeAgent(cancel context.CancelFunc) {
+	w.muxAgent.Lock()
+	defer w.muxAgent.Unlock()
+
+	cancel()
+	if err := w.agent.Close(); err != nil {
+		w.log.Warnf("failed to close ICE agent: %s", err)
+	}
+	w.agent = nil
+}
+
 func (w *WorkerICE) punchRemoteWGPort(pair *ice.CandidatePair, remoteWgPort int) {
 	// wait local endpoint configuration
 	time.Sleep(time.Second)

client/internal/routemanager/client.go

@@ -122,13 +122,20 @@ func (c *clientNetwork) getBestRouteFromStatuses(routePeerStatuses map[route.ID]
 			tempScore = float64(metricDiff) * 10
 		}
 
-		// in some temporal cases, latency can be 0, so we set it to 1s to not block but try to avoid this route
-		latency := time.Second
+		// in some temporal cases, latency can be 0, so we set it to 999ms to not block but try to avoid this route
+		latency := 999 * time.Millisecond
 		if peerStatus.latency != 0 {
 			latency = peerStatus.latency
 		} else {
-			log.Warnf("peer %s has 0 latency", r.Peer)
+			log.Tracef("peer %s has 0 latency, range %s", r.Peer, c.handler)
 		}
+
+		// avoid negative tempScore on the higher latency calculation
+		if latency > 1*time.Second {
+			latency = 999 * time.Millisecond
+		}
+
+		// higher latency is worse score
 		tempScore += 1 - latency.Seconds()
 
 		if !peerStatus.relayed {
@@ -150,6 +157,8 @@ func (c *clientNetwork) getBestRouteFromStatuses(routePeerStatuses map[route.ID]
 		}
 	}
 
+	log.Debugf("chosen route: %s, chosen score: %f, current route: %s, current score: %f", chosen, chosenScore, currID, currScore)
+
 	switch {
 	case chosen == "":
 		var peers []string
@@ -195,15 +204,20 @@ func (c *clientNetwork) watchPeerStatusChanges(ctx context.Context, peerKey stri
 func (c *clientNetwork) startPeersStatusChangeWatcher() {
 	for _, r := range c.routes {
 		_, found := c.routePeersNotifiers[r.Peer]
-		if !found {
-			c.routePeersNotifiers[r.Peer] = make(chan struct{})
-			go c.watchPeerStatusChanges(c.ctx, r.Peer, c.peerStateUpdate, c.routePeersNotifiers[r.Peer])
+		if found {
+			continue
 		}
+
+		closerChan := make(chan struct{})
+		c.routePeersNotifiers[r.Peer] = closerChan
+		go c.watchPeerStatusChanges(c.ctx, r.Peer, c.peerStateUpdate, closerChan)
 	}
 }
 
-func (c *clientNetwork) removeRouteFromWireguardPeer() error {
-	c.removeStateRoute()
+func (c *clientNetwork) removeRouteFromWireGuardPeer() error {
+	if err := c.statusRecorder.RemovePeerStateRoute(c.currentChosen.Peer, c.handler.String()); err != nil {
+		log.Warnf("Failed to update peer state: %v", err)
+	}
 
 	if err := c.handler.RemoveAllowedIPs(); err != nil {
 		return fmt.Errorf("remove allowed IPs: %w", err)
@@ -218,7 +232,7 @@ func (c *clientNetwork) removeRouteFromPeerAndSystem() error {
 
 	var merr *multierror.Error
 
-	if err := c.removeRouteFromWireguardPeer(); err != nil {
+	if err := c.removeRouteFromWireGuardPeer(); err != nil {
 		merr = multierror.Append(merr, fmt.Errorf("remove allowed IPs for peer %s: %w", c.currentChosen.Peer, err))
 	}
 	if err := c.handler.RemoveRoute(); err != nil {
@@ -257,7 +271,7 @@ func (c *clientNetwork) recalculateRouteAndUpdatePeerAndSystem() error {
 		}
 	} else {
 		// Otherwise, remove the allowed IPs from the previous peer first
-		if err := c.removeRouteFromWireguardPeer(); err != nil {
+		if err := c.removeRouteFromWireGuardPeer(); err != nil {
 			return fmt.Errorf("remove allowed IPs for peer %s: %w", c.currentChosen.Peer, err)
 		}
 	}
@@ -268,37 +282,13 @@ func (c *clientNetwork) recalculateRouteAndUpdatePeerAndSystem() error {
 		return fmt.Errorf("add allowed IPs for peer %s: %w", c.currentChosen.Peer, err)
 	}
 
-	c.addStateRoute()
-
+	err := c.statusRecorder.AddPeerStateRoute(c.currentChosen.Peer, c.handler.String())
+	if err != nil {
+		return fmt.Errorf("add peer state route: %w", err)
+	}
 	return nil
 }
 
-func (c *clientNetwork) addStateRoute() {
-	state, err := c.statusRecorder.GetPeer(c.currentChosen.Peer)
-	if err != nil {
-		log.Errorf("Failed to get peer state: %v", err)
-		return
-	}
-
-	state.AddRoute(c.handler.String())
-	if err := c.statusRecorder.UpdatePeerState(state); err != nil {
-		log.Warnf("Failed to update peer state: %v", err)
-	}
-}
-
-func (c *clientNetwork) removeStateRoute() {
-	state, err := c.statusRecorder.GetPeer(c.currentChosen.Peer)
-	if err != nil {
-		log.Errorf("Failed to get peer state: %v", err)
-		return
-	}
-
-	state.DeleteRoute(c.handler.String())
-	if err := c.statusRecorder.UpdatePeerState(state); err != nil {
-		log.Warnf("Failed to update peer state: %v", err)
-	}
-}
-
 func (c *clientNetwork) sendUpdateToClientNetworkWatcher(update routesUpdate) {
 	go func() {
 		c.routeUpdate <- update

client/internal/routemanager/refcounter/refcounter.go

@@ -217,6 +217,11 @@ func (rm *Counter[Key, I, O]) Clear() {
 
 // MarshalJSON implements the json.Marshaler interface for Counter.
 func (rm *Counter[Key, I, O]) MarshalJSON() ([]byte, error) {
+	rm.refCountMu.Lock()
+	defer rm.refCountMu.Unlock()
+	rm.idMu.Lock()
+	defer rm.idMu.Unlock()
+
 	return json.Marshal(struct {
 		RefCountMap map[Key]Ref[O]   `json:"refCountMap"`
 		IDMap       map[string][]Key `json:"idMap"`

management/server/grpcserver.go

@@ -6,6 +6,7 @@ import (
 	"net"
 	"net/netip"
 	"strings"
+	"sync"
 	"time"
 
 	pb "github.com/golang/protobuf/proto" // nolint
@@ -38,6 +39,7 @@ type GRPCServer struct {
 	jwtClaimsExtractor *jwtclaims.ClaimsExtractor
 	appMetrics         telemetry.AppMetrics
 	ephemeralManager   *EphemeralManager
+	peerLocks          sync.Map
 }
 
 // NewServer creates a new Management server
@@ -148,6 +150,13 @@ func (s *GRPCServer) Sync(req *proto.EncryptedMessage, srv proto.ManagementServi
 	// nolint:staticcheck
 	ctx = context.WithValue(ctx, nbContext.PeerIDKey, peerKey.String())
 
+	unlock := s.acquirePeerLockByUID(ctx, peerKey.String())
+	defer func() {
+		if unlock != nil {
+			unlock()
+		}
+	}()
+
 	accountID, err := s.accountManager.GetAccountIDForPeerKey(ctx, peerKey.String())
 	if err != nil {
 		// nolint:staticcheck
@@ -190,6 +199,9 @@ func (s *GRPCServer) Sync(req *proto.EncryptedMessage, srv proto.ManagementServi
 		s.appMetrics.GRPCMetrics().CountSyncRequestDuration(time.Since(reqStart))
 	}
 
+	unlock()
+	unlock = nil
+
 	return s.handleUpdates(ctx, accountID, peerKey, peer, updates, srv)
 }
 
@@ -245,9 +257,12 @@ func (s *GRPCServer) sendUpdate(ctx context.Context, accountID string, peerKey w
 }
 
 func (s *GRPCServer) cancelPeerRoutines(ctx context.Context, accountID string, peer *nbpeer.Peer) {
+	unlock := s.acquirePeerLockByUID(ctx, peer.Key)
+	defer unlock()
+
+	_ = s.accountManager.OnPeerDisconnected(ctx, accountID, peer.Key)
 	s.peersUpdateManager.CloseChannel(ctx, peer.ID)
 	s.secretsManager.CancelRefresh(peer.ID)
-	_ = s.accountManager.OnPeerDisconnected(ctx, accountID, peer.Key)
 	s.ephemeralManager.OnPeerDisconnected(ctx, peer)
 }
 
@@ -274,6 +289,24 @@ func (s *GRPCServer) validateToken(ctx context.Context, jwtToken string) (string
 	return claims.UserId, nil
 }
 
+func (s *GRPCServer) acquirePeerLockByUID(ctx context.Context, uniqueID string) (unlock func()) {
+	log.WithContext(ctx).Tracef("acquiring peer lock for ID %s", uniqueID)
+
+	start := time.Now()
+	value, _ := s.peerLocks.LoadOrStore(uniqueID, &sync.RWMutex{})
+	mtx := value.(*sync.RWMutex)
+	mtx.Lock()
+	log.WithContext(ctx).Tracef("acquired peer lock for ID %s in %v", uniqueID, time.Since(start))
+	start = time.Now()
+
+	unlock = func() {
+		mtx.Unlock()
+		log.WithContext(ctx).Tracef("released peer lock for ID %s in %v", uniqueID, time.Since(start))
+	}
+
+	return unlock
+}
+
 // maps internal internalStatus.Error to gRPC status.Error
 func mapError(ctx context.Context, err error) error {
 	if e, ok := internalStatus.FromError(err); ok {

management/server/http/routes_handler.go

@@ -149,7 +149,7 @@ func (h *RoutesHandler) validateRoute(req api.PostApiRoutesJSONRequestBody) erro
 	}
 
 	if req.Peer == nil && req.PeerGroups == nil {
-		return status.Errorf(status.InvalidArgument, "either 'peer' or 'peers_group' should be provided")
+		return status.Errorf(status.InvalidArgument, "either 'peer' or 'peer_groups' should be provided")
 	}
 
 	if req.Peer != nil && req.PeerGroups != nil {

relay/client/client.go

@@ -3,7 +3,6 @@ package client
 import (
 	"context"
 	"fmt"
-	"io"
 	"net"
 	"sync"
 	"time"
@@ -449,11 +448,11 @@ func (c *Client) writeTo(connReference *Conn, id string, dstID []byte, payload [
 	conn, ok := c.conns[id]
 	c.mu.Unlock()
 	if !ok {
-		return 0, io.EOF
+		return 0, net.ErrClosed
 	}
 
 	if conn.conn != connReference {
-		return 0, io.EOF
+		return 0, net.ErrClosed
 	}
 
 	// todo: use buffer pool instead of create new transport msg.
@@ -508,7 +507,7 @@ func (c *Client) closeConn(connReference *Conn, id string) error {
 
 	container, ok := c.conns[id]
 	if !ok {
-		return fmt.Errorf("connection already closed")
+		return net.ErrClosed
 	}
 
 	if container.conn != connReference {

relay/client/conn.go

@@ -1,7 +1,6 @@
 package client
 
 import (
-	"io"
 	"net"
 	"time"
 )
@@ -40,7 +39,7 @@ func (c *Conn) Write(p []byte) (n int, err error) {
 func (c *Conn) Read(b []byte) (n int, err error) {
 	msg, ok := <-c.messageChan
 	if !ok {
-		return 0, io.EOF
+		return 0, net.ErrClosed
 	}
 
 	n = copy(b, msg.Payload)

relay/server/listener/ws/conn.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"errors"
 	"fmt"
-	"io"
 	"net"
 	"sync"
 	"time"
@@ -100,7 +99,7 @@ func (c *Conn) isClosed() bool {
 
 func (c *Conn) ioErrHandling(err error) error {
 	if c.isClosed() {
-		return io.EOF
+		return net.ErrClosed
 	}
 
 	var wErr *websocket.CloseError
@@ -108,7 +107,7 @@ func (c *Conn) ioErrHandling(err error) error {
 		return err
 	}
 	if wErr.Code == websocket.StatusNormalClosure {
-		return io.EOF
+		return net.ErrClosed
 	}
 	return err
 }

relay/server/peer.go

@@ -2,7 +2,7 @@ package server
 
 import (
 	"context"
-	"io"
+	"errors"
 	"net"
 	"sync"
 	"time"
@@ -57,7 +57,7 @@ func (p *Peer) Work() {
 	for {
 		n, err := p.conn.Read(buf)
 		if err != nil {
-			if err != io.EOF {
+			if !errors.Is(err, net.ErrClosed) {
 				p.log.Errorf("failed to read message: %s", err)
 			}
 			return