disco: remove unused code

disco/udp.go

@@ -31,7 +31,6 @@ type UDPConfig struct {
 	DisableIPv4           bool
 	DisableIPv6           bool
 	ID                    peer.ID
-	NetworkDetectInterval time.Duration
 	PeerKeepaliveInterval time.Duration
 	DiscoMagic            func() []byte
 }
@@ -503,9 +502,6 @@ func ListenUDP(cfg UDPConfig) (*UDPConn, error) {
 	if cfg.ID.Len() == 0 {
 		return nil, errors.New("peer id is required")
 	}
-	if cfg.NetworkDetectInterval < time.Second {
-		cfg.NetworkDetectInterval = 5 * time.Second
-	}
 	if cfg.PeerKeepaliveInterval < time.Second {
 		cfg.PeerKeepaliveInterval = 10 * time.Second
 	}

p2p/conn.go

@@ -99,10 +99,7 @@ func (c *PeerPacketConn) Close() error {
 	if err := c.udpConn.Close(); err != nil {
 		errs = append(errs, err)
 	}
-	if len(errs) > 0 {
-		return errors.Join(errs...)
-	}
-	return nil
+	return errors.Join(errs...)
 }
 
 // LocalAddr returns the local network address, if known.
@@ -214,6 +211,7 @@ func (c *PeerPacketConn) SharedKey(peerID peer.ID) ([]byte, error) {
 	return c.cfg.SymmAlgo.SecretKey()(peerID.String())
 }
 
+// runAddrUpdateEventLoop listen network change and restart udp and websocket listener
 func (c *PeerPacketConn) runAddrUpdateEventLoop() {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()