Use a sync.Once in Conn.Close

p2p/transport/websocket/conn_browser.go

@@ -33,6 +33,7 @@ type Conn struct {
 	currDataMut     sync.RWMutex
 	currData        bytes.Buffer
 	closeOnce       sync.Once
+	closeSignalOnce sync.Once
 	closeSignal     chan struct{}
 	dataSignal      chan struct{}
 	localAddr       net.Addr
@@ -126,14 +127,16 @@ func (c *Conn) Write(b []byte) (n int, err error) {
 // close error, subsequent and concurrent calls will return nil.
 // This method is thread-safe.
 func (c *Conn) Close() error {
+	c.closeOnce.Do(func() {
 		c.signalClose()
 		c.Call("close")
 		c.releaseHandlers()
+	})
 	return nil
 }
 
 func (c *Conn) signalClose() {
-	c.closeOnce.Do(func() {
+	c.closeSignalOnce.Do(func() {
 		close(c.closeSignal)
 	})
 }