Fix gnet.Conn not compatible with net.Conn on method Close having typ…

…e func() error and change Close(AsyncCallback) to CloseWithCallback(AsyncCallback)

client.go

@@ -214,7 +214,7 @@ func (cli *Client) Dial(network, address string) (Conn, error) {
 	}
 	err = cli.el.poller.UrgentTrigger(cli.el.register, gc)
 	if err != nil {
-		gc.Close(nil)
+		gc.Close()
 		return nil, err
 	}
 	return gc, nil

client_test.go

@@ -315,7 +315,7 @@ func startGnetClient(t *testing.T, cli *Client, ev *clientEvents, network, addr
 	rand.Seed(time.Now().UnixNano())
 	c, err := cli.Dial(network, addr)
 	require.NoError(t, err)
-	defer c.Close(nil)
+	defer c.Close()
 	var rspCh chan []byte
 	if network == "udp" {
 		rspCh = make(chan []byte, 1)

connection.go

@@ -442,7 +442,7 @@ func (c *conn) Wake(callback AsyncCallback) error {
 	}, nil)
 }
 
-func (c *conn) Close(callback AsyncCallback) error {
+func (c *conn) CloseWithCallback(callback AsyncCallback) error {
 	return c.loop.poller.Trigger(func(_ interface{}) (err error) {
 		err = c.loop.closeConn(c, nil)
 		if callback != nil {
@@ -451,3 +451,10 @@ func (c *conn) Close(callback AsyncCallback) error {
 		return
 	}, nil)
 }
+
+func (c *conn) Close() error {
+	return c.loop.poller.Trigger(func(_ interface{}) (err error) {
+		err = c.loop.closeConn(c, nil)
+		return
+	}, nil)
+}

gnet.go

@@ -227,7 +227,10 @@ type Conn interface {
 
 	// Close closes the current connection, usually you don't need to pass a non-nil callback
 	// because you should use OnClose() instead, the callback here is only for compatibility.
-	Close(callback AsyncCallback) (err error)
+	CloseWithCallback(callback AsyncCallback) (err error)
+
+	// Close closes the current connection, implements net.Conn.
+	Close() (err error)
 }
 
 type (

gnet_test.go

@@ -834,7 +834,7 @@ func (t *testCloseConnectionServer) OnTraffic(c Conn) (action Action) {
 	_, _ = c.Discard(-1)
 	go func() {
 		time.Sleep(time.Second)
-		_ = c.Close(nil)
+		_ = c.Close()
 	}()
 	return
 }
@@ -983,7 +983,7 @@ func (s *testClosedWakeUpServer) OnTraffic(c Conn) Action {
 	}
 
 	go func() { require.NoError(s.tester, c.Wake(nil)) }()
-	go func() { require.NoError(s.tester, c.Close(nil)) }()
+	go func() { require.NoError(s.tester, c.Close()) }()
 
 	<-s.clientClosed