fix(conn): fix deadlock.

Fixes: #179

utils/connection.go

@@ -21,11 +21,15 @@ var ErrConnectionClosed = errors.New("connection closed")
 // PlannedDisconnect 预料中的断开连接
 // 如调用 Close() Connect()
 func (t *TCPListener) PlannedDisconnect(f func(*TCPListener)) {
+	t.lock.Lock()
+	defer t.lock.Unlock()
 	t.plannedDisconnect = f
 }
 
 // UnexpectedDisconnect 未预料钟的断开连接
 func (t *TCPListener) UnexpectedDisconnect(f func(*TCPListener, error)) {
+	t.lock.Lock()
+	defer t.lock.Unlock()
 	t.unexpectedDisconnect = f
 }
 
@@ -42,30 +46,30 @@ func (t *TCPListener) Connect(addr *net.TCPAddr) error {
 }
 
 func (t *TCPListener) Write(buf []byte) error {
-	err := t.rLockDo(func() error {
-		_, e := t.conn.Write(buf)
-		return e
-	})
-	if err == nil {
+	if conn := t.getConn(); conn != nil {
+		_, err := conn.Write(buf)
+		if err != nil {
+			t.unexpectedClose(err)
+			return ErrConnectionClosed
+		}
 		return nil
 	}
 
-	t.unexpectedClose(err)
 	return ErrConnectionClosed
 }
 
 func (t *TCPListener) ReadBytes(len int) ([]byte, error) {
 	buf := make([]byte, len)
-	err := t.rLockDo(func() error {
-		_, e := io.ReadFull(t.conn, buf)
-		return e
-	})
-	if err == nil {
+	if conn := t.getConn(); conn != nil {
+		_, err := io.ReadFull(conn, buf)
+		if err != nil {
+			// time.Sleep(time.Millisecond * 100) // 服务器会发送offline包后立即断开连接, 此时还没解析, 可能还是得加锁
+			t.unexpectedClose(err)
+			return nil, ErrConnectionClosed
+		}
 		return buf, nil
 	}
 
-	//time.Sleep(time.Millisecond * 100) // 服务器会发送offline包后立即断开连接, 此时还没解析, 可能还是得加锁
-	t.unexpectedClose(err)
 	return nil, ErrConnectionClosed
 }
 
@@ -78,18 +82,14 @@ func (t *TCPListener) ReadInt32() (int32, error) {
 }
 
 func (t *TCPListener) Close() {
-	if !t.connIsNil() {
 	t.close()
 	t.invokePlannedDisconnect()
 }
-}
 
 func (t *TCPListener) unexpectedClose(err error) {
-	if !t.connIsNil() {
 	t.close()
 	t.invokeUnexpectedDisconnect(err)
 }
-}
 
 func (t *TCPListener) close() {
 	t.lock.Lock()
@@ -101,28 +101,23 @@ func (t *TCPListener) close() {
 }
 
 func (t *TCPListener) invokePlannedDisconnect() {
+	t.lock.RLock()
+	defer t.lock.RUnlock()
 	if t.plannedDisconnect != nil {
 		go t.plannedDisconnect(t)
 	}
 }
 
 func (t *TCPListener) invokeUnexpectedDisconnect(err error) {
+	t.lock.RLock()
+	defer t.lock.RUnlock()
 	if t.unexpectedDisconnect != nil {
 		go t.unexpectedDisconnect(t, err)
 	}
 }
 
-func (t *TCPListener) rLockDo(fn func() error) error {
+func (t *TCPListener) getConn() net.Conn {
 	t.lock.RLock()
 	defer t.lock.RUnlock()
-	if t.conn == nil {
-		return ErrConnectionClosed
-	}
-	return fn()
-}
-
-func (t *TCPListener) connIsNil() bool {
-	t.lock.RLock()
-	defer t.lock.RUnlock()
-	return t.conn == nil
+	return t.conn
 }