fixed issue #483 , show slave hosts

driver/src/main/java/com/alibaba/otter/canal/parse/driver/mysql/socket/BioSocketChannel.java

@@ -138,6 +138,16 @@ public class BioSocketChannel implements SocketChannel {
         if (socket != null) {
             return socket.getRemoteSocketAddress();
         }
+
+        return null;
+    }
+
+    public SocketAddress getLocalSocketAddress() {
+        Socket socket = this.socket;
+        if (socket != null) {
+            return socket.getLocalSocketAddress();
+        }
+
         return null;
     }
 

driver/src/main/java/com/alibaba/otter/canal/parse/driver/mysql/socket/NettySocketChannel.java

@@ -216,6 +216,10 @@ public class NettySocketChannel implements SocketChannel {
         return channel != null ? channel.remoteAddress() : null;
     }
 
+    public SocketAddress getLocalSocketAddress() {
+        return channel != null ? channel.localAddress() : null;
+    }
+
     public void close() {
         if (channel != null) {
             channel.close();

driver/src/main/java/com/alibaba/otter/canal/parse/driver/mysql/socket/SocketChannel.java

@@ -21,5 +21,7 @@ public interface SocketChannel {
 
     public SocketAddress getRemoteSocketAddress();
 
+    public SocketAddress getLocalSocketAddress();
+
     public void close();
 }