fix[cache]: do not close session whe tunnel is exception

net/src/main/java/com/zfoo/net/core/proxy/handler/TunnelClientRouteHandler.java

@@ -57,4 +57,8 @@ public class TunnelClientRouteHandler extends BaseRouteHandler {
         NetContext.getRouter().receive(session, tunnelPacketInfo.packet, tunnelPacketInfo.attachment);
     }
 
+    @Override
+    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
+        logger.error("{} session exception:[{}]", SessionUtils.sessionSimpleInfo(ctx), cause.getMessage());
+    }
 }

net/src/main/java/com/zfoo/net/core/proxy/handler/TunnelServerRouteHandler.java

@@ -44,4 +44,9 @@ public class TunnelServerRouteHandler extends BaseRouteHandler {
         TunnelServer.tunnels.remove(ctx.channel());
         logger.warn("tunnel server channel is inactive {}", SessionUtils.sessionSimpleInfo(ctx));
     }
+
+    @Override
+    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
+        logger.error("{} session exception:[{}]", SessionUtils.sessionSimpleInfo(ctx), cause.getMessage());
+    }
 }