远程设计功能性优化

sequenceDiagram
	client->>server: connect, current infos
	server->>status: add connection, store infos
	client->>server: disconnect
	server->>status: remove connection, clear infos

	client->>server: rpc
	server->>server: check connection exist
	server->>status: get connection
	status->>server: return connection
	alt exist
		 server->>client: rpc success
	else not exist
		 server->>client: rpc failed, due to connection is not exist
		 client->>server: connect, current infos
	end