各个数据结构：

Common_Struct

// used to parse incoming packet for for command , so as a repective command command could be triggered

Handshake_Struct

// at start, client sends handshake and server will respond to handshake

Peer_Info

Sync_Struct

Chain_Request_Struct

Chain_Response_Struct

Object_Request_Struct

Object_Response_struct

Complete_Block

Notify_New_Objects_Struct