instytutxr / openp2p

Peer-to-Peer game networking library for thousands of players simultaneously. Work in Progress

OpenP2P

Peer-to-Peer networking library for thousands of players simulatenously.

Design

Networking Core Design

NetworkClient/NetworkServer 

  -> NetworkProtocol 
  
    -> NetworkSocket
    
      -> NetworkThread
      
    -> NetworkChannel
    
      -> NetworkPacket
      
        ->NetworkMessage

Message System

NetworkChannel defines the types of messages that can be created. NetworkMessage derived classes perform the serialization into the packet buffer. You create a message, configure the message variables, then send a ReliableMessage, Message, or Response. ReliableMessage will expect a Response type message from their target endpoint. Message and Response are unreliable messages.

In future NetworkPeer and NetworkPeerGroup will allow stacking messages into a single packet, when possible.

NetworkMessage header encodes 5 bytes for ChannelType (up to 16 channels, 4 bits), SendType (Message/Response 1 bit), Reliable (yes/no 1 bit), Redirect (1 bit + 2 bytes for user id), Message Owner ID (2 bytes), Message Sequence (2 bytes).

Event System

Current event system allows hooking into the NetworkChannelEvents OnMessage and OnResponse for when a NetworkMessage is received. There are also low level NetworkSocket events OnSend and OnReceive, for further customization.

Multi-threaded

Send, Receive, and Receive Processing are the 3 sub threads on top of main thread.

Goals

Build P2P system that can send reliable and unreliable messages, and connect users via a position based topology. The end goal is to support 1,000 + real-time players on a single server.