Open.P2P is a lightweight and easy-to-use class library to develop peer-to-peer applications in .NET and Mono. Programming with sockets, and using tcp as communication protocol in particular, introduces some complexites which can be abstracted away.

The main goal is to simplify communication amoung computers abstracting away most of the complexities developers find when develop with sockets, providing a clean and easy interface to connect, disconnect, send and receive data to/from peers.

A simple Echo service that once received a message, sends it back.

var listener = new Listener(9988);
var comManager = new CommunicationManager(_listener);

comManager.PeerConnected += (s, e)=> {
    using(var sr = new StreamReader(e.Peer.Stream))
	{
		using(var sw = new StreamWriter(e.Peer.Stream))
		{
			var read = sr.Read(buf, 0, buf.Length)
			while(read > 0)
			{
				sw.Write(buf, 0, read);
				read = sr.Read(buf, 0, buf.Length);
			}
		}
	}
};
listener.Start();

The main functionality is available trought the CommunicationManager class and its four methods: Connect, Disconnect, Send and Receive.

Other goals are:

• Avoid multi-threading. It uses a single thread approach to handle all the asynchronous operations and queue the communications' results in a independent queue for processing.
• Reduce memory fragmentation: It implements its own buffer allocation mecanism to help the garbage collector to deal with pinned memory.
• Low-memory usage. Internally, pooled objects and pre-allocated buffers are used to reduce the memory requirements.
• Low-grained bandwidth control. It allows to control the individual peer's upload and download rates.

Open.P2P is developed by Lucas Ontivero (@lontivero). You are welcome to contribute code. You can send code both as a patch or a GitHub pull request.

Note that Peer2Net is still very much work in progress.