PeerNet

Some drafts on the implementation of massalabs/massa#3149

Still early implementation (WIP).

Usage:

    // Generating a keypair for the first peer
    let keypair1 = KeyPair::generate();
    // Setup configuration for the first peer
    let config = PeerNetConfiguration {
        max_in_connections: 10,
        max_out_connections: 20,
        peer_id: PeerId::from_public_key(keypair1.get_public_key()),
        initial_peer_list: Vec::new(),
    };
    // Setup the manager for the first peer
    let mut manager = PeerNetManager::new(config);
    // Setup the listener for the TCP transport to 8081 port.
    manager
        .start_listener(TransportType::Tcp, "127.0.0.1:8081".parse().unwrap())
        .unwrap();

    // Generating a keypair for the second peer
    let keypair2 = KeyPair::generate();
    // Setup configuration for the second peer
    let config = PeerNetConfiguration {
        max_in_connections: 10,
        max_out_connections: 20,
        peer_id: PeerId::from_public_key(keypair2.get_public_key()),
        initial_peer_list: Vec::new(),
    };
    // Setup the manager for the second peer
    let mut manager2 = PeerNetManager::new(config);
    // Try to connect to the first peer listener on TCP port 8081.
    manager2
        .try_connect(
            "127.0.0.1:8081".parse().unwrap(),
            Duration::from_secs(3),
            &mut OutConnectionConfig::Tcp(()),
        )
        .unwrap();
    std::thread::sleep(std::time::Duration::from_secs(3));
    // Close the listener of the first peer
    manager
        .stop_listener(TransportType::Tcp, "127.0.0.1:8081".parse().unwrap())
        .unwrap();