p2p

kona-p2p

A p2p library for the OP Stack.

Contains a gossipsub driver to run discv5 peer discovery and block gossip.

Example

Warning

Notice, the socket address uses 0.0.0.0. If you are experiencing issues connecting to peers for discovery, check to make sure you are not using the loopback address, 127.0.0.1 aka "localhost", which can prevent outward facing connections.

use std::net::{IpAddr, Ipv4Addr, SocketAddr};
use alloy_primitives::address;
use kona_p2p::{LocalNode, Network};
use libp2p::Multiaddr;
use discv5::enr::CombinedKey;

// Construct the Network
let signer = address!("bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb");
let gossip = SocketAddr::new(IpAddr::V4(Ipv4Addr::UNSPECIFIED), 9099);
let mut gossip_addr = Multiaddr::from(gossip.ip());
gossip_addr.push(libp2p::multiaddr::Protocol::Tcp(gossip.port()));
let advertise_ip = IpAddr::V4(Ipv4Addr::UNSPECIFIED);

let CombinedKey::Secp256k1(k256_key) = CombinedKey::generate_secp256k1() else {
    unreachable!()
};
let disc = LocalNode::new(k256_key, advertise_ip, 9097, 9098);
let network = Network::builder()
    .with_chain_id(10) // op mainnet chain id
    .with_unsafe_block_signer(signer)
    .with_discovery_address(disc)
    .with_gossip_address(gossip_addr)
    .build()
    .expect("Failed to builder network driver");

// Starting the network spawns gossip and discovery service
// handling in a new thread so this is a non-blocking,
// synchronous operation that does not need to be awaited.
network.start().expect("Failed to start network driver");

Acknowledgements

Largely based off magi's p2p module.