tags: libp2p,Starcoin Web3 StarTrek source: https://docs.rs/libp2p/0.45.1/libp2p/tutorials/index.html Ping: Four necessary traits Identity: PeerId and corresponding Keypair Transport: send and receive bytes on the network. NetworkBehaviour: decode or encode the bytes from the Transport. Swarm: drives both a Transport and a NetworkBehaviour forward. use futures::StreamExt; use libp2p::ping::{Ping, PingConfig}; use libp2p::{identity, Multiaddr, PeerId, Swarm}; use std::error::Error; #[async_std::main] async fn main() -> Result<(), Box<dyn Error>> { // First we need to create a network identity. let local_key = identity::Keypair::generate_ed25519(); let local_peer_id = PeerId::from(local_key.public()); println!("Local peer id: {:?}", local_peer_id); // Then construct a transport: defines how to send bytes on the network. let transport = libp2p::development_transport(local_key).await?; // NetworkBehaviour defines what bytes to send on the network. let behaviour = Ping::new(PingConfig::new().with_keep_alive(true)); // Swarm connects transport and behaviour together: // // 1. Passing commands from NetworkBehaviour to the Transport. // 2. As well ass events from the Transport to the NetworkBehaviour. let mut swarm = Swarm::new(transport, behaviour, local_peer_id); swarm.listen_on("/ip4/0.0.0.0/tcp/0".parse()?)?; if let Some(addr) = std::env::args().nth(1) { let remote: Multiaddr = addr.parse()?; swarm.dial(remote)?; println!("Dialed {}", addr); } loop { match swarm.select_next_some().await { libp2p::swarm::SwarmEvent::NewListenAddr { listener_id: _, address, } => println!("Listening on {:?}", address), libp2p::swarm::SwarmEvent::Behaviour(event) => println!("{:?}", event), _ => {} } } Ok(()) }