0g-storage-node/version-meld/discv5/examples/request_enr.rs

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2024-01-03 10:24:52 +00:00
//! Creates a Discv5 Server and requests an ENR of a node given a multiaddr.
//!
//! This is a simple example of how one may connect to a Discv5 peer using a multiaddr/multiaddr
//! string.
//!
//! To run this example execute the following command from the root directory:
//! ```bash
//! $ cargo run --example request_enr <MULTIADDR>
//! ```
//!
//! The <MULTIADDR> value should be the string form of a multiaddr including the p2p protocol.
//! Currently only secp256k1 and ed25519 keys are supported.
//!
//! This requires the "libp2p" feature.
#[cfg(feature = "libp2p")]
use discv5::{enr, enr::CombinedKey, Discv5, Discv5Config};
#[cfg(feature = "libp2p")]
use std::net::SocketAddr;
#[cfg(not(feature = "libp2p"))]
fn main() {}
#[cfg(feature = "libp2p")]
#[tokio::main]
async fn main() {
let filter_layer = tracing_subscriber::EnvFilter::try_from_default_env()
.or_else(|_| tracing_subscriber::EnvFilter::try_new("info"))
.unwrap();
let _ = tracing_subscriber::fmt()
.with_env_filter(filter_layer)
.try_init();
// listening address and port
let listen_addr = "0.0.0.0:9000".parse::<SocketAddr>().unwrap();
// generate a new enr key
let enr_key = CombinedKey::generate_secp256k1();
// construct a local ENR
let enr = enr::EnrBuilder::new("v4").build(&enr_key).unwrap();
// default discv5 configuration
let config = Discv5Config::default();
let multiaddr = std::env::args()
.nth(1)
.expect("A multiaddr must be supplied");
// construct the discv5 server
let mut discv5 = Discv5::new(enr, enr_key, config).unwrap();
// start the discv5 service
discv5.start(listen_addr).await.unwrap();
// search for the ENR
match discv5.request_enr(multiaddr).await {
Ok(enr) => {
println!("ENR Found:");
println!("Base64:{}", enr.to_base64());
println!("{}", enr);
}
Err(e) => {
println!("Error:{:?}", e);
}
}
}