#![cfg(test)] use eth2_libp2p::Enr; use eth2_libp2p::EnrExt; use eth2_libp2p::Multiaddr; use eth2_libp2p::Service as LibP2PService; use eth2_libp2p::{Libp2pEvent, NetworkConfig}; use libp2p::gossipsub::GossipsubConfigBuilder; use slog::{debug, error, o, Drain}; use std::net::{TcpListener, UdpSocket}; use std::sync::Arc; use std::sync::Weak; use std::time::Duration; use tokio::runtime::Runtime; use types::{ChainSpec, EnrForkId, ForkContext, Hash256, MinimalEthSpec}; type E = MinimalEthSpec; use tempfile::Builder as TempBuilder; /// Returns a dummy fork context fn fork_context() -> ForkContext { ForkContext::new::(types::Slot::new(0), Hash256::zero(), &ChainSpec::minimal()) } pub struct Libp2pInstance(LibP2PService, exit_future::Signal); impl std::ops::Deref for Libp2pInstance { type Target = LibP2PService; fn deref(&self) -> &Self::Target { &self.0 } } impl std::ops::DerefMut for Libp2pInstance { fn deref_mut(&mut self) -> &mut Self::Target { &mut self.0 } } pub fn build_log(level: slog::Level, enabled: bool) -> slog::Logger { let decorator = slog_term::TermDecorator::new().build(); let drain = slog_term::FullFormat::new(decorator).build().fuse(); let drain = slog_async::Async::new(drain).build().fuse(); if enabled { slog::Logger::root(drain.filter_level(level).fuse(), o!()) } else { slog::Logger::root(drain.filter(|_| false).fuse(), o!()) } } // A bit of hack to find an unused port. /// /// Does not guarantee that the given port is unused after the function exits, just that it was /// unused before the function started (i.e., it does not reserve a port). pub fn unused_port(transport: &str) -> Result { let local_addr = match transport { "tcp" => { let listener = TcpListener::bind("127.0.0.1:0").map_err(|e| { format!("Failed to create TCP listener to find unused port: {:?}", e) })?; listener.local_addr().map_err(|e| { format!( "Failed to read TCP listener local_addr to find unused port: {:?}", e ) })? } "udp" => { let socket = UdpSocket::bind("127.0.0.1:0") .map_err(|e| format!("Failed to create UDP socket to find unused port: {:?}", e))?; socket.local_addr().map_err(|e| { format!( "Failed to read UDP socket local_addr to find unused port: {:?}", e ) })? } _ => return Err("Invalid transport to find unused port".into()), }; Ok(local_addr.port()) } pub fn build_config(port: u16, mut boot_nodes: Vec) -> NetworkConfig { let mut config = NetworkConfig::default(); let path = TempBuilder::new() .prefix(&format!("libp2p_test{}", port)) .tempdir() .unwrap(); config.libp2p_port = port; // tcp port config.discovery_port = port; // udp port config.enr_tcp_port = Some(port); config.enr_udp_port = Some(port); config.enr_address = Some("127.0.0.1".parse().unwrap()); config.boot_nodes_enr.append(&mut boot_nodes); config.network_dir = path.into_path(); // Reduce gossipsub heartbeat parameters config.gs_config = GossipsubConfigBuilder::from(config.gs_config) .heartbeat_initial_delay(Duration::from_millis(500)) .heartbeat_interval(Duration::from_millis(500)) .build() .unwrap(); config } pub async fn build_libp2p_instance( rt: Weak, boot_nodes: Vec, log: slog::Logger, ) -> Libp2pInstance { let port = unused_port("tcp").unwrap(); let config = build_config(port, boot_nodes); // launch libp2p service let (signal, exit) = exit_future::signal(); let (shutdown_tx, _) = futures::channel::mpsc::channel(1); let executor = task_executor::TaskExecutor::new(rt, exit, log.clone(), shutdown_tx); let fork_context = Arc::new(fork_context()); Libp2pInstance( LibP2PService::new( executor, &config, EnrForkId::default(), &log, fork_context, &ChainSpec::minimal(), ) .await .expect("should build libp2p instance") .1, signal, ) } #[allow(dead_code)] pub fn get_enr(node: &LibP2PService) -> Enr { node.swarm.behaviour().local_enr() } // Returns `n` libp2p peers in fully connected topology. #[allow(dead_code)] pub async fn build_full_mesh( rt: Weak, log: slog::Logger, n: usize, ) -> Vec { let mut nodes = Vec::with_capacity(n); for _ in 0..n { nodes.push(build_libp2p_instance(rt.clone(), vec![], log.clone()).await); } let multiaddrs: Vec = nodes .iter() .map(|x| get_enr(x).multiaddr()[1].clone()) .collect(); for (i, node) in nodes.iter_mut().enumerate().take(n) { for (j, multiaddr) in multiaddrs.iter().enumerate().skip(i) { if i != j { match libp2p::Swarm::dial_addr(&mut node.swarm, multiaddr.clone()) { Ok(()) => debug!(log, "Connected"), Err(_) => error!(log, "Failed to connect"), }; } } } nodes } // Constructs a pair of nodes with separate loggers. The sender dials the receiver. // This returns a (sender, receiver) pair. #[allow(dead_code)] pub async fn build_node_pair( rt: Weak, log: &slog::Logger, ) -> (Libp2pInstance, Libp2pInstance) { let sender_log = log.new(o!("who" => "sender")); let receiver_log = log.new(o!("who" => "receiver")); let mut sender = build_libp2p_instance(rt.clone(), vec![], sender_log).await; let mut receiver = build_libp2p_instance(rt, vec![], receiver_log).await; let receiver_multiaddr = receiver.swarm.behaviour_mut().local_enr().multiaddr()[1].clone(); // let the two nodes set up listeners let sender_fut = async { loop { if let Libp2pEvent::NewListenAddr(_) = sender.next_event().await { return; } } }; let receiver_fut = async { loop { if let Libp2pEvent::NewListenAddr(_) = receiver.next_event().await { return; } } }; let joined = futures::future::join(sender_fut, receiver_fut); // wait for either both nodes to listen or a timeout tokio::select! { _ = tokio::time::sleep(Duration::from_millis(500)) => {} _ = joined => {} } match libp2p::Swarm::dial_addr(&mut sender.swarm, receiver_multiaddr.clone()) { Ok(()) => { debug!(log, "Sender dialed receiver"; "address" => format!("{:?}", receiver_multiaddr)) } Err(_) => error!(log, "Dialing failed"), }; (sender, receiver) } // Returns `n` peers in a linear topology #[allow(dead_code)] pub async fn build_linear(rt: Weak, log: slog::Logger, n: usize) -> Vec { let mut nodes = Vec::with_capacity(n); for _ in 0..n { nodes.push(build_libp2p_instance(rt.clone(), vec![], log.clone()).await); } let multiaddrs: Vec = nodes .iter() .map(|x| get_enr(x).multiaddr()[1].clone()) .collect(); for i in 0..n - 1 { match libp2p::Swarm::dial_addr(&mut nodes[i].swarm, multiaddrs[i + 1].clone()) { Ok(()) => debug!(log, "Connected"), Err(_) => error!(log, "Failed to connect"), }; } nodes }