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151 lines
4.8 KiB
151 lines
4.8 KiB
use libp2p::futures::future;
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use libp2p::futures::future::FutureExt;
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use libp2p::{
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core::{muxing::StreamMuxerBox, transport::memory::MemoryTransport, upgrade::Version},
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identity,
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noise::{self, NoiseConfig, X25519Spec},
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swarm::{NetworkBehaviour, SwarmBuilder, SwarmEvent},
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yamux::YamuxConfig,
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Multiaddr, PeerId, Swarm, Transport,
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};
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use std::{fmt::Debug, future::Future, time::Duration};
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use tokio::runtime::Handle;
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use tokio::time;
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#[allow(missing_debug_implementations)]
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pub struct Actor<B: NetworkBehaviour> {
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pub swarm: Swarm<B>,
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pub addr: Multiaddr,
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pub peer_id: PeerId,
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}
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pub async fn new_connected_swarm_pair<B, F>(behaviour_fn: F, handle: Handle) -> (Actor<B>, Actor<B>)
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where
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B: NetworkBehaviour,
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F: Fn(PeerId, identity::Keypair) -> B + Clone,
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<B as NetworkBehaviour>::OutEvent: Debug,
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{
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let (swarm, addr, peer_id) = new_swarm(behaviour_fn.clone(), handle.clone());
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let mut alice = Actor {
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swarm,
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addr,
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peer_id,
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};
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let (swarm, addr, peer_id) = new_swarm(behaviour_fn, handle);
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let mut bob = Actor {
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swarm,
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addr,
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peer_id,
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};
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connect(&mut alice.swarm, &mut bob.swarm).await;
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(alice, bob)
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}
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pub fn new_swarm<B: NetworkBehaviour, F: Fn(PeerId, identity::Keypair) -> B>(
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behaviour_fn: F,
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handle: Handle,
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) -> (Swarm<B>, Multiaddr, PeerId) {
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let id_keys = identity::Keypair::generate_ed25519();
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let peer_id = PeerId::from(id_keys.public());
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let dh_keys = noise::Keypair::<X25519Spec>::new()
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.into_authentic(&id_keys)
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.expect("failed to create dh_keys");
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let noise = NoiseConfig::xx(dh_keys).into_authenticated();
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let transport = MemoryTransport::default()
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.upgrade(Version::V1)
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.authenticate(noise)
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.multiplex(YamuxConfig::default())
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.map(|(peer, muxer), _| (peer, StreamMuxerBox::new(muxer)))
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.boxed();
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let mut swarm: Swarm<B> = SwarmBuilder::new(transport, behaviour_fn(peer_id, id_keys), peer_id)
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.executor(Box::new(move |f| {
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handle.spawn(f);
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}))
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.build();
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let address_port = rand::random::<u64>();
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let addr = format!("/memory/{}", address_port)
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.parse::<Multiaddr>()
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.unwrap();
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Swarm::listen_on(&mut swarm, addr.clone()).unwrap();
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(swarm, addr, peer_id)
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}
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pub async fn await_events_or_timeout<A, B>(
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alice_event: impl Future<Output = A>,
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bob_event: impl Future<Output = B>,
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) -> (A, B) {
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time::timeout(
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Duration::from_secs(10),
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future::join(alice_event, bob_event),
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)
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.await
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.expect("network behaviours to emit an event within 10 seconds")
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}
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/// Connects two swarms with each other.
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///
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/// This assumes the transport that is in use can be used by Alice to connect to
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/// the listen address that is emitted by Bob. In other words, they have to be
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/// on the same network. The memory transport used by the above `new_swarm`
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/// function fulfills this.
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///
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/// We also assume that the swarms don't emit any behaviour events during the
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/// connection phase. Any event emitted is considered a bug from this functions
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/// PoV because they would be lost.
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pub async fn connect<B>(alice: &mut Swarm<B>, bob: &mut Swarm<B>)
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where
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B: NetworkBehaviour,
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<B as NetworkBehaviour>::OutEvent: Debug,
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{
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let mut alice_connected = false;
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let mut bob_connected = false;
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while !(alice_connected && bob_connected) {
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libp2p::futures::select! {
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alice_event = alice.next_event().fuse() => {
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match alice_event {
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SwarmEvent::ConnectionEstablished { .. } => {
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log::info!("alice connected");
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alice_connected = true;
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}
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SwarmEvent::Behaviour(event) => {
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panic!(
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"alice unexpectedly emitted a behaviour event during connection: {:?}",
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event
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);
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}
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_ => {}
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}
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}
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bob_event = bob.next_event().fuse() => {
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match bob_event {
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SwarmEvent::ConnectionEstablished { .. } => {
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log::info!("bob connected");
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bob_connected = true;
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}
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SwarmEvent::NewListenAddr(addr) => {
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Swarm::dial_addr(alice, addr).unwrap();
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}
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SwarmEvent::Behaviour(event) => {
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panic!(
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"bob unexpectedly emitted a behaviour event during connection: {:?}",
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event
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);
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}
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_ => {}
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}
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}
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}
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}
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}
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