562 lines
22 KiB
Rust
562 lines
22 KiB
Rust
use crate::discovery::{enr::Eth2Enr, Discovery};
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use crate::peer_manager::{PeerManager, PeerManagerEvent};
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use crate::rpc::*;
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use crate::types::{GossipEncoding, GossipKind, GossipTopic};
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use crate::{error, Enr, NetworkConfig, NetworkGlobals, PubsubMessage, TopicHash};
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use futures::prelude::*;
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use libp2p::{
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core::{identity::Keypair, ConnectedPoint},
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discv5::Discv5Event,
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gossipsub::{Gossipsub, GossipsubEvent, MessageId},
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identify::{Identify, IdentifyEvent},
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swarm::{NetworkBehaviourAction, NetworkBehaviourEventProcess},
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tokio_io::{AsyncRead, AsyncWrite},
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NetworkBehaviour, PeerId,
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};
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use lru::LruCache;
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use slog::{crit, debug, o, warn};
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use std::marker::PhantomData;
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use std::sync::Arc;
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use types::{EnrForkId, EthSpec, SubnetId};
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const MAX_IDENTIFY_ADDRESSES: usize = 20;
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/// Builds the network behaviour that manages the core protocols of eth2.
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/// This core behaviour is managed by `Behaviour` which adds peer management to all core
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/// behaviours.
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#[derive(NetworkBehaviour)]
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#[behaviour(out_event = "BehaviourEvent<TSpec>", poll_method = "poll")]
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pub struct Behaviour<TSubstream: AsyncRead + AsyncWrite, TSpec: EthSpec> {
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/// The routing pub-sub mechanism for eth2.
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gossipsub: Gossipsub<TSubstream>,
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/// The Eth2 RPC specified in the wire-0 protocol.
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eth2_rpc: RPC<TSubstream, TSpec>,
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/// Keep regular connection to peers and disconnect if absent.
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// TODO: Using id for initial interop. This will be removed by mainnet.
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/// Provides IP addresses and peer information.
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identify: Identify<TSubstream>,
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/// Discovery behaviour.
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discovery: Discovery<TSubstream, TSpec>,
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/// The peer manager that keeps track of peer's reputation and status.
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#[behaviour(ignore)]
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peer_manager: PeerManager<TSpec>,
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/// The events generated by this behaviour to be consumed in the swarm poll.
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#[behaviour(ignore)]
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events: Vec<BehaviourEvent<TSpec>>,
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/// The current meta data of the node, so respond to pings and get metadata
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#[behaviour(ignore)]
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meta_data: MetaData<TSpec>,
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/// A cache of recently seen gossip messages. This is used to filter out any possible
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/// duplicates that may still be seen over gossipsub.
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#[behaviour(ignore)]
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seen_gossip_messages: LruCache<MessageId, ()>,
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/// A collections of variables accessible outside the network service.
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#[behaviour(ignore)]
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network_globals: Arc<NetworkGlobals<TSpec>>,
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#[behaviour(ignore)]
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/// Keeps track of the current EnrForkId for upgrading gossipsub topics.
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// NOTE: This can be accessed via the network_globals ENR. However we keep it here for quick
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// lookups for every gossipsub message send.
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enr_fork_id: EnrForkId,
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#[behaviour(ignore)]
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/// Logger for behaviour actions.
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log: slog::Logger,
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}
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/// Implements the combined behaviour for the libp2p service.
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impl<TSubstream: AsyncRead + AsyncWrite, TSpec: EthSpec> Behaviour<TSubstream, TSpec> {
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pub fn new(
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local_key: &Keypair,
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net_conf: &NetworkConfig,
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network_globals: Arc<NetworkGlobals<TSpec>>,
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log: &slog::Logger,
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) -> error::Result<Self> {
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let local_peer_id = local_key.public().into_peer_id();
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let behaviour_log = log.new(o!());
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let identify = Identify::new(
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"lighthouse/libp2p".into(),
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version::version(),
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local_key.public(),
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);
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let enr_fork_id = network_globals
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.local_enr
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.read()
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.eth2()
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.expect("Local ENR must have a fork id");
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let attnets = network_globals
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.local_enr
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.read()
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.bitfield::<TSpec>()
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.expect("Local ENR must have subnet bitfield");
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let meta_data = MetaData {
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seq_number: 1,
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attnets,
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};
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Ok(Behaviour {
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eth2_rpc: RPC::new(log.clone()),
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gossipsub: Gossipsub::new(local_peer_id, net_conf.gs_config.clone()),
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discovery: Discovery::new(local_key, net_conf, network_globals.clone(), log)?,
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identify,
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peer_manager: PeerManager::new(network_globals.clone(), log),
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events: Vec::new(),
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seen_gossip_messages: LruCache::new(100_000),
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meta_data,
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network_globals,
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enr_fork_id,
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log: behaviour_log,
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})
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}
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/// Obtain a reference to the discovery protocol.
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pub fn discovery(&self) -> &Discovery<TSubstream, TSpec> {
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&self.discovery
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}
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/// Obtain a reference to the gossipsub protocol.
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pub fn gs(&self) -> &Gossipsub<TSubstream> {
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&self.gossipsub
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}
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/* Pubsub behaviour functions */
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/// Subscribes to a gossipsub topic kind, letting the network service determine the
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/// encoding and fork version.
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pub fn subscribe_kind(&mut self, kind: GossipKind) -> bool {
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let gossip_topic = GossipTopic::new(
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kind,
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GossipEncoding::default(),
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self.enr_fork_id.fork_digest,
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);
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self.subscribe(gossip_topic)
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}
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/// Unsubscribes from a gossipsub topic kind, letting the network service determine the
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/// encoding and fork version.
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pub fn unsubscribe_kind(&mut self, kind: GossipKind) -> bool {
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let gossip_topic = GossipTopic::new(
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kind,
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GossipEncoding::default(),
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self.enr_fork_id.fork_digest,
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);
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self.unsubscribe(gossip_topic)
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}
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/// Subscribes to a specific subnet id;
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pub fn subscribe_to_subnet(&mut self, subnet_id: SubnetId) -> bool {
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let topic = GossipTopic::new(
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subnet_id.into(),
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GossipEncoding::default(),
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self.enr_fork_id.fork_digest,
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);
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self.subscribe(topic)
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}
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/// Un-Subscribes from a specific subnet id;
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pub fn unsubscribe_from_subnet(&mut self, subnet_id: SubnetId) -> bool {
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let topic = GossipTopic::new(
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subnet_id.into(),
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GossipEncoding::default(),
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self.enr_fork_id.fork_digest,
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);
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self.unsubscribe(topic)
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}
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/// Subscribes to a gossipsub topic.
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fn subscribe(&mut self, topic: GossipTopic) -> bool {
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// update the network globals
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self.network_globals
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.gossipsub_subscriptions
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.write()
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.insert(topic.clone());
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let topic_str: String = topic.clone().into();
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debug!(self.log, "Subscribed to topic"; "topic" => topic_str);
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self.gossipsub.subscribe(topic.into())
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}
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/// Unsubscribe from a gossipsub topic.
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fn unsubscribe(&mut self, topic: GossipTopic) -> bool {
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// update the network globals
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self.network_globals
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.gossipsub_subscriptions
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.write()
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.remove(&topic);
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// unsubscribe from the topic
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self.gossipsub.unsubscribe(topic.into())
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}
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/// Publishes a list of messages on the pubsub (gossipsub) behaviour, choosing the encoding.
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pub fn publish(&mut self, messages: Vec<PubsubMessage<TSpec>>) {
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for message in messages {
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for topic in message.topics(GossipEncoding::default(), self.enr_fork_id.fork_digest) {
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match message.encode(GossipEncoding::default()) {
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Ok(message_data) => {
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self.gossipsub.publish(&topic.into(), message_data);
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}
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Err(e) => crit!(self.log, "Could not publish message"; "error" => e),
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}
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}
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}
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}
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/// Forwards a message that is waiting in gossipsub's mcache. Messages are only propagated
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/// once validated by the beacon chain.
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pub fn propagate_message(&mut self, propagation_source: &PeerId, message_id: MessageId) {
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self.gossipsub
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.propagate_message(&message_id, propagation_source);
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}
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/* Eth2 RPC behaviour functions */
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/// Sends an RPC Request/Response via the RPC protocol.
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pub fn send_rpc(&mut self, peer_id: PeerId, rpc_event: RPCEvent<TSpec>) {
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self.eth2_rpc.send_rpc(peer_id, rpc_event);
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}
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/* Discovery / Peer management functions */
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/// Notify discovery that the peer has been banned.
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pub fn peer_banned(&mut self, peer_id: PeerId) {
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self.discovery.peer_banned(peer_id);
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}
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/// Notify discovery that the peer has been unbanned.
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pub fn peer_unbanned(&mut self, peer_id: &PeerId) {
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self.discovery.peer_unbanned(peer_id);
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}
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/// Returns an iterator over all enr entries in the DHT.
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pub fn enr_entries(&mut self) -> impl Iterator<Item = &Enr> {
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self.discovery.enr_entries()
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}
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/// Add an ENR to the routing table of the discovery mechanism.
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pub fn add_enr(&mut self, enr: Enr) {
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self.discovery.add_enr(enr);
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}
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/// Updates a subnet value to the ENR bitfield.
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///
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/// The `value` is `true` if a subnet is being added and false otherwise.
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pub fn update_enr_subnet(&mut self, subnet_id: SubnetId, value: bool) {
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if let Err(e) = self.discovery.update_enr_bitfield(subnet_id, value) {
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crit!(self.log, "Could not update ENR bitfield"; "error" => e);
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}
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// update the local meta data which informs our peers of the update during PINGS
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self.update_metadata();
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}
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/// A request to search for peers connected to a long-lived subnet.
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pub fn peers_request(&mut self, subnet_id: SubnetId) {
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self.discovery.peers_request(subnet_id);
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}
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/// Updates the local ENR's "eth2" field with the latest EnrForkId.
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pub fn update_fork_version(&mut self, enr_fork_id: EnrForkId) {
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self.discovery.update_eth2_enr(enr_fork_id.clone());
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// unsubscribe from all gossip topics and re-subscribe to their new fork counterparts
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let subscribed_topics = self
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.network_globals
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.gossipsub_subscriptions
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.read()
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.iter()
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.cloned()
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.collect::<Vec<GossipTopic>>();
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// unsubscribe from all topics
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for topic in &subscribed_topics {
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self.unsubscribe(topic.clone());
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}
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// re-subscribe modifying the fork version
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for mut topic in subscribed_topics {
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*topic.digest() = enr_fork_id.fork_digest;
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self.subscribe(topic);
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}
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// update the local reference
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self.enr_fork_id = enr_fork_id;
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}
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/* Private internal functions */
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/// Updates the current meta data of the node.
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fn update_metadata(&mut self) {
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self.meta_data.seq_number += 1;
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self.meta_data.attnets = self
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.discovery
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.local_enr()
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.bitfield::<TSpec>()
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.expect("Local discovery must have bitfield");
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}
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/// Sends a PING/PONG request/response to a peer.
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fn send_ping(&mut self, id: RequestId, peer_id: PeerId) {
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let pong_response = RPCEvent::Response(
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id,
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RPCErrorResponse::Success(RPCResponse::Pong(crate::rpc::methods::Ping {
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data: self.meta_data.seq_number,
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})),
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);
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self.send_rpc(peer_id, pong_response);
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}
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/// Sends a METADATA request to a peer.
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fn send_meta_data_request(&mut self, peer_id: PeerId) {
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let metadata_request =
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RPCEvent::Request(RequestId::from(0usize), RPCRequest::MetaData(PhantomData));
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self.send_rpc(peer_id, metadata_request);
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}
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/// Sends a METADATA response to a peer.
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fn send_meta_data_response(&mut self, id: RequestId, peer_id: PeerId) {
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let metadata_response = RPCEvent::Response(
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id,
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RPCErrorResponse::Success(RPCResponse::MetaData(self.meta_data.clone())),
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);
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self.send_rpc(peer_id, metadata_response);
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}
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}
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// Implement the NetworkBehaviourEventProcess trait so that we can derive NetworkBehaviour for Behaviour
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impl<TSubstream: AsyncRead + AsyncWrite, TSpec: EthSpec>
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NetworkBehaviourEventProcess<GossipsubEvent> for Behaviour<TSubstream, TSpec>
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{
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fn inject_event(&mut self, event: GossipsubEvent) {
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match event {
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GossipsubEvent::Message(propagation_source, id, gs_msg) => {
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// Note: We are keeping track here of the peer that sent us the message, not the
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// peer that originally published the message.
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if self.seen_gossip_messages.put(id.clone(), ()).is_none() {
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match PubsubMessage::decode(&gs_msg.topics, &gs_msg.data) {
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Err(e) => {
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debug!(self.log, "Could not decode gossipsub message"; "error" => format!("{}", e))
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}
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Ok(msg) => {
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// if this message isn't a duplicate, notify the network
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self.events.push(BehaviourEvent::PubsubMessage {
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id,
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source: propagation_source,
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topics: gs_msg.topics,
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message: msg,
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});
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}
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}
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} else {
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warn!(self.log, "A duplicate gossipsub message was received"; "message" => format!("{:?}", gs_msg));
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}
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}
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GossipsubEvent::Subscribed { peer_id, topic } => {
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self.events
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.push(BehaviourEvent::PeerSubscribed(peer_id, topic));
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}
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GossipsubEvent::Unsubscribed { .. } => {}
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}
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}
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}
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impl<TSubstream: AsyncRead + AsyncWrite, TSpec: EthSpec>
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NetworkBehaviourEventProcess<RPCMessage<TSpec>> for Behaviour<TSubstream, TSpec>
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{
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fn inject_event(&mut self, event: RPCMessage<TSpec>) {
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match event {
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// TODO: These are temporary methods to give access to injected behaviour
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// events to the
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// peer manager. After a behaviour re-write remove these:
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RPCMessage::PeerConnectedHack(peer_id, connected_point) => {
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match connected_point {
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ConnectedPoint::Dialer { .. } => self.peer_manager.connect_outgoing(&peer_id),
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ConnectedPoint::Listener { .. } => self.peer_manager.connect_ingoing(&peer_id),
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};
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// Find ENR info about a peer if possible.
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if let Some(enr) = self.discovery.enr_of_peer(&peer_id) {
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let bitfield = match enr.bitfield::<TSpec>() {
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Ok(v) => v,
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Err(e) => {
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warn!(self.log, "Peer has invalid ENR bitfield";
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"peer_id" => format!("{}", peer_id),
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"error" => format!("{:?}", e));
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return;
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}
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};
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// use this as a baseline, until we get the actual meta-data
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let meta_data = MetaData {
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seq_number: 0,
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attnets: bitfield,
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};
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// TODO: Shift to the peer manager
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self.network_globals
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.peers
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.write()
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.add_metadata(&peer_id, meta_data);
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}
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}
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RPCMessage::PeerDisconnectedHack(peer_id, _connected_point) => {
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self.peer_manager.notify_disconnect(&peer_id)
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}
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RPCMessage::PeerDialed(peer_id) => {
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self.events.push(BehaviourEvent::PeerDialed(peer_id))
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}
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RPCMessage::PeerDisconnected(peer_id) => {
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self.events.push(BehaviourEvent::PeerDisconnected(peer_id))
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}
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RPCMessage::RPC(peer_id, rpc_event) => {
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// The METADATA and PING RPC responses are handled within the behaviour and not
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// propagated
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// TODO: Improve the RPC types to better handle this logic discrepancy
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match rpc_event {
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RPCEvent::Request(id, RPCRequest::Ping(ping)) => {
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// inform the peer manager and send the response
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self.peer_manager.ping_request(&peer_id, ping.data);
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self.send_ping(id, peer_id);
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}
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RPCEvent::Request(id, RPCRequest::MetaData(_)) => {
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// send the requested meta-data
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self.send_meta_data_response(id, peer_id);
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}
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RPCEvent::Response(_, RPCErrorResponse::Success(RPCResponse::Pong(ping))) => {
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self.peer_manager.pong_response(&peer_id, ping.data);
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}
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RPCEvent::Response(
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_,
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RPCErrorResponse::Success(RPCResponse::MetaData(meta_data)),
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) => {
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self.peer_manager.meta_data_response(&peer_id, meta_data);
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}
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RPCEvent::Request(_, RPCRequest::Status(_))
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| RPCEvent::Response(_, RPCErrorResponse::Success(RPCResponse::Status(_))) => {
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// inform the peer manager that we have received a status from a peer
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self.peer_manager.peer_statusd(&peer_id);
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// propagate the STATUS message upwards
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self.events.push(BehaviourEvent::RPC(peer_id, rpc_event));
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}
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_ => {
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// propagate all other RPC messages upwards
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self.events.push(BehaviourEvent::RPC(peer_id, rpc_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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impl<TSubstream: AsyncRead + AsyncWrite, TSpec: EthSpec> Behaviour<TSubstream, TSpec> {
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/// Consumes the events list when polled.
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fn poll<TBehaviourIn>(
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&mut self,
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) -> Async<NetworkBehaviourAction<TBehaviourIn, BehaviourEvent<TSpec>>> {
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// check the peer manager for events
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loop {
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match self.peer_manager.poll() {
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Ok(Async::Ready(Some(event))) => match event {
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PeerManagerEvent::Status(peer_id) => {
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// it's time to status. We don't keep a beacon chain reference here, so we inform
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// the network to send a status to this peer
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return Async::Ready(NetworkBehaviourAction::GenerateEvent(
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BehaviourEvent::StatusPeer(peer_id),
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));
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}
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PeerManagerEvent::Ping(peer_id) => {
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// send a ping to this peer
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self.send_ping(RequestId::from(0usize), peer_id);
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}
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PeerManagerEvent::MetaData(peer_id) => {
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self.send_meta_data_request(peer_id);
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}
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PeerManagerEvent::DisconnectPeer(_peer_id) => {
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//TODO: Implement
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}
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PeerManagerEvent::BanPeer(_peer_id) => {
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//TODO: Implement
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}
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},
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|
Ok(Async::NotReady) => break,
|
|
Ok(Async::Ready(None)) | Err(_) => {
|
|
crit!(self.log, "Error polling peer manager");
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if !self.events.is_empty() {
|
|
return Async::Ready(NetworkBehaviourAction::GenerateEvent(self.events.remove(0)));
|
|
}
|
|
|
|
Async::NotReady
|
|
}
|
|
}
|
|
|
|
impl<TSubstream: AsyncRead + AsyncWrite, TSpec: EthSpec> NetworkBehaviourEventProcess<IdentifyEvent>
|
|
for Behaviour<TSubstream, TSpec>
|
|
{
|
|
fn inject_event(&mut self, event: IdentifyEvent) {
|
|
match event {
|
|
IdentifyEvent::Received {
|
|
peer_id,
|
|
mut info,
|
|
observed_addr,
|
|
} => {
|
|
if info.listen_addrs.len() > MAX_IDENTIFY_ADDRESSES {
|
|
debug!(
|
|
self.log,
|
|
"More than 20 addresses have been identified, truncating"
|
|
);
|
|
info.listen_addrs.truncate(MAX_IDENTIFY_ADDRESSES);
|
|
}
|
|
debug!(self.log, "Identified Peer"; "peer" => format!("{}", peer_id),
|
|
"protocol_version" => info.protocol_version,
|
|
"agent_version" => info.agent_version,
|
|
"listening_ addresses" => format!("{:?}", info.listen_addrs),
|
|
"observed_address" => format!("{:?}", observed_addr),
|
|
"protocols" => format!("{:?}", info.protocols)
|
|
);
|
|
}
|
|
IdentifyEvent::Sent { .. } => {}
|
|
IdentifyEvent::Error { .. } => {}
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<TSubstream: AsyncRead + AsyncWrite, TSpec: EthSpec> NetworkBehaviourEventProcess<Discv5Event>
|
|
for Behaviour<TSubstream, TSpec>
|
|
{
|
|
fn inject_event(&mut self, _event: Discv5Event) {
|
|
// discv5 has no events to inject
|
|
}
|
|
}
|
|
|
|
/// The types of events than can be obtained from polling the behaviour.
|
|
#[derive(Debug)]
|
|
pub enum BehaviourEvent<TSpec: EthSpec> {
|
|
/// A received RPC event and the peer that it was received from.
|
|
RPC(PeerId, RPCEvent<TSpec>),
|
|
/// We have completed an initial connection to a new peer.
|
|
PeerDialed(PeerId),
|
|
/// A peer has disconnected.
|
|
PeerDisconnected(PeerId),
|
|
/// A gossipsub message has been received.
|
|
PubsubMessage {
|
|
/// The gossipsub message id. Used when propagating blocks after validation.
|
|
id: MessageId,
|
|
/// The peer from which we received this message, not the peer that published it.
|
|
source: PeerId,
|
|
/// The topics that this message was sent on.
|
|
topics: Vec<TopicHash>,
|
|
/// The message itself.
|
|
message: PubsubMessage<TSpec>,
|
|
},
|
|
/// Subscribed to peer for given topic
|
|
PeerSubscribed(PeerId, TopicHash),
|
|
/// Inform the network to send a Status to this peer.
|
|
StatusPeer(PeerId),
|
|
}
|