Testnet compatible network upgrade (#587)

* Create libp2p instance

* Change logger to stdlog

* test_connection initial commit

* Add gossipsub test

* Delete tests in network crate

* Add test module

* Clean tests

* Remove dependency on discovery

* Working publish between 2 nodes
TODO: Publish should be called just once

* Working 2 peer gossipsub test with additional events

* Cleanup test

* Add rpc test

* Star topology discovery WIP

* build_nodes builds and connects n nodes. Increase nodes in gossipsub test

* Add unsubscribe method and expose reference to gossipsub object for gossipsub tests

* Add gossipsub message forwarding test

* Fix gossipsub forward test

* Test improvements
* Remove discovery tests
* Simplify gossipsub forward test topology
* Add helper functions for topology building

* Clean up tests

* Update naming to new network spec

* Correct ssz encoding of protocol names

* Further additions to network upgrade

* Initial network spec update WIP

* Temp commit

* Builds one side of the streamed RPC responses

* Temporary commit

* Propagates streaming changes up into message handler

* Intermediate network update

* Partial update in upgrading to the new network spec

* Update dependencies, remove redundant deps

* Correct sync manager for block stream handling

* Re-write of RPC handler, improves efficiency and corrects bugs

* Stream termination update

* Completed refactor of rpc handler

* Remove crates

* Correct compile issues associated with test merge

* Build basic tests and testing structure for eth2-libp2p

* Enhance RPC tests and add logging

* Complete RPC testing framework and STATUS test

* Decoding bug fixes, log improvements, stream test

* Clean up RPC handler logging

* Decoder bug fix, empty block stream test

* Add BlocksByRoot RPC test

* Add Goodbye RPC test

* Syncing and stream handling bug fixes and performance improvements

* Applies discv5 bug fixes

* Adds DHT IP filtering for lighthouse - currently disabled

* Adds randomized network propagation as a CLI arg

* Add disconnect functionality

* Adds attestation handling and parent lookup

* Adds RPC error handling for the sync manager

* Allow parent's blocks to be already processed

* Update github workflow

* Adds reviewer suggestions

beacon_node/eth2-libp2p/src/service.rs

@@ -28,10 +28,13 @@ pub struct Service {
     /// The libp2p Swarm handler.
     //TODO: Make this private
     pub swarm: Swarm<Libp2pStream, Libp2pBehaviour>,
+
     /// This node's PeerId.
     pub local_peer_id: PeerId,
+
     /// Indicates if the listening address have been verified and compared to the expected ENR.
     pub verified_listen_address: bool,
+
     /// The libp2p logger handle.
     pub log: slog::Logger,
 }
@@ -190,6 +193,11 @@ impl Stream for Service {
                     BehaviourEvent::PeerDisconnected(peer_id) => {
                         return Ok(Async::Ready(Some(Libp2pEvent::PeerDisconnected(peer_id))));
                     }
+                    BehaviourEvent::PeerSubscribed(peer_id, topic) => {
+                        return Ok(Async::Ready(Some(Libp2pEvent::PeerSubscribed(
+                            peer_id, topic,
+                        ))));
+                    }
                 },
                 Ok(Async::Ready(None)) => unreachable!("Swarm stream shouldn't end"),
                 Ok(Async::NotReady) => {
@@ -202,6 +210,7 @@ impl Stream for Service {
                             }
                         }
                     }
+
                     break;
                 }
                 _ => break,
@@ -276,6 +285,8 @@ pub enum Libp2pEvent {
         topics: Vec<TopicHash>,
         message: PubsubMessage,
     },
+    /// Subscribed to peer for a topic hash.
+    PeerSubscribed(PeerId, TopicHash),
 }
 
 fn keypair_from_hex(hex_bytes: &str) -> error::Result<Keypair> {