Upgrade to libp2p-0.31. (#7606)

* Upgrade to libp2p-0.31.

* Address line width.

* Add generous incoming connection limit.

* Remove old noise configuration.

substrate/client/authority-discovery/src/error.rs

@@ -31,7 +31,7 @@ pub enum Error {
 	/// Failed to verify a dht payload with the given signature.
 	VerifyingDhtPayload,
 	/// Failed to hash the authority id to be used as a dht key.
-	HashingAuthorityId(libp2p::core::multiaddr::multihash::EncodeError),
+	HashingAuthorityId(libp2p::core::multiaddr::multihash::Error),
 	/// Failed calling into the Substrate runtime.
 	CallingRuntime(sp_blockchain::Error),
 	/// Received a dht record with a key that does not match any in-flight awaited keys.

substrate/client/authority-discovery/src/worker.rs

@@ -28,7 +28,7 @@ use futures::{FutureExt, Stream, StreamExt, stream::Fuse};
 use addr_cache::AddrCache;
 use async_trait::async_trait;
 use codec::Decode;
-use libp2p::{core::multiaddr, multihash::Multihash};
+use libp2p::{core::multiaddr, multihash::{Multihash, Hasher}};
 use log::{debug, error, log_enabled};
 use prometheus_endpoint::{Counter, CounterVec, Gauge, Opts, U64, register};
 use prost::Message;

substrate/client/authority-discovery/src/worker/addr_cache.rs

@@ -139,7 +139,7 @@ fn peer_id_from_multiaddr(addr: &Multiaddr) -> Option<PeerId> {
 mod tests {
 	use super::*;
 
-	use libp2p::multihash;
+	use libp2p::multihash::{self, Multihash};
 	use quickcheck::{Arbitrary, Gen, QuickCheck, TestResult};
 	use rand::Rng;
 
@@ -163,7 +163,7 @@ mod tests {
 		fn arbitrary<G: Gen>(g: &mut G) -> Self {
 			let seed: [u8; 32] = g.gen();
 			let peer_id = PeerId::from_multihash(
-				multihash::wrap(multihash::Code::Sha2_256, &seed)
+				Multihash::wrap(multihash::Code::Sha2_256.into(), &seed).unwrap()
 			).unwrap();
 			let multiaddr = "/ip6/2001:db8:0:0:0:0:0:2/tcp/30333".parse::<Multiaddr>()
 				.unwrap()