Remove the last bits of unknown_os in the code base (#9718)

* Remove the last bits of unknown_os in the code base

* Fmt

substrate/client/network/src/discovery.rs

@@ -50,8 +50,6 @@ use crate::{config::ProtocolId, utils::LruHashSet};
 use futures::prelude::*;
 use futures_timer::Delay;
 use ip_network::IpNetwork;
-#[cfg(not(target_os = "unknown"))]
-use libp2p::mdns::{Mdns, MdnsConfig, MdnsEvent};
 use libp2p::{
 	core::{
 		connection::{ConnectionId, ListenerId},
@@ -66,6 +64,7 @@ use libp2p::{
 		GetClosestPeersError, Kademlia, KademliaBucketInserts, KademliaConfig, KademliaEvent,
 		QueryId, QueryResult, Quorum, Record,
 	},
+	mdns::{Mdns, MdnsConfig, MdnsEvent},
 	multiaddr::Protocol,
 	swarm::{
 		protocols_handler::multi::IntoMultiHandler, IntoProtocolsHandler, NetworkBehaviour,
@@ -156,9 +155,6 @@ impl DiscoveryConfig {
 
 	/// Should MDNS discovery be supported?
 	pub fn with_mdns(&mut self, value: bool) -> &mut Self {
-		if value && cfg!(target_os = "unknown") {
-			log::warn!(target: "sub-libp2p", "mDNS is not available on this platform")
-		}
 		self.enable_mdns = value;
 		self
 	}
@@ -234,7 +230,6 @@ impl DiscoveryConfig {
 			num_connections: 0,
 			allow_private_ipv4,
 			discovery_only_if_under_num,
-			#[cfg(not(target_os = "unknown"))]
 			mdns: if enable_mdns {
 				MdnsWrapper::Instantiating(Mdns::new(MdnsConfig::default()).boxed())
 			} else {
@@ -257,7 +252,6 @@ pub struct DiscoveryBehaviour {
 	/// Kademlia requests and answers.
 	kademlias: HashMap<ProtocolId, Kademlia<MemoryStore>>,
 	/// Discovers nodes on the local network.
-	#[cfg(not(target_os = "unknown"))]
 	mdns: MdnsWrapper,
 	/// Stream that fires when we need to perform the next random Kademlia query. `None` if
 	/// random walking is disabled.
@@ -505,7 +499,6 @@ impl NetworkBehaviour for DiscoveryBehaviour {
 				list_to_filter.extend(k.addresses_of_peer(peer_id))
 			}
 
-			#[cfg(not(target_os = "unknown"))]
 			list_to_filter.extend(self.mdns.addresses_of_peer(peer_id));
 
 			if !self.allow_private_ipv4 {
@@ -840,7 +833,6 @@ impl NetworkBehaviour for DiscoveryBehaviour {
 		}
 
 		// Poll mDNS.
-		#[cfg(not(target_os = "unknown"))]
 		while let Poll::Ready(ev) = self.mdns.poll(cx, params) {
 			match ev {
 				NetworkBehaviourAction::GenerateEvent(event) => match event {
@@ -890,14 +882,12 @@ fn protocol_name_from_protocol_id(id: &ProtocolId) -> Vec<u8> {
 
 /// [`Mdns::new`] returns a future. Instead of forcing [`DiscoveryConfig::finish`] and all its
 /// callers to be async, lazily instantiate [`Mdns`].
-#[cfg(not(target_os = "unknown"))]
 enum MdnsWrapper {
 	Instantiating(futures::future::BoxFuture<'static, std::io::Result<Mdns>>),
 	Ready(Mdns),
 	Disabled,
 }
 
-#[cfg(not(target_os = "unknown"))]
 impl MdnsWrapper {
 	fn addresses_of_peer(&mut self, peer_id: &PeerId) -> Vec<Multiaddr> {
 		match self {

substrate/client/network/src/transport.rs

@@ -25,10 +25,8 @@ use libp2p::{
 		transport::{Boxed, OptionalTransport},
 		upgrade,
 	},
-	identity, mplex, noise, PeerId, Transport,
+	dns, identity, mplex, noise, tcp, websocket, PeerId, Transport,
 };
-#[cfg(not(target_os = "unknown"))]
-use libp2p::{dns, tcp, websocket};
 use std::{sync::Arc, time::Duration};
 
 pub use self::bandwidth::BandwidthSinks;