protocols/dcutr: Fix clippy lints (#2772)

protocols/dcutr/src/behaviour.rs

@@ -65,6 +65,7 @@ pub enum UpgradeError {
     Handler(ConnectionHandlerUpgrErr<void::Void>),
 }
 
+#[derive(Default)]
 pub struct Behaviour {
     /// Queue of actions to return when polled.
     queued_actions: VecDeque<ActionBuilder>,
@@ -145,40 +146,35 @@ impl NetworkBehaviour for Behaviour {
         handler: Self::ConnectionHandler,
         _error: &DialError,
     ) {
-        match handler {
-            handler::Prototype::DirectConnection {
-                relayed_connection_id,
-                role: handler::Role::Initiator { attempt },
-            } => {
-                let peer_id =
-                    peer_id.expect("Peer of `Prototype::DirectConnection` is always known.");
-                if attempt < MAX_NUMBER_OF_UPGRADE_ATTEMPTS {
-                    self.queued_actions.push_back(ActionBuilder::Connect {
+        if let handler::Prototype::DirectConnection {
+            relayed_connection_id,
+            role: handler::Role::Initiator { attempt },
+        } = handler
+        {
+            let peer_id = peer_id.expect("Peer of `Prototype::DirectConnection` is always known.");
+            if attempt < MAX_NUMBER_OF_UPGRADE_ATTEMPTS {
+                self.queued_actions.push_back(ActionBuilder::Connect {
+                    peer_id,
+                    handler: NotifyHandler::One(relayed_connection_id),
+                    attempt: attempt + 1,
+                });
+            } else {
+                self.queued_actions.extend([
+                    NetworkBehaviourAction::NotifyHandler {
                         peer_id,
                         handler: NotifyHandler::One(relayed_connection_id),
-                        attempt: attempt + 1,
-                    });
-                } else {
-                    self.queued_actions.extend([
-                        NetworkBehaviourAction::NotifyHandler {
-                            peer_id,
-                            handler: NotifyHandler::One(relayed_connection_id),
-                            event: Either::Left(
-                                handler::relayed::Command::UpgradeFinishedDontKeepAlive,
-                            ),
-                        }
-                        .into(),
-                        NetworkBehaviourAction::GenerateEvent(
-                            Event::DirectConnectionUpgradeFailed {
-                                remote_peer_id: peer_id,
-                                error: UpgradeError::Dial,
-                            },
-                        )
-                        .into(),
-                    ]);
-                }
+                        event: Either::Left(
+                            handler::relayed::Command::UpgradeFinishedDontKeepAlive,
+                        ),
+                    }
+                    .into(),
+                    NetworkBehaviourAction::GenerateEvent(Event::DirectConnectionUpgradeFailed {
+                        remote_peer_id: peer_id,
+                        error: UpgradeError::Dial,
+                    })
+                    .into(),
+                ]);
             }
-            _ => {}
         }
     }
 
@@ -324,7 +320,6 @@ impl NetworkBehaviour for Behaviour {
 
 /// A [`NetworkBehaviourAction`], either complete, or still requiring data from [`PollParameters`]
 /// before being returned in [`Behaviour::poll`].
-#[allow(clippy::large_enum_variant)]
 enum ActionBuilder {
     Done(NetworkBehaviourAction<Event, handler::Prototype>),
     Connect {
@@ -333,7 +328,7 @@ enum ActionBuilder {
         peer_id: PeerId,
     },
     AcceptInboundConnect {
-        inbound_connect: protocol::inbound::PendingConnect,
+        inbound_connect: Box<protocol::inbound::PendingConnect>,
         handler: NotifyHandler,
         peer_id: PeerId,
     },

protocols/dcutr/src/handler/relayed.rs

@@ -44,7 +44,7 @@ pub enum Command {
     },
     AcceptInboundConnect {
         obs_addrs: Vec<Multiaddr>,
-        inbound_connect: protocol::inbound::PendingConnect,
+        inbound_connect: Box<protocol::inbound::PendingConnect>,
     },
     /// Upgrading the relayed connection to a direct connection either failed for good or succeeded.
     /// There is no need to keep the relayed connection alive for the sake of upgrading to a direct
@@ -76,7 +76,7 @@ impl fmt::Debug for Command {
 
 pub enum Event {
     InboundConnectRequest {
-        inbound_connect: protocol::inbound::PendingConnect,
+        inbound_connect: Box<protocol::inbound::PendingConnect>,
         remote_addr: Multiaddr,
     },
     InboundNegotiationFailed {
@@ -201,7 +201,7 @@ impl ConnectionHandler for Handler {
                 };
                 self.queued_events.push_back(ConnectionHandlerEvent::Custom(
                     Event::InboundConnectRequest {
-                        inbound_connect,
+                        inbound_connect: Box::new(inbound_connect),
                         remote_addr,
                     },
                 ));
@@ -245,9 +245,10 @@ impl ConnectionHandler for Handler {
                 inbound_connect,
                 obs_addrs,
             } => {
-                if let Some(_) = self
+                if self
                     .inbound_connect
                     .replace(inbound_connect.accept(obs_addrs).boxed())
+                    .is_some()
                 {
                     log::warn!(
                         "New inbound connect stream while still upgrading previous one. \
@@ -337,8 +338,7 @@ impl ConnectionHandler for Handler {
             _ => {
                 // Anything else is considered a fatal error or misbehaviour of
                 // the remote peer and results in closing the connection.
-                self.pending_error =
-                    Some(error.map_upgrade_err(|e| e.map_err(|e| EitherError::B(e))));
+                self.pending_error = Some(error.map_upgrade_err(|e| e.map_err(EitherError::B)));
             }
         }
     }