swarm/behaviour: Remove deprecated NetworkBehaviourEventProcess (#2840)

Removes the `NetworkBehaviourEventProcess` and all its associated logic.

See deprecation pull request https://github.com/libp2p/rust-libp2p/pull/2784.

Find rational in https://github.com/libp2p/rust-libp2p/pull/2751.

swarm/src/behaviour.rs

@@ -321,24 +321,6 @@ pub trait PollParameters {
     fn local_peer_id(&self) -> &PeerId;
 }
 
-/// When deriving [`NetworkBehaviour`] this trait must by default be implemented for all the
-/// possible event types generated by the inner behaviours.
-///
-/// You can opt out of this behaviour through `#[behaviour(event_process = false)]`. See the
-/// documentation of [`NetworkBehaviour`] for details.
-#[deprecated(
-    since = "0.38.0",
-    note = "Use `#[behaviour(out_event = \"MyBehaviourEvent\")]` instead. See \
-            https://github.com/libp2p/rust-libp2p/blob/master/swarm/CHANGELOG.md#0380 \
-            for instructions on how to migrate. Will be removed with \
-            https://github.com/libp2p/rust-libp2p/pull/2751."
-)]
-pub trait NetworkBehaviourEventProcess<TEvent> {
-    /// Called when one of the fields of the type you're deriving `NetworkBehaviour` on generates
-    /// an event.
-    fn inject_event(&mut self, event: TEvent);
-}
-
 /// An action that a [`NetworkBehaviour`] can trigger in the [`Swarm`]
 /// in whose context it is executing.
 ///

swarm/src/behaviour/either.rs

@@ -19,8 +19,6 @@
 // DEALINGS IN THE SOFTWARE.
 
 use crate::handler::{either::IntoEitherHandler, ConnectionHandler, IntoConnectionHandler};
-#[allow(deprecated)]
-pub use crate::NetworkBehaviourEventProcess;
 use crate::{DialError, NetworkBehaviour, NetworkBehaviourAction, PollParameters};
 use either::Either;
 use libp2p_core::{
@@ -235,18 +233,3 @@ where
         Poll::Ready(event)
     }
 }
-
-#[allow(deprecated)]
-impl<TEvent, TBehaviourLeft, TBehaviourRight> NetworkBehaviourEventProcess<TEvent>
-    for Either<TBehaviourLeft, TBehaviourRight>
-where
-    TBehaviourLeft: NetworkBehaviourEventProcess<TEvent>,
-    TBehaviourRight: NetworkBehaviourEventProcess<TEvent>,
-{
-    fn inject_event(&mut self, event: TEvent) {
-        match self {
-            Either::Left(a) => a.inject_event(event),
-            Either::Right(b) => b.inject_event(event),
-        }
-    }
-}

swarm/src/behaviour/toggle.rs

@@ -23,8 +23,6 @@ use crate::handler::{
     KeepAlive, SubstreamProtocol,
 };
 use crate::upgrade::{InboundUpgradeSend, OutboundUpgradeSend, SendWrapper};
-#[allow(deprecated)]
-pub use crate::NetworkBehaviourEventProcess;
 use crate::{DialError, NetworkBehaviour, NetworkBehaviourAction, PollParameters};
 use either::Either;
 use libp2p_core::{
@@ -232,18 +230,6 @@ where
     }
 }
 
-#[allow(deprecated)]
-impl<TEvent, TBehaviour> NetworkBehaviourEventProcess<TEvent> for Toggle<TBehaviour>
-where
-    TBehaviour: NetworkBehaviourEventProcess<TEvent>,
-{
-    fn inject_event(&mut self, event: TEvent) {
-        if let Some(inner) = self.inner.as_mut() {
-            inner.inject_event(event);
-        }
-    }
-}
-
 /// Implementation of `IntoConnectionHandler` that can be in the disabled state.
 pub struct ToggleIntoConnectionHandler<TInner> {
     inner: Option<TInner>,

swarm/src/lib.rs

@@ -63,8 +63,6 @@ pub mod behaviour;
 pub mod dial_opts;
 pub mod handler;
 
-#[allow(deprecated)]
-pub use behaviour::NetworkBehaviourEventProcess;
 pub use behaviour::{
     CloseConnection, NetworkBehaviour, NetworkBehaviourAction, NotifyHandler, PollParameters,
 };