feat!: add error type to Actor trait

benches/fibonacci.rs

@@ -1,6 +1,7 @@
 use criterion::BenchmarkId;
 use criterion::Criterion;
 use criterion::{criterion_group, criterion_main};
+use kameo::error::Infallible;
 use kameo::mailbox::bounded::BoundedMailbox;
 use kameo::request::MessageSend;
 use kameo::{
@@ -12,6 +13,7 @@ struct FibActor {}
 
 impl Actor for FibActor {
     type Mailbox = BoundedMailbox<Self>;
+    type Error = Infallible;
 }
 
 struct Fib(u64);

benches/overhead.rs

@@ -1,5 +1,6 @@
 use criterion::Criterion;
 use criterion::{criterion_group, criterion_main};
+use kameo::error::Infallible;
 use kameo::mailbox::unbounded::UnboundedMailbox;
 use kameo::request::MessageSend;
 use kameo::{
@@ -20,6 +21,7 @@ fn actor(c: &mut Criterion) {
 
     impl Actor for BenchActor {
         type Mailbox = UnboundedMailbox<Self>;
+        type Error = Infallible;
     }
 
     impl Message<u32> for BenchActor {

examples/ask.rs

@@ -1,6 +1,7 @@
 use std::time::Duration;
 
 use kameo::{
+    error::Infallible,
     mailbox::unbounded::UnboundedMailbox,
     message::{Context, Message},
     request::MessageSendSync,
@@ -16,6 +17,7 @@ pub struct MyActor {
 
 impl Actor for MyActor {
     type Mailbox = UnboundedMailbox<Self>;
+    type Error = Infallible;
 
     fn name() -> &'static str {
         "MyActor"

examples/basic.rs

@@ -1,4 +1,5 @@
 use kameo::{
+    error::Infallible,
     mailbox::unbounded::UnboundedMailbox,
     message::{Context, Message},
     request::MessageSendSync,
@@ -14,6 +15,7 @@ pub struct MyActor {
 
 impl Actor for MyActor {
     type Mailbox = UnboundedMailbox<Self>;
+    type Error = Infallible;
 
     fn name() -> &'static str {
         "MyActor"

examples/stream.rs

@@ -3,7 +3,7 @@ use std::{future::pending, time};
 use futures::stream;
 use kameo::{
     actor::ActorRef,
-    error::BoxError,
+    error::Infallible,
     mailbox::unbounded::UnboundedMailbox,
     message::{Context, Message, StreamMessage},
     Actor,
@@ -19,8 +19,9 @@ pub struct MyActor {
 
 impl Actor for MyActor {
     type Mailbox = UnboundedMailbox<Self>;
+    type Error = Infallible;
 
-    async fn on_start(&mut self, actor_ref: ActorRef<Self>) -> Result<(), BoxError> {
+    async fn on_start(&mut self, actor_ref: ActorRef<Self>) -> Result<(), Self::Error> {
         let stream = Box::pin(
             stream::repeat(1)
                 .take(5)

macros/src/derive_actor.rs

@@ -50,6 +50,7 @@ impl ToTokens for DeriveActor {
             #[automatically_derived]
             impl #impl_generics ::kameo::actor::Actor for #ident #ty_generics #where_clause {
                 type Mailbox = #mailbox_expanded;
+                type Error = ::kameo::error::Infallible;
 
                 fn name() -> &'static str {
                     #name

src/actor.rs

@@ -28,12 +28,12 @@ pub mod pool;
 pub mod pubsub;
 mod spawn;
 
-use std::any;
+use std::{any, error::Error};
 
 use futures::Future;
 
 use crate::{
-    error::{ActorStopReason, BoxError, PanicError},
+    error::{ActorStopReason, PanicError},
     mailbox::Mailbox,
 };
 
@@ -117,6 +117,9 @@ pub trait Actor: Sized + Send + 'static {
     /// - **Unbounded Mailbox**: Allows an infinite number of messages, but can consume large amounts of memory.
     type Mailbox: Mailbox<Self>;
 
+    /// The error type which can occur in the actors lifecycle hooks.
+    type Error: Error + Send;
+
     /// The name of the actor, which can be useful for logging or debugging.
     ///
     /// # Default Implementation
@@ -145,7 +148,7 @@ pub trait Actor: Sized + Send + 'static {
     fn on_start(
         &mut self,
         actor_ref: ActorRef<Self>,
-    ) -> impl Future<Output = Result<(), BoxError>> + Send {
+    ) -> impl Future<Output = Result<(), Self::Error>> + Send {
         async { Ok(()) }
     }
 
@@ -165,7 +168,7 @@ pub trait Actor: Sized + Send + 'static {
         &mut self,
         actor_ref: WeakActorRef<Self>,
         err: PanicError,
-    ) -> impl Future<Output = Result<Option<ActorStopReason>, BoxError>> + Send {
+    ) -> impl Future<Output = Result<Option<ActorStopReason>, Self::Error>> + Send {
         async move { Ok(Some(ActorStopReason::Panicked(err))) }
     }
 
@@ -182,7 +185,7 @@ pub trait Actor: Sized + Send + 'static {
         actor_ref: WeakActorRef<Self>,
         id: ActorID,
         reason: ActorStopReason,
-    ) -> impl Future<Output = Result<Option<ActorStopReason>, BoxError>> + Send {
+    ) -> impl Future<Output = Result<Option<ActorStopReason>, Self::Error>> + Send {
         async move {
             match &reason {
                 ActorStopReason::Normal => Ok(None),
@@ -207,7 +210,7 @@ pub trait Actor: Sized + Send + 'static {
         &mut self,
         actor_ref: WeakActorRef<Self>,
         reason: ActorStopReason,
-    ) -> impl Future<Output = Result<(), BoxError>> + Send {
+    ) -> impl Future<Output = Result<(), Self::Error>> + Send {
         async { Ok(()) }
     }
 }

src/actor/pool.rs

@@ -50,7 +50,7 @@ use itertools::repeat_n;
 
 use crate::{
     actor::{Actor, ActorRef},
-    error::{ActorStopReason, BoxError, SendError},
+    error::{ActorStopReason, Infallible, SendError},
     mailbox::bounded::BoundedMailbox,
     message::{BoxDebug, Context, Message},
     reply::Reply,
@@ -165,12 +165,13 @@ where
     A: Actor,
 {
     type Mailbox = BoundedMailbox<Self>;
+    type Error = Infallible;
 
     fn name() -> &'static str {
         "ActorPool"
     }
 
-    async fn on_start(&mut self, actor_ref: ActorRef<Self>) -> Result<(), BoxError> {
+    async fn on_start(&mut self, actor_ref: ActorRef<Self>) -> Result<(), Self::Error> {
         for worker in &self.workers {
             worker.link(&actor_ref).await;
         }
@@ -183,7 +184,7 @@ where
         actor_ref: WeakActorRef<Self>,
         id: ActorID,
         _reason: ActorStopReason,
-    ) -> Result<Option<ActorStopReason>, BoxError> {
+    ) -> Result<Option<ActorStopReason>, Self::Error> {
         let Some(actor_ref) = actor_ref.upgrade() else {
             return Ok(None);
         };

src/actor/pubsub.rs

@@ -49,7 +49,7 @@ use std::collections::HashMap;
 use futures::future::{join_all, BoxFuture};
 
 use crate::{
-    error::SendError,
+    error::{Infallible, SendError},
     mailbox::bounded::BoundedMailbox,
     message::{Context, Message},
     request::{LocalTellRequest, MessageSend, TellRequest, WithoutRequestTimeout},
@@ -166,6 +166,7 @@ impl<M> PubSub<M> {
 
 impl<M: 'static> Actor for PubSub<M> {
     type Mailbox = BoundedMailbox<Self>;
+    type Error = Infallible;
 }
 
 impl<M> Default for PubSub<M> {

src/request/ask.rs

@@ -997,7 +997,7 @@ mod tests {
     use std::time::Duration;
 
     use crate::{
-        error::SendError,
+        error::{Infallible, SendError},
         mailbox::{
             bounded::{BoundedMailbox, BoundedMailboxReceiver},
             unbounded::UnboundedMailbox,
@@ -1013,6 +1013,7 @@ mod tests {
 
         impl Actor for MyActor {
             type Mailbox = BoundedMailbox<Self>;
+            type Error = Infallible;
         }
 
         struct Msg;
@@ -1060,6 +1061,7 @@ mod tests {
 
         impl Actor for MyActor {
             type Mailbox = UnboundedMailbox<Self>;
+            type Error = Infallible;
         }
 
         struct Msg;
@@ -1107,6 +1109,7 @@ mod tests {
 
         impl Actor for MyActor {
             type Mailbox = BoundedMailbox<Self>;
+            type Error = Infallible;
         }
 
         #[derive(Clone, Copy, PartialEq, Eq)]
@@ -1158,6 +1161,7 @@ mod tests {
 
         impl Actor for MyActor {
             type Mailbox = UnboundedMailbox<Self>;
+            type Error = Infallible;
         }
 
         #[derive(Clone, Copy, PartialEq, Eq)]
@@ -1209,6 +1213,7 @@ mod tests {
 
         impl Actor for MyActor {
             type Mailbox = BoundedMailbox<Self>;
+            type Error = Infallible;
 
             fn new_mailbox() -> (BoundedMailbox<Self>, BoundedMailboxReceiver<Self>) {
                 BoundedMailbox::new(1)
@@ -1256,6 +1261,7 @@ mod tests {
 
         impl Actor for MyActor {
             type Mailbox = BoundedMailbox<Self>;
+            type Error = Infallible;
 
             fn new_mailbox() -> (BoundedMailbox<Self>, BoundedMailboxReceiver<Self>) {
                 BoundedMailbox::new(1)
@@ -1317,6 +1323,7 @@ mod tests {
 
         impl Actor for MyActor {
             type Mailbox = BoundedMailbox<Self>;
+            type Error = Infallible;
         }
 
         #[derive(Clone, Copy, PartialEq, Eq)]
@@ -1363,6 +1370,7 @@ mod tests {
 
         impl Actor for MyActor {
             type Mailbox = UnboundedMailbox<Self>;
+            type Error = Infallible;
         }
 
         #[derive(Clone, Copy, PartialEq, Eq)]

src/request/tell.rs

@@ -518,7 +518,7 @@ mod tests {
     use std::time::Duration;
 
     use crate::{
-        error::SendError,
+        error::{Infallible, SendError},
         mailbox::{
             bounded::{BoundedMailbox, BoundedMailboxReceiver},
             unbounded::UnboundedMailbox,
@@ -537,6 +537,7 @@ mod tests {
 
         impl Actor for MyActor {
             type Mailbox = BoundedMailbox<Self>;
+            type Error = Infallible;
         }
 
         struct Msg;
@@ -574,6 +575,7 @@ mod tests {
 
         impl Actor for MyActor {
             type Mailbox = UnboundedMailbox<Self>;
+            type Error = Infallible;
         }
 
         struct Msg;
@@ -608,6 +610,7 @@ mod tests {
 
         impl Actor for MyActor {
             type Mailbox = BoundedMailbox<Self>;
+            type Error = Infallible;
         }
 
         #[derive(Clone, Copy, PartialEq, Eq)]
@@ -662,6 +665,7 @@ mod tests {
 
         impl Actor for MyActor {
             type Mailbox = UnboundedMailbox<Self>;
+            type Error = Infallible;
         }
 
         #[derive(Clone, Copy, PartialEq, Eq)]
@@ -720,6 +724,7 @@ mod tests {
 
         impl Actor for MyActor {
             type Mailbox = BoundedMailbox<Self>;
+            type Error = Infallible;
 
             fn new_mailbox() -> (BoundedMailbox<Self>, BoundedMailboxReceiver<Self>) {
                 BoundedMailbox::new(1)
@@ -774,6 +779,7 @@ mod tests {
 
         impl Actor for MyActor {
             type Mailbox = BoundedMailbox<Self>;
+            type Error = Infallible;
 
             fn new_mailbox() -> (BoundedMailbox<Self>, BoundedMailboxReceiver<Self>) {
                 BoundedMailbox::new(1)