Make everything async

Signed-off-by: Marcel Müller <neikos@neikos.email>

crates/tytix-core/Cargo.toml

@@ -13,5 +13,8 @@ categories = []
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+anyhow = "1"
 
 [dev-dependencies]
+macro_rules_attribute = "0.2"
+smol-macros = "0.1"

crates/tytix-core/src/lib.rs

@@ -4,6 +4,8 @@
 use std::any::Any;
 use std::any::TypeId;
 
+pub use anyhow;
+
 pub trait Message: Send + Any {
     type Reply: Send + Any;
 }
@@ -16,28 +18,44 @@ impl<M: Message> MessageIdentifier for M {
     const IDENT: BundleChain = BundleChain::of::<M>();
 }
 
-pub struct InternalMessage(Box<dyn std::any::Any>);
+pub struct InternalMessage {
+    value: Box<dyn std::any::Any>,
+    name: &'static str,
+}
 
 impl InternalMessage {
-    pub fn new(message: impl Message) -> InternalMessage {
-        InternalMessage(Box::new(message))
+    pub fn new<M: Any>(message: M) -> InternalMessage {
+        InternalMessage {
+            value: Box::new(message),
+            name: std::any::type_name::<M>(),
+        }
     }
 
-    pub fn into_inner<M: Message>(self) -> Result<M, InternalMessage> {
-        self.0.downcast().map(|v| *v).map_err(InternalMessage)
+    pub fn into_inner<M: Any>(self) -> Result<M, InternalMessage> {
+        self.value
+            .downcast()
+            .map(|v| *v)
+            .map_err(|value| InternalMessage {
+                value,
+                name: self.name,
+            })
+    }
+
+    pub fn type_name(&self) -> &'static str {
+        self.name
     }
 }
 
-pub trait Address<MB>
-where
-    MB: MessageBundle,
-{
-    fn send<M: Message>(&mut self, message: M);
+pub trait Address<MB> {
+    fn send<M: Message>(&mut self, message: M) -> impl Future<Output = anyhow::Result<M::Reply>>;
 }
 
 pub trait InternalMessageHandler {
     type HandledMessages: MessageBundle;
-    fn handle_message(&mut self, msg: InternalMessage);
+    fn handle_message(
+        &mut self,
+        msg: InternalMessage,
+    ) -> impl Future<Output = anyhow::Result<InternalMessage>>;
 }
 
 impl<MB, IMH> Address<MB> for IMH
@@ -45,14 +63,26 @@ where
     MB: MessageBundle,
     IMH: InternalMessageHandler<HandledMessages = MB>,
 {
-    fn send<M: Message>(&mut self, message: M) {
+    fn send<M: Message>(&mut self, message: M) -> impl Future<Output = anyhow::Result<M::Reply>> {
         const {
             let true = <M as IsContainedInBundle<MB>>::IS_CONTAINED else {
                 panic!("Message is not contained in MessageBundle",);
             };
         }
 
-        self.handle_message(InternalMessage(Box::new(message)));
+        let message = self.handle_message(InternalMessage::new(message));
+
+        async {
+            message.await.and_then(|msg| {
+                msg.into_inner::<M::Reply>().map_err(|e| {
+                    anyhow::anyhow!(
+                        "Expected a {}, but got a {}",
+                        std::any::type_name::<M::Reply>(),
+                        e.type_name()
+                    )
+                })
+            })
+        }
     }
 }
 
@@ -173,6 +203,9 @@ const fn remove_from_chain(prev: &'static BundleChain, to_remove: TypeId) -> Bun
 
 #[cfg(test)]
 mod tests {
+    use macro_rules_attribute::apply;
+    use smol_macros::test;
+
     use super::*;
 
     struct Foo;
@@ -218,18 +251,23 @@ mod tests {
         ));
     }
 
-    #[test]
-    fn check_sending_messages() {
+    #[apply(test!)]
+    async fn check_sending_messages() {
         struct Sender;
 
         impl InternalMessageHandler for Sender {
             type HandledMessages = (Foo, Bar);
 
-            fn handle_message(&mut self, _msg: InternalMessage) {}
+            async fn handle_message(
+                &mut self,
+                _msg: InternalMessage,
+            ) -> anyhow::Result<InternalMessage> {
+                Err(anyhow::anyhow!("Not implemented!"))
+            }
         }
 
         let mut s = Sender;
 
-        s.send(Foo);
+        s.send(Foo).await.unwrap_err();
     }
 }