ractor_cluster 0.16.5

Distributed cluster environment of Ractor actors
Documentation 
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// Copyright (c) Sean Lawlor
//
// This source code is licensed under both the MIT license found in the
// LICENSE-MIT file in the root directory of this source tree.

use super::*;

struct FakeNodeSession;

impl FakeNodeSession {
    async fn get_node_session() -> (ActorRef<crate::node::NodeSessionMessage>, JoinHandle<()>) {
        let (r, h) = Actor::spawn(None, FakeNodeSession, ())
            .await
            .expect("Failed to start fake node session");
        let cell: ractor::ActorCell = r.into();
        (cell.into(), h)
    }
}

#[cfg_attr(feature = "async-trait", ractor::async_trait)]
impl Actor for FakeNodeSession {
    type Msg = crate::node::NodeSessionMessage;
    type State = ();
    type Arguments = ();
    async fn pre_start(
        &self,
        _: ActorRef<Self::Msg>,
        _: Self::Arguments,
    ) -> Result<Self::State, ActorProcessingErr> {
        Ok(())
    }
}

#[ractor::concurrency::test]
async fn remote_actor_serialized_message_handling() {
    // setup
    let (actor, handle) = FakeNodeSession::get_node_session().await;
    let (remote_actor_ref, remote_actor_handle) = Actor::spawn(None, RemoteActor, actor.clone())
        .await
        .expect("Failed to spawn remote actor");

    let remote_actor_instance = RemoteActor;
    let mut remote_actor_state = RemoteActorState::new(actor.clone());

    // act & verify
    let bad_handler = remote_actor_instance
        .handle(
            remote_actor_ref.clone(),
            RemoteActorMessage,
            &mut remote_actor_state,
        )
        .await;
    assert!(bad_handler.is_err());

    let cast = SerializedMessage::Cast {
        variant: "A".to_string(),
        args: vec![1, 2, 3],
        metadata: None,
    };
    let cast_output = remote_actor_instance
        .handle_serialized(remote_actor_ref.clone(), cast, &mut remote_actor_state)
        .await;
    assert!(cast_output.is_ok());
    // cast's don't have pending requests
    assert_eq!(0, remote_actor_state.message_tag);

    let (tx, _rx) = ractor::concurrency::oneshot();
    let call = SerializedMessage::Call {
        variant: "B".to_string(),
        args: vec![1, 2, 3],
        reply: tx.into(),
        metadata: None,
    };
    let call_output = remote_actor_instance
        .handle_serialized(remote_actor_ref.clone(), call, &mut remote_actor_state)
        .await;
    assert!(call_output.is_ok());
    assert_eq!(1, remote_actor_state.message_tag);
    assert!(remote_actor_state.pending_requests.contains_key(&1));

    let reply = SerializedMessage::CallReply(1, vec![3, 4, 5]);
    let reply_output = remote_actor_instance
        .handle_serialized(remote_actor_ref.clone(), reply, &mut remote_actor_state)
        .await;
    assert!(reply_output.is_ok());
    assert!(!remote_actor_state.pending_requests.contains_key(&1));

    // cleanup
    remote_actor_ref.stop(None);
    actor.stop(None);
    remote_actor_handle.await.unwrap();
    handle.await.unwrap();
}

#[ractor::concurrency::test]
async fn abandoned_requests_are_reclaimed_incrementally() {
    let (session, session_handle) = FakeNodeSession::get_node_session().await;
    let (remote_actor, remote_actor_handle) = Actor::spawn(None, RemoteActor, session.clone())
        .await
        .unwrap();
    let mut state = RemoteActorState::new(session.clone());
    let (reply, receiver) = ractor::concurrency::oneshot::<Vec<u8>>();
    drop(receiver);

    RemoteActor
        .handle_serialized(
            remote_actor.clone(),
            SerializedMessage::Call {
                variant: "Call".to_string(),
                args: vec![],
                reply: reply.into(),
                metadata: None,
            },
            &mut state,
        )
        .await
        .unwrap();
    assert_eq!(state.pending_requests.len(), 1);

    RemoteActor
        .handle_serialized(
            remote_actor.clone(),
            SerializedMessage::Cast {
                variant: "Cast".to_string(),
                args: vec![],
                metadata: None,
            },
            &mut state,
        )
        .await
        .unwrap();
    assert!(state.pending_requests.is_empty());

    remote_actor.stop(None);
    session.stop(None);
    remote_actor_handle.await.unwrap();
    session_handle.await.unwrap();
}

#[ractor::concurrency::test]
async fn forwarding_failure_releases_the_reply_port() {
    let (session, session_handle) = FakeNodeSession::get_node_session().await;
    session.stop(None);
    session_handle.await.unwrap();

    let (remote_actor, remote_actor_handle) = Actor::spawn(None, RemoteActor, session.clone())
        .await
        .unwrap();
    let mut state = RemoteActorState::new(session);
    let (reply, receiver) = ractor::concurrency::oneshot::<Vec<u8>>();

    RemoteActor
        .handle_serialized(
            remote_actor.clone(),
            SerializedMessage::Call {
                variant: "Call".to_string(),
                args: vec![],
                reply: reply.into(),
                metadata: None,
            },
            &mut state,
        )
        .await
        .unwrap();

    assert!(state.pending_requests.is_empty());
    assert!(receiver.await.is_err());

    remote_actor.stop(None);
    remote_actor_handle.await.unwrap();
}