endr 0.8.0

endr: append-only replicated objects
Documentation 
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use std::time::Duration;

use futures::{future, FutureExt, StreamExt};
use mofo::Mofo;
use endr::{Node, ObjectState, Remote, MemoryStorageBackend};

macro_rules! timeout {
    ($f:expr) => {
        tokio::time::timeout(Duration::from_millis(100), $f).map(|r| r.expect("Timed out"))
    };
}

async fn connect_nodes<'a>(node1: &'a Node, node1_name: &str, node2: &'a Node, node2_name: &str) {
    let (node1_as_remote, node2_as_remote) =
        Remote::new_connected_test_pair(node1_name, node2_name);

    node1.add_remote(node2_as_remote).await;
    node2.add_remote(node1_as_remote).await;
}

#[tokio::test]
async fn if_remote_is_sync_everything_it_will_receive_log_updates_and_get_local_notifications() {
    let background = Mofo::new();
    let node1 = Node::new(background.clone(), MemoryStorageBackend::new());
    let node2 = Node::new(background.clone(), MemoryStorageBackend::new());

    background
        .run_until(async {
            let (id, write_access) = node1.create_log::<()>(None).await;

            connect_nodes(&node1, "node1", &node2, "node2").await;

            let node2_diffs = node2.diffs(id, "node2_listener".to_owned());

            node1.append_to_log(id, &write_access, litl::Val::number(1.0)).await;

            let diff = timeout!(node2_diffs
                .filter(|diff| future::ready(!diff.expect_log().new_entries.is_empty()))
                .next())
            .await
            .unwrap();
            assert_eq!(diff.expect_log().after, 0);
            assert_eq!(diff.expect_log().new_entries, vec![litl::Val::number(1.0)]);

            match &*node2.load_object(id).await.borrow() {
                ObjectState::Log(log) => {
                    assert_eq!(log.entries, vec![litl::Val::number(1.0)]);
                }
                _ => panic!("Expected a log"),
            }
        })
        .await;
}

#[tokio::test]
async fn if_remote_is_sync_everything_it_will_receive_log_initial_states_as_local_notifications() {
    let background = Mofo::new();
    let node1 = Node::new(background.clone(), MemoryStorageBackend::new());
    let node2 = Node::new(background.clone(), MemoryStorageBackend::new());

    background
        .run_until(async {
            let (id, write_access) = node1.create_log::<()>(None).await;

            node1.append_to_log(id, &write_access, litl::Val::number(1.0)).await;

            connect_nodes(&node1, "node1", &node2, "node2").await;

            let node2_diffs = node2.diffs(id, "node2_listener".to_owned());

            let diff = timeout!(node2_diffs
                .filter(|diff| future::ready(!diff.expect_log().new_entries.is_empty()))
                .next())
            .await
            .unwrap();

            assert_eq!(diff.expect_log().after, 0);
            assert_eq!(diff.expect_log().new_entries, vec![litl::Val::number(1.0)]);

            match &*node2.load_object(id).await.borrow() {
                ObjectState::Log(log) => {
                    assert_eq!(log.entries, vec![litl::Val::number(1.0)]);
                }
                _ => panic!("Expected a log"),
            }
        })
        .await;
}

#[tokio::test]
async fn log_appends_propagate_to_other_clients_with_shared_sync_everything() {
    let background = Mofo::new();

    let client1 = Node::new(background.clone(), MemoryStorageBackend::new());
    let server = Node::new(background.clone(), MemoryStorageBackend::new());
    let client2 = Node::new(background.clone(), MemoryStorageBackend::new());

    background
        .run_until(async {
            let (id, write_access) = client1.create_log::<()>(None).await;

            connect_nodes(&client1, "client1", &server, "server").await;
            connect_nodes(&client2, "client2", &server, "server").await;

            let client2_diffs = client2.diffs(id, "client2_listener".to_owned());

            client1.append_to_log(id, &write_access, litl::Val::number(1.0)).await;

            let diff = timeout!(client2_diffs
                .filter(|diff| future::ready(!diff.expect_log().new_entries.is_empty()))
                .next())
            .await
            .unwrap();

            assert_eq!(diff.expect_log().after, 0);
            assert_eq!(diff.expect_log().new_entries, vec![litl::Val::number(1.0)]);

            match &*client2.load_object(id).await.borrow() {
                ObjectState::Log(log) => {
                    assert_eq!(log.entries, vec![litl::Val::number(1.0)]);
                }
                _ => panic!("Expected a log"),
            }
        })
        .await
}

// TODO: unsure if this is testing correctly - are things really happening in the order they appear in the code?
// the select at the end makes me think otherwise
#[tokio::test]
async fn log_appends_dont_propagate_to_clients_that_dont_care_about_them() {
    let background = Mofo::new();

    let client1 = Node::new(background.clone(), MemoryStorageBackend::new());
    let server = Node::new(background.clone(), MemoryStorageBackend::new());
    let client2 = Node::new(background.clone(), MemoryStorageBackend::new());

    background
        .run_until(async {
            let (id, write_access) = client1.create_log::<()>(None).await;

            connect_nodes(&client1, "client1", &server, "server").await;
            connect_nodes(&client2, "client2", &server, "server").await;

            let server_diffs = server.diffs(id, "server_listener".to_owned());

            client1.append_to_log(id, &write_access, litl::Val::number(1.0)).await;

            let diff = timeout!(server_diffs
                .filter(|diff| future::ready(!diff.expect_log().new_entries.is_empty()))
                .next())
            .await
            .unwrap();

            assert_eq!(diff.expect_log().after, 0);
            assert_eq!(diff.expect_log().new_entries, vec![litl::Val::number(1.0)]);

            match &*server.get_object(&id).unwrap().borrow() {
                ObjectState::Log(log) => {
                    assert_eq!(log.entries, vec![litl::Val::number(1.0)]);
                }
                _ => panic!("Expected a log"),
            }

            tokio::time::sleep(Duration::from_millis(100)).await;
            assert!(client2.get_object(&id).is_none());
        })
        .await;
}