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Don't panic when dropping a subscription in a subscription handler

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This commit is contained in:
Antonio Scandurra 2022-01-10 16:04:49 +01:00
parent 9f6c53b547
commit dff812b38e
1 changed files with 45 additions and 10 deletions
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55
crates/client/src/client.rs
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@ -125,7 +125,7 @@ struct ClientState {
entity_id_extractors: HashMap<TypeId, Box<dyn Send + Sync + Fn(&dyn AnyTypedEnvelope) -> u64>>,
model_handlers: HashMap<
(TypeId, u64),
Box<dyn Send + Sync + FnMut(Box<dyn AnyTypedEnvelope>, &mut AsyncAppContext)>,
Option<Box<dyn Send + Sync + FnMut(Box<dyn AnyTypedEnvelope>, &mut AsyncAppContext)>>,
>,
_maintain_connection: Option<Task<()>>,
heartbeat_interval: Duration,
@ -285,7 +285,7 @@ impl Client {
state.model_handlers.insert(
subscription_id,
Box::new(move |envelope, cx| {
Some(Box::new(move |envelope, cx| {
if let Some(model) = model.upgrade(cx) {
let envelope = envelope.into_any().downcast::<TypedEnvelope<T>>().unwrap();
model.update(cx, |model, cx| {
@ -294,7 +294,7 @@ impl Client {
}
});
}
}),
})),
);
Subscription {
@ -335,7 +335,7 @@ impl Client {
});
let prev_handler = state.model_handlers.insert(
subscription_id,
Box::new(move |envelope, cx| {
Some(Box::new(move |envelope, cx| {
if let Some(model) = model.upgrade(cx) {
let envelope = envelope.into_any().downcast::<TypedEnvelope<T>>().unwrap();
model.update(cx, |model, cx| {
@ -344,7 +344,7 @@ impl Client {
}
});
}
}),
})),
);
if prev_handler.is_some() {
panic!("registered a handler for the same entity twice")
@ -450,7 +450,8 @@ impl Client {
let payload_type_id = message.payload_type_id();
let entity_id = (extract_entity_id)(message.as_ref());
let handler_key = (payload_type_id, entity_id);
if let Some(mut handler) = state.model_handlers.remove(&handler_key) {
if let Some(handler) = state.model_handlers.get_mut(&handler_key) {
let mut handler = handler.take().unwrap();
drop(state); // Avoid deadlocks if the handler interacts with rpc::Client
let start_time = Instant::now();
log::info!("RPC client message {}", message.payload_type_name());
@ -459,10 +460,11 @@ impl Client {
"RPC message handled. duration:{:?}",
start_time.elapsed()
);
this.state
.write()
.model_handlers
.insert(handler_key, handler);
let mut state = this.state.write();
if state.model_handlers.contains_key(&handler_key) {
state.model_handlers.insert(handler_key, Some(handler));
}
} else {
log::info!("unhandled message {}", message.payload_type_name());
}
@ -813,4 +815,37 @@ mod tests {
);
assert_eq!(decode_worktree_url("not://the-right-format"), None);
}
#[gpui::test]
async fn test_dropping_subscription_in_handler(mut cx: TestAppContext) {
cx.foreground().forbid_parking();
let user_id = 5;
let mut client = Client::new(FakeHttpClient::with_404_response());
let server = FakeServer::for_client(user_id, &mut client, &cx).await;
let model = cx.add_model(|_| Model { subscription: None });
let (done_tx, mut done_rx) = postage::oneshot::channel();
let mut done_tx = Some(done_tx);
model.update(&mut cx, |model, cx| {
model.subscription = Some(client.subscribe(
cx,
move |model, _: TypedEnvelope<proto::Ping>, _, _| {
model.subscription.take();
postage::sink::Sink::try_send(&mut done_tx.take().unwrap(), ()).unwrap();
Ok(())
},
));
});
server.send(proto::Ping {}).await;
done_rx.recv().await.unwrap();
}
struct Model {
subscription: Option<Subscription>,
}
impl Entity for Model {
type Event = ();
}
}