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fix: try_recv() channel error : delta may be None

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basically if there was no change to report, the oneshot would not get
updated which is bad. so we put back the version we got and send a None
(the channel now has nullable TextChange). so basically its always a
try_recv, but its fine since recv is implemented with try_recv + poll
anyway
This commit is contained in:
əlemi 2024-08-17 00:17:01 +02:00
parent fdcfc611b1
commit 0154e5a032
Signed by: alemi
GPG key ID: A4895B84D311642C
2 changed files with 11 additions and 4 deletions
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6
src/buffer/controller.rs
View file

@ -15,6 +15,8 @@ use crate::api::TextChange;
use crate::ext::InternallyMutable;
use super::worker::DeltaRequest;
/// the buffer controller implementation
///
/// for each controller a worker exists, managing outgoing and inbound
@ -52,7 +54,7 @@ pub(crate) struct BufferControllerInner {
pub(crate) poller: mpsc::UnboundedSender<oneshot::Sender<()>>,
pub(crate) stopper: mpsc::UnboundedSender<()>, // just exist
pub(crate) content_request: mpsc::Sender<oneshot::Sender<String>>,
pub(crate) delta_request: mpsc::Sender<(LocalVersion, oneshot::Sender<(LocalVersion, TextChange)>)>,
pub(crate) delta_request: mpsc::Sender<DeltaRequest>,
pub(crate) callback: watch::Sender<Option<ControllerCallback<BufferController>>>,
}
@ -85,7 +87,7 @@ impl Controller<TextChange> for BufferController {
self.0.delta_request.send((last_update, tx)).await?;
let (v, change) = rx.await?;
self.0.last_update.set(v);
Ok(Some(change))
Ok(change)
}
/// enqueue a text change for processing

9
src/buffer/worker.rs
View file

@ -14,6 +14,9 @@ use codemp_proto::buffer::{BufferEvent, Operation};
use super::controller::{BufferController, BufferControllerInner};
pub(crate) type DeltaOp = (LocalVersion, Option<TextChange>);
pub(crate) type DeltaRequest = (LocalVersion, oneshot::Sender<DeltaOp>);
pub(crate) struct BufferWorker {
user_id: Uuid,
latest_version: watch::Sender<diamond_types::LocalVersion>,
@ -21,7 +24,7 @@ pub(crate) struct BufferWorker {
poller: mpsc::UnboundedReceiver<oneshot::Sender<()>>,
pollers: Vec<oneshot::Sender<()>>,
content_checkout: mpsc::Receiver<oneshot::Sender<String>>,
delta_req: mpsc::Receiver<(LocalVersion, oneshot::Sender<(LocalVersion, TextChange)>)>,
delta_req: mpsc::Receiver<DeltaRequest>,
stop: mpsc::UnboundedReceiver<()>,
controller: BufferController,
callback: watch::Receiver<Option<ControllerCallback<BufferController>>>,
@ -181,7 +184,9 @@ impl ControllerWorker<TextChange> for BufferWorker {
}
}
};
tx.send((new_local_v, tc)).unwrap_or_warn("could not update ops channel -- is controller dead?");
tx.send((new_local_v, Some(tc))).unwrap_or_warn("could not update ops channel -- is controller dead?");
} else {
tx.send((last_ver, None)).unwrap_or_warn("could not update ops channel -- is controller dead?");
}
},
},