TEMP

crates/collab/src/db/ids.rs

@@ -1,5 +1,5 @@
 use crate::Result;
-use rpc::proto;
+use rpc::{proto, ConnectionId};
 use sea_orm::{entity::prelude::*, DbErr};
 use serde::{Deserialize, Serialize};
 
@@ -267,3 +267,8 @@ impl Into<i32> for ChannelVisibility {
         proto.into()
     }
 }
+
+pub enum ProjectLocation {
+    Remote(ConnectionId),
+    Hosted(HostedProjectId),
+}

crates/collab/src/db/queries/projects.rs

@@ -912,12 +912,28 @@ impl Database {
     }
 
     /// Returns the host connection for a read-only request to join a shared project.
-    pub async fn host_for_read_only_project_request(
+    pub async fn location_for_read_only_project_request(
         &self,
         project_id: ProjectId,
         connection_id: ConnectionId,
-    ) -> Result<ConnectionId> {
-        let room_id = self.room_id_for_project(project_id).await?;
+    ) -> Result<ProjectLocation> {
+        let project = self
+            .transaction(|tx| async move {
+                Ok(project::Entity::find_by_id(project_id)
+                    .one(&*tx)
+                    .await?
+                    .ok_or_else(|| anyhow!("project {} not found", project_id))?)
+            })
+            .await?;
+
+        if let Some(hosted_project_id) = project.hosted_project_id {
+            return Ok(ProjectLocation::Hosted(hosted_project_id));
+        };
+
+        let Some(room_id) = project.room_id else {
+            return Err(anyhow!("project not in room"))?;
+        };
+
         self.room_transaction(room_id, |tx| async move {
             let current_participant = room_participant::Entity::find()
                 .filter(room_participant::Column::RoomId.eq(room_id))
@@ -943,7 +959,7 @@ impl Database {
                 .await?
                 .ok_or_else(|| anyhow!("failed to read project host"))?;
 
-            Ok(host.connection())
+            Ok(ProjectLocation::Remote(host.connection()))
         })
         .await
         .map(|guard| guard.into_inner())
@@ -1097,7 +1113,7 @@ impl Database {
                 .ok_or_else(|| anyhow!("project {} not found", project_id))?;
             Ok(project
                 .room_id
-                .ok_or_else(|| anyhow!("project not in room"))?)
+                .ok_or_else(|| anyhow!("project is not in a room"))?)
         })
         .await
     }

crates/collab/src/hosted.rs

@@ -0,0 +1,125 @@
+use anyhow::anyhow;
+use rpc::proto::{
+    self, create_buffer_for_peer, CreateBufferForPeer, EntityMessage, OpenBufferResponse,
+    RequestMessage,
+};
+use sea_orm::{ColumnTrait, Condition, EntityTrait, QueryFilter};
+
+use crate::db::{buffer, worktree_entry, HostedProjectId, ProjectId};
+use crate::rpc::{Response, Session};
+use crate::Result;
+
+pub(crate) trait ProjectRequest: EntityMessage + RequestMessage {
+    async fn handle_hosted_project_request(
+        self,
+        _hosted_project_id: HostedProjectId,
+        _response: Response<Self>,
+        _session: Session,
+    ) -> Result<()> {
+        Err(anyhow!("not supported for hosted projects"))?
+    }
+}
+impl ProjectRequest for proto::GetHover {}
+impl ProjectRequest for proto::GetDefinition {}
+impl ProjectRequest for proto::GetTypeDefinition {}
+impl ProjectRequest for proto::GetReferences {}
+impl ProjectRequest for proto::SearchProject {}
+impl ProjectRequest for proto::GetDocumentHighlights {}
+impl ProjectRequest for proto::GetProjectSymbols {}
+impl ProjectRequest for proto::OpenBufferForSymbol {}
+impl ProjectRequest for proto::OpenBufferById {}
+impl ProjectRequest for proto::SynchronizeBuffers {}
+impl ProjectRequest for proto::InlayHints {}
+
+impl ProjectRequest for proto::OpenBufferByPath {
+    async fn handle_hosted_project_request(
+        self,
+        _hosted_project_id: HostedProjectId,
+        response: Response<Self>,
+        session: Session,
+    ) -> Result<()> {
+        let project_id = ProjectId(self.project_id as i32);
+        let worktree_id = self.worktree_id as i32;
+        let path = self.path.clone();
+
+        let (entry, buffer) = session
+            .db()
+            .await
+            .transaction({
+                let path = &path;
+
+                move |tx| async move {
+                    let entry = worktree_entry::Entity::find()
+                        .filter(
+                            Condition::all()
+                                .add(worktree_entry::Column::ProjectId.eq(project_id))
+                                .add(worktree_entry::Column::WorktreeId.eq(worktree_id))
+                                .add(worktree_entry::Column::Path.eq(path.clone())),
+                        )
+                        .one(&*tx)
+                        .await?
+                        .ok_or_else(|| anyhow!("no such file"))?;
+
+                    /// TODO: use a different column here?
+                    let buffer = buffer::Entity::find_by_id(BufferId(entry.inode))
+                        .one(&*tx)
+                        .await?
+                        .ok_or_else(|| anyhow!("no such buffer"))?;
+
+                    Ok((entry, buffer))
+                }
+            })
+            .await?;
+
+        response.send(OpenBufferResponse {
+            buffer_id: entry.inode as u64,
+        })?;
+
+        session.peer.send(
+            session.connection_id,
+            CreateBufferForPeer {
+                project_id: project_id.to_proto(),
+                peer_id: None,
+                variant: Some(proto::create_buffer_for_peer::Variant::State(
+                    proto::BufferState {
+                        id: entry.inode as u64,
+                        file: Some(proto::File {
+                            worktree_id: entry.worktree_id as u64,
+                            entry_id: Some(entry.inode as u64),
+                            path,
+                            mtime: Some(proto::Timestamp {
+                                seconds: entry.mtime_seconds as u64,
+                                nanos: entry.mtime_nanos as u32,
+                            }),
+                            is_deleted: entry.is_deleted,
+                        }),
+                        base_text: "Hello world".to_string(),
+                        diff_base: Some("Hello world".to_string()),
+                        line_ending: proto::LineEnding::Unix.into(),
+                        saved_version: vec![],
+                        saved_version_fingerprint: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa".into(),
+                        saved_mtime: Some(proto::Timestamp {
+                            seconds: entry.mtime_seconds as u64,
+                            nanos: entry.mtime_nanos as u32,
+                        }),
+                    },
+                )),
+            },
+        )?;
+
+        session.peer.send(
+            session.connection_id,
+            CreateBufferForPeer {
+                project_id: project_id.to_proto(),
+                peer_id: None,
+                variant: Some(create_buffer_for_peer::Variant::Chunk(proto::BufferChunk {
+                    buffer_id: entry.inode as u64,
+                    operations: vec![],
+                    is_last: true,
+                })),
+            },
+        )?;
+
+        Ok(())
+    }
+}

crates/collab/src/lib.rs

@@ -3,6 +3,7 @@ pub mod auth;
 pub mod db;
 pub mod env;
 pub mod executor;
+pub mod hosted;
 pub mod rpc;
 
 #[cfg(test)]

crates/collab/src/rpc.rs

@@ -5,10 +5,11 @@ use crate::{
     db::{
         self, BufferId, ChannelId, ChannelRole, ChannelsForUser, CreatedChannelMessage, Database,
         InviteMemberResult, MembershipUpdated, MessageId, NotificationId, Project, ProjectId,
-        RemoveChannelMemberResult, ReplicaId, RespondToChannelInvite, RoomId, ServerId, User,
-        UserId,
+        ProjectLocation, RemoveChannelMemberResult, ReplicaId, RespondToChannelInvite, RoomId,
+        ServerId, User, UserId,
     },
     executor::Executor,
+    hosted::ProjectRequest,
     AppState, Error, Result,
 };
 use anyhow::anyhow;
@@ -75,17 +76,17 @@ const MESSAGE_COUNT_PER_PAGE: usize = 100;
 const MAX_MESSAGE_LEN: usize = 1024;
 const NOTIFICATION_COUNT_PER_PAGE: usize = 50;
 
-type MessageHandler =
+pub(crate) type MessageHandler =
     Box<dyn Send + Sync + Fn(Box<dyn AnyTypedEnvelope>, Session) -> BoxFuture<'static, ()>>;
 
-struct Response<R> {
+pub(crate) struct Response<R> {
     peer: Arc<Peer>,
     receipt: Receipt<R>,
     responded: Arc<AtomicBool>,
 }
 
 impl<R: RequestMessage> Response<R> {
-    fn send(self, payload: R::Response) -> Result<()> {
+    pub(crate) fn send(self, payload: R::Response) -> Result<()> {
         self.responded.store(true, SeqCst);
         self.peer.respond(self.receipt, payload)?;
         Ok(())
@@ -93,18 +94,18 @@ impl<R: RequestMessage> Response<R> {
 }
 
 #[derive(Clone)]
-struct Session {
-    user_id: UserId,
-    connection_id: ConnectionId,
-    db: Arc<tokio::sync::Mutex<DbHandle>>,
-    peer: Arc<Peer>,
-    connection_pool: Arc<parking_lot::Mutex<ConnectionPool>>,
-    live_kit_client: Option<Arc<dyn live_kit_server::api::Client>>,
+pub(crate) struct Session {
+    pub(crate) user_id: UserId,
+    pub(crate) connection_id: ConnectionId,
+    pub(crate) db: Arc<tokio::sync::Mutex<DbHandle>>,
+    pub(crate) peer: Arc<Peer>,
+    pub(crate) connection_pool: Arc<parking_lot::Mutex<ConnectionPool>>,
+    pub(crate) live_kit_client: Option<Arc<dyn live_kit_server::api::Client>>,
     _executor: Executor,
 }
 
 impl Session {
-    async fn db(&self) -> tokio::sync::MutexGuard<DbHandle> {
+    pub(crate) async fn db(&self) -> tokio::sync::MutexGuard<DbHandle> {
         #[cfg(test)]
         tokio::task::yield_now().await;
         let guard = self.db.lock().await;
@@ -113,7 +114,7 @@ impl Session {
         guard
     }
 
-    async fn connection_pool(&self) -> ConnectionPoolGuard<'_> {
+    pub(crate) async fn connection_pool(&self) -> ConnectionPoolGuard<'_> {
         #[cfg(test)]
         tokio::task::yield_now().await;
         let guard = self.connection_pool.lock();
@@ -133,7 +134,7 @@ impl fmt::Debug for Session {
     }
 }
 
-struct DbHandle(Arc<Database>);
+pub(crate) struct DbHandle(Arc<Database>);
 
 impl Deref for DbHandle {
     type Target = Database;
@@ -1933,20 +1934,30 @@ async fn forward_read_only_project_request<T>(
     session: Session,
 ) -> Result<()>
 where
-    T: EntityMessage + RequestMessage,
+    T: ProjectRequest,
 {
     let project_id = ProjectId::from_proto(request.remote_entity_id());
-    let host_connection_id = session
+    let location = session
         .db()
         .await
-        .host_for_read_only_project_request(project_id, session.connection_id)
+        .location_for_read_only_project_request(project_id, session.connection_id)
         .await?;
-    let payload = session
-        .peer
-        .forward_request(session.connection_id, host_connection_id, request)
-        .await?;
-    response.send(payload)?;
-    Ok(())
+
+    match location {
+        ProjectLocation::Remote(connection_id) => {
+            let payload = session
+                .peer
+                .forward_request(session.connection_id, connection_id, request)
+                .await?;
+            response.send(payload)?;
+            Ok(())
+        }
+        ProjectLocation::Hosted(hosted_project_id) => {
+            request
+                .handle_hosted_project_request(hosted_project_id, response, session)
+                .await
+        }
+    }
 }
 
 /// forward a project request to the host. These requests are disallowed

crates/project/src/project.rs

@@ -7839,10 +7839,13 @@ impl Project {
                     }
 
                     let buffer_id = BufferId::new(state.id)?;
-                    let buffer = cx.new_model(|_| {
-                        Buffer::from_proto(this.replica_id(), this.capability(), state, buffer_file)
-                            .unwrap()
-                    });
+                    let buffer = Buffer::from_proto(
+                        this.replica_id(),
+                        this.capability(),
+                        state,
+                        buffer_file,
+                    )?;
+                    let buffer = cx.new_model(|_| buffer);
                     this.incomplete_remote_buffers
                         .insert(buffer_id, Some(buffer));
                 }

crates/rpc/src/macros.rs

@@ -38,6 +38,10 @@ macro_rules! messages {
                     }
                 }
 
+                fn into_payload(self) -> envelope::Payload {
+                    envelope::Payload::$name(self)
+                }
+
                 fn from_envelope(envelope: Envelope) -> Option<Self> {
                     if let Some(envelope::Payload::$name(msg)) = envelope.payload {
                         Some(msg)

crates/rpc/src/proto.rs

@@ -28,6 +28,7 @@ pub trait EnvelopedMessage: Clone + Debug + Serialize + Sized + Send + Sync + 's
         responding_to: Option<u32>,
         original_sender_id: Option<PeerId>,
     ) -> Envelope;
+    fn into_payload(self) -> envelope::Payload;
     fn from_envelope(envelope: Envelope) -> Option<Self>;
 }