server: Make servePlaceId into a list of IDs, servePlaceIds

server/src/project.rs

@@ -1,5 +1,5 @@
 use std::{
-    collections::HashMap,
+    collections::{HashMap, HashSet},
     fs,
     io,
     path::{Path, PathBuf},
@@ -78,6 +78,7 @@ struct SourceProject {
     name: String,
     tree: SourceProjectNode,
     serve_port: Option<u16>,
+    serve_place_ids: Option<HashSet<u64>>,
     serve_place_id: Option<u64>,
 }
 
@@ -89,7 +90,7 @@ impl SourceProject {
             name: self.name,
             tree,
             serve_port: self.serve_port,
-            serve_place_id: self.serve_place_id,
+            serve_place_ids: self.serve_place_ids,
             file_location: PathBuf::from(project_file_location),
         }
     }
@@ -174,7 +175,7 @@ pub struct Project {
     pub name: String,
     pub tree: ProjectNode,
     pub serve_port: Option<u16>,
-    pub serve_place_id: Option<u64>,
+    pub serve_place_ids: Option<HashSet<u64>>,
     pub file_location: PathBuf,
 }
 

server/src/web.rs

@@ -1,6 +1,6 @@
 use std::{
     borrow::Cow,
-    collections::HashMap,
+    collections::{HashMap, HashSet},
     sync::{mpsc, Arc},
 };
 
@@ -26,6 +26,7 @@ pub struct ServerInfoResponse<'a> {
     pub session_id: SessionId,
     pub server_version: &'a str,
     pub protocol_version: u64,
+    pub expected_place_ids: Option<HashSet<u64>>,
     pub root_instance_id: RbxId,
     pub instance_metadata_map: Cow<'a, HashMap<RbxId, InstanceProjectNodeMetadata>>,
 }
@@ -78,6 +79,7 @@ impl Server {
                     server_version: self.server_version,
                     protocol_version: 2,
                     session_id: self.session.session_id,
+                    expected_place_ids: self.session.project.serve_place_ids.clone(),
                     root_instance_id: tree.get_root_id(),
                     instance_metadata_map: Cow::Borrowed(rbx_session.get_instance_metadata_map()),
                 })