Reset metadata watchers when refreshing workspaces

Author: code-asher

src/workspacesProvider.ts

@@ -13,7 +13,7 @@ export enum WorkspaceQuery {
 
 export class WorkspaceProvider implements vscode.TreeDataProvider<vscode.TreeItem> {
   private workspaces: WorkspaceTreeItem[] = []
-  private agentMetadata: Record<WorkspaceAgent["id"], AgentMetadataEvent[]> = {}
+  private agentWatchers: Record<WorkspaceAgent["id"], { dispose: () => void, metadata?: AgentMetadataEvent[] }> = {}
 
   constructor(private readonly getWorkspacesQuery: WorkspaceQuery, private readonly storage: Storage) {
     this.fetchAndRefresh()
@@ -22,6 +22,7 @@ export class WorkspaceProvider implements vscode.TreeDataProvider<vscode.TreeIte
   // fetchAndRefrehsh fetches new workspaces then re-renders the entire tree.
   async fetchAndRefresh() {
     const workspacesTreeItem: WorkspaceTreeItem[] = []
+    Object.values(this.agentWatchers).forEach((watcher) => watcher.dispose())
     // If the URL is set then we are logged in.
     if (this.storage.getURL()) {
       const resp = await getWorkspaces({ q: this.getWorkspacesQuery })
@@ -62,7 +63,7 @@ export class WorkspaceProvider implements vscode.TreeDataProvider<vscode.TreeIte
         )
         return Promise.resolve(agentTreeItems)
       } else if (element instanceof AgentTreeItem) {
-        const savedMetadata = this.agentMetadata[element.agent.id] || []
+        const savedMetadata = this.agentWatchers[element.agent.id]?.metadata || []
         return Promise.resolve(savedMetadata.map((metadata) => new AgentMetadataTreeItem(metadata)))
       }
 
@@ -71,6 +72,8 @@ export class WorkspaceProvider implements vscode.TreeDataProvider<vscode.TreeIte
     return Promise.resolve(this.workspaces)
   }
 
+  // monitorMetadata opens a web socket to monitor metadata on the specified
+  // agent and registers a disposer that can be used to stop the watch.
   async monitorMetadata(agentId: WorkspaceAgent["id"]): Promise<void> {
     const agentMetadataURL = new URL(`${this.storage.getURL()}/api/v2/workspaceagents/${agentId}/watch-metadata`)
     const agentMetadataEventSource = new EventSource(agentMetadataURL.toString(), {
@@ -79,22 +82,29 @@ export class WorkspaceProvider implements vscode.TreeDataProvider<vscode.TreeIte
       },
     })
 
+    this.agentWatchers[agentId] = {
+      dispose: () => {
+        delete(this.agentWatchers[agentId])
+        agentMetadataEventSource.close()
+      },
+    }
+
     agentMetadataEventSource.addEventListener("data", (event) => {
       try {
         const dataEvent = JSON.parse(event.data)
         const agentMetadata = AgentMetadataEventSchemaArray.parse(dataEvent)
 
         if (agentMetadata.length === 0) {
-          agentMetadataEventSource.close()
+          this.agentWatchers[agentId].dispose()
         }
 
-        const savedMetadata = this.agentMetadata[agentId]
+        const savedMetadata = this.agentWatchers[agentId].metadata
         if (JSON.stringify(savedMetadata) !== JSON.stringify(agentMetadata)) {
-          this.agentMetadata[agentId] = agentMetadata // overwrite existing metadata
+          this.agentWatchers[agentId].metadata = agentMetadata // overwrite existing metadata
           this.refresh()
         }
       } catch (error) {
-        agentMetadataEventSource.close()
+        this.agentWatchers[agentId].dispose()
       }
     })
   }