Fix SSE cleanup and add prompt creation endpoint

- Fix SSE cancel handler to properly capture controller in closure
- Remove error JSON messages before WebSocket close (close reason is sufficient)
- Add POST /api/sessions/:sessionId/prompts endpoint for prompt creation
- Add SSE client cleanup on broadcast errors
- Add createPrompt and getSession imports
- Add prompt message type to ClientMessage for CLI prompt reporting
- Add prompt message handler in WebSocket to create and broadcast prompts

src/server.ts

@@ -3,11 +3,13 @@
 import type { ServerWebSocket } from "bun";
 import {
   appendOutput,
+  createPrompt,
   createSession,
   endSession,
   getActiveSessions,
   getDeviceBySecret,
   getPrompt,
+  getSession,
   initDb,
   respondToPrompt,
   updateLastSeen,
@@ -30,8 +32,9 @@ function broadcastSSE(event: SSEEvent): void {
     try {
       controller.enqueue(eventStr);
     } catch (error) {
-      // Client disconnected, will be cleaned up
+      // Client disconnected, clean up
       console.debug("SSE client write error:", error);
+      sseClients.delete(controller);
     }
   }
 }
@@ -59,16 +62,16 @@ const server = Bun.serve<SessionData>({
 
     // SSE endpoint for dashboard
     if (url.pathname === "/events") {
+      let ctrl: ReadableStreamDefaultController<string>;
       const stream = new ReadableStream<string>({
         start(controller) {
+          ctrl = controller;
           sseClients.add(controller);
           // Send initial headers
           controller.enqueue(": connected\n\n");
         },
         cancel() {
-          sseClients.delete(
-            this as unknown as ReadableStreamDefaultController<string>,
-          );
+          sseClients.delete(ctrl);
         },
       });
 
@@ -87,6 +90,41 @@ const server = Bun.serve<SessionData>({
       return Response.json(sessions);
     }
 
+    // Create prompt for a session
+    if (
+      url.pathname.match(/^\/api\/sessions\/\d+\/prompts$/) &&
+      req.method === "POST"
+    ) {
+      const parts = url.pathname.split("/");
+      const sessionId = Number.parseInt(parts[3] || "", 10);
+
+      if (Number.isNaN(sessionId)) {
+        return new Response("Invalid session ID", { status: 400 });
+      }
+
+      const session = getSession(sessionId);
+      if (!session) {
+        return new Response("Session not found", { status: 404 });
+      }
+
+      const body = (await req.json()) as { prompt_text?: unknown };
+      if (!body.prompt_text || typeof body.prompt_text !== "string") {
+        return new Response("Missing or invalid prompt_text", { status: 400 });
+      }
+
+      const prompt = createPrompt(sessionId, body.prompt_text);
+
+      // Broadcast to dashboards
+      broadcastSSE({
+        type: "prompt",
+        prompt_id: prompt.id,
+        session_id: sessionId,
+        prompt_text: prompt.prompt_text,
+      });
+
+      return Response.json(prompt);
+    }
+
     if (url.pathname.startsWith("/api/prompts/")) {
       const parts = url.pathname.split("/");
       const promptId = Number.parseInt(parts[3] || "", 10);
@@ -180,9 +218,6 @@ const server = Bun.serve<SessionData>({
         if (msg.type === "auth") {
           const device = getDeviceBySecret(msg.secret);
           if (!device) {
-            ws.send(
-              JSON.stringify({ type: "error", message: "Invalid secret" }),
-            );
             ws.close(1008, "Invalid secret");
             return;
           }
@@ -219,9 +254,7 @@ const server = Bun.serve<SessionData>({
 
         // All other messages require authentication
         if (!ws.data.sessionId) {
-          ws.send(
-            JSON.stringify({ type: "error", message: "Not authenticated" }),
-          );
+          ws.close(1008, "Not authenticated");
           return;
         }
 
@@ -236,6 +269,18 @@ const server = Bun.serve<SessionData>({
           return;
         }
 
+        // Handle prompt message
+        if (msg.type === "prompt") {
+          const prompt = createPrompt(msg.session_id, msg.prompt_text);
+          broadcastSSE({
+            type: "prompt",
+            prompt_id: prompt.id,
+            session_id: msg.session_id,
+            prompt_text: msg.prompt_text,
+          });
+          return;
+        }
+
         // Handle resize message
         if (msg.type === "resize") {
           // Store resize info if needed (not yet implemented)
@@ -265,9 +310,7 @@ const server = Bun.serve<SessionData>({
         }
       } catch (error) {
         console.error("WebSocket message error:", error);
-        ws.send(
-          JSON.stringify({ type: "error", message: "Invalid message format" }),
-        );
+        ws.close(1008, "Invalid message format");
       }
     },
 

src/types.ts

@@ -41,7 +41,8 @@ export type ClientMessage =
   | { type: "auth"; secret: string; cwd?: string; command?: string }
   | { type: "output"; data: string }
   | { type: "resize"; cols: number; rows: number }
-  | { type: "exit"; code: number };
+  | { type: "exit"; code: number }
+  | { type: "prompt"; session_id: number; prompt_text: string };
 
 export type ServerMessage =
   | { type: "input"; data: string }