fix(sim): prevent duplicate stream start loops and noisy recording fallback errors

Backend/public/mobile-sim.js

@@ -186,6 +186,9 @@ let sfuSendTransport = null;
 let sfuRecvTransport = null;
 let sfuPublishedProducerId = null;
 let sfuConsumedTrack = null;
+let streamRequestInFlight = false;
+let hasAutoRequestedInitialStream = false;
+const inflightCameraStreamCommands = new Set();
 const rtcConfig = {
   iceServers: [{ urls: 'stun:stun.l.google.com:19302' }],
 };
@@ -914,7 +917,14 @@ const finalizeRecordingForStream = async (streamSessionId, captureResult) => {
     if (recording?.id) {
       try {
         if (!captureResult?.blob || captureResult.blob.size === 0) {
-          throw new Error('No captured video blob to upload');
+          const fallbackObjectKey = `sim/${streamSessionId}/${Date.now()}.webm`;
+          await API.events.finalizeRecording(recording.id, {
+            objectKey: fallbackObjectKey,
+            durationSeconds: captureResult?.durationSeconds ?? 15,
+            sizeBytes: captureResult?.blob?.size ?? 0,
+          });
+          addActivity('Recording', 'No local blob; finalized with simulator fallback');
+          return true;
         }
 
         const uploadMeta = await API.request('/videos/upload-url', {
@@ -998,11 +1008,26 @@ const connectSocket = () => {
     try {
       if (payload.commandType === 'start_stream') {
         const streamId = payload.payload.streamSessionId;
+        if (inflightCameraStreamCommands.has(streamId)) {
+          addActivity('Stream', `Duplicate start ignored for ${streamId.substring(0, 8)}`);
+          socket.emit('command:ack', { commandId: payload.commandId, status: 'acknowledged' });
+          return;
+        }
+        inflightCameraStreamCommands.add(streamId);
+
         const ready = await startCameraPreview();
         if (!ready) {
           throw new Error('Camera permission is required before streaming');
         }
+        try {
           await API.streams.accept(streamId);
+        } catch (error) {
+          const message = error?.message || '';
+          if (!message.includes('status 409')) {
+            throw error;
+          }
+          addActivity('Stream', 'Accept already handled, continuing publish setup');
+        }
         await API.streams.getPublishCreds(streamId);
         await startLocalRecording();
         if (isSfuMode()) {
@@ -1018,6 +1043,7 @@ const connectSocket = () => {
         addActivity('Stream', 'Accepted & Published');
         // Auto-stop after 15s for simulation
         setTimeout(async () => {
+          try {
             const captureResult = await stopLocalRecording();
             await API.streams.end(streamId);
             await finalizeRecordingForStream(streamId, captureResult);
@@ -1032,11 +1058,17 @@ const connectSocket = () => {
             teardownPeerConnection();
             store.update({ activeCameraDeviceId: null, activeStreamSessionId: null });
             addActivity('Stream', 'Ended auto-simulation');
+          } finally {
+            inflightCameraStreamCommands.delete(streamId);
+          }
         }, 15000);
       }
 
       socket.emit('command:ack', { commandId: payload.commandId, status: 'acknowledged' });
     } catch (e) {
+      if (payload?.payload?.streamSessionId) {
+        inflightCameraStreamCommands.delete(payload.payload.streamSessionId);
+      }
       socket.emit('command:ack', { commandId: payload.commandId, status: 'rejected', error: e.message });
     }
   });
@@ -1348,12 +1380,25 @@ const Actions = {
   },
 
   requestStream: async (camId) => {
+    if (streamRequestInFlight) {
+      return;
+    }
+    const current = store.get();
+    if (current.activeStreamSessionId) {
+      return;
+    }
+
+    streamRequestInFlight = true;
     try {
       store.update({ activeCameraDeviceId: camId });
       Toast.show('Requesting Stream...', 'info');
       await API.streams.request(camId);
       // Socket will handle the rest ('stream:started')
-    } catch (e) { }
+    } catch (e) {
+      store.update({ activeCameraDeviceId: null });
+    } finally {
+      streamRequestInFlight = false;
+    }
   },
 
   openRecording: async (recordingId) => {
@@ -1469,7 +1514,8 @@ const render = (state) => {
 
   // 5. Client Mode Lists
   if (state.device?.role === 'client' && state.screen === 'home') {
-    if (!state.activeCameraDeviceId && state.linkedCameras.length > 0) {
+    if (!hasAutoRequestedInitialStream && !state.activeCameraDeviceId && state.linkedCameras.length > 0 && !streamRequestInFlight) {
+      hasAutoRequestedInitialStream = true;
       void Actions.requestStream(state.linkedCameras[0].cameraDeviceId);
     }