make kestrel a tak server, so that it can send and receive pois as cots data

server/api/live/webrtc/create-producer.post.js

@@ -1,6 +1,7 @@
 import { requireAuth } from '../../../utils/authHelpers.js'
 import { getLiveSession, updateLiveSession } from '../../../utils/liveSessions.js'
 import { getTransport, producers } from '../../../utils/mediasoup.js'
+import { acquire } from '../../../utils/asyncLock.js'
 
 export default defineEventHandler(async (event) => {
   const user = requireAuth(event)
@@ -11,33 +12,48 @@ export default defineEventHandler(async (event) => {
     throw createError({ statusCode: 400, message: 'sessionId, transportId, kind, and rtpParameters required' })
   }
 
-  const session = getLiveSession(sessionId)
-  if (!session) {
-    throw createError({ statusCode: 404, message: 'Session not found' })
-  }
-  if (session.userId !== user.id) {
-    throw createError({ statusCode: 403, message: 'Forbidden' })
-  }
+  return await acquire(`create-producer-${sessionId}`, async () => {
+    const session = getLiveSession(sessionId)
+    if (!session) {
+      throw createError({ statusCode: 404, message: 'Session not found' })
+    }
+    if (session.userId !== user.id) {
+      throw createError({ statusCode: 403, message: 'Forbidden' })
+    }
 
-  const transport = getTransport(transportId)
-  if (!transport) {
-    throw createError({ statusCode: 404, message: 'Transport not found' })
-  }
+    const transport = getTransport(transportId)
+    if (!transport) {
+      throw createError({ statusCode: 404, message: 'Transport not found' })
+    }
 
-  const producer = await transport.produce({ kind, rtpParameters })
-  producers.set(producer.id, producer)
-  producer.on('close', () => {
-    producers.delete(producer.id)
-    const s = getLiveSession(sessionId)
-    if (s && s.producerId === producer.id) {
-      updateLiveSession(sessionId, { producerId: null })
+    const producer = await transport.produce({ kind, rtpParameters })
+    producers.set(producer.id, producer)
+    producer.on('close', async () => {
+      producers.delete(producer.id)
+      const s = getLiveSession(sessionId)
+      if (s && s.producerId === producer.id) {
+        try {
+          await updateLiveSession(sessionId, { producerId: null })
+        }
+        catch {
+          // Ignore errors during cleanup
+        }
+      }
+    })
+
+    try {
+      await updateLiveSession(sessionId, { producerId: producer.id })
+    }
+    catch (err) {
+      if (err.message === 'Session not found') {
+        throw createError({ statusCode: 404, message: 'Session not found' })
+      }
+      throw err
+    }
+
+    return {
+      id: producer.id,
+      kind: producer.kind,
     }
   })
-
-  updateLiveSession(sessionId, { producerId: producer.id })
-
-  return {
-    id: producer.id,
-    kind: producer.kind,
-  }
 })