Webhook: Fix not listening to notifications when no broadcaster

packages/opal-server/opal_server/policy/watcher/task.py

@@ -38,21 +38,27 @@ async def _on_webhook(self, topic: Topic, data: Any):
     async def _listen_to_webhook_notifications(self):
         # Webhook api route can be hit randomly in all workers, so it publishes a message to the webhook topic.
         # This listener, running in the leader's context, would actually trigger the repo pull
+
+        async def _subscribe_internal():
+            logger.info(
+                "listening on webhook topic: '{topic}'",
+                topic=opal_server_config.POLICY_REPO_WEBHOOK_TOPIC,
+            )
+            await self._pubsub_endpoint.subscribe(
+                [opal_server_config.POLICY_REPO_WEBHOOK_TOPIC],
+                self._on_webhook,
+            )
+
         if self._pubsub_endpoint.broadcaster is not None:
             async with self._pubsub_endpoint.broadcaster.get_listening_context():
-                logger.info(
-                    "listening on webhook topic: '{topic}'",
-                    topic=opal_server_config.POLICY_REPO_WEBHOOK_TOPIC,
-                )
-
-                await self._pubsub_endpoint.subscribe(
-                    [opal_server_config.POLICY_REPO_WEBHOOK_TOPIC],
-                    self._on_webhook,
-                )
+                await _subscribe_internal()
                 await self._pubsub_endpoint.broadcaster.get_reader_task()
 
                 # Stop the watcher if broadcaster disconnects
                 self.signal_stop()
+        else:
+            # If no broadcaster is configured, just subscribe, no need to wait on anything
+            await _subscribe_internal()
 
     async def start(self):
         """starts the policy watcher and registers a failure callback to