fix: correct Nats ObjectStorage get file behavior inside watch subscriber

faststream/nats/subscriber/usecase.py

@@ -1014,20 +1014,19 @@ async def _create_subscription(  # type: ignore[override]
             declare=self.obj_watch.declare,
         )
 
-        self.subscription = UnsubscribeAdapter["ObjectStore.ObjectWatcher"](
-            await self.bucket.watch(
-                ignore_deletes=self.obj_watch.ignore_deletes,
-                include_history=self.obj_watch.include_history,
-                meta_only=self.obj_watch.meta_only,
-            )
-        )
-
         self.add_task(self._consume_watch())
 
     async def _consume_watch(self) -> None:
-        assert self.subscription, "You should call `create_subscription` at first."  # nosec B101
+        assert self.bucket, "You should call `create_subscription` at first."  # nosec B101
+
+        # Should be created inside task to avoid nats-py lock
+        obj_watch = await self.bucket.watch(
+            ignore_deletes=self.obj_watch.ignore_deletes,
+            include_history=self.obj_watch.include_history,
+            meta_only=self.obj_watch.meta_only,
+        )
 
-        obj_watch = self.subscription.obj
+        self.subscription = UnsubscribeAdapter["ObjectStore.ObjectWatcher"](obj_watch)
 
         while self.running:
             with suppress(TimeoutError):

tests/docs/nats/js/test_object.py

@@ -9,23 +9,9 @@
 async def test_basic():
     from docs.docs_src.nats.js.object import app, broker, handler
 
-    async with TestNatsBroker(broker, with_real=True):
-        await broker.start()
-
-        os = await broker.object_storage("example-bucket")
-        try:
-            existed_files = await os.list()
-        except Exception:
-            existed_files = ()
-
-        call = True
-        for file in existed_files:
-            if file.name == "file.txt":
-                call = False
-
-        if call:
-            async with TestApp(app):
-                pass
-
+    async with (
+        TestNatsBroker(broker, with_real=True, connect_only=True),
+        TestApp(app),
+    ):
         await handler.wait_call(3.0)
         handler.mock.assert_called_once_with("file.txt")

tests/opentelemetry/nats/test_nats.py

@@ -48,7 +48,7 @@ async def test_batch(
         @broker.subscriber(
             queue,
             stream=stream,
-            pull_sub=PullSub(3, batch=True),
+            pull_sub=PullSub(3, batch=True, timeout=30.0),
             **self.subscriber_kwargs,
         )
         async def handler(m):