further advanced state api and stream checks

backend/cron/cron_state_checker.py

@@ -27,6 +27,7 @@ class StateChecker(Generic[T]):
     The determined state is stored "locally" in the state checker object and NOT reflected back to the checked objects!
     It can be retrieved by calling get_current_state.
     """
+
     def __init__(self, state_checker_func: Union[Callable, List[Callable]], type_to_check: T, type_name=None,
                  threads=NUM_THREADS):
         self.num_threads = threads
@@ -149,5 +150,16 @@ class StateChecker(Generic[T]):
         with self.update_state_lock:
             return copy.deepcopy(self.state_results)
 
+    def get_current_state_for_recorder_name(self, recorder_name: str):
+        return self.get_current_state().get(recorder_name, None)
 
-recorder_checker = StateChecker([check_capture_agent_state, ping_capture_agent], Recorder)
+    def get_current_state_for_recorder_id(self, recorder_id: int):
+        states = self.get_current_state()
+        for key in states:
+            state = states[key]
+            if state.get('id', None) == recorder_id:  # found!
+                return state
+        return None
+
+
+async_cron_recorder_checker = StateChecker([check_capture_agent_state, ping_capture_agent], Recorder)