refactor: new teardown worker method (#1820)

* refactor: new teardown worker method

* refactor: consistent worker_registration usage

* refactor: consistent utils import

rq/worker.py

@@ -28,7 +28,6 @@ import redis.exceptions
 
 from . import worker_registration
 from .command import parse_payload, PUBSUB_CHANNEL_TEMPLATE, handle_command
-from .utils import as_text
 from .connections import get_current_connection, push_connection, pop_connection
 
 from .defaults import (
@@ -48,9 +47,8 @@ from .registry import StartedJobRegistry, clean_registries
 from .scheduler import RQScheduler
 from .suspension import is_suspended
 from .timeouts import JobTimeoutException, HorseMonitorTimeoutException, UnixSignalDeathPenalty
-from .utils import backend_class, ensure_list, get_version, make_colorizer, utcformat, utcnow, utcparse, compact
+from .utils import backend_class, ensure_list, get_version, make_colorizer, utcformat, utcnow, utcparse, compact, as_text
 from .version import VERSION
-from .worker_registration import clean_worker_registry, get_keys
 from .serializers import resolve_serializer
 
 try:
@@ -132,7 +130,7 @@ class Worker:
         elif connection is None:
             connection = get_current_connection()
 
-        worker_keys = get_keys(queue=queue, connection=connection)
+        worker_keys = worker_registration.get_keys(queue=queue, connection=connection)
         workers = [
             cls.find_by_key(
                 key, connection=connection, job_class=job_class, queue_class=queue_class, serializer=serializer
@@ -152,7 +150,7 @@ class Worker:
         Returns:
             list_keys (List[str]): A list of worker keys
         """
-        return [as_text(key) for key in get_keys(queue=queue, connection=connection)]
+        return [as_text(key) for key in worker_registration.get_keys(queue=queue, connection=connection)]
 
     @classmethod
     def count(cls, connection: Optional['Redis'] = None, queue: Optional['Queue'] = None) -> int:
@@ -165,7 +163,7 @@ class Worker:
         Returns:
             length (int): The queue length.
         """
-        return len(get_keys(queue=queue, connection=connection))
+        return len(worker_registration.get_keys(queue=queue, connection=connection))
 
     @classmethod
     def find_by_key(
@@ -818,13 +816,15 @@ class Worker:
                     self.log.error('Worker %s: found an unhandled exception, quitting...', self.key, exc_info=True)
                     break
         finally:
+            self.teardown()
+        return bool(completed_jobs)
+
+    def teardown(self):
         if not self.is_horse:
             if self.scheduler:
                 self.stop_scheduler()
-
             self.register_death()
             self.unsubscribe()
-        return bool(completed_jobs)
 
     def stop_scheduler(self):
         """Ensure scheduler process is stopped
@@ -1471,7 +1471,7 @@ class Worker:
             if queue.acquire_cleaning_lock():
                 self.log.info('Cleaning registries for queue: %s', queue.name)
                 clean_registries(queue)
-                clean_worker_registry(queue)
+                worker_registration.clean_worker_registry(queue)
         self.last_cleaned_at = utcnow()
 
     @property