Using a single constant for DEFAULT_REDIS_QUEUE.

Also, catch `AttributeError` on `self._proc.terminate` in the
`HttpBackend`, since the process may already have been terminated and
set to null by another worker process.

platypush/app.py

@@ -25,9 +25,6 @@ log = logging.getLogger('platypush')
 class Application:
     """Main class for the Platypush application."""
 
-    # Default bus queue name
-    _default_redis_queue = 'platypush/bus'
-
     # Default Redis port
     _default_redis_port = 6379
 
@@ -90,7 +87,7 @@ class Application:
                 f.write(str(os.getpid()))
 
         self.bus: Optional[Bus] = None
-        self.redis_queue = redis_queue or self._default_redis_queue
+        self.redis_queue = redis_queue or RedisBus.DEFAULT_REDIS_QUEUE
         self.config_file = config_file
         self._verbose = verbose
         self._logsdir = (

platypush/backend/http/__init__.py

@@ -269,8 +269,12 @@ class HttpBackend(Backend):
                 self._workers.pop(i)
 
         if self._server_proc:
-            self._server_proc.terminate()
-            self._server_proc.join(timeout=5)
+            try:
+                self._server_proc.terminate()
+                self._server_proc.join(timeout=5)
+            except AttributeError:
+                pass
+
             self._server_proc = None
 
         if self._server_proc and self._server_proc.is_alive():

platypush/bus/redis.py

@@ -1,6 +1,6 @@
 import logging
 import threading
-from typing import Optional
+from typing import Final, Optional
 
 from platypush.bus import Bus
 from platypush.message import Message
@@ -13,7 +13,7 @@ class RedisBus(Bus):
     Overrides the in-process in-memory local bus with a Redis bus
     """
 
-    _DEFAULT_REDIS_QUEUE = 'platypush/bus'
+    DEFAULT_REDIS_QUEUE: Final[str] = 'platypush/bus'
 
     def __init__(self, *args, on_message=None, redis_queue=None, **kwargs):
         from platypush.utils import get_redis
@@ -21,7 +21,7 @@ class RedisBus(Bus):
         super().__init__(on_message=on_message)
         self.redis = get_redis(*args, **kwargs)
         self.redis_args = kwargs
-        self.redis_queue = redis_queue or self._DEFAULT_REDIS_QUEUE
+        self.redis_queue = redis_queue or self.DEFAULT_REDIS_QUEUE
         self.on_message = on_message
         self.thread_id = threading.get_ident()