Refactor supervisor logging logic to separate mixin

lib/tfw/components/process_managing_event_handler.py

@@ -4,14 +4,14 @@
 from xmlrpc.client import Fault as SupervisorFault
 
 from tfw import EventHandlerBase
-from tfw.mixins import SupervisorMixin
+from tfw.mixins import SupervisorMixin, SupervisorLogMixin
 from tfw.config.logs import logging
 from .directory_monitor import with_monitor_paused
 
 LOG = logging.getLogger(__name__)
 
 
-class ProcessManager(SupervisorMixin):
+class ProcessManager(SupervisorMixin, SupervisorLogMixin):
     def __init__(self):
         self.commands = {'start':      self.start_process,
                          'stop':       self.stop_process,

lib/tfw/mixins/__init__.py

@@ -1,7 +1,7 @@
 # Copyright (C) 2018 Avatao.com Innovative Learning Kft.
 # All Rights Reserved. See LICENSE file for details.
 
-from .supervisor_mixin import SupervisorMixin
+from .supervisor_mixin import SupervisorMixin, SupervisorLogMixin
 from .callback_mixin import CallbackMixin
 from .observer_mixin import ObserverMixin
 from .monitor_manager_mixin import MonitorManagerMixin

lib/tfw/mixins/supervisor_mixin.py

@@ -9,9 +9,11 @@ from os import remove
 from tfw.config import TFWENV
 
 
-class SupervisorMixin:
+class SupervisorBaseMixin:
     supervisor = xmlrpc.client.ServerProxy(TFWENV.SUPERVISOR_HTTP_URI).supervisor
 
+
+class SupervisorMixin(SupervisorBaseMixin):
     def stop_process(self, process_name):
         with suppress(SupervisorFault):
             self.supervisor.stopProcess(process_name)
@@ -19,6 +21,12 @@ class SupervisorMixin:
     def start_process(self, process_name):
         self.supervisor.startProcess(process_name)
 
+    def restart_process(self, process_name):
+        self.stop_process(process_name)
+        self.start_process(process_name)
+
+
+class SupervisorLogMixin(SupervisorBaseMixin):
     def read_log_stdout(self, process_name):
         return self._read_log_internal(self.supervisor.readProcessStdoutLog, process_name)
 
@@ -34,7 +42,3 @@ class SupervisorMixin:
         for logfile in ('stdout_logfile', 'stderr_logfile'):
             remove(self.supervisor.getProcessInfo(process_name)[logfile])
         self.supervisor.clearProcessLogs(process_name)
-
-    def restart_process(self, process_name):
-        self.stop_process(process_name)
-        self.start_process(process_name)