[web client] small fix + move "_knows_hostname" to be a static_method

tomwer/web/client.py

 # coding: utf-8
-#/*##########################################################################
+# /*##########################################################################
 # Copyright (C) 2016 European Synchrotron Radiation Facility
 #
 # Permission is hereby granted, free of charge, to any person obtaining a copy
@@ -30,7 +30,6 @@ __authors__ = ["H.Payno"]
 __license__ = "MIT"
 __date__ = "28/04/2017"
 
-
 import graypy
 from .config import grayport_port, grayport_host
 import os
@@ -39,9 +38,11 @@ import logging
 
 _logger = logging.getLogger(__file__)
 
+global _INFO_UNKNOWN_HOST_NAME
 _INFO_UNKNOWN_HOST_NAME = False
 """Cache variable to avoid several log about this information"""
 
+
 class OWClient(object):
     """Orange widget Client can emit information about his advancement
     """
@@ -51,19 +52,22 @@ class OWClient(object):
 
     def __init__(self, loggers):
         assert loggers is not None
-        if self._knows_hostname(hostname=grayport_host) is False:
+        if OWClient._knows_hostname(hostname=grayport_host) is False:
+            global _INFO_UNKNOWN_HOST_NAME
             if _INFO_UNKNOWN_HOST_NAME is False:
                 _logger.warning('unknow host %s' % grayport_host)
                 _INFO_UNKNOWN_HOST_NAME = True
             return
         if type(loggers) not in (list, tuple):
-            loggers = (loggers, )
+            loggers = (loggers,)
         for logger in loggers:
             if os.environ.get('ORANGE_WEB_LOG', 'True') is 'True':
                 try:
-                    self.graylogHandler = graypy.GELFHandler(grayport_host, grayport_port)
+                    self.graylogHandler = graypy.GELFHandler(grayport_host,
+                                                             grayport_port)
                 except:
-                    logger.error('Fail to create GELFHandler. Won\'t report log message')
+                    logger.error(
+                        'Fail to create GELFHandler. Won\'t report log message')
                 else:
                     logger.addHandler(self.graylogHandler)
                     logger.debug('- add graypy handler')
@@ -72,7 +76,8 @@ class OWClient(object):
                 info += 'ORANGE_WEB_LOG variable is setted to False'
                 logger.info(info)
 
-    def _knows_hostname(self, hostname):
+    @staticmethod
+    def _knows_hostname(hostname):
         try:
             socket.gethostbyname(hostname)
             return True