Exception: message need '_' function

eventlet_backdoor.py
    loopingcall.py
    service.py

Change-Id: I41bf13a2c6afddbffe30ff36134c4a42eaa2ccf1

oslo_service/eventlet_backdoor.py

@@ -28,7 +28,7 @@ import traceback
 import eventlet.backdoor
 import greenlet
 
-from oslo_service._i18n import _LI
+from oslo_service._i18n import _LI, _
 from oslo_service import _options
 
 
@@ -37,8 +37,8 @@ LOG = logging.getLogger(__name__)
 
 class EventletBackdoorConfigValueError(Exception):
     def __init__(self, port_range, help_msg, ex):
-        msg = ('Invalid backdoor_port configuration %(range)s: %(ex)s. '
-               '%(help)s' %
+        msg = (_('Invalid backdoor_port configuration %(range)s: %(ex)s. '
+               '%(help)s') %
                {'range': port_range, 'ex': ex, 'help': help_msg})
         super(EventletBackdoorConfigValueError, self).__init__(msg)
         self.port_range = port_range
@@ -220,7 +220,7 @@ def _main():
 
     where_running_thread = _initialize_if_enabled(conf)
     if not where_running_thread:
-        raise RuntimeError("Did not create backdoor at requested location")
+        raise RuntimeError(_("Did not create backdoor at requested location"))
     else:
         _where_running, thread = where_running_thread
         thread.wait()

oslo_service/loopingcall.py

@@ -263,8 +263,8 @@ class BackOffLoopingCall(LoopingCallBase):
     """
 
     _RNG = random.SystemRandom()
-    _KIND = 'Dynamic backoff interval looping call'
-    _RUN_ONLY_ONE_MESSAGE = ("A dynamic backoff interval looping call can"
+    _KIND = _('Dynamic backoff interval looping call')
+    _RUN_ONLY_ONE_MESSAGE = _("A dynamic backoff interval looping call can"
                               " only run one function at a time")
 
     def __init__(self, f=None, *args, **kw):

oslo_service/service.py

@@ -35,7 +35,7 @@ from eventlet import event
 
 from oslo_concurrency import lockutils
 from oslo_service import eventlet_backdoor
-from oslo_service._i18n import _LE, _LI, _LW
+from oslo_service._i18n import _LE, _LI, _LW, _
 from oslo_service import _options
 from oslo_service import systemd
 from oslo_service import threadgroup
@@ -81,7 +81,7 @@ def _is_sighup_and_daemon(signo):
 
 def _check_service_base(service):
     if not isinstance(service, ServiceBase):
-        raise TypeError("Service %(service)s must an instance of %(base)s!"
+        raise TypeError(_("Service %(service)s must an instance of %(base)s!")
                         % {'service': service, 'base': ServiceBase})
 
 
@@ -696,7 +696,7 @@ def launch(conf, service, workers=1):
     """
 
     if workers is not None and workers <= 0:
-        raise ValueError("Number of workers should be positive!")
+        raise ValueError(_("Number of workers should be positive!"))
 
     if workers is None or workers == 1:
         launcher = ServiceLauncher(conf)