Graceful shutdown for modules and locale check for the server.

gns3server/modules/base.py

@@ -54,6 +54,7 @@ class IModule(multiprocessing.Process):
         self._current_session = None
         self._current_destination = None
         self._current_call_id = None
+        self._stopping = False
 
     def _setup(self):
         """
@@ -128,13 +129,16 @@ class IModule(multiprocessing.Process):
         except KeyboardInterrupt:
             return
 
+        log.info("{} module has stopped".format(self.name))
+
     def stop(self):
         """
         Stops the event loop.
         """
 
-        if self._ioloop:
-            self._ioloop.stop()
+        if not self._stopping:
+            self._stopping = True
+            self._ioloop.add_callback_from_signal(self._ioloop.stop)
 
     def send_response(self, results):
         """

gns3server/modules/iou/iou_device.py

@@ -442,8 +442,8 @@ class IOUDevice(object):
                 self._started = True
             except OSError as e:
                 iou_stdout = self.read_iou_stdout()
-                log.error("could not start IOU: {}\n{}".format(e, iou_stdout))
-                raise IOUError("could not start IOU: {}\n{}".format(e, iou_stdout))
+                log.error("could not start IOU {}: {}\n{}".format(self._path, e, iou_stdout))
+                raise IOUError("could not start IOU {}: {}\n{}".format(self._path, e, iou_stdout))
 
             # start console support
             self._start_ioucon()