Merge 0a41cf2 into c5c508d

kytos/core/controller.py

@@ -85,7 +85,7 @@ def __init__(self, options=None, loop=None):
         #: dict: mapping of events and event listeners.
         #:
         #: The key of the dict is a KytosEvent (or a string that represent a
-        #: regex to match agains KytosEvents) and the value is a list of
+        #: regex to match against KytosEvents) and the value is a list of
         #: methods that will receive the referenced event
         self.events_listeners = {'kytos/core.connection.new':
                                  [self.new_connection]}
@@ -772,21 +772,25 @@ def load_napp(self, username, napp_name):
                            username, napp_name, err)
             return
         except FileNotFoundError as err:
-            msg = "NApp module not found, assuming it's a meta napp: %s"
+            msg = "NApp module not found, assuming it's a meta-napp: %s"
             self.log.warning(msg, err.filename)
             return
 
-        napp = napp_module.Main(controller=self)
-
-        self.napps[(username, napp_name)] = napp
+        try:
+            napp = napp_module.Main(controller=self)
+        except:
+            self.log.critical("NApp initialization failed: %s/%s",
+                              username, napp_name, exc_info=True)
+        else:
+            self.napps[(username, napp_name)] = napp
 
-        napp.start()
-        self.api_server.register_napp_endpoints(napp)
+            napp.start()
+            self.api_server.register_napp_endpoints(napp)
 
-        # pylint: disable=protected-access
-        for event, listeners in napp._listeners.items():
-            self.events_listeners.setdefault(event, []).extend(listeners)
-        # pylint: enable=protected-access
+            # pylint: disable=protected-access
+            for event, listeners in napp._listeners.items():
+                self.events_listeners.setdefault(event, []).extend(listeners)
+            # pylint: enable=protected-access
 
     def pre_install_napps(self, napps, enable=True):
         """Pre install and enable NApps.