app_manager: prevent loading unnecessary RyuApps

don't load RyuApps which is just imported and not defined in the module.
for example, if we run the script "test.py" as shown below by

$ ryu run test.py

the past implementation loads and instantiates not only Test but also RyuApp
and DPSet. this patch fix this wrong behavior

test.py
===

from ryu.base.app_manager import RyuApp
from ryu.controller.dpset import DPSet

class Test(RyuApp):
    _CONTEXTS = {'dpset' : DPSet}

Signed-off-by: ISHIDA Wataru <ishida.wataru@lab.ntt.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

1 files changed, 6 insertions, 2 deletions

diff --git a/ryu/base/app_manager.py b/ryu/base/app_manager.py
index 695c401e..357d34d6 100644
--- a/ryu/base/app_manager.py
+++ b/ryu/base/app_manager.py
@@ -27,6 +27,7 @@ import inspect
 import itertools
 import logging
 import sys
+import os
 
 from ryu import cfg
 from ryu import utils
@@ -338,8 +339,11 @@ class AppManager(object):
 
     def load_app(self, name):
         mod = utils.import_module(name)
-        clses = inspect.getmembers(mod, lambda cls: (inspect.isclass(cls) and
-                                                     issubclass(cls, RyuApp)))
+        clses = inspect.getmembers(mod,
+                                   lambda cls: (inspect.isclass(cls) and
+                                                issubclass(cls, RyuApp) and
+                                                mod.__name__ ==
+                                                cls.__module__))
         if clses:
             return clses[0][1]
         return None