Fix an infinite recursion error in PecanHook application.

Subclassing both `rest.RestController` and `hooks.HookController` results in an
infinite recursion error in hook application (which prevents your application
from starting).

Fixes bug 1357540

Change-Id: I6e26c6d8771b4b35943bfb85bf41e73d0982e74c

pecan/hooks.py

@@ -1,3 +1,4 @@
+import types
 import sys
 from inspect import getmembers
 
@@ -27,7 +28,15 @@ def walk_controller(root_class, controller, hooks):
                 for hook in hooks:
                     value._pecan.setdefault('hooks', set()).add(hook)
             elif hasattr(value, '__class__'):
-                if name.startswith('__') and name.endswith('__'):
+                # Skip non-exposed methods that are defined in parent classes;
+                # they're internal implementation details of that class, and
+                # not actual routable controllers, so we shouldn't bother
+                # assigning hooks to them.
+                if (
+                    isinstance(value, types.MethodType) and
+                    any(filter(lambda c: value.__func__ in c.__dict__.values(),
+                               value.im_class.mro()[1:]))
+                ):
                     continue
                 walk_controller(root_class, value, hooks)
 

pecan/tests/test_hooks.py

@@ -1656,3 +1656,43 @@ class TestRequestViewerHook(PecanTestCase):
         viewer = RequestViewerHook(conf)
 
         assert viewer.items == ['url']
+
+
+class TestRestControllerWithHooks(PecanTestCase):
+
+    def test_restcontroller_with_hooks(self):
+
+        class SomeHook(PecanHook):
+
+            def before(self, state):
+                state.response.headers['X-Testing'] = 'XYZ'
+
+        class BaseController(rest.RestController):
+
+            @expose()
+            def delete(self, _id):
+                return 'Deleting %s' % _id
+
+        class RootController(BaseController, HookController):
+
+            __hooks__ = [SomeHook()]
+
+            @expose()
+            def get_all(self):
+                return 'Hello, World!'
+
+        app = TestApp(
+            make_app(
+                RootController()
+            )
+        )
+
+        response = app.get('/')
+        assert response.status_int == 200
+        assert response.body == b_('Hello, World!')
+        assert response.headers['X-Testing'] == 'XYZ'
+
+        response = app.delete('/100/')
+        assert response.status_int == 200
+        assert response.body == b_('Deleting 100')
+        assert response.headers['X-Testing'] == 'XYZ'