Send an event when rendering an exception view.

src/zope/errorview/http.py

@@ -15,6 +15,8 @@
 from zope.browser.interfaces import ISystemErrorView
 from zope.interface import implements
 from zope.publisher.interfaces.http import IHTTPException
+from zope.event import notify
+from zope.errorview.interfaces import HandleExceptionEvent
 
 
 class SystemErrorViewMixin(object):
@@ -40,6 +42,7 @@ def render(self):
         return u''
 
     def __call__(self):
+        notify(HandleExceptionEvent(self.request))
         self.update()
         return self.render()
 

src/zope/errorview/interfaces.py

@@ -0,0 +1,12 @@
+from zope.interface import Interface, implements, Attribute
+
+class IHandleExceptionEvent(Interface):
+    """Event fired when handling an exception."""
+
+    request = Attribute('The current request')
+
+class HandleExceptionEvent(object):
+    implements(IHandleExceptionEvent)
+
+    def __init__(self, request):
+        self.request = request

src/zope/errorview/tests/test_event.py

@@ -0,0 +1,33 @@
+##############################################################################
+#
+# Copyright (c) 2011 Zope Foundation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+
+from unittest import TestCase
+
+import zope.component.eventtesting
+from zope.publisher.http import HTTPRequest
+
+from zope.errorview.http import ExceptionViewBase
+from zope.errorview.interfaces import IHandleExceptionEvent
+
+
+class TestEvent(TestCase):
+    def setUp(self):
+        zope.component.eventtesting.setUp()
+        self.request = HTTPRequest('', {})
+
+    def test_event(self):
+        view = ExceptionViewBase(Exception(), self.request)()
+        event = zope.component.eventtesting.getEvents()[0]
+        self.assertEqual(event.request, self.request)
+        self.assertTrue(IHandleExceptionEvent.providedBy(event))