In my Zope 2.7 Product, I'm trying to implement a special folder, which intercepts the publishing call to any subobject and wraps the entire call in another.
A concrete example: where the default action would be to traverse /MyProduct/SpecialFolder/something, and publish the attr 'something' from SpecialFolder, I want this to happen instead:
doSomethingBeforeCallingTheRequestedObj()
try:
return mapply( something, blahblah...)
finally:
doSomethingAfterCallingTheRequestedObj()
Why? I need to do stuff to the REQUEST before the object is called (this part wasn't difficult), and then do something *after* it's called - no matter what the results were. But only for publishables that live in or beneath the Special Folder.
In fact I have something working, but one big problem - it breaks management screens in a bad way. The implementation is pasted below. Is there some much simpler way to accomplish this behavior? And am I short-circuiting security machinery in some dangerous way?
class Wrapper(Implicit):
"""voodoo"""
id = meta_type = title = "Wrapper"
def __init__(self, publishable):
self.pub = publishable
def index_html(self):
"""
render the results to the client
"""
REQUEST = self.REQUEST
print self.__class__.__name__, 'calling', self.pub
try:
return mapply(self.pub, REQUEST.args, REQUEST,
call_object,1,
missing_name,
dont_publish_class,
REQUEST, bind=1)
finally:
print self.__class__.__name__, 'done'
print ''
print ''
__call__ = index_html
Globals.InitializeClass(Wrapper)
class SpecialFolder(Folder):
def __bobo_traverse__ (self,REQUEST,key):
print '__bobo_traverse__', REQUEST.URL, key
stack = REQUEST['TraversalRequestNameStack']
target = getattr(self,key)
if stack: return target
return Wrapper(target).__of__(self)
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